JP2011229819A - Balloon catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balloon catheter having a simple configuration which rewraps a balloon in a good condition when the balloon is deflated.SOLUTION: The balloon catheter 10 includes a tubular outer shaft 30 connected to the rear end side of the balloon 20, an inner shaft 40 inserted into the outer shaft 30 and connected to the distal end side of the balloon 20, and turning means attached to the outer shaft 30, pulling the inner shaft 40 in the rear end direction with respect to the outer shaft 30 and turning the inner shaft 40 in a direction A opposite to a folding direction B of the balloon 20. By operating the turning means while the balloon 20 is deflated, deflection of the inner shaft 40 is canceled and the balloon 20 is directed to return to an original folded condition.

Description

  The present invention relates to a balloon catheter used for dilating a blockage or stenosis in a body cavity such as a blood vessel.

Conventionally, a balloon catheter has been used to expand an obstructed part or a stenotic part in a body cavity such as a blood vessel. The balloon catheter is mainly composed of a balloon as an expansion body, an outer shaft, and an inner shaft arranged inside the balloon. The inner shaft is for inserting a guide wire, and the outer shaft is used for circulating a liquid such as a contrast medium or physiological saline for expanding the balloon through a lumen provided between the inner shaft and the inner shaft. Is.
The balloon of such a balloon catheter is divided into a plurality of small pieces before being used, and is folded so that these small pieces are wound around the inner shaft. From this state, the balloon is expanded to treat the occluded portion and the stenosis portion, and then contracted and pulled out of the body. In order to facilitate this drawing operation, the balloon needs to be folded in substantially the same shape as before expansion. Further, when the balloon once taken out is inserted into the body again and used, this folding needs to be performed well.

  Folding the balloon again is called wrapping, and whether or not it can be wrapped well is one of the important performances of the balloon catheter. The balloon is folded using a mold, and a process is performed in which the folded state is retained and stored by applying heat, but once expanded, the balloon does not necessarily return to its original state when deflated. Not necessarily.

In order to improve the problem caused by such a balloon rewrap defect, there is provided a means for extending the deflated balloon in the axial direction of the catheter so that the balloon catheter can be easily taken out (for example, Patent Document 1 below). reference).
Further, as a cause of worsening balloon rewrap, the inner shaft is bent due to the pressure when the balloon is expanded or the balloon is contracted in the axial direction, and the bent inner shaft enters the expanded balloon and contracts. Inhibiting proper folding.
In order to prevent such bending of the inner shaft, a balloon catheter provided with a spring that biases the inner shaft in the axial direction has been proposed (for example, see Patent Document 2 below).

JP-A-4-236964 JP 2000-176020 A

Among the conventional techniques as described above, the means as shown in Patent Document 1 stretches a balloon that has already been deflated, so that the balloon catheter can be easily pulled out of the body, but the shape itself of the balloon when it is re-wrapped. It does not improve. For this reason, when the balloon catheter is inserted again into the body, the shape of the rewrapped balloon may not be good. In such a case, an operator such as a doctor needs to refold the balloon. The catheter may not be reinserted quickly.
In addition, a device provided with a device such as a means for urging the inner shaft inside as shown in Patent Document 2 prevents the inner shaft from being bent, so that the inner shaft once bent is eliminated. It may not be possible.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a balloon catheter capable of improving the rewrap state when the balloon is deflated with a simple configuration. To do. It is another object of the present invention to provide a balloon catheter that can be easily pulled out of the body of the balloon catheter and can be quickly inserted and used again.

  In the present invention, the above problems are solved by the means listed below.

<1> A balloon, a tubular outer shaft connected to at least a part on the rear end side of the balloon, and an inner shaft inserted into the outer shaft and connected to at least a part on the tip side of the balloon And a rotating means attached to the outer shaft, pulling the inner shaft toward the rear end with respect to the outer shaft, and rotating the inner shaft in a direction opposite to the direction in which the balloon is folded. A balloon catheter characterized by.

<2> The rotating means is a cylindrical main body attached to the outer shaft, is movable in the axial direction with respect to the main body, and is fitted to the main body so as to be rotatable. The balloon catheter according to Aspect 1, wherein the balloon catheter comprises a rotating part connected to the inner shaft.

