JP7385808B2 - Connector and branch connector - Google Patents

Description

The present invention relates to a connecting connector provided on the proximal end side of a guidewire tube, and a branch connector to which such a connecting connector can be applied.

2. Description of the Related Art Conventionally, catheters have been used for treatment and examination of body lumens such as blood vessels and the gastrointestinal tract.

By the way, when inserting a catheter into a lumen, a guide wire may be inserted through the catheter and the catheter may be pushed forward together with the guide wire. At this time, a mechanism is adopted at the proximal end of the catheter that allows the guidewire to be fixed as necessary so that the guidewire does not stick out from the catheter and damage the lumen wall.

Specifically, as a guidewire fixing mechanism, for example, Japanese Patent Application Laid-Open No. 9-51954 (Patent Document 1) discloses a ring-shaped elastic member ( A guidewire fixing device is disclosed in which a guidewire (58) is elastically deformed by tightening with a nut (56), and the inserted guidewire is tightened and fixed.

Japanese Patent Application Publication No. 9-51954

However, in the guide wire fixing device described in Patent Document 1, when the nut (56) is loosened to unfix the guide wire, a gap is created between the nut (56) and the elastic member (58). There was a concern that blood, etc. would leak outside through the gap.

Moreover, the guidewire fixing device having a conventional structure described in Patent Document 1 does not take into account fluid supply from the outside to the guidewire lumen while the guidewire fixing device is attached. Therefore, in order to externally inject a fluid, such as a lubricating fluid or a flushing fluid, into the guidewire lumen using a syringe or the like, the guidewire fixture must be removed from the catheter and the syringe or other fluid can be directly inserted into the proximal end of the catheter. needed to be connected.

That is, in the guide wire fixing device described in Patent Document 1, connection of a syringe for fluid injection, etc. is not structurally considered in the first place. Even if it were possible to inject fluid into the guidewire lumen from the outside with the guidewire fixing device attached, when the guidewire is not fixed, the nut (56) and the elastic member (58) will not fit together as described above. Fluid leaks out from the gap between them.

SUMMARY OF THE INVENTION An object of the present invention is to provide a connector with a novel structure that prevents unintentional leakage of fluid from a guidewire lumen.

Further, it is one of the problems to be solved by the present invention to provide a branch connector with a novel structure that makes it possible to employ a connecting connector with such a novel structure.

Hereinafter, preferred embodiments for understanding the present invention will be described. However, each of the embodiments described below is described by way of example, and may not only be adopted in combination with each other as appropriate, but also be described in each embodiment. The plurality of components can be recognized and employed as independently as possible, and can also be appropriately employed in combination with any of the components described in other embodiments. Accordingly, the present invention is not limited to the embodiments described below, and various other embodiments can be realized.

A first aspect is a connection connector provided on a proximal end side of a guidewire tube, which includes an elastic sealing member having an insertion hole communicating with a guidewire lumen of the guidewire tube, and an elastic sealing member provided with an insertion hole communicating with a guidewire lumen of the guidewire tube. A luer taper member for external connection communicates with the insertion hole and a fixing pressing member that applies a pressing force to the elastic seal member to tighten and fix the guide wire. Even when the pressing force against the member is minimized, the state of communication between the guide wire lumen, the insertion hole, and the luer taper member is maintained while maintaining a fluid-tight state between the elastic seal member and the luer taper member. The fixing pressing member is assembled so as to be movable in the direction toward and away from the elastic sealing member, and the fixing pressing member is movable in the direction away from the elastic sealing member. By bringing the elastic seal member into contact with the elastic seal member, a liquid-tight state is maintained between the elastic seal member and the luer taper member.

