WO2020255737A1 - Catheter - Google Patents

Catheter Download PDF

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Publication number
WO2020255737A1
WO2020255737A1 PCT/JP2020/022152 JP2020022152W WO2020255737A1 WO 2020255737 A1 WO2020255737 A1 WO 2020255737A1 JP 2020022152 W JP2020022152 W JP 2020022152W WO 2020255737 A1 WO2020255737 A1 WO 2020255737A1
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WO
WIPO (PCT)
Prior art keywords
tubular member
reinforcing
distal
distal end
proximal end
Prior art date
Application number
PCT/JP2020/022152
Other languages
French (fr)
Japanese (ja)
Inventor
知也 加藤
Original Assignee
株式会社カネカ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社カネカ filed Critical 株式会社カネカ
Priority to CN202080044316.4A priority Critical patent/CN113993569A/en
Priority to JP2021527576A priority patent/JPWO2020255737A1/ja
Publication of WO2020255737A1 publication Critical patent/WO2020255737A1/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00Catheters; Hollow probes

Definitions

  • the present invention relates to a catheter having excellent safety.
  • Patent Document 1 includes a resin shaft composed of two sections, an distal shaft and a proximal shaft, and a part of the distal shaft includes a first lumen and a second lumen.
  • a medical catheter having a dual lumen structure is disclosed.
  • Patent Document 2 discloses a catheter having a shaft having a first lumen through which the first wire is passed and a second lumen through which the second wire having a bent portion at the tip is passed.
  • Patent Document 3 discloses a catheter having a first lumen and a second lumen, in which at least the second lumen is composed of an inner layer, a reinforcing layer, and an outer layer.
  • Patent Document 2 discloses a technique of preventing the tip bending wire from penetrating through the lumen by providing a reinforcing layer around the lumen. However, if the reinforcing layer is provided up to the tip of the shaft, the flexibility is lowered and the tip of the shaft may be easily caught on the inner wall of the blood vessel or the like.
  • Patent Document 3 discloses a catheter in which the lumen is composed of an inner layer, a reinforcing layer, and an outer layer, and removes the reinforcing layer located on the distal end side of the first X-ray opaque marker on the distal end side of the lumen. The process to do is disclosed. According to the catheter, since the extending portion from which the reinforcing layer is removed is made of resin, the tip portion is highly flexible and can be less likely to be caught by the inner wall of the blood vessel or the like.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a catheter having excellent safety when inserting a tip bending wire.
  • the catheter according to the present invention that has been able to solve the above problems has the following configuration.
  • the first tubular member extending in the longitudinal direction, having a distal end and a proximal end, and having a first tubular member into which a wire is inserted, and a distal end and a proximal end. It is provided with a member and a second tubular member adjacent in the radial direction.
  • the distal end of the first tubular member is located proximal to the distal end of the second tubular member.
  • the proximal end of the first tubular member is located proximal to the proximal end of the second tubular member.
  • the first tubular member has a reinforcing portion having an inner layer containing at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer and a reinforcing member.
  • the first tubular member is made of a resin that does not contain the polytetrafluoroethylene, the tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and the reinforcing member on the distal side of the distal end of the reinforcing portion. Catheter with an extension of.
  • the inner layer of the reinforcing portion is made of a resin containing a polymer such as polytetrafluoroethylene or a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, while the extending portion is made of a resin not containing these polymers.
  • the catheter according to the present invention preferably includes the following configurations [2] to [16].
  • [2] The axial length from the distal end of the reinforcing portion of the first tubular member to the distal end of the extending portion is at least four times the inner diameter at the distal end of the reinforcing portion, 35.
  • the extending portion of the first tubular member has an opening on the distal side, and the opening has a tapered portion having a tapered surface and an outer surface [1] to [6].
  • the catheter according to any of. [8] The catheter according to [7], wherein the first tubular member has a raised portion that is distal to the opening and is raised toward the side opposite to the second tubular member.
  • the second tubular member is described in any one of [1] to [8] in which an X-ray opaque marker is arranged at a position distal to the distal end of the reinforcing portion. Catheter.
  • an X-ray opaque marker is arranged at a position distal to the distal end of the reinforcing portion, and the X-ray opaque marker is extended.
  • a second outer tubular member having a longitudinal direction is provided on the proximal side of the proximal end of the second tubular member. The catheter according to any one of [1] to [10], wherein the first tubular member is arranged in the lumen of the second outer tubular member.
  • FIG. 1 is a side view of the catheter according to the embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the region R1 of FIG. 1 in the axial direction.
  • FIG. 3 is an enlarged view of the region R3 of FIG.
  • FIG. 4 is a cross-sectional view showing another embodiment of FIG.
  • FIG. 5 is a sectional view taken along line VV of FIG.
  • FIG. 6 is a cross-sectional view showing another embodiment of FIG.
  • FIG. 7 is a partially enlarged view of a cross section of the region R2 in FIG. 1 in the axial direction.
  • the catheter of the present invention has a first tubular member extending in the longitudinal direction, having a distal end and a proximal end, into which a wire is inserted, and a distal end and a proximal end, the above-mentioned first.
  • a tubular member and a second tubular member adjacent in the radial direction are provided, and the distal end of the first tubular member is located proximal to the distal end of the second tubular member.
  • the proximal end of the first tubular member is located proximal to the proximal end of the second tubular member, and the first tubular member is polytetrafluoroethylene and tetrafluoroethylene par.
  • It has a reinforcing portion having an inner layer containing at least one selected from the group consisting of fluoroalkyl vinyl ether copolymers and a reinforcing member, and the first tubular member is distal to the distal end of the reinforcing portion.
  • a resin extending portion that does not include the polytetrafluoroethylene, the tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and the reinforcing member.
  • the present inventor has made it possible to improve safety when inserting a tip bending wire in a catheter having a resin extending portion having no reinforcing member on the distal side as disclosed in Patent Document 3. I examined it diligently. As a result, the inner layer of the reinforcing portion is made to contain at least one selected from the group consisting of polytetrafluoroethylene (PTFE) and tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), while the extending portion is included. It was found that the safety when inserting the tip bending wire can be improved by making the above content free of PTFE and PFA.
  • PTFE polytetrafluoroethylene
  • PFA perfluoroalkyl vinyl ether copolymer
  • the lumen of the extending portion not containing PTFE and PFA is larger than the lumen of the reinforcing portion containing PTFE and PFA. Friction resistance tends to be high.
  • the insertion speed is likely to be temporarily attenuated when the tip bending wire reaches the extending portion. It was found that it is possible to easily avoid damage to blood vessels and the like caused by pushing the tip bending wire too vigorously.
  • the extending portion does not contain the reinforcing member and PTFE and PFA, the flexibility is easily improved, so that the lumen of the extending portion can easily follow the shape of the tip bending wire, and the extending portion is extended by the tip bending wire. It was found that it can be easily prevented from breaking through the existing part.
  • FIG. 1 is a side view of the catheter according to the embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the region R1 of FIG. 1 in the axial direction.
  • FIG. 3 is an enlarged view of the region R3 of FIG.
  • FIG. 5 is a sectional view taken along line VV of FIG.
  • FIG. 7 is a partially enlarged view of a cross section of the region R2 in FIG. 1 in the axial direction.
  • the catheter 1 extends in the longitudinal direction X, has a distal end 10A and a proximal end 10B, and has a first tubular shape into which a wire is inserted.
  • the catheter 1 has a member 10, a distal end 20A, and a proximal end 20B, and includes a first tubular member 10 and a second tubular member 20 that is radially adjacent to each other.
  • the catheter 1 can be preferably used for the treatment of dilating a narrowing of a passage such as a blood vessel in the body or a occluded site, and is preferably used for performing coronary intervention (PCI) for a bifurcation lesion of a coronary arterial blood vessel. be able to.
  • PCI coronary intervention
  • a guide wire is inserted into the second tubular member 20 to extend the catheter 1 to the distal side of the bifurcation origin in the main blood vessel. Can be induced.
  • the tip bending wire 50 as shown in FIG. 1 can be inserted to the narrowed portion of the branch portion through the first tubular member 10 to search for the entrance of the narrowed portion or to penetrate the narrowed portion.
  • a guide wire is inserted into the second tubular member 20 to guide the catheter 1 into the bifurcation, while the tip bending wire 50 is passed through the first tubular member 10.
  • the first tubular member 10 shown in FIGS. 2 and 3 includes an inner layer 11 containing at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and a reinforcing member 12. It has a reinforcing portion 14 having and.
  • the inner layer 11 improves chemical resistance, non-adhesiveness, and low friction resistance by containing at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer. be able to.
  • the inner layer 11 contains at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer in a content of 60% by mass or more, assuming that the inner layer 11 is 100% by mass. It is more preferably 80% by mass or more, further preferably 90% by mass or more, still more preferably 95% by mass or more, and most preferably 100% by mass.
  • the inner layer 11 may contain at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and may further contain other resins.
  • Other resins include polyamide resins, polyester resins, polyurethane resins, polyolefin resins, and fluororesins other than polytetrafluoroethylene and tetrafluoroethylene / perfluoroalkyl vinyl ether copolymers (hereinafter, other fluororesins). (Sometimes referred to as a resin), vinyl chloride resin, silicone resin, and at least one selected from the group consisting of natural rubber.
  • At least one selected from the group consisting of polyolefin-based resins and other fluorine-based resins is preferable, and other fluorine-based resins are more preferable.
  • fluororesins include tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / ethylene copolymer, polyvinylidene fluoride, polychlorotrifluoroethylene, ethylene-chlorotrifluoroethylene copolymer and the like. .. These may be used alone or in combination of two or more.
  • the reinforcing member 12 is preferably a braided body in which the wire rod is braided, or a coil body in which the wire rod is spirally wound. This makes it easier to prevent the first tubular member 10 from being pierced by the tip bending wire 50 or the like. Of these, the reinforcing member 12 is more preferably a braided body because the braided body tends to improve the rigidity.
  • Examples of the wire material constituting the reinforcing member 12 include metal wire and fiber.
  • As the material constituting the metal wire for example, stainless steel, titanium, nickel-titanium alloy, cobalt-chromium alloy, tungsten alloy and the like are preferable. Of these, stainless steel is more preferable.
  • the metal wire may be a single wire or a stranded wire.
  • Examples of the fiber include polyarylate fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, PBO fiber, carbon fiber and the like.
  • the fibers may be monofilaments or multifilaments.
  • the reinforcing member 12 may contain an X-ray opaque substance in order to make it easier to confirm the position of the tubular member 10 under fluoroscopy or the like.
  • the X-ray impermeable substance is, for example, at least one selected from the group consisting of lead, barium, iodine, tungsten, gold, platinum, iridium, platinum iridium alloy, stainless steel, titanium, cobalt-chromium alloy, palladium, and tantalum. Seeds are mentioned.
  • the reinforcing portion 14 includes an inner layer 11 and a reinforcing member 12.
  • the reinforcing portion 14 preferably further includes an outer layer 13. It is more preferable that the reinforcing portion 14 is provided with the reinforcing member 12 between the inner layer 11 and the outer layer 13.
  • the outer layer 13 preferably contains at least one selected from the group consisting of low-density polyethylene, polyurethane, polyamide elastomer, and polyamide, and more preferably contains at least one selected from the group consisting of polyurethane and polyamide.
  • the first tubular member 10 includes a polytetrafluoroethylene, a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and a reinforcing member on the distal side of the distal end 14A of the reinforcing portion 14. It has an extending portion 15 made of resin that does not contain 12 and.
  • the extending portion 15 does not contain polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, the lumen of the extending portion 15 has more frictional resistance than the cavity of the inner layer 11 of the reinforcing portion 14. Is likely to be high. Therefore, when the tip bending wire 50 is inserted from the proximal side to the distal side of the catheter 1, the insertion speed is likely to be temporarily reduced when the tip bending wire 50 reaches the extending portion 15. As a result, it is possible to easily avoid damage to blood vessels and the like due to the tip bending wire caused by pushing the tip bending wire 50 too vigorously.
  • the flexibility of the extending portion 15 is easily improved, so that the lumen of the extending portion 15 can easily follow the shape of the tip bending wire 50, and as a result, the extending portion 15 by the tip bending wire 50 is easily improved. It can be easily prevented from breaking through. Further, by adjusting the pushing force when the practitioner senses that the tip of the tip bending wire 50 has reached the extending portion 15 due to the change in frictional resistance as described above, the tip bending wire extends. It can be easily prevented from breaking through the part.
  • the extending portion 15 does not contain polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer.
  • the resin constituting the extending portion 15 specifically, at least one selected from the group consisting of low-density polyethylene, polyurethane, polyamide elastomer, and polyamide is preferable, and at least one selected from the group consisting of polyurethane and polyamide is preferable. Is more preferable. Further, the extending portion 15 is preferably made of these resins.
  • the resin contained in the extending portion 15 and the resin contained in the outer layer 13 of the reinforcing portion 14 may be different, but it is preferable that they are the same because they are easily joined by heating and melting. Further, it is preferable that the extending portion 15 is joined to at least the outer layer 13 of the reinforcing portion 14 and the second tubular member 20.
  • the extending portion 15 does not include the reinforcing member 12, the flexibility is likely to be improved. Further, this makes it easy to form the tapered portion 15T as described later. Specifically, when the reinforcing member 12 is tapered, it is necessary to perform laser processing or the like on the cut portion so as not to damage the blood vessel after cutting the reinforcing member 12, but the reinforcing member 12 is included. By not having, such end processing can be omitted.
  • the axial length L from the distal end 14A of the reinforcing portion 14 of the first tubular member 10 to the distal end 15A of the extending portion 15 is the distal end 14A of the reinforcing portion 14.
  • the length is preferably 4 times or more and 35 times or less the inner diameter of the reinforcing portion 14.
  • the axial length L of the first tubular member 10 from the distal end 14A to the distal end 15A is extended by being four times or more the inner diameter of the reinforcing portion 14 at the distal end 14A.
  • the length L is 35 times or less the inner diameter of the reinforcing portion 14 at the distal end 14A, it is possible to easily avoid damage to the extending portion 15 by the tip bending wire 50. Therefore, it is more preferably 30 times or less, still more preferably 25 times or less.
  • the inner diameter of the reinforcing portion 14 at the distal end 14A of the reinforcing portion 14 is preferably 0.3 mm or more and 0.5 mm or less.
  • the distal end 15A of the extending portion 15 is preferably located proximal to the distal end 20A of the second tubular member 20. This makes it difficult for the distal end of the extending portion 15 to get caught in the inner wall of the blood vessel or the like.
  • the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 is preferably located proximal to the proximal end 20B of the second tubular member 20. Since the reinforcing portion 14 is present on the proximal side of the first tubular member 10 in this way, it is possible to easily prevent the tip bending wire 50 from penetrating the proximal side of the first tubular member 10. Further, it is more preferable that the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 is located in the cavity of the handle portion 70, which will be described later.
  • the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 is preferably located on the distal side of the proximal end 10B of the first tubular member 10. That is, by having the non-reinforcing portion 17 having no reinforcing member 12 at the proximal end portion 10b of the first tubular member 10, for example, in the manufacturing process, the lumen of the handle portion 70, which will be described later, and the first The non-reinforcing portion 17 can be processed into a shape that easily communicates with the lumen of the tubular member 10.
  • the catheter 1 further includes a first outer tubular member 100 having a longitudinal direction X, and a first tubular member 10 and a first tubular member 10 in the lumen of the first outer tubular member 100. It is preferable that the two tubular members 20 are arranged. As a result, it is possible to easily prevent the first tubular member 10 and the second tubular member 20 from being separated from each other.
  • FIG. 6 is a cross-sectional view showing another embodiment of FIG. As shown in FIG. 6, even if the outer surfaces of the first tubular member 10 and the second tubular member 20 are sealed by the resin columnar body 300 extending in the axial direction of the first tubular member 10. Good. This makes it easier to prevent the tip bending wire 50 from penetrating.
