JP2016221082A - Balloon catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balloon catheter which is a rapid exchange type, capable of moving a balloon to a desired position.SOLUTION: A balloon catheter 1 comprises: a balloon 5; a first shaft 2 in which the balloon 5 is coupled to a first tip end part 2B thereof; a tube 4 which extends toward the first tip end part 2B through a lumen 21A of the first shaft 2 from a peripheral wall hole 41 formed in a peripheral wall of the first shaft 2, and into which a guide wire is inserted; and a second shaft 3 in which a second tip end part 32 enters a lumen 211 from a first base end part 2A of the first shaft 2, and the second tip end part 32 is disposed closer to the first tip end part 2B side than the peripheral wall hole 41. The balloon catheter 1 is configured such that at least a part of the second shaft 3 is jointed to at least a part of the first tip end part 2B relative to the peripheral wall hole 41 on an inner face 211 of the first shaft 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a balloon catheter.

  2. Description of the Related Art Balloon catheters that are used for the treatment of dilating a stenotic site in a blood vessel are known. Patent Document 1 discloses a rapid exchange type 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 tip 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 portion of the distal shaft. is there. For this reason, when the balloon moves in the blood vessel, the distal shaft may be distorted due to the force in the direction opposite to the moving direction acting on the balloon. In this case, there is a problem that the balloon may not be moved to a constricted position in the blood vessel.

  An object of the present invention is to provide a rapidly exchangeable balloon catheter capable of moving a balloon to a desired position.

  The balloon catheter of the present invention includes a balloon, a first base end that is an end on one side, and a first tip that is an end on the other side, and the balloon is connected to the first tip. A first shaft and a tube extending from a peripheral wall hole formed in the peripheral wall of the first shaft through the lumen of the first shaft toward the first tip, and a tube through which a guide wire is inserted, A second proximal end portion that is an end portion on the side and a second distal end portion that is an end portion on the other side, and the second distal end portion extends from the first proximal end portion of the first shaft to the lumen. And the second tip portion includes a second shaft disposed closer to the first tip portion than the peripheral hole, and the first tip of the inner surface of the first shaft is more than the peripheral hole. That at least a portion of the second shaft is joined to at least a portion of the portion side. And butterflies.

  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 tip 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 first tip side portion 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 moving direction acts on the balloon, by applying the force in the moving direction to the portion on the first tip portion side of the first shaft, The first shaft can be prevented from being distorted. Therefore, the balloon catheter can appropriately move the balloon to a narrowed position in the blood vessel.

  In the present invention, of the inner surface of the first shaft, at least a part of the second shaft is joined to at least a part of the peripheral wall hole closer to the first tip than the end of the first tip. Also good. In this case, the balloon catheter can transmit the force when the second shaft is pushed into the blood vessel to a position closer to the balloon in the first shaft. Therefore, the balloon catheter can further appropriately prevent the first shaft from being distorted when the balloon moves in the blood vessel.

  In the present invention, at least a portion including the second tip portion of the second shaft may be joined to at least a portion of the inner surface of the first shaft closer to the first tip portion side than the peripheral wall hole. In this case, the force when the second shaft is pushed into the blood vessel can be transmitted from the second tip of the second shaft to the first shaft.

  In the present invention, the second tip portion of the second shaft may be joined to a part of the inner surface of the first shaft closer to the first tip portion than the peripheral wall hole. In this case, since a 1st shaft and a 2nd shaft can be joined easily, a balloon catheter can be produced easily.

  In the present invention, the rigidity of the portion of the second shaft closer to the second tip portion than the peripheral wall hole may become smaller toward the second tip portion. In this case, the balloon catheter can reduce a sudden change in rigidity in the extending direction.