According to the connecting connector structured according to this aspect, since the connecting connector is provided with a luer taper member for external connection, a syringe or the like can be connected even when the connecting connector is attached to a catheter or the like. Further, even when the pressing force applied to the elastic seal member by the fixing pressing member is minimized, the liquid-tight state between the elastic seal member and the luer taper member is maintained. Therefore, when the guide wire is not fixed, fluid introduced into the body from a syringe or the like can be prevented from unintentionally leaking out through the gap between the elastic sealing member and the fixing pressing member or the luer taper member.

In addition, when the elastic seal member and the luer taper member are disposed adjacent to each other in the axial direction, it is sufficient that the liquid-tight state between the elastic seal member and the luer taper member is maintained. In addition, when a fixing press member is placed between the elastic seal member and the luer taper member in the axial direction, by maintaining a liquid-tight state between the elastic seal member and the fixing press member, the elastic A liquid-tight state between the seal member and the luer taper member can be maintained.

A second aspect is the connection connector according to the first aspect, wherein the fixing pressing member is located on the distal end side of the Luer taper member and is integrally configured with the Luer taper member. The distal end side end surface of the fixing pressing member is in contact with the proximal end side end surface of the elastic sealing member.

According to the connection connector structured according to this aspect, not only the number of parts can be reduced, but also fluid can flow into the external space through the gap that may occur when the fixing pressing member and the luer taper member are formed separately. Leakage can be avoided.

A third aspect of the connection connector according to the first or second aspect is that the elastic seal member is brought into contact with the proximal end side end surface of the elastic seal member to form a fluid-tight seal between the elastic seal member and the luer taper member. The contact surface on the side of the luer taper member that maintains the state has a smaller radial width dimension than the end surface on the proximal end side of the elastic seal member.

According to the connection connector structured according to this aspect, the fixing press member and the Luer taper member located on the proximal end side of the elastic seal member are pressed so as to bite into the elastic seal member, so that the fixing press member The sealing between the luer taper member and the elastic sealing member can be achieved more reliably.

A fourth aspect is that in the connection connector according to the third aspect, the contact surface has a substantially polygonal shape.

According to the connection connector structured according to this aspect, each corner of the substantially polygonal contact surface on the luer taper member side easily bites into the elastic sealing member. It is possible to improve the sealing performance between the contact surfaces of the elastic seal member and the elastic seal member. Note that, for the purpose of improving sealing performance due to corner biting, etc., the contact surface on the Luer taper member side is preferably in a polygonal shape having six or more corners.

In a fifth aspect, in the connection connector according to any one of the first to fourth aspects, the fixing pressing member is assembled so as to be movable toward and away from the elastic sealing member by a screw feeding mechanism. The fixing pressing member is brought into contact with the elastic seal member even at the end of movement in the direction of separation from the elastic seal member by the screw feeding mechanism, so that the elastic seal member and the luer taper member are in contact with each other. A liquid-tight state between the two is maintained.

According to the connecting connector structured according to the present aspect, by employing the screw feeding mechanism, the fixing pressing member approaches the elastic sealing member and moves in the direction of separation, that is, the fixed state and non-fixed state of the guide wire. Switching can be easily achieved. In addition, in this aspect, by positioning the fixing pressing member by the screw feeding mechanism at the end of movement in the direction of separation from the elastic sealing member, "the pressing force against the elastic sealing member is minimized" in the first aspect. ``state'' may be configured.

In a sixth aspect, in the connection connector according to the fifth aspect, the rotation operation part constituting the screw feeding mechanism is a separate part from the luer taper member and is capable of relative rotation with the luer taper member. It is something that exists.

According to the connection connector structured according to this aspect, rotational resistance of the rotational operation section can be suppressed by rotating the rotational operation section relative to the Luer taper member. As a result, the rotational resistance of the rotary operation part is reduced, and sliding due to relative rotation of the abutting surfaces of the elastic seal member and the fixing press member is also suppressed, so that the fixing press member contacts the elastic seal member. The stability of the biting portion can be improved, and the stability of the sealing performance can also be improved. In particular, when combined with the fourth aspect, the sealing performance can be more stably improved by biting into the elastic sealing member at each corner of the polygonal fixing pressing part.