  • the first outer tubular member 100 preferably contains at least one selected from the group consisting of polyethylene, polyurethane, polyamide elastomer, and polyamide. Of these, at least one selected from the group consisting of polyurethane and polyamide is more preferable.
  • the columnar body 300 preferably contains at least one selected from the group consisting of polyethylene, polyurethane, polyamide elastomer, and polyamide. Of these, at least one selected from the group consisting of polyurethane and polyamide is more preferable.
  • the extending portion 15 of the first tubular member 10 has an opening 15O on the distal side, and the opening 15O has a tapered portion 15T having a tapered surface and an outer surface. Is preferable.
  • the tapered portion 15T that tapers toward the distal side makes it difficult for the distal end of the first tubular member 10 to get caught in the inner wall of the blood vessel or the like.
  • the tapered portion 15T may not be formed.
  • the tapered surface of the tapered portion 15T is preferably inclined at an angle of 5 ° or more and 85 ° or less with respect to the axial direction of the first tubular member 10.
  • the inclination angle is more preferably 60 ° or less, still more preferably 40 ° or less, and even more preferably 30 ° or less.
  • the inclination angle is more preferably 8 ° or more, still more preferably 10 ° or more.
  • FIG. 4 is a cross-sectional view showing another embodiment of FIG.
  • the first tubular member 10 has a raised portion 16 that is raised toward the side opposite to the second tubular member 20 on the distal side of the opening 15O. ..
  • the tip of the wire to be inserted into the first tubular member 10 can be guided in a direction different from the tip of the wire to be inserted into the second tubular member 20, so that treatment for a bifurcation lesion or the like can be facilitated. Can be done. Further, this makes it difficult for each wire to be entangled.
  • the alternate long and short dash line in FIGS. 3 and 4 indicates the traveling path of the wire.
  • the second tubular member 20 has an inner layer 11 and an outer layer 13. Further, it is more preferable that the reinforcing member 12 is not provided between the inner layer 11 and the outer layer 13. This makes it easier to improve the flexibility of the second tubular member 20.
  • a guide wire for guiding the catheter 1 to the vicinity of the lesion is preferably inserted into the second tubular member 20, but such a guide wire is more flexible than the tip bending wire 50 and is the second cylinder. Since the possibility of breaking through the shaped member 20 is extremely low, the second tubular member 20 does not have to include the reinforcing member 12.
  • the description of the outer layer 13 of the reinforcing portion 14 of the first tubular member 10 can be referred to.
  • the inner layer 11 of the second tubular member 20 is selected from the group consisting of a polyamide resin, a polyester resin, a polyurethane resin, a polyolefin resin, a fluorine resin, a vinyl chloride resin, a silicone resin, and a natural rubber. It is preferable to contain at least one kind. Of these, at least one selected from the group consisting of polyester-based resin, polyolefin-based resin, fluorine-based resin, silicone-based resin, and natural rubber is more preferable, and it is selected from the group consisting of polyolefin-based resin and fluorine-based resin. At least one is more preferred.
  • the polyolefin-based resin also includes polyethylene, and examples of the polyethylene include high-density polyethylene having a density of 942 kg / m 3 or more measured based on the provisions of JIS K6922-1.
  • the second tubular member 20 has a first X-ray opaque marker 31 and a second X-ray impermeable marker at positions distal to the distal end 14A of the reinforcing portion 14. It is preferable that an X-ray opaque marker such as the permeable marker 32 is arranged. As a result, it is possible to easily grasp the positions of the distal end 20A of the second tubular member, the opening 15O on the distal side of the first tubular member 10, and the like in the body.
  • the second tubular member 20 does not necessarily have to include both the first X-ray opaque marker 31 and the second X-ray opaque marker 32, and the first X-ray opaque marker 32 is not necessarily provided. Only the marker 31 may be provided, or only the second X-ray opaque marker 32 may be provided. Further, the second tubular member 20 may include other X-ray opaque markers in addition to the first X-ray opaque marker 31 and the second X-ray opaque marker 32.
  • the first X-ray opaque marker 31 is preferably located on the distal side of the distal end 15OA of the opening 15O on the distal side of the extending portion 15. This makes it easier to grasp the position of the distal end 20A of the second tubular member 20 in the body. Further, it is preferable that the second X-ray opaque marker 32 is also located on the proximal side of the proximal end 15OB of the opening 15O. This makes it easier to grasp the position of the opening 15O in the body.
  • FIG. 4 is a cross-sectional view showing another embodiment of FIG.
  • the first X-ray opaque marker 31 is located distal to the distal end 15OA of the distal opening 15O of the extension 15.
  • the second X-ray opaque marker 32 is preferably located proximal to the ridge 16. This makes it easier to accurately grasp the position of the opening 15O in the body.
  • the second tubular member 20 does not have an X-ray opaque marker arranged on the proximal side of the distal end 14A of the reinforcing portion 14. As a result, it is possible to easily improve the flexibility while reducing the outer diameter.
  • the X-ray opaque marker is not arranged on the extending portion 15 of the first tubular member 10.
  • the shape of the X-ray opaque marker is not particularly limited, and examples thereof include a band shape and a spiral shape.
  • Examples of the material constituting the X-ray opaque marker include the above-mentioned X-ray opaque substance.
  • the catheter 1 includes a second outer tubular member 200 having a longitudinal direction X on the proximal side of the proximal end 20B of the second tubular member 20, and the second outer cylinder. It is preferable that the first tubular member 10 is arranged in the cavity of the shaped member 200.
  • a second outer tubular member 200 that is, a so-called double pipe structure (coaxial structure), it is possible to improve the pushing force transmission property while protecting the first tubular member 10.
  • the second outer tubular member 200 preferably contains the same material as the first outer tubular member 100. Further, it is preferable that the distal end of the second outer tubular member 200 and the proximal end of the first outer tubular member 100 are integrated.
  • the outer surface of the first tubular member 10 is provided with a metal reinforcing wire 19 along the axial direction of the first tubular member 10.
  • the number of metal reinforcing wires 19 may be one or two or more. It is preferable that the metal reinforcing wire 19 exists at least from the distal side of the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 to the position of the proximal end 20B of the second tubular member 20.
  • the shape of the metal reinforcing wire 19 may be a barrel shape from the proximal side to the distal side, or a tapered shape that tapers toward the distal side. Examples of the material of the metal reinforcing wire 19 include stainless steel, nickel titanium, cobalt chrome and the like.
  • the first tubular member 10 preferably includes an outer layer 13. Specifically, it is preferable that at least the reinforcing portion 14 is provided with the outer layer 13. For details, refer to the description of the outer layer 13 of the reinforcing portion 14.
  • FIG. 7 is a partially enlarged view of a cross section of the first tubular member 10 in the region R2 of FIG. 1 in the axial direction, and the handle portion 70 will be described with reference to FIGS. 1 and 7.
  • the handle portion 70 has a first lumen 71 and a second lumen 72 proximal to the first lumen 71, and the proximal end 71B of the first lumen 71.
  • the inner diameter of the second lumen 72 is preferably larger than the inner diameter of the distal end 72A of the second lumen 72.
  • the non-reinforcing portion 17 is fixed to the first lumen 71 so that the proximal end 17B of the non-reinforcing portion 17 is located at the proximal end 71B of the first lumen 71.
  • the non-reinforcing portion 17 of the first tubular member 10 is arranged in the first lumen 71, and the second lumen 72 communicates with the non-reinforcing portion 17 and the lumen of the reinforcing portion 14. Is preferable.
  • the non-reinforcing portion 17 is a portion of the proximal end portion 10b of the first tubular member 10 that does not have the reinforcing member 12.
  • the non-reinforcing portion 17 preferably has a tapered portion 17T whose inner diameter increases toward the proximal side. If the tapered portion 17T is provided in this way, even if there is a step between the distal end of the tapered portion 17T and the proximal end 14B of the reinforcing portion 14, the tapered portion 17T allows the tip bending wire 50 to be formed. Since the tip is guided in the direction away from the step, it becomes difficult to get caught.
  • the inner wall of the tapered portion 17T of the non-reinforcing portion 17 is preferably inclined at an angle of 3 ° or more and 85 ° or less with respect to the axial direction of the first tubular member 10.
  • the inclination angle is 3 ° or more, for example, the bent portion of the tip bending wire 50 as shown in FIG. 1 is extended to some extent, so that the tip bending wire 50 is inserted into the cavity of the first tubular member 10. Can be easily inserted.
  • the inclination angle is 85 ° or less, it is possible to easily reduce the movement resistance of the wire due to contact with the inner wall of the tapered portion 17T. Therefore, the inclination angle is more preferably 70 ° or less, still more preferably 60 ° or less, even more preferably 50 ° or less, and particularly preferably 20 ° or less.
  • the catheter 1 is configured to satisfy the following equations (1) to (3) in order to facilitate insertion of the tip bending wire 50 from the second lumen 72 into the lumen of the first tubular member 10. It is preferable that it is.
  • a is an inner diameter (mm) at a position 14C 1 mm away from the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 on the distal side.
  • b is the inner diameter (mm) at the proximal end 17B of the non-reinforcing portion 17 of the first tubular member 10.
  • the inner diameter b (mm) at the proximal end 17B of the non-reinforcing portion 17 is larger than the inner diameter a (mm) at the position 14C 1 mm away from the proximal end 14B of the reinforcing portion 14 to the distal side. 17 is in a state of expanding in diameter toward the proximal side.
  • the inner diameter b is more preferably 1.1 times or more, still more preferably 1.2 times or more, still more preferably 1.3 times or more the inner diameter a.
  • the upper limit is not particularly limited, but for example, the inner diameter b may be 10 times or less, 5 times or less, or 2 times or less the inner diameter a.
  • the inner diameter a (mm) is preferably 0.1 mm or more and 0.8 mm or less, and more preferably 0.3 mm or more and 0.55 mm or less.
  • a is an inner diameter (mm) at a position 14C 1 mm away from the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 on the distal side.
  • c is the inner diameter (mm) at the distal end 72A of the second lumen 72 of the handle 70.
  • the inner diameter c (mm) at the distal end 72A of the second lumen 72 of the handle portion 70 is the inner diameter a at a position 14C distal to the proximal end 14B of the reinforcing portion 14 of the first tubular member 10.
  • the inner diameter c is more preferably 1.1 times or more, still more preferably 1.2 times or more, still more preferably 1.3 times or more the inner diameter a.
  • the upper limit is not particularly limited, but for example, the inner diameter c may be 5 times or less, 4 times or less, or 3 times or less the inner diameter a.
  • b is the inner diameter (mm) at the proximal end 17B of the non-reinforcing portion 17 of the first tubular member 10.
  • c is the inner diameter (mm) at the distal end 72A of the second lumen 72 of the handle 70.
  • the tip bending wire 50 is proximal because the inner diameter b (mm) at the proximal end 17B of the non-reinforcing portion 17 is equal to or greater than the inner diameter c (mm) at the distal end 72A of the second lumen 72 of the handle portion 70.
  • the inner diameter b is more preferably 1.1 times or more, still more preferably 1.2 times or more, still more preferably 1.3 times or more the inner diameter c.
  • the inner diameter b is 2.0 times or less the inner diameter c, it is difficult for the tip bending wire 50 to be caught by the distal end 72A of the second lumen 72 when the tip bending wire 50 is pulled back toward the proximal side. it can. Therefore, the inner diameter b is preferably 2.0 times or less, more preferably 1.7 times or less, still more preferably 1.5 times or less the inner diameter c.
  • the second lumen 72 of the handle portion 70 preferably has a tapered portion 72T whose diameter is reduced toward the distal side as shown in FIGS. 1 and 7.
  • the bent portion of the tip bending wire 50 is extended to some extent.
  • the tip bending wire 50 can be easily inserted into the cavity of the first tubular member 10.
  • the inner wall of the tapered portion 72T of the second lumen 72 of the handle portion 70 is inclined at an angle of 5 ° or more and 85 ° or less with respect to the axial direction of the first tubular member 10.
  • the inclination angle is 5 ° or more, the bent portion of the tip bending wire 50 can be easily extended to some extent.
  • the inclination angle is 85 ° or less, it is possible to easily reduce the movement resistance of the wire due to contact with the inner wall of the tapered portion 72T of the second lumen 72. Therefore, the inclination angle is more preferably 70 ° or less, still more preferably 60 ° or less, and even more preferably 50 ° or less.
  • the first lumen 71 of the handle portion 70 may have a stepped portion having a large diameter on the distal side.
  • the second outer tubular member 200 can be easily arranged in the first cavity 71.
  • the first lumen 71 may have a barrel shape having a diameter substantially constant in the longitudinal direction X.
  • the proximal end 200B of the second outer tubular member 200 is preferably located on the distal side of the proximal end 14B of the reinforcing portion 14.
  • the outer surface of the reinforcing portion 14 can also be fixed by the adhesive 73 or the like, and the fixing force can be easily improved.
  • An adhesive 73 or the like may be used to fix the proximal end 10b of the first tubular member 10 and the proximal end 200b of the second outer tubular member 200 into the first cavity 71.
  • the adhesive 73 is preferably at least one selected from the group consisting of cyanoacrylate adhesives, acrylic adhesives, epoxy adhesives, and urethane adhesives, and is preferably an acrylic adhesive and a urethane adhesive. More preferably, it is at least one selected from the group consisting of adhesives. Of these, urethane-based adhesives are even more preferably urethane-based adhesives because they are excellent in durability and adhesion to resins. Further, when the handle portion 70 is formed around the reinforcing portion 14 by injection molding, pressure is applied to the reinforcing portion 14 and the reinforcing portion 14 is easily damaged. However, the handle portion 70 is obtained by molding the reinforcing portion 70 in advance. By fixing the reinforcing portion 14 inside using an adhesive, it is possible to easily avoid damage due to the above pressure.
  • the outer layer 13 of the first tubular member 10 preferably contains fine particles in a portion fixed by an adhesive 73 or the like. As a result, minute irregularities are likely to be formed on the surface of the outer layer 13, and it is easy to be fixed by the adhesive 73 or the like.
  • the fine particles include pigments, and examples of the pigments include inorganic fine particles, organic fine particles, and synthetic inorganic pigments.
  • the major axis of the fine particles is preferably 0.1 ⁇ m or more, more preferably 0.5 ⁇ m or more, still more preferably 0.8 ⁇ m or more, preferably 50 ⁇ m or less, more preferably 10 ⁇ m or less, still more preferably 5 ⁇ m or less.
  • the outer layer 13 of the first tubular member 10 preferably contains a barium salt in a portion located in the first lumen 71.
  • a barium salt at least one selected from the group consisting of barium sulfate, barium carbonate, barium hydroxide, barium chloride, barium nitrate, and barium acetate is preferable, and barium sulfate is more preferable.
  • the second outer tubular member 200 preferably contains fine particles in a portion fixed by the adhesive 73 or the like.
  • the description of the outer layer 13 can be referred to.
  • the second outer tubular member 200 preferably contains a barium salt in a portion located in the first cavity 71.
  • a barium salt the description of the outer layer 13 can be referred to.
  • the handle portion 70 may be provided with a through hole 74 for fluid injection that communicates with the first lumen 71 from the outer surface of the handle portion 70.
  • a heated fluid or a bactericidal fluid can be injected into the lumen of the second outer tubular member 200 through the through hole 74 for sterilization.
  • the handle portion 70 may be provided with a through hole 75 for injecting an adhesive that communicates from the outer surface of the handle portion 70 to the first cavity 71.
  • the adhesive 73 can be injected from the outside to fix the non-reinforcing portion 17 and the like.
  • the outer surface of the second outer tubular member 200 may be fixed to the lumen of the first lumen 71 by the adhesive 73.
  • the proximal end of the second outer tubular member 200 is not sealed with the adhesive 73.
  • the second outer tubular member 200 does not necessarily have to be fixed in the first cavity 71 via the adhesive 73 as shown in FIG. 7.
  • the second outer tubular member 200 may be fixed outside the first lumen 71 by adhering the adhesive 73 to the outer surface of the distal end portion of the handle portion 70.
  • the outer shape of the handle portion 70 is preferably shaped so that the practitioner can grasp it with a finger.