<3> The rotating means is provided in the main body portion in a direction inclined with respect to the axis of the main body portion, and provided in the rotating portion, and is movable along the guide groove. 3. The balloon catheter according to aspect 2, wherein the balloon catheter is composed of a rotation pin that is inserted into a guide groove and protrudes to the side of the main body.

<4> The guide groove is provided at one end of the guide groove, and is formed in parallel with the axial direction of the main body, and the first locking portion that positions the rotation pin at a first position; The above aspect 3, further comprising: a second locking portion that is provided at the other end of the guide groove and is formed in parallel with the axial direction of the main body portion and positions the rotation pin at the second position. The balloon catheter according to 1.

<5> The above-described first locking portion and the second locking portion of the guide groove are formed in parallel to the axial direction of the main body portion and toward the distal end direction, respectively. The balloon catheter according to aspect 4.

<6> The main body portion of the rotating means includes a fluid port for supplying a fluid for expanding the balloon, and the rotating portion of the rotating means is a guide wire port for inserting a guide wire. The balloon catheter according to any one of the above aspects 2 to 5, wherein the rotating means constitutes a connector attached to an end portion on the rear end side of the outer shaft.

<1> The balloon catheter of the present invention is provided by applying a rotational force in the axial direction rearward to the inner shaft and a rotational force in the direction of winding the balloon (the direction opposite to the direction in which the balloon is folded) by the rotating means. It is possible to eliminate the bending of the inner shaft and to give the directionality for folding the balloon as it is. Since the rotating means is rotated by the operator, it is possible to reliably apply a pulling force and a rotating force to the inner shaft. For this reason, the state of balloon wrapping can be improved with high accuracy.
Therefore, since the balloon catheter of the present invention can be folded well again, the balloon catheter can be easily taken out from the body. Further, it is possible to prevent the balloon in a state where it is not properly folded from being damaged inside the body such as a blood vessel when the balloon is pulled out of the body.
Furthermore, even when the balloon catheter taken out from the body is inserted into the body again, the balloon catheter can be quickly inserted into the body without performing the operation of folding the balloon again.

<2> In aspect 2 of the present invention, the rotating means is connected to the cylindrical main body portion attached to the outer shaft and the inner shaft, and is movable in the axial direction with respect to the main body portion. It becomes a simple structure which consists of the rotation part which can move. For this reason, a rotation means can be reduced in size and it prevents that a procedure is inhibited.

<3> In the aspect 3 of the present invention, since the rotation means further includes a guide groove formed in the inclination direction in the main body portion and a rotation pin protruding to the side of the main body portion, the inclination and the length of the guide groove. By adjusting the length, it is possible to set in advance the distance to displace the inner shaft to the rear end side and the angle to rotate. For this reason, it is sufficient for the technician to slide the rotation pin along the guide groove with his / her finger without being aware of the distance and angle to move the inner shaft, so the balloon can be folded again with a very simple operation. It becomes possible.

<4> In the aspect 4 of the present invention, the first locking portion that is formed at both ends of the guide groove in parallel with the axial direction of the main body portion and positions the rotation pin at the first position, and the second position. A second locking portion for positioning is provided. For this reason, the operator can easily perform the operation during the normal operation such as when the balloon catheter is expanded because the rotating means is fixed.

<5> In aspect 5 of the present invention, the first locking portion and the second locking portion of the guide groove are formed in parallel to the axial direction of the main body portion and toward the distal end direction. Since this direction is the same as the direction in which the inner shaft is bent and the force drawn into the balloon acts, the rotating pins fixed to the first locking portion and the second locking portion are inadvertently engaged with the first engagement portion. It can prevent coming off from a stop part and a 2nd latching | locking part.

<6> In aspect 6 of the present invention, a special device is newly provided to constitute a connector including a fluid port for supplying fluid for expanding the balloon and a guide wire port for inserting the guide wire. Is not attached to the balloon catheter, and the configuration of the balloon catheter can be maintained in a very simple configuration.
Further, since the operator can operate the rotating means on the hand side in the same manner as the guide wire insertion operation performed by the connector and the balloon expansion operation by the indeflator, a quick and reliable operation can be performed.

