WO2017110757A1 - バルーンカテーテル、および医療用長尺体 - Google Patents
バルーンカテーテル、および医療用長尺体 Download PDFInfo
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- WO2017110757A1 WO2017110757A1 PCT/JP2016/087837 JP2016087837W WO2017110757A1 WO 2017110757 A1 WO2017110757 A1 WO 2017110757A1 JP 2016087837 W JP2016087837 W JP 2016087837W WO 2017110757 A1 WO2017110757 A1 WO 2017110757A1
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- tube
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- linear
- reinforcing
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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
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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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
- A61L29/04—Macromolecular materials
- A61L29/041—Macromolecular materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
- A61L29/04—Macromolecular materials
- A61L29/06—Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
- A61L29/14—Materials characterised by their function or physical properties, e.g. lubricating compositions
- A61L29/18—Materials at least partially X-ray or laser opaque
-
- 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
-
- 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
- A61M25/0012—Making of catheters or other medical or surgical tubes with embedded structures, e.g. coils, braids, meshes, strands or radiopaque coils
-
- 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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/0045—Catheters; Hollow probes characterised by structural features multi-layered, e.g. coated
-
- 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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/005—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids
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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
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
-
- 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
- B29C48/152—Coating hollow articles the inner surfaces thereof
- B29C48/153—Coating both inner and outer surfaces
-
- 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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M2025/006—Catheters; Hollow probes characterised by structural features having a special surface topography or special surface properties, e.g. roughened or knurled surface
-
- 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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M2025/0062—Catheters; Hollow probes characterised by structural features having features to improve the sliding of one part within another by using lubricants or surfaces with low friction
-
- 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
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M2025/0183—Rapid exchange or monorail catheters
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29L2031/7543—Balloon catheters
Definitions
- the present invention relates to a balloon catheter and a medical long body.
- a balloon catheter is widely known as a medical device that expands a stenosis formed in a living body (see Patent Document 1 below).
- a relatively long medical device such as a balloon catheter has desired physical properties so that kinks and folds do not occur when used in vivo.
- kink resistance hard to bend against bending
- tensile strength by embedding a metal reinforcement such as a coil in a resin tube.
- the kink resistance and the tensile strength can be improved by adding a metal reinforcement to the shaft for the baru catheter as well.
- An object of the present invention is to provide a balloon catheter that can improve the operability of a guide wire and can prevent various problems that may occur when a metal reinforcement is used.
- the present invention can reduce the sliding resistance of a medical device inserted through a lumen, and can prevent the occurrence of various problems that may occur when a metal reinforcing body is used.
- the purpose is to provide a body.
- a balloon catheter according to the present invention includes an outer tube having a lumen, an inner tube that is disposed in the lumen of the outer tube and includes a guide wire lumen through which a guide wire can be inserted, and a distal end side of the inner tube.
- a balloon fixed to a distal end side of the outer tube, and a proximal end portion of the inner tube forms a proximal end opening communicating with the guide wire lumen in the middle of the outer tube.
- the inner pipe is provided with a tube body made of a first resin and a reinforcing body disposed inside the tube body, and the reinforcing body is constituted by a linear body having a second resin.
- the inner tube includes a first region including a distal end portion in which a distal end opening is formed, and a second region disposed closer to the proximal end than the first region, and the linear tube
- the body protrudes from the inner surface of the tube body in the second region. Ri and, in the first region, characterized in that does not protrude from the inner surface of the tube body than the second region.
- the medical elongated body according to the present invention is a medical elongated body having a long catheter body, and the catheter body includes a tube body made of a first resin and a lumen of the catheter body.
- the tube body has a convex portion that enters the gap portion on the inner surface of the tube body, and at least an outer peripheral surface of the linear body is formed of a second resin.
- the first resin is fused to the second resin in a state where the convex portion enters the gap, and the melting point of the first resin is lower than the melting point of the second resin.
- the balloon catheter configured as described above has improved kink resistance and tensile strength due to the reinforcing body provided inside the tube body included in the inner tube. Further, the inner tube of the balloon catheter has the first resin and the second resin melted and solidified in the first region in the vicinity of the tip opening, so that the inner peripheral surface of the inner tube has less unevenness due to the reinforcing body, and the tip opening It is possible to prevent the guide wire from being caught by the reinforcing body in the vicinity. On the other hand, in the second region closer to the proximal end than the vicinity of the distal opening, the sliding resistance of the guide wire is reduced by the unevenness caused by the reinforcing body.
- both the tube body and the reinforcing body of the balloon catheter contain resin, the tube body and the reinforcing body are easily fused to each other as compared with the case where the reinforcing body is made of metal. Therefore, when the tip of the inner tube is cut and the tip is attached, it is not necessary to perform end treatment so that the end of the reinforcing body does not come apart, and the manufacturing operation is facilitated.
- the long medical body configured as described above has improved kink resistance and tensile strength due to the reinforcing body provided on the inner surface of the tube body.
- the inner surface of the tube body is brought into contact with the medical device by a reinforcing body (knitted linear body) disposed on the inner surface of the tube body. The area is reduced. For this reason, the medical device inserted into the lumen of the catheter body has reduced sliding resistance with the inner surface of the tube body.
- both the tube body and the reinforcing body contain a resin
- the long body for medical use is more easily fused with the tube body and the reinforcing body than when the reinforcing body is made of metal.
- the convex part which consists of 1st resin enters into the clearance gap part of 2nd resin which comprises a reinforcement body, the contact area of 1st resin and 2nd resin becomes large, and a tube body and a reinforcement body Can be strengthened.
- the melting point of the first resin constituting the long tube for medical use is lower than the melting point of the second resin contained in the reinforcing body. For this reason, when arrange
- the reinforcing body of the medical long body includes the second resin, the reinforcing body and the tube body are fused well.
- the distal end of the catheter body is cut and the distal end tip or the hub is attached, it is not necessary to perform end processing so that the end of the reinforcing body does not vary, and the manufacturing operation is facilitated.
- FIG. 2A is a diagram showing a cross section along the axial direction of the broken line portion 2A shown in FIG. 1, and FIG. 2B shows a cross section along the axial direction of the broken line portion 2B shown in FIG.
- FIG. 3A is a diagram showing an axial orthogonal cross section taken along line 3A-3A shown in FIG. 2A, and FIG. 3B is an axis taken along line 3B-3B shown in FIG. 2A.
- FIG. 4A is a diagram showing an axial orthogonal cross section along line 4A-4A shown in FIG. 2A
- FIG. 4B is an axis along line 4B-4B shown in FIG.
- FIG. 5A is a diagram showing an axial orthogonal section taken along line 5A-5A shown in FIG. 2B
- FIG. 5B is an axis taken along line 5B-5B shown in FIG. 2B
- FIG. 6A is an enlarged view showing a part of a linear body constituting the reinforcing body
- FIG. 6B is a cross-sectional view taken along line 6B-6B shown in FIG. 6A. is there.
- FIG. 7A is a view showing a cross section of the distal end portion of the balloon catheter according to Modification 1 of the first embodiment
- FIG. 7A is a view showing a cross section of the distal end portion of the balloon catheter according to Modification 1 of the first embodiment
- FIG. 7B is an axis orthogonal view along the line 7B-7B shown in FIG. 7A. It is a figure which shows a cross section.
- FIG. 8 is a diagram illustrating an axial orthogonal cross section of the inner tube according to Modification 2 of the first embodiment. It is a figure which shows the medical elongate body which concerns on 2nd Embodiment.
- FIG. 10A is a diagram showing a cross section along the axial direction of the distal end portion of the medical elongated body according to the second embodiment
- FIG. 10B is a diagram of the medical elongated body according to the embodiment. It is a figure which shows the cross section along the axial direction of a base end part.
- FIG. 11A is a diagram showing an axial orthogonal cross section taken along line 11A-11A shown in FIG. 10A
- FIG. 11B is an axis taken along line 11B-11B shown in FIG. 10B.
