JP5334781B2 - Balloon catheter - Google Patents

Description

  The present invention relates to a catheter having a balloon which is introduced into a body percutaneously and transluminally and used for treatment of an intravascular stenosis or for closure of a body lumen.

  2. Description of the Related Art Conventionally, a catheter including a balloon that is inserted into a predetermined position in a blood vessel such as a blood vessel and expands the balloon as necessary is used.

  Angioplasty (PTA: Percutaneous Transluminal Angioplasty, PTCA) that expands the balloon at high pressure to the stenosis or occlusion site of the blood vessel to improve blood flow on the peripheral side of the blood vessel when stenosis or occlusion occurs in the blood vessel Percutaneous Transluminal Coronary Angioplasty) is generally implemented in many medical institutions. A general surgical example using an angioplasty balloon catheter is as follows. First, the guide catheter is inserted from the puncture site such as the femoral artery, brachial artery, and radial artery, the tip is positioned at the entrance of the coronary artery via the aorta, and then the guide wire penetrating the balloon catheter is constricted or occluded. Advance beyond. Thereafter, the balloon catheter is advanced along the guide wire, the balloon is expanded at a high pressure in a state where the balloon is positioned at the stenosis site or the occlusion site, and treatment is performed by expanding the stenosis site or the occlusion site from the inside. After the treatment, the procedure is completed by deflating the balloon and removing it from the body.

  When performing these angioplasty procedures, blood flow is temporarily blocked, and the peripheral site falls into an ischemic state. In particular, in the case of vascular occlusion or stenosis in the carotid artery or cerebral artery, blood flow to the brain stops while the procedure is performed. In order to examine in advance whether the treatment target is resistant to this procedure, a method (BOT: Balloon Oclusion Test) is used to check the resistance by occluding the blood vessels in front of the treatment site for a certain period of time. . In BOT, a balloon is expanded in a normal blood vessel, and it is necessary to minimize damage to the blood vessel. Therefore, a balloon that can be expanded at a low pressure (an occlusion balloon catheter) is widely used.

  In addition to the BOT, the occlusion balloon catheter has an occlusion of the normal blood vessel for the purpose of preventing the outflow of the drug to the normal blood vessel or the arterial wall under pressure due to the blood flow when administering the drug to the lesion site. When an embolic material is delivered to a thinned aneurysm, it is used in various applications such as vascular occlusion for the purpose of reducing or blocking the blood flow and improving the operability of the procedure.

  In general, when a balloon is expanded using these various balloon catheters, physiological saline mixed with a contrast agent is used in order to ensure visibility in the body. Thereby, it becomes possible to confirm the shape and size of the balloon from the X-ray contrast image of the balloon, and the balloon catheter can be used safely. However, if bubbles remain in the balloon, the X-ray contrast image becomes unclear and it may be difficult to use the balloon catheter safely. In addition, when the balloon is ruptured for some reason, there is a possibility that bubbles may be mixed into the blood. In order to solve such a problem, various techniques for simply removing bubbles remaining in the balloon have been disclosed.

  In Patent Document 1, a balloon inflating liquid injection sub-passage that extends from the proximal end side to the distal end side of the catheter body and communicates with the internal space of the balloon, and an air exhaust sub-passage in the balloon and the sub-passage are provided. The injection sub-passage is provided with a valve element that opens when the syringe is attached and closes when the syringe is not attached, and the base end of the exhaust sub-passage is a closed end that can communicate with the outside. A balloon catheter is disclosed.

  In this prior art, in addition to the infusion lumen communicating with the balloon, by providing an exhaust lumen communicating with the infusion lumen on the catheter tip side, it is possible to easily remove bubbles remaining in the balloon. It has become. However, the catheter design with the addition of the exhaust lumen presents a profile increase problem. That is, adding one exhaust lumen to increase the profile causes the inconvenience that it becomes difficult to insert the balloon catheter when it is used in a narrow body cavity or a stenotic site of a blood vessel.

