JP2015192808A - balloon catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balloon catheter capable of expanding/contracting a balloon part with excellent response, in which an inner tube and an outer tube are communicated at near the tip of the outer tube with a simple means and the tip of the outer tube has a large opening area.SOLUTION: There is provided a balloon catheter comprising: a balloon part 22 capable of being expanded and contracted; an outer tube 24 whose tip end part is communicated to a rear end part of the balloon part 22 so that an inner section of the balloon part 22 is charged and discharged with pressurized fluid; and an inner tube 30 which is communicated with a tip end part of the balloon part 22, extending in axis direction at inner sections of the balloon part 22 and the outer tube 24. At a position near a tip end part of the outer tube 24 to which the rear end part of the balloon part 22 is jointed, reinforcement material 24c enclosed in tube wall of the outer tube 24 projects to outside of the tube wall to construct an inner tube holding part 50. The inner tube 30 and the outer tube 24 are communicated in a manner where the inner tube holding part 50 holds a predetermined part of the inner tube 30.

Description

 The present invention relates to a balloon catheter, and more particularly to a balloon catheter that is suitably used for intra-aortic balloon pumping.

  In recent years, balloon catheters are frequently used for various treatments and examinations in the medical field. For example, an intra-aortic balloon pumping method (IABP method) is performed as a treatment for lowering cardiac function, in which a balloon catheter is inserted into the aorta and the balloon is inflated and deflated according to the heart beat to assist the cardiac function. It has been broken.

  As an intra-aortic balloon catheter used in this IABP method, a catheter having a so-called double tube structure formed by an outer tube and an inner tube located inside the outer tube is generally used (for example, (See Patent Document 1 and Patent Document 2).

  In the intra-aortic balloon catheter described in Patent Documents 1 and 2, the inner tube and the outer tube are connected for the purpose of preventing a phenomenon that the catheter becomes difficult to insert into the body due to the relative movement of the inner tube and the outer tube. It is fixed near the tip of the outer tube.

  However, in the method of bonding the outer tube and the inner tube with an adhesive only in the vicinity of the distal end of the outer tube as in the balloon catheter of Patent Document 1, it is difficult to secure a sufficient bonding area, and sufficient bonding strength is obtained. I can't get it. For this reason, the bonded portion may be peeled off during insertion of the balloon catheter.

  Further, in the technique in which the inner tube and the outer tube are fixed by inserting an intermediate member for fixing inside the outer tube, as in the balloon catheter of Patent Document 2, the intermediate member exists, and therefore the outer tube The tip opening surface of the is narrowed. For this reason, the flow path resistance of the fluid for inflating and deflating the balloon increases at the insertion portion of the intermediate member, and the time required to inflate and deflate the balloon may become long (responsiveness may deteriorate). It was. If the responsiveness of the balloon is deteriorated, it becomes difficult to inflate and deflate the balloon in accordance with the pulsation of the heart, and the effect of assisting cardiac function is reduced.

JP 2000-5318 A JP 2003-701

  The present invention is made in view of such a situation, the purpose is to connect the inner tube and the outer tube in the vicinity of the distal end of the outer tube by a simple means, and the opening area at the distal end of the outer tube is large, It is an object of the present invention to provide a balloon catheter that can inflate and deflate the balloon part with good responsiveness.

In order to achieve the above object, a balloon catheter according to the present invention comprises:
A balloon portion that can be inflated and deflated, and
An outer tube having a tip connected to a rear end of the balloon so as to introduce and lead a pressure fluid into and out of the balloon;
A balloon catheter having a distal end portion of the balloon portion connected and an inner tube extending in the axial direction inside the balloon portion and the outer tube,
In the vicinity of the distal end portion of the outer tube to which the rear end portion of the balloon portion is joined, the reinforcing material included in the tube wall of the outer tube protrudes to the outside of the tube wall,
The reinforcing material protruding to the outside of the tube wall constitutes an inner tube holding portion for holding a predetermined portion of the inner tube;
The inner tube and the outer tube are connected by the inner tube holding unit holding a predetermined portion of the inner tube.