  • the handle portion 70 is preferably a resin molded product obtained by injection molding or the like.
  • the resin include polyolefin-based resins such as polyethylene and polypropylene, polycarbonate-based resins, and (meth) acrylic-based resins. Of these resins, transparent resins such as polycarbonate and polymethyl methacrylate are preferable. As a result, the inside of the handle portion 70 can be easily seen, and the wire can be easily inserted.
  • the catheter 1 is a resin sleeve that covers the outer surface of the proximal end portion 14b of the reinforcing portion 14 and extends to the proximal side to form the tapered portion 17T of the non-reinforcing portion 17. It is preferable to provide 18.
  • the proximal end 14B of the reinforcing portion 14 is a portion where the reinforcing member 12 is easily deformed toward the outside, but the above deformation can be achieved by covering the proximal end portion 14b of the reinforcing portion 14 with a resin sleeve 18. It can be easily prevented.
  • the inner surface of the distal end portion of the sleeve 18 is joined to the outer surface of the proximal end portion 14b of the reinforcing portion 14 by heating and melting or the like.
  • the axial length from the proximal end 14B of the reinforcing portion 14 to the distal end 18A of the sleeve 18 (hereinafter, may be simply referred to as the covering length) is close to the reinforcing portion 14 of the first tubular member 10. It is preferably twice or more and 35 times or less the inner diameter a at the position 14C 1 mm away from the position end 14B on the distal side.
  • the coating length is more preferably 3 times or more the inner diameter a, and further preferably 4 times or more the inner diameter a.
  • the coating length is 35 times or less of the inner diameter a
  • the vicinity of the distal end 18A of the sleeve 18 is fixed in the first cavity 71 using, for example, an adhesive 73, the distal end 18A
  • the anchor effect is exerted and the durability against the force acting in the axial direction is easily improved. Therefore, the coating length is more preferably 28 times or less of the inner diameter a, further preferably 20 times or less of the inner diameter a, further preferably 15 times or less of the inner diameter a, and 10 times the inner diameter a.
  • the following is particularly preferable.
  • the sleeve 18 preferably contains a thermoplastic resin. It is more preferable that the thermoplastic resin contained in the sleeve 18 contains the same resin as the resin contained in the outer layer 13.
  • one end of a tubular body including a reinforcing member is covered with one end of a resin sleeve, and then a metal body having a tapered portion is heated.
  • a method of inserting a metal body from the other end of the sleeve toward one end can be mentioned.

Abstract

Provided is a catheter excellent in safety during insertion of a wire the tip end of which is bent. This catheter has: a first cylindrical member which extends in the longitudinal direction and has a distal end and a proximal end, and through which a wire is inserted; and a second cylindrical member adjacent to the first cylindrical member in the radial direction. The distal end of the first cylindrical member is located further to the proximal side than the distal end of the second cylindrical member. The proximal end of the first cylindrical member is located further to the proximal side than the proximal end of the second cylindrical member. The first cylindrical member has a reinforcing part having an inner layer and a reinforcing member, the inner layer containing at least one selected from the group consisting of polytetrafluoroethylene and tetrafluoroethylene-perfluoroalkyl vinyl ether copolymers. The first cylindrical member has an extension part located further to the distal side than the distal end of the reinforcing part, the extension part being made from a resin and not containing polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymers, and a reinforcing member.

Description

カテーテルcatheter
 本発明は、安全性に優れたカテーテルに関する。 The present invention relates to a catheter having excellent safety.
 人体の病変部を検査・処置するために血管等に挿入することが可能なカテーテルが用いられている。このようなカテーテルとして、例えば特許文献1には、先端側シャフトと基端側シャフトとの二つのセクションからなる樹脂製シャフトを備え、先端側シャフトの一部に、第一ルーメンと第二ルーメンとを有するデュアルルーメン構造をとっている医療用カテーテルが開示されている。 A catheter that can be inserted into a blood vessel or the like is used to inspect and treat a lesion in the human body. As such a catheter, for example, Patent Document 1 includes a resin shaft composed of two sections, an distal shaft and a proximal shaft, and a part of the distal shaft includes a first lumen and a second lumen. A medical catheter having a dual lumen structure is disclosed.
 更に特許文献2には、第1ワイヤーを通過させる第1ルーメンと、先端に屈曲部を有する第2ワイヤーを通過させる第2ルーメンとを有するシャフトを備えるカテーテルが開示されている。 Further, Patent Document 2 discloses a catheter having a shaft having a first lumen through which the first wire is passed and a second lumen through which the second wire having a bent portion at the tip is passed.
 また特許文献3には、第一ルーメンと第二ルーメンを有し、少なくとも該第二ルーメンが、内層、補強層、外層から構成されているカテーテルが開示されている。 Further, Patent Document 3 discloses a catheter having a first lumen and a second lumen, in which at least the second lumen is composed of an inner layer, a reinforcing layer, and an outer layer.
国際公開第2006/126642号International Publication No. 2006/126642 国際公開第2018/008272号International Publication No. 2018/008272 特開2009-82566号公報JP-A-2009-82566
 これまでにカテーテルに挿入されるワイヤとして、慢性完全閉塞病変等の患者における血管内の狭窄部の入り口等を探索したり、血管の選択やカテーテル遠位端の方向制御を行うために、先端部を予め折り曲げてアングル付けした先端屈曲ワイヤが使用される場合があった。このような先端屈曲ワイヤは先端荷重が高いため、例えば特許文献1に開示されている医療用カテーテルのルーメンに挿入すると先端屈曲ワイヤがルーメンを突き破ってしまい血管を損傷するおそれがあった。一方、特許文献2にはルーメンの周囲に補強層を設けることにより、先端屈曲ワイヤがルーメンを突き破って貫通することを抑制する技術が開示されている。しかし、シャフトの先端部にまで補強層を設けると柔軟性が低下して血管の内壁等にシャフトの先端が引っかかり易くなるおそれがあった。 As a wire to be inserted into a catheter so far, the tip is used to search for the entrance of a stenosis in a blood vessel in a patient with a chronic completely occluded lesion, etc. In some cases, a tip bending wire that was bent in advance and angled was used. Since such a tip bending wire has a high tip load, for example, when it is inserted into the lumen of a medical catheter disclosed in Patent Document 1, the tip bending wire may break through the lumen and damage a blood vessel. On the other hand, Patent Document 2 discloses a technique of preventing the tip bending wire from penetrating through the lumen by providing a reinforcing layer around the lumen. However, if the reinforcing layer is provided up to the tip of the shaft, the flexibility is lowered and the tip of the shaft may be easily caught on the inner wall of the blood vessel or the like.
 一方、特許文献3にはルーメンを内層、補強層、外層から構成するカテーテルが開示されており、ルーメンの先端側の第一X線不透過性マーカーよりも更に先端側に位置する補強層を除去する工程が開示されている。当該カテーテルによれば、補強層を除去した延在部は樹脂からなるため、先端部の柔軟性が高く血管の内壁等に引っかかり難くすることができる。 On the other hand, Patent Document 3 discloses a catheter in which the lumen is composed of an inner layer, a reinforcing layer, and an outer layer, and removes the reinforcing layer located on the distal end side of the first X-ray opaque marker on the distal end side of the lumen. The process to do is disclosed. According to the catheter, since the extending portion from which the reinforcing layer is removed is made of resin, the tip portion is highly flexible and can be less likely to be caught by the inner wall of the blood vessel or the like.
 上記の通り、これまでにワイヤ挿入時の安全性を向上するために様々な試みがなされているが、近年では更なる安全性の向上が求められている。 As mentioned above, various attempts have been made to improve the safety when inserting the wire, but in recent years, further improvement in safety has been required.
 本発明は上記事情に鑑みてなされたものであり、その目的は、先端屈曲ワイヤを挿入する際の安全性に優れたカテーテルを提供することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a catheter having excellent safety when inserting a tip bending wire.
 上記課題を解決することのできた本発明に係るカテーテルは、以下の構成からなる。
 [1]長手方向に延び、遠位端と近位端とを有しておりワイヤが挿入される第1筒状部材と、遠位端と近位端とを有し、上記第1筒状部材と径方向に隣接する第2筒状部材とを備え、
 上記第1筒状部材の遠位端は、上記第2筒状部材の遠位端よりも近位側に位置し、
 上記第1筒状部材の近位端は、上記第2筒状部材の近位端よりも近位側に位置し、
 上記第1筒状部材は、ポリテトラフルオロエチレン、及びテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体よりなる群から選択される少なくとも1種を含む内層と補強部材とを有する補強部を有し、
 上記第1筒状部材は、上記補強部の遠位端よりも遠位側には上記ポリテトラフルオロエチレンと上記テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体と上記補強部材とを含まない樹脂製の延在部を有するカテーテル。
The catheter according to the present invention that has been able to solve the above problems has the following configuration.
[1] The first tubular member extending in the longitudinal direction, having a distal end and a proximal end, and having a first tubular member into which a wire is inserted, and a distal end and a proximal end. It is provided with a member and a second tubular member adjacent in the radial direction.
The distal end of the first tubular member is located proximal to the distal end of the second tubular member.
The proximal end of the first tubular member is located proximal to the proximal end of the second tubular member.
The first tubular member has a reinforcing portion having an inner layer containing at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer and a reinforcing member.
The first tubular member is made of a resin that does not contain the polytetrafluoroethylene, the tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and the reinforcing member on the distal side of the distal end of the reinforcing portion. Catheter with an extension of.
 上記構成のうち特に、補強部の内層をポリテトラフルオロエチレンやテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体等の高分子を含むものとする一方で、延在部をこれらの高分子を含まない樹脂製のものとすることにより、先端屈曲ワイヤを挿入する際の安全性を向上できる。 Among the above configurations, the inner layer of the reinforcing portion is made of a resin containing a polymer such as polytetrafluoroethylene or a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, while the extending portion is made of a resin not containing these polymers. By using the above method, it is possible to improve the safety when inserting the tip bending wire.
 更に本発明に係るカテーテルには、好ましくは以下の[2]~[16]の構成も含まれる。
 [2]上記第1筒状部材の上記補強部の遠位端から上記延在部の遠位端までの軸方向の長さは、上記補強部の遠位端における内径の4倍以上、35倍以下の長さである[1]に記載のカテーテル。
 [3]上記第1筒状部材の上記補強部の近位端は、上記第2筒状部材の近位端よりも近位側に位置する[1]または[2]に記載のカテーテル。
 [4]上記第1筒状部材の上記補強部の近位端は、上記第1筒状部材の近位端よりも遠位側に位置する[1]~[3]のいずれかに記載のカテーテル。
 [5]更に長手方向を有する第1外側筒状部材を備え、上記第1外側筒状部材の内腔に上記第1筒状部材と上記第2筒状部材が配置されている[1]~[4]のいずれかに記載のカテーテル。
 [6]上記第1筒状部材と上記第2筒状部材の外側面は、軸方向に延びる樹脂製の円柱状体により封止されている[1]~[4]のいずれかに記載のカテーテル。
 [7]上記第1筒状部材の上記延在部は、遠位側に開口部を有し、上記開口部は、テーパ面と外側面とを備えるテーパ部を有する[1]~[6]のいずれかに記載のカテーテル。
 [8]上記第1筒状部材は、上記開口部よりも遠位側に、上記第2筒状部材とは反対側に向かって***している***部を有する[7]に記載のカテーテル。
 [9]上記第2筒状部材は、上記補強部の遠位端よりも遠位側の位置に、X線不透過性マーカーが配置されている[1]~[8]のいずれかに記載のカテーテル。
 [10]上記第2筒状部材は、上記補強部の遠位端よりも遠位側の位置に、X線不透過性マーカーが配置されており、上記X線不透過性マーカーは、上記延在部の遠位側の開口部の遠位端よりも遠位側に位置する[7]または[8]に記載のカテーテル。
 [11]更に上記第2筒状部材の近位端よりも近位側に、長手方向を有する第2外側筒状部材を備え、
 上記第2外側筒状部材の内腔に上記第1筒状部材が配置されている[1]~[10]のいずれかに記載のカテーテル。
 [12]上記第1筒状部材の外側面は、軸方向に沿って金属補強線を備える[1]~[11]のいずれかに記載のカテーテル。
 [13]上記第1筒状部材は、外層を備える[1]~[12]のいずれかに記載のカテーテル。
 [14]上記外層は、低密度ポリエチレン、ポリウレタン、ポリアミドエラストマー、及びポリアミドからなる群より選ばれる少なくとも1種を含む[13]に記載のカテーテル。
 [15]上記第1筒状部材の近位端部には、ハンドル部が接続されている[1]~[14]のいずれかに記載のカテーテル。
 [16]上記延在部を構成する樹脂は、低密度ポリエチレン、ポリウレタン、ポリアミドエラストマー、及びポリアミドからなる群より選ばれる少なくとも1種である[1]~[15]のいずれかに記載のカテーテル。
Further, the catheter according to the present invention preferably includes the following configurations [2] to [16].
[2] The axial length from the distal end of the reinforcing portion of the first tubular member to the distal end of the extending portion is at least four times the inner diameter at the distal end of the reinforcing portion, 35. The catheter according to [1], which has a length of twice or less.
[3] The catheter according to [1] or [2], wherein the proximal end of the reinforcing portion of the first tubular member is located proximal to the proximal end of the second tubular member.
[4] The method according to any one of [1] to [3], wherein the proximal end of the reinforcing portion of the first tubular member is located distal to the proximal end of the first tubular member. catheter.
[5] Further, a first outer tubular member having a longitudinal direction is provided, and the first tubular member and the second tubular member are arranged in the lumen of the first outer tubular member [1] to The catheter according to any one of [4].
[6] The method according to any one of [1] to [4], wherein the outer surfaces of the first tubular member and the second tubular member are sealed by a resin columnar body extending in the axial direction. catheter.
[7] The extending portion of the first tubular member has an opening on the distal side, and the opening has a tapered portion having a tapered surface and an outer surface [1] to [6]. The catheter according to any of.
[8] The catheter according to [7], wherein the first tubular member has a raised portion that is distal to the opening and is raised toward the side opposite to the second tubular member.
[9] The second tubular member is described in any one of [1] to [8] in which an X-ray opaque marker is arranged at a position distal to the distal end of the reinforcing portion. Catheter.
[10] In the second tubular member, an X-ray opaque marker is arranged at a position distal to the distal end of the reinforcing portion, and the X-ray opaque marker is extended. The catheter according to [7] or [8], which is located distal to the distal end of the distal opening of the location.
[11] Further, a second outer tubular member having a longitudinal direction is provided on the proximal side of the proximal end of the second tubular member.
The catheter according to any one of [1] to [10], wherein the first tubular member is arranged in the lumen of the second outer tubular member.
[12] The catheter according to any one of [1] to [11], wherein the outer surface of the first tubular member is provided with a metal reinforcing line along the axial direction.
[13] The catheter according to any one of [1] to [12], wherein the first tubular member includes an outer layer.
[14] The catheter according to [13], wherein the outer layer contains at least one selected from the group consisting of low-density polyethylene, polyurethane, polyamide elastomer, and polyamide.
[15] The catheter according to any one of [1] to [14], wherein a handle portion is connected to the proximal end portion of the first tubular member.
[16] The catheter according to any one of [1] to [15], wherein the resin constituting the extending portion is at least one selected from the group consisting of low-density polyethylene, polyurethane, polyamide elastomer, and polyamide.
 本発明によれば、上記構成により、先端屈曲ワイヤを挿入する際の安全性に優れたカテーテルを提供することができる。 According to the present invention, it is possible to provide a catheter having excellent safety when inserting the tip bending wire by the above configuration.