  In Patent Document 2, an inflatable / deflatable balloon mounted on the outer periphery in the vicinity of the distal end portion, a main lumen, an infusate passage through which an infusate for inflating the balloon passes, and fluid from the infusate passage to the outside of the catheter are further provided. There is disclosed a balloon catheter that is provided with a one-way valve that allows the fluid to flow out and prevents the fluid from flowing into the infusate passage from the outside of the catheter.

  In this prior art, the purge hole formed in the outer tube is closed with a purge hole cover, so that a one-way valve is provided outside the shaft, and bubbles remaining in the balloon can be easily removed. However, even in this structure, since the one-way valve is provided outside the shaft, an increase in the catheter profile is inevitable.

  On the other hand, in Patent Document 3, a liquid leakage prevention member made of an elastic body is provided so as to close the rear end opening of the balloon portion, and the liquid leakage prevention member is slit in the liquid leakage prevention member so as to communicate with the inside of the balloon. Alternatively, a balloon with a liquid leakage prevention member having a pinhole formed therein, wherein the slit or pinhole is spontaneously closed by detaching the small diameter passage member after filling the balloon with liquid through the small diameter passage member. A catheter is disclosed.

  This prior art has a structure in which a liquid leakage prevention member made of an elastic body is provided in the rear end portion of the balloon portion, so that an increase in profile can be prevented, but a method of sealing a slit or pinhole by the elastic force of the elastic body Then, it is difficult to completely prevent liquid leakage.

JP 59-177704 A JP 2005-103120 A Japanese Utility Model Publication No. 63-88350

  In view of the above problems, an object of the present invention is to realize a balloon catheter that can easily remove bubbles remaining in a balloon without a design with an increased profile.

  As a result of intensive studies to solve the above problems, the present invention has been completed. That is, the present invention has an expandable and contractible balloon disposed on the outer periphery of the catheter distal side, a hub disposed at the proximal end of the catheter, and an inflation lumen for allowing fluid to communicate from the hub to the inside of the balloon. A balloon catheter having at least a main body shaft, and a swellable resin that swells by contact with a liquid is disposed on a distal end side of the inflation lumen, and the inflation lumen and the outside of the catheter communicate with each other. The present invention relates to a balloon catheter.

  The present invention provides a balloon catheter that can easily remove bubbles remaining in a balloon without a design with an increased profile. According to the present invention, it is possible to easily remove bubbles remaining in the balloon through the hole, and after the removal of the bubble, the hole is sealed by swelling of the swellable resin. Can prevent blood from entering. Further, since the swellable resin can be disposed inside the inflation lumen, the profile does not increase as in the prior art.

1 is a partial schematic side view (a) showing a longitudinal section of a balloon catheter in which a swellable resin having two holes is provided at the tip of an inflation lumen, which is an embodiment of the balloon catheter according to the present invention, a balloon before liquid injection FIG. 5B is a sectional end view (b) of the catheter cross section I, and a sectional end view (c) of the section I of the balloon catheter in which the distal end of the inflation lumen is sealed by swelling of the swellable resin after liquid injection. 1 is an example of a balloon catheter according to the present invention, in which a swellable resin with a hole is embedded in a balloon resin, disposed on the distal end side of an inflation lumen, and an inner shaft having a guide wire lumen therein Partially schematic side view (a) showing a longitudinal section of a balloon catheter provided inside the body shaft, cross-sectional end view (b) of section II of balloon catheter before liquid injection, swelling of swellable resin after liquid injection FIG. 6C is a cross-sectional end view (c) of the cross-section II of the balloon catheter with the inflation lumen sealed at the end. FIG. 2 is an example of a system including a balloon catheter according to the present invention, in which a swellable resin having a hole is disposed on a distal end side of an inflation lumen, and a main body shaft is formed by a tube having a guide wire lumen parallel to the inflation lumen. It is the partial schematic side view which shows the longitudinal cross-section of the comprised balloon catheter, and the perspective view of the liquid injector arrange | positioned through the hole of swelling resin. 1 is an example of a balloon catheter according to the present invention, in which a swellable resin with a hole is embedded in a shaft resin and arranged on the distal end side of an inflation lumen, an inner shaft having a guide wire lumen inside FIG. 4 is a partially schematic side view (a) showing a longitudinal section of a balloon catheter provided inside the inflation lumen of the main body shaft and further having a working lumen on the main body shaft, and a cross-sectional view (b) of the cross section III. . It is a schematic perspective view of an OTW type among the balloon catheters according to the present invention. It is a RX type schematic perspective view among the balloon catheters concerning this invention.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. A balloon catheter according to the present invention includes a balloon 1, a main body shaft 2, an inflation lumen 3, and a swelling resin 4 and a swelling resin which are disposed on the distal end side of the inflation lumen 3 as shown in FIG. 4 includes at least an inflation lumen 5 and a hole 5 communicating with the outside of the catheter, and a hub 9 disposed at the proximal end of the catheter as shown in FIGS.

