WO2015198734A1 - カテーテル、カテーテル製造用金型、カテーテルの製造方法 - Google Patents
カテーテル、カテーテル製造用金型、カテーテルの製造方法 Download PDFInfo
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- WO2015198734A1 WO2015198734A1 PCT/JP2015/063747 JP2015063747W WO2015198734A1 WO 2015198734 A1 WO2015198734 A1 WO 2015198734A1 JP 2015063747 W JP2015063747 W JP 2015063747W WO 2015198734 A1 WO2015198734 A1 WO 2015198734A1
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- Prior art keywords
- tube
- catheter
- inner tube
- branch
- lumen
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
- A61M25/0026—Multi-lumen catheters with stationary elements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M25/00—Catheters; Hollow probes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M25/00—Catheters; Hollow probes
- A61M25/0009—Making of catheters or other medical or surgical tubes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/76—Cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14008—Inserting articles into the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14549—Coating rod-like, wire-like or belt-like articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
- B29C45/14614—Joining tubular articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14836—Preventing damage of inserts during injection, e.g. collapse of hollow inserts, breakage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/261—Moulds having tubular mould cavities
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
- A61M25/0026—Multi-lumen catheters with stationary elements
- A61M2025/0037—Multi-lumen catheters with stationary elements characterized by lumina being arranged side-by-side
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
- A61M25/0026—Multi-lumen catheters with stationary elements
- A61M2025/0039—Multi-lumen catheters with stationary elements characterized by lumina being arranged coaxially
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
- A61M25/1027—Making of balloon catheters
- A61M25/1036—Making parts for balloon catheter systems, e.g. shafts or distal ends
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14008—Inserting articles into the mould
- B29C2045/14057—Inserting articles into the mould feeding inserts wrapped on a core
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/24—Pipe joints or couplings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
- B29L2031/7542—Catheters
Definitions
- the present invention relates to a catheter, a catheter manufacturing die, and a catheter manufacturing method.
- This application claims priority based on Japanese Patent Application No. 2014-133187 for which it applied to Japan on June 27, 2014, and uses the content here.
- Examples of treatment tools for treating a living body include catheters used in endoscopes and the like (see, for example, Patent Documents 1 to 3).
- the catheter has, for example, a plurality of lumens, and a plurality of ducts over almost the entire length.
- a balloon catheter or the like at least a part of a plurality of conduits is closed or sealed at one end.
- a catheter in which both ends of the conduit are open is also used.
- the medical balloon catheter described in Patent Document 3 has a balloon attached to the distal end of a flexible tube, and a main passage for feeding a drug such as a contrast medium to the flexible tube, and the balloon A passage for supplying a fluid for inflating the liquid is integrally formed.
- the flexible tube is branched into two tubes individually connected to the main passage and the passage by a branch portion provided on the base end side. Separate bases are attached to the extended ends of the two tubes.
- the main passage and the passage are branched at an appropriate angle with respect to the tube axis direction at the branch portion, and the periphery thereof is covered with a resin such as an adhesive, and the resin is formed into an appropriate shape. Solidified and solidified to form a branched portion.
- the present invention has been made in view of the above circumstances, and aims to achieve the following objects. 1. Make it possible to improve the sealing performance at the bifurcation. 2. It should be possible to manufacture easily without degrading the sealing performance. 3. It is possible to improve the sealing performance even with a coaxial lumen. 4). Reduce costs in catheter manufacturing. 5. To prevent the sheath from collapsing due to the injection pressure when the branch part is outserted.
- the catheter according to the first aspect of the present invention includes a tube portion having a plurality of lumens having a constant outer diameter and extending along an axis inside thereof, and a plurality of lumens on the proximal end side of the tube portion.
- a step is formed at the end of the tube.
- an inner tube in which at least one lumen among the plurality of lumens is formed is provided inside the tube portion, and an end portion of the inner tube is provided.
- the inner tube may be provided only in the vicinity of the inside of the branch portion.
- an inner tube is provided inside the tube portion as the lumen, and the inner tube is disposed inside the outer tube of the tube portion as a coaxial lumen.
- the end portion of the inner tube may be extended toward the proximal end side of the branch portion rather than the end portion of the outer tube inserted into the branch portion.
- the distal end side has a constant outer diameter and a tube portion having a plurality of lumens extending along the axis, and the proximal end portion side of the tube portion And a branch portion that separates the axes of the plurality of lumens so as to be separated from each other, wherein an inner tube is provided inside the tube portion as the lumen, and the inner tube is the coaxial lumen as the tube.
- a catheter provided on the inner side of the outer tube, wherein an end portion of the inner tube is extended toward a proximal end side of the branch portion rather than an end portion of the outer tube inserted into the branch portion.
- An outer die that forms the outer tube, and the insertion portion to be inserted into the outer tube includes an outer surface portion along the inside of the outer tube and an inner surface portion along the outside of the inner tube.
- the inner surface portion is a groove corresponding to the outer shape of the inner tube, the groove of the insertion portion is provided with a terminal end in the length direction, and the first cored bar is branched from the terminal end.
- the outer mold is branched into a Y-shape in which the outer tube, the inner tube, and the first and second core bars inserted therein can be arranged.
- a groove part and the space part which can form the said branch part with these groove parts are arrange
- the cross-sectional shape of the insertion portion of the first cored bar in a direction intersecting the axis may be a substantially crescent shape.
- the second cored bar may have a substantially circular cross-sectional shape in a direction intersecting the axis.
- a method for manufacturing a catheter according to a seventh aspect of the present invention is a method for manufacturing a catheter using the mold described above, the step of inserting the second core bar into the inner tube, and the second core bar. Disposing the inserted inner tube in the groove of the first core, inserting the second core, the inner tube, and the first core into the outer tube, A step of arranging a two-core metal, the inner tube, the first core metal, and the outer tube in the corresponding groove portion of the outer mold, and a step of injecting a resin into the space portion to form the branch portion And releasing the metal mold and removing the core metal.