FIG. 1 is an overall view of a balloon catheter according to the present embodiment. FIG. 2 is a view showing a state where the balloon is folded as seen from the direction of arrow II in FIG. FIG. 3 is an overall view of the connector of the present embodiment. 4 is a cross-sectional view of FIG. FIG. 5 is a diagram for explaining the operation of the rotation pin and the guide groove. FIG. 6 is a view showing a modified example of the guide groove. FIG. 7 is a diagram showing another embodiment.

The balloon catheter of the present embodiment will be described with reference to FIGS.
1, 3, and 4, the left side in the figure is the distal end side (distal side) to be inserted into the body, and the right side is the rear end side (hand side side, proximal side) operated by an operator such as a doctor.
The balloon catheter 10 is used for, for example, treatment of a blood vessel blockage or a stenosis of a lower limb, and has a total length of about 400 to about 1700 mm. In the present embodiment, the balloon catheter 10 is about 900 mm.
The balloon catheter 10 mainly includes a balloon 20, an outer shaft 30, an inner shaft 40, and a connector 50.
The outer shaft 30 is a resin tube-like member, and the inner shaft 40 is inserted substantially coaxially therein. A gap between the inner surface of the outer shaft 30 and the outer surface of the inner shaft 40 serves as an expansion lumen 31 for circulating a liquid such as a contrast medium for expanding the balloon 20 and physiological saline.

  The inner shaft 40 is a tube-shaped member made of resin, and has a guide wire lumen 41 for inserting a guide wire therein. The tip of the inner shaft 40 extends from the tip of the outer shaft 30.

The balloon 20 is a resin member, and has an expansion part 21 for expanding the balloon 20 in the center in the axial direction, a front end attachment part 22 on the front end side, and a rear end attachment part 23 on the rear end side.
The tip mounting portion 22 is fixed to the outer peripheral surface of the tip of the inner shaft 40.
The rear end attaching portion 23 is fixed to the distal end of the outer shaft 30. In the present embodiment, the rear end attaching portion 23 is fixed to the outer peripheral surface of the outer shaft 30.

FIG. 2 is a cross-sectional view seen from the direction II in FIG. As shown in FIG. 2, the balloon 20 is divided into three wings 20a when deflated, and is folded using a mold, and the folded state is retained and stored by applying heat. Processing is performed.
The number of wings 20a is not limited to three.

  2 and 1, the three wings 20a of the balloon 20 of the present embodiment are wound counterclockwise (in the direction of arrow B) about the axis of the inner shaft 40, as indicated by a two-dot chain line. It is folded. Therefore, in order to facilitate the folding of the three wings 20a, the inner shaft 40 is rotated in the direction of arrow A opposite to the direction of arrow B to the balloon 20, What is necessary is just to make the wing | blade part 20a wind around an outer periphery.

A pair of radiopaque markers 42 a and 42 b that are separated from each other by a predetermined distance are attached to a portion of the distal end portion of the inner shaft 40 that is located inside the expansion portion 21 of the balloon 20.
A tip 43 made of a resin that is more flexible than the resin forming the inner shaft 40 is attached to the tip of the inner shaft 40. The tip 43 is a cylindrical member having an opening at the tip, and communicates with the guide wire lumen 41 of the inner shaft 40.

A connector 50 is attached to the rear ends of the outer shaft 30 and the inner shaft 40.
A protector 51 for preventing the outer shaft 30 from being bent is attached between the rear end portion of the outer shaft 30 and the tip portion of the connector 50. 3 and 4 show a state where the protector 51 is removed from the connector 50. FIG.
The connector 50 is a substantially Y-shaped member, and mainly includes a main body portion 60, a rotation portion 70, and a fluid port portion 80.

