JP6671867B2 - Balloon catheter - Google Patents

Description

  The present invention relates to balloon catheters.

  BACKGROUND ART A balloon catheter used for a treatment for expanding a stenotic part in a blood vessel is known. Patent Document 1 discloses a quick-change balloon catheter having a distal shaft, a hypotube, and a core wire. The distal shaft has flexibility. The distal shaft has a balloon at the distal end and a guidewire segment in the lumen. The hypotube has rigidity. The hypotube is connected to the proximal end of the distal shaft. The core wire is disposed between the distal shaft and the hypotube. The core wire mitigates sudden stiffness changes between the distal shaft and the hypotube.

JP 2003-164528 A

  In the case of the above balloon catheter, since the core wire is not fixed to the distal shaft, there is a possibility that the force when the hypotube is pushed into the blood vessel cannot be efficiently transmitted to the distal end of the distal shaft. is there. Therefore, when the balloon moves in the blood vessel, the distal shaft may be distorted due to the force acting on the balloon in the direction opposite to the moving direction. In this case, there is a problem that the balloon may not be able to be moved to a stenotic position in the blood vessel.

  An object of the present invention is to provide a quick-exchange balloon catheter that can move the balloon to a desired position.

The balloon catheter of the present invention includes a balloon, a first base end that is one end, and a first tip that is the other end, and the balloon is connected to the first tip. A first shaft, a tube extending from a peripheral wall hole formed in a peripheral wall of the first shaft through the lumen of the first shaft toward the first distal end, and a guide wire being inserted therethrough; A second base end that is a side end and a second end that is the other end, wherein the second front end extends from the first base end of the first shaft to the lumen. entry, and the second tip portion than the peripheral wall hole and a second shaft disposed in the first front end portion, the first distal portion of the inner surface of the first shaft, the second the second tip joined, the rigidity of the second shaft of the outer surface of the shaft, the first sheet Wherein the decreases as at the same location as the first base end portion of the shift toward the second tip.

  In the case of the above balloon catheter, the second shaft is joined to the inner surface of the first shaft closer to the first distal end than the peripheral wall hole. For this reason, the balloon catheter can appropriately transmit the force when the second shaft is pushed into the blood vessel to the portion on the first distal end side of the first shaft. For this reason, when the balloon moves in the blood vessel, even if a force in the direction opposite to the movement direction acts on the balloon, the force in the movement direction is applied to the portion of the first shaft on the first distal end side. The distortion of the first shaft can be suppressed. Therefore, the balloon catheter can appropriately move the balloon to a stenotic position in the blood vessel. Further, the balloon catheter can reduce a sudden change in rigidity in the stretching direction.

FIG. 2 is a side view of the balloon catheter 1. It is the top view which expanded the vicinity of the peripheral wall hole 41 of the balloon catheter 1. It is sectional drawing to which the vicinity of the peripheral wall hole 41 of the balloon catheter 1 was expanded. It is the side view which expanded the vicinity of the peripheral wall hole 41 of the balloon catheter 1A in the 1st modification. It is the side view which expanded the vicinity of the peripheral wall hole 41 of the balloon catheter 1B in the 2nd modification. It is a side view of balloon catheter 1C in the 3rd modification.

  An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the balloon catheter 1 is a so-called quick exchange type (RX (Rapid eXchange) type) catheter. The balloon catheter 1 has a first shaft 2, a second shaft 3, a tube 4, and a balloon 5. Note that the first shaft 2 may be called a distal shaft or the like. The second shaft 3 may be called a proximal shaft or the like. The lumen of tube 4 may be referred to as a lumen (for a guidewire) or the like. Hereinafter, each of them will be described in detail. In addition, each part of this invention is not limited to the part generally prescribed | regulated by the above-mentioned common name (distal shaft, proximal shaft, lumen). Hereinafter, the direction extending along the balloon catheter 1 is referred to as a “stretching direction”. Of both sides in the extending direction of the balloon catheter 1, the side on which the balloon 5 is provided is referred to as “distal side”, and the side opposite to the distal side is referred to as “proximal side”. The left side in FIG. 1 corresponds to the distal side, and the right side corresponds to the proximal side. In the direction perpendicular to the stretching direction, the side close to the center of the cross section of the balloon catheter 1 is called “inside”, and the side separated from the center of the cross section of the balloon catheter 1 is called “outside”.