- FIG. 12A is an enlarged view showing a part of a linear body constituting the reinforcing body
- FIG. 12B is a cross-sectional view taken along the line 12B-12B shown in FIG. 12A. is there.
- FIG. 13 (A) is a view showing a cross section of the distal end portion of the medical elongated body according to the first modification of the second embodiment
- FIG. 13 (B) is a line 13B-13B shown in FIG. 13 (A).
- FIG. 14 is a diagram showing an axial orthogonal cross section of a catheter body according to Modification 2 of the second embodiment.
- a balloon catheter 1 allows a long shaft 10 to be inserted into a living organ and expands a balloon 5 disposed on the distal end side of the shaft 10 at a stenosis (lesion).
- This is a medical device that spreads and treats the stenosis.
- the balloon catheter 1 is configured as a PTCA dilatation balloon catheter used to widen the stenosis of the coronary artery.
- a PTCA dilatation balloon catheter used to widen the stenosis of the coronary artery.
- other blood vessels, bile ducts, trachea, esophagus, other digestive tract It can also be configured to be used for the treatment and improvement of strictures formed in living organs such as the urethra, ear nasal lumen, and other organs, and medical devices such as stents can be used in vivo. It is also possible to configure as a delivery balloon catheter used for the purpose of transport.
- a balloon catheter 1 includes a shaft 10, a balloon 5 which is disposed on the distal end side of the shaft 10 and can be expanded and contracted in accordance with inflow and discharge of a pressurized medium, and a base of the shaft 10. And a hub 160 disposed on the end side.
- the side where the distal tip 150 is disposed in the balloon catheter 1 is referred to as the distal end side
- the side where the hub 160 is disposed in the balloon catheter 1 is referred to as the proximal end side
- the direction in which the shaft 10 extends is the axial direction. Called.
- FIG. 2A is an enlarged cross-sectional view of the broken line portion 2A shown in FIG. 1
- FIG. 2B is an enlarged cross-sectional view of the broken line portion 2B shown in FIG.
- the balloon catheter 1 is a so-called rapid exchange type in which a proximal end opening 104a through which a guide wire W is led out is provided near the distal end side of the shaft 10.
- the shaft 10 has a pressurized medium between the inner tube 100 in which the guide wire lumen 101 through which the guide wire W is inserted and the inner tube 100.
- the outer tube 140 forms a pressurized medium lumen 141 that can circulate.
- the shaft 10 has a double tube structure in which the inner tube 100 is inserted into the outer tube 140 and the inner tube 100 and the outer tube 140 are concentrically positioned.
- the inner tube 100 includes two openings, a distal end opening 103a formed at the distal end and a proximal end opening 104a formed at the proximal end.
- a guide wire lumen 101 communicating with each of the openings 103a and 104a extends inside the inner tube 100.
- the inner tube 100 is constituted by a hollow tube material whose proximal end is curved radially outward.
- the tip of the balloon 5 is joined in a liquid-tight or air-tight manner by a known method such as welding. Further, the vicinity of the proximal end of the inner tube 100 is joined in a liquid-tight and air-tight manner with a connection opening 144 formed at a predetermined position of the outer tube 140.
- the guide wire W is inserted into the guide wire lumen 101 with the distal end opening 103a provided at the distal end of the inner tube 100 as an inlet and the proximal end opening 104a provided at the proximal end of the inner tube 100 as an outlet.
- the inner tube 100 is provided with an X-ray contrast marker 170 indicating the axial center position of the balloon 5.
- an X-ray contrast marker 170 for example, a thin metal wire made of a metal such as platinum, gold, silver, titanium, tungsten, or an X-ray opaque material such as an alloy thereof can be used.
- the X-ray contrast marker 170 may use a resin material containing a powder of an X-ray opaque material.
- a tip chip 150 is attached to the tip of the inner tube 100.
- the distal tip 150 has a tapered shape whose outer diameter decreases toward the distal end side.
- a through hole 151 that penetrates the tip tip 150 in the axial direction is formed inside the tip tip 150. The through hole 151 allows the guide wire W inserted through the guide wire lumen 101 of the inner tube 100 to be led out of the inner tube 100.
- the tip chip 150 can be formed of, for example, a flexible resin member having heat shrinkability.
- the material of the tip 150 is not particularly limited as long as it can be fixed to the inner tube 100.
- the tip chip 150 can be fixed to the inner tube 100 by fusion.
- the distal tip 150 has the proximal end face abutted against the distal end surface of the inner tube 100 and the outer periphery of the proximal end of the distal tip 150 is covered by the distal end of the balloon 5. It is fixed in the state.
- the fixing of the distal tip 150 is not limited to such a form.
- the distal tip 150 may be fixed in a state where the outer periphery of the distal end of the inner tube 100 is covered, or enters the distal end of the inner tube 100. It may be fixed in the state.
- the outer tube 140 is composed of a tubular member having a lumen extending from the vicinity of the proximal end of the balloon 5 to the hub 160. Near the distal end of the outer tube 140, the base end of the balloon 5 is joined in a liquid-tight or air-tight manner by a known method such as welding.
- Examples of the constituent material of the outer tube 140 include polyolefins such as polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer, thermoplastic resins such as soft polyvinyl chloride, silicone rubber, and latex rubber.
- polyolefins such as polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer
- thermoplastic resins such as soft polyvinyl chloride, silicone rubber, and latex rubber.
- Various rubbers, various elastomers such as polyurethane elastomer, polyamide elastomer, and polyester elastomer, and crystalline plastics such as polyamide, crystalline polyethylene, and crystalline polypropylene can be used.
- an antithrombotic substance such as heparin, prostaglandin, urokinase, arginine derivative or the like can be blended to obtain a material having
- the hub 160 includes a port 161 that can be connected in a liquid-tight and air-tight manner to a supply device (not shown) such as an indeflator for supplying a pressurized medium.
- a supply device such as an indeflator for supplying a pressurized medium.
- the port 161 of the hub 160 can be configured by, for example, a known luer taper or the like in which a fluid tube or the like can be connected / separated.
- the pressurized medium (for example, physiological saline, contrast medium, etc.) used for expanding the balloon 5 can be flowed into the shaft 10 through the port 161 of the hub 160.
- the pressurized medium is supplied to the balloon 5 via the pressurized medium lumen 141.
- the balloon 5 includes a straight expansion effective portion (pressurizing portion) that pushes the constriction formed in the body lumen along with expansion deformation, and the distal end of the expansion effective portion. And a tapered portion provided on each of the side end and the base end side.
- the distal end portion of the balloon 5 is fixed to the outer surface on the distal end side of the inner tube 100.
- the proximal end portion of the balloon 5 is fixed to the outer surface of the outer tube 140 on the proximal end side.
- the constituent material of the balloon 5 is not particularly limited.
- Vinyl copolymers, thermoplastic resins such as polyurethane, polyamide, polyamide elastomer, polystyrene elastomer, silicone rubber, latex rubber, and the like can be used.
- the inner tube 100 includes a predetermined tube body 110, a reinforcing body 120 disposed inside the tube body 110, and an outer surface of the tube body 110.
- An outer layer 130 As shown in FIGS. 2A and 2B, the inner tube 100 includes a predetermined tube body 110, a reinforcing body 120 disposed inside the tube body 110, and an outer surface of the tube body 110. An outer layer 130.
- the inner tube 100 includes a first region 103 including a distal end portion in which a distal end opening 103a is formed, and a second region 105 disposed on the proximal end side with respect to the first region 103. And have. Further, as shown in FIG. 2B, the inner tube 100 has a third region 104 that is disposed on the proximal end side with respect to the second region 105.
- the tip chip 150 is disposed in the first region 103.
- the proximal end opening 104 a of the inner tube 100 is disposed in the third region 104.
- the tube body 110 has a hollow tube shape extending in the axial direction of the inner tube 100. Similar to the tube body 110, the outer layer 130 has a hollow tube shape extending in the axial direction of the inner tube 100.