The main body portion 60 is a substantially Y-shaped member having a branching portion 65 that branches into a side surface of a cylindrical member. Inside the main body 60, there are a small-diameter hole 61 and a large-diameter hole 62 formed coaxially with the outer shaft 30 and the inner shaft 40, and an inclined hole 63 formed inside the branching portion 65.
The small-diameter hole 61 is a hole having a circular cross-sectional shape, and has an inner diameter slightly larger than the outer diameter of the outer shaft 30. The outer shaft 30 is inserted through the outer shaft 30 and the main body of the connector 50. 60 is fixed with an adhesive or the like.
The large-diameter hole 62 is a hole having a circular cross-sectional shape that communicates with the small-diameter hole 62 on the distal end side, and has a larger inner diameter than the small-diameter hole 62. The large-diameter hole 62 has an opening 60a that opens toward the rear end on the rear end side, and the front end portion of the rotating portion 70 is slidably fitted therein.

  The rotating portion 70 has a guide wire port 71 that is a tapered hollow portion that is reduced in diameter toward the tip, and the rear end of the guide wire port 71 is an opening 71a. A connection hole 72 is formed on the distal end side of the guide wire port 71 of the rotating portion 70. The rear end of the inner shaft 40 is inserted into the connection hole 72 and is connected to the guide wire port 71. With such a configuration, a guide wire (not shown) is inserted into or removed from the inner shaft 40 through the opening 71 a of the guide wire port 71.

The distal end portion of the rotating portion 70 is made narrower at the distal end side with a contact portion 76 having a diameter substantially the same as the diameter of the rear end portion of the main body portion 60, and the large diameter hole portion 62 of the main body portion 60. It becomes the small diameter part 73 inserted in. The contact part 76 restricts the movement of the rotating part 70 in the distal direction by contacting the rear end surface of the main body part 60.
A seal member 75 having a circular cross-sectional shape and made of a resin such as urethane rubber is fixed to the tip of the small diameter portion 73.
The seal member 75 can slide inside the large-diameter hole 62 in a liquid-tight manner so that a liquid such as a contrast medium or physiological saline supplied into the large-diameter hole 62 of the main body 60 does not leak to the outside. It is inserted in. In the center of the seal member 75, the inner shaft 40 penetrates in the axial direction, and the rear end of the inner shaft 40 is positioned and fixed so as to be connected to the guide wire port 71.

  A rotation pin 74 is attached to the side surface of the seal member 75 in a direction perpendicular to the axial direction of the rotation unit 70. As shown in FIG. 5, the rotation pin 74 is inserted into a guide groove 64 formed on the side surface of the main body portion 60, and moves along the guide groove 64. The head 74b is attached to the tip of the shaft 74a for operation with a finger.

The guide groove 64 is a groove formed through the outer peripheral surface of the main body 60, and includes a first locking portion 64a and a second locking portion 64b, and the first and second locking portions 64a and 64b. And a slide part 64c for connecting the two.
The slide part 64 c is formed in a direction inclined with respect to the axial direction of the main body part 60.

  The first locking portion 64a and the second locking portion 64b are portions that extend slightly toward the distal end side in the axial direction of the main body portion 60, and engage the shaft portion 74a of the rotation pin 74 so that the rotation pin 74 is engaged. The position of is fixed. The first and second locking portions 64a and 64b extend toward the distal end side in the axial direction, so that the force toward the distal end is applied to the rotation pin 74 attached to the seal member 75 of the rotation portion 70 due to the bending of the inner shaft 40. Even if this works, the rotation pin 74 is prevented from being detached from the first and second locking portions 64a and 64b. Further, the width of the first locking portion 64a is substantially the same as the diameter of the shaft portion 74a of the rotation pin 74, and both are frictionally engaged. For this reason, even when the pressure in the connector 50 is increased by the fluid supplied into the connector 50 and a force toward the rear end acts on the rotation pin 74 via the seal member 75, the rotation pin 74 is The first locking portion 64a is not easily detached.

In FIGS. 1, 3, and 5, the first locking portion 64a is located below the second locking portion 64b and on the tip side. The distance L in the axial direction between the first locking portion 64a and the second locking portion 64b is preferably set to about 3.0 to 10.0 mm. In the present embodiment, the distance L is about 3.0 mm. Is set.
In addition, the larger the rotation angle θ when the rotation pin 74 moves from the first locking portion 64a to the second locking portion 64b through the slide portion 64c, the better. Thus, it is preferably set to about 90 to 180 °. In the present embodiment, the angle is set to about 180 °.

