CN113908403B

CN113908403B - Intracranial catheter

Info

Publication number: CN113908403B
Application number: CN202111529189.XA
Authority: CN
Inventors: 高洪亮; 吕怡然; 抗超; 李玉桐
Original assignee: Aike Medical Devices Beijing Co ltd
Current assignee: Eco Medical Devices (Beijing) Co.,Ltd.
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-03-29
Anticipated expiration: 2041-12-15
Also published as: CN113908403A

Abstract

The invention discloses an intracranial catheter which comprises a catheter body, a conical buffer tube and a catheter seat, wherein the catheter body is internally connected into a conical part of the catheter seat, the conical buffer tube is sleeved at the near end of the catheter body and outside the conical part of the catheter seat, and the catheter body comprises a metal laser engraving pattern part, a spiral cutting part and a metal catheter part which are sequentially connected. The catheter has the advantages that: because the pipe body adopts the structure that the metal laser engraving pattern part, the spiral cutting part and the metal pipe part are combined, the axial shrinkage is small, the flexibility of the far end and the cavity of the pipe cavity are ensured, and the synchronism of the operation of the near end and the far end of the catheter is also improved.

Description

Intracranial catheter

Technical Field

The invention relates to the field of medical instruments, in particular to an intracranial catheter.

Background

Intravascular devices such as catheters are often used in the medical field. Catheters are typically inserted into a patient's femoral artery, radial artery, carotid artery, or jugular vein and are passed through a patient's blood vessel to reach the heart, brain, or other target anatomy. Typically, a guidewire is first guided to the target anatomy, and one or more catheters are then passed over the guidewire and guided to the target anatomy. Once in place, the catheter may be used to deliver drugs, stents, embolic devices, radiopaque dyes, or other devices or substances for treating the patient in a desired manner. In other cases, the catheter and guidewire are delivered simultaneously toward the target anatomy while the guidewire is within the catheter, and then the guidewire is further delivered into the anatomy by translation within the catheter.

In many applications, the catheter needs to travel through a tortuous vessel to an anatomical site, which requires that the intravascular catheter have good pressure resistance, strong torque, pushability, strong resistance to bending, and timely responsiveness. One medical catheter of the prior art (as shown in fig. 1) includes a tube body 1, a tapered buffer tube 2 and a hub 3, wherein the tube body is inscribed within the tapered section 30 of the hub and the tapered buffer tube 2 is sleeved at the proximal end 130 of the tube body and outside the tapered section 30 of the hub. The tapered buffer tube helps to prevent the catheter from bending at the junction of the tube body and the tube base during use. The pipe body and the pipe seat are fixed together in an adhesive mode. The conical buffer tube is fixed with the tube seat in an interference fit or bonding mode.

Intracranial catheters generally require a flexible distal body, a large inner diameter and a small outer diameter. Intracranial catheters are generally catheters with metal reinforcing layers, so that the catheter body is prevented from being bent, the lumen is prevented from being lost, and force is transmitted to the far end of the catheter through the near end of the catheter during operation. The metal reinforcement layer is typically a woven or wound wire structure. In addition, the macromolecule layer of the catheter body at the far end of the catheter is made of soft and elastic macromolecule materials, such as block polyether amide resin, thermoplastic polyurethane elastomer rubber and the like, so that the far end catheter body of the catheter is stretched to deform when the far end resistance is large during clinical use, the catheter body at the far end of the catheter is lost, and the far end of the catheter is difficult to position. Meanwhile, the buffer tube can play a role in buffering, but still needs to be in a split structure with the catheter base and the catheter body to be matched for use. Because of the matching assembly part, the joint between the pipe body and the pipe seat has certain requirements, if the matching is not good, for example, the gap between the pipe body and the buffer pipe is large, for example, the matching part of the buffer pipe and the farthest end of the pipe seat is not tight enough, a large gap exists, and in the using process, the condition that the stress concentration at the near end of the pipe body is caused, so that the pipe body is damaged still exists.