  In the embodiment shown in FIGS. 1, 2, and 4, bubbles remaining in the balloon can be removed from the proximal side of the catheter by injecting liquid from a hub (not shown). On the other hand, in the embodiment shown in FIG. 3, by using the liquid injector 8 arranged so as to pass through the hole 5, it is possible to remove bubbles remaining in the balloon from the catheter tip side. After the bubbles are removed, the liquid injector 8 is removed from the hole 5 to complete preparation for use in the body. In any embodiment, after the bubbles are removed, the swellable resin 4 comes into contact with the injected liquid to swell, and the hole 5 is sealed.

  In Patent Document 2, air bubbles are removed by a one-way valve provided in the catheter. However, when the injection pressure of the balloon is increased, there is a problem that liquid leakage occurs from the injection liquid passage to the outside of the catheter. Since Patent Document 3 has a structure in which the rear end opening of the balloon portion is closed with an elastic body in which slits or pinholes are formed, there is a concern about the problem of liquid leakage as in Patent Document 2. In the present invention, since the hole 5 does not physically exist while the liquid is in contact with the swellable resin 4, liquid leakage and blood intrusion into the shaft can be reliably prevented. From this, even if the injection pressure of the balloon 1 increases, there is no concern about the leakage of the balloon 1, and it can be applied not only to an occlusion balloon catheter that expands at a low pressure but also to an angioplasty balloon catheter that expands at a high pressure. is there.

  As for the material of the swellable resin 4, it is only necessary that the hole 5 be sealed by swelling after filling the inside of the catheter with a liquid. Specific examples include polyvinyl alcohol (PVA), PVA cross-linked polymer, PVA water-absorbing gel freeze-thaw elastomer, ethylene vinyl alcohol copolymer and other polyvinyl alcohol polymers, swellable polyamide resins, and swellable polyester resins. , Polyhydroxyethyl methacrylate, polyacrylic acid, sodium polyacrylate, polyacrylamide, poly-N-vinylpyrrolidone, polyvinyl methyl ether, polyethylene oxide, polyethylene glycol, polyglycolic acid, methyl vinyl ether maleic anhydride copolymer, poly Hydroxyethyl phthalate, polydimethylol propionate, methyl isopropyl ketone formaldehyde, polyethyleneimine, polystyrene sulfonate, water-soluble Niro Synthetic polymer materials such as carboxymethyl starch, dialdehyde starch, celluloses (CMC, MC, HEC, HPC), tannin, lignin, alginic acid, gum arabic, guar gum, tragacanth gum, gelatin, casein, glue, collagen, etc. Natural polymer substances can be exemplified.