- the step is formed so that the opening positions of the plurality of lumens are different positions along the axis in the branch portion, even when a void occurs when the branch portion is formed, the sealing performance is improved. It does not deteriorate the characteristics of the catheter as it is maintained. In addition, it is possible to improve the sealing performance at the branch portion, and to reduce the cost in manufacturing the catheter.
- 1 is a perspective view showing a first embodiment of a catheter according to the present invention. It is an expansion perspective view which shows the branch part vicinity in 1st Embodiment of the catheter which concerns on this invention. It is sectional drawing which shows 1st Embodiment of the catheter which concerns on this invention. It is sectional drawing which shows 1st Embodiment of the catheter which concerns on this invention. It is sectional drawing which shows 1st Embodiment of the catheter which concerns on this invention. It is sectional drawing which shows 1st Embodiment of the catheter which concerns on this invention. It is sectional drawing which shows 1st Embodiment of the catheter which concerns on this invention. It is a top view which shows 1st Embodiment of the metal mold
- FIG. 1 is a perspective view showing a catheter in the present embodiment
- FIG. 2 is an enlarged perspective view of FIG. 1
- reference numeral 1 in the figure is a catheter.
- the catheter 1 in this embodiment is a balloon catheter.
- the catheter 1 in the present embodiment has a cylindrical outer tube 2 having flexibility, a balloon 3 attached to the tip of the outer tube 2, and a coaxial shape inside the outer tube 2.
- the cylindrical inner tube 4 provided on the outer tube 2 (the central axis of the outer tube 2 coincides with the central axis of the inner tube 4), and the outer tube 2 and the inner tube 4 on the base end (first end) side.
- a branching portion 6 to be separated.
- the outer tube 2 and the inner tube 4 between the balloon 3 and the branch portion 6 constitute a tube portion 2A.
- a first lumen 5 is formed on the inner side of the outer tube 2 and an outer side of the inner tube 4 on the tip side of the branch portion 6, and similarly, a second lumen 7 is formed in the inner tube 4.
- the outer tube 2 branches from a branch portion 6 provided on the base end side into a tube 8 individually connected to the first lumen 5 and a tube 9 communicating with the second lumen 7.
- Separate bases 4a and 8b are attached to the extended ends of the two tubes 9 and 8, respectively.
- polyethylene resin or the like can be used in consideration of adhesiveness and processability with the balloon 3.
- a vinyl chloride resin (especially soft vinyl chloride resin), a silicone rubber, a polyurethane resin etc. are mentioned, for example.
- the outer tube 2 and the inner tube 4 may be made of different materials, but are preferably made of the same material. Thereby, since the material of the catheter 1 for medical use can be made common, productivity can be improved.
- the inner diameter of the outer tube 2 is not particularly limited, but is preferably 1 to 9 mm, and particularly preferably 2 to 4 mm.
- the outer diameter is not particularly limited, but is preferably 2 to 10 mm, and particularly preferably 3 to 5 mm. When the inner and outer diameters are within the above range, the outer tube 2 that is not bulky and has a low flow resistance when the branch portions are bundled can be configured.
- the inner diameter of the inner tube 4 is not particularly limited, but is preferably 1 to 9 mm, particularly preferably 0.3 to 3 mm.
- the outer diameter is not particularly limited, but is preferably 1 to 5 mm, particularly preferably 1 to 3 mm. When the inner and outer diameters are within the above range, the inner tube 4 that is not bulky when bundled and has low flow resistance can be configured.
- the balloon 3 is a tube manufactured from, for example, polyethylene or nylon, and is provided at the distal end of the catheter 1.
- the first lumen 5 communicates with the balloon 3 and is configured to supply a fluid for inflating the balloon 3.
- the second lumen 7 is open to communicate with the distal end side of the tube portion 2A of the catheter 1, for example.
- the second lumen 7 can be inserted with a guide wire or a stylet, or a contrast medium can be injected into the lumen.
- the first lumen 5 that supplies fluid to the balloon 3 does not reach the distal end portion of the inner tube 4 in the catheter 1.
- the second lumen 7 is positioned in the center.
- the distal end portion of the inner tube 4 is configured to be tapered toward the distal end, and to maintain the thickness of the peripheral edge of the distal end.
- the outer tube 2 and the inner tube 4 are separated so that the shaft is separated.
- the outer tube 2 is fitted into the branch portion 6 as a tube 8 that is a separate member having the same outer diameter as the outer diameter of the outer tube 2 on the proximal side of the branch portion 6.
- the inner tube 4 is fitted into the branch portion 6 as a tube 9 that is a tube material having the same outer diameter as the outer diameter of the inner tube 4 on the proximal end side with respect to the branch portion 6.
- the inner tube 4 may be a tube material that is continuous on the proximal end side and the distal end side of the branch portion 6.
- an opening 5 a of the first lumen 5 is formed at the end portion 2 a of the outer tube 2 that is the proximal end side of the tube portion 2 ⁇ / b> A inserted into the branch portion 6.
- an opening 7 a of the second lumen 7 is formed at the end 4 a of the inner tube 4 that is the proximal end side of the tube 2 A inserted into the branch portion 6.
- the end portion 2a and the end portion 4a form a step.
- the first and second lumens 5 and 7 as flow paths for flowing fluid are not divided by these openings 5a and 7a, but both the outer tube 2 and the inner tube 4 inside the branch portion 6 are pipe materials.
- openings 5a and 7a are formed at the end portions 2a and 4a.
- the outer pipe 2 and the inner side which are set so that the opening 5a and the opening 7a of the first lumen 5 and the second lumen 7 are respectively positioned along different axes (flow path directions), and become the proximal end side of the direction pipe portion 2A. Ends 2a, 4a with the tube 4 are formed.