  According to the present invention, the inner tube and the outer tube are connected in the vicinity of the distal end of the outer tube by a simple means, the opening area at the distal end of the outer tube is large, and the balloon portion is inflated and contracted with good responsiveness. A balloon catheter is provided. In particular, in the present invention, since the inner pipe holding portion is formed using the reinforcing material included in the outer pipe, there is no need to separately prepare a member for holding the inner pipe. Moreover, the strength of the outer tube is improved by embedding the reinforcing material inside the tube wall of the outer tube. In the present invention, the vicinity of the tip means the tip or the vicinity thereof, and may be inside the balloon part.

  Preferably, an outer diameter or a width larger than an outer diameter of a predetermined portion of the inner tube held by the inner tube holding portion is provided on an outer peripheral portion of the inner tube positioned on the tip side of the inner tube holding portion. A stopper portion is formed. By forming such a stopper portion, even if the inner tube is pushed back by blood flow or the like, the stopper portion is locked to the inner tube holding portion and effectively prevents the balloon portion from being crushed in the axial direction. be able to. For this reason, there is less possibility that the shape of the balloon portion will collapse, and the phenomenon that the assist function of the cardiac function by the balloon portion deteriorates is prevented.

  Preferably, the outer diameter or width of the inner tube on the distal end side from the stopper portion is continuously larger than the outer diameter of the predetermined portion of the inner tube along the longitudinal direction. By comprising in this way, the mechanical strength of the inner pipe of the front end side from a stopper part increases. For this reason, even if the inner tube is pushed back by blood flow or the like, the stopper portion is locked to the inner tube holding portion, and the balloon portion can be effectively prevented from being crushed in the axial direction.

  The inner tube holding portion may be disposed inside the distal end portion of the outer tube to which the rear end portion of the balloon portion is joined. In this case, since the reinforcing material is taken out at the distal end portion of the outer tube where the reinforcing material constituting the inner tube holding portion is taken inside the distal end portion of the outer tube, the thickness of the tube wall is reduced. . Since the rear end portion of the balloon portion is connected to the distal end portion of the outer tube having a thin tube wall, the outer diameter of the connection portion can be reduced and the inner diameter of the connection portion can be increased. And the channel cross-sectional area can be increased. That is, by increasing the inner channel cross-sectional area of the outer tube excluding the inner tube holding portion without increasing the outer diameter of the outer tube, the responsiveness of the fluid flowing through the channel cross section is improved.

  The inner tube holding portion may be arranged so as to protrude in the axial direction from the distal end portion of the outer tube to which the rear end portion of the balloon portion is joined toward the inside of the balloon portion. Because the exposed reinforcing material that forms the inner tube holding part protrudes from the tip of the outer tube in the axial direction, the exposed reinforcing material can be easily irradiated with lasers, and the inner tube is held with a through hole through which the inner tube passes. The part can be easily formed by laser welding or the like.

  Preferably, the reinforcing member protruding to the outside of the tube wall is wound around a predetermined portion of the inner tube to constitute the inner tube holding portion. For example, a reinforcing material embedded in a coil shape on the tube wall of the outer tube is easily deformed to a winding diameter smaller than the inner diameter of the outer tube by jumping out from the tube wall, and is easily wound around a predetermined portion of the inner tube. . Moreover, the inner tube can be held near the inner peripheral surface of the outer tube simply by wrapping the reinforcing material around a predetermined portion of the inner tube, so that the inner tube holding portion is not increased without increasing the outer diameter of the outer tube. The cross-sectional area of the internal flow path of the outer tube excluding can be increased.

  Preferably, the inner tube holding portion holds a predetermined portion of the inner tube so that the inner tube is brought closer to the inner peripheral surface of the outer tube. With such a configuration, the inner tube can be held near the inner peripheral surface of the outer tube, the flow resistance in the outer tube can be reduced, and the inner channel cross section of the outer tube is circulated. Fluid responsiveness is improved.