  With respect to the arrangement of the swellable resin 4 in the catheter, it may be arranged on the distal end side inside the inflation lumen 3 as shown in FIG. 1, and the inflation lumen 3 with a structure embedded in the balloon resin as shown in FIG. It may be disposed on the distal end side of the inflation lumen 3, or may be disposed on the distal end side of the inflation lumen 3 in a structure embedded in the shaft resin as shown in FIG. Moreover, even if it has arrange | positioned at the front end side of the inflation lumen | rumen 3 with structures other than these, the effect of invention is not restrict | limited at all. In view of the risk of the swellable resin 4 falling off the catheter, a structure embedded in the balloon resin and the shaft resin is preferable. In particular, in an angioplasty balloon catheter that is expanded at a high pressure, the risk of dropping off increases due to the pressure in the catheter, and therefore the swellable resin 4 may have a structure embedded in the balloon resin and the shaft resin. preferable. As for the attachment method of the swellable resin 4, it may be embedded in these by a method such as melting of the balloon resin or the shaft resin, and if it can be welded to the balloon resin or the shaft resin, a welding method may be adopted. Adhesion with an adhesive may be performed, and attachment by any other method does not limit the effect of the invention.

  There is no limitation on the size, shape, number, etc., of the hole 5 through which the inflation lumen 3 provided in the swellable resin 4 communicates with the outside of the catheter. The time from the start of the swelling of the swellable resin 4 by the liquid injection to the completion of the sealing of the hole 5 depends on the swelling performance of the swellable resin 4, but the sealing is completed within about 30 minutes for the hole 5. The design of the hole 5 is preferred so that treatment can begin. In the case of balloon catheters that are used in situations where treatment is urgently needed, the design is such that the hole 5 is sealed in about 5 minutes in order to prevent deterioration of the symptoms of the patient being treated due to delay in treatment start. preferable. 1-4, in the embodiment of FIGS. 1 to 4, the hole 5 is arranged in parallel to the catheter from the distal end of the inflation lumen 3 to the outside of the catheter in the axial direction. For example, the hole 5 communicates from the distal end of the inflation lumen 3 to the side surface of the body shaft 2. It may be arranged in such a way that it may be arranged, and other arrangements may be used as long as the bubble can be easily removed.

  Although the profile of the body shaft 2 of the balloon catheter is not particularly limited, the narrower the profile, the better the passage through a stenosis site or an occlusion site in the case of an angioplasty balloon catheter, and the peripheral profile in the case of an occlusion balloon. Reachability to blood vessels is improved. The profile of the main body shaft 2 needs to be selected in consideration of the radial cross-sectional area of the inflation lumen 3 that greatly affects the response of expansion / contraction of the balloon 1 and the pressure resistance of the main body shaft 2. As an example of the profile of the balloon catheter, the outer diameter is 1.20 mm or less in the case of an angioplasty balloon catheter for the heart, and the outer diameter is 1.80 mm or less in the case of a peripheral angioplasty balloon catheter. In the case of an occlusion balloon catheter, the outer diameter is preferably 1.50 mm or less, but is not particularly limited.

  As a means for improving the operability of the balloon catheter, a guide wire is generally used, and a structure having a guide wire lumen is employed in many catheters. However, in Patent Document 1, since the exhaust sub-passage is provided in addition to the liquid injection sub-passage and the guide wire lumen (main passage), an increase in the profile of the entire catheter is expected. Therefore, although the operability by using the guide wire is improved, it is conceivable that the passability and reachability of the catheter are lowered due to an increase in the profile. In Patent Document 2, in addition to the injection liquid passage and the guide wire lumen (main lumen), the one-valve formed by closing the purge hole with the purge hole cover is provided outside the shaft. There arises a problem that the profile of the portion increases. Therefore, similarly to Patent Document 1, there arises a problem that the passability and reachability of the catheter are lowered. In the present invention, even if the structure includes an inflation lumen and a guide wire lumen as shown in FIGS. 2 and 3, the swelling resin 4 is disposed in the inflation lumen, thereby preventing an increase in profile. Therefore, it is possible to design a catheter that is excellent in passability and reachability, and also excellent in operability by using a guide wire. Further, by preventing the profile from increasing, for example, as shown in FIG. 4, a work lumen (for example, a drug injection lumen) other than the guide wire lumen 7 is added while maintaining passability and reachability. Is also possible.