- the end 2a of the outer tube 2 is set within a range of 5 to 10 mm from the left end position of the branching portion 6, and the end 4a of the inner tube 4 is branched. It is set within a range of 10 to 20 mm from the position of the left end portion of the portion 6. That is, the length that the end 4a of the inner tube 4 extends from the end 2a of the outer tube 2 inward of the branching portion 6 is set in the range of 5 to 15 mm.
- the opening 5a and the opening 7a are set so that the positions along the axis of the inner tube 4 are different within a range of 5 to 15 mm.
- the second lumen 7 formed in the inner tube 4 with respect to the cross-sectional area SA of the first lumen 5 formed at least inside the outer tube 2 and outside the inner tube 4 is cut off.
- the ratio of the area SB (the cross-sectional area SA of the first lumen / the cross-sectional area SB of the second lumen) is set so as not to be equal to or smaller than the value in the pipe portion 2A.
- 3A to 3D are cross-sectional views taken along the arrow in the catheter of the present embodiment. Specifically, at the position indicated by arrows AA in FIG. 1, the longitudinal center axis of the outer tube 2 and the longitudinal center axis of the inner tube 4 are coaxial as shown in FIG. 3A. It is.
- the central axis of the outer tube 2 and the central axis of the inner tube 4 are decentered from the coaxial state, as shown in FIG. 3B. (The center axis of the outer tube 2 and the center axis of the inner tube 4 are shifted).
- the branching portion 6 indicated by arrows CC in FIG. 2 at the position where the central axis of the outer tube 2 and the central axis of the inner tube 4 are separated but not branched, as shown in FIG. 4 is the state which protrudes from the cross-sectional outline of the outer side pipe
- the outer tube 2 and the inner tube 4 are branched from the branch portion 6 indicated by the arrow DD in FIG.
- the lumen 5 is provided with a tube 8 instead of the outer tube 2
- the second lumen 7 is provided with a tube 9 instead of the inner tube 4.
- the inner diameter of the tube 8 is set equal to the inner diameter of the outer tube 2
- the inner diameter of the tube 9 is set equal to the inner diameter of the outer tube 2.
- the length in which the end 4a of the inner tube 4 extends from the end 2a of the outer tube 2 in the branch 6 in the present embodiment toward the inner side of the branch 6 is set within a predetermined range.
- the opening 5a and the opening 7a are set such that positions along the axis of the inner tube 4 are different within the range.
- the mold 10 in the method for manufacturing the catheter 1 of the present embodiment, a mold 10 as shown in FIGS. 4 to 6 is used.
- the mold 10 includes an upper mold (outer mold) 11, a lower mold (outer mold) 12, a thick core metal (first core metal) 13, and a core metal (second core metal) 14. It consists of.
- the inner surface (mating surface) of the upper mold 11 includes a space portion (cavity) 11a constituting a resin molding space serving as the branch portion 6, a first groove 11b in which the distal end side of the outer tube 2 can be disposed, and a base of the outer tube 2
- It has the groove
- the first to fifth grooves (groove parts) 11b to 11f are provided on a reference surface that is substantially in the same plane at a position facing the space part 11a where the branch part 6 can be formed.
- a gate (not shown) for filling the resin constituting the branch portion 6 is provided so as to communicate with the space portion 11a from the side surface portion of the upper mold 11.
- the space portion 11a has a rectangular shape as the branching portion 6, for example, but may have a predetermined shape.
- the inner surface (matching surface) of the lower mold 12 includes a space portion (cavity) 12a constituting a resin molding space serving as the branch portion 6, a first groove 12b in which the distal end side of the outer tube 2 can be disposed, and an outer tube.
- the first to fifth grooves (groove parts) 12b to 12f are provided on a reference surface that is substantially in the same plane at a position facing the space part 12a where the branch part 6 can be formed.
- the first grooves 11 b and 12 b communicate the cavities 11 a and 12 a with the outside of the molds 11 and 12, and the outer pipe 2 is sandwiched between the molds 11 and 12 in a shape corresponding to the outer diameter of the outer pipe 2.
- the inside of the first grooves 11b and 12b is set to be sealed by the outer tube 2.
- the second grooves 11c and 12c extend from the cavities 11a and 12a to the outside of the molds 11 and 12, and are set to have a shape corresponding to the outer diameter of the outer tube 2 or the tube 8,
- One groove 11b, 12b is formed at an extended position.
- the second grooves 11c and 12c have a shape corresponding to the outer diameter of the outer tube 2, and when the outer tube 2 is sandwiched between the molds 11 and 12, the inside of the second grooves 11c and 12c is the outer tube 2. It is set to be sealed.
- the third grooves 11d and 12d are set to be concentric with the second grooves 11c and 12c, and communicate with the second grooves 11c and 12c and the outside of the molds 11 and 12, and the thick metal core 13 As the shape corresponding to the outer diameter, when the thick cored bar 13 is sandwiched between the molds 11 and 12, the inside of the third grooves 11 d and 12 d is set to be sealed with the thick cored bar 13.
- the fourth grooves 11e and 12e extend from the cavities 11a and 12a to the outside of the molds 11 and 12, and are separated from the line connecting the first grooves 11b and 12b and the second grooves 11c and 12c.
- the fifth grooves 11f and 12f are set to be concentric with the fourth grooves 11e and 12e, and communicate with the fourth grooves 11e and 12e and the outside of the molds 11 and 12, and the outer diameter of the cored bar 14
- the first grooves 11b and 12b, the second grooves 11c and 12c, and the fourth grooves 11e and 12e are arranged so as to be branched in a Y shape.
- the second grooves 11c and 12c and the fourth grooves 11e and 12e can be extended to the outside of the molds 11 and 12, and the third grooves 11d and 12d and the fifth grooves 11f and 12f can be omitted.
