WO2022239356A1 - バルーンカテーテル用バルーン及びバルーンカテーテルの製造方法 - Google Patents
バルーンカテーテル用バルーン及びバルーンカテーテルの製造方法 Download PDFInfo
- Publication number
- WO2022239356A1 WO2022239356A1 PCT/JP2022/006686 JP2022006686W WO2022239356A1 WO 2022239356 A1 WO2022239356 A1 WO 2022239356A1 JP 2022006686 W JP2022006686 W JP 2022006686W WO 2022239356 A1 WO2022239356 A1 WO 2022239356A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- balloon
- section
- proximal
- distal
- molecular orientation
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 229920005989 resin Polymers 0.000 claims description 34
- 239000011347 resin Substances 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000003892 spreading Methods 0.000 abstract description 3
- 230000007480 spreading Effects 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 description 13
- 238000005520 cutting process Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 229920001971 elastomer Polymers 0.000 description 7
- 239000000806 elastomer Substances 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 229920002647 polyamide Polymers 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 208000031481 Pathologic Constriction Diseases 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000012634 fragment Substances 0.000 description 4
- 229920001225 polyester resin Polymers 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 229920000299 Nylon 12 Polymers 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 3
- 238000002399 angioplasty Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000003902 lesion Effects 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 230000036262 stenosis Effects 0.000 description 3
- 208000037804 stenosis Diseases 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 210000004204 blood vessel Anatomy 0.000 description 2
- 238000000071 blow moulding Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920006146 polyetheresteramide block copolymer Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 229920000571 Nylon 11 Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 210000004351 coronary vessel Anatomy 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 208000010125 myocardial infarction Diseases 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000002966 stenotic effect Effects 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
Images
Classifications
-
- 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
- A61M25/1029—Production methods of the balloon members, e.g. blow-moulding, extruding, deposition or by wrapping a plurality of layers of balloon material around a mandril
-
- 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
-
- 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
- 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
- A61M25/104—Balloon catheters used for angioplasty
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/086—Biaxial stretching during blow-moulding mono-axial stretching, e.g. either length or width
-
- 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
- A61M2025/1043—Balloon catheters with special features or adapted for special applications
-
- 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
- A61M2025/1043—Balloon catheters with special features or adapted for special applications
- A61M2025/1084—Balloon catheters with special features or adapted for special applications having features for increasing the shape stability, the reproducibility or for limiting expansion, e.g. containments, wrapped around fibres, yarns or strands
-
- 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
- A61M2207/00—Methods of manufacture, assembly or production
- A61M2207/10—Device therefor
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/071—Preforms or parisons characterised by their configuration the preform being a tube, i.e. with both ends open
-
- 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 for a balloon catheter and a method for manufacturing a balloon catheter.
- Angioplasty in which a balloon catheter is inserted into the narrowed part of the blood vessel and the balloon is expanded to expand the blood vessel and secure blood flow, is widely performed as a minimally invasive therapy.
- Angioplasty is used, for example, for the treatment of diseases such as myocardial infarction caused by stenosis of the coronary arteries of the heart, and for the treatment of stenosis occurring in shunts for dialysis.
- the balloon of a balloon catheter usually has a cylindrical shape with tapered distal and proximal sides. It has a shape having a distal tapered portion and a distal tapered portion located on the distal side of the straight tube portion.
- Patent Literatures 1 to 3 propose balloons that have pressure resistance and are aimed at suppressing breakage in the circumferential direction.
- Patent document 1 describes a balloon in which the difference in the ratio of polymer chains oriented in the circumferential direction in the extended functional part is equal to or less than a predetermined value
- patent document 2 describes a balloon in which the number of circumferentially oriented polymer chains in the tubular part is oriented in the axial direction.
- Patent Document 3 a balloon in which the ratio of the orientation distribution number calculated by dividing by the distribution number is less than a predetermined position is described in Patent Document 3.
- a balloon that is less likely to burst is disclosed.
- an object of the present invention to provide a balloon for a balloon catheter capable of suppressing cracks in the circumferential direction by causing cracks in the longitudinal direction at the central portion of the balloon even if the balloon breaks. aim.
- the longitudinal cracks extend to the proximal end side and the distal end side of the balloon to form L-shaped cracks that become circumferential cracks at the ends.
- An object of the present invention is to provide a balloon for a balloon catheter that can prevent this.
- One embodiment of the balloon for a balloon catheter of the present invention which has solved the above problems, is a balloon made of a resin having molecular orientation, which is in an expanded state in the longitudinal axis direction and in a cross section perpendicular to the longitudinal axis direction. It has a circumferential direction along the outer periphery of the balloon, a straight tube portion, a proximal taper portion located proximal to the straight tube portion, and a proximal taper portion located distal to the straight tube portion. and a distal tapered portion that extends from the 0% position to the 10% position in the longitudinal axis direction when the proximal end of the straight tube portion is the 0% position and the distal end is the 100% position.
- the main orientation direction of the molecular orientation in the proximal section to the % position and the molecular orientation in the distal section from the 90% position to the 100% position is the circumferential direction, and the 40% position to the 60% position.
- the longitudinal component of molecular orientation in the central section to 1 is characterized by being greater than the longitudinal component of molecular orientation in the proximal and distal sections. In this way, when the longitudinal component of molecular orientation in the central section is larger than the longitudinal component of molecular orientation in the proximal section and the distal section, the balloon breaks due to overpressure or the like.
- the crack in the longitudinal direction can be triggered in the central section, and the internal pressure can be released by causing the crack in the longitudinal direction in the central section, so that the crack in the circumferential direction can be prevented.
- the longitudinal crack that occurs in the central section runs vigorously in the longitudinal direction beyond the proximal and distal sections, the relatively thick proximal and distal tapers will break. There is a risk of forming L-shaped cracks that result in circumferential cracks.
- the main orientation direction of the molecular orientation in the proximal section and the distal section is the circumferential direction, the longitudinal cracks that occur in the central section occur in the proximal direction.
- the main orientation direction of molecular orientation in the central section is preferably the longitudinal axis direction.
- the longitudinal component of the molecular orientation gradually decreases from the central section toward the 0% position and gradually decreases from the central section toward the 100% position.
- the main orientation direction of the molecular orientation in the central section is the longitudinal direction
- the section from the 10% position to the 40% position is the proximal intermediate section
- the section from the 60% position to the 90% position is the proximal intermediate section.
- the section to the position is the distal intermediate section
- the thickness of the balloon in the central section is preferably thinner than the thickness of the balloon in the proximal and distal sections.
- the present invention also provides a balloon catheter comprising the balloon for a balloon catheter.
- the present invention also provides a method for manufacturing the above balloon catheter.