  As for the catheter structure provided with the guide wire lumen, a structure in which an inner shaft 6 having a guide wire lumen 7 inside as shown in FIGS. 2 and 4 is provided inside the main body shaft 2 or as shown in FIG. Even if it is a structure in which the main body shaft 1 is constituted by a tube provided with a guide wire lumen 7 in parallel with the inflation lumen 3 or a structure other than these, the effect of the invention is not limited at all. As for the guide wire lumen 7, a guide wire lumen as shown in FIG. 5 extends from the proximal end portion of the catheter to the distal end side and has a proximal end side opening 7b at the proximal end portion of the hub. -It may be arranged in the wire type (OTW type), or a proximal end side opening 7b of the guide wire lumen as shown in FIG. It may be arranged in a high-speed exchange type (RX type). Further, other structures may be used as long as the operability of the catheter is improved.

  As a manufacturing method of the balloon 1, there are dipping molding, blow molding and the like, and an appropriate method can be selected according to the use application. In the case of an angioplasty balloon catheter, blow molding is preferred in order to obtain sufficient pressure strength. An example of the manufacturing method of the balloon 1 by blow molding is shown below. First, a tubular parison having an arbitrary size is formed by extrusion molding or the like. The tubular parison is placed in a mold having a mold that matches the shape of the balloon, and stretched in the axial direction and the radial direction by a biaxial stretching process, thereby forming the balloon 1 having the same shape as the mold. In addition, a biaxial stretching process may be performed on a heating condition and may be performed in multiple times. Further, the axial stretching may be performed simultaneously with or before or after the radial stretching. Furthermore, an annealing process may be performed to stabilize the shape and dimensions of the balloon 1. In the case of an occlusion balloon catheter, it is possible to manufacture the balloon 1 by processing a dipped or extruded tube in addition to blow molding.

  The resin used for manufacturing the balloon 1 is not particularly limited. For example, polyolefin, polyolefin elastomer, polyester, polyester elastomer, polyamide, polyamide elastomer, polyurethane, polyurethane elastomer, polyethylene terephthalate, styrene olefin rubber, etc. can be used. A blend material obtained by mixing two or more types of these resins or a material having a multilayer structure in which two or more types are laminated may be used.

  The material of the main body shaft 2 or the inner shaft 6 is not particularly limited. That is, resins such as polyolefin, polyolefin elastomer, polyester, polyester elastomer, polyamide, polyamide elastomer, polyurethane, polyurethane elastomer, and various metals can be used.

  As a material constituting the hub 9, resins such as polycarbonate, polyamide, polyurethane, polysulfone, polyarylate, styrene-butadiene copolymer, and polyolefin can be suitably used.

  Although not shown in FIGS. 1-6, the balloon catheter which concerns on this invention may be provided with the core wire and the radiopaque marker. The role of the core wire is to improve the operability when pushing the balloon catheter from the outside of the body along the guide wire and to prevent kinking of the balloon catheter. Absent. The dimensions and attachment positions of the core wire can also be determined in consideration of the dimensions and materials of the main body shaft 2 and the inner shaft 6, the purpose of use of the balloon catheter, and the like. The radiopaque marker may be provided for the purpose of improving the visibility of a specific part of the balloon catheter and easily positioning the balloon catheter during the treatment using the balloon catheter according to the present invention. The radiopaque marker may be any material that has radiopacity, and any type of material such as metal or resin may be used. Further, the position, the number, and the like of the balloon catheter can be set according to the purpose of use of the balloon catheter.