- the thick cored bar (first cored bar) 13 is positioned in the outer tube 2 and the outer tube 2 so as to form the first lumen 5 at the branching portion 6 as shown in FIGS. 5A to 5C and FIG.
- An insertion portion 13 a that can be inserted into a gap with the inner tube 4 is provided.
- the insertion portion 13 a has an outer surface portion 13 b having an outer diameter equal to the inner diameter of the outer tube 2 and a substantially cylindrical shape, and an inner surface portion 13 c along the outside of the inner tube 4.
- the inner surface portion 13 c of the insertion portion 13 a is a groove 13 c corresponding to the outer shape of the inner tube 4.
- a terminal end 13 d is provided in the length direction of the groove 13 c of the insertion portion 13 a, and the thick metal core 13 is expanded from the terminal end 13 d toward the base end side of the branching portion 6. It has a diameter. That is, the terminal end 13d is provided in the groove 13c so that the diameter of the first lumen 5 is increased. That is, the distal end side of the thick metal core 13 from the terminal end 13d is the insertion portion 13a, and the groove 13c is provided in the entire length of the insertion portion 13a.
- the cross-sectional shape of the insertion portion 13a in the direction intersecting the axis is formed in a substantially crescent shape.
- the cored bar (second cored bar) 14 can be inserted into the inner tube 4 (9), has a cylindrical shape having the same outer dimensions as the inner diameter of the inner tube 4, and is inserted into the inner tube 4.
- the cored bar 14 is set so that the inner tube 4 can be positioned inside the outer tube 2 when disposed in the groove 13c.
- the cross-sectional shape of the metal core (second metal core) 14 in the direction intersecting the axis is substantially circular.
- the material constituting the core bars 13 and 14 is not particularly limited as long as the core bars 13 and 14 are not melted or deformed, but metals are preferable, and examples thereof include stainless steel and iron.
- the manufacturing method of the catheter 1 in the present embodiment includes the second core metal insertion step S1, the inner tube groove arrangement step S2, the first core metal insertion step S3, and the outer die arrangement step S4. And a resin injection step S5 and a mold release and core metal removal step S6.
- the second core metal 14 is inserted into the proximal end side of the inner tube 4.
- the insertion position of the second cored bar 14 to the distal end side with respect to the inner tube 4 is set as the outer position of the branch portion 6 or the outer position of the molds 11 and 12.
- the second cored bar 14 serving as the proximal end side of the branching portion 6 is provided with a separate tube. 9 is inserted at a predetermined position.
- the first core bar 13 is set in a state where the inner tube 4 into which the second core bar 14 has been inserted in the second core bar insertion step S1 is bent corresponding to the end 13d of the groove 13c. Arranged in the groove 13c. At this time, the position where the inner tube 4 into which the second metal core 14 is inserted is separated from the groove 13c of the first metal core 13 is located inside the branching portion 6 and needs to exactly match the terminal end 13d. However, the end 4a of the inner tube 4 is set so as to be separated from the terminal end 13d by the distance within the predetermined range described above.
- the distal end side of the second core metal 14 the inner tube 4 into which the second core metal 14 was inserted, and the proximal end side of the inner tube 4 were disposed in the groove 13c.
- the insertion portion 13 a of the first core bar 13 is inserted from the end side of the outer tube 2. Or as a process so far, while inserting the 2nd metal core 14 in the inner tube 4 previously inserted in the outer tube 2, between the outer tube 2 and the inner tube 4, the insertion part 13a of the 1st metal core 13 is inserted. May be inserted.
- the second core metal 14, the inner pipe 4, the first core metal 13, and the outer pipe 2 are arranged in the corresponding grooves 11b to 12f of the outer molds 11, 12.
- the position of the outer tube 2 is restricted by the first grooves 11b and 12b
- the position of the tube 8 is restricted by the second grooves 11c and 12c
- the position of the thick metal core 13 is It is regulated by the third grooves 11d and 12d
- the position of the inner tube 4 or the position of the tube 9 is regulated by the fourth grooves 11e and 12e
- the position of the core bar 14 is regulated by the fifth grooves 11f and 12f.
- tube 2 in the inserted state are controlled by the 1st groove
- the positions of the second core bar 14, the position of the inner tube 4, the position of the first core bar 13, and the position of the outer tube 2 in the inserted state are made Y-shaped by the first grooves 11 b to 12 f. It will be in the state regulated so that it may become a branched shape.
- the branch portion 6 is formed by injecting molten resin from the gate.
- the temperature of the cylinder in the resin extrusion part at the time of molding is not particularly limited because it depends on the resin to be extruded, but it is preferably 190 to 230 ° C, particularly preferably 200 to 220 ° C.
- the mold temperature is preferably 10 to 50 ° C., more preferably 15 to 20 ° C., depending on the shape of the branch part 6.
- the injected resin forms the branch portion 6 by the cavities 11a and 12a.
- the branch portion 6 is provided with a coaxial outer tube 2 and an inner tube 4 on the distal end side, and a tube 8 and a tube 9 serving as lumens branched to the proximal end side.
- the tube 8 and the tube 9 are provided with an axial angle between each other in the plane of substantially the same plane formed by each lumen.
- the mold release and core metal removal step S6 first, the molds 11 and 12 are released as shown in FIG. Then, the core bars 13 and 14 are removed to form the branch portion 6. Further, if necessary, adhesion or welding is performed outside the branching portion 6. Thereby, the catheter 1 can be finally obtained.
- the catheter of this invention the metal mold
- the structure of each part can exhibit the same function. Any configuration can be substituted.
- the case where there is one inner tube 4 has been described, but it is also possible to use a case where there are a plurality of inner tubes 4 such as two.
- the outer metal mold placement step S4 has a thick core metal 13 that is substantially linear and a core metal 14 that is curved near the end 13d of the groove 13c.