<First shaft 2>
As shown in FIG. 1, the first shaft 2 is a tubular member. The first shaft 2 has flexibility. The first shaft 2 is formed of a polyamide resin. The first shaft 2 extends in the extending direction. The inner diameter of the first shaft 2 is substantially the same over the entire area in the stretching direction. The first shaft 2 has a space surrounded by an inner surface 21A that is an inner surface of the peripheral wall. Hereinafter, the space surrounded by the inner surface 21A is referred to as “lumen 211”. Of the two ends of the first shaft 2 in the extending direction, the open end on the proximal side is referred to as “first proximal end 2A”, and the open end on the distal side is referred to as “first distal end 2B”.

  In the above, the material of the first shaft 2 is not limited to a polyamide-based resin, but can be changed to another material having flexibility. For example, as the material of the first shaft 2, a synthetic resin material such as a polyethylene resin, a polypropylene resin, a polyurethane resin, and a polyimide resin may be used. An additive may be mixed with the synthetic resin material.

<Balloon 5>
The balloon 5 is provided at the first tip 2B of the first shaft 2. The balloon 5 has a space surrounded by an inner surface 51A that is an inner surface. Hereinafter, the space surrounded by the inner surface 51A is referred to as “lumen 511”. The proximal end of the balloon 5 is connected to the first distal end 2 </ b> B of the first shaft 2. The balloon 5 can be deformed into an inwardly deflated state and an outwardly inflated state. The balloon 5 expands when a compressed fluid is supplied from a hub described later, and contracts when no compressed fluid is supplied. FIG. 1 shows the balloon 5 in an inflated state. The balloon 5 is formed of a polyamide resin. Hereinafter, the proximal end of the balloon 5 is referred to as “balloon proximal end 5A”, and the distal end is referred to as “balloon distal end 5B”.

  In the above, the balloon 5 may be provided integrally with the first shaft 2 at the first distal end portion 2B of the first shaft 2. That is, the balloon may be formed as a part of the end on the distal end side of the first shaft 2. The material of the balloon 5 is not limited to a polyamide-based resin, and can be changed to another material having flexibility. For example, as the material of the balloon 5, a polyethylene resin, a polypropylene resin, a polyurethane resin, a polyimide resin, silicon rubber, natural rubber, or the like may be used.

<Tube 4>
As shown in FIGS. 1 and 2, the tube 4 is a tubular member. The tube 4 has flexibility. The material of the tube 4 is the same as the material of the first shaft 2. The tube 4 extends in the stretching direction. The inner diameter of the tube 4 is substantially the same over the entire region in the stretching direction. The outer diameter of the tube 4 is smaller than the inner diameter of the first shaft 2. The proximal end of the tube 4 communicates with the peripheral wall of the first shaft 2. A peripheral wall hole 41 is formed in a portion of the peripheral wall of the first shaft 2 where the proximal end of the tube 4 communicates. Hereinafter, the proximal end of the tube 4 is referred to as “tube proximal end 4A”. Note that the material of the tube 4 may be different from the material of the first shaft 2. Further, the tube 4 may include a plurality of layers.

  As shown in FIG. 1, the tube 4 extends from the peripheral wall hole 41 through the lumen 211 of the first shaft 2 toward the first distal end portion 2B of the first shaft 2. The tube 4 further extends from the first tip 2B toward the tip. The tube 4 extends through the lumen 511 of the balloon 5 toward the balloon tip 5B. The tube 4 further extends from the balloon distal end portion 5B toward the distal end side. The distal end of the tube 4 is located more distally than the balloon distal end 5B. Hereinafter, the distal end of the tube 4 is referred to as a “tube distal end 4B”. The balloon distal end 5B is connected to a portion of the outer surface 42B, which is the outer surface of the tube 4, slightly proximal to the tube distal end 4B.

  In the above, the tube 4 and the balloon 5 may be joined in another mode. For example, the tube tip 4B of the tube 4 may be inserted into the peripheral wall on the tip side of the balloon 5.

<Second shaft 3>
The second shaft 3 is a flexible tubular member. The material of the second shaft 3 is stainless steel. The rigidity of the second shaft 3 is larger than the rigidity of the first shaft 2. The second shaft 3 extends in the extending direction. The outer diameter of the second shaft 3 is slightly smaller than the inner diameter of the first shaft 2. As shown in FIG. 2, the inner diameter of the second shaft 3 is larger than the inner diameter of the tube 4. As shown in FIG. 1, the second shaft 3 has a space surrounded by an inner surface 31A which is an inner surface of the peripheral wall. Hereinafter, the space surrounded by the inner surface 31A is referred to as “lumen 311”. Of both ends in the extending direction of the second shaft 3, the open end on the proximal side is referred to as “second proximal end 3A”, and the open end on the distal side is referred to as “second open distal end 3B”. .