- the tube body 110 is made of a predetermined first resin. Moreover, the linear body 121 which comprises the reinforcement body 120 is comprised by predetermined 2nd resin whose melting
- the tube body 110 has a convex portion 113 formed on the inner surface 111 of the tube body 110.
- the convex 113 protrudes radially inward (radially inward) from the inner surface 111 so as to enter the gap 123 formed in the reinforcing body 120.
- the shapes of the tube body 110, the reinforcing body 120, and the outer layer 130 are orthogonal to each other.
- the shape is not limited to a circle, and may be, for example, an ellipse or a rectangle. .
- the convex portion 113 is formed by melting a part of the first resin constituting the tube body 110 and flowing into the gap portion 123.
- the cross-sectional shape of the convex portion 113 shown in the figure is an example, and the shape of the convex portion 113 can be changed as appropriate.
- the reinforcing body 120 is formed of a plurality of linear bodies 121 knitted.
- the reinforcing body 120 has a gap 123 formed between the knitted linear bodies 121.
- the reinforcing body 120 has a tube shape extending in the axial direction of the inner tube 100.
- the reinforcing body 120 has a function of increasing the kink resistance and tensile strength of the inner tube 100 and a function of reducing the sliding resistance of the guide wire W inserted through the guide wire lumen 101 of the inner tube 100.
- the linear body 121 constituting the reinforcing body 120 protrudes from the inner surface 111 of the tube body 110, the area where the inner surface 111 of the tube body 110 and the guide wire W come into contact with each other is small, so the sliding resistance is small.
- the braided structure of the reinforcing body 120 for example, a 1 over 1 under structure in which the linear bodies 121 alternately intersect can be employed. However, it is not limited to such a structure.
- the linear body 121 can be formed of, for example, a wire having a round cross-sectional shape. By using the round wire, the contact area between the guide wire W inserted into the guide wire lumen 101 of the inner tube 100 and the reinforcing body 120 can be reduced, and thus the sliding resistance is more preferably reduced. It becomes possible.
- the linear body 121 can also be formed, for example with a wire with an elliptical cross-sectional shape. When an elliptical wire is used, the area of the portion where the wires overlap is increased, so that the rigidity of the reinforcing body 120 can be increased.
- the reinforcing body 120 can be formed of, for example, a wire having a rectangular cross-sectional shape, or may be formed by combining round shapes, elliptical shapes, rectangular shapes, and the like. It is also possible to configure with a wire rod.
- the outer diameter of the wire used is not particularly limited.
- the reinforcing body 120 is formed of a second resin having a melting point higher than that of the first resin constituting the tube body 110.
- a part of the tube body 110 is melted while the melting of the reinforcing body 120 is suppressed. For this reason, the reinforcing body 120 maintains the shape of the linear body 121.
- the contact area between the inner surface 111 of the tube body 110 and the guide wire W is reduced, so that the sliding resistance is greatly reduced. To do.
- the reinforcing body 120 and the tube body 110 are heat-sealed by heating from the outer periphery of the tube body 110, the reinforcing body 120 is partially melted on the tube body 110 side of the reinforcing body 120. May be.
- modified polyethylene (melting point: about 128 ° C.) can be used.
- Examples of the second resin constituting the linear body 121 include polypropylene (melting point: about 168 ° C.), nylon 12 (melting point: about 179 ° C.), nylon 6 (melting point: about 225 ° C.), or nylon 66 (melting point: about 265 ° C.). Can be used. However, any resin having a melting point higher than that of the first resin constituting the tube body 110 may be used, and any resin can be selected according to the relationship with the material of the tube body 110.
- the linear body 121 constituting the reinforcing body 120 is formed only by the second resin. For this reason, it is possible to prevent the reinforcing body 120 and the guide wire W from rubbing when the guide wire W is inserted through the guide wire lumen 101, and it is possible to suitably prevent the guide wire W from being damaged or broken. Further, when the inner pipe 100 is molded using a mold or the like, the tube body 110 and the linear body 121 are formed only of resin, so that the outer diameter, thickness, It is possible to adjust the hardness and the like. Therefore, the inner tube 100 is excellent in workability.
- the outer layer 130 is made of a resin having a melting point higher than that of the first resin constituting the tube body 110 as in the case of the linear body 121.
- the resin constituting the outer layer 130 for example, the above-described resins exemplified as the resin constituting the linear body 121 can be used.
- any resin having a melting point higher than that of the first resin constituting the tube body 110 may be used, and an arbitrary one is selected according to the material of the tube body 110 as with the second resin constituting the linear body 121. be able to.
- the shape or the like of the convex portion 113 can be adjusted according to the thickness of the linear body 121.
- the length d3 (see FIG. 4A) of the convex portion 113 of the portion that has entered the gap portion 123 is 2 of the thickness of the linear body 121 in the cross section perpendicular to the axial direction of the inner tube 100. It can be less than double. This is due to the following reason.
- the thickness of the reinforcing body 120 is the thickness (outer diameter) d1 of the linear body 121a and the thickness (outside) of the linear body 121a. It is a dimension obtained by adding (diameter) d2. Therefore, if the length d3 of the convex portion 113 of the portion that has entered the gap 123 is less than the dimension obtained by adding the linear bodies 121a and 121b (less than twice the thickness of the linear body 121), the gap 123 Further, the protrusion 113 can be prevented from protruding to the inside in the radial direction, and the sliding resistance of the guide wire W can be suitably reduced.
- the length d3 of the convex portion 113 of the portion that has entered the gap portion 123 is made smaller than the total thickness dimension of the similarly knitted portion. Thus, it is possible to suitably reduce the sliding resistance.
- FIG. 6B is a view showing a cross section of a portion where adjacent linear bodies 121a and 121b intersect (a cross-sectional view taken along line 6B-6B in FIG. 6A).
- a portion where the plurality of linear bodies 121a and 121b intersect with each other at least one of the linear bodies 121b has a recessed shape.
- FIG. 6B shows an example in which the concave portion 122 is formed only in one adjacent linear body 121b.
- the concave portion 122 may be formed by both heat application and stress application.
- the linear bodies 121a and 121b may be formed, or only the linear bodies 121a disposed on the outer surface side of the inner tube 100 may be formed.
- the depth, shape, and the like of the concave portion 122 can be changed as appropriate according to the conditions at the time of fusion, and thus are not limited to the illustrated shape.
- each linear body 121a, 121b is arrange
- the angle of the overlapping part (intersection part) of the linear bodies 121 changes suitably. Is possible.
- FIG. 3A shows an axial orthogonal cross section of the inner tube 100 in the first region 103.
- FIG. FIGS. 3B, 4 ⁇ / b> A, 4 ⁇ / b> B, and 5 ⁇ / b> A show the axial orthogonal cross section of the inner tube 100 in the second region 105.
- FIG. 5B shows an axial orthogonal cross section of the inner tube 100 in the third region 104.
- a part of structure is expanded and shown (the part enclosed with the broken-line part in each figure).
- the linear body 121 protrudes from the inner surface 111 of the tube body 110 in the second region 105. Further, the linear body 121 does not protrude from the inner surface 111 of the tube body 110 in the first region 103 than in the second region 105. Further, the linear body 121 does not protrude from the inner surface 111 of the tube body 110 in the third region 104 than in the second region 105. The reason for adjusting the protruding length of the linear body 121 in each part of the inner tube 100 will be described.
- the area where the inner surface 111 of the tube body 110 and the guide wire W come into contact is reduced. Sliding resistance decreases. That is, in the second region 105, the sliding resistance of the guide wire W is small.
- the protruding length of the linear body 121 is made smaller than that of the second region 105.
- the guide wire W is inserted into the guide wire lumen 101 when the guide wire W is inserted into the linear body 121.