- the core metal 14 may be substantially linear, and the thick core metal 13 may be curved near the end 13d of the groove 13c.
- FIG. 10 is a perspective view showing the catheter in the present embodiment
- FIGS. 11A and 11B are enlarged views of the tube portion inside the branching portion 6.
- the difference from the first embodiment described above is the point related to the cross-sectional shape and end shape of the tube portion 2B, and the other components corresponding to those in the first embodiment described above are denoted by the same reference numerals. A description thereof will be omitted.
- the first lumen 5 and the second lumen 7 are integrally formed as a circular pipe having the same cross section in the tube portion 2B. Yes.
- an end face 21a provided with an opening 5a of the first lumen 5 and an opening 7a of the second lumen 7 are provided at the end of the pipe section 2B.
- an end face 24a is provided on the proximal end side of the tube portion 2B.
- the end faces 21a and 24a are provided so as to be parallel to each other and to be orthogonal to the axis of the tube portion 2B.
- the end surface 21a in the present embodiment corresponds to the end 2a of the outer tube 2 in the first embodiment
- the end surface 24a in the present embodiment corresponds to the end 4a of the inner tube 4 in the first embodiment
- openings 5a and 7a are formed in the end faces 21a and 24a.
- End surfaces 21a and 24a serving as proximal ends of the tube portion 2B are set so that the opening 5a of the first lumen 5 and the opening 7a of the second lumen 7 are positioned along different axes (flow path directions).
- a step is formed by the end surface 21a and the end surface 24a.
- the end surface 21a of the tube portion 2B is set within a range of 5 to 10 mm from the left end position of the branch portion 6, and the end surface 24a of the tube portion 2B is It is set in the range of 10 to 20 mm from the position of the left end portion of the branching portion 6.
- the length of the end surface 24a extending from the end surface 21a toward the inner side of the branching portion 6 at the level difference of the tube portion 2B is set in the range of 5 to 15 mm.
- the opening 5a and the opening 7a are set so that the positions along the flow path of the lumens 5 and 7 of the pipe portion 2B are different within a range of 5 to 15 mm.
- a cylindrical cored bar such as the cored bar 14 is inserted into the first and second lumens to form the branch portion 6.
- the airtightness between the first lumen 5 and the second lumen 7 in the branch portion 6 can be easily maintained. Furthermore, at the end portion of the tube portion 2B in which the first lumen 5 and the second lumen 7 are formed, the tube portion 2B can be manufactured simply by cutting and removing the end portions so as to have the end surfaces 21a and 24a. Therefore, it is possible to reduce the number of work steps, reduce the manufacturing time, reduce the manufacturing cost, and maintain the same sealing performance.
- the step is formed as the parallel end surfaces 21a and 24a.
- the step may be formed as an inclined end surface 21b.
- pipe may be extended by joining another member 24A integrally to the end surface 21a.
- the tube 25 can be provided at the joint portion of the second lumen 7 to improve the sealing performance.
- FIG. 14 shows an example of 3 lumens.
- the opening 5a, the opening 23a, and the opening 7a of each lumen are set to be in positions along different flow paths (axis lines). It can be located at the end of the tube portion 2B in which a step is formed by the end faces 21a, 22a, 24a.
- FIG. 15 is a perspective view showing the catheter in the present embodiment.
- the first embodiment described above is a point related to the end shape of the tube portion 2C and the insertion tube 4, and the others.
- the components corresponding to those of the above-described second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the pipe portion 2C of the present embodiment includes a first lumen 5 and a second lumen 7 that are integrally formed as circular pipes having the same cross section, similarly to the pipe portion 2B of the second embodiment.
- the end 2a of the pipe part 2C in the branch part 6 is a plane orthogonal to the axis, and the opening 5a of the first lumen 5 is provided at the end.
- An insertion tube (inner tube) 4A is inserted into the second lumen 7 only in the vicinity of the branch portion 6, and the inner end face 4a of the branch portion 6 of the insertion tube 4A is the same as that of the inner tube 4 of the first embodiment.
- the end portion 2a is spaced apart in the flow path direction, and the opening 7a of the second lumen 7 is positioned in a state separated from the opening 5a of the first lumen 5 by a predetermined range. That is, the opening 7a of the second lumen 7 is extended from the opening 5a of the first lumen 5 toward the inside of the branching portion 6 by the insertion tube (inner tube) 4A.
- the end surface 2a of the tube portion 2C is set in a range of 5 to 10 mm from the left end position of the branch portion 6, and the end surface 4a of the insertion tube 4A is set to the branch portion 6 Is set in the range of 10 to 20 mm from the left end position. That is, in the tube portion 2C, the length that the end surface 4a extends from the end surface 2a inward of the branching portion 6 is set in the range of 5 to 15 mm.
- the opening 5a and the opening 7a are set such that the positions along the flow path of the lumens 5 and 7 of the pipe portion 2C are different within a range of 5 to 15 mm.
- the end 2a and the end 4a form a step.
- the insertion tube 4A is inserted from the end surface 2a of the tube portion 2C to the distal end side of the tube portion 2C on the left side in the drawing by a depth dimension set in a range of 5 to 20 mm.
- a cylindrical cored bar such as the cored bar 14 is inserted into a position serving as the first second lumen to form the branch portion 6.