In addition, since the rotation operation part and the luer taper member rotate relative to each other, when a syringe, etc. is connected to or removed from the luer taper member while rotating around the central axis, the syringe, etc. and the luer taper member rotate together, and the rotation is applied to the rotary operation section, and furthermore, due to the rotation of the rotation operation section, the fixing pressing member moves toward or away from the elastic seal member, and the insertion hole of the elastic seal member is unintentionally blocked or opened. This can be prevented from occurring.

A seventh aspect is that in the connection connector according to the sixth aspect, a locking protrusion is provided at a mounting site of the rotary operation section to define a moving end of the rotary operation section in the loosening direction. Accordingly, the end of movement of the fixing pressing member in the direction of separation from the elastic sealing member is defined.

According to the connection connector structured according to this aspect, the fixing press member can be prevented from falling off when the fixing press member moves in a direction away from the elastic seal member. Furthermore, the state of contact (seal) between the elastic seal member and the fixing press member can be maintained with a simple structure that only defines the moving end of the fixing press member.

By the way, a balloon catheter used for treating stenosis in a body cavity such as a blood vessel or esophagus has a guide lumen through which a guide wire is inserted, and a fluid inside a balloon, as shown in Japanese Patent Laid-Open No. 2002-143311, for example. It is equipped with an expansion lumen for supplying and discharging water. Further, the balloon catheter has a branch part on the proximal end side, and from the branch part, a guide shaft that communicates with the guide lumen and an inflation shaft that communicates with the inflation lumen are separated from each other. It's starting to extend. The connectors according to the first to seventh aspects described above can be suitably employed as the connectors provided on the proximal end side of the guide shaft in such a balloon catheter.

Here, in addition to the above-mentioned first to seventh aspects regarding the connection connector, the present invention also includes the following eighth and ninth aspects regarding a branch connector for a balloon catheter in which such a connection connector can be suitably employed.

That is, as disclosed in Japanese Patent Laid-Open No. 2002-143311, etc., a balloon catheter generally includes a guide shaft provided to penetrate the inside of the balloon. Then, the balloon is delivered to the treatment site in the body lumen with the guide wire inserted into the guide wire lumen, and pressurized fluid is supplied into the balloon through the balloon lumen.

However, in the part of a balloon catheter with a conventional structure that is inserted into the body, the balloon lumen and guide wire lumen have a common shaft structure, but the balloon shaft and guide shaft diverge from a branch part located outside the body and are mutually connected. It extends independently. Therefore, for example, each time a balloon is inflated or deflated or a guide wire is operated, the desired one must be selected from two shafts, which is cumbersome, and the other shaft remains hanging down. This sometimes interfered with operation.

Furthermore, as disclosed in the above publication, the connector on the proximal end of the guide shaft is provided with a fluid injection port separate from the guidewire insertion port, so lubricant and priming can be injected into the guidewire lumen. When injecting a solution or the like, it is necessary to seal the guide wire insertion port, which is a cumbersome task.

In addition, when delivering a balloon to a treatment site in a body lumen with a guidewire inserted into the guidewire lumen, the patent described above is designed to prevent the guidewire from being unintentionally pushed in and damaging the cavity wall. A guide wire fixing mechanism as described in Document 1 had to be separately prepared and attached to the proximal connector of the guide shaft, which required a large amount of labor.

The present invention also provides a balloon branch connector with a novel structure, which has at least one improvement over such a conventional balloon catheter structure so as to reduce the burden on the operator. Make it one of the objectives. Such balloon branch connectors belong to the same technical field related to catheters as the connection connectors according to the first to seventh aspects, and are said to aim at reducing labor or improving operations when operating guide wires, etc. They have a common problem and are related in that the connection connectors according to the above embodiments 1 to 7 can be suitably adopted.