- One embodiment of the method for manufacturing a balloon catheter according to the present invention comprises the steps of preparing a parison made of resin, having a lumen, and an inner wall surface forming the lumen. It has a straight tube portion, a proximal tapered portion located proximal to the straight tube portion, and a distal tapered portion located distal to the straight tube portion.
- a second stretching step of further stretching the parison, which has been stretched beyond the necking region after the first stretching step, in the longitudinal direction while heating the mold while the internal pressure of the parison is higher than that of the first stretching step; is characterized by including In many resins, in the stress-strain curve as shown in FIG. 1, in the region of elastic deformation up to the yield point B, stress acts so that the molecular chains in a bent state are extended. After the yield point B, plastic deformation begins in which the molecular chains attracted by the intermolecular force are displaced in the shear direction.
- Some resins exhibit a phenomenon that once the molecular chains begin to shift, the molecular chains loosen and the stress decreases to the lower yield point L. After that, a region showing a leveling off stress for some time is seen, and such a region is commonly referred to as necking region R n .
- necking region R n the strain causes the molecular chains to shift, resulting in a certain amount of stress. , that is, in a region beyond the necking region R n , the stress rises upward.
- the parison is first stretched in the longitudinal direction until it exceeds the necking region Rn, and in the subsequent second stretching step, the parison that has been stretched beyond the necking region Rn is further stretched in the longitudinal direction while the internal pressure is high.
- the main orientation direction of molecular orientation in the proximal section and distal section is the circumferential direction
- the longitudinal component of molecular orientation in the central section is It is possible to manufacture balloon catheters with more balloon catheter balloons than longitudinal components of molecular orientation.
- the parison in the first stretching step, is pressurized with a lower pressure than in the second stretching step, and further pressurized after passing over the necking region in the second stretching step.
- the above manufacturing method preferably includes a step of heating the mold so that the temperature is highest in the center of the straight tube portion of the mold.
- the balloon for a balloon catheter and the manufacturing method of the balloon catheter even if the balloon breaks, cracks in the circumferential direction can be suppressed by causing cracks in the longitudinal direction at the central portion of the balloon.
- the longitudinal cracks extend to the proximal end side and the distal end side of the balloon to form L-shaped cracks that become circumferential cracks at the ends. can be prevented. Therefore, even if the balloon breaks due to excessive pressurization or the like, it is possible to avoid the risk that fragments of the balloon will remain in the body due to circumferential cracks or L-shaped cracks.
- FIG. 1 represents a stress-strain curve of a polyester resin.
- 1 depicts a side view of a balloon catheter according to one embodiment of the present invention
- FIG. FIG. 4B shows a plan view of a balloon according to an embodiment of the present invention when a longitudinal crack occurs.
- FIG. 10 is a plan view showing an example when a circumferential crack occurs in the balloon;
- FIG. 10 is a plan view showing an example when an L-shaped crack occurs in the balloon;
- FIG. 10 is a plan view showing another example when an L-shaped crack occurs in the balloon;
- FIG. 4A is a view for explaining a method of manufacturing a sample for measuring the molecular orientation of the straight tube portion of the balloon according to one embodiment of the present invention.
- FIG. 4 shows a contour diagram obtained by measuring a balloon according to an embodiment of the present invention with a two-dimensional birefringence evaluation system
- FIG. 4 shows a phase difference graph obtained by measuring a balloon according to an embodiment of the present invention with a two-dimensional birefringence evaluation system
- FIG. 4 shows a graph of axial orientation obtained by measuring a balloon according to an embodiment of the present invention with a two-dimensional birefringence evaluation system
- FIG. 4B depicts a cross-sectional view showing the placement of a parison in a mold according to one embodiment of the present invention.
- FIG. 4 is a cross-sectional view showing a state in a first stretching step according to one embodiment of the present invention;
- FIG. 5B shows a cross-sectional view showing a state in a second stretching step according to one embodiment of the present invention.
- FIG. 4C is a cross-sectional view showing a state after the second stretching step according to one embodiment of the present invention is completed.
- 1 is a contour diagram of a balloon obtained in Example 1.
- FIG. 4 is a graph of the phase difference of the balloon obtained in Example 1.
- FIG. 4 is a graph of the axial orientation of the balloon obtained in Example 1.
- FIG. 4 is a graph showing the film thickness of the balloon obtained in Example 1.
- FIG. 4 is a contour diagram of a balloon obtained in Comparative Example 1.
- FIG. 4 is a graph of the phase difference of the balloon obtained in Comparative Example 1.
- FIG. 4 is a graph of the axial orientation of the balloon obtained in Comparative Example 1.
- FIG. 4 is a graph showing the film thickness of the balloon obtained in Comparative Example 1.
- FIG. 4 is a graph showing the film thickness of the balloon obtained in Comparative Example 1.
- a balloon for a balloon catheter according to an embodiment of the present invention is a balloon formed of a resin having molecular orientation, and in a cross section perpendicular to the longitudinal axis direction and the longitudinal axis direction, the outer circumference of the expanded balloon is a straight tube portion, a proximal tapered portion located proximal to the straight tube portion, and a distal side located distal to the straight tube portion.
- the main orientation direction of the molecular orientation in the proximal section and the molecular orientation in the distal section from the 90% position to the 100% position is the circumferential direction, and the central section from the 40% position to the 60% position
- the longitudinal component of molecular orientation in is characterized by being greater than the longitudinal component of molecular orientation in the proximal and distal sections.
- the balloon breaks due to overpressure or the like. Even if it is, the crack in the longitudinal direction can be triggered in the central section, and the internal pressure can be released by causing the crack in the longitudinal direction in the central section, so that the crack in the circumferential direction can be prevented.
- the longitudinal crack that occurs in the central section runs vigorously in the longitudinal direction beyond the proximal and distal sections, the relatively thick proximal and distal tapers will break. There is a risk of forming L-shaped cracks that result in circumferential cracks.
- the main orientation direction of the molecular orientation in the proximal section and the molecular orientation in the distal section is the circumferential direction, so that the longitudinal axis direction generated in the central section Even if the crack reaches the proximal side section and the distal side section, it can be prevented from spreading vigorously to the gold side taper portion and the distal side taper portion beyond the proximal side section and the distal side section.
- Directional cracks can be confined within the straight pipe portion, and formation of L-shaped cracks, which are circumferential cracks, at the proximal and distal tapers can be prevented. As a result, it is possible to avoid the risk of a fragment of the balloon remaining in the body due to circumferential cracks or L-shaped cracks.
- the balloon for balloon catheter may be simply referred to as "balloon”.
- FIG. 2 depicts a side view of a balloon catheter according to one embodiment of the present invention.