  A hub (not shown) is connected to the second base end 3A. The hub can supply a compressed fluid to the balloon 5 via the second shaft 3 and the first shaft 2.

  The second opening tip 3B is inclined with respect to another virtual plane (hereinafter, referred to as “first virtual plane S1”) perpendicular to the extending direction (hereinafter, “second virtual plane S2”). ").) The acute angle θ1 of the angle between the first virtual plane S1 and the second virtual plane S2 is preferably a value within the range of 85 degrees or more and less than 90 degrees. The second opening tip 3B has a shape obtained by cutting a cylindrical member along the second virtual plane S2. For this reason, the rigidity of the distal end portion (arrow D1 side) is smaller than the rigidity of the proximal end portion (arrow D2 side) of the most proximal portion 31 of the second opening distal end portion 3B. . Further, the rigidity of the portion of the second shaft 3 closer to the distal end side than the portion 31 decreases as the portion 31 approaches the portion 32. Hereinafter, the portion 32 closest to the distal end of the second opening distal end portion 3B is also referred to as “second distal end portion 32”.

  In the above, the material of the second shaft 3 is not limited to stainless steel, but can be changed to another material. For example, a metal material such as SUS may be used as the material of the second shaft 3.

  As shown in FIGS. 1 and 2, the second opening distal end portion 3B of the second shaft 3 enters the lumen 211 from the first proximal end portion 2A of the first shaft 2. The second opening distal end portion 3B is disposed over the entire region at the distal end side of the first proximal end portion 2A of the first shaft 2 and at the proximal end side of the first distal end portion 2B, that is, in the lumen 211. . The position P11 of the portion 31 closest to the proximal end of the second opening distal end 3B is the end of the peripheral wall hole 41 of the first shaft 2 on the first proximal end 2A side (hereinafter, referred to as “end 41A”). Is located closer to the first base end 2A than the position P12. The position P13 of the second distal end portion 32 of the second opening distal end portion 3B is a position P14 of an end portion (hereinafter, referred to as “end portion 41B”) of the peripheral wall hole 41 of the first shaft 2 on the first distal end portion 2B side. Are also disposed on the first tip 2B side.

<Joining the first shaft 2 and the second shaft 3>
As shown in FIG. 3, of the outer surface 31 </ b> B, which is the outer surface of the peripheral wall of the second shaft 3, a portion slightly proximal to the second distal end portion 32 is bonded to the inner surface 21 </ b> A of the first shaft 2 by an adhesive. 22. As described above, the position P13 of the second distal end portion 32 is disposed closer to the first distal end portion 2B (see FIG. 1) than the position P14 of the end portion 41B of the peripheral wall hole 41. The portion to which the adhesive 22 adheres, in other words, the portion slightly proximal to the second distal end portion 32 is also located closer to the first distal end portion 2B than the position P14. Therefore, the first shaft 2 and the second shaft 3 are joined by the adhesive 22 on the first tip 2B side from the position P14.

  A specific example of the joining method using the adhesive 22 is as follows. A small hole is provided in the first shaft 2 at a position corresponding to a portion where the vicinity of the second end portion 32 of the second shaft 3 is joined. The adhesive 22 is externally injected into the lumen 211 of the first shaft 2 through the provided hole. The injected adhesive 22 bonds the inner surface 21 </ b> A of the first shaft 2 to a portion of the second shaft 3 slightly closer to the proximal end than the second distal end 32.

  As shown in FIG. 1, the first base end 2 </ b> A of the first shaft 2 is connected to the outer surface 31 </ b> B of the second shaft 3. That is, the first shaft 2 and the second shaft 3 are joined at two places: the vicinity of the second distal end portion 32 of the second shaft 3 and the first base end portion 2A of the first shaft 2.