The invention aims to provide an intracranial catheter, which can overcome the problems of poor matching degree of the existing intracranial catheter and a tube seat, easy bending of a far end, reduction of a lumen and poor synchronism of the near end and the far end.

Disclosure of Invention

The present application seeks to provide an intracranial catheter which overcomes the disadvantages of the prior art. The application is realized through the following technical scheme.

One embodiment of the present invention provides an intracranial catheter comprising a tube body, a tapered buffer tube, and a tube holder, wherein the tube body is inscribed within a tapered portion of the tube holder, and the tapered buffer tube is sleeved at a proximal end of the tube body and outside the tapered portion of the tube holder, wherein the tube body comprises a metal laser engraved flower portion, a spiral cut portion, and a metal tube portion that are connected in sequence.

According to the intracranial catheter provided by the above one embodiment of the invention, the tube further comprises a tip, and the tip is connected with the metal laser-engraved pattern part.

According to one embodiment of the present invention, there is provided an intracranial catheter wherein the tip is plated with gold, platinum, iridium, or an alloy thereof.

According to the intracranial guide tube provided by the above one embodiment of the invention, the metal laser engraved pattern portion comprises a plurality of axially parallel straight engraved metal wires and a plurality of sine-shaped engraved wires, each sine-shaped engraved wire extends between two adjacent axially parallel straight engraved metal wires, and the wave crests and the wave troughs of two adjacent sine-shaped engraved wires are opposite.

According to the present invention, there is provided an intracranial catheter as described in the above embodiment, wherein the relationship between the length of the helical cutting portion L2 and the length of the flare L1 at the distal end of the lumen of the tube holder is as follows: l2 is more than 2mm and less than L1-1mm, L1 is more than 2mm and less than 30 mm.

According to the present invention, there is provided an intracranial catheter as described in the above embodiment, wherein the spiral cut portion includes an inner polymer layer, a spiral wire reinforcement layer, and an outer polymer layer.

According to the intracranial catheter provided by the above one embodiment of the invention, the metal tube comprises a polymer inner layer, a metal tube middle layer and a polymer outer layer.

According to the intracranial catheter provided by the above one embodiment of the invention, the metal laser engraved pattern part comprises a polymer inner layer, a metal laser engraved pattern reinforced middle layer and a polymer outer layer.

According to the intracranial catheter provided by the above one embodiment of the invention, the wire is a round wire or a flat wire.

According to the intracranial catheter provided by the above one embodiment of the invention, the wire is made of nickel-titanium alloy, cobalt-chromium alloy, platinum-tungsten alloy, stainless steel or composite alloy.

According to the invention, the intracranial catheter is provided, wherein the metal laser engraving pattern reinforcing middle layer is engraved on the cylindrical metal pipe according to the design pattern by laser.

According to the present invention, there is provided an intracranial catheter as described in the above one embodiment, wherein the laser engraved metal pattern reinforcing intermediate layer is engraved by laser on the metal plate in accordance with a design pattern, and the metal plate engraved with the design pattern is welded to form a cylindrical metal tube.

According to the present invention, there is provided an intracranial catheter as described above, wherein the helical cutting portion and the metal tube portion are inserted into the distal flare of the lumen of the tube holder.

According to the invention, the intracranial catheter is provided, wherein the tip is provided with the developing coating, and the developing coating is realized by coating, electroplating or chemical plating.

According to one embodiment of the present invention, there is provided an intracranial catheter wherein the tip is a visualization ring.

According to the intracranial guide tube provided by the above one embodiment of the invention, the metal laser engraved pattern part, the spiral cutting part and the metal tube part all comprise a polymer inner layer, a reinforcing middle layer and a polymer outer layer, wherein the reinforcing middle layer is processed by one metal tube to form the laser engraved pattern reinforcing middle layer, the spiral metal wire reinforcing layer and the metal tube middle layer.

The intracranial catheter has the advantages that as the catheter body adopts a structure of combining the metal laser engraved pattern part, the spiral cutting part and the metal tube part, the axial shrinkage is small, the flexibility of the far end and the lumen cavity are ensured, and the synchronism of the operation of the near end and the far end of the catheter is improved.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings.