  The balloon catheter of the present invention is preferably used for intra-aortic balloon pumping (IABP).

FIG. 1 is a schematic cross-sectional view of a balloon catheter according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part of the balloon catheter shown in FIG. FIG. 3 is a cross-sectional view of an essential part taken along line III-III shown in FIG. 4A is a detailed cross-sectional view of the outer tube shown in FIG. FIG. 4B is a cross-sectional view before the outer tube shown in FIG. 4A is manufactured. FIG. 5 is an enlarged cross-sectional view of a main part of a balloon catheter according to another embodiment of the present invention. FIG. 6 is an enlarged cross-sectional view of a main part of a balloon catheter according to still another embodiment of the present invention. FIG. 7 is a perspective view of the outer tube showing the vicinity of the tip of the outer tube shown in FIG.

Balloon catheter 20 according to an embodiment of the present invention shown in the first embodiment Figure 1 is a balloon catheter for use in the intra-aortic balloon pumping method, having a balloon portion 22 to expand and contract in accordance with the beating of the heart. The balloon part 22 is comprised with the thin film about 50-150 micrometers in film thickness. The material of the thin film is not particularly limited, but is preferably a material excellent in bending fatigue resistance, and is made of, for example, polyurethane. The outer diameter and length of the balloon portion 22 are determined according to the inner volume of the balloon portion 22 that greatly influences the assisting effect on the cardiac function, the inner diameter of the arterial blood vessel, and the like. The inner volume of the balloon part 22 is not particularly limited, but is 20 to 50 cc. The outer diameter of the balloon part 22 is preferably 12 to 16 mm at the time of inflation, and the length is preferably 150 to 250 mm.

  A tip portion 25 having a blood circulation hole 23 is attached to the tip portion 22a of the balloon portion 22 by means such as heat fusion or adhesion. On the inner peripheral side of the tip portion 25, the tip portion of the inner tube 30 is attached by means such as heat fusion or adhesion.

  A distal end portion of the outer tube 24 is connected to the rear end portion 22 b of the balloon portion 22. The pressure fluid is introduced and led out into the balloon portion 22 through the pressure fluid passage 29 formed in the outer tube 24, and the balloon portion 22 is inflated and deflated. The connection between the balloon portion 22 and the outer tube 24 is performed by heat fusion or bonding with an adhesive.

  The inner tube 30 extends in the axial direction inside the balloon portion 22 and the outer tube 24, and does not communicate with the pressure fluid communication path 29 formed inside the balloon portion 22 and inside the outer tube 24. A blood conduction path 31 is formed and communicates with a blood pressure measurement port 32 of a branching section 26 described later at the rear end. As will be described later, the inner tube 30 sends the blood pressure taken in the blood circulation hole 23 of the tip portion 25 to the blood pressure measuring port 32 of the branching portion 26 and measures the blood pressure fluctuation therefrom.

  When the balloon catheter 20 is inserted into the artery, the inner tube 30 positioned in the balloon portion 22 is wound around the balloon portion 22 in a deflated state, and the blood conduction path 31 conveniently connects the balloon portion 22 in the artery. It is also used as a lumen through which a guide wire used for insertion into a tube is inserted.

  A branch portion 26 is connected to the rear end portion of the outer tube 24. The branch portion 26 is formed separately from the outer tube 24 and is connected to the outer tube 24 by means such as heat fusion or adhesion. The branch portion 26 includes a first fluid passage 47 in which a pressure fluid communication path 29 in the outer tube 24 and a pressure fluid inlet / outlet port 28 for introducing and deriving pressure fluid into and from the balloon portion 22 are formed. A second passage 45 in which a blood pressure measurement port 32 communicating with the blood conduction path 31 is formed is formed.

  The pressure fluid inlet / outlet port 28 is connected to a pump device (not shown), and the pressure fluid is introduced into and led out from the balloon portion 22 by this pump device. Although it does not specifically limit as a pressure fluid, Helium gas with small viscosity and mass etc. are used so that the balloon part 22 expand | swells and shrinks rapidly according to the drive of a pump apparatus.