図1は、本発明の実施の形態に係るカテーテルの側面図である。FIG. 1 is a side view of the catheter according to the embodiment of the present invention. 図2は、図1の領域R1の軸方向の断面図である。FIG. 2 is a cross-sectional view of the region R1 of FIG. 1 in the axial direction. 図3は、図2の領域R3の拡大図である。FIG. 3 is an enlarged view of the region R3 of FIG. 図4は、図3の他の実施の形態を示す断面図である。FIG. 4 is a cross-sectional view showing another embodiment of FIG. 図5は、図2のV-V断面図である。FIG. 5 is a sectional view taken along line VV of FIG. 図6は、図5の他の実施の形態を示す断面図である。FIG. 6 is a cross-sectional view showing another embodiment of FIG. 図7は、図1の領域R2の軸方向の断面の一部拡大図である。FIG. 7 is a partially enlarged view of a cross section of the region R2 in FIG. 1 in the axial direction.
 以下では、下記実施の形態に基づき本発明をより具体的に説明するが、本発明はもとより下記実施の形態によって制限を受けるものではなく、前・後記の趣旨に適合し得る範囲で適当に変更を加えて実施することも勿論可能であり、それらはいずれも本発明の技術的範囲に包含される。なお、各図面において、便宜上、部材符号等を省略する場合もあるが、かかる場合、明細書や他の図面を参照するものとする。また、図面における種々部材の寸法は、本発明の特徴の理解に資することを優先しているため、実際の寸法とは異なる場合がある。 Hereinafter, the present invention will be described in more detail based on the following embodiments, but the present invention is not limited by the following embodiments as well as the present invention, and is appropriately modified to the extent that it can be adapted to the purpose of the above and the following. Of course, it is also possible to carry out the above, and all of them are included in the technical scope of the present invention. In each drawing, the member code and the like may be omitted for convenience, but in such a case, the specification and other drawings shall be referred to. In addition, the dimensions of various members in the drawings may differ from the actual dimensions because priority is given to contributing to the understanding of the features of the present invention.
 本発明のカテーテルは、長手方向に延び、遠位端と近位端とを有しておりワイヤが挿入される第1筒状部材と、遠位端と近位端とを有し、上記第1筒状部材と径方向に隣接する第2筒状部材とを備え、上記第1筒状部材の遠位端は、上記第2筒状部材の遠位端よりも近位側に位置し、上記第1筒状部材の近位端は、上記第2筒状部材の近位端よりも近位側に位置し、上記第1筒状部材は、ポリテトラフルオロエチレン、及びテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体よりなる群から選択される少なくとも1種を含む内層と補強部材とを有する補強部を有し、上記第1筒状部材は、上記補強部の遠位端よりも遠位側には上記ポリテトラフルオロエチレンと上記テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体と上記補強部材とを含まない樹脂製の延在部を有する。 The catheter of the present invention has a first tubular member extending in the longitudinal direction, having a distal end and a proximal end, into which a wire is inserted, and a distal end and a proximal end, the above-mentioned first. A tubular member and a second tubular member adjacent in the radial direction are provided, and the distal end of the first tubular member is located proximal to the distal end of the second tubular member. The proximal end of the first tubular member is located proximal to the proximal end of the second tubular member, and the first tubular member is polytetrafluoroethylene and tetrafluoroethylene par. It has a reinforcing portion having an inner layer containing at least one selected from the group consisting of fluoroalkyl vinyl ether copolymers and a reinforcing member, and the first tubular member is distal to the distal end of the reinforcing portion. On the side, there is a resin extending portion that does not include the polytetrafluoroethylene, the tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and the reinforcing member.
 本発明者は、特許文献3に開示されているような遠位側に補強部材を有さない樹脂製の延在部を有するカテーテルにおいて、先端屈曲ワイヤの挿入時の安全性を向上するために鋭意検討した。その結果、補強部の内層をポリテトラフルオロエチレン(PTFE)、及びテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体(PFA)よりなる群から選択される少なくとも1種を含むものとする一方で、延在部をPTFE、PFAを含有しないものとすることにより、先端屈曲ワイヤを挿入する際の安全性を向上できることが分かった。 The present inventor has made it possible to improve safety when inserting a tip bending wire in a catheter having a resin extending portion having no reinforcing member on the distal side as disclosed in Patent Document 3. I examined it diligently. As a result, the inner layer of the reinforcing portion is made to contain at least one selected from the group consisting of polytetrafluoroethylene (PTFE) and tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), while the extending portion is included. It was found that the safety when inserting the tip bending wire can be improved by making the above content free of PTFE and PFA.
 詳細には、上記PTFE、PFAを含有することにより摩擦抵抗が低くなる傾向があるため、PTFE、PFAを含有しない延在部の内腔は、PTFE、PFAを含有する補強部の内腔よりも摩擦抵抗が高くなり易い。その結果、先端屈曲ワイヤをカテーテルの近位側から遠位側に向かって挿入していく際に、延在部に先端屈曲ワイヤが到達した時点で一時的に挿入速度が減弱され易くなるため、先端屈曲ワイヤを勢いよく押し込み過ぎることに起因する血管等の損傷を回避し易くできることが分かった。 Specifically, since the frictional resistance tends to be lowered by containing the above-mentioned PTFE and PFA, the lumen of the extending portion not containing PTFE and PFA is larger than the lumen of the reinforcing portion containing PTFE and PFA. Friction resistance tends to be high. As a result, when the tip bending wire is inserted from the proximal side to the distal side of the catheter, the insertion speed is likely to be temporarily attenuated when the tip bending wire reaches the extending portion. It was found that it is possible to easily avoid damage to blood vessels and the like caused by pushing the tip bending wire too vigorously.
 また、延在部が補強部材とPTFE、PFAとを含有しないことにより柔軟性が向上し易くなるため、延在部の内腔が先端屈曲ワイヤの形状に追従し易くなり、先端屈曲ワイヤによる延在部の突き破りを防止し易くできることが分かった。 Further, since the extending portion does not contain the reinforcing member and PTFE and PFA, the flexibility is easily improved, so that the lumen of the extending portion can easily follow the shape of the tip bending wire, and the extending portion is extended by the tip bending wire. It was found that it can be easily prevented from breaking through the existing part.
 以下では図1~3、5、7を参照して、本発明の実施の形態に係るカテーテルについて説明する。図1は、本発明の実施の形態に係るカテーテルの側面図である。図2は、図1の領域R1の軸方向の断面図である。図3は、図2の領域R3の拡大図である。図5は、図2のV-V断面図である。図7は、図1の領域R2の軸方向の断面の一部拡大図である。 Hereinafter, the catheter according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3, 5 and 7. FIG. 1 is a side view of the catheter according to the embodiment of the present invention. FIG. 2 is a cross-sectional view of the region R1 of FIG. 1 in the axial direction. FIG. 3 is an enlarged view of the region R3 of FIG. FIG. 5 is a sectional view taken along line VV of FIG. FIG. 7 is a partially enlarged view of a cross section of the region R2 in FIG. 1 in the axial direction.
 本発明の実施の形態に係るカテーテル1は、図1~3に示す通り、長手方向Xに延び、遠位端10Aと近位端10Bとを有しておりワイヤが挿入される第1筒状部材10と、遠位端20Aと近位端20Bとを有し、第1筒状部材10と径方向に隣接する第2筒状部材20とを備えるカテーテル1である。 As shown in FIGS. 1 to 3, the catheter 1 according to the embodiment of the present invention extends in the longitudinal direction X, has a distal end 10A and a proximal end 10B, and has a first tubular shape into which a wire is inserted. The catheter 1 has a member 10, a distal end 20A, and a proximal end 20B, and includes a first tubular member 10 and a second tubular member 20 that is radially adjacent to each other.
 図1に示す通り、第1筒状部材10の遠位端10Aは、第2筒状部材20の遠位端20Aよりも近位側に位置し、第1筒状部材10の近位端10Bは、第2筒状部材20の近位端20Bよりも近位側に位置している。当該構成によりカテーテル1は、体内の血管等の通路の狭窄や閉塞部位を拡張する治療に好ましく用いることができ、冠状動脈血管の分岐部病変等に対する冠血管インターベンション(PCI)の施行により好ましく用いることができる。 As shown in FIG. 1, the distal end 10A of the first tubular member 10 is located proximal to the distal end 20A of the second tubular member 20, and the proximal end 10B of the first tubular member 10 Is located proximal to the proximal end 20B of the second tubular member 20. With this configuration, the catheter 1 can be preferably used for the treatment of dilating a narrowing of a passage such as a blood vessel in the body or a occluded site, and is preferably used for performing coronary intervention (PCI) for a bifurcation lesion of a coronary arterial blood vessel. be able to.
 詳細には、冠状動脈血管の分岐部に狭窄部がある場合、第2筒状部材20内にガイドワイヤを挿入して、血管本幹内の分岐起始部よりも遠位側までカテーテル1を誘導することができる。一方、第1筒状部材10を通じて図1に示すような先端屈曲ワイヤ50を分岐部の狭窄部まで挿入し、狭窄部の入り口を探索したり、狭窄部を貫通させることができる。 Specifically, when there is a stenosis at the bifurcation of the coronary blood vessel, a guide wire is inserted into the second tubular member 20 to extend the catheter 1 to the distal side of the bifurcation origin in the main blood vessel. Can be induced. On the other hand, the tip bending wire 50 as shown in FIG. 1 can be inserted to the narrowed portion of the branch portion through the first tubular member 10 to search for the entrance of the narrowed portion or to penetrate the narrowed portion.
 一方、血管本幹内に狭窄部がある場合、第2筒状部材20内にガイドワイヤを挿入して、分岐部内までカテーテル1を誘導する一方で、第1筒状部材10を通じて先端屈曲ワイヤ50を血管本幹内の狭窄部まで挿入し、狭窄部の入り口を探索したり、狭窄部を貫通させたりすることもできる。 On the other hand, when there is a stenosis in the main trunk of the blood vessel, a guide wire is inserted into the second tubular member 20 to guide the catheter 1 into the bifurcation, while the tip bending wire 50 is passed through the first tubular member 10. Can be inserted up to the stenosis in the main blood vessel to search for the entrance of the stenosis or to penetrate the stenosis.
 図2、3に示す第1筒状部材10は、ポリテトラフルオロエチレン、及びテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体よりなる群から選択される少なくとも1種を含む内層11と、補強部材12とを有する補強部14を有している。 The first tubular member 10 shown in FIGS. 2 and 3 includes an inner layer 11 containing at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and a reinforcing member 12. It has a reinforcing portion 14 having and.
 内層11は、ポリテトラフルオロエチレン、及びテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体よりなる群から選択される少なくとも1種を含むことにより、耐薬品性、非粘着性、低摩擦性を向上することができる。内層11は、内層11を100質量%としたとき、ポリテトラフルオロエチレン、及びテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体よりなる群から選択される少なくとも1種を60質量%以上の含量で含有することが好ましく、より好ましくは80質量%以上、更に好ましくは90質量%以上、更により好ましくは95質量%以上、最も好ましくは100質量%である。 The inner layer 11 improves chemical resistance, non-adhesiveness, and low friction resistance by containing at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer. be able to. The inner layer 11 contains at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer in a content of 60% by mass or more, assuming that the inner layer 11 is 100% by mass. It is more preferably 80% by mass or more, further preferably 90% by mass or more, still more preferably 95% by mass or more, and most preferably 100% by mass.
 内層11は、少なくともポリテトラフルオロエチレン、及びテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体よりなる群から選択される少なくとも1種を含んでいればよく、その他の樹脂を更に含んでいてもよい。その他の樹脂として、ポリアミド系樹脂、ポリエステル系樹脂、ポリウレタン系樹脂、ポリオレフィン系樹脂、ポリテトラフルオロエチレンとテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体以外のフッ素系樹脂(以下では、他のフッ素系樹脂と呼ぶ場合がある)、塩化ビニル系樹脂、シリコーン系樹脂、及び天然ゴムよりなる群から選択される少なくとも1種が挙げられる。このうちポリオレフィン系樹脂、及び他のフッ素系樹脂よりなる群から選択される少なくとも1種が好ましく、他のフッ素系樹脂がより好ましい。他のフッ素系樹脂として、テトラフルオロエチレン・ヘキサフルオロプロピレン共重合体、テトラフルオロエチレン・エチレン共重合体、ポリビニリデンフルオライド、ポリクロロトリフルオロエチレン、エチレン-クロロトリフロオロエチレンコポリマー等が挙げられる。これらは1種のみ用いてもよいし、2種以上組み合わせて用いてもよい。 The inner layer 11 may contain at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and may further contain other resins. Other resins include polyamide resins, polyester resins, polyurethane resins, polyolefin resins, and fluororesins other than polytetrafluoroethylene and tetrafluoroethylene / perfluoroalkyl vinyl ether copolymers (hereinafter, other fluororesins). (Sometimes referred to as a resin), vinyl chloride resin, silicone resin, and at least one selected from the group consisting of natural rubber. Of these, at least one selected from the group consisting of polyolefin-based resins and other fluorine-based resins is preferable, and other fluorine-based resins are more preferable. Examples of other fluororesins include tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / ethylene copolymer, polyvinylidene fluoride, polychlorotrifluoroethylene, ethylene-chlorotrifluoroethylene copolymer and the like. .. These may be used alone or in combination of two or more.
 補強部材12は、線材が編組された編組体、または線材が螺旋状に巻回されたコイル体であることが好ましい。これにより、先端屈曲ワイヤ50等による第1筒状部材10の突き破りを防止し易くすることができる。これらのうち編組体が剛性を向上し易いため、補強部材12は編組体であることがより好ましい。 The reinforcing member 12 is preferably a braided body in which the wire rod is braided, or a coil body in which the wire rod is spirally wound. This makes it easier to prevent the first tubular member 10 from being pierced by the tip bending wire 50 or the like. Of these, the reinforcing member 12 is more preferably a braided body because the braided body tends to improve the rigidity.
 補強部材12を構成する線材として、金属線、繊維等が挙げられる。金属線を構成する素材として、例えばステンレス鋼、チタン、ニッケルチタン合金、コバルトクロム合金、タングステン合金等が好ましい。このうちステンレス鋼がより好ましい。金属線は、単線であってもよいし、撚線であってもよい。繊維として、例えばポリアリレート繊維、アラミド繊維、超高分子量ポリエチレン繊維、PBO繊維、炭素繊維等が挙げられる。繊維は、モノフィラメントであってもよいし、マルチフィラメントであってもよい。 Examples of the wire material constituting the reinforcing member 12 include metal wire and fiber. As the material constituting the metal wire, for example, stainless steel, titanium, nickel-titanium alloy, cobalt-chromium alloy, tungsten alloy and the like are preferable. Of these, stainless steel is more preferable. The metal wire may be a single wire or a stranded wire. Examples of the fiber include polyarylate fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, PBO fiber, carbon fiber and the like. The fibers may be monofilaments or multifilaments.
 補強部材12には、筒状部材10の位置をX線透視下等で確認し易くするため、X線不透過性物質が含まれていてもよい。X線不透過性物質としては、例えば、鉛、バリウム、ヨウ素、タングステン、金、白金、イリジウム、白金イリジウム合金、ステンレス、チタン、コバルトクロム合金、パラジウム、及びタンタルよりなる群から選択される少なくとも1種が挙げられる。 The reinforcing member 12 may contain an X-ray opaque substance in order to make it easier to confirm the position of the tubular member 10 under fluoroscopy or the like. The X-ray impermeable substance is, for example, at least one selected from the group consisting of lead, barium, iodine, tungsten, gold, platinum, iridium, platinum iridium alloy, stainless steel, titanium, cobalt-chromium alloy, palladium, and tantalum. Seeds are mentioned.
 補強部14は、内層11と補強部材12とを備える。補強部14は、更に外層13を備えることが好ましい。補強部14は、内層11と外層13の間に補強部材12を備えることがより好ましい。 The reinforcing portion 14 includes an inner layer 11 and a reinforcing member 12. The reinforcing portion 14 preferably further includes an outer layer 13. It is more preferable that the reinforcing portion 14 is provided with the reinforcing member 12 between the inner layer 11 and the outer layer 13.