Fig. 1 shows an intracranial catheter of the prior art.

Fig. 2 shows a cross-sectional view of an intracranial catheter, according to one embodiment of the invention.

Fig. 3 shows an axial cross-sectional view of a tube of an intracranial catheter, according to one embodiment of the invention.

Fig. 4 shows a schematic deployment view of a metal laser engraved textured portion of an intracranial catheter tube according to one embodiment of the invention.

FIG. 5 shows a schematic representation of the helical cut length of an intracranial catheter tube and the flare length distal to the hub lumen, according to one embodiment of the invention.

Figure 6 shows a radial cross-section of the body of a catheter of the prior art.

Fig. 7 shows a radial partial cross-sectional view of a metal tube portion of an intracranial catheter tube according to one embodiment of the invention.

Reference numbers and part names: 1-tube body, 2-tapered buffer tube, 3-tube seat, 10-end, 11-metal laser engraved pattern part, 12-spiral cutting part, 13-metal tube part, 30-tapered part, 31-tube seat near end bell mouth, 100-high polymer inner layer, 101-metal tube middle layer, 102-high polymer outer layer, 103-reinforced middle layer, 110-axially parallel straight line engraved metal wire, 111-sine-shaped engraved wire, 130-tube body near end, L1-tube seat inner cavity far end bell mouth length, and L2-spiral cutting part length.

Detailed Description

The following description of the embodiments of the present application with reference to the drawings and examples will make it apparent to those skilled in the art that the technical problems, technical solutions and technical effects of the present application can be easily solved through the contents described in the present specification. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. In addition, for convenience of description, only portions related to the related invention are shown in the drawings.

It should be noted that the structures, proportions, sizes, and other elements shown in the drawings are only used for understanding and reading the contents of the specification, and are not used for limiting the conditions under which the present application can be implemented, so they do not have the technical significance, and any structural modifications, changes in proportion, or adjustments of sizes, which do not affect the efficacy and achievement of the purposes of the present application, shall still fall within the scope of the technical content disclosed in the present application.

Reference herein to words such as "first," "second," "the," and the like do not denote a limitation of quantity, but rather denote the singular or plural. The present application is directed to the terms "comprising," "including," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

Reference herein to "a plurality" means greater than or equal to two. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.

Fig. 2 shows a cross-sectional view of an intracranial catheter, according to one embodiment of the invention. Fig. 3 shows an axial cross-sectional view of a tube of an intracranial catheter, according to one embodiment of the invention. Referring to the prior art as shown in fig. 1, an intracranial catheter, as shown in fig. 2-3, comprises a tube body 1, a tapered buffer tube and a hub 3, wherein the tube body 1 is inscribed within a tapered section 30 of the hub 3, and the tapered buffer tube is sleeved at the proximal end of the tube body and outside the tapered section 30 of the hub.

As shown in fig. 3, a tube body 1 of an intracranial catheter according to one embodiment of the invention includes a tip 10, a metal laser-engraved patterned portion 11, a spiral cut portion 12, and a metal tube portion 13, which are connected in this order. The tip 10 may be plated with gold, platinum, iridium or an alloy thereof, and the tip may perform a developing function without using a developing ring alone.

Fig. 5 shows a schematic deployment view of a metal laser engraved textured portion of an intracranial catheter tube according to one embodiment of the invention. As shown in fig. 5, the metal laser engraved pattern portion 11 includes a plurality of axially parallel straight engraved metal wires 110 and a plurality of sine-shaped engraved metal wires 111, each sine-shaped engraved metal wire 111 extends between two adjacent axially parallel straight engraved metal wires 110, and peaks and valleys of two adjacent sine-shaped engraved metal wires 111 are opposite to each other. The metal laser engraving pattern part comprises a polymer inner layer, a metal laser engraving pattern reinforcing middle layer and a polymer outer layer. The metal laser engraving pattern reinforcing middle layer is formed by engraving laser on a cylindrical metal pipe according to design patterns. The metal laser engraving pattern reinforcing middle layer is engraved on the metal plate according to the design pattern by laser, and the metal plate engraved with the design pattern forms a cylindrical metal pipe through welding.