- FIG. 3 shows a plan view of a balloon according to an embodiment of the present invention when a crack occurs in the longitudinal direction
- FIG. 4 shows a plan view showing an example when a crack occurs in the balloon in the circumferential direction
- FIG. is a plan view showing an example of L-shaped cracks in the balloon
- FIG. 6 is a plan view showing another example of L-shaped cracks in the balloon.
- proximal side refers to the direction toward the hand side of the user or the operator with respect to the extending direction of the balloon catheter 1 or the longitudinal axis direction x of the shaft 3, and the term “distal side” refers to the direction opposite to the proximal side. It refers to the direction, that is, the direction of the person to be treated.
- Members other than elongated members such as the shaft 3 have the same longitudinal axis direction x as the shaft 3 .
- the direction connecting the center of the balloon 2 and the point on the circumscribed circle of the balloon 2 in the expanded state is the radial direction y
- the cross section perpendicular to the longitudinal axis direction x that is, the cross section in the radial direction y.
- a direction along the outer periphery of the balloon 2 in the state is referred to as a circumferential direction z.
- the balloon catheter 1 has a shaft 3 and a balloon 2 provided on the distal side of the shaft 3.
- the balloon 2 has a longitudinal direction x, a radial direction y, and a circumferential direction z, and is preferably shaped like a cylinder with openings on the proximal and distal sides, respectively.
- the balloon 2 is made of resin having molecular orientation.
- the balloon catheter 1 is configured such that fluid is supplied to the inside of the balloon 2 through the shaft 3, and the expansion and contraction of the balloon 2 can be controlled using an indeflator (balloon pressurizer/decompressor).
- the fluid may be a pressurized fluid pressurized by a pump or the like.
- the balloon 2 includes a straight tube portion 23, a proximal tapered portion 22 located proximal to the straight tube portion 23, and a distal tapered portion located distal to the straight tube portion 23. a portion 24;
- the straight pipe portion 23 preferably has approximately the same diameter in the longitudinal direction x, and the proximal side taper portion 22 and the distal side taper portion 24 are formed so as to decrease in diameter as they separate from the straight pipe portion 23. preferably. Since the straight tube portion 23 has the maximum diameter, when the balloon 2 is expanded in a lesion such as a stenotic portion, the straight tube portion 23 sufficiently contacts the lesion and treatment such as expansion of the lesion is performed. can be easily performed.
- the outer diameters of the proximal end portion and the distal end portion of the balloon 2 are reduced when the balloon 2 is deflated. can be reduced to reduce the step between the shaft 3 and the balloon 2, so that the balloon 2 can be easily inserted into the body cavity.
- the balloon 2 may have a proximal sleeve portion 21 and a distal sleeve portion 25 proximal to the proximal tapered portion 22 and distal to the distal tapered portion 24, respectively. good. At least a portion of the proximal sleeve portion 21 and the distal sleeve portion 25 may be configured to be fixed to the shaft 3 .
- the longitudinal direction x when the proximal end of the straight tube portion 23 is the 0 % position D0 and the distal end is the 100 % position D100, from the 0 % position D0 to the 10 % position D10 and the molecular orientation in the distal section 23e from the 90% position D 90 to the 100% position D 100 is the circumferential direction z, and the 40% position D
- the longitudinal x component of molecular orientation in central section 23c from 40 to 60 % position D60 is greater than the longitudinal x component of molecular orientation in proximal section 23a and distal section 23e.
- the main orientation direction of the molecular orientation in the proximal section 23a and the distal section 23e is the circumferential direction z
- cracks in the longitudinal axis direction x occurring in the central section 23c are Even if it reaches the side section 23e, it can be prevented from reaching the proximal side tapered portion 22 and the distal side tapered portion 24 beyond the proximal side section 23a and the distal side section 23e.
- cracks in the longitudinal direction x can be contained within the straight pipe portion 23, and the relatively thick proximal side taper portion 22 and the distal side taper portion 24 form an L-shaped crack in the circumferential direction. Formation of cracks can be prevented.
- FIG. 7 shows diagrams for explaining a method of preparing a sample for measuring the molecular orientation of the straight tube portion 23 of the balloon 2 according to one embodiment of the present invention.
- FIG. 8 shows an example of a contour diagram obtained by measuring a balloon according to an embodiment of the present invention with a two-dimensional birefringence evaluation system manufactured by Photonic Lattice, and
- FIGS. 4 illustrates an example of a resulting phase difference graph and an example of an axis orientation graph;
- the molecular orientation of the straight tube portion 23 can be measured on a rectangular sample of the straight tube portion 23 using a two-dimensional birefringence evaluation system manufactured by Photonic Lattice.
- a rectangular sample, as shown in FIG. 7, is obtained by cutting off the proximal side tapered portion 22 and the distal side tapered portion 24 from the balloon 2 along the first cutting line S1, and cutting the obtained straight tube portion 23 along the longitudinal axis. It is obtained by cutting along the second cutting line S2 in the direction x.
- FIG. 8 shows an example of a contour diagram obtained as a measurement result
- FIGS. 9 and 10 show examples of a phase difference graph and an axial orientation graph, respectively, obtained as a result of line analysis in the longitudinal axis direction x.
- the left end corresponds to the position D 0 where the straight pipe portion 23 is 0%
- the right end corresponds to the position D 100 where the straight pipe portion 23 is 100%.
- the magnitude of the phase difference is represented by color contrast, and the alignment state can be visually confirmed. Then, it is possible to specifically obtain information on the strength of the orientation from the graph of the phase difference, and information on the direction of the orientation from the graph of the axial orientation.
- the principal orientation direction can be determined from the axis orientation graph.
- the main orientation direction is the circumferential direction z.
- the length of the line included in the range of 80° to 100° in the predetermined section is shorter than the length of the line included in the range of 0° to 10° and the range of 170° to 180°
- the main orientation direction in the section is the longitudinal axis direction x.
- the intensity of the orientation component can be obtained from the phase difference graph.
- the graph of the axial orientation shows 0° to 10° in each section. and the range of 170 ° to 180 °, and determine that the section with the longest length of the included line is the section with a large component in the longitudinal axis direction x of the orientation direction be able to.
- the main orientation direction of the molecular orientation in the proximal side section 23a and the distal side section 23e is the circumferential direction z. Recognize.
- the main orientation direction of the molecular orientation in the central section 23c is the longitudinal axis direction x
- the component of the longitudinal axis direction x of the molecular orientation in the central section 23c is the direction of the molecular orientation in the proximal side section 23a and the distal side section 23e. It can be seen that there are more than the components in the longitudinal axis direction x. Furthermore, from the graph of the phase difference, it can be seen that the orientation intensity decreases from the central section 23c toward the proximal side and the distal side, that is, the component of the molecular orientation in the longitudinal axis direction x decreases.