- the guide wire W may be bent or bent, and smooth insertion may be hindered. Therefore, the length of the linear body 121 protruding from the inner surface 111 is reduced in the vicinity of the tip opening 103a. In other words, in the first region 103, the first resin of the tube body 110 and the second resin of the linear body 121 are in a melted and solidified state than the second region 105.
- melting and solidifying means that at least a part of the first resin and at least a part of the second resin are melted and solidified in a state where the first resin and the second resin are mixed. Therefore, the bonding strength between the tube body 110 and the reinforcing body 120 in the first region 103 is larger than the bonding strength between the tube body 110 and the reinforcing body 120 in the second region 105.
- the guide wire W is linear when the guide wire W is pulled out from the guide wire lumen 101.
- the guide wire W may be bent or bent. Therefore, the length in which the linear body 121 protrudes from the inner surface 111 is also reduced in the vicinity of the base end opening 104a.
- the first resin of the tube body 110 and the second resin of the linear body 121 are in a melted and solidified state than the second region 105. For this reason, the bonding strength between the tube body 110 and the reinforcing body 120 in the third region 104 is larger than the bonding strength between the tube body 110 and the reinforcing body 120 in the second region 105.
- the first region 103 and the third region 104 A melting part 125 is formed by melting the arranged linear body 121.
- the original shape of the linear body 121 does not remain. Further, the melting part 125 is fused to the tube body 110. For this reason, the first region 103 and the third region 104 are hardly provided with the uneven shape and the gap portion 123 formed by the linear body 121. Therefore, the inner surface 111 of the inner tube 100 forms a smooth surface with less unevenness along the circumferential direction than the second region 105 in the first region 103 and the third region 104.
- the guide wire W near the distal end opening 103a and the proximal end opening 104a. It is possible to more suitably prevent the occurrence of problems such as being caught.
- the length that the linear body 121 protrudes in the first region 103 and the third region 104 is smaller than that of the second region 105, as long as it can prevent problems such as the guide wire W being caught. There is no particular limitation on the.
- the protruding length of the linear body 121 from 111 is reduced.
- the inner pipe 100 is prevented from being folded or kinked.
- the protruding length of the linear body 121 from 111 is reduced.
- the reinforcing body 120 is interposed between the second region 105 and the third region 104 by gradually decreasing the protruding length of the linear body 121. It is possible to prevent the inner pipe 100 from being broken or kinked in the vicinity of the boundary portion A2 by suppressing the occurrence of an extreme difference in physical properties due to the reinforcement.
- the balloon catheter 1 includes an outer tube 140 having a lumen, an inner tube 100 that is disposed in the lumen of the outer tube 140 and that has a guide wire lumen 101 through which the guide wire W can be inserted, and a distal end side of the inner tube 100. And a balloon 5 fixed to the distal end side of the outer tube 140.
- the proximal end portion of the inner tube 100 is provided so as to form a proximal end opening 104 a communicating with the guide wire lumen 101 in the middle of the outer tube 140.
- the inner tube 100 includes a tube body 110 made of a first resin, and a reinforcing body 120 disposed inside the tube body 110.
- the reinforcement body 120 is comprised from the linear body 121 which has 2nd resin.
- the inner tube 100 includes a first region 103 including a distal end portion in which a distal end opening 103 a is formed, and a second region 105 disposed on the proximal end side with respect to the first region 103.
- the linear body 121 protrudes from the inner surface 111 of the tube body 110 in the second region 105, and protrudes from the inner surface 111 of the tube body 110 in the first region 103 more than the second region 105. Absent.
- the balloon catheter 1 includes an outer tube 140 having a lumen, an inner tube 100 that is disposed in the lumen of the outer tube 140 and includes a guide wire lumen 101 through which the guide wire W can be inserted, and the inner tube 100. And a balloon 5 fixed to the distal end side and the distal end side of the outer tube 140.
- the proximal end portion of the inner tube 100 is provided so as to form a proximal end opening 104 a communicating with the guide wire lumen 101 in the middle of the outer tube 140.
- the inner tube 100 includes a tube body 110 made of a first resin, and a reinforcing body 120 disposed inside the tube body 110.
- the reinforcement body 120 is comprised from the linear body 121 which has 2nd resin.
- the inner tube 100 includes a first region 103 including a distal end portion in which a distal end opening 103 a is formed, and a second region 105 disposed on the proximal end side with respect to the first region 103.
- first region 103 the first resin of the tube body 110 and the second resin of the linear body 121 are melted and solidified more than in the second region 105.
- the kink resistance and the tensile strength are improved by the reinforcing body 120 provided inside the tube body 110 provided in the inner tube 100. Further, in the inner tube 100 of the balloon catheter 1, the first resin and the second resin are melted and solidified in the first region 103 in the vicinity of the distal end opening 103a. Therefore, the guide wire W can be prevented from being caught by the reinforcing body 120 in the vicinity of the tip opening 103a. On the other hand, in the second region 105 closer to the base end side than the vicinity of the distal end opening 103a, the sliding resistance of the guide wire W is reduced by the unevenness due to the reinforcing body 120.
- both the tube body 110 and the reinforcement body 120 contain resin, the tube body 110 and the reinforcement body 120 are easily fused to each other as compared with the case where the reinforcement body 120 is made of metal. Therefore, when the end portion of the inner tube 100 is cut and the tip tip 150 is attached, it is not necessary to perform end processing so that the end portion of the reinforcing body 120 does not come apart, and the manufacturing operation becomes easy. . Further, when attaching the vicinity of the proximal end of the inner pipe 100 to the connection opening 144 formed at a predetermined position of the outer pipe 140, end treatment is performed so that the end of the reinforcing body 120 is not scattered. There is no need, and the manufacturing operation becomes easy.
- the tip chip 150 is arranged in the first region 103. For this reason, when the tip of the balloon catheter 1 comes into contact with a living organ (such as the inner wall of a blood vessel), it is possible to suitably prevent the living organ from being damaged.
- a living organ such as the inner wall of a blood vessel
- the protruding length of the linear member 121 from the inner surface 111 of the tube body 110 decreases from the second region 105 toward the first region 103. ing. Therefore, an extreme difference in physical properties due to reinforcement of the reinforcing body 120 is suppressed between the first region 103 and the second region 105, and the inner pipe 100 is bent or kinked in the vicinity of the boundary portion A1. Can be prevented.
- the inner tube 100 has a third region 104 disposed on the proximal end side with respect to the second region 105, and the linear body 121 is a tube body in the third region 104 rather than the second region 105. It does not protrude from the inner surface 111 of 110. Therefore, when the guide wire W is pulled out from the guide wire lumen 101 through the proximal end opening 104a of the inner tube 100, the guide wire W can be prevented from being caught by the linear body 121, and the guide wire W can be smoothly moved. Can be pulled out.
- the protruding length of the linear body 112 from the inner surface 111 of the tube body 110 decreases from the second region 105 toward the third region 104. ing. For this reason, an extreme difference in physical properties due to reinforcement of the reinforcing body 120 is suppressed between the second region 105 and the third region 104, and the inner pipe 100 is bent or kinked in the vicinity of the boundary portion A2. Can be prevented.
- the reinforcing body 120 is formed of a plurality of knitted linear bodies 121. For this reason, the reinforcement body 120 provides good kink resistance and tensile strength of the inner tube 100.
- the linear body 121 is constituted by a wire having a round cross-sectional shape. Thereby, the contact area between the guide wire W inserted through the guide wire lumen 101 and the reinforcing body 120 can be reduced, and the sliding resistance can be more suitably reduced.
- the linear body 121 is composed only of the second resin. Accordingly, when the guide wire W is inserted through the guide wire lumen 101, the reinforcing body 120 and the guide wire W can be prevented from being scratched, and the guide wire W can be suitably prevented from being damaged or broken. . Further, when the inner pipe 100 is molded using a mold or the like, since the tube body 110 and the linear body 121 are formed of only resin, the outer diameter, thickness, It is possible to adjust the hardness and the like. Therefore, the inner tube 100 is excellent in workability.