An eighth aspect is a branch connector for a balloon provided on the proximal end side of a shaft having a balloon through which a guide wire tube is inserted on the distal end side, the branch connector being connected to the balloon lumen for the balloon. A balloon connector portion and a guidewire connector portion communicating with the guidewire lumen of the guidewire tube are provided in a non-communicating manner, and the guidewire connector portion includes a luer taper member for external connection. and a fixing mechanism for fixing the guide wire inserted into the guide wire lumen through the luer taper member , and the connecting connector according to any one of claims 1 to 7 is attached to the guide wire. It is provided as a wire connector .

In the balloon branch connector structured according to this aspect, both the balloon connector section and the guide wire connector section are integrally provided with a single connector structure. Therefore, when operating either the balloon or the guide wire, the shaft of the other does not hang down and become an obstacle.

In addition, since a luer connection part such as a syringe for injecting fluid from the outside can be directly connected to the luer taper member through which the guide wire is inserted, it is easy to inject lubricating fluid into the guide wire. Become.

Furthermore, since the guide wire fixing mechanism is provided, it is possible to avoid the risk of the guide wire unintentionally protruding ahead when inserting the balloon catheter into the lumen.

In addition, according to this aspect, it is possible to stably ensure the sealing performance of the guidewire connector portion of the balloon branch connector. That is, when the guidewire is not fixed, liquid tightness between the elastic sealing member and the luer taper member in the guidewire connector part (connection connector) is ensured, and unintended fluid is prevented, for example, when injecting fluid from the outside. Leakage can be prevented.

According to the present invention, the guidewire inserted into the guidewire lumen can be fixed, and the fluid tightness between the elastic seal member and the luer taper member communicated with the guidewire lumen can be maintained in a state where the guidewire is released. It becomes possible to realize a connection connector with a new structure that can secure the fluid and prevent unintended leakage of fluid.

Further, according to the present invention, a branch connector for a balloon with a novel structure is realized, which improves operability such as supplying and discharging fluid to the balloon lumen, inserting a guide wire into the guide wire lumen, and supplying fluid. It becomes possible.

A front view showing a branch connector for a balloon as a first embodiment of the present invention II-II sectional view in Figure 1 III-III sectional view in Figure 1 A vertical sectional view showing a specific example of a balloon catheter including the balloon branch connector shown in FIG. 1. A longitudinal sectional view showing the balloon branch connector shown in Fig. 1 with the guide wire tightened and fixed by the elastic sealing member. A front view showing a branch connector for a balloon as a second embodiment of the present invention VII-VII sectional view in Figure 6 VIII-VIII sectional view in Figure 6 A vertical cross-sectional view showing the balloon branch connector shown in FIG. 6 with the guide wire tightened and fixed by the elastic sealing member.

Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, in FIGS. 1 to 3, a balloon branch connector 10 according to a first embodiment of the present invention is shown in a state where the pressing force on an elastic seal member 56, which will be described later, is minimized. This balloon branch connector 10 is provided, for example, on the proximal end side of a shaft 14 in a balloon catheter 12 shown in FIG. In the following description, the distal end side refers to the left side in FIG. 4, which is the side of the balloon catheter 12 inserted into the patient, and the proximal end side refers to the side where the balloon catheter 12 is inserted into the patient. This refers to the right side in Figure 4, which is the side where the Further, the axial direction refers to the left-right direction in FIG. 4, which is the direction of the central axis of the shaft 14.

Although the structure of the balloon catheter 12 is not limited, in this embodiment, the shaft 14 has a double tube structure including an inner shaft 16 and an outer shaft 18 that are inserted into each other. The inner shaft 16 as a guide wire tube has a larger length dimension than the outer shaft 18 as a balloon tube, and the inner shaft 16 projects from the outer shaft 18 in the length direction.