 外層13は、低密度ポリエチレン、ポリウレタン、ポリアミドエラストマー、及びポリアミドからなる群より選ばれる少なくとも1種を含むことが好ましく、ポリウレタン及びポリアミドからなる群より選ばれる少なくとも1種を含むことがより好ましい。低密度ポリエチレンとしては、密度が0.91g/cm以上、0.93g/cm以下のものが好ましい。 The outer layer 13 preferably contains at least one selected from the group consisting of low-density polyethylene, polyurethane, polyamide elastomer, and polyamide, and more preferably contains at least one selected from the group consisting of polyurethane and polyamide. The low-density polyethylene, density of 0.91 g / cm 3 or more, 0.93 g / cm 3 or less being preferred.
 更に図2、3に示す通り、第1筒状部材10は、補強部14の遠位端14Aよりも遠位側にポリテトラフルオロエチレンとテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体と補強部材12とを含まない樹脂製の延在部15を有する。 Further, as shown in FIGS. 2 and 3, the first tubular member 10 includes a polytetrafluoroethylene, a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and a reinforcing member on the distal side of the distal end 14A of the reinforcing portion 14. It has an extending portion 15 made of resin that does not contain 12 and.
 延在部15は、ポリテトラフルオロエチレンとテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体とを含有しないことにより、延在部15の内腔は補強部14の内層11の内腔よりも摩擦抵抗が高くなり易くなる。そのため、先端屈曲ワイヤ50をカテーテル1の近位側から遠位側に向かって挿入していく際に、延在部15に先端屈曲ワイヤ50が到達した時点で一時的に挿入速度が減弱され易くなる結果、先端屈曲ワイヤ50を勢いよく押し込み過ぎることに起因する先端屈曲ワイヤによる血管等の損傷を回避し易くすることができる。更に当該構成により、延在部15は柔軟性が向上し易くなるため、延在部15の内腔が先端屈曲ワイヤ50の形状に追従し易くなる結果、先端屈曲ワイヤ50による延在部15の突き破りを防止し易くできる。更に、上述したような摩擦抵抗の変化により、先端屈曲ワイヤ50の先端が延在部15に到達したことを施術者が感知した時点で押し込み力を加減することによっても、先端屈曲ワイヤによる延在部の突き破りを防止し易くできる。 Since the extending portion 15 does not contain polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, the lumen of the extending portion 15 has more frictional resistance than the cavity of the inner layer 11 of the reinforcing portion 14. Is likely to be high. Therefore, when the tip bending wire 50 is inserted from the proximal side to the distal side of the catheter 1, the insertion speed is likely to be temporarily reduced when the tip bending wire 50 reaches the extending portion 15. As a result, it is possible to easily avoid damage to blood vessels and the like due to the tip bending wire caused by pushing the tip bending wire 50 too vigorously. Further, with this configuration, the flexibility of the extending portion 15 is easily improved, so that the lumen of the extending portion 15 can easily follow the shape of the tip bending wire 50, and as a result, the extending portion 15 by the tip bending wire 50 is easily improved. It can be easily prevented from breaking through. Further, by adjusting the pushing force when the practitioner senses that the tip of the tip bending wire 50 has reached the extending portion 15 due to the change in frictional resistance as described above, the tip bending wire extends. It can be easily prevented from breaking through the part.
 延在部15は、ポリテトラフルオロエチレンとテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体とを含有しない。 The extending portion 15 does not contain polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer.
 延在部15を構成する樹脂として、具体的には、低密度ポリエチレン、ポリウレタン、ポリアミドエラストマー、及びポリアミドからなる群より選ばれる少なくとも1種が好ましく、ポリウレタン及びポリアミドからなる群より選ばれる少なくとも1種がより好ましい。また延在部15は、これらの樹脂からなることが好ましい。低密度ポリエチレンとしては、密度が0.91g/cm以上、0.93g/cm以下のものが好ましい。延在部15に含まれる樹脂と、補強部14の外層13に含まれる樹脂は、異なっていてもよいが、同じである方が両者を加熱溶融等により接合し易いため好ましい。また延在部15は、少なくとも補強部14の外層13と第2筒状部材20に接合されていることが好ましい。 As the resin constituting the extending portion 15, specifically, at least one selected from the group consisting of low-density polyethylene, polyurethane, polyamide elastomer, and polyamide is preferable, and at least one selected from the group consisting of polyurethane and polyamide is preferable. Is more preferable. Further, the extending portion 15 is preferably made of these resins. The low-density polyethylene, density of 0.91 g / cm 3 or more, 0.93 g / cm 3 or less being preferred. The resin contained in the extending portion 15 and the resin contained in the outer layer 13 of the reinforcing portion 14 may be different, but it is preferable that they are the same because they are easily joined by heating and melting. Further, it is preferable that the extending portion 15 is joined to at least the outer layer 13 of the reinforcing portion 14 and the second tubular member 20.
 延在部15は補強部材12を含まないことにより、柔軟性が向上し易くなる。またこれにより、後述するようなテーパ部15Tを形成し易くなっている。詳細には、補強部材12をテーパ状にする場合には、補強部材12を切断した後、血管を損傷しないように切断部に対してレーザー加工等を行う必要があるが、補強部材12を含まないことにより、このような端部処理を省略することができる。 Since the extending portion 15 does not include the reinforcing member 12, the flexibility is likely to be improved. Further, this makes it easy to form the tapered portion 15T as described later. Specifically, when the reinforcing member 12 is tapered, it is necessary to perform laser processing or the like on the cut portion so as not to damage the blood vessel after cutting the reinforcing member 12, but the reinforcing member 12 is included. By not having, such end processing can be omitted.
 図3に示す通り、第1筒状部材10の補強部14の遠位端14Aから延在部15の遠位端15Aまでの軸方向の長さLは、補強部14の遠位端14Aにおける補強部14の内径の4倍以上、35倍以下の長さであることが好ましい。詳細には、遠位端14Aから遠位端15Aまでの第1筒状部材10の軸方向の長さLが、遠位端14Aにおける補強部14の内径の4倍以上であることにより、延在部15の上記効果が発揮され易くなる。そのため、より好ましくは4.1倍以上、更に好ましくは4.2倍以上、更により好ましくは4.3倍以上である。一方、長さLが、遠位端14Aにおける補強部14の内径の35倍以下であることにより、先端屈曲ワイヤ50による延在部15の破損を回避し易くすることができる。そのため、より好ましくは30倍以下、更に好ましくは25倍以下である。なお補強部14の遠位端14Aにおける補強部14の内径は、好ましくは0.3mm以上、0.5mm以下である。 As shown in FIG. 3, the axial length L from the distal end 14A of the reinforcing portion 14 of the first tubular member 10 to the distal end 15A of the extending portion 15 is the distal end 14A of the reinforcing portion 14. The length is preferably 4 times or more and 35 times or less the inner diameter of the reinforcing portion 14. Specifically, the axial length L of the first tubular member 10 from the distal end 14A to the distal end 15A is extended by being four times or more the inner diameter of the reinforcing portion 14 at the distal end 14A. The above-mentioned effect of the existing portion 15 is easily exerted. Therefore, it is more preferably 4.1 times or more, further preferably 4.2 times or more, and even more preferably 4.3 times or more. On the other hand, when the length L is 35 times or less the inner diameter of the reinforcing portion 14 at the distal end 14A, it is possible to easily avoid damage to the extending portion 15 by the tip bending wire 50. Therefore, it is more preferably 30 times or less, still more preferably 25 times or less. The inner diameter of the reinforcing portion 14 at the distal end 14A of the reinforcing portion 14 is preferably 0.3 mm or more and 0.5 mm or less.
 第1筒状部材10の軸方向において、延在部15の遠位端15Aは、第2筒状部材20の遠位端20Aよりも近位側に位置することが好ましい。これにより延在部15の遠位端部が血管の内壁等に引っかかり難くなる。 In the axial direction of the first tubular member 10, the distal end 15A of the extending portion 15 is preferably located proximal to the distal end 20A of the second tubular member 20. This makes it difficult for the distal end of the extending portion 15 to get caught in the inner wall of the blood vessel or the like.
 図1に示すように、第1筒状部材10の補強部14の近位端14Bは、第2筒状部材20の近位端20Bよりも近位側に位置することが好ましい。このように第1筒状部材10の近位側に補強部14が存在することより、先端屈曲ワイヤ50による第1筒状部材10の近位側の突き破りを防止し易くできる。更に、第1筒状部材10の補強部14の近位端14Bは、後述するハンドル部70の内腔内に位置することがより好ましい。 As shown in FIG. 1, the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 is preferably located proximal to the proximal end 20B of the second tubular member 20. Since the reinforcing portion 14 is present on the proximal side of the first tubular member 10 in this way, it is possible to easily prevent the tip bending wire 50 from penetrating the proximal side of the first tubular member 10. Further, it is more preferable that the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 is located in the cavity of the handle portion 70, which will be described later.
 図1、7に示すように、第1筒状部材10の補強部14の近位端14Bは、第1筒状部材10の近位端10Bよりも遠位側に位置することが好ましい。即ち、第1筒状部材10の近位端部10bに補強部材12を備えていない非補強部17を有していることにより、製造工程において、例えば後述するハンドル部70の内腔と、第1筒状部材10の内腔とを連通し易い形状に非補強部17を加工することができる。 As shown in FIGS. 1 and 7, the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 is preferably located on the distal side of the proximal end 10B of the first tubular member 10. That is, by having the non-reinforcing portion 17 having no reinforcing member 12 at the proximal end portion 10b of the first tubular member 10, for example, in the manufacturing process, the lumen of the handle portion 70, which will be described later, and the first The non-reinforcing portion 17 can be processed into a shape that easily communicates with the lumen of the tubular member 10.
 図1~3、5に示すように、カテーテル1は、更に長手方向Xを有する第1外側筒状部材100を備え、第1外側筒状部材100の内腔に第1筒状部材10と第2筒状部材20が配置されていることが好ましい。これにより第1筒状部材10と第2筒状部材20の乖離を防止し易くすることができる。 As shown in FIGS. 1 to 3 and 5, the catheter 1 further includes a first outer tubular member 100 having a longitudinal direction X, and a first tubular member 10 and a first tubular member 10 in the lumen of the first outer tubular member 100. It is preferable that the two tubular members 20 are arranged. As a result, it is possible to easily prevent the first tubular member 10 and the second tubular member 20 from being separated from each other.
 図6は、図5の他の実施の形態を示す断面図である。図6に示すように、第1筒状部材10と第2筒状部材20の外側面は、第1筒状部材10の軸方向に延びる樹脂製の円柱状体300により封止されていてもよい。これにより先端屈曲ワイヤ50の貫通を防止し易くできる。 FIG. 6 is a cross-sectional view showing another embodiment of FIG. As shown in FIG. 6, even if the outer surfaces of the first tubular member 10 and the second tubular member 20 are sealed by the resin columnar body 300 extending in the axial direction of the first tubular member 10. Good. This makes it easier to prevent the tip bending wire 50 from penetrating.
 第1外側筒状部材100は、ポリエチレン、ポリウレタン、ポリアミドエラストマー、及びポリアミドからなる群から選択される少なくとも1種を含むことが好ましい。このうちポリウレタン、及びポリアミドよりなる群から選択される少なくとも1種がより好ましい。 The first outer tubular member 100 preferably contains at least one selected from the group consisting of polyethylene, polyurethane, polyamide elastomer, and polyamide. Of these, at least one selected from the group consisting of polyurethane and polyamide is more preferable.
 円柱状体300は、ポリエチレン、ポリウレタン、ポリアミドエラストマー、及びポリアミドからなる群から選択される少なくとも1種を含むことが好ましい。このうちポリウレタン、及びポリアミドよりなる群から選択される少なくとも1種がより好ましい。 The columnar body 300 preferably contains at least one selected from the group consisting of polyethylene, polyurethane, polyamide elastomer, and polyamide. Of these, at least one selected from the group consisting of polyurethane and polyamide is more preferable.
 図3に示すように、第1筒状部材10の延在部15は、遠位側に開口部15Oを有し、開口部15Oは、テーパ面と外側面とを備えるテーパ部15Tを有することが好ましい。遠位側に向かって先細りになるテーパ部15Tにより、第1筒状部材10の遠位端部が血管の内壁等に引っかかり難くなる。但し、延在部15が柔軟性に優れる樹脂により構成され、血管の損傷のおそれが極めて低い場合には、テーパ部15Tを形成しなくてもよい。 As shown in FIG. 3, the extending portion 15 of the first tubular member 10 has an opening 15O on the distal side, and the opening 15O has a tapered portion 15T having a tapered surface and an outer surface. Is preferable. The tapered portion 15T that tapers toward the distal side makes it difficult for the distal end of the first tubular member 10 to get caught in the inner wall of the blood vessel or the like. However, if the extending portion 15 is made of a resin having excellent flexibility and the risk of damage to blood vessels is extremely low, the tapered portion 15T may not be formed.
 テーパ部15Tのテーパ面は、第1筒状部材10の軸方向に対して、5°以上、85°以下の角度で傾斜していることが好ましい。傾斜角が85°以下であることにより、第1筒状部材10の遠位端部が血管の内壁等に引っかかり難くなる。そのため、傾斜角は、より好ましくは60°以下、更に好ましくは40°以下、更により好ましくは30°以下である。一方、テーパ部15Tのテーパ面が5°以上の角度で傾斜していることにより、開口15Oの大きさを低減することができる。そのため傾斜角は、より好ましくは8°以上、更に好ましくは10°以上である。 The tapered surface of the tapered portion 15T is preferably inclined at an angle of 5 ° or more and 85 ° or less with respect to the axial direction of the first tubular member 10. When the inclination angle is 85 ° or less, the distal end portion of the first tubular member 10 is less likely to be caught by the inner wall of the blood vessel or the like. Therefore, the inclination angle is more preferably 60 ° or less, still more preferably 40 ° or less, and even more preferably 30 ° or less. On the other hand, since the tapered surface of the tapered portion 15T is inclined at an angle of 5 ° or more, the size of the opening 15O can be reduced. Therefore, the inclination angle is more preferably 8 ° or more, still more preferably 10 ° or more.
 図4は、図3の他の実施の形態を示す断面図である。図4に示すように、第1筒状部材10は、開口部15Oよりも遠位側に、第2筒状部材20とは反対側に向かって***している***部16を有することが好ましい。これにより第1筒状部材10に挿入するワイヤの先端を第2筒状部材20に挿入するワイヤの先端とは異なる向きに誘導することができるため、分岐部病変等に対する処置を行い易くすることができる。またこれにより、それぞれのワイヤを絡み難くすることができる。なお図3、4中における一点鎖線は、ワイヤの進行経路を示している。 FIG. 4 is a cross-sectional view showing another embodiment of FIG. As shown in FIG. 4, it is preferable that the first tubular member 10 has a raised portion 16 that is raised toward the side opposite to the second tubular member 20 on the distal side of the opening 15O. .. As a result, the tip of the wire to be inserted into the first tubular member 10 can be guided in a direction different from the tip of the wire to be inserted into the second tubular member 20, so that treatment for a bifurcation lesion or the like can be facilitated. Can be done. Further, this makes it difficult for each wire to be entangled. The alternate long and short dash line in FIGS. 3 and 4 indicates the traveling path of the wire.
 図2、3等に示すように、第2筒状部材20は、内層11と外層13とを有することが好ましい。更に内層11と外層13の間に補強部材12を備えていないことがより好ましい。これにより第2筒状部材20の柔軟性を向上し易くすることができる。なお第2筒状部材20は、カテーテル1を病変部近傍にまで誘導するためのガイドワイヤが好適に挿入されるが、このようなガイドワイヤは、先端屈曲ワイヤ50より柔軟性が高く第2筒状部材20を突き破る可能性は極めて低いため、第2筒状部材20は補強部材12を備えていなくともよい。 As shown in FIGS. 2 and 3, it is preferable that the second tubular member 20 has an inner layer 11 and an outer layer 13. Further, it is more preferable that the reinforcing member 12 is not provided between the inner layer 11 and the outer layer 13. This makes it easier to improve the flexibility of the second tubular member 20. A guide wire for guiding the catheter 1 to the vicinity of the lesion is preferably inserted into the second tubular member 20, but such a guide wire is more flexible than the tip bending wire 50 and is the second cylinder. Since the possibility of breaking through the shaped member 20 is extremely low, the second tubular member 20 does not have to include the reinforcing member 12.