- the main orientation direction of molecular orientation in the central section 23c is preferably the longitudinal axis direction x. Since the main orientation direction is the longitudinal axis direction x, even if the balloon 2 is destroyed due to excessive pressure or the like, it becomes easier to cause cracks in the longitudinal axis direction x in the central section 23c. . As a result, cracks in the longitudinal axis direction x occur in the central section 23c, allowing the internal pressure to escape, so that cracks in the circumferential direction z can be more easily prevented.
- the longitudinal x component of the molecular orientation tapers off from the central section 23c towards the 0% position D 0 and from the central section 23c towards the 100% position D 100 .
- the component in the longitudinal axis direction x of the molecular orientation can be maximized in the central section 23c, making it easier to cause cracks in the longitudinal axis direction x in the central section 23c. Since the internal pressure can be released by the occurrence of cracks in the direction x, cracks in the circumferential direction z can be more easily prevented.
- That the component of the molecular orientation in the longitudinal direction x gradually decreases from the central section 23c toward the 0% position D 0 is, for example, a 40% position D 40 , a 20% position, and a 0% position D
- the component of the longitudinal axis direction x of the molecular orientation at 0 is compared, it is sufficient that the component of the longitudinal axis direction x of the molecular orientation decreases in order, and the component of the longitudinal axis direction x of the molecular orientation gradually decreases from the central section 23c toward the 100 % position D100.
- the component of the molecular orientation in the longitudinal axis direction x does not have to decrease continuously toward the proximal side or the distal side from the section 23c.
- the component of the molecular orientation in the longitudinal axis direction x may continuously decrease as it goes proximally or distally from the central section 23c.
- the main orientation direction of the molecular orientation preferably changes from the longitudinal axis direction x to the circumferential direction z.
- FIG. 10 A change in the main orientation direction of molecular orientation can be known from the axis orientation graph.
- the main orientation direction of molecular orientation changes from the longitudinal axis direction x to the circumferential direction z in the proximal intermediate section 23b and the distal intermediate section 23d.
- the thickness of the balloon 2 in the central section 23c is preferably thinner than the thickness of the balloon 2 in the proximal section 23a and the distal section 23e. Since the film thickness of the central section 23c is thin, it becomes easier to cause cracks in the longitudinal axis direction x in the central section 23c. becomes easier.
- the balloon 2 may have a protrusion that protrudes outward in the radial direction y from the outer surface and extends in the longitudinal axis direction x. It is preferable that the protrusions are provided on the outer surface of the balloon 2 in a dot-like, linear, or net-like pattern. By providing the protrusions on the outer surface of the balloon 2, the protrusions have a scoring function, and it becomes possible to crack and dilate a calcified stricture in angioplasty. In addition, it is possible to increase the strength of the balloon 2 and suppress excessive expansion during pressurization.
- Examples of materials for forming the balloon 2 include polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymers, polyester resins such as polyethylene terephthalate and polyester elastomers, polyurethane resins such as polyurethane and polyurethane elastomers, and polyphenylene sulfide.
- polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymers
- polyester resins such as polyethylene terephthalate and polyester elastomers
- polyurethane resins such as polyurethane and polyurethane elastomers
- polyphenylene sulfide polyphenylene sulfide.
- polyamide-based resins, polyamide-based resins such as polyamide elastomers, fluorine-based resins, silicone-based resins, and natural rubbers such as latex rubbers. These may use only 1 type and may use 2 or more types together.
- an elastomer resin from the viewpoint of thinning the balloon 2 and flexibility.
- nylon 12 nylon 12 is more suitable because it can be shaped relatively easily during blow molding.
- polyamide elastomers such as polyether ester amide elastomers and polyamide ether elastomers are preferably used.
- a polyether ester amide elastomer is preferably used because of its high yield strength and good dimensional stability of the balloon 2 .
- the balloon 2 can be manufactured by placing a parison made of the above material in a mold and biaxially stretch blow molding it. A preferred method for manufacturing the balloon 2 will be described later in the section "3. Method for manufacturing a balloon catheter".
- the balloon catheter of the present invention comprises the balloon for balloon catheter described above.
- a balloon catheter according to an embodiment of the present invention can be understood with reference to the above section "1. Balloon for balloon catheter" and FIG.
- Materials constituting the shaft 3 include, for example, polyamide-based resins, polyester-based resins, polyurethane-based resins, oliolefin-based resins, fluorine-based resins, vinyl chloride-based resins, silicone-based resins, and natural rubber. These may use only 1 type and may use 2 or more types together. Among them, the material constituting the shaft 3 is preferably at least one of polyamide resin, polyolefin resin, and fluorine resin. As a result, the slipperiness of the surface of the shaft 3 can be enhanced, and the insertability of the balloon catheter 1 within the body cavity can be improved.
- the balloon 2 and the shaft 3 may be joined by bonding with an adhesive, welding, or crimping by attaching a ring-shaped member to the portion where the end of the balloon 2 and the shaft 3 are overlapped. Above all, it is preferable that the balloon 2 and the shaft 3 are joined by welding. Since the balloon 2 and the shaft 3 are welded together, even if the balloon 2 is repeatedly expanded and contracted, the joint between the balloon 2 and the shaft 3 is unlikely to be released, and the joint strength between the balloon 2 and the shaft 3 can be easily increased. can.
- a hub 4 may be provided on the proximal side of the shaft 3 , and the hub 4 communicates with the flow path of the fluid supplied to the inside of the balloon 2 . It is preferable to have an injection part 6 . Further, the hub 4 may be provided with a guide wire insertion portion 5 that communicates with the insertion passage of the guide wire. With such a configuration, it is possible to easily perform an operation to expand and contract the balloon 2 by supplying fluid to the inside of the balloon 2 and an operation to deliver the balloon catheter 1 to the treatment site along the guidewire.
- FIG. 2 shows a so-called over-the-wire type balloon catheter 1 in which a guide wire is passed through the shaft 3 from the distal side to the proximal side. It can also be applied to a so-called rapid exchange type balloon catheter in which a guide wire is inserted halfway from the side to the proximal side.
- the joint between the shaft 3 and the hub 4 can be, for example, bonding with an adhesive, welding, or the like. Above all, it is preferable that the shaft 3 and the hub 4 are joined by adhesion.
- the shaft 3 and the hub 4 are made of a highly flexible material and the hub 4 is made of a highly rigid material. 4, the durability of the balloon catheter 1 can be enhanced by increasing the bonding strength between the shaft 3 and the hub 4.
- One embodiment of the method for manufacturing a balloon catheter of the present invention includes the steps of preparing a parison made of resin, and having a lumen, the inner wall surface of which forms the lumen being a straight pipe. a proximal tapered portion located proximal to the straight pipe portion; and a distal tapered portion located distal to the straight pipe portion. placing the parison in the mold; a first stretching step of stretching the parison in the longitudinal direction while heating the mold until it exceeds the necking region of the stress-strain curve; After the first stretching step, the parison stretched beyond the necking region is further stretched in the longitudinal direction while the internal pressure of the parison is higher than that in the first stretching step.