- the tube body 110 located in the outer layer of the reinforcing body 120 can be melted and the reinforcing body 120 and the outer layer 130 can be fused, the reinforcing body 120 can be used even when the melting points of the outer layer 130 and the reinforcing body 120 are close.
- the reinforcing body 120 can be joined to the outer layer 130 while suitably preventing the shape of the steel from being damaged.
- the inner tube 100 may not include the outer layer 130. That is, the inner tube 100 can be constituted by the tube body 110 made of the first resin and the reinforcing body 120. Even in such a configuration, the sliding resistance of the guide wire W can be reduced by fusing the tube body 110 and the reinforcing body 120 together. Moreover, since the number of members can be reduced by the amount not using the outer layer 130, it is possible to reduce the manufacturing cost.
- the linear body 321 constituting the reinforcing body 320 can be composed of, for example, a core material 322 made of metal and a second resin 324 that covers the outer peripheral surface of the core material 322. is there.
- Examples of the metal constituting the core material 322 include stainless steel, tungsten, copper, nickel, titanium, piano wire, cobalt-chromium alloy, nickel-titanium alloy (superelastic alloy), copper-zinc alloy, and amorphous alloy.
- Various metal strands such as can be used.
- the second resin 324 for example, those exemplified as those that can be used as the second resin in the above-described embodiment can be used.
- the tensile strength of the inner tube 300 can be further improved. Further, as shown in FIG. 8, a part of the second resin 324 is melted to form a portion 325 welded to the inner surface 111 of the tube body 110, so that the space between the linear body 321 and the tube body 110 is formed. Bonding strength is increased. Thereby, since the core material 322 is firmly fixed to the tube body 110, it can prevent suitably that problems, such as dispersion
- the core material 322 can be similarly provided for a linear body having a cross section formed in an elliptical shape, a rectangular shape, or other shapes.
- the reinforcing body can be constituted by a coiled linear body.
- the inner tube can be made flexible.
- the balloon catheter may be configured as a so-called over-the-wire type balloon catheter formed such that the guide wire lumen extends from the distal end of the shaft to the proximal end.
- the guide wire lumen is guided by adjusting the protruding length of the linear body in the vicinity of the distal end opening so as to be smaller than the second region located on the proximal end side. It is possible to suitably prevent the occurrence of catching or the like when inserting the wire.
- the balloon catheter has a configuration in which at least the linear body protrudes from the inner surface of the tube body in the second region and does not protrude from the inner surface of the tube body in the first region than the second region.
- the other configurations described in the embodiment can be changed as appropriate.
- the linear body may not be in a dissolved state in the third region, and the protruding length may not be adjusted based on the relationship with the first region or the second region.
- FIG. 9 to 11 are diagrams showing the configuration of each part of the medical long body according to the embodiment
- FIG. 11 is a diagram showing a configuration example of a linear body included in the reinforcing body according to the embodiment.
- FIG. 11A a part of the structure is enlarged and shown (a portion surrounded by a broken line in FIG. 11A).
- the medical long body 10 is inserted into a blood vessel, bile duct, trachea, esophagus, urethra, or other living body lumen or body cavity to perform treatment, diagnosis, or the like. It is configured as a catheter.
- the medical elongate body 10 includes a long catheter body 100 that can be introduced into a living body, a distal tip 150 attached to the distal end portion 103 of the catheter body 100, and the catheter body 100. And a hub 160 connected to the base end portion 104.
- the medical long body 10 includes a kink protector (strain relief) 170 in the vicinity of the connecting portion between the catheter body 100 and the hub 160.
- the side where the distal tip 150 is disposed in the catheter body 100 is referred to as the distal end side
- the side where the hub 160 is disposed in the catheter body 100 is referred to as the proximal end side
- the direction in which the catheter body 100 extends is the axis. It is called a direction.
- FIG. 10A is an enlarged cross-sectional view of the vicinity of the distal end portion 103 of the medical long body 10
- FIG. 10B is an enlarged cross-sectional view of the vicinity of the proximal end portion 104 of the medical long body 10.
- the catheter body 100 communicates with the lumen 101 extending in the axial direction, the distal end opening 103 a communicating with the lumen 101, and the lumen 101. It is configured as a flexible tubular member in which a proximal end opening 104a is formed.
- the catheter body 100 includes a tube body 110, a reinforcing body 120 disposed on the inner surface 111 of the tube body 110 that forms the lumen 101 of the catheter body 100 (see FIG. 11A), and the outside of the tube body 110. And an outer layer 130 disposed on the surface.
- the tube body 110 has a hollow tube shape extending in the axial direction of the catheter body 100. Similar to the tube body 110, the outer layer 130 has a hollow tube shape extending in the axial direction of the catheter body 100.
- the reinforcing body 120 is formed by a plurality of linear bodies 121 knitted.
- the reinforcing body 120 has a gap 123 formed between the knitted linear bodies 121.
- the reinforcing body 120 has a tube shape extending in the axial direction of the catheter body 100.
- the distal tip 150 attached to the catheter body 100 is provided with a tapered shape whose outer diameter decreases toward the distal end side.
- a through hole 151 that penetrates the tip tip 150 in the axial direction is formed inside the tip tip 150.
- the through-hole 151 allows a medical device such as a guide wire inserted into the lumen 101 of the catheter body 100 to be led out of the catheter body 100.
- the tip chip 150 can be formed of, for example, a flexible resin member having heat shrinkability.
- the material of the distal tip 150 is not particularly limited as long as it can be fixed to the catheter body 100.
- the distal tip 150 can be fixed to the catheter body 100 by fusion. As shown in FIG. 10A, the distal tip 150 is fixed in a state where the proximal end surface is abutted against the distal end surface of the catheter body 100.
- the fixation of the distal tip 150 is not limited to such a form.
- the distal tip 150 may be fixed in a state where the outer periphery of the distal end of the catheter body 100 is covered, or inside the distal end of the catheter body 100. It may be fixed in a state of entering.
- the hub 160 is used to check the orientation and the like when operating the port 161 having a function as an insertion port for inserting a medical device such as a guide wire into the lumen 101 of the catheter body 100 and the medical long body 10.
- the wing part 163 is provided.
- the hub 160 can be attached to cover the outer periphery of the proximal end portion 104 of the catheter body 100 using an adhesive, a fixture (not shown), or the like.
- a constituent material of the hub 160 for example, a thermoplastic resin such as polycarbonate, polyamide, polysulfone, polyarylate, or the like can be used.
- the tube body 110 has a convex portion 113 formed on the inner surface 111 of the tube body 110.
- the convex 113 protrudes radially inward (radially inward) from the inner surface 111 so as to enter the gap 123 formed in the reinforcing body 120.
- the shapes of the tube body 110, the reinforcing body 120, and the outer layer 130 are orthogonal to each other. However, the shape is not limited to a circle, and may be, for example, an ellipse or a rectangle. .
- the tube body 110 is made of a predetermined first resin.
- the linear body 121 is made of a predetermined second resin.
- the melting point of the first resin is lower than the melting point of the second resin. Then, as shown in FIG. 11A, the first resin constituting the tube body 110 is fused with the second resin in a state where the convex portion 113 enters the gap portion (mesh) 123 provided in the reinforcing body 120. ing.
- the convex portion 113 is formed by melting a part of the first resin constituting the tube body 110 and flowing into the gap portion 123.
- the cross-sectional shape of the convex portion 113 shown in the figure is an example, and the shape of the convex portion 113 can be changed as appropriate.
- the reinforcing body 120 has a function of increasing kink resistance and tensile strength of the catheter body 100 and a function of reducing sliding resistance of various medical devices inserted into the lumen 101 of the catheter body 100.
- the reinforcing body 120 is made of a resin having a melting point higher than that of the first resin constituting the tube body 110 in order to suitably exhibit the function of reducing the sliding resistance.
- the contact area between the inner surface 111 of the tube body 110 and the medical device is reduced, so that the sliding resistance is lowered.