  A hydrophilic coating can be applied to the outer surface of the balloon catheter for the purpose of facilitating insertion into a blood vessel or a guide catheter. That is, it is possible to apply a hydrophilic coating that exhibits lubricity when it comes into contact with blood on at least some of the parts that come into contact with blood, such as the outer surface of the balloon 1 and the outer surface of the body shaft 2. In addition, the site | part to which hydrophilic coating is applied, and the length to apply can be determined according to the intended purpose of the balloon catheter. The kind of hydrophilic coating does not limit the effect of the present invention, and hydrophilic polymers such as poly (2-hydroxyethyl methacrylate), polyacrylamide, and polyvinylpyrrolidone can be suitably used, and the coating method is not limited.

  Specific examples according to the present invention are described in detail below, but the present invention is not limited to the following examples.

Example 1
Polyvinyl alcohol (PVA) having an average polymerization degree of 2000 and a saponification degree of 98% was used as a swellable resin, and a 20% by weight aqueous solution of PVA was sealed in a cylindrical mold having an inner diameter of 4 mm, and then frozen at −25 ° C. The treatment and the thawing treatment at 0 ° C. were repeated 5 times. The PVA was taken out of the mold, stretched to a length of 3 times in the longitudinal direction, and dried to prepare a cylindrical PVA. This cylindrical PVA is swollen with water, drilled using two cores having an outer diameter of 0.40 mm, and dried again, thereby forming a PVA molded body having two 0.40 mm holes (outer diameter About 0.90 mm).

  This PVA molded body was bonded to the distal end side of the inflation lumen of a main body shaft (outer diameter 1.20 mm, inner diameter 1.00 mm) made of polyamide elastomer. Further, a balloon balloon as shown in FIG. 1 was produced by welding a polyurethane balloon to the distal end side of the main body shaft and bonding a polycarbonate hub to the proximal end portion.

(Example 2)
Polyvinyl alcohol (PVA) having an average polymerization degree of 2000 and a saponification degree of 98% was used as a swellable resin, and a 20% by weight aqueous solution of PVA was sealed in a cylindrical mold having an inner diameter of 3 mm, and then frozen at −25 ° C. The treatment and the thawing treatment at 0 ° C. were repeated 5 times. The PVA was taken out of the mold, stretched to a length of 3 times in the longitudinal direction, and dried to prepare a cylindrical PVA. This cylindrical PVA is swollen with water, drilled using two core materials having an outer diameter of 0.40 mm and an outer diameter of 0.15 mm, and dried again. A PVA molded body (outer diameter of about 0.65 mm) having a 15 mm hole was produced.

  An inner shaft (outer diameter 0.38 mm, inner diameter 0.30 mm) made of polyamide elastomer was placed through a 0.40 mm hole without removing the 0.15 mm core material of the PVA molded body. The base end of a polyamide elastomer balloon was welded to the tip of a polyamide elastomer main shaft (outer diameter 0.71 mm, inner diameter 0.55 mm), and the inner shaft was further placed inside the main shaft. The PVA-formed body was embedded in the balloon resin by welding the portion of the balloon where the PVA molded body of the inner shaft was disposed. Thereafter, the 0.15 mm core material was removed, and a polycarbonate hub was bonded to the base shaft base end portion to produce a balloon catheter as shown in FIG.

(Example 3)
Polyvinyl alcohol (PVA) having an average polymerization degree of 2000 and a saponification degree of 98% was used as a swellable resin, and a 20% by weight aqueous solution of PVA was sealed in a cylindrical mold having an inner diameter of 2.5 mm, and then −25 ° C. The freezing treatment and the thawing treatment at 0 ° C. were repeated 5 times. The PVA was taken out of the mold, stretched to a length of 3 times in the longitudinal direction, and dried to prepare a cylindrical PVA. This cylindrical PVA is swollen with water, drilled using a core material having an outer diameter of 0.30 mm, and dried again, whereby a PVA molded body having an outer diameter of 0.30 mm (outer diameter of about 0.45 mm) ) Was produced.