- the strain causes the molecular chains to shift, resulting in a certain amount of stress. , the stress rises to the right in a region exceeding a predetermined strain, that is, beyond the necking region R n .
- the parison is first stretched in the longitudinal direction until it exceeds the necking region Rn .
- the main orientation direction of molecular orientation in the proximal section and distal section is the circumferential direction, and the longitudinal component of molecular orientation in the central section is It is possible to manufacture balloon catheters with more balloon catheter balloons than longitudinal components of molecular orientation.
- FIG. 11 represents a cross-sectional view showing a state in which a parison is placed in a mold according to one embodiment of the present invention.
- FIG. 12 represents a cross-sectional view showing a state in which the parison is longitudinally stretched beyond the necking region of the stress-strain curve while the mold is heated in the first stretching step according to one embodiment of the present invention.
- FIG. 13 shows that the parison, which has been stretched beyond the necking region while heating the mold in the second stretching step according to one embodiment of the present invention, is stretched in the longitudinal direction in a state where the internal pressure of the parison is higher than that in the first stretching step.
- a cross-sectional view showing a further stretched state is shown.
- FIG. 14 represents a cross-sectional view showing the state after the second stretching step is completed.
- the parison 70 is a tubular member having a bore 71 and can be made by extrusion, for example.
- the parison 70 has one end and the other end and extends in a longitudinal direction x from one end to the other end.
- the cross-sectional shape of the parison 70 in the direction perpendicular to the longitudinal axis direction x, that is, in the radial direction y, may be substantially the same in the longitudinal axis direction x.
- the cross-sectional shape of the parison 70 in the radial direction y may differ depending on the position in the longitudinal axis direction x.
- a part of the parison 70 for example, a part corresponding to the straight pipe part 23, the proximal tapered part 22, and the distal tapered part 24 of the balloon 2, has a larger outer diameter than other parts.
- the inner wall surface forming the lumen 88 includes a straight tube portion 83, a proximal side taper portion 82 located on the proximal side of the straight tube portion 83, and a straight tube portion.
- a mold 80 having a distal tapered portion 84 positioned distally of the tubular portion 83 is prepared.
- the inner wall surface forming the lumen 88 of the mold 80 is located distal to the proximal sleeve portion 81 and distal tapered portion 84, which are located proximal to the proximal tapered portion 82. It may also have a distal sleeve portion 85 that extends.
- the mold 80 may be formed from one member, or may be formed from a plurality of members.
- the mold 80 may be formed from a plurality of half-split bodies, or a plurality of mold members may be formed so as to be splittable in the longitudinal axis direction x.
- the parison 70 is placed in the lumen 88 of the mold 80 as shown in FIG. At this time, if the parison 70 has a part with a large outer diameter, that is, the outer diameter is large, it is preferable that the portion is positioned in the straight tube portion 83 of the mold 80 . This makes it easy to make the relevant portions the straight tube portion 23 , the proximal tapered portion 22 , and the distal tapered portion 24 of the balloon 2 .
- a first stretching step is performed in which the parison 70 is stretched in the longitudinal direction x while the mold 80 is heated. At this time, the parison 70 is stretched until it exceeds the necking region R n of the stress-strain curve of the resin forming the parison 70 .
- the necking region R n is the region where the stress levels off after the yield point B and the lower yield point L, as described above. ing. In the first drawing step, it is important to draw the parison 70 beyond such necking region R n .
- the parison 70 in the first drawing process is lower than the internal pressure of the parison 70 in the second drawing process, the parison 70 is restrained from being stretched in the circumferential direction z in the above state until the necking region R n is exceeded. It can be stretched in the longitudinal direction x while being stretched.
- the parison 70 When the parison 70 is prepared by being stretched in the longitudinal direction x to some extent, such as when the parison 70 is produced by extrusion molding, the parison 70 is stretched in the longitudinal direction x until it exceeds the necking region R n in the first stretching step.
- the amount to be used depends on the conditions of preparation of the parison 70, such as extrusion. That is, when the parison 70 has already been stretched in the longitudinal direction x to some extent by extrusion molding or the like, the necking region R n can be formed even if the amount of stretching the parison 70 in the longitudinal direction x in the first stretching step is correspondingly smaller. can exceed.
- the mold 80 is heated and the parison 70 stretched to exceed the necking region R n is stretched so that the internal pressure of the parison 70 is higher than that in the first stretching step.
- a second stretching step is performed in which the film is further stretched in the longitudinal direction x in this state.
- the resin in which the molecular chains of the resin are close to each other and densely oriented is further stretched in the longitudinal direction x.
- the internal pressure of the parison 70 is higher in the second stretching process than in the first stretching process, stretching of the parison 70 in the circumferential direction z is suppressed in the first stretching process until the necking region R n is exceeded, and the longitudinal direction of the parison 70 is suppressed. While the parison 70 has been stretched in the x direction, the parison 70 is also stretched in the longitudinal direction x while being stretched in the circumferential direction z in the second stretching step beyond the necking region R n .
- the main orientation direction of the molecular orientation in the proximal section 23a and the molecular orientation in the distal section 23e is the circumferential direction z, and the molecular orientation in the central section 23c It is possible for the balloon 2 to have a greater longitudinal x component of molecular orientation than the longitudinal x component of the molecular orientation in the proximal section 23a and the distal section 23e.
- the stress-strain curve shown in FIG. 1 clearly shows the constant stress necking region R n , but for some resins the constant stress region may be short or not completely flat.
- the first point at which the differential coefficient of the stress-strain curve has a value of 5% or more of the average rate of change up to the yield point B is defined as the necking region R n .
- the first drawing step may be performed until the strain is exceeded.
- the heating temperature in the first stretching process and the second stretching process can be up to around the glass transition temperature of the resin forming the balloon 2 .
- a known heater or the like can be used as appropriate.
- the fluid is introduced into the lumen 71 of the parison 70 and the interior of the parison 70 is pressurized, and the pressure at that time is preferably 3 MPa or less.
- the lumen 71 of the parison 70 and the outside of the parison 70 may be at the same pressure, ie the lumen 71 of the parison 70 may be unpressurized.
- the fluid is introduced into the lumen 71 of the parison 70 and the inside of the parison 70 is pressurized.
- 1 MPa or more is preferable, 1.5 MPa or more is more preferable, and 2 MPa or more is even more preferable.
- it is preferably 5 MPa or less, more preferably 4.5 MPa or less, even more preferably 4 MPa or less, and may be 3 MPa or less.