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Abstract
Description
本願は、2014年06月27日に、日本に出願された特願2014-133187号に基づき優先権を主張し、その内容をここに援用する。
また、ルーメン内側を流れる流体流量をさらに大きくするとともに、内視鏡等におけるカテーテル外径を増大させないために、ルーメン断面積を大きくして管路抵抗を最小化したい。つまり、ルーメンの全長に亘って断面積をなるべく大きくするために、ルーメンが同軸状に複数の管路となったカテーテルが用いられている。
1.分岐部における密閉性を向上可能とすること。
2.密閉性を劣化させずに容易に製造可能とすること。
3.同軸ルーメンにおいても密閉性を向上可能とすること。
4.カテーテル製造におけるコストの削減を図ること。
5.分岐部のアウトサート時に射出圧でシースがつぶれてしまうことを防止すること。
図1は、本実施形態におけるカテーテルを示す斜視図であり、図2は、図1の拡大斜視図であり、図において、符号1は、カテーテルである。
本実施形態におけるカテーテル1は、図1に示すように、可撓性を有する円筒状の外側管2と、外側管2の先端に取り着けられたバルーン3と、外側管2の内側に同軸状(外側管2の中心軸と内側管4の中心軸とが一致)に設けられた円筒状の内側管4と、基端部(第一端部)側において外側管2と内側管4とを分離する分岐部6と、を有する。バルーン3から分岐部6までの間の外側管2および内側管4は、管部2Aを構成する。
また、外側管2は基端側に設けた分岐部6より第1ルーメン5に個別的に接続したチューブ8と第2ルーメン7に連通するチューブ9とに分岐している。2つのチューブ9,8の延出先端のそれぞれには別々の口金4a,8bが取り付けられている。
外側管2および内側管4は、異なる材料で構成されていても良いが、同じ材料で構成されていることが好ましい。これにより、医療用でのカテーテル1の材料を共通化できるため生産性を向上することができる。
第1ルーメン5は、たとえば、バルーン3まで連通するとともに、バルーン3を膨らませるための流体を供給するように構成されている。
カテーテル1における内側管4の先端部分までは、バルーン3に流体を供給する第1ルーメン5が達していない。また、この先端部分の機械的な強度を保つために、第2ルーメン7が中央に位置される。内側管4の先端部は挿入性を向上させるために、先端に向かってテーパ状に縮径されかつ先端周縁の厚みを全周的に維持するように構成されている。
カテーテル1では、分岐部6において、バルーン3の設けられた先端部(第二端部)側から基端部側に向けて外側管2の長手方向の中心軸と内側管4の長手方向の中心軸とが離れるように、外側管2と内側管4とが分離する。なお、本実施形態においては、外側管2が、分岐部6よりも基端側では外側管2の外径と同じ外径を有する別部材であるチューブ8として分岐部6に嵌挿されている。また、内側管4が、分岐部6よりも基端側で内側管4の外径と同じ外径を有する管材であるチューブ9として分岐部6に嵌挿されている。内側管4は、分岐部6の基端側および先端側で連続した管材であってもよい。
第1ルーメン5および第2ルーメン7の開口5aおよび開口7aがそれぞれ異なる軸線(流路方向)に沿った位置となるように設定され、方向管部2Aの基端側となる外側管2と内側管4との端部2a,4aが形成される。
つまり、外側管2の端部2aから内側管4の端部4aが分岐部6内側方向に延長する長さが、5~15mmの範囲で設定される。言い換えると、開口5aと開口7aとは、内側管4の軸線に沿った位置が、5~15mmの範囲でそれぞれ異なるように設定される。
具体的には、図1に矢視A-Aで示す位置においては、図3Aに示すように、外側管2の長手方向の中心軸と内側管4の長手方向の中心軸とは、同軸状態である。
図2に矢視B-Bで示す分岐部6の外側近傍とされる位置においては、図3Bに示すように、外側管2の中心軸と内側管4の中心軸とは、同軸状態から偏心した状態(外側管2の中心軸と内側管4の中心軸とがずれた状態)である。 図2に矢視C-Cで示す分岐部6中で、外側管2の中心軸と内側管4の中心軸とが離れるが分岐されていない位置においては、図3Cに示すように、内側管4が、一点鎖線で示す外側管2の断面輪郭よりからはみ出す状態である。
金型10は、図4に示すように、上型(外金型)11と下型(外金型)12と太芯金(第1芯金)13と芯金(第2芯金)14とから構成される。
上型11の内面(合わせ面)は、分岐部6となる樹脂成形空間を構成する空間部(キャビティ)11aと、外側管2の先端側を配置可能な第1溝11bと外側管2の基端部側を載置可能な第2溝11cと、第2溝11cに連続して太芯金13を載置可能な第3溝11dと、内側管4の基端側を配置可能な第4溝11eと、第4溝11eに連続して芯金14を載置可能な第5溝11fと、を有している。
第1~第5溝(溝部)11b~11fとは、分岐部6を形成可能な空間部11aを介して対向する位置に略同一平面である基準面上に設けられている。
空間部11aは、分岐部6として、例えば矩形を為しているが、所定の形状を有すればよい。
下型12の内面(合わせ面)は、同様に、分岐部6となる樹脂成形空間を構成する空間部(キャビティ)12aと、外側管2の先端側を配置可能な第1溝12bと外側管2の基端部側を載置可能な第2溝12cと、第2溝12cに連続して太芯金13を載置可能な第3溝12dと、内側管4の基端側を配置可能な第4溝12eと、第4溝12eに連続して芯金14を載置可能な第5溝12fと、を有している。
第1~第5溝(溝部)12b~12fとは、分岐部6を形成可能な空間部12aを介して対向する位置に略同一平面である基準面上に設けられている。
第2溝11c,12cは、キャビティ11a,12aから、金型11,12の外部側へと延在し、外側管2またはチューブ8の外径に対応した形状となるように設定されて、第1溝11b,12bを延長した位置に形成されている。第2溝11c,12cも、同様に、外側管2の外径に対応した形状として、外側管2を金型11,12で挟んだ際に、第2溝11c,12c内部が外側管2で密閉されるように設定されている。