 第2筒状部材20における外層13の素材は、上述した第1筒状部材10の補強部14の外層13の記載を参照することができる。 For the material of the outer layer 13 of the second tubular member 20, the description of the outer layer 13 of the reinforcing portion 14 of the first tubular member 10 can be referred to.
 第2筒状部材20における内層11は、ポリアミド系樹脂、ポリエステル系樹脂、ポリウレタン系樹脂、ポリオレフィン系樹脂、フッ素系樹脂、塩化ビニル系樹脂、シリコーン系樹脂、及び天然ゴムよりなる群から選択される少なくとも1種を含むことが好ましい。このうちポリエステル系樹脂、ポリオレフィン系樹脂、フッ素系樹脂、シリコーン系樹脂、及び天然ゴムよりなる群から選択される少なくとも1種がより好ましく、ポリオレフィン系樹脂、及びフッ素系樹脂よりなる群から選択される少なくとも1種が更に好ましい。なおポリオレフィン系樹脂には、ポリエチレンも含まれ、ポリエチレンとして、JIS K6922-1の規定に基づいて測定される密度が942kg/m以上である高密度ポリエチレンが挙げられる。 The inner layer 11 of the second tubular member 20 is selected from the group consisting of a polyamide resin, a polyester resin, a polyurethane resin, a polyolefin resin, a fluorine resin, a vinyl chloride resin, a silicone resin, and a natural rubber. It is preferable to contain at least one kind. Of these, at least one selected from the group consisting of polyester-based resin, polyolefin-based resin, fluorine-based resin, silicone-based resin, and natural rubber is more preferable, and it is selected from the group consisting of polyolefin-based resin and fluorine-based resin. At least one is more preferred. The polyolefin-based resin also includes polyethylene, and examples of the polyethylene include high-density polyethylene having a density of 942 kg / m 3 or more measured based on the provisions of JIS K6922-1.
 図2、3に示す通り、第2筒状部材20は、補強部14の遠位端14Aよりも遠位側の位置に、第1のX線不透過性マーカー31と第2のX線不透過性マーカー32のようなX線不透過性マーカーが配置されていることが好ましい。これにより第2筒状部材の遠位端20Aや、第1筒状部材10の遠位側の開口部15O等の体内における位置を把握し易くすることができる。但し、第2筒状部材20は、必ずしも第1のX線不透過性マーカー31と第2のX線不透過性マーカー32の両方を備えている必要は無く、第1のX線不透過性マーカー31だけ備えていてもよいし、第2のX線不透過性マーカー32だけ備えていてもよい。また、第2筒状部材20は、第1のX線不透過性マーカー31と第2のX線不透過性マーカー32以外にも、他のX線不透過性マーカーを備えていてもよい。 As shown in FIGS. 2 and 3, the second tubular member 20 has a first X-ray opaque marker 31 and a second X-ray impermeable marker at positions distal to the distal end 14A of the reinforcing portion 14. It is preferable that an X-ray opaque marker such as the permeable marker 32 is arranged. As a result, it is possible to easily grasp the positions of the distal end 20A of the second tubular member, the opening 15O on the distal side of the first tubular member 10, and the like in the body. However, the second tubular member 20 does not necessarily have to include both the first X-ray opaque marker 31 and the second X-ray opaque marker 32, and the first X-ray opaque marker 32 is not necessarily provided. Only the marker 31 may be provided, or only the second X-ray opaque marker 32 may be provided. Further, the second tubular member 20 may include other X-ray opaque markers in addition to the first X-ray opaque marker 31 and the second X-ray opaque marker 32.
 図3に示すように、第1のX線不透過性マーカー31は、延在部15の遠位側の開口部15Oの遠位端15OAよりも遠位側に位置することが好ましい。これにより、体内における第2筒状部材20の遠位端20Aの位置を把握し易くすることができる。また第2のX線不透過性マーカー32は、開口部15Oの近位端15OBも近位側に位置することが好ましい。これにより、体内における開口部15Oの位置を把握し易くすることができる。 As shown in FIG. 3, the first X-ray opaque marker 31 is preferably located on the distal side of the distal end 15OA of the opening 15O on the distal side of the extending portion 15. This makes it easier to grasp the position of the distal end 20A of the second tubular member 20 in the body. Further, it is preferable that the second X-ray opaque marker 32 is also located on the proximal side of the proximal end 15OB of the opening 15O. This makes it easier to grasp the position of the opening 15O in the body.
 図4は、図3の他の実施の形態を示す断面図である。図4に示すように***部16を有する場合、第1のX線不透過性マーカー31は、延在部15の遠位側の開口部15Oの遠位端15OAよりも遠位側に位置し、第2のX線不透過性マーカー32は、***部16よりも近位側に位置することが好ましい。これにより体内における開口部15Oの位置を正確に把握し易くすることができる。 FIG. 4 is a cross-sectional view showing another embodiment of FIG. When having the ridge 16 as shown in FIG. 4, the first X-ray opaque marker 31 is located distal to the distal end 15OA of the distal opening 15O of the extension 15. , The second X-ray opaque marker 32 is preferably located proximal to the ridge 16. This makes it easier to accurately grasp the position of the opening 15O in the body.
 また第2筒状部材20は、補強部14の遠位端14Aよりも近位側に、X線不透過性マーカーが配置されていないことが好ましい。これにより外径を低減しつつ、柔軟性を向上し易くすることができる。 Further, it is preferable that the second tubular member 20 does not have an X-ray opaque marker arranged on the proximal side of the distal end 14A of the reinforcing portion 14. As a result, it is possible to easily improve the flexibility while reducing the outer diameter.
 第1筒状部材10は、延在部15にX線不透過性マーカーが配置されていないことが好ましい。 It is preferable that the X-ray opaque marker is not arranged on the extending portion 15 of the first tubular member 10.
 X線不透過性マーカーの形状は、特に限定されないが、帯状、らせん状等が挙げられる。X線不透過性マーカーを構成する素材として、上記X線不透過性物質が挙げられる。 The shape of the X-ray opaque marker is not particularly limited, and examples thereof include a band shape and a spiral shape. Examples of the material constituting the X-ray opaque marker include the above-mentioned X-ray opaque substance.
 図1、2に示すように、カテーテル1は、第2筒状部材20の近位端20Bよりも近位側に、長手方向Xを有する第2外側筒状部材200を備え、第2外側筒状部材200の内腔に第1筒状部材10が配置されていることが好ましい。このような第2外側筒状部材200を備えること、いわゆる二重管構造(コアキシャル構造)とすることにより、第1筒状部材10を保護しつつ、押し込み力伝達性を向上することができる。 As shown in FIGS. 1 and 2, the catheter 1 includes a second outer tubular member 200 having a longitudinal direction X on the proximal side of the proximal end 20B of the second tubular member 20, and the second outer cylinder. It is preferable that the first tubular member 10 is arranged in the cavity of the shaped member 200. By providing such a second outer tubular member 200, that is, a so-called double pipe structure (coaxial structure), it is possible to improve the pushing force transmission property while protecting the first tubular member 10.
 第2外側筒状部材200の素材としては、第1外側筒状部材100の素材の記載を参照することができる。第2外側筒状部材200は第1外側筒状部材100と同じ素材を含むことが好ましい。また、第2外側筒状部材200の遠位端と、第1外側筒状部材100の近位端は、一体化されていることが好ましい。 As the material of the second outer tubular member 200, the description of the material of the first outer tubular member 100 can be referred to. The second outer tubular member 200 preferably contains the same material as the first outer tubular member 100. Further, it is preferable that the distal end of the second outer tubular member 200 and the proximal end of the first outer tubular member 100 are integrated.
 第1筒状部材10の外側面は、第1筒状部材10の軸方向に沿って金属補強線19を備えることが好ましい。これにより押し込み力伝達性を向上することができる。金属補強線19は1本であってもよいし、2本以上であってもよい。金属補強線19は、少なくとも第1筒状部材10の補強部14の近位端14Bよりも遠位側から第2筒状部材20の近位端20Bの位置まで存在することが好ましい。また、金属補強線19の形状は、近位側から遠位側に向かって寸胴形状であってもよいし、遠位側に向かって先細りのテーパ形状であってもよい。金属補強線19の素材としては、ステンレス、ニッケルチタン、コバルトクロム等が挙げられる。 It is preferable that the outer surface of the first tubular member 10 is provided with a metal reinforcing wire 19 along the axial direction of the first tubular member 10. Thereby, the pushing force transmissibility can be improved. The number of metal reinforcing wires 19 may be one or two or more. It is preferable that the metal reinforcing wire 19 exists at least from the distal side of the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 to the position of the proximal end 20B of the second tubular member 20. Further, the shape of the metal reinforcing wire 19 may be a barrel shape from the proximal side to the distal side, or a tapered shape that tapers toward the distal side. Examples of the material of the metal reinforcing wire 19 include stainless steel, nickel titanium, cobalt chrome and the like.
 第1筒状部材10は、外層13を備えることが好ましい。具体的には、少なくとも補強部14に外層13を備えることが好ましい。詳細は、補強部14の外層13の記載を参照すればよい。 The first tubular member 10 preferably includes an outer layer 13. Specifically, it is preferable that at least the reinforcing portion 14 is provided with the outer layer 13. For details, refer to the description of the outer layer 13 of the reinforcing portion 14.
 図1に示すように、第1筒状部材10の近位端部10bには、ハンドル部70が接続されていることが好ましい。図7は、図1の領域R2の第1筒状部材10の軸方向の断面の一部拡大図であり、図1と図7を参照しながらハンドル部70について説明する。 As shown in FIG. 1, it is preferable that the handle portion 70 is connected to the proximal end portion 10b of the first tubular member 10. FIG. 7 is a partially enlarged view of a cross section of the first tubular member 10 in the region R2 of FIG. 1 in the axial direction, and the handle portion 70 will be described with reference to FIGS. 1 and 7.
 ハンドル部70は、図7に示すように、第1内腔71と、第1内腔71よりも近位側に第2内腔72とを有し、第1内腔71の近位端71Bの内径は、第2内腔72の遠位端72Aの内径よりも大きいことが好ましい。これにより、第1筒状部材10の近位端部10bを第1内腔71内に配置し易くすることができる。 As shown in FIG. 7, the handle portion 70 has a first lumen 71 and a second lumen 72 proximal to the first lumen 71, and the proximal end 71B of the first lumen 71. The inner diameter of the second lumen 72 is preferably larger than the inner diameter of the distal end 72A of the second lumen 72. As a result, the proximal end portion 10b of the first tubular member 10 can be easily arranged in the first lumen 71.
 更に図7に示すように、第1内腔71には、第1内腔71の近位端71Bに非補強部17の近位端17Bが位置するように非補強部17が固定されていることが好ましい。即ち、第1内腔71内には第1筒状部材10の非補強部17が配置されて、第2内腔72は非補強部17と補強部14の内腔と連通するようになっていることが好ましい。 Further, as shown in FIG. 7, the non-reinforcing portion 17 is fixed to the first lumen 71 so that the proximal end 17B of the non-reinforcing portion 17 is located at the proximal end 71B of the first lumen 71. Is preferable. That is, the non-reinforcing portion 17 of the first tubular member 10 is arranged in the first lumen 71, and the second lumen 72 communicates with the non-reinforcing portion 17 and the lumen of the reinforcing portion 14. Is preferable.
 非補強部17は、第1筒状部材10の近位端部10bにおける補強部材12を有さない部分である。非補強部17は近位側に向かって内径が拡径するテーパ部17Tを有することが好ましい。このようにテーパ部17Tを備えていれば、テーパ部17Tの遠位端と補強部14の近位端14Bとの内腔間に段差があったとしても、テーパ部17Tにより先端屈曲ワイヤ50の先端が当該段差から離れる方向に誘導されるため引っかかり難くなる。 The non-reinforcing portion 17 is a portion of the proximal end portion 10b of the first tubular member 10 that does not have the reinforcing member 12. The non-reinforcing portion 17 preferably has a tapered portion 17T whose inner diameter increases toward the proximal side. If the tapered portion 17T is provided in this way, even if there is a step between the distal end of the tapered portion 17T and the proximal end 14B of the reinforcing portion 14, the tapered portion 17T allows the tip bending wire 50 to be formed. Since the tip is guided in the direction away from the step, it becomes difficult to get caught.
 非補強部17のテーパ部17Tの内壁は、第1筒状部材10の軸方向に対して3°以上、85°以下の角度で傾斜していることが好ましい。傾斜角が3°以上であることにより、例えば図1に示すような先端屈曲ワイヤ50の屈曲部がある程度、伸長された状態になるため、第1筒状部材10の内腔へ先端屈曲ワイヤ50を挿入し易くすることができる。一方、傾斜角が85°以下であることにより、テーパ部17Tの内壁と接触することに伴うワイヤの移動抵抗を低減し易くすることができる。そのため傾斜角は、より好ましくは70°以下、更に好ましくは60°以下、更により好ましくは50°以下、特に好ましくは20°以下である。 The inner wall of the tapered portion 17T of the non-reinforcing portion 17 is preferably inclined at an angle of 3 ° or more and 85 ° or less with respect to the axial direction of the first tubular member 10. When the inclination angle is 3 ° or more, for example, the bent portion of the tip bending wire 50 as shown in FIG. 1 is extended to some extent, so that the tip bending wire 50 is inserted into the cavity of the first tubular member 10. Can be easily inserted. On the other hand, when the inclination angle is 85 ° or less, it is possible to easily reduce the movement resistance of the wire due to contact with the inner wall of the tapered portion 17T. Therefore, the inclination angle is more preferably 70 ° or less, still more preferably 60 ° or less, even more preferably 50 ° or less, and particularly preferably 20 ° or less.