- the parison 70 is not pressurized in the first stretching step, and pressurization of the parison 70 is started after the necking region R n is passed in the second stretching step.
- the main orientation direction of the molecular orientation in the proximal section 23a and the molecular orientation in the distal section 23e is the circumferential direction z
- the component of the longitudinal axis direction x of the molecular orientation in the central section 23c is the proximal section It is easier to have a balloon 2 with more than a longitudinal x component of molecular orientation in 23a and distal section 23e.
- the balloon 2 can be made such that the component of the longitudinal axis direction x of the molecular orientation in the central section 23c of the balloon 2 is larger than the component of the longitudinal axis direction x of the molecular orientation in the proximal side section 23a and the distal side section 23e. It becomes easier to make the balloon 2 thinner in the central section 23c than in the proximal section 23a and the distal section 23e.
- Example 1 Polyamide 12 was extruded to make a parison.
- the parison was placed in a mold, and while the mold was heated to 70° C., an internal pressure of 2 MPa was applied to the parison to stretch it in the longitudinal direction until it exceeded the necking region of the stress-strain curve. Next, while the mold was heated to 70° C., an internal pressure of 4.3 MPa was applied to the parison to stretch it in the longitudinal direction to obtain a balloon.
- the main orientation direction of molecular orientation in the central section of the straight tube portion is the longitudinal axis direction, and the main orientation direction of molecular orientation is in the circumferential direction in the proximal side section and the distal side section of the straight tube section. was stably obtained.
- the proximal section (1), the proximal intermediate section (2), the central section (3), the distal intermediate section (4), and the distal section (5) The film thickness was measured using a Mitutoyo spline micrometer SPM2-25MX. The results are shown in FIG. In all the balloons, the thickness of the central section was the thinnest, and the thickness of the balloon increased from the central section toward the proximal side and the distal side.
- a further 30 balloons were produced in the same manner as in Example 1. Internal pressure was continuously applied to these 30 balloons until they broke, and after breaking, the state of cracks was observed to confirm the presence or absence of cracks in the circumferential direction. No circumferential cracks occurred in any of the balloons.
- Comparative example 1 A parison was prepared as in Example 1. A parison was placed in the same lumen of the mold as in Example 1, and while the mold was heated to 60° C., a pressure of 3.5 MPa was applied to the lumen of the parison and stretched in the longitudinal direction to obtain a balloon.
- the proximal section (1), the proximal intermediate section (2), the central section (3), the distal intermediate section (4), and the distal section (5) The film thickness was measured using a Mitutoyo spline micrometer SPM2-25MX. The results are shown in FIG. It was found that the film thickness in the longitudinal direction varied depending on the balloon, and that the method of Comparative Example 1 could not control the film thickness in the longitudinal direction.
- a further 30 balloons were produced in the same manner as in Comparative Example 1. Internal pressure was continuously applied to these 30 balloons until they broke, and after breaking, the state of cracks was observed to confirm the presence or absence of cracks in the circumferential direction. Circumferential cracks occurred in 3 of the 30 balloons.
- Balloon catheter 2 Balloon 3: Shaft 4: Hub 5: Guide wire insertion part 6: Fluid injection part 21: Proximal side sleeve part 22: Proximal side tapered part 23: Straight tube part 23a: Proximal side section 23b : proximal intermediate section 23c: central section 23d: distal intermediate section 23e: distal section 24: distal taper 25: distal sleeve 70: parison 71: parison lumen 80: mold 81: mold proximal sleeve portion 82: mold proximal taper portion 83: mold straight tube portion 84: mold distal taper portion 85: mold distal sleeve portion 88: Mold lumen B: Yield point D0: 0 % position D10: 10 % position D40: 40 % position D60: 60 % position D90: 90 % position D100: 100 % position Position L: Lower yield point Rn: Necking area S1: First cutting line S2: Second cutting