- the reinforcing body 120 and the tube body 110 are heat-sealed by heating from the outer periphery of the tube body 110, a part of the reinforcing body 120 on the tube body 110 side of the reinforcing body 120 may be melted.
- the braided structure of the reinforcing body 120 for example, a 1 over 1 under structure in which the linear bodies 121 alternately intersect can be employed. However, it is not limited to such a structure.
- the linear body 121 can be formed of, for example, a wire having a round cross-sectional shape. By using a round wire, the contact area between the medical device inserted into the lumen 101 of the catheter body 100 and the reinforcing body 120 can be reduced, so that the sliding resistance can be more suitably reduced. It becomes possible.
- the linear body 121 can also be formed, for example with a wire with an elliptical cross-sectional shape. When an elliptical wire is used, the area of the portion where the wires overlap is increased, so that the rigidity of the reinforcing body 120 can be increased.
- the reinforcing body 120 can be formed of, for example, a wire having a rectangular cross-sectional shape, or may be formed by combining round shapes, elliptical shapes, rectangular shapes, and the like. It is also possible to configure with a wire rod.
- the outer diameter of the wire used is not particularly limited.
- modified polyethylene (melting point: about 128 ° C.) can be used.
- Examples of the second resin constituting the linear body 121 include polypropylene (melting point: about 168 ° C.), nylon 12 (melting point: about 179 ° C.), nylon 6 (melting point: about 225 ° C.), or nylon 66 (melting point: about 265 ° C.). Can be used. However, any resin having a higher melting point than the first resin constituting the tube body 110 may be used, and any resin can be selected according to the material of the tube body 110.
- the linear body 121 constituting the reinforcing body 120 is formed of only the second resin, when inserting a metal medical device such as a guide wire into the lumen 101 of the catheter body 100, Further, it is possible to suitably prevent the reinforcing body 120 and the guide wire from being scratched and causing the guide wire to be damaged or broken. Further, when the catheter body 100 is molded using a mold or the like, the tube body 110 and the linear body 121 are formed of only resin, and therefore the outer diameter, thickness, It is possible to adjust the hardness and the like. Therefore, the processability is excellent.
- the outer layer 130 is made of a resin having a melting point higher than that of the first resin constituting the tube body 110, as with the linear body 121.
- the resin constituting the outer layer 130 for example, the above-described resins exemplified as the resin constituting the linear body 121 can be used.
- any resin having a melting point higher than that of the first resin constituting the tube body 110 may be used, and an arbitrary one is selected according to the material of the tube body 110 as with the second resin constituting the linear body 121. be able to.
- the length d3 (see FIG. 11A) of the convex portion 113 of the portion that has entered the gap portion 123 is 2 of the thickness of the linear body 121 in the cross section perpendicular to the axial direction of the catheter body 100. It can be less than double. This is due to the following reason.
- the thickness of the reinforcing body 120 is the thickness (outer diameter) d1 of the linear body 121a and the thickness (outside) of the linear body 121a. It is a dimension obtained by adding (diameter) d2.
- the gap 123 if the length d3 of the convex portion 113 of the portion that has entered the gap 123 is less than the dimension obtained by adding the linear bodies 121a and 121b (less than twice the thickness of the linear body 121), the gap 123 Moreover, it can prevent that the convex part 113 protrudes to radial inside, and the sliding resistance which acts between the inner surface 111 of the tube body 110 and a medical device can be reduced suitably. Even if the cross-sectional shape of the linear body 121 is other than a round shape, the length d3 of the convex portion 113 of the portion that has entered the gap portion 123 is made smaller than the total thickness dimension of the similarly knitted portion. Thus, it is possible to suitably reduce the sliding resistance.
- FIG. 12B is a view showing a cross section of a portion where adjacent linear bodies 121a and 121b intersect (a cross-sectional view taken along line 12B-12B in FIG. 12A).
- a portion where the plurality of linear bodies 121a and 121b intersect with each other at least one of the linear bodies 121b has a recessed shape.
- FIG. 12B shows an example in which the concave portion 122 is formed only in one adjacent linear body 121b.
- the concave portion 122 may be formed by both heat application and stress application.
- the linear bodies 121a and 121b may be formed, or only the linear bodies 121a arranged on the outer surface side of the catheter body 100 may be formed.
- the depth, shape, and the like of the concave portion 122 can be changed as appropriate according to the conditions at the time of fusion, and thus are not limited to the illustrated shape.
- each linear body 121a, 121b is arrange
- the angle of the overlapping part (intersection part) of the linear bodies 121 changes suitably. Is possible.
- the catheter main body 100 has an intermediate portion extending between the distal end portion 103 provided with the distal end tip 150 and the proximal end portion 104 provided with the hub 160.
- Part 105 is provided.
- the linear body 121 protrudes from the inner surface 111 of the tube body 110 at the intermediate portion 105.
- the linear body 121 does not protrude from the inner surface 111 of the tube body 110 at the proximal end portion 104 than at the intermediate portion 105.
- the reason for adjusting the protruding length of the linear body 121 in each part of the catheter body 100 is as follows.
- the proximal end portion 104 of the catheter body 100 is formed with a proximal end opening portion 104 a that serves as an entrance when the medical device is inserted into the lumen 101 of the catheter body 100.
- a proximal end opening portion 104 a that serves as an entrance when the medical device is inserted into the lumen 101 of the catheter body 100.
- the medical device is caught by the linear body 121 when the medical device is inserted into the lumen 101. Problems such as hindering smooth insertion and scratching of the medical device may occur. Therefore, in the vicinity of the base end portion 104, the length of the linear body 121 protruding from the inner surface 111 is reduced.
- the linear body 121 arranged in the intermediate portion 105 is protruded radially inward from the inner surface 111 of the tube body 110 so that sliding resistance can be reduced.
- a melted portion 125 is formed by melting the linear body 121 disposed at the proximal end portion 104.
- the original shape of the linear body 121 does not remain.
- the melting part 125 is fused to the tube body 110.
- positioned at the base end part 104 is melt
- the length by which the linear body 121 protrudes at the base end portion 104 is not particularly limited as long as it is possible to prevent problems such as the medical device being caught.
- the protruding length of the linear body 121 may be made smaller than that of the intermediate portion 105, similarly to the proximal end portion 104. Even in such a configuration, it is possible to suitably prevent the linear body 121 and the medical device from being caught when the medical device is inserted into the lumen 101 via the distal end opening 103a.
- a melting portion 125 in which the linear body 121 is melted may be formed in the distal end portion 103. For example, when the distal tip 150 is attached to the catheter body 100 by fusion, the melting portion 125 can be formed when the distal tip 150 is attached.
- the medical long body 10 has the long catheter body 100.
- the catheter body 100 includes a tube body 110 made of a first resin and a reinforcing body 120 disposed on the inner surface 111 of the tube body 110 that forms the lumen 101 of the catheter body 100.
- the reinforcing body 120 is formed of a plurality of knitted linear bodies 121 and has a gap 123 between the knitted linear bodies 121.
- the tube body 110 has a convex portion 113 that enters the gap portion 123 on the inner surface 111 of the tube body 110.
- In the linear body 121 at least the outer peripheral surface of the linear body 121 is formed of the second resin.
- the first resin is fused with the second resin in a state where the convex portion 113 enters the gap portion 123.
- the melting point of the first resin is lower than the melting point of the second resin.
- the kink resistance and the tensile strength are improved by the reinforcing body 120 provided on the inner surface 111 of the tube body 110.
- the inner surface of the tube body 110 is provided by the reinforcing body (knitted linear body 121) 120 disposed on the inner surface 111 of the tube body 110.
- the contact area between 111 and the medical device is reduced. For this reason, in the medical device inserted into the lumen 101 of the catheter body 100, the sliding resistance with the inner surface 111 of the tube body 110 is reduced.