 更にカテーテル1は、第2内腔72から、第1筒状部材10の内腔への先端屈曲ワイヤ50の挿入をし易くするために、下記式(1)~(3)を満たすように構成されていることが好ましい。 Further, the catheter 1 is configured to satisfy the following equations (1) to (3) in order to facilitate insertion of the tip bending wire 50 from the second lumen 72 into the lumen of the first tubular member 10. It is preferable that it is.
 a<b ・・・(1)
[式中、aは、第1筒状部材10の補強部14の近位端14Bから遠位側に1mm離れた位置14Cにおける内径(mm)である。bは、第1筒状部材10の非補強部17の近位端17Bにおける内径(mm)である。]
 非補強部17の近位端17Bにおける内径b(mm)が、補強部14の近位端14Bから遠位側に1mm離れた位置14Cにおける内径a(mm)よりも大きいことにより、非補強部17が近位側に向かって拡径した状態になる。その結果、近位側から先端屈曲ワイヤ50を第1筒状部材10の内腔へ挿入し易くすることができる。そのため内径bは、より好ましくは内径aの1.1倍以上、更に好ましくは1.2倍以上、更により好ましくは1.3倍以上である。一方、上限は特に限定されないが、例えば内径bは、内径aの10倍以下、5倍以下、2倍以下であってもよい。なお内径a(mm)は、好ましくは0.1mm以上、0.8mm以下であり、より好ましくは0.3mm以上、0.55mm以下である。
a <b ... (1)
[In the formula, a is an inner diameter (mm) at a position 14C 1 mm away from the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 on the distal side. b is the inner diameter (mm) at the proximal end 17B of the non-reinforcing portion 17 of the first tubular member 10. ]
The inner diameter b (mm) at the proximal end 17B of the non-reinforcing portion 17 is larger than the inner diameter a (mm) at the position 14C 1 mm away from the proximal end 14B of the reinforcing portion 14 to the distal side. 17 is in a state of expanding in diameter toward the proximal side. As a result, the tip bending wire 50 can be easily inserted into the lumen of the first tubular member 10 from the proximal side. Therefore, the inner diameter b is more preferably 1.1 times or more, still more preferably 1.2 times or more, still more preferably 1.3 times or more the inner diameter a. On the other hand, the upper limit is not particularly limited, but for example, the inner diameter b may be 10 times or less, 5 times or less, or 2 times or less the inner diameter a. The inner diameter a (mm) is preferably 0.1 mm or more and 0.8 mm or less, and more preferably 0.3 mm or more and 0.55 mm or less.
 a<c ・・・(2)
[式中、aは、第1筒状部材10の補強部14の近位端14Bから遠位側に1mm離れた位置14Cにおける内径(mm)である。cは、ハンドル部70の第2内腔72の遠位端72Aにおける内径(mm)である。]
 ハンドル部70の第2内腔72の遠位端72Aにおける内径c(mm)が、第1筒状部材10の補強部14の近位端14Bから遠位側に1mm離れた位置14Cにおける内径a(mm)よりも大きいことにより、第2内腔72の遠位端72A近傍の内壁との接触による先端屈曲ワイヤ50の移動抵抗を低減することができる。また先端屈曲ワイヤ50を挿入する場合には、内径cが小さいと、第2内腔72の遠位端72Aを通過する時点で屈曲部が伸びきってしまうおそれがあるが、内径cが内径aより大きいことにより、このような伸びきりの問題を回避し易くすることができる。そのため内径cは、より好ましくは内径aの1.1倍以上、更に好ましくは1.2倍以上、更により好ましくは1.3倍以上である。一方、上限は特に限定されないが、例えば内径cは、内径aの5倍以下、4倍以下、3倍以下であってもよい。
a <c ・ ・ ・ (2)
[In the formula, a is an inner diameter (mm) at a position 14C 1 mm away from the proximal end 14B of the reinforcing portion 14 of the first tubular member 10 on the distal side. c is the inner diameter (mm) at the distal end 72A of the second lumen 72 of the handle 70. ]
The inner diameter c (mm) at the distal end 72A of the second lumen 72 of the handle portion 70 is the inner diameter a at a position 14C distal to the proximal end 14B of the reinforcing portion 14 of the first tubular member 10. When it is larger than (mm), the movement resistance of the tip bending wire 50 due to contact with the inner wall in the vicinity of the distal end 72A of the second lumen 72 can be reduced. Further, when the tip bending wire 50 is inserted, if the inner diameter c is small, the bent portion may be fully extended when passing through the distal end 72A of the second lumen 72, but the inner diameter c is the inner diameter a. By making it larger, it is possible to easily avoid such a problem of stretch. Therefore, the inner diameter c is more preferably 1.1 times or more, still more preferably 1.2 times or more, still more preferably 1.3 times or more the inner diameter a. On the other hand, the upper limit is not particularly limited, but for example, the inner diameter c may be 5 times or less, 4 times or less, or 3 times or less the inner diameter a.
 b≧c ・・・(3)
[式中、bは、第1筒状部材10の非補強部17の近位端17Bにおける内径(mm)である。cは、ハンドル部70の第2内腔72の遠位端72Aにおける内径(mm)である。]
 非補強部17の近位端17Bにおける内径b(mm)が、ハンドル部70の第2内腔72の遠位端72Aにおける内径c(mm)以上であることにより、先端屈曲ワイヤ50を近位側から遠位側に向かって挿入する際に、非補強部17の近位端17Bに引っかかり難くすることができる。そのため内径bは、より好ましくは内径cの1.1倍以上、更に好ましくは1.2倍以上、更により好ましくは1.3倍以上である。一方、内径bが、内径cの2.0倍以下であることにより、先端屈曲ワイヤ50を近位側に向かって引き戻す際に、第2内腔72の遠位端72Aに引っかかり難くすることができる。そのため内径bは、好ましくは内径cの2.0倍以下、より好ましくは1.7倍以下、更に好ましくは1.5倍以下である。
b ≧ c ・ ・ ・ (3)
[In the formula, b is the inner diameter (mm) at the proximal end 17B of the non-reinforcing portion 17 of the first tubular member 10. c is the inner diameter (mm) at the distal end 72A of the second lumen 72 of the handle 70. ]
The tip bending wire 50 is proximal because the inner diameter b (mm) at the proximal end 17B of the non-reinforcing portion 17 is equal to or greater than the inner diameter c (mm) at the distal end 72A of the second lumen 72 of the handle portion 70. When inserting from the side to the distal side, it can be made difficult to get caught in the proximal end 17B of the non-reinforcing portion 17. Therefore, the inner diameter b is more preferably 1.1 times or more, still more preferably 1.2 times or more, still more preferably 1.3 times or more the inner diameter c. On the other hand, since the inner diameter b is 2.0 times or less the inner diameter c, it is difficult for the tip bending wire 50 to be caught by the distal end 72A of the second lumen 72 when the tip bending wire 50 is pulled back toward the proximal side. it can. Therefore, the inner diameter b is preferably 2.0 times or less, more preferably 1.7 times or less, still more preferably 1.5 times or less the inner diameter c.
 ハンドル部70の第2内腔72は、図1、7に示すように遠位側に向かって縮径するテーパ部72Tを有することが好ましい。遠位側に向かって縮径するテーパ部に対して、先端屈曲ワイヤ50を遠位側に向かって挿入していくと、先端屈曲ワイヤ50の屈曲部がある程度、伸長された状態になるため、第1筒状部材10の内腔へ先端屈曲ワイヤ50を挿入し易くすることができる。 The second lumen 72 of the handle portion 70 preferably has a tapered portion 72T whose diameter is reduced toward the distal side as shown in FIGS. 1 and 7. When the tip bending wire 50 is inserted toward the distal side with respect to the tapered portion whose diameter is reduced toward the distal side, the bent portion of the tip bending wire 50 is extended to some extent. The tip bending wire 50 can be easily inserted into the cavity of the first tubular member 10.
 ハンドル部70の第2内腔72のテーパ部72Tの内壁は、第1筒状部材10の軸方向に対して5°以上、85°以下の角度で傾斜していることが好ましい。傾斜角が5°以上であることにより、先端屈曲ワイヤ50の屈曲部をある程度、伸長された状態にし易くすることができる。一方、傾斜角が85°以下であることにより、第2内腔72のテーパ部72Tの内壁と接触することに伴うワイヤの移動抵抗を低減し易くすることができる。そのため傾斜角は、より好ましくは70°以下、更に好ましくは60°以下、更により好ましくは50°以下である。 It is preferable that the inner wall of the tapered portion 72T of the second lumen 72 of the handle portion 70 is inclined at an angle of 5 ° or more and 85 ° or less with respect to the axial direction of the first tubular member 10. When the inclination angle is 5 ° or more, the bent portion of the tip bending wire 50 can be easily extended to some extent. On the other hand, when the inclination angle is 85 ° or less, it is possible to easily reduce the movement resistance of the wire due to contact with the inner wall of the tapered portion 72T of the second lumen 72. Therefore, the inclination angle is more preferably 70 ° or less, still more preferably 60 ° or less, and even more preferably 50 ° or less.
 ハンドル部70の第1内腔71は、図7に示すように遠位側の径が大きくなるような段差部を有していてもよい。これにより、第2外側筒状部材200を第1内腔71内に配置し易くすることができる。但し第1内腔71は、長手方向Xにおいて径の大きさがほぼ一定の寸胴形状であってもよい。 As shown in FIG. 7, the first lumen 71 of the handle portion 70 may have a stepped portion having a large diameter on the distal side. As a result, the second outer tubular member 200 can be easily arranged in the first cavity 71. However, the first lumen 71 may have a barrel shape having a diameter substantially constant in the longitudinal direction X.
 第2外側筒状部材200の近位端200Bは、図7に示すように補強部14の近位端14Bよりも遠位側に位置することが好ましい。これにより、補強部14の外側面も接着剤73等により固定することができ、固定力が向上し易くなる。 As shown in FIG. 7, the proximal end 200B of the second outer tubular member 200 is preferably located on the distal side of the proximal end 14B of the reinforcing portion 14. As a result, the outer surface of the reinforcing portion 14 can also be fixed by the adhesive 73 or the like, and the fixing force can be easily improved.
 なお第1筒状部材10の近位端部10bや第2外側筒状部材200の近位端部200bを第1内腔71内に固定するに当たっては、接着剤73等を用いればよい。 An adhesive 73 or the like may be used to fix the proximal end 10b of the first tubular member 10 and the proximal end 200b of the second outer tubular member 200 into the first cavity 71.
 接着剤73は、シアノアクリレート系接着剤、アクリル系接着剤、エポキシ系接着剤、及びウレタン系接着剤よりなる群から選択される少なくとも1種であることが好ましく、アクリル系接着剤、及びウレタン系接着剤よりなる群から選択される少なくとも1種であることがより好ましい。このうちウレタン系接着剤は、耐久性に優れ、樹脂との密着性にも優れるため、ウレタン系接着剤であることが更により好ましい。また射出成形によって補強部14の周囲にハンドル部70を形成する場合、補強部14に圧力がかかって破損し易くなってしまうが、ハンドル部70を予め成形しておき、得られたハンドル部70内に接着剤を用いて補強部14を固定することにより、上記のような圧力による破損を回避し易くすることができる。 The adhesive 73 is preferably at least one selected from the group consisting of cyanoacrylate adhesives, acrylic adhesives, epoxy adhesives, and urethane adhesives, and is preferably an acrylic adhesive and a urethane adhesive. More preferably, it is at least one selected from the group consisting of adhesives. Of these, urethane-based adhesives are even more preferably urethane-based adhesives because they are excellent in durability and adhesion to resins. Further, when the handle portion 70 is formed around the reinforcing portion 14 by injection molding, pressure is applied to the reinforcing portion 14 and the reinforcing portion 14 is easily damaged. However, the handle portion 70 is obtained by molding the reinforcing portion 70 in advance. By fixing the reinforcing portion 14 inside using an adhesive, it is possible to easily avoid damage due to the above pressure.
 第1筒状部材10の外層13は、接着剤73等により固定される部分において、微粒子を含有することが好ましい。これにより外層13の表面に微小な凹凸ができ易くなって、接着剤73等により固定され易くなる。微粒子として顔料が挙げられ、顔料として無機微粒子、有機微粒子、合成無機顔料が挙げられる。微粒子の長径は、好ましくは0.1μm以上、より好ましくは0.5μm以上、更に好ましくは0.8μm以上であって、好ましくは50μm以下、より好ましくは10μm以下、更に好ましくは5μm以下である。 The outer layer 13 of the first tubular member 10 preferably contains fine particles in a portion fixed by an adhesive 73 or the like. As a result, minute irregularities are likely to be formed on the surface of the outer layer 13, and it is easy to be fixed by the adhesive 73 or the like. Examples of the fine particles include pigments, and examples of the pigments include inorganic fine particles, organic fine particles, and synthetic inorganic pigments. The major axis of the fine particles is preferably 0.1 μm or more, more preferably 0.5 μm or more, still more preferably 0.8 μm or more, preferably 50 μm or less, more preferably 10 μm or less, still more preferably 5 μm or less.
 第1筒状部材10の外層13は、第1内腔71内に位置する部分において、バリウム塩を含有することが好ましい。これにより外層13にタック性が高いウレタン樹脂等を含有させても、製造工程において筒状部材10の近位端部10bを第1内腔71内に挿入するときに引っかかり難くすることができる。バリウム塩として、硫酸バリウム、炭酸バリウム、水酸化バリウム、塩化バリウム、硝酸バリウム、及び酢酸バリウムよりなる群から選択される少なくとも1種が好ましく、硫酸バリウムがより好ましい。 The outer layer 13 of the first tubular member 10 preferably contains a barium salt in a portion located in the first lumen 71. As a result, even if the outer layer 13 contains a urethane resin or the like having a high tack property, it can be made difficult to be caught when the proximal end portion 10b of the tubular member 10 is inserted into the first cavity 71 in the manufacturing process. As the barium salt, at least one selected from the group consisting of barium sulfate, barium carbonate, barium hydroxide, barium chloride, barium nitrate, and barium acetate is preferable, and barium sulfate is more preferable.
 第2外側筒状部材200は、接着剤73等により固定される部分において、微粒子を含有することが好ましい。微粒子は、上記外層13の記載を参照することができる。 The second outer tubular member 200 preferably contains fine particles in a portion fixed by the adhesive 73 or the like. For the fine particles, the description of the outer layer 13 can be referred to.
 第2外側筒状部材200は、第1内腔71内に位置する部分において、バリウム塩を含有することが好ましい。バリウム塩は、上記外層13の記載を参照することができる。 The second outer tubular member 200 preferably contains a barium salt in a portion located in the first cavity 71. For the barium salt, the description of the outer layer 13 can be referred to.
 図7に示す通り、ハンドル部70には、ハンドル部70の外表面から第1内腔71に連通する流体注入用の貫通孔74が設けられていてもよい。これにより貫通孔74を介して、加熱した流体や殺菌性の流体を第2外側筒状部材200の内腔内に注入して滅菌を行うことができる。またハンドル部70には、ハンドル部70の外表面から第1内腔71へ連通する接着剤注入用の貫通孔75が設けられていてもよい。これにより外部から接着剤73を注入して非補強部17等を固定することができる。 As shown in FIG. 7, the handle portion 70 may be provided with a through hole 74 for fluid injection that communicates with the first lumen 71 from the outer surface of the handle portion 70. As a result, a heated fluid or a bactericidal fluid can be injected into the lumen of the second outer tubular member 200 through the through hole 74 for sterilization. Further, the handle portion 70 may be provided with a through hole 75 for injecting an adhesive that communicates from the outer surface of the handle portion 70 to the first cavity 71. As a result, the adhesive 73 can be injected from the outside to fix the non-reinforcing portion 17 and the like.
 第2外側筒状部材200の外側面は、図7に示す通り、接着剤73により第1内腔71の内腔に固定されていてもよい。この場合、第2外側筒状部材200の近位端部は接着剤73により封止されていないことが好ましい。これにより、上述したように加熱した流体や殺菌性の流体を第2外側筒状部材200の内腔内に注入して滅菌を行うことができる。 As shown in FIG. 7, the outer surface of the second outer tubular member 200 may be fixed to the lumen of the first lumen 71 by the adhesive 73. In this case, it is preferable that the proximal end of the second outer tubular member 200 is not sealed with the adhesive 73. Thereby, as described above, the heated fluid or the bactericidal fluid can be injected into the cavity of the second outer tubular member 200 for sterilization.
 また第2外側筒状部材200は、必ずしも図7のように第1内腔71内に接着剤73を介して固定されている必要は無い。例えば、ハンドル部70の遠位端部の外表面に接着剤73を付着させて、第1内腔71外で第2外側筒状部材200が固定されていてもよい。この場合、第2外側筒状部材200は、第1内腔71内において接着剤73を介して固定されていないことが好ましい。これにより製造時の作業効率が向上し易くなる。 Further, the second outer tubular member 200 does not necessarily have to be fixed in the first cavity 71 via the adhesive 73 as shown in FIG. 7. For example, the second outer tubular member 200 may be fixed outside the first lumen 71 by adhering the adhesive 73 to the outer surface of the distal end portion of the handle portion 70. In this case, it is preferable that the second outer tubular member 200 is not fixed in the first cavity 71 via the adhesive 73. This makes it easier to improve work efficiency during manufacturing.
 ハンドル部70の外形は、施術者が指で把持できるような形状になっていることが好ましい。ハンドル部70は、射出成形等により得られる樹脂成形品であることが好ましい。樹脂として、例えば、ポリエチレン、ポリプロピレン等のポリオレフィン系樹脂、ポリカーボネート系樹脂、(メタ)アクリル系樹脂等が挙げられる。これらの樹脂のうちポリカーボネート、ポリメタクリル酸メチル等の透明性樹脂が好ましい。これによりハンドル部70内部が見え易くなって、ワイヤを挿入し易くすることができる。 The outer shape of the handle portion 70 is preferably shaped so that the practitioner can grasp it with a finger. The handle portion 70 is preferably a resin molded product obtained by injection molding or the like. Examples of the resin include polyolefin-based resins such as polyethylene and polypropylene, polycarbonate-based resins, and (meth) acrylic-based resins. Of these resins, transparent resins such as polycarbonate and polymethyl methacrylate are preferable. As a result, the inside of the handle portion 70 can be easily seen, and the wire can be easily inserted.