  A polyamide elastomer main body shaft (outer diameter 1.25 mm) equipped with an inflation lumen (diameter 0.48 mm) and a guide wire lumen (diameter 0.50 mm) is prepared, and a polyamide elastomer balloon is welded to the tip side, A polycarbonate hub was bonded to the base end. By placing the PVA molded body without the 0.30 mm core material on the tip side of the inflation lumen, passing the core material for lumen maintenance into the guide wire lumen, and welding the tip of the body shaft, The PVA molded body was embedded in the shaft resin with the structure as shown in FIG. Thereafter, the core material of 0.30 mm and the core material for maintaining the guide wire lumen were removed.

  A balloon catheter system as shown in FIG. 3 was prepared by preparing a 3 ml syringe equipped with a 30 G injection needle as a liquid injector and placing it through a 0.30 mm hole in the PVA molded body.

(Evaluation)
Using the balloon catheter of the above example, the performance of removing bubbles remaining in the balloon and the sealing performance of the swellable resin were evaluated. With respect to the balloon catheters of Examples 1 and 2, when a physiological saline solution containing 50% of contrast medium was injected from the proximal end hub into the inflation lumen, all the air in the shaft was removed, and bubbles remaining in the balloon were observed. Was not. The ratio of the cross-sectional area of the hole to the cross-sectional area of the swellable resin of the balloon catheter of Example 1 was about 32%, and the time until the hole was sealed and no liquid leaked was about 20 minutes. The ratio of the cross-sectional area of the hole to the cross-sectional area of the swellable resin of the balloon catheter of Example 2 was about 9%, and the time until the hole was sealed and no liquid leaked was about 5 minutes. With respect to the balloon catheter of Example 3, when a physiological saline containing 50% of contrast medium was injected into the inflation lumen from the liquid injector placed at the tip, all the air in the shaft was removed, and bubbles remaining in the balloon were observed. Was not. The ratio of the cross-sectional area of the hole to the cross-sectional area of the swellable resin of the balloon catheter of Example 3 is about 44%, and the time from when the liquid injector is removed until the hole is sealed and no liquid leaks is about 30 minutes. Met. In any of the examples, it was confirmed that the effect of the present invention was exhibited, and it functioned as a balloon catheter capable of easily removing bubbles remaining in the balloon.

1. Balloon 2. Body shaft Inflation lumen 4. 4. Swellable resin that swells by contact with liquid 5. Hole for communication between the inflation lumen and the outside of the catheter Inner shaft 7. Guidewire lumen 7a. Opening on the distal end side of the guide wire lumen 7b. 7. Opening of the proximal end of the guide wire lumen 8. Lumen for work Hub

Claims (9)

At least an expandable and contractible balloon disposed on the outer periphery of the catheter distal end, a hub disposed at the proximal end of the catheter, and a main body shaft having an inflation lumen for allowing fluid to communicate from the hub to the inside of the balloon. A balloon catheter provided with a swellable resin that swells when contacted with a liquid is provided on a distal end side of the inflation lumen, and the swellable resin is provided with a hole through which the inflation lumen communicates with the outside of the catheter. A balloon catheter characterized by comprising: 2. The balloon catheter according to claim 1, wherein the swellable resin is embedded in the balloon resin and arranged on the distal end side of the inflation lumen. The balloon catheter according to claim 1, wherein the swellable resin is disposed in a distal end side of an inflation lumen in a structure in which the swellable resin is embedded in a shaft resin. The balloon catheter according to any one of claims 1 to 3, wherein an inner shaft having a guide wire lumen is provided inside the main body shaft. The balloon catheter according to any one of claims 1 to 3, wherein the main body shaft is constituted by a tube having a guide wire lumen parallel to the inflation lumen. The balloon catheter according to any one of claims 4 to 5, wherein the balloon catheter is an OTW type. The balloon catheter according to any one of claims 4 to 5, wherein the balloon catheter is an RX type. The balloon catheter according to any one of claims 1 to 7, wherein the balloon catheter further includes another working lumen. A balloon catheter system comprising: the balloon catheter according to claim 1; and a liquid injector disposed so as to pass through a hole provided in the swellable resin.

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