This rotational direction is the direction of arrow A in FIGS. 2 and 3, and is opposite to the direction B in which the wing 20a of the balloon 20 is folded, as shown in FIG. In other words, the direction A is a direction in which the wing portion 20a of the balloon 20 can be wound around the outer periphery of the inner shaft 40 when the inner shaft 40 is rotated.
When the portion to which the balloon catheter 10 is applied and the overall length are different, the distance L and the rotation angle θ described above are appropriately set so as to be adapted to the balloon catheter.

The main body 60 including the guide groove 64 and the rotation unit 70 including the rotation pin 74 constitute rotation means. With this configuration, when the operator moves the rotation pin 74 from the first locking portion 64 a to the second locking portion 64 b, the rotation portion 70 is integrally moved backward by a distance L with respect to the main body portion 60. As it moves, it rotates in the direction of arrow A by an angle θ. The inner shaft 40 is rotated in the direction of arrow A by the rotation of the rotating unit 70.
1, 3, and 5, the dimensional ratio of the guide groove 64 is slightly different from the dimensional ratio in the case of the distance L and the angle θ described above for easy understanding of the drawings.

The inclined hole portion 63 provided in the branch portion 65 of the main body portion 60 communicates with the large diameter hole portion 62. The inclined hole portion 63 has an opening 63a that opens toward the rear end on the rear end side, and the fluid port portion 80 is fitted therein.
The fluid port portion 80 is a cylindrical member having a through hole 80a. One end of the through hole 80a communicates with the inclined hole portion 63, and an indeflator (not shown) is connected to the other end. With this configuration, a liquid such as a contrast medium or physiological saline for expanding the balloon 20 is supplied from the indeflator into the connector 50, and the balloon catheter 20 is expanded via the expansion lumen 31.

  Based on the above configuration, a case will be described in which the balloon catheter 10 of the present embodiment is used for a procedure for expanding a stenosis in an artery of a lower limb.

In the initial state, the balloon catheter 10 is in a state in which the wing portion 20a of the balloon 20 is folded in the direction of arrow B as shown in FIG. 2, and the rotation pin 74 is positioned at the first locking portion 64a. .
A guide wire is inserted in advance into the artery of the lower limb with the stenosis, and the balloon catheter 10 is inserted into the body along this guide wire. The guide wire is inserted from the opening provided at the tip of the tip 43 of the balloon catheter 10, passes through the inner shaft 40, and extends from the opening 71 a at the rear end of the rotating portion 70 of the connector 50.

The operator positions the balloon 20 in the stenosis that is the target site using the markers 42a and 42b under radioscopy, and then the contrast medium and physiological saline from the indeflator (not shown) connected to the fluid port 80 of the connector 50. An expansion liquid such as water is supplied.
The liquid passes through the through hole 80 a of the fluid port 80, the inclined hole 63 of the main body 60, and the large diameter hole 62 and flows into the expansion lumen 31 provided between the inner shaft 40 and the outer shaft 30. At this time, the rear end side of the large-diameter hole 62 of the main body 60 is liquid-tightly sealed by the seal member 75, so that no liquid leaks out of the connector 50.

Thus, the liquid supplied to the expansion lumen 31 expands the balloon 20 attached to the tip of the outer shaft 30.
At this time, there is a possibility that the inner shaft 40 is bent due to the pressure of the liquid or the axial contraction accompanying the radial expansion of the balloon 20. Even if a pulling force acting in the distal direction acts on the turning pin 74 attached to the seal member 75 of the turning portion 70 due to the bending of the inner shaft 40, the first locking portion 64a extends in the tip direction. The rotation pin 74 is reliably locked in the first locking portion 64a and is prevented from coming off.

Once the procedure for expanding the stenosis with the balloon 20 is completed, the balloon 20 is contracted. At this time, the inner shaft 40 may be bent as described above. When the balloon 20 is deflated, the balloon 20 may not be folded as in the initial state.
Therefore, the operator moves the rotation pin 74 provided on the connector 50 from the first locking portion 64a to the second locking portion 64b before the balloon 20 is deflated. In this operation, the rotation pin 74 can be operated with the thumb while holding the connector 50 in the hand of the operator, so that the operator can use one hand without being aware of the movement amount and the rotation amount of the inner shaft 40. Can be easily operated.
By this operation, the entire rotation part 70 of the connector 50 is moved by the distance L backward with respect to the main body part 60 together with the inner shaft 40 and simultaneously rotated by the angle θ.