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Pulmonology (AREA)
- Child & Adolescent Psychology (AREA)
- Biophysics (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Manufacturing & Machinery (AREA)
- Vascular Medicine (AREA)
- Epidemiology (AREA)
- Mechanical Engineering (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
Description
本発明の実施形態に係るバルーンカテーテル用バルーンは、分子配向を有する樹脂で形成されたバルーンであって、長手軸方向と長手軸方向に垂直な断面において拡張状態のバルーンの外周に沿う周方向を有しており、直管部と、直管部よりも近位側に位置している近位側テーパー部と、直管部よりも遠位側に位置している遠位側テーパー部と、を有しており、長手軸方向において、直管部の近位端を0%の位置とし遠位端を100%の位置としたとき、0%の位置から10%の位置までの近位側区間における分子配向及び90%の位置から100%の位置までの遠位側区間における分子配向の主配向方向は周方向であり、40%の位置から60%の位置までの中央区間における分子配向の長手軸方向成分は、近位側区間及び遠位側区間における分子配向の長手軸方向成分よりも多いことに特徴を有する。このように、中央区間における分子配向の長手軸方向成分が近位側区間及び遠位側区間における分子配向の長手軸方向成分よりも多いことで、バルーンが過加圧等により破壊してしまう場合であっても中央区間で長手軸方向割れのきっかけを作ることができ、中央区間で長手軸方向割れが生じることで内圧を逃すことができるため周方向割れを防止できる。また、中央区間で生じた長手軸方向割れが近位側区間及び遠位側区間を越えて勢いよく長手軸方向に走ると、比較的肉厚な近位側テーパー部及び遠位側テーパー部で周方向割れとなるL字形割れを形成するおそれがある。しかし、本発明の実施形態に係るバルーンカテーテル用バルーンは、近位側区間における分子配向及び遠位側区間における分子配向の主配向方向が周方向であることにより、中央区間で生じた長手軸方向割れが近位側区間及び遠位側区間に達したとしても近位側区間及び遠位側区間を越えて金側テーパー部及び遠位側テーパー部まで勢いよく及ぶことを防止できるため、長手軸方向割れを直管部内に留めることができ、近位側テーパー部及び遠位側テーパー部で周方向割れとなるL字形割れを形成することを防止できる。その結果、周方向割れやL字形割れによりバルーンの断裂片が体内に残存してしまうリスクを回避することが可能となる。本明細書において、バルーンカテーテル用バルーンを単に「バルーン」と称することがある。
本発明のバルーンカテーテルは、上記バルーンカテーテル用バルーンを備えている。本発明の実施形態に係るバルーンカテーテルは、上記「1.バルーンカテーテル用バルーン」の項及び図2を参照して理解できる。
本発明のバルーンカテーテルの製造方法の一実施形態は、樹脂で構成されるパリソンを準備するステップと、内腔を有しており、当該内腔を形成する内壁面が直管部と、直管部よりも近位側に位置している近位側テーパー部と、直管部よりも遠位側に位置している遠位側テーパー部と、を有している金型を準備するステップと、金型内にパリソンを配置するステップと、金型を加熱しながら、パリソンを、長手軸方向に応力歪曲線のネッキング領域を超えるまで延伸させる第1延伸工程と、金型を加熱しながら、第1延伸工程の後に、ネッキング領域を超えるまで延伸されたパリソンを、第1延伸工程よりもパリソンの内圧が高い状態で長手軸方向にさらに延伸させる第2延伸工程と、を含むことに特徴を有する。多くの樹脂では、図1に示すような応力歪み曲線において、降伏点Bまでの弾性変形の領域では、折れ曲がった状態の分子鎖が伸びるように応力が働く。降伏点B以降は、分子間力で引き合っていた分子鎖同士がせん断方向にずれる塑性変形が始まる。分子鎖が一旦ずれ始めると分子鎖に緩みが生じ応力が下降伏点Lまで減少する現象を示す樹脂もある。その後は暫く横ばいの応力を示す領域が見られ、このような領域は通常ネッキング領域Rnと称される。ネッキング領域Rnでは歪みにより分子鎖がずれることで一定の応力を示していたところ、所定の歪み以上になると分子鎖同士が接近して密に配向し分子鎖間に強い分子間力が生まれるため、所定の歪み以上、すなわちネッキング領域Rnを超えた領域では応力は右肩上がりで上昇する。第1延伸工程では、ネッキング領域Rnを超えるまでまずパリソンを長手軸方向に延伸させ、その後の第2延伸工程でネッキング領域Rnを超えるまで延伸されたパリソンを内圧が高い状態でさらに長手軸方向に延伸させることで、近位側区間及び遠位側区間における分子配向の主配向方向は周方向であり、中央区間における分子配向の長手軸方向成分が近位側区間及び遠位側区間における分子配向の長手軸方向成分よりも多いバルーンカテーテル用バルーンを備えるバルーンカテーテルを製造することが可能となる。
ポリアミド12を押出成形してパリソンを作製した。金型内にパリソンを配置し、金型を70℃に加熱しながらパリソンに2MPaの内圧を加えて長手軸方向に応力歪み曲線のネッキング領域を超えるまで延伸させた。次に、金型を70℃に加熱しながらパリソンに4.3MPaの内圧を加えて長手軸方向に延伸しバルーンを得た。
実施例1と同様にパリソンを準備した。実施例1と同じ金型の内腔にパリソンを配置し、金型を60℃に加熱しながらパリソンの内腔に3.5MPaの圧力を加えながら長手軸方向に延伸しバルーンを得た。
2:バルーン
3:シャフト
4:ハブ
5:ガイドワイヤ挿入部
6:流体注入部
21:近位側スリーブ部
22:近位側テーパー部
23:直管部
23a:近位側区間
23b:近位側中間区間
23c:中央区間
23d:遠位側中間区間
23e:遠位側区間
24:遠位側テーパー部
25:遠位側スリーブ部
70:パリソン
71:パリソンの内腔
80:金型
81:金型の近位側スリーブ部
82:金型の近位側テーパー部
83:金型の直管部
84:金型の遠位側テーパー部
85:金型の遠位側スリーブ部
88:金型の内腔
B:降伏点
D0:0%の位置
D10:10%の位置
D40:40%の位置
D60:60%の位置
D90:90%の位置
D100:100%の位置
L:下降伏点
Rn:ネッキング領域
S1:第1切断線
S2:第2切断線
x:長手軸方向
y:径方向
z:周方向
Claims (9)
- 分子配向を有する樹脂で形成されたバルーンであって、長手軸方向と、前記長手軸方向に垂直な断面において拡張状態の前記バルーンの外周に沿う周方向を有しており、
直管部と、前記直管部よりも近位側に位置している近位側テーパー部と、前記直管部よりも遠位側に位置している遠位側テーパー部と、を有しており、
前記長手軸方向において、前記直管部の近位端を0%の位置とし遠位端を100%の位置としたとき、
0%の位置から10%の位置までの近位側区間における前記分子配向及び90%の位置から100%の位置までの遠位側区間における前記分子配向の主配向方向は前記周方向であり、
40%の位置から60%の位置までの中央区間における前記分子配向の長手軸方向成分は、前記近位側区間及び前記遠位側区間における前記分子配向の長手軸方向成分よりも多いバルーンカテーテル用バルーン。 - 前記中央区間における前記分子配向の主配向方向は、前記長手軸方向である請求項1に記載のバルーンカテーテル用バルーン。
- 前記分子配向の前記長手軸方向成分は、前記中央区間から前記0%の位置に向かって漸減し、前記中央区間から前記100%の位置に向かって漸減している請求項1又は2に記載のバルーンカテーテル用バルーン。
- 10%の位置から40%の位置までの区間を近位側中間区間、60%の位置から90%の位置までの区間を遠位側中間区間としたとき、
前記近位側中間区間及び前記遠位側中間区間において、前記分子配向の主配向方向が前記長手軸方向から前記周方向に変わる請求項2又は3に記載のバルーンカテーテル用バルーン。 - 前記中央区間の前記バルーンの膜厚は、前記近位側区間及び前記遠位側区間の前記バルーンの膜厚よりも薄い請求項1~4のいずれか一項に記載のバルーンカテーテル用バルーン。
- 請求項1から5のいずれか一項に記載のバルーンを備えるバルーンカテーテル。
- 請求項6に記載のバルーンカテーテルの製造方法であって、
樹脂で構成されるパリソンを準備するステップと、
内腔を有しており、前記内腔を形成する内壁面が直管部と、前記直管部よりも近位側に位置している近位側テーパー部と、前記直管部よりも遠位側に位置している遠位側テーパー部と、を有している金型を準備するステップと、
前記金型内に前記パリソンを配置するステップと、
前記金型を加熱しながら、前記パリソンを、前記長手軸方向に応力歪曲線のネッキング領域を超えるまで延伸させる第1延伸工程と、
前記金型を加熱しながら、前記第1延伸工程の後に、前記ネッキング領域を超えるまで延伸された前記パリソンを、前記第1延伸工程よりも前記パリソンの内圧が高い状態で前記長手軸方向にさらに延伸させる第2延伸工程と、を含むバルーンカテーテルの製造方法。 - 前記第1延伸工程において前記パリソンは前記第2延伸工程よりも低い圧力で加圧され、前記第2延伸工程において前記ネッキング領域を超えてからさらに加圧される請求項7に記載のバルーンカテーテルの製造方法。
- 前記金型の前記直管部の中央部が最も高温となるように前記金型を加熱するステップを含む請求項7又は8に記載のバルーンカテーテルの製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023520794A JPWO2022239356A1 (ja) | 2021-05-10 | 2022-02-18 | |
CN202280033550.6A CN117241843A (zh) | 2021-05-10 | 2022-02-18 | 球囊导管用球囊及球囊导管的制造方法 |
EP22807063.7A EP4338766A1 (en) | 2021-05-10 | 2022-02-18 | Balloon for balloon catheter and method for manufacturing balloon catheter |