  The blood pressure measurement port 32 is connected to a blood pressure measurement device (not shown), and can measure a change in the blood pressure in the artery taken from the blood circulation hole 23 near the tip of the balloon portion 22. Based on the blood pressure fluctuation measured by this blood pressure measuring device, the pump device is controlled in accordance with the heart beat, and the balloon portion 22 is inflated and deflated in a short cycle of 0.4 to 1 second.

  The outer tube 24 is not particularly limited, but is made of a synthetic resin such as polyurethane, polyvinyl chloride, polyethylene terephthalate, or polyamide, and a reinforcing material is embedded therein. In the present embodiment, as shown in FIGS. 2 and 4A, the outer tube 24 has an inner layer 24a and an outer layer 24b, and a reinforcing material 24c is embedded between the inner layer 24a and the outer layer 24b.

  Although it does not specifically limit as the reinforcing material 24c, For example, it is comprised with metals, such as stainless steel and a nickel titanium alloy, is knitted in the shape of a fiber, is arrange | positioned in the shape of a nonwoven fabric, or is embedded in the shape of a coil. Also good. By using a tube having such a reinforcing member 24c as the outer tube 24, even if the outer tube 24 is made thinner, kinks or the like of the outer tube 24 can be effectively prevented.

  In the present embodiment, a coil tube 24A having a reinforcing member 24c embedded in a coil shape shown in FIG. 4B is prepared, and as shown in FIG. 4A, the reinforcing member included in the tube wall only at the tip 24d. 24c is protruded inside the outer tube 24 outside the tube wall. Only the inner layer 24a may be removed from the distal end portion 24d in order to allow the reinforcing member 24c to jump out of the tube wall and inside the outer tube 24. Then, the exposed reinforcing member 24c1 protruding to the inside of the outer tube 24 outside the tube wall is wound in a coil shape with a winding diameter close to the outer diameter D2 of the inner tube 30 shown in FIG. 50 is formed.

  At the distal end portion 24d of the outer tube 24, the reinforcing member 24c protrudes from the tube wall, and the inner layer 24a is removed. Therefore, the outer diameter of the distal end portion 24d can be made smaller than the other portions. Or in the front-end | tip part 24d of the outer tube | pipe 24, the internal diameter can be made larger than another part. A contrast ring or the like may be embedded near the distal end portion 24d of the outer tube 24.

  As shown in FIG. 2, a rear end portion 22b of the balloon portion 22 is joined to the front end portion 24d of the outer tube 24 by means such as heat fusion or adhesion. In the present embodiment, the inner tube holding portion 50 is disposed on a part of the inner peripheral surface of the distal end portion 24d of the outer tube 24 to which the rear end portion 22b of the balloon portion 22 is joined.

  As shown in FIG. 3, the inner tube holding portion 50 is disposed close to a part of the inner peripheral surface of the distal end portion 24 d of the outer tube 24 so as not to block the pressure fluid conduction path 29. The inner tube holding portion 50 made of a plate-shaped piece wound in a coil shape is wound around a predetermined portion of the inner tube 30, and the inner tube 30 is placed on the inner peripheral surface of the outer tube 24 at the distal end portion 24 d of the outer tube 24. Fix close to part. The predetermined portion of the inner tube 30 is an outer peripheral portion of the inner tube 30 located near the distal end portion 24d of the outer tube 24. The inner tube holding portion 50 is preferably wound around the outer periphery of the predetermined portion of the inner tube 30 in one or more rounds, and more preferably in one to three rounds.

  As shown in FIG. 2, the axial length L2 of the inner tube holding portion 50 is preferably equal to or less than the length L1 of the joint portion between the rear end portion 22b of the balloon portion 22 and the distal end portion 24d of the outer tube 24. It may be larger than the length L1. The axial length L2 of the inner tube holding part 50 is preferably 0.01 to 30 mm. The thickness of the inner tube holding portion 50 corresponds to the thickness of the reinforcing member 24c, and is preferably 0.05 to 10 mm.