Since the distal end of the inner shaft 40 is connected to the distal end side of the balloon 20 by the distal end mounting portion 22, the three wing portions 20 a of the balloon 20 are placed around the inner shaft 40 via the inner shaft 40. A rotation in the winding direction is given.
More specifically, since the rear end side of the balloon 20 is attached to the front end of the outer shaft 30 by the rear end attachment portion 23, the balloon 20 is rotated by the rear end portion fixed by the outer shaft 30 and the inner shaft 40. However, in order to fold the wing part 20a of the balloon 20 to the original position, such rotation by twisting is sufficient. That is, the deflection of the inner shaft 40, which is a factor that the balloon 20 is not folded back, is eliminated by the movement of the distance L, and the wing portion 20a of the balloon 20 is maintained in advance to the original shape. Since heat treatment or the like is applied, when the balloon 20 is deflated, the balloon 20 is automatically folded according to the shape given in advance if the wing portion 20a is given a direction to be folded back. Therefore, there is no need to actively wrap the wings 20a.

  Based on such a viewpoint, the distance L and the rotation angle θ for moving the rotation pin 74 are set. In the case of the present embodiment, the distance L is set to about 3.0 mm as described above. The rotation angle θ is set to about 180 °.

After the rotation pin 74 is moved from the first locking portion 64a to the second locking portion 64b in this way, the operator discharges the expansion liquid from the balloon 20 by an indeflator (not shown), and the balloon 20 is shrunk.
At this time, the deflection of the inner shaft 40 is eliminated, and the wing portion 20a of the balloon 20 is given a direction to be folded back to the original state, so that the wing portion 20a of the balloon 20 is folded well again.

  After the deflation of the balloon 20 is completed, the balloon catheter 10 is pulled out of the body. At this time, since the balloon 20 is appropriately folded, the balloon 20 can smoothly pass through the blood vessel, and the balloon catheter 10 can be easily pulled out of the body. Further, it is possible to prevent the inside of the blood vessel from being damaged by the wing portion 20a.

Although one cycle of the procedure of the balloon catheter 10 is completed by the above procedure, the balloon catheter 10 taken out of the body for reasons such as insufficient expansion of the stenosis may be inserted into the body and used again. is there. Even in such a case, since the balloon 20 is in a well folded state, the operator does not need to correct the folding failure of the balloon 20, and quickly inserts the balloon catheter 10 into the body again. Work can be done.
When the balloon 20 is expanded again in the body, the balloon 20 is positioned at the narrowed portion, and then the rotation pin 74 is returned from the second locking portion 64b to the first locking portion 64a, so that the balloon catheter 10 is initialized. The balloon 20 is expanded after being in the state.

  As described above, the balloon catheter 10 according to the present embodiment moves the rotation portion 70 rearward by moving the rotation pin 74 provided in the connector 50 along the guide groove 64, and the inner shaft 40. By applying an axially rearward pulling force and a rotational force in the direction of winding up the wing part 20a of the balloon 20, the inner shaft 40 can be flexed and folded back to the wing part 20a of the balloon 20. Directionality can be imparted. For this reason, since the wing | blade part 20a of the balloon 20 can be folded well again, taking out of the balloon catheter 10 out of the body and expansion again become easy, and a procedure can be performed rapidly.

  The embodiment described above uses the balloon catheter 10 for the treatment of the blood vessels of the lower limbs, but can be used for various procedures such as a procedure for expanding the coronary artery of the heart or a shunt for dialysis.