US18/387,737 US20240075258A1 (en) | 2021-05-10 | 2023-11-07 | Balloon for balloon catheter and method of manufacturing balloon catheter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021079672 | 2021-05-10 | ||
JP2021-079672 | 2021-05-10 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US18/387,737 Continuation US20240075258A1 (en) | 2021-05-10 | 2023-11-07 | Balloon for balloon catheter and method of manufacturing balloon catheter |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022239356A1 true WO2022239356A1 (ja) | 2022-11-17 |
Family
ID=84029029
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/006686 WO2022239356A1 (ja) | 2021-05-10 | 2022-02-18 | バルーンカテーテル用バルーン及びバルーンカテーテルの製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20240075258A1 (ja) |
EP (1) | EP4338766A1 (ja) |
JP (1) | JPWO2022239356A1 (ja) |
CN (1) | CN117241843A (ja) |
WO (1) | WO2022239356A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023176182A1 (ja) * | 2022-03-14 | 2023-09-21 | 株式会社カネカ | バルーンカテーテル用バルーン |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0938195A (ja) * | 1995-08-04 | 1997-02-10 | Kanegafuchi Chem Ind Co Ltd | カテーテルバルーン及びその製造方法 |
JP2004298354A (ja) | 2003-03-31 | 2004-10-28 | Nippon Zeon Co Ltd | 拡張用バルーンおよびこれを備えたバルーンカテーテル |
JP2005305187A (ja) * | 2005-07-07 | 2005-11-04 | Kaneka Corp | カテーテルバルーン及びその製造方法 |
JP2008000553A (ja) | 2006-06-26 | 2008-01-10 | Asahi Intecc Co Ltd | バルーンカテーテルの製造方法及びバルーンカテーテル |
WO2013118807A1 (ja) * | 2012-02-09 | 2013-08-15 | 株式会社カネカ | バルーン用チューブ、バルーン、バルーンカテーテル、および、バルーン用チューブの製造方法 |
WO2014141382A1 (ja) | 2013-03-12 | 2014-09-18 | テルモ株式会社 | バルーンおよびその製造方法 |
JP2021079672A (ja) | 2019-11-22 | 2021-05-27 | 京セラドキュメントソリューションズ株式会社 | 画像形成装置、通信制御方法 |
-
2022
- 2022-02-18 EP EP22807063.7A patent/EP4338766A1/en active Pending
- 2022-02-18 WO PCT/JP2022/006686 patent/WO2022239356A1/ja active Application Filing
- 2022-02-18 JP JP2023520794A patent/JPWO2022239356A1/ja active Pending
- 2022-02-18 CN CN202280033550.6A patent/CN117241843A/zh active Pending
-
2023
- 2023-11-07 US US18/387,737 patent/US20240075258A1/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0938195A (ja) * | 1995-08-04 | 1997-02-10 | Kanegafuchi Chem Ind Co Ltd | カテーテルバルーン及びその製造方法 |
JP2004298354A (ja) | 2003-03-31 | 2004-10-28 | Nippon Zeon Co Ltd | 拡張用バルーンおよびこれを備えたバルーンカテーテル |
JP2005305187A (ja) * | 2005-07-07 | 2005-11-04 | Kaneka Corp | カテーテルバルーン及びその製造方法 |
JP2008000553A (ja) | 2006-06-26 | 2008-01-10 | Asahi Intecc Co Ltd | バルーンカテーテルの製造方法及びバルーンカテーテル |
WO2013118807A1 (ja) * | 2012-02-09 | 2013-08-15 | 株式会社カネカ | バルーン用チューブ、バルーン、バルーンカテーテル、および、バルーン用チューブの製造方法 |
WO2014141382A1 (ja) | 2013-03-12 | 2014-09-18 | テルモ株式会社 | バルーンおよびその製造方法 |
JP2021079672A (ja) | 2019-11-22 | 2021-05-27 | 京セラドキュメントソリューションズ株式会社 | 画像形成装置、通信制御方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023176182A1 (ja) * | 2022-03-14 | 2023-09-21 | 株式会社カネカ | バルーンカテーテル用バルーン |
Also Published As
Publication number | Publication date |
---|---|
CN117241843A (zh) | 2023-12-15 |
JPWO2022239356A1 (ja) | 2022-11-17 |
EP4338766A1 (en) | 2024-03-20 |
US20240075258A1 (en) | 2024-03-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9579492B2 (en) | Method for forming catheter balloon | |
JP5895017B2 (ja) | 高い強度および柔軟性を有するバルーンカテーテルシャフトおよびその製造方法 | |
US6706010B1 (en) | Balloon catheter and method of production thereof | |
JP4948791B2 (ja) | バルーンカテーテルのシャフトの構造 | |
US8088121B2 (en) | Catheter | |
JP6234923B2 (ja) | カテーテル用医療チューブ | |
US20210113820A1 (en) | Balloon catheter | |
WO2006134638A1 (ja) | バルーンカテーテル | |
US20090254113A1 (en) | Dilatation balloon with ridges and methods | |
WO2022239356A1 (ja) | バルーンカテーテル用バルーン及びバルーンカテーテルの製造方法 | |
JP2008110132A (ja) | カテーテル | |
JP6259560B2 (ja) | バルーンカテーテル用バルーン | |
JP5732259B2 (ja) | カテーテル | |
JP5066992B2 (ja) | バルーンカテーテル | |
JP6898232B2 (ja) | 加圧拘束アニーリングを利用する入れ子式バルーンを製造する方法 | |
US20090234282A1 (en) | Outer Catheter Shaft to Balloon Joint | |
JP4815657B2 (ja) | 医療用ポリマーブレンド材料およびこの材料を用いた医療用バルーン | |
US20220096804A1 (en) | Balloon catheter | |
WO2015146259A1 (ja) | バルーンカテーテル、およびバルーンの製造方法 | |
JP2004298354A (ja) | 拡張用バルーンおよびこれを備えたバルーンカテーテル | |
WO2023176182A1 (ja) | バルーンカテーテル用バルーン | |
JP2023183917A (ja) | バルーンカテーテル用バルーンの製造方法 | |
JP6184070B2 (ja) | バルーンカテーテル用バルーンの製造方法 | |
JP2004298356A (ja) | 拡張用バルーンおよびこれを備えたバルーンカテーテル | |
RU2814999C2 (ru) | Баллонный катетер |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22807063 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023520794 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280033550.6 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022807063 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2022807063 Country of ref document: EP Effective date: 20231211 |