1 is a side view of a balloon catheter 1. FIG. 3 is an enlarged plan view of the vicinity of a peripheral wall hole 41 of the balloon catheter 1. FIG. 3 is an enlarged cross-sectional view of the vicinity of a peripheral wall hole 41 of the balloon catheter 1. FIG. It is the side view to which the vicinity of the surrounding wall hole 41 of the balloon catheter 1A in a 1st modification was expanded. It is the side view to which the vicinity of the surrounding wall hole 41 of the balloon catheter 1B in a 2nd modification was expanded. 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 rapid 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. In addition, the 1st shaft 2 may be called a distal shaft etc. The second shaft 3 may be called a proxy shaft or the like. The lumen of the tube 4 may be called a lumen (for a guide wire) or the like. Details of each will be described below. In addition, each site | part of this invention is not limited to the site generally prescribed | regulated by said common name (a distal shaft, a proxy shaft, a lumen | rumen). Hereinafter, the direction extending along the balloon catheter 1 is referred to as “stretching direction”. Of the both sides of the balloon catheter 1 in the extending direction, the side on which the balloon 5 is provided is referred to as “tip side”, and the side opposite to the tip side is referred to as “base end side”. The left side of FIG. 1 corresponds to the distal end side, and the right side corresponds to the proximal end side. In the direction perpendicular to the extending direction, the side close to the center of the cross section of the balloon catheter 1 is referred to as “inside”, and the side away from the center of the cross section of the balloon catheter 1 is referred to as “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 extending 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 both ends of the first shaft 2 in the extending direction, the open end on the base end side is referred to as “first base end 2A”, and the open end on the front end side is referred to as “first front end 2B”.

  In the above, the material of the 1st shaft 2 is not limited to a polyamide-type resin, It can change into the other material which has flexibility. For example, a synthetic resin material such as a polyethylene resin, a polypropylene resin, a polyurethane resin, or a polyimide resin may be used as the material of the first shaft 2. An additive may be mixed in the synthetic resin material.

<Balloon 5>
The balloon 5 is provided at the first tip portion 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 51 </ b> A is referred to as “lumen 511”. The proximal end of the balloon 5 is connected to the first distal end 2B of the first shaft 2. The balloon 5 can be deformed into a state contracted inward and a state expanded in outward. The balloon 5 expands in a state where compressed fluid is supplied from a hub described later, and contracts in a state where compressed fluid is not supplied. FIG. 1 shows the balloon 5 in an inflated state. The balloon 5 is formed of a polyamide resin. Hereinafter, the end portion on the proximal end side of the balloon 5 is referred to as “balloon proximal end portion 5A”, and the end portion on the distal end side is referred to as “balloon distal end portion 5B”.

  In the above, the balloon 5 may be provided integrally with the first shaft 2 at the first tip portion 2B of the first shaft 2. That is, the balloon may be formed as a part of the end portion on the distal end side of the first shaft 2. The material of the balloon 5 is not limited to the polyamide-based resin, and can be changed to another material having flexibility. For example, as the material of the balloon 5, polyethylene resin, polypropylene resin, polyurethane resin, 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 that of the first shaft 2. The tube 4 extends in the extending direction. The inner diameter of the tube 4 is substantially the same over the entire region in the extending direction. The outer diameter of the tube 4 is smaller than the inner diameter of the first shaft 2. An end portion on the proximal end side 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 end portion on the proximal end side of the tube 4 communicates. Hereinafter, the end portion on the base end side of the tube 4 is referred to as “tube base end portion 4A”. The material of the tube 4 may be different from the material of the first shaft 2. 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 tip portion 2B side of the first shaft 2. The tube 4 further extends from the first tip portion 2B toward the tip side. 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 end portion on the distal end side of the tube 4 is disposed closer to the distal end side than the balloon distal end portion 5B. Hereinafter, the end portion on the distal end side of the tube 4 is referred to as “tube distal end portion 4B”. Of the outer surface 42B, which is the outer surface of the tube 4, the balloon distal end portion 5B is connected to a portion slightly proximal to the tube distal end portion 4B.

  In the above, the tube 4 and the balloon 5 may be joined in a different manner. For example, the tube tip 4 </ b> B of the tube 4 may be inserted through the peripheral wall on the tip of the balloon 5.

<Second shaft 3>
The second shaft 3 is a tubular member having flexibility. 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 31 </ b> A that 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 of the second shaft 3 in the extending direction, the opening end on the base end side is referred to as “second base end 3A”, and the opening end on the tip end is referred to as “second opening tip 3B”. .

  A hub (not shown) is connected to the second base end portion 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 another virtual plane (hereinafter referred to as “second virtual plane S2”) that is inclined with respect to a virtual plane (hereinafter referred to as “first virtual plane S1”) orthogonal to the extending direction. "). The acute angle θ1 formed by the first virtual plane S1 and the second virtual plane S2 is preferably a value within a range of 85 degrees or more and less than 90 degrees. The 2nd opening front-end | tip part 3B has the shape which cut | disconnected the cylindrical member by 2nd virtual plane S2. For this reason, the rigidity of the portion on the distal end side (arrow D1 side) is smaller than the rigidity of the portion on the proximal end side (arrow D2 side) than the portion 31 on the most proximal end side in the second opening distal end portion 3B. . Further, the rigidity of the portion on the tip side of the portion 31 of the second shaft 3 decreases as the portion 31 approaches the portion 32. Hereinafter, the most distal end portion 32 of the second opening distal end portion 3B is also referred to as a “second distal end portion 32”.