 カテーテル1は、図7に示す通り、補強部14の近位端部14bの外側面を被覆し、且つ近位側に延在して非補強部17のテーパ部17Tを形成する樹脂製のスリーブ18を備えることが好ましい。補強部14の近位端14Bは、補強部材12が外側に向かって変形し易い部分であるが、樹脂製のスリーブ18により補強部14の近位端部14bを被覆することにより、上記変形を防止し易くすることができる。なおスリーブ18の遠位端部の内側面は、加熱溶融等によって補強部14の近位端部14bの外側面と接合されていることが好ましい。 As shown in FIG. 7, the catheter 1 is a resin sleeve that covers the outer surface of the proximal end portion 14b of the reinforcing portion 14 and extends to the proximal side to form the tapered portion 17T of the non-reinforcing portion 17. It is preferable to provide 18. The proximal end 14B of the reinforcing portion 14 is a portion where the reinforcing member 12 is easily deformed toward the outside, but the above deformation can be achieved by covering the proximal end portion 14b of the reinforcing portion 14 with a resin sleeve 18. It can be easily prevented. It is preferable that the inner surface of the distal end portion of the sleeve 18 is joined to the outer surface of the proximal end portion 14b of the reinforcing portion 14 by heating and melting or the like.
 補強部14の近位端14Bからスリーブ18の遠位端18Aまでの軸方向の長さ(以下では、単に被覆長と呼ぶ場合がある)は、第1筒状部材10の補強部14の近位端14Bから遠位側に1mm離れた位置14Cにおける内径aの2倍以上、35倍以下であることが好ましい。被覆長が内径aの2倍以上であることにより、補強部14の近位端部14bの変形を防止し易くすることができる。そのため、被覆長は内径aの3倍以上であることがより好ましく、内径aの4倍以上であることが更に好ましい。一方、被覆長が内径aの35倍以下であることにより、スリーブ18の遠位端18A近傍を第1内腔71内に例えば接着剤73等を用いて固定する場合に、遠位端18Aのアンカー効果が発揮されて軸方向に働く力に対する耐久性が向上し易くなる。そのため、被覆長は内径aの28倍以下であることがより好ましく、内径aの20倍以下であることが更に好ましく、内径aの15倍以下であることが更により好ましく、内径aの10倍以下であることが特に好ましい。 The axial length from the proximal end 14B of the reinforcing portion 14 to the distal end 18A of the sleeve 18 (hereinafter, may be simply referred to as the covering length) is close to the reinforcing portion 14 of the first tubular member 10. It is preferably twice or more and 35 times or less the inner diameter a at the position 14C 1 mm away from the position end 14B on the distal side. When the coating length is twice or more the inner diameter a, it is possible to easily prevent deformation of the proximal end portion 14b of the reinforcing portion 14. Therefore, the coating length is more preferably 3 times or more the inner diameter a, and further preferably 4 times or more the inner diameter a. On the other hand, when the coating length is 35 times or less of the inner diameter a, the vicinity of the distal end 18A of the sleeve 18 is fixed in the first cavity 71 using, for example, an adhesive 73, the distal end 18A The anchor effect is exerted and the durability against the force acting in the axial direction is easily improved. Therefore, the coating length is more preferably 28 times or less of the inner diameter a, further preferably 20 times or less of the inner diameter a, further preferably 15 times or less of the inner diameter a, and 10 times the inner diameter a. The following is particularly preferable.
 スリーブ18は、熱可塑性樹脂を含むことが好ましい。スリーブ18に含まれる熱可塑性樹脂としては、外層13に含まれる樹脂と同じ樹脂を含んでいることがより好ましい。 The sleeve 18 preferably contains a thermoplastic resin. It is more preferable that the thermoplastic resin contained in the sleeve 18 contains the same resin as the resin contained in the outer layer 13.
 図7に示すようなスリーブ18を形成する方法として、例えば、補強部材を含む筒状体の一端部に、樹脂製のスリーブの一端部を被覆し、次いでテーパ部を有する金属体を加熱して、スリーブの他端部から一端部に向かって、金属体を挿入する方法が挙げられる。 As a method of forming the sleeve 18 as shown in FIG. 7, for example, one end of a tubular body including a reinforcing member is covered with one end of a resin sleeve, and then a metal body having a tapered portion is heated. , A method of inserting a metal body from the other end of the sleeve toward one end can be mentioned.
 本願は、2019年6月19日に出願された日本国特許出願第2019-114065号に基づく優先権の利益を主張するものである。2019年6月19日に出願された日本国特許出願第2019-114065号の明細書の全内容が、本願に参考のため援用される。 This application claims the benefit of priority based on Japanese Patent Application No. 2019-114065 filed on June 19, 2019. The entire contents of the specification of Japanese Patent Application No. 2019-114065 filed on June 19, 2019 are incorporated herein by reference.
 1 カテーテル
 10 第1筒状部材
 10b 第1筒状部材の近位端部
 10A 第1筒状部材の遠位端
 10B 第1筒状部材の近位端
 11 内層
 12 補強部材
 13 外層
 14 補強部
 14A 補強部の遠位端
 14B 補強部の近位端
 14C 補強部の近位端から遠位側に1mm離れた位置
 14b 補強部の近位端部
 15 延在部
 15A 延在部の遠位端
 15O 開口部
 15OA 開口部の遠位端
 15OB 開口部の近位端
 15T テーパ部
 16 ***部
 17 非補強部
 17B 非補強部の近位端
 17T 非補強部のテーパ部
 18 スリーブ
 18A スリーブの遠位端
 19 金属補強線
 20 第2筒状部材
 20A 第2筒状部材の遠位端
 20B 第2筒状部材の近位端
 31 第1のX線不透過性マーカー
 32 第2のX線不透過性マーカー
 50 先端屈曲ワイヤ
 70 ハンドル部
 71 第1内腔
 72 第2内腔
 71B 第1内腔の近位端
 72A 第2内腔の遠位端
 72T 第2内腔のテーパ部
 73 接着剤
 74 流体注入用の貫通孔
 75 接着剤注入用の貫通孔
 100 第1外側筒状部材
 200 第2外側筒状部材
 200B 第2外側筒状部材の近位端
 200b 第2外側筒状部材の近位端部
 300  樹脂製の円柱状体
1 Catheter 10 1st tubular member 10b Proximal end of 1st tubular member 10A Proximal end of 1st tubular member 10B Proximal end of 1st tubular member 11 Inner layer 12 Reinforcing member 13 Outer layer 14 Reinforcing part 14A Distal end of reinforcement 14B Proximal end of reinforcement 14C Proximal end of reinforcement 1mm away from proximal end 14b Proximal end of reinforcement 15 Proximal 15A Distal end of extension 15O Opening 15OA Distal end of opening 15OB Proximal end of opening 15T Tapered 16 Raised 17 Non-reinforcing 17B Proximal end of non-reinforcing 17T Tapered non-reinforced 18 Sleeve 18A Distal end of sleeve 19 Metal reinforcement wire 20 Second tubular member 20A Distal end of second tubular member 20B Proximal end of second tubular member 31 First X-ray opaque marker 32 Second X-ray opaque marker 50 Tip bending wire 70 Handle part 71 1st lumen 72 2nd lumen 71B Proximal end of 1st lumen 72A Distal end of 2nd lumen 72T Tapered part of 2nd lumen 73 Adhesive 74 For fluid injection Through hole 75 Through hole for injecting adhesive 100 1st outer tubular member 200 2nd outer tubular member 200B Proximal end of 2nd outer tubular member 200b Proximal end of 2nd outer tubular member 300 Made of resin Cylindrical body

Claims (16)

  1.  長手方向に延び、遠位端と近位端とを有し、ワイヤが挿入される第1筒状部材と、
     遠位端と近位端とを有し、前記第1筒状部材と径方向に隣接する第2筒状部材とを備え、
     前記第1筒状部材の遠位端は、前記第2筒状部材の遠位端よりも近位側に位置し、
     前記第1筒状部材の近位端は、前記第2筒状部材の近位端よりも近位側に位置し、
     前記第1筒状部材は、ポリテトラフルオロエチレン、及びテトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体よりなる群から選択される少なくとも1種を含む内層と補強部材とを有する補強部を有し、
     前記第1筒状部材は、前記補強部の遠位端よりも遠位側には前記ポリテトラフルオロエチレンと前記テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体と前記補強部材とを含まない樹脂製の延在部を有するカテーテル。
    A first tubular member that extends longitudinally, has a distal end and a proximal end, and into which a wire is inserted.
    It has a distal end and a proximal end, and includes the first tubular member and a second tubular member that is radially adjacent.
    The distal end of the first tubular member is located proximal to the distal end of the second tubular member.
    The proximal end of the first tubular member is located proximal to the proximal end of the second tubular member.
    The first tubular member has a reinforcing portion having an inner layer containing at least one selected from the group consisting of polytetrafluoroethylene and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer and a reinforcing member.
    The first tubular member is made of a resin that does not contain the polytetrafluoroethylene, the tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and the reinforcing member on the distal side of the distal end of the reinforcing portion. Catheter with an extension of.
  2.  前記第1筒状部材の前記補強部の遠位端から前記延在部の遠位端までの軸方向の長さは、前記補強部の遠位端における内径の4倍以上、35倍以下の長さである請求項1に記載のカテーテル。 The axial length from the distal end of the reinforcing portion of the first tubular member to the distal end of the extending portion is 4 times or more and 35 times or less the inner diameter at the distal end of the reinforcing portion. The catheter according to claim 1, which is the length.
  3.  前記第1筒状部材の前記補強部の近位端は、前記第2筒状部材の近位端よりも近位側に位置する請求項1または2に記載のカテーテル。 The catheter according to claim 1 or 2, wherein the proximal end of the reinforcing portion of the first tubular member is located proximal to the proximal end of the second tubular member.
  4.  前記第1筒状部材の前記補強部の近位端は、前記第1筒状部材の近位端よりも遠位側に位置する請求項1~3のいずれかに記載のカテーテル。 The catheter according to any one of claims 1 to 3, wherein the proximal end of the reinforcing portion of the first tubular member is located distal to the proximal end of the first tubular member.
  5.  更に長手方向を有する第1外側筒状部材を備え、前記第1外側筒状部材の内腔に前記第1筒状部材と前記第2筒状部材が配置されている請求項1~4のいずれかに記載のカテーテル。 Any of claims 1 to 4, further comprising a first outer tubular member having a longitudinal direction, wherein the first tubular member and the second tubular member are arranged in a lumen of the first outer tubular member. The catheter described in the crab.
  6.  前記第1筒状部材と前記第2筒状部材の外側面は、軸方向に延びる樹脂製の円柱状体により封止されている請求項1~4のいずれかに記載のカテーテル。 The catheter according to any one of claims 1 to 4, wherein the first tubular member and the outer surface of the second tubular member are sealed by a resin columnar body extending in the axial direction.
  7.  前記第1筒状部材の前記延在部は、遠位側に開口部を有し、前記開口部は、テーパ面と外側面とを備えるテーパ部を有する請求項1~6のいずれかに記載のカテーテル。 The extension portion of the first tubular member has an opening on the distal side, and the opening has a tapered portion including a tapered surface and an outer surface, according to any one of claims 1 to 6. Catheter.
  8.  前記第1筒状部材は、前記開口部よりも遠位側に、前記第2筒状部材とは反対側に向かって***している***部を有する請求項7に記載のカテーテル。 The catheter according to claim 7, wherein the first tubular member has a raised portion that is distal to the opening and is raised toward the side opposite to the second tubular member.
  9.  前記第2筒状部材は、前記補強部の遠位端よりも遠位側の位置に、X線不透過性マーカーが配置されている請求項1~8のいずれかに記載のカテーテル。 The catheter according to any one of claims 1 to 8, wherein the second tubular member has an X-ray opaque marker arranged at a position distal to the distal end of the reinforcing portion.
  10.  前記第2筒状部材は、前記補強部の遠位端よりも遠位側の位置に、X線不透過性マーカーが配置されており、前記X線不透過性マーカーは、前記延在部の遠位側の開口部の遠位端よりも遠位側に位置する請求項7または8に記載のカテーテル。 In the second tubular member, an X-ray opaque marker is arranged at a position distal to the distal end of the reinforcing portion, and the X-ray opaque marker is the extending portion. The catheter according to claim 7 or 8, which is located distal to the distal end of the distal opening.
  11.  更に前記第2筒状部材の近位端よりも近位側に、長手方向を有する第2外側筒状部材を備え、
     前記第2外側筒状部材の内腔に前記第1筒状部材が配置されている請求項1~10のいずれかに記載のカテーテル。
    Further, a second outer tubular member having a longitudinal direction is provided on the proximal side of the proximal end of the second tubular member.
    The catheter according to any one of claims 1 to 10, wherein the first tubular member is arranged in the lumen of the second outer tubular member.
  12.  前記第1筒状部材の外側面は、軸方向に沿って金属補強線を備える請求項1~11のいずれかに記載のカテーテル。 The catheter according to any one of claims 1 to 11, wherein the outer surface of the first tubular member is provided with a metal reinforcing wire along the axial direction.
  13.  前記第1筒状部材は、外層を備える請求項1~12のいずれかに記載のカテーテル。 The catheter according to any one of claims 1 to 12, wherein the first tubular member includes an outer layer.
  14.  前記外層は、低密度ポリエチレン、ポリウレタン、ポリアミドエラストマー、及びポリアミドからなる群より選ばれる少なくとも1種を含む請求項13に記載のカテーテル。 The catheter according to claim 13, wherein the outer layer contains at least one selected from the group consisting of low-density polyethylene, polyurethane, polyamide elastomer, and polyamide.
  15.  前記第1筒状部材の近位端部には、ハンドル部が接続されている請求項1~14のいずれかに記載のカテーテル。 The catheter according to any one of claims 1 to 14, wherein a handle portion is connected to the proximal end portion of the first tubular member.
  16.  前記延在部を構成する樹脂は、低密度ポリエチレン、ポリウレタン、ポリアミドエラストマー、及びポリアミドからなる群より選ばれる少なくとも1種である請求項1~15のいずれかに記載のカテーテル。 The catheter according to any one of claims 1 to 15, wherein the resin constituting the extending portion is at least one selected from the group consisting of low-density polyethylene, polyurethane, polyamide elastomer, and polyamide.
PCT/JP2020/022152 2019-06-19 2020-06-04 Catheter WO2020255737A1 (en)

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WO2006126642A1 (en) * 2005-05-26 2006-11-30 Kaneka Corporation Catheter
JP2007130116A (en) * 2005-11-09 2007-05-31 Kaneka Corp Catheter
JP2007520281A (en) * 2004-01-29 2007-07-26 イコス コーポレイション Small vessel ultrasound catheter
JP2013153892A (en) * 2012-01-30 2013-08-15 Goodman Co Ltd Catheter
JP2015156956A (en) * 2014-02-24 2015-09-03 朝日インテック株式会社 catheter
WO2018008272A1 (en) * 2016-07-04 2018-01-11 株式会社カネカ Catheter

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Publication number Priority date Publication date Assignee Title
AU2011376737B2 (en) * 2011-09-12 2017-04-27 Stryker European Operations Holdings Llc Methods of manufacturing flexible polymeric medical spiral tubings, tubings made by the methods and uses of the tubings

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JP2007520281A (en) * 2004-01-29 2007-07-26 イコス コーポレイション Small vessel ultrasound catheter
WO2006126642A1 (en) * 2005-05-26 2006-11-30 Kaneka Corporation Catheter
JP2007130116A (en) * 2005-11-09 2007-05-31 Kaneka Corp Catheter
JP2013153892A (en) * 2012-01-30 2013-08-15 Goodman Co Ltd Catheter
JP2015156956A (en) * 2014-02-24 2015-09-03 朝日インテック株式会社 catheter
WO2018008272A1 (en) * 2016-07-04 2018-01-11 株式会社カネカ Catheter

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