  The method of joining the inner surface 21A of the first shaft 2 and the vicinity of the second tip portion 32 of the second shaft 3 with the adhesive 22 is not limited to the above example, and may be joined by another method. . For example, a portion of the outer surface of the peripheral wall of the first shaft 2 where the vicinity of the second distal end portion 32 of the second shaft 3 is joined may be externally irradiated with laser light. A portion of the inner surface 21A of the first shaft 2 corresponding to the position irradiated with the laser beam may be melted. Then, the melted portion of the inner surface 21 </ b> A of the first shaft 2 may be welded to the vicinity of the second distal end portion 32 of the second shaft 3, thereby joining the two.

<Usage of balloon catheter 1>
The outline of the usage mode of the balloon catheter 1 is as follows. The tube 4 of the balloon catheter 1 is passed through the guide wire disposed in the blood vessel from the tube tip 4B. The second shaft 3 is pushed into the blood vessel. A force corresponding to the pushing of the second shaft 3 acts on the balloon 5 via the first shaft 2. The balloon 5 moves in the blood vessel along the guide wire, and is disposed at a narrow portion of the blood vessel. Compressed fluid is supplied to the lumen 311 from a hub (not shown) connected to the second base end 3A of the second shaft 3. Since the first base end 2A of the first shaft 2 is connected to the outer surface 31B of the second shaft 3, the compressed fluid does not flow out of the first shaft 2 and the second shaft 3.

  The supplied compressed fluid flows into the lumen 211 of the first shaft 2 from the second shaft 3 via the second opening tip 3B. The compressed fluid further flows into the lumen 511 of the balloon 5 from the first shaft 2 via the first tip 2B. The compressed fluid flowing into the balloon 5 expands the balloon 5. Thereby, the narrowed part of the blood vessel is expanded.

<Main actions and effects of the present embodiment>
As described above, in the balloon catheter 1, in the inner surface 21A of the first shaft 2, the second shaft 3 is joined to the first distal end portion 2B side of the peripheral wall hole 41. For this reason, the balloon catheter 1 applies the force when the second shaft 3 is pushed into the blood vessel in order to dispose the balloon 5 at the narrowed portion of the blood vessel along the guide wire, using the first distal end of the first shaft 2. It can be appropriately transmitted to the part on the part 2B side. For this reason, when the balloon 5 moves in the blood vessel, even if a force in the direction opposite to the movement direction acts on the balloon 5, the force in the movement direction acts on the portion of the first shaft 2 on the first distal end 2B side. By doing so, distortion of the first shaft 2 can be suppressed. Therefore, the balloon catheter 1 can appropriately move the balloon 5 to a stenotic position in a blood vessel.

  In the balloon catheter 1, the portion of the second shaft 3 slightly closer to the proximal end than the second distal end 32 is the end of the inner wall 21 </ b> A of the first shaft 2 on the first distal end 2 </ b> B side of the peripheral wall hole 41. It is joined to the first distal end portion 2B side from 41B by the adhesive 22. For this reason, the balloon catheter 1 can transmit the force when the second shaft 3 is pushed into the blood vessel to a position closer to the balloon 5 in the first shaft 2. Therefore, the balloon catheter 1 can further appropriately prevent the first shaft 2 from being distorted when the balloon 5 moves in the blood vessel. In the balloon catheter 1, a position near the second distal end portion 32 of the second shaft 3 is bonded to the inner surface 21 </ b> A of the first shaft 2 by the adhesive 22. In this case, the balloon catheter 1 can transmit the force when the second shaft 3 is pushed into the blood vessel to the first shaft 2 via a portion of the second shaft 3 closer to the balloon 5.

  In the balloon catheter 1, only a portion of the second shaft 3 on the first distal end portion 2 </ b> B side of the peripheral wall hole 41, which is slightly proximal to the second distal end portion 32, is bonded to the first shaft 3 by the adhesive 22. 2 and the inner surface 21A. In this case, since the joining region between the first shaft 2 and the second shaft 3 can be minimized, the balloon catheter 1 can be easily manufactured.

  Since the second shaft 3 has a higher rigidity than the first shaft 2, the change in the rigidity of the balloon catheter 1 in the extending direction becomes larger at the boundary between the first shaft 2 and the second shaft 3. Note that a portion where the change in rigidity is large is easily distorted when the second shaft 3 is pushed into the blood vessel. On the other hand, the stiffness of the second shaft 3 in the extending direction is closer to the second distal end portion 32 at the portion of the second opening distal end portion 3B closer to the second distal end portion 32 than to the most proximal portion 31 of the second opening distal end portion 3B. Become smaller. As a result, a sudden change in the rigidity of the balloon catheter 1 in the extending direction can be reduced. Therefore, when the balloon 5 moves in the blood vessel, when the balloon 5 moves in the blood vessel 1 and a force in the direction opposite to the moving direction acts on the balloon 5, the balloon catheter 1 can be prevented from being distorted at the portion where the rigidity changes in the stretching direction.