  In the above, the material of the 2nd shaft 3 is not limited to stainless steel, It can change into 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 3 </ b> B of the second shaft 3 enters the lumen 211 from the first proximal end portion 2 </ b> A of the first shaft 2. The second opening distal end portion 3B is disposed over the entire region in the distal end side with respect to the first proximal end portion 2A of the first shaft 2 and the proximal end side with respect to the first distal end portion 2B, that is, in the lumen 211. . The position P11 of the most proximal portion 31 of the second opening distal end portion 3B is an end portion on the first proximal end portion 2A side of the peripheral wall hole 41 of the first shaft 2 (hereinafter referred to as “end portion 41A”). It is arranged closer to the first base end 2A than the position P12. The position P13 of the second tip portion 32 of the second opening tip portion 3B is from the position P14 of the end portion on the first tip portion 2B side of the peripheral wall hole 41 of the first shaft 2 (hereinafter referred to as “end portion 41B”). Is also arranged on the first tip 2B side.

<Join of the first shaft 2 and the second shaft 3>
As shown in FIG. 3, of the outer surface 31 </ b> B that 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. 22 is joined. As described above, the position P13 of the second tip portion 32 is disposed closer to the first tip portion 2B (see FIG. 1) than the position P14 of the end portion 41B of the peripheral wall hole 41. A portion to which the adhesive 22 is attached, in other words, a portion slightly proximal to the second distal end portion 32 is also disposed closer to the first distal end portion 2B than the position P14. Therefore, the 1st shaft 2 and the 2nd shaft 3 are joined by the adhesive agent 22 in the 1st front-end | tip part 2B side rather than the position P14.

  A specific example of the bonding method using the adhesive 22 is as follows. A small hole is provided at a position corresponding to a portion of the first shaft 2 where the vicinity of the second tip portion 32 of the second shaft 3 is joined. The adhesive 22 is injected into the lumen 211 of the first shaft 2 from the outside through the provided hole. The injected adhesive 22 joins the inner surface 21 </ b> A of the first shaft 2 and a portion slightly proximal to the second tip portion 32 of the second shaft 3.

  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 locations, the vicinity of the second distal end portion 32 of the second shaft 3 and the first base end portion 2 </ b> A 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 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 laser beam may be irradiated from the outside to a portion of the outer surface of the peripheral wall of the first shaft 2 where the vicinity of the second tip portion 32 of the second shaft 3 is joined. Of the inner surface 21A of the first shaft 2, a portion 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 tip portion 32 of the second shaft 3, so that both may be joined.

<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 distal end portion 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 arranged at a narrowed portion of the blood vessel. The compressed fluid is supplied to the lumen 311 from a hub (not shown) connected to the second base end portion 3 </ b> A of the second shaft 3. In addition, since the first base end portion 2 </ b> A of the first shaft 2 is connected to the outer surface 31 </ b> B 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 from the second shaft 3 into the lumen 211 of the first shaft 2 via the second opening tip 3B. The compressed fluid further flows from the first shaft 2 into the lumen 511 of the balloon 5 via the first tip 2B. The compressed fluid that has flowed into the balloon 5 inflates the balloon 5. Thereby, the constricted part of the blood vessel is expanded.

<Main functions and effects of this embodiment>
As described above, in the balloon catheter 1, the second shaft 3 is joined to the inner surface 21 </ b> A of the first shaft 2 closer to the first tip portion 2 </ b> B than the peripheral wall hole 41. For this reason, the balloon catheter 1 uses the force when the second shaft 3 is pushed into the blood vessel in order to place the balloon 5 in the narrowed portion of the blood vessel along the guide wire. 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 moving direction acts on the balloon 5, the force in the moving direction acts on the portion of the first shaft 2 on the first tip portion 2B side. By making it, it can suppress that the 1st shaft 2 is distorted. Therefore, the balloon catheter 1 can appropriately move the balloon 5 to a narrowed position in the blood vessel.

  In the balloon catheter 1, a portion of the second shaft 3 that is slightly proximal to the second distal end portion 32 is an end portion of the inner wall 21 </ b> A of the first shaft 2 on the first distal end portion 2 </ b> B side of the peripheral wall hole 41. Bonded by the adhesive 22 to the first tip 2B side than 41B. 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 suppress the distortion of the first shaft 2 when the balloon 5 moves in the blood vessel. Further, in the balloon catheter 1, the position in the vicinity of the second tip portion 32 of the second shaft 3 is joined 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 through a portion of the second shaft 3 that is closer to the balloon 5.