- both the tube body 110 and the reinforcement body 120 contain resin, the tube body 110 and the reinforcement body 120 are easily fused to each other as compared with the case where the reinforcement body 120 is made of metal. Further, the convex portion 113 made of the first resin enters the gap portion 123 of the second resin constituting the reinforcing body 120 and is fused, so that the contact area between the first resin and the second resin is increased, and the tube body. 110 and the reinforcement 120 can be firmly fused.
- the melting point of the first resin constituting the tube body 110 is lower than the melting point of the second resin included in the reinforcing body 120. For this reason, when arrange
- the reinforcing body 120 contains the second resin, the reinforcing body 120 and the tube body 110 are fused well. Therefore, when attaching the distal tip 150 or the hub 160 by cutting the end of the catheter body 100, it is not necessary to perform end processing so that the end of the reinforcing body 120 does not vary, and the manufacturing operation is easy. It becomes.
- the length of the convex portion 113 at the portion entering the gap portion 123 is less than twice the thickness of the linear body 121 in the cross section perpendicular to the axial direction of the catheter body 100.
- the convex part 113 protrudes to radial inside rather than the clearance gap part 123, and can reduce suitably the sliding resistance which acts between the inner surface 111 of the tube body 110 and a medical device. it can.
- the linear body 121 is constituted by a wire having a round cross-sectional shape. Therefore, the contact area between the medical device inserted through the lumen 101 of the catheter body 100 and the reinforcing body 120 can be reduced, and the sliding resistance can be more suitably reduced.
- the linear body 121 is composed only of the second resin.
- a metal medical device such as a guide wire
- the reinforcing body 120 and the guide wire are scratched and the guide wire is damaged or broken. Can be prevented.
- the tube body 110 and the linear body 121 are made of only resin when the catheter body 100 is molded using a mold or the like, the outer diameter, thickness, It is possible to adjust the hardness and the like. Therefore, the processability is excellent.
- the tube body 110 located in the outer layer of the reinforcing body 120 can be melted and the reinforcing body 120 and the outer layer 130 can be fused, the reinforcing body 120 can be used even when the melting points of the outer layer 130 and the reinforcing body 120 are close.
- the reinforcing body 120 can be joined to the outer layer 130 while suitably preventing the shape of the steel from being damaged.
- the reinforcing body 120 at least one of the linear bodies 121a and 121b is recessed at a portion where the linear bodies 121a and 121b intersect each other. Therefore, since the catch between the linear bodies 121a and 121b becomes strong, the tubular shape of the reinforcing body 120 can be kept even better.
- the catheter body 100 has a hub 160 that holds the proximal end of the catheter body 100, and further includes a distal end portion 103 provided with a distal tip 150, a proximal end portion 104 fixed to the hub 160, and a distal end portion. 103 and an intermediate portion 105 extending between the base end portion 104 and the base end portion 104.
- the linear body 121 protrudes from the inner surface 111 of the tube body 110 at the intermediate portion 105, and does not protrude from the inner surface 111 of the tube body 110 at the proximal end portion 104 than the intermediate portion 105. For this reason, the medical device can be smoothly moved in the intermediate portion 105 of the catheter body 100, and the medical device can be suitably prevented from being caught by the linear body 121 in the vicinity of the proximal end portion 104. ing.
- the catheter main body 200 may not include the outer layer 130. That is, the catheter body 200 can be configured by the tube body 110 made of the first resin and the reinforcing body 120. Even in such a configuration, the sliding resistance acting between the medical device can be reduced by melting a part of the tube body 110 and fusing the tube body 110 and the reinforcing body 120 together. It is possible to provide a possible medical elongated body 10. Moreover, since the number of members can be reduced by the amount not using the outer layer 130, it is possible to reduce the manufacturing cost.
- the linear body 321 constituting the reinforcing body 320 can be composed of, for example, a core material 322 made of metal and a second resin 324 that covers the outer peripheral surface of the core material 322. is there.
- Examples of the metal constituting the core material 322 include stainless steel, tungsten, copper, nickel, titanium, piano wire, cobalt-chromium alloy, nickel-titanium alloy (superelastic alloy), copper-zinc alloy, and amorphous alloy.
- Various metal strands such as can be used.
- the second resin for example, those exemplified as those that can be used as the second resin in the above-described embodiment can be used.
- the tensile strength of the catheter main body 300 can be further improved. Further, as shown in FIG. 14, a part of the second resin 324 is melted to form a portion 325 welded to the inner surface 111 of the tube body 110, so that the space between the linear body 321 and the tube body 110 is formed. Bonding strength is increased. Thereby, since the core material 322 is firmly fixed to the tube body 110, it can prevent suitably that problems, such as dispersion
- the core material 322 can be similarly provided for a linear body having a cross section formed in an elliptical shape, a rectangular shape, or other shapes.
- a medical elongated body can be used for the purpose of introducing a medical device (such as a guide wire or various medical instruments for treatment) into a living body, its specific use is particularly limited. None happen.