<Modification>
The present invention is not limited to the above embodiment, and various modifications are possible. In the above embodiment, a portion of the outer surface 31 </ b> B of the second shaft 3 slightly proximal to the second distal end portion 32 is joined to the inner surface 21 </ b> A of the first shaft 2 by the adhesive 22. On the other hand, of the outer surface 31 </ b> B of the second shaft 3, a portion including the second tip portion 32 may be joined to the inner surface 21 </ b> A of the first shaft 2 by the adhesive 22. In other words, the second tip 32 of the second shaft 3 may be joined to the inner surface 21A of the first shaft 2.

  The acute angle θ1 between the second virtual plane S2 where the second opening tip 3B of the second shaft 3 of the balloon catheter 1 is disposed and the first virtual plane S1 is limited to a range of 85 degrees or more and less than 90 degrees. However, other angles may be used. For example, the acute angle θ1 between the second virtual plane S2 and the first virtual plane S1 may be 0 degree. That is, the second opening tip 3B of the second shaft 3 may have a shape obtained by cutting a cylindrical member along the first virtual plane S1. Further, in the case of such a shape, at least one groove extending from the second opening distal end portion 3B of the second shaft 3 toward the base end side may be provided on the peripheral wall of the second shaft 3. Further, the width of the groove may gradually increase from the distal end side to the proximal end side. In this case, the rigidity of the second shaft 3 decreases toward the second distal end portion 32 as in the above-described embodiment.

  The balloon catheters 1A (see FIG. 4) and 1B (see FIG. 5) in the modified example will be described with reference to FIGS. The balloon catheters 1 </ b> A and 1 </ b> B differ from the balloon catheter 1 in the joining area between the inner surface 21 </ b> A of the first shaft 2 and the outer surface 31 </ b> B of the second shaft 3. As shown in FIG. 4, in the balloon catheter 1A according to the first modification, the first shaft 2 and the second shaft 3 are joined by an adhesive 22A. The area where the adhesive 22A adheres is longer on the proximal side than the area where the adhesive 22 adheres in FIG. In this case, the balloon catheter 1 </ b> A can bond the first shaft 2 and the second shaft 3 more firmly than the balloon catheter 1.

  In the balloon catheter 1A, the area to which the adhesive 22A is attached may be longer on the proximal side than in the case of FIG. For example, the adhesive 22A may be attached to the outer surface 31B of the second shaft 3 to a position closer to the base end than the position P14 of the end 41B of the peripheral wall hole 41. Further, for example, the adhesive 22A may be attached to the base surface of the outer surface 31B of the second shaft 3 from the position P12 of the end 41A of the peripheral wall hole 41. Further, for example, the adhesive 22A may adhere to the first base end 2A of the first shaft 2 on the outer surface 31B of the second shaft 3. That is, the first shaft 2 and the second shaft 3 may be joined to each other over the entire area overlapping in the extending direction.

  Further, in the balloon catheter 1A, the region where the adhesive 22A adheres may be longer on the distal end side than in the case of FIG. For example, the adhesive 22 </ b> A may adhere to the second end portion 32 of the outer surface 31 </ b> B of the second shaft 3.

  As shown in FIG. 5, in a balloon catheter 1B according to a second modification, the first shaft 2 and the second shaft 3 are joined with adhesives 22B and 22C. The region where the adhesive 22B adheres is closer to the tip than the region where the adhesive 22 adheres in FIG. Specifically, the area to which the adhesive 22B adheres is an area including the second front end 32. On the other hand, the adhesive 22C is attached to a region separated from the adhesive 22B by a predetermined distance toward the base end. In other words, the first shaft 2 and the second shaft 3 are joined at two places in a portion closer to the first base end 2A (see FIG. 1) than the peripheral wall hole 41. In this case, the balloon catheter 1B can more firmly join the first shaft 2 and the second shaft 3 than the balloon catheter 1 (see FIG. 1). Further, as compared with the balloon catheter 1A (see FIG. 4), the area to be bonded by the adhesive can be suppressed, so that the balloon catheter 1B can be easily manufactured.