第4溝11e,12eは、キャビティ11a,12aから、金型11,12の外部側へと延在し、第1溝11b,12bと第2溝11c,12cとを結んだ線から、離心するように第1溝11b,12bから角度を有して設定され、内側管4(9)の外径に対応した形状として、内側管4(9)を金型11,12で挟んだ際に、第4溝11e,12e内部が内側管4(9)で密閉されるように設定されている。
これらの第1溝11b,12bと第2溝11c,12cと第4溝11e,12eとは、Y字状に分岐した形状となるように配置されている。
なお、第2溝11c,12cおよび第4溝11e,12eを金型11,12の外部側へと延在させ、第3溝11d,12dと第5溝11f,12fを設けないこともできる。
太芯金(第1芯金)13は、図5A~図5C,図6に示すように、分岐部6において第1ルーメン5を形成するように、外側管2と外側管2内に位置する内側管4との隙間に挿入可能とされる挿入部13aを有する。挿入部13aが、外側管2の内径と等しい外径を有してほぼ円筒状の外面部13bと、内側管4の外部に沿った内面部13cとを有する。挿入部13aの内面部13cが、内側管4の外形に対応した溝13cである。分岐部6に対応する位置において、挿入部13aの溝13cには、その長さ方向に終端13dが設けられて、太芯金13は、終端13dから分岐部6の基端側に向かって拡径している。すなわち、第1ルーメン5が拡径するように溝13cに終端13dが設けられている。つまり、終端13dから太芯金13の先端側が挿入部13aとされて、溝13cは挿入部13aの全長に設けられている。
挿入部13aの、軸線と交差する方向における断面形状が略三日月状に形成されている。
芯金(第2芯金)14の、軸線と交差する方向での断面形状は略円形である。
これら芯金13,14を構成する材料としては、芯金13,14が溶融または変形しない材料であれば特に限定されないが、金属類が好ましく、例えばステンレス鋼、鉄等が挙げられる。
なお、内側管4が分岐部6の基端側において別体とされるチューブ9等が用いられる場合には、分岐部6の基端側となる第2芯金14には、別体のチューブ9を所定位置に挿入しておく。
あるいは、ここまでの工程として、あらかじめ外側管2に挿入された内側管4に第2芯金14を挿入するとともに、外側管2と内側管4との間に第1芯金13の挿入部13aを挿入してもよい。
これにより、第1溝11b~12fによって、挿入された状態である第2芯金14の位置と内側管4の位置と第1芯金13の位置と外側管2の位置とがY字状に分岐した形状となるように規制された状態となる。
成形する際の樹脂押出部におけるシリンダーの温度は、押し出す樹脂に依存するため特に限定されないが、190~230℃が好ましく、特に200~220℃が好ましい。また、金型温度は、分岐部6の形状によるが、10~50℃が好ましく、特に15~20℃が好ましい。
さらに、必要であれば分岐部6外側において接着あるいは溶着等を行う。これにより、最終的にカテーテル1を得ることができる。
例えば、本実施の形態では、内側管4が1本の場合について説明したが、2本等、複数本の場合でも用いることができる。
また、外金型配置工程S4として、図5Bに示すように、太芯金13がほぼ直線状で、芯金14が溝13cの終端13d付近で湾曲させたが、図6に示すように、芯金14がほぼ直線状で、太芯金13が溝13cの終端13d付近で湾曲させてもよい。
図10は、本実施形態におけるカテーテルを示す斜視図であり、図11A及び図11Bは、分岐部6内部の管部の拡大図である。本実施形態において、上述した第1実施形態と異なるのは、管部2Bの断面形状および端部形状に関する点であり、これ以外の上述した第1実施形態と対応する構成には同一の符号を付してその説明を省略する。
端面21a,24aは互いに平行で、管部2Bの軸線に対して直交するように設けられる。
第1ルーメン5の開口5aおよび第2ルーメン7の開口7aがそれぞれ異なる軸線(流路方向)に沿った位置となるように管部2Bの基端側となる端面21a,24aが設定されて、端面21aと端面24aとにより段差が形成される。
つまり、管部2Bの段差において、端面21aから端面24aが分岐部6内側方向に延長する長さが、5~15mmの範囲で設定される。言い換えると、開口5aと開口7aとは、管部2Bのルーメン5,7の流路に沿った位置が5~15mmの範囲でそれぞれ異なるように設定される。
本実施形態においては、上述した上述した第1実施形態と同様、芯金14のような円筒状の芯金をそれぞれ第1、第2ルーメンとなる位置に挿入して分岐部6を形成する。
さらに、本実施形態においては、図13Aに示すように、内側管の端部24は、端面21aに別部材24Aを一体的に接合して延長されていてもよい。その際、図13Bに示すように、第2ルーメン7の接合部分にチューブ25を設けて密閉性の向上を図ることもできる。
図15は、本実施形態におけるカテーテルを示す斜視図であり、本実施形態において、上述した第1実施形態と異なるのは、管部2Cの端部形状および挿入管4に関する点であり、これ以外の上述した第2実施形態と対応する構成には同一の符号を付してその説明を省略する。
つまり、管部2Cにおいて、端面2aから端面4aが分岐部6内側方向に延長する長さが、5~15mmの範囲で設定される。言い換えると、開口5aと開口7aとは、管部2Cのルーメン5,7の流路に沿った位置が5~15mmの範囲でそれぞれ異なるように設定される。管部2Cでは、その端部2aと端部4aとが段差を形成している。また、挿入管4Aは、管部2Cの端面2aから、図で左側なる管部2C先端側へ5~20mmの範囲で設定される深さ寸法だけ挿入されている。
本実施形態においても、上述した第1および第2実施形態と同様、芯金14のような円筒状の芯金をそれぞれ第1第2ルーメンとなる位置に挿入して分岐部6を形成する。
2…外側管
2A、2B、2C…管部
2a…端部
3…バルーン
4…内側管
4a端部
4A…挿入管(内側管)
5…第1ルーメン
5a…開口
6…分岐部
7…第2ルーメン
7a…開口
8,9…チューブ
10…金型
11…上型
11a…空間部
11b~11f…溝(溝部)
12…下型
12b~12f…溝(溝部)
13…第1芯金
13a…挿入部
13b…外面部
13c…内面部(溝)
13d…終端
14…第2芯金
21a,21b,22a,24a…端面
23a…開口
Claims (7)
- 先端側が一定の外径で内部に軸線に沿って延在する複数のルーメンを有する管部と、前記管部の基端部側において前記複数のルーメンの軸線を離間するように分離させる分岐部と、を備え、