FIG. 6 shows a modification of the guide groove 64. In the guide groove 164, the shape of the first locking portion 164a is different from the shape of the first locking portion 64a of the guide groove 64 described above, and the shapes of the second locking portion 164b and the slide portion 164c are respectively described above. The shape of the second locking portion 64b and the slide portion 64c of the guide groove 64 is the same.
The first locking portion 164a of the guide groove 164 in FIG. 6 has a portion that is further bent in a direction perpendicular to the axial direction from a portion that slightly extends toward the distal end side in the axial direction. With such a structure, as shown in FIG. 6, the rotation pin 74 is engaged with the bent portion of the first locking portion 164 a to rotate through the seal member 75 when the balloon 20 is expanded. It is possible to reliably prevent the pivot pin 74 from being disengaged from the first locking portion 164a regardless of the axial force acting on the pin 74 in the front end direction or the rear end side.

  FIG. 7 shows another embodiment of the rotating means provided in the connector 50. In the embodiment described above, movement and rotation are imparted rearward to the rotation unit 70 using the rotation pin 74 and the guide groove 64. On the other hand, in the embodiment shown in FIG. 7, the screw portion in which the outer periphery of the small diameter portion 73 provided at the tip of the rotating portion 70 and the rear end portion of the large diameter hole portion 62 of the main body portion 60 are engaged by the screw. 177 is provided. In this embodiment, the inner shaft 40 can be pulled backward and rotated by rotating the rotating portion 70 in the direction of arrow A and loosening the screw portion 177.

  In the embodiment described above, the rotating means is provided in the connector 50. However, the rotating means may be separated from the connector.

Further, in the embodiment described above, the balloon 20 is directly fixed to the inner shaft 40 by the distal end mounting portion 22, but the axial and rearward pulling force on the inner shaft and the balloon The balloon 20 does not necessarily have to be directly attached to the inner shaft 40 because it is sufficient to transmit the rotational force for folding the 20 wings 20a. For example, the structure which joins the chip | tip attached to the front-end | tip of the inner shaft 40, and the front-end | tip attachment part 22 of the balloon 20 can be taken.
Similarly, the balloon 20 is directly fixed to the outer shaft 30 by the rear end mounting portion 23 on the rear end side. However, the balloon 20 does not necessarily have to be directly attached to the outer shaft 30, and other members are used. It may be attached.

DESCRIPTION OF SYMBOLS 10 Balloon catheter 20 Balloon 22 Front end attachment part 23 Rear end attachment part 30 Outer shaft 40 Inner shaft 50 Connector 60 Main body part 64 Guide groove 64a First engagement part 64b Second engagement part 70 Rotation part 74 Rotation pin 75 Seal Member A Inner shaft rotation direction B Balloon folding direction

Claims (6)

With balloons,
A tubular outer shaft connected to at least a part of the rear end side of the balloon;
An inner shaft inserted into the outer shaft and connected to at least a part of the tip side of the balloon;
A rotating means attached to the outer shaft, pulling the inner shaft toward the rear end side with respect to the outer shaft, and rotating the inner shaft in a direction opposite to a direction in which the balloon is folded. A balloon catheter. The rotating means includes a cylindrical main body attached to the outer shaft;
2. The apparatus according to claim 1, further comprising a rotating part that is movable in the axial direction with respect to the main body part and is rotatably fitted to the main body part and connected to the inner shaft. The balloon catheter described. The rotating means includes a guide groove formed in the main body in a direction inclined with respect to the axis of the main body,
3. The rotation pin according to claim 2, further comprising a rotation pin that is provided in the rotation portion, is inserted into the guide groove so as to be movable along the guide groove, and protrudes to the side of the main body portion. Balloon catheter. The guide groove is provided at one end of the guide groove, is formed in parallel with the axial direction of the main body portion, and a first locking portion that positions the rotation pin at a first position;
2. A second locking portion that is provided at the other end of the guide groove and is formed in parallel with the axial direction of the main body to position the rotating pin at a second position. 4. The balloon catheter according to 3. The said 1st latching | locking part and the said 2nd latching | locking part of the said guide groove are respectively formed in parallel with the axial direction of the said main-body part, and toward the front-end | tip direction. The balloon catheter described. The body portion of the turning means comprises a fluid port for supplying fluid to expand the balloon;
The rotating portion of the rotating means includes a guide wire port for inserting a guide wire,
The balloon catheter according to any one of claims 2 to 5, wherein the rotating means constitutes a connector attached to an end portion on the rear end side of the outer shaft.