  In the balloon catheter 1B, the area to which the adhesive 22C adheres may be closer to the base end than in the case of FIG. For example, the adhesive 22C may be attached to the outer surface 31B of the second shaft 3 on the base end side of the position P14 of the end 41B of the peripheral wall hole 41. Further, for example, the adhesive 22C may be attached to the outer surface 31B of the second shaft 3 on the base end side of the position P12 of the end 41A of the peripheral wall hole 41. In the balloon catheter 1B, the region where the adhesive 22B is attached may be closer to the base end than in the case of FIG. For example, the adhesive 22B may be at the same position as the region where the adhesive 22 is attached in FIG.

  In FIG. 5, the joint between the first shaft 2 and the second shaft 3 at the portion closer to the first distal end portion 2 </ b> B (see FIG. 1) than the peripheral wall hole 41 is not limited to two, but is three. It may be the above. Further, the first shaft 2 and the second shaft 3 may be joined only by the adhesive 22C. That is, the second shaft 3 may be joined to the first shaft 2 at a portion other than the second tip 32.

  With reference to FIG. 6, a balloon catheter 1C in a third modification will be described. The balloon catheter 1C differs from the balloon catheters 1, 1A, 1B in the shape of the second opening distal end portion 3B of the second shaft 3. As shown in FIG. 6, the position in the extending direction of the position P <b> 21 of the most proximal portion 31 of the second opening distal end 3 </ b> B is substantially the same as the first proximal end 2 </ b> A of the first shaft 2. The position P23 of the second distal end portion 32 of the second opening distal end portion 3B is located slightly proximal to the first distal end portion 2B of the first shaft 2. For this reason, when the virtual plane on which the second opening tip 3B is arranged is defined as the third virtual plane S3, the acute angle θ2 between the first virtual plane S1 and the third virtual plane S3 is The angle between the first virtual plane S1 and the second virtual plane S2 is larger than the acute angle θ1 (see FIG. 1). The rigidity of the second shaft 3 in the extending direction decreases as the position approaches the second distal end portion 32 from the portion 31. A portion of the outer surface 31B of the second shaft 3 slightly proximal to the second distal end portion 32 is similar to the balloon catheter 1 (see FIG. 1), 1A (see FIG. 4), and 1B (see FIG. 5). Is bonded to the inner surface 21A of the first shaft 2 by an adhesive. In the balloon catheter 1C, the region where the adhesive 22 adheres may be closer to the distal end than in the case of FIG. For example, a portion including the first tip 2B of the inner surface 21A of the first shaft 2 and a portion including the second tip 32 of the outer surface 31B of the second shaft 3 may be joined.

  In the balloon catheter 1C, the first shaft 2 and the second shaft 3 are joined at a position closer to the balloon 5 in the first shaft 2 than in the balloon catheters 1, 1A, and 1B. For this reason, when the balloon 5 moves in the blood vessel, the first shaft 2 can be more appropriately prevented from being distorted. Further, in the balloon catheter 1C, a sudden change in rigidity in the stretching direction can be further reduced as compared with the balloon catheters 1, 1A, and 1B. Therefore, when the balloon 5 moves in the blood vessel, the balloon catheter 1C can more appropriately suppress distortion at the portion where the rigidity changes.

1, 1A, 1B, 1C: balloon catheter 2: first shaft 2A: first proximal end 2B: first distal end 3: second shaft 3A: second proximal end 3B: second open distal end 4: tube 4A: Tube base end 4B: Tube tip 5: Balloon 32: Second tip 41: Peripheral hole 41A, 41B: End

Claims (1)

A balloon,
A first shaft including a first proximal end that is one end and a first distal end that is the other end, wherein the balloon is connected to the first distal end;
A tube extending from a peripheral wall hole formed in a peripheral wall of the first shaft, through a lumen of the first shaft, toward the first distal end, and through which a guide wire is inserted;
A second distal end, which is an end on one side; and a second distal end, which is an end on the other side, wherein the second distal end extends from the first proximal end of the first shaft to the lumen. , The second end portion includes a second shaft disposed closer to the first end portion than the peripheral wall hole,
The second end portion of the outer surface of the second shaft is joined to the first end portion of the inner surface of the first shaft,
A balloon catheter, wherein the rigidity of the second shaft decreases from the same position as the first proximal end of the first shaft toward the second distal end.

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