The pipe body of the intracranial catheter adopting the metal laser carving pattern part has the advantages that: the sine-shaped carving wires can ensure the tube cavity of the tube body in the radial direction, so that the catheter has the bending resistance and the anti-kink performance. The straight line carving silk can ensure that the high pipe body does not generate axial stretching deformation in the axial direction, so that the end head 10 is fixed in position. The straight engraving wires facilitate a more direct transfer of the force of the proximal end of the catheter to the distal end of the catheter.

FIG. 4 shows a schematic representation of the helical cut length of an intracranial catheter tube and the flare length distal to the hub lumen, according to one embodiment of the invention. As shown in FIG. 4, the partial helical cut 12 and the metal tube portion 13 are inserted into the proximal flare 31 of the tube holder, and the relationship between the helical cut length L2 and the distal flare length L1 of the lumen of the tube holder is as follows: l2 is more than 2mm and less than L1-1mm, L1 is more than 2mm and less than 30 mm. The spiral cutting part can be used independently or matched with a buffer tube, so that the bending resistance of the catheter is improved. The spiral cutting part comprises a high polymer inner layer, a spiral metal wire reinforcing layer and a high polymer outer layer. The metal wire is made of nickel-titanium alloy, cobalt-chromium alloy, platinum-tungsten alloy, stainless steel and composite alloy.

The tube body in the prior art comprises a polymer inner layer 100, a reinforcing middle layer 103 adopting weaving and filament winding and a polymer outer layer 102, and in the process of processing, cutting is needed, so that the near end of the tube body is deformed, and the cut section is not completely flush. The proximal end of the tube made of metal wires is an end face structure (as shown in fig. 6) in which the metal wire end and the polymer layer are alternated. Such proximal tips are susceptible to dimensional variations when mated with a hub. The proximal end of the catheter and hub do not fit tightly and tend to jam there when used to deliver other instruments. Fig. 7 shows a radial partial cross-sectional view of a metal tube portion of an intracranial catheter tube according to one embodiment of the invention. As shown in FIG. 7, the metal tube part 13 comprises a polymer inner layer 100, a metal tube middle layer 101 and a polymer outer layer 102, the metal tube part 13 is adopted at the proximal end of the tube body, the tube body is not deformed during cutting, the end face is not cut to be flush, the tube body is tightly matched with the tube seat, and when the metal tube part is used for conveying other instruments, the tube body is not blocked at the position.

In embodiments of the present invention, a tapered buffer tube may be used as the prior art tapered buffer tube shown in FIG. 1.

In one embodiment of the invention, the terminal has a developing coating, and the developing coating is realized by coating, electroplating and chemical plating. In another embodiment according to the present invention, the head is a developer ring.

According to another embodiment of the present invention, there is provided an intracranial catheter wherein the metal laser-engraved pattern portion, the spiral cutting portion, and the metal tube portion each include an inner polymer layer, an intermediate reinforcing layer, and an outer polymer layer, wherein the intermediate reinforcing layer is formed by processing a single metal tube to form the intermediate laser-engraved pattern reinforcing layer, the spiral wire reinforcing layer, and the intermediate metal tube layer.

The intracranial catheter has the advantages that the catheter body adopts the structure of the metal laser engraved pattern part, the spiral cutting part and the metal tube part, the axial contraction is small, the flexibility of the far end and the lumen cavity are ensured, and the synchronism of the operation of the near end and the far end of the catheter is improved.