  The outer diameter D2 of the inner tube 30 is not particularly limited, but is preferably 0.5 to 2 mm, and preferably 30 to 60% of the inner diameter D1 of the outer tube 24. In this embodiment, the outer diameter D2 of the inner tube 30 is substantially the same along the axial direction. The inner tube 30 is made of, for example, a synthetic resin tube such as polyurethane, polyvinyl chloride, polyethylene, polyamide, polyetheretherketone, a nickel titanium alloy thin tube, a stainless steel thin tube, or the like. Further, when the inner tube 30 is composed of a synthetic resin tube, a stainless steel wire or the like may be embedded.

  The inner layer 24a of the outer tube 24 is not particularly limited, but is preferably formed of a polyamide resin, a polyurethane resin, or the like. The outer layer 24b is preferably composed of a polyamide resin, a polyurethane resin, or the like. Since the outer layer 24b is a portion that comes into contact with the inner wall of the blood vessel, the outer layer 24b is preferably made of a material having excellent flexibility that does not damage the blood vessel.

  In this embodiment, the inner tube holding part 50 is wound around a predetermined part of the inner tube 30 and the inner tube 30 and the outer tube 24 are connected, but the inner tube holding part 50 is wound around the inner tube 30. At the same time, the inner tube holding part 50 and the inner tube 30 may be bonded together. Further, the adjacent portions of the winding turn of the exposed reinforcing material 24c1 protruding in a coil shape may be joined by laser welding or the like.

  According to the present embodiment, the inner tube 30 and the outer tube 24 can be connected at the distal end portion 24d of the outer tube 24 by simple means. Moreover, in the present embodiment, the opening area of the pressure fluid conduction path 29 is large at the distal end portion 24 d of the outer tube 24. Therefore, the balloon part 22 can be inflated and deflated with good responsiveness.

  Furthermore, in this embodiment, since the reinforcing material 24c is embedded inside the tube wall of the outer tube 24, the strength of the outer tube 24 is improved, and kinks and the like can be effectively prevented. In particular, in the present embodiment, since the inner tube holding portion 50 is formed using the reinforcing material 24c included in the outer tube 24, it is not necessary to separately prepare a member for holding the inner tube 30.

  In addition, at the distal end portion 24d of the outer tube 24 where the inner tube holding unit 50 is located, the reinforcing material 24c protrudes from the tube wall. Therefore, the thickness of the distal end portion 24d of the outer tube 24 can be reduced. Therefore, even if the rear end portion 22b of the balloon portion 22 is connected to the front end portion 24d of the outer tube 24 and the inner tube holding portion 50 is disposed inside the outer tube 24, the outer diameter of the outer tube 24 is not increased. The inner channel cross-sectional area of the outer tube 24 excluding the inner tube 30 (the cross-sectional area of the pressure fluid communication path 29) can be increased. By increasing the inner channel cross-sectional area, the response of the fluid flowing through the channel cross-section is improved.

  Further, in the present embodiment, the reinforcing material 24 c protruding to the outside of the tube wall is wound around a predetermined portion of the inner tube 30 to constitute the inner tube holding unit 50. For example, the reinforcing member 24c embedded in the tube wall of the outer tube 24 is easily deformed to a winding diameter smaller than the inner diameter of the outer tube 24 by jumping out from the tube wall. Easy to wrap around. Further, the inner tube 30 can be held near the inner peripheral surface of the outer tube 24 only by winding the reinforcing member 24c around a predetermined portion of the inner tube 30, so that the outer diameter of the outer tube 24 is not increased. The cross-sectional area of the inner channel of the outer tube 24 can be increased.

  Furthermore, since the inner tube holding portion 50 holds a predetermined portion of the inner tube 30 so that the inner tube 30 approaches the inner peripheral surface of the outer tube 24, the inner tube 30 is close to the inner peripheral surface of the outer tube 24. Can be held in. Therefore, the flow resistance within the outer tube 24 can be reduced, and the responsiveness of the fluid flowing through the inner flow channel cross section of the outer tube 24 is improved.