- the medical elongated body has at least the first resin and the first resin in a state where the melting point of the first resin is lower than the melting point of the second resin and the convex portion of the tube body enters the gap of the reinforcing body. It is only necessary to have a configuration in which the two resins are fused, and the other configurations described in the embodiment can be appropriately changed.
- catheter body having the tube body and the reinforcing body described in the second embodiment can be used as, for example, the inner tube (inner tube shaft) of the balloon catheter described in the first embodiment.
- 1 balloon catheter, 5 Balloon, 10 shaft 100, 200, 300 inner pipe, 101 guide wire lumen, 103 first region, 103a tip opening, 104 third region, 104a proximal opening, 105 second region, 110 tube body, 111 inner surface, 113 convex part, 120 reinforcement, 121, 121a, 121b, 321 linear body, 123 gap, 130 outer layer, 140 outer tube, 141 pressurized medium lumen; 150 tip, 160 hub, 322 core material, 324 second resin, W guide wire, A1 boundary between the first region and the second region, A2 The boundary between the second region and the third region, 10 Medical long body, 100, 200, 300 catheter body, 101 lumen, 103 tip, 103a tip opening, 104 proximal end, 104a proximal opening, 105 middle part, 110 tube body, 111 inner surface, 113 convex part, 120, 320 reinforcement, 121, 121a, 121b linear bodies, 122 recess, 123 gap, 130 outer layer,
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Abstract
Description
図1を参照して、本実施形態に係るバルーンカテーテル1は、長尺のシャフト10を生体器官に挿通させ、シャフト10の先端側に配置されたバルーン5を狭窄部(病変部)において拡張させることにより狭窄部を押し広げて治療する医療装置である。
次に、図7(A)、図7(B)を参照して、第1実施形態の変形例1に係る内管200を説明する。本変形例の説明においては、既に説明した部材と同一の機能を持つ部材等についてはその説明を省略する。
次に、図8を参照して、第1実施形態の変形例2に係る補強体320を説明する。本変形例の説明においては、既に説明した部材と同一の機能を持つ部材等についてはその説明を省略する。
以下、各図面を参照して、本発明の実施の形態を説明する。なお、図面の寸法比率は、説明の都合上誇張されており、実際の比率とは異なる場合がある。
次に、図13(A)、図13(B)を参照して、第2実施形態の変形例1に係るカテーテル本体200を説明する。本変形例の説明においては、既に説明した部材と同一の機能を持つ部材等についてはその説明を省略する。
次に、図14を参照して、第2実施形態の変形例2に係る補強体320を説明する。本変形例の説明においては、既に説明した部材と同一の機能を持つ部材等についてはその説明を省略する。
5 バルーン、
10 シャフト、
100、200、300 内管、
101 ガイドワイヤルーメン、
103 第1領域、
103a 先端開口部、
104 第3領域、
104a 基端開口部、
105 第2領域、
110 チューブ体、
111 内表面、
113 凸部、
120 補強体、
121、121a、121b、321 線状体、
123 隙間部、
130 外層、
140 外管、
141 加圧媒体ルーメン、
150 先端チップ、
160 ハブ、
322 芯材、
324 第2樹脂、
W ガイドワイヤ、
A1 第1領域と第2領域の境界、
A2 第2領域と第3領域の境界、
10 医療用長尺体、
100、200、300 カテーテル本体、
101 内腔、
103 先端部、
103a 先端開口部、
104 基端部、
104a 基端開口部、
105 中間部、
110 チューブ体、
111 内表面、
113 凸部、
120、320 補強体、
121、121a、121b 線状体、
122 凹部、
123 隙間部、
130 外層、
150 先端チップ、
160 ハブ、
321 線状体、
322 芯材、
324 第2樹脂。
Claims (19)
- 内腔を備える外管と、
前記外管の内腔に配置され、かつ、ガイドワイヤが挿通可能なガイドワイヤルーメンを備える内管と、
前記内管の先端側と前記外管の先端側とに固定されたバルーンと、を備えており、
前記内管の基端部は、前記外管の途中に前記ガイドワイヤルーメンに連通する基端開口部を形成するように設けられており、
前記内管は、第1樹脂からなるチューブ体と、前記チューブ体の内側に配置された補強体と、を備え、
前記補強体は、第2樹脂を有する線状体から構成されており、
前記内管は、先端開口部が形成された先端部を含む第1領域と、前記第1領域よりも基端側に配置される第2領域と、を有し、
前記線状体は、前記第2領域において、前記チューブ体の内表面から突出しており、かつ、前記第1領域において、前記第2領域よりも前記チューブ体の内表面から突出していない、ことを特徴とするバルーンカテーテル。 - 前記第1領域には、先端チップが配置されていることを特徴とする請求項1に記載のバルーンカテーテル。
- 前記第1領域と前記第2領域の境界部では、前記第2領域から前記第1領域に向かって、前記チューブ体の内表面から前記線状体の突出する長さが減少していることを特徴とする請求項1または請求項2に記載のバルーンカテーテル。
- 前記内管は、前記第2領域よりも基端側に配置される第3領域を有し、
前記線状体は、前記第3領域において、前記第2領域よりも前記チューブ体の内表面から突出していないことを特徴とする請求項1~3のいずれか1項に記載のバルーンカテーテル。 - 前記第2領域と前記第3領域の境界部では、前記第2領域から前記第3領域に向かって、前記チューブ体の内表面から前記線状体の突出する長さが減少していることを特徴とする請求項4に記載のバルーンカテーテル。
- 前記補強体は、編み込まれた複数の前記線状体で形成されることを特徴とする請求項1~5のいずれか1項に記載のバルーンカテーテル。
- 前記線状体は、丸形または楕円形の線材により構成されることを特徴とする請求項6に記載のバルーンカテーテル。
- 前記線状体は、金属からなる芯材と、前記芯材の外周面を被覆する前記第2樹脂とから構成されることを特徴とする請求項1~7のいずれか1項に記載のバルーンカテーテル。
- 前記線状体は、前記第2樹脂のみで構成されることを特徴とする請求項1~7のいずれか1項に記載のバルーンカテーテル。
- 前記第1樹脂よりも融点が高い樹脂で構成され、前記チューブ体の外表面に配置された外層を有することを特徴とする請求項1~9のいずれか1項に記載のバルーンカテーテル。
- 内腔を備える外管と、
前記外管の内腔に配置され、かつ、ガイドワイヤが挿通可能なガイドワイヤルーメンを備える内管と、
前記内管の先端側と前記外管の先端側とに固定されたバルーンと、を備えており、
前記内管の基端部は、前記外管の途中に前記ガイドワイヤルーメンに連通する基端開口部を形成するように設けられており、
前記内管は、第1樹脂からなるチューブ体と、前記チューブ体の内側に配置された補強体と、を備え、
前記補強体は、第2樹脂を有する線状体から構成されており、
前記内管は、先端開口部が形成された先端部を含む第1領域と、前記第1領域よりも基端側に配置される第2領域と、を有し、
前記第1領域は、前記第2領域よりも、前記チューブ体の前記第1樹脂と前記線状体の前記第2樹脂が溶融固化している、ことを特徴とするバルーンカテーテル。 - 長尺なカテーテル本体を有する医療用長尺体であって、
前記カテーテル本体は、第1樹脂からなるチューブ体と、前記カテーテル本体の内腔を形成する前記チューブ体の内表面に配置された補強体と、を備え、
前記補強体は、編み込まれた複数の線状体で形成されるとともに編み込まれた複数の前記線状体の間に隙間部を有し、
前記チューブ体は、前記チューブ体の内表面に、前記隙間部に入り込む凸部を有し、
前記線状体は、前記線状体の少なくとも外周面が第2樹脂で形成されており、
前記第1樹脂は、前記隙間部に前記凸部が入り込んだ状態で前記第2樹脂と融着されており、
前記第1樹脂の融点は前記第2樹脂の融点よりも低いことを特徴とする医療用長尺体。 - 前記隙間部に入り込んだ部分の前記凸部の長さは、前記カテーテル本体の軸方向に対して垂直な断面において、前記線状体の厚みの2倍未満であることを特徴とする請求項12に記載の医療用長尺体。
- 前記線状体は、断面形状が丸形または楕円形の線材により構成されることを特徴とする請求項12または請求項13に記載の医療用長尺体。
- 前記線状体は、金属からなる芯材と、前記芯材の外周面を被覆する前記第2樹脂とから構成されることを特徴とする請求項12~14のいずれか1項に記載の医療用長尺体。
- 前記線状体は、前記第2樹脂のみで構成されることを特徴とする請求項12~14のいずれか1項に記載の医療用長尺体。
- 前記第1樹脂よりも融点が高い樹脂で構成され、前記チューブ体の外表面に配置された外層を有することを特徴とする請求項12~16のいずれか1項に記載の医療用長尺体。
- 前記補強体は、複数の前記線状体同士が互いに交差する部分において、少なくとも一方の前記線状体が凹んでいることを特徴とする請求項12~17のいずれか1項に記載の医療用長尺体。
- 前記カテーテル本体の基端を保持するハブを有し、
前記カテーテル本体は、先端チップが設けられた先端部と、前記ハブに固定された基端部と、前記先端部と前記基端部との間に延在する中間部と、を有し、
前記線状体は、前記中間部において、前記チューブ体の内表面から突出しており、かつ、前記基端部において、前記中間部よりも前記チューブ体の内表面から突出していないことを特徴とする請求項12~18のいずれか1項に記載の医療用長尺体。
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EP16878646.5A EP3395395A4 (en) | 2015-12-21 | 2016-12-19 | BALLOON CATHETER AND MEDICAL ELONGATED BODY |
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JP2017558129A JP6831335B2 (ja) | 2015-12-21 | 2016-12-19 | バルーンカテーテル、および医療用長尺体 |
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JP6392965B1 (ja) * | 2017-11-02 | 2018-09-19 | コデン株式会社 | 留置装置及び留置システム |
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RU2738064C1 (ru) * | 2017-11-02 | 2020-12-07 | Коден Ко., Лтд. | Система размещения и устройство размещения катетера |
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JP2021053173A (ja) * | 2019-09-30 | 2021-04-08 | 日立金属株式会社 | 編組チューブ |
US11703157B2 (en) | 2019-09-30 | 2023-07-18 | Proterial, Ltd. | Braided tube |
WO2023119399A1 (ja) * | 2021-12-21 | 2023-06-29 | 朝日インテック株式会社 | 医療器具 |
Also Published As
Publication number | Publication date |
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US20180296795A1 (en) | 2018-10-18 |
CN108472474A (zh) | 2018-08-31 |
US10695531B2 (en) | 2020-06-30 |
JPWO2017110757A1 (ja) | 2018-10-11 |
JP6831335B2 (ja) | 2021-02-17 |
CN108472474B (zh) | 2021-03-19 |
EP3395395A1 (en) | 2018-10-31 |
EP3395395A4 (en) | 2019-06-12 |
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