  In the balloon catheter 1, only the portion slightly proximal to the second distal end portion 32 among the portion of the second shaft 3 on the first distal end portion 2 </ b> B side with respect to the peripheral wall hole 41 is adhered to the first shaft by the adhesive 22. 2 is joined to the inner surface 21A. In this case, since the joining area | region of the 1st shaft 2 and the 2nd shaft 3 can be suppressed to the minimum, the balloon catheter 1 can be produced easily.

  Since the second shaft 3 has 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 the portion where the change in rigidity is large is likely to be distorted when the second shaft 3 is pushed into the blood vessel. On the other hand, the rigidity in the extending direction of the second shaft 3 is closer to the second distal end portion 32 in the second distal end portion 32 side than the most proximal end portion 31 in the second opening distal end portion 3B. Get smaller. Thereby, a sudden change in rigidity in the extending direction of the balloon catheter 1 can be reduced. Therefore, when the balloon 5 moves in the blood vessel, the balloon catheter 1 can be prevented from being distorted at the rigidity changing portion in the extending direction when a force in the direction opposite to the moving direction is applied to the balloon 5.

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

  The acute angle θ1 formed by the second virtual plane S2 where the second opening tip 3B of the second shaft 3 of the balloon catheter 1 is arranged and the first virtual plane S1 is limited to a range of 85 degrees or more and less than 90 degrees. Other angles may also be used. For example, the acute angle θ1 formed by the second virtual plane S2 and the first virtual plane S1 may be 0 degrees. That is, the 2nd opening front-end | tip part 3B of the 2nd shaft 3 may have a shape which cut | disconnected the cylindrical member in 1st virtual plane S1. In the case of such a shape, at least one groove extending from the second opening distal end portion 3 </ b> B of the second shaft 3 toward the proximal 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 toward the proximal end side. In this case, the rigidity of the second shaft 3 becomes smaller toward the second tip portion 32 as in the above embodiment.

  A balloon catheter 1A (see FIG. 4) and 1B (see FIG. 5) in a modified example will be described with reference to FIGS. The balloon catheters 1A and 1B are different from the balloon catheter 1 in the joining region between the inner surface 21A of the first shaft 2 and the outer surface 31B 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 region to which the adhesive 22A adheres is longer on the proximal end side than the region to which the adhesive 22 adheres in FIG. In this case, the balloon catheter 1A can firmly join the first shaft 2 and the second shaft 3 as compared with the balloon catheter 1.

  In the balloon catheter 1A, the region to which the adhesive 22A adheres may be longer on the proximal side than in the case of FIG. For example, the adhesive 22 </ b> A may adhere to the base end side of the outer surface 31 </ b> B of the second shaft 3 from the position P <b> 14 of the end 41 </ b> B of the peripheral wall hole 41. Further, for example, the adhesive 22 </ b> A may adhere to the base end side of the outer surface 31 </ b> B of the second shaft 3 from the position P <b> 12 of the end portion 41 </ b> A of the peripheral wall hole 41. Further, for example, the adhesive 22 </ b> A may adhere to the first base end portion 2 </ b> A of the first shaft 2 in the outer surface 31 </ b> B of the second shaft 3. That is, you may join the 1st shaft 2 and the 2nd shaft 3 over the whole region of the part which overlaps with an extending | stretching direction.

  In the balloon catheter 1A, the region to which the adhesive 22A is attached 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 tip 32 of the outer surface 31 </ b> B of the second shaft 3.

  As shown in FIG. 5, in the balloon catheter 1B according to the second modification, the first shaft 2 and the second shaft 3 are joined by adhesives 22B and 22C. The region to which the adhesive 22B is attached is closer to the tip than the region to which the adhesive 22 is attached in FIG. Specifically, the region to which the adhesive 22B adheres is a region including the second tip portion 32. On the other hand, the adhesive 22C is attached to a region separated by a predetermined distance on the base end side with respect to the adhesive 22B. That is, the first shaft 2 and the second shaft 3 are joined at two locations in the portion closer to the first base end portion 2A (see FIG. 1) than the peripheral wall hole 41. In this case, the balloon catheter 1B can firmly join the first shaft 2 and the second shaft 3 as compared to the balloon catheter 1 (see FIG. 1). Moreover, since the area | region adhere | attached with an adhesive agent can be suppressed compared with 1 A of balloon catheters (refer FIG. 4), the balloon catheter 1B can be produced easily.