  In order to manufacture the balloon catheter 20 of the present embodiment, the inner tube holding portion 50 made of the exposed reinforcing material 24c1 is formed inside the distal end portion 24d of the outer tube 24 by the above-described method shown in FIGS. 4A and 4B. . Thereafter, the inner tube 30 is disposed inside the balloon portion 22 and the outer tube, and a predetermined portion of the inner tube 30 is held by the inner tube holding unit 50. Next, the distal end portion 22 a of the balloon portion 22 is joined to the distal end portion of the inner tube 30 by adhesion or the like, and the rear end portion 22 b of the balloon portion 22 is joined to the distal end portion 24 d of the outer tube 24 by fusion or the like. Further, the branch portion 26 is connected to the rear end portion of the outer tube 24 by adhesion or the like.

Second Embodiment A balloon catheter according to the present embodiment is manufactured in the same manner as the first embodiment except for the following, and exhibits the same effects. Hereinafter, the overlapping description is omitted.

  As shown in FIG. 5, in the present embodiment, an outer peripheral portion of the inner tube 30 positioned on the distal end side with respect to the inner tube holding portion 50 is outside a predetermined portion of the inner tube 30 held by the inner tube holding portion 50. A stopper portion 30a having an outer diameter D3 or width larger than the diameter D2 is formed. Moreover, in the present embodiment, the outer diameter D3 or the width of the inner tube 30b on the distal end side from the stopper portion 30a is continuously larger than the outer diameter D2 along the longitudinal direction. D3 / D2 is preferably 1.05 to 1.2.

  By forming such a stopper portion 30a, even if the balloon portion 22 and the inner tube 30 are pushed back to the rear end side by blood flow or the like, the stopper portion 30a is locked to the inner tube holding portion 50, and the balloon portion It is possible to effectively prevent the 22 from being crushed in the axial direction. Therefore, there is less possibility that the shape of the balloon part 22 is lost, and a phenomenon in which the assist function of the cardiac function by the balloon part 22 is deteriorated is prevented.

  Furthermore, in the present embodiment, the outer diameter or width of the inner tube 30b on the distal end side from the stopper portion 30a is larger than the inner diameter of the cavity formed continuously in the inner tube holding portion 50 along the longitudinal direction. The mechanical strength of the inner tube 30b on the distal end side increases from 30a. For this reason, even if the inner tube 30 is about to be pushed back by blood flow or the like, the stopper portion 30a is locked to the inner tube holding portion 50, and the balloon portion 22 can be effectively prevented from being crushed in the axial direction.

  In the present embodiment, the outer shape of the cross section of the inner tube 30b on the distal end side is not necessarily circular but may be flat. That is, the stopper portion 30a may be formed intermittently without being formed uniformly along the circumferential direction of the inner tube 30. The stopper portion 30a may be a protrusion formed on the outer periphery of the inner tube 30 or a step.

  In addition, the inner tube 30b on the distal end side preferably has the same cross-sectional shape along the axial direction from the viewpoint of ease of manufacturing, but does not necessarily have the same shape. If the stopper portion 30a is formed, the outer diameter D3 of the inner tube 30b on the front end side may be the same as or smaller than the outer diameter D2 of the inner tube 30 on the rear end side.

Third Embodiment The balloon catheter of the present embodiment is manufactured in the same manner as in the first embodiment except for the following, and exhibits the same effects. Hereinafter, the overlapping description is omitted.

  As shown in FIG. 6, in this embodiment, the exposure reinforcement is performed so as to protrude in the axial direction from the distal end portion 24 d 1 of the outer tube 24 to which the rear end portion 22 b of the balloon portion 22 is joined toward the inside of the balloon portion 22. An inner tube holding portion 50a made of the material 24c1 may be disposed.