前記分岐部内に挿入された前記管部の端部において、前記複数のルーメンの開口がそれぞれ異なる軸線に沿った位置になるように設定され前記管部の端部に段差が形成されることを特徴とするカテーテル。 - 前記管部の内側に前記複数のルーメンのうち少なくとも一つのルーメンが形成された内側管が設けられ、
前記内側管の端部が、前記分岐部内に挿入された前記管部の端部よりも、前記分岐部の基端側に向かって延長されている
請求項1記載のカテーテル。 - 前記内側管が分岐部内部付近にのみ設けられている
請求項2記載のカテーテル。 - 前記管部の内側に前記複数のルーメンのうち少なくとも一つのルーメンが形成された内側管が設けられ、
前記内側管が同軸状ルーメンとして前記管部の外側管の内側に設けられ、
前記内側管の端部が、前記分岐部内に挿入された前記外側管の端部よりも、前記分岐部の基端側に向かって延長されている
請求項1記載のカテーテル。 - 先端側が一定の外径で内部に軸線に沿って延在する複数のルーメンを有する管部と、前記管部の基端部側において前記複数のルーメンの軸線を離間するように分離させる分岐部と、を有するカテーテルであって、前記ルーメンとして前記管部の内側に内側管が設けられ、前記内側管が同軸状ルーメンとして前記管部の外側管の内側に設けられ、前記内側管の端部が、前記分岐部内に挿入された前記外側管の端部よりも、前記分岐部の基端側に向かって延長されているカテーテルを製造する金型であって、
前記外側管と前記外側管内に位置する前記内側管との隙間に挿入される第1芯金と、前記内側管内に挿入される第2芯金と、前記第1芯金及び前記第2芯金を覆って前記分岐部の外形を形成する外金型と、を備え、
前記第1芯金において、前記外側管に挿入する挿入部が、前記外側管の内部に沿った外面部と前記内側管の外部に沿った内面部とを有し、
前記内面部が前記内部管の外形に対応した溝であり、前記挿入部の前記溝にはその長さ方向に終端が設けられ、
前記第1芯金は、前記終端から前記分岐部の基端側に向かって拡径し、
前記外金型には、前記外側管と前記内側管とこれらに挿入された前記第1及び第2芯金を配置可能なY字状に分岐した溝部と、これら溝部とともに前記分岐部を形成可能な空間部とが配置される
カテーテル製造用金型。 - 前記第1芯金の前記挿入部の、軸線と交差する方向における断面形状が略三日月状であり、
前記第2芯金の、軸線と交差する方向における断面形状が略円形である
請求項5記載のカテーテル製造用金型。 - 請求項5または請求項6に記載の金型を用いてカテーテルを製造する方法であって、
前記第2芯金を前記内側管に挿入する工程と、
前記第2芯金の挿入された前記内側管を前記第1芯金の前記溝に配置する工程と、
前記第2芯金と前記内側管と前記第1芯金とを前記外側管に挿入する工程と、
前記第2芯金と前記内側管と前記第1芯金と前記外側管とを前記外金型の対応する前記溝部に配置する工程と、
前記空間部に樹脂を注入して前記分岐部を形成する工程と、
前記金型を離型すると共に前記芯金を除去する工程とを有している
カテーテルの製造方法。
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CN201580033448.6A CN106470730A (zh) | 2014-06-27 | 2015-05-13 | 导管、导管制造用模具、导管的制造方法 |
KR1020167035054A KR20170008268A (ko) | 2014-06-27 | 2015-05-13 | 카테터, 카테터 제조용 금형, 카테터의 제조 방법 |
DE112015002449.2T DE112015002449T5 (de) | 2014-06-27 | 2015-05-13 | Katheter, Katheterherstellungsformteil, Katheterherstellungsverfahren |
US15/370,096 US20170080181A1 (en) | 2014-06-27 | 2016-12-06 | Catheter, catheter production mold, catheter production method |
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US11376394B2 (en) | 2017-05-16 | 2022-07-05 | Coloplast A/S | Method of forming a urinary catheter |
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WO2018123934A1 (ja) * | 2016-12-28 | 2018-07-05 | 東洋紡株式会社 | 樹脂成形物、および樹脂成形物の製造方法 |
CN110461403B (zh) * | 2017-03-31 | 2022-07-29 | 泰尔茂株式会社 | 球囊导管及医疗用长条体的制造方法 |
JP7082624B2 (ja) * | 2017-04-28 | 2022-06-08 | シー・アール・バード・インコーポレーテッド | 二重内腔超音波カテーテル、システム、および方法 |
WO2021171473A1 (ja) * | 2020-02-27 | 2021-09-02 | オリンパス株式会社 | 医療用バルーンカテーテル |
KR102309873B1 (ko) * | 2020-09-29 | 2021-10-08 | 주식회사 바스플렉스 | 멀티루멘 카테터 제조용 노즐 팁 어셈블리 |
CN112743726A (zh) * | 2020-12-22 | 2021-05-04 | 海南维力医疗科技开发有限公司 | 一种成型带囊乳胶导管充盈腔成型的工艺 |
US11759611B2 (en) | 2021-08-09 | 2023-09-19 | Evolve Medicus, Inc. | Integrated catheter assembly |
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US20170080181A1 (en) | 2017-03-23 |
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