  In the balloon catheter 1B, the region to which the adhesive 22C adheres may be further on the proximal side than in the case of FIG. For example, the adhesive 22C may adhere to the base end side of the outer surface 31B of the second shaft 3 from the position P14 of the end portion 41B of the peripheral wall hole 41. Furthermore, for example, the adhesive 22 </ b> C may adhere to the base end side of the outer surface 31 </ b> B of the second shaft 3 with respect to the position P <b> 12 of the end portion 41 </ b> A of the peripheral wall hole 41. Further, in the balloon catheter 1B, the region to which the adhesive 22B adheres may be closer to the base end than in the case of FIG. For example, the adhesive 22B may be in the same position as the region to which the adhesive 22 is attached in FIG.

  Further, in FIG. 5, the number of joints between the first shaft 2 and the second shaft 3 in the portion closer to the first tip 2B (see FIG. 1) than the peripheral wall hole 41 is not limited to two, and three locations. 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 portion 32.

  With reference to FIG. 6, the balloon catheter 1C in the third modification will be described. The balloon catheter 1C is different 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, in the second opening distal end portion 3B, the position in the extending direction of the position P21 of the most proximal portion 31 is substantially the same as the first proximal end portion 2A of the first shaft 2. The position P23 of the second distal end portion 32 of the second opening distal end portion 3B is disposed slightly on the proximal end side of the first distal end portion 2B of the first shaft 2. Therefore, 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 formed by the first virtual plane S1 and the third virtual plane S3 is The angle is larger than the acute angle θ1 (see FIG. 1) formed by the first virtual plane S1 and the second virtual plane S2. The rigidity in the extending direction of the second shaft 3 decreases as the distance from the portion 31 approaches the second tip portion 32. Of the outer surface 31B of the second shaft 3, the portion slightly proximal to the second distal end 32 is the same as the balloon catheter 1 (see FIG. 1), 1A (see FIG. 4), and 1B (see FIG. 5). The inner surface 21A of the first shaft 2 is joined by an adhesive. In the balloon catheter 1C, the region to which 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 portion 2B of the inner surface 21A of the first shaft 2 and a portion including the second tip portion 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, 1B. For this reason, when the balloon 5 moves in the blood vessel, it can suppress more appropriately that the 1st shaft 2 is distorted. In addition, the balloon catheter 1C can further reduce a sudden change in rigidity in the extending direction as compared with the balloon catheters 1, 1A, and 1B. Therefore, the balloon catheter 1 </ b> C can further appropriately suppress the distortion at the rigidity changing portion when the balloon 5 moves in the blood vessel.

1, 1A, 1B, 1C: Balloon catheter 2: First shaft 2A: First base end 2B: First tip 3: Second shaft 3A: Second base end 3B: Second opening tip 4: Tube 4A: Tube base end 4B: Tube tip 5: Balloon 32: Second tip 41: Peripheral wall holes 41A, 41B: End

Claims (5)

With balloons,
A first shaft that includes a first base end that is an end on one side and a first tip that is an end on the other side, the first shaft having the balloon connected to the first tip;
A tube extending from the peripheral wall hole formed in the peripheral wall of the first shaft to the first tip portion through the lumen of the first shaft, and through which the guide wire is inserted;
A second proximal end portion that is an end portion on one side and a second distal end portion that is an end portion on the other side, wherein the second distal end portion extends from the first proximal end portion of the first shaft to the lumen. And the second tip is provided with a second shaft disposed closer to the first tip than the peripheral wall hole,
A balloon catheter characterized in that at least a part of the second shaft is joined to at least a part of the inner surface of the first shaft closer to the first tip than the peripheral wall hole.   Of the inner surface of the first shaft, at least a part of the second shaft is joined to at least a part of the peripheral wall hole closer to the first tip than the end of the first tip. The balloon catheter according to claim 1.   2. The inner surface of the first shaft, at least a portion including the second tip portion of the second shaft is joined to at least a portion of the first tip portion side of the peripheral wall hole. Or the balloon catheter of 2.   The balloon catheter according to claim 3, wherein the second tip of the second shaft is joined to a part of the inner surface of the first shaft closer to the first tip than the peripheral hole. .   The balloon according to any one of claims 1 to 4, wherein rigidity of a portion of the second shaft closer to the second distal end portion than the peripheral wall hole decreases toward the second distal end portion. catheter.

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