  As shown in FIG. 7, since the exposed reinforcing member 24c1 constituting the inner tube holding portion 50a protrudes in the axial direction from the distal end portion 24d1 of the outer tube 24, the adjacent portions of the winding turn in the exposed reinforcing member 24c1 Are joined by laser welding or the like to form the joint 52. That is, the inner tube holding portion 50a having the through hole 54 through which the inner tube 30 passes can be easily formed by laser welding or the like. The inner diameter of the through hole 54 is equal to or greater than the outer diameter of the inner tube 30.

Other Embodiments The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

  For example, the balloon catheter of the present invention is used as an intra-aortic balloon catheter that requires the inner tube 30 to be connected to the outer tube 24 in the vicinity of the distal end portion of the outer tube 24 to which the rear end portion 22b of the balloon portion 22 is joined. However, the present invention is not limited to this. For example, the balloon catheter of the present invention can be used as a PTCA catheter, a PTA catheter, or the like.

  In the present invention, as shown in FIG. 1, the outer tube 24 and the inner tube 30 extend from the tip of the outer tube 24 to a length L0 of 50% or more, preferably 70% or more of the total length of the outer tube 24. It may be fixed by an adhesive 35. By fixing the outer tube 24 and the inner tube 30 in this manner, the flow resistance of the pressure fluid conduction path 29 in the outer tube 24 is further reduced, and the responsiveness of the balloon portion 22 is improved. The adhesive used for fixing is not particularly limited, and adhesives such as cyanoacrylate adhesives and epoxy adhesives can be used, and it is particularly preferable to use cyanoacrylate adhesives.

20 ... Balloon catheter 22 ... Balloon part 24 ... Outer tube 24a ... Inner layer 24b ... Outer layer 24c ... Reinforcement material 24c1 ... Exposed reinforcement material 29 ... Pressure fluid conduction path 30 ... Inner tube 30a ... Stopper part 31 ... Blood conduction paths 50, 50a ... Inner tube holding part 52 ... joining part 54 ... through hole

Claims (8)

A balloon portion that can be inflated and deflated, and
An outer tube having a tip connected to a rear end of the balloon so as to introduce and lead a pressure fluid into and out of the balloon;
A balloon catheter having a distal end portion of the balloon portion connected and an inner tube extending in the axial direction inside the balloon portion and the outer tube,
In the vicinity of the distal end portion of the outer tube to which the rear end portion of the balloon portion is joined, the reinforcing material included in the tube wall of the outer tube protrudes to the outside of the tube wall,
The reinforcing material protruding to the outside of the tube wall constitutes an inner tube holding portion for holding a predetermined portion of the inner tube;
The balloon catheter, wherein the inner tube and the outer tube are connected by the inner tube holding unit holding a predetermined portion of the inner tube.   A stopper portion having an outer diameter or width larger than the outer diameter of the predetermined portion of the inner tube held by the inner tube holding portion is provided on the outer peripheral portion of the inner tube positioned on the distal end side of the inner tube holding portion. The balloon catheter according to claim 1, wherein   The balloon catheter according to claim 2, wherein an outer diameter or a width of the inner tube on the distal end side from the stopper portion is continuously larger than an outer diameter of a predetermined portion of the inner tube along the longitudinal direction.   The balloon catheter according to any one of claims 1 to 3, wherein the inner tube holding portion is disposed inside a distal end portion of the outer tube to which a rear end portion of the balloon portion is joined.   The inner tube holding portion is arranged so as to protrude in the axial direction from the distal end portion of the outer tube to which the rear end portion of the balloon portion is joined toward the inside of the balloon portion. A balloon catheter according to claim 1.   The balloon catheter according to any one of claims 1 to 5, wherein the reinforcing member protruding to the outside of the tube wall is wound around a predetermined portion of the inner tube to constitute the inner tube holding portion.   The balloon catheter according to any one of claims 1 to 6, wherein the inner tube holding portion holds a predetermined portion of the inner tube so that the inner tube approaches the inner peripheral surface of the outer tube.   The balloon catheter according to any one of claims 1 to 6, which is used for an intra-aortic balloon pumping method.

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