While the present application has been described and illustrated with reference to particular embodiments thereof, such description and illustration are not intended to limit the present application. It will be clearly understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof within the embodiments without departing from the true spirit and scope of the present application as defined by the appended claims. The illustrations may not be drawn to scale. There may be a difference between the technical reproduction in the present application and the actual device due to variables in the manufacturing process and the like. There may be other embodiments of the application that are not specifically illustrated. The specification and drawings are to be regarded in an illustrative rather than a restrictive sense. Modifications may be made to adapt a particular situation, material, composition of matter, method, or process to the objective, spirit and scope of the present application. All such modifications are intended to be within the scope of the claims appended hereto. Although the methods disclosed herein have been described with reference to particular operations performed in a particular order, it should be understood that these operations may be combined, sub-divided, or reordered to form equivalent methods without departing from the teachings of the present application. Accordingly, unless specifically indicated herein, the order and grouping of the operations is not a limitation of the present application.

Claims

1. An intracranial catheter comprises a catheter body, a conical buffer tube and a catheter seat, wherein the catheter body is internally connected into a conical part of the catheter seat, and the conical buffer tube is sleeved at the near end of the catheter body and outside the conical part of the catheter seat;

the metal laser engraving pattern part comprises a plurality of axial parallel linear engraving metal wires and a plurality of sine-shaped engraving wires, each sine-shaped engraving wire extends between two adjacent linear engraving metal wires, and the wave crests and the wave troughs of the two adjacent sine-shaped engraving wires are opposite; the pipe body pipe cavity is guaranteed in the radial direction through sine carving, the guide pipe has bending resistance and anti-kink performance, and the pipe body is not subjected to axial stretching deformation in the axial direction through the straight carving wires.

2. The intracranial catheter as recited in claim 1, wherein the tube further comprises a tip, the tip being connected to the laser engraved metal pattern.

3. The intracranial catheter as recited in claim 2, wherein the tip is electroplated with gold, platinum, iridium, or an alloy of gold, platinum, and iridium.

4. The intracranial catheter as recited in claim 1, wherein the relationship between the helical cut length L2 and the flare length L1 distal to the lumen of the hub is as follows: the spiral cutting part is more than 2mm and less than L2 and less than L1-1mm, and the spiral cutting part is more than 2mm and less than L1 and less than 30 mm.

5. The intracranial catheter as recited in claim 4, wherein the spiral cut comprises an inner polymeric layer, a spiral wire reinforcement layer, and an outer polymeric layer.

6. The intracranial catheter as recited in claim 1, wherein the metal tube portion comprises an inner polymeric layer, an intermediate metal tube layer, and an outer polymeric layer.

7. The intracranial catheter as recited in claim 1, wherein the laser-engraved metal pattern comprises an inner polymeric layer, a laser-engraved metal pattern-reinforced intermediate layer, and an outer polymeric layer.

8. The intracranial catheter as recited in claim 5, wherein the wire is a round or flat wire.

9. The intracranial catheter as recited in claim 5, wherein the wire is formed from a nickel-titanium alloy, a cobalt-chromium alloy, a platinum-tungsten alloy, stainless steel, or a composite alloy.

10. The intracranial catheter as recited in claim 7, wherein the metal laser-engraved pattern reinforcing intermediate layer is laser-engraved in the cylindrical metal tube according to a design pattern.

11. The intracranial catheter as recited in claim 7, wherein the laser engraved metallic pattern reinforcing intermediate layer is laser engraved in the metallic plate according to a design pattern, and the patterned metallic plate is welded to form a cylindrical metallic tube.

12. The intracranial catheter as recited in claim 1, wherein the helical cutting portion and the metal tube portion are inserted into the distal flare of the lumen of the tube holder.

13. The intracranial catheter as recited in claim 2, wherein the tip has a developable coating applied thereto by coating, electroplating, or electroless plating.

14. The intracranial catheter as recited in claim 2, wherein the tip is a visualization ring.

15. The intracranial catheter as recited in claim 1, wherein the laser engraved metal pattern, the helical cutting portion, and the metal tube portion each comprise an inner polymer layer, an intermediate reinforcing layer, and an outer polymer layer, wherein the intermediate reinforcing layer is formed by machining a metal tube to form the laser engraved pattern intermediate reinforcing layer, the helical wire reinforcing layer, and the intermediate metal tube layer.