A balloon 20 is attached to the distal end of the shaft 14. The balloon 20 is approximately cylindrical or bag-shaped, and the inner shaft 16 is disposed to pass through the balloon 20. The distal end of the balloon 20 is fixed and sealed to the outer peripheral surface of the distal end of the inner shaft 16, and the proximal end of the balloon 20 is fixed to the distal end of the outer shaft 18. Note that a distal tip 28 is fixed to the distal end of the inner shaft 16, and the guide wire 24 is projected from the distal hole of the distal tip 28.

Further, a guide wire 24 can be inserted through the inner hole of the inner shaft 16, and a guide wire lumen 26 is configured including the inner hole of the inner shaft 16. Note that a contrast marker 30 may be provided on the inner shaft 16 or the guide wire 24 at an appropriate position in the length direction, if necessary.

Furthermore, a space provided inside the outer shaft 18 and between the inner shaft 16 and the inner shaft 16 in the radial direction communicates with the inside of the balloon 20 . A balloon lumen 22 that supplies and discharges fluid to and from the balloon 20 includes this space within the outer shaft 18. Note that FIG. 4 shows a state in which fluid is supplied to the inside of the balloon 20 and the balloon 20 is inflated.

Further, a balloon branch connector 10 is attached to the proximal end side of the shaft 14. This balloon branch connector 10 is made of a hard material such as synthetic resin, and the proximal end side of the shaft 14 having a double tube structure is inserted into the shaft fixing part 31 which is cylindrical and extends linearly. It is fixed.

The balloon branch connector 10 is provided with a cylindrical guide wire connector part 32 and a balloon connector part 34 on the right side opposite to the left side in FIG. 4 where the shaft fixing part 31 is provided. There is.

Both the guide wire connector section 32 and the balloon connector section 34 have an internal passage that communicates with the internal passage of the shaft fixing section 31. Each internal passage of the shaft fixing part 31 and the guide wire connector part 32 extends linearly and continuously, and an internal passage of the balloon connector part 34 is provided by branching from the middle of the internal passage of the shaft fixing part 31. and extends diagonally to the upper right in FIG. Note that the intersecting angle of the internal passage of the balloon connector part 34 with the internal passage of the guide wire connector part 32 is an acute angle, approximately 30 to 60 degrees.

Further, a first step 36 is formed in the internal passage of the linearly continuous shaft fixing part 31 and guide wire connector part 32 at a position a predetermined distance from the open end of the shaft fixing part 31. At the same time, a second step 37 is formed at a position further toward the guide wire connector section 32 side. Due to the first step 36 and the second step 37, the diameter of the internal passage gradually decreases from the shaft fixing part 31 to the guide wire connector part 32. Note that the second step 37 includes a tapered portion.

The proximal end of the outer shaft 18, which is fitted into the internal passage from the open end of the shaft fixing portion 31, is positioned by abutting against the first step 36. Further, the proximal end of the inner shaft 16 is further inserted into the internal passage beyond the first step 36, and is positioned by abutting the second step 37. Further, a branch point to the balloon connector section 34 in the internal passage of the shaft fixing section 31 is provided between the first step 36 and the second step 37.

As a result, the internal lumen of the inner shaft 16 is fluid-tightly communicated with the inner hole 38 of the guidewire connector section 32, forming a guidewire lumen 26 whose proximal end side is opened in the guidewire connector section 32. . That is, a connecting connector provided on the proximal end side of the guide wire tube (inner shaft 16) is constituted by the guide wire connector section 32. Further, the internal lumen formed between the outer shaft 18 and the inner shaft 16 in the radial direction is fluid-tightly communicated with the inner hole 40 of the balloon connector section 34, and is opened on the proximal side of the balloon connector section 34. The balloon lumen is 22. Note that fluid tightness is ensured between the guidewire lumen 26 and the balloon lumen 22, and the guidewire connector portion 32 communicates with the guidewire lumen 26 and the balloon connector portion communicates with the balloon lumen 22. 34 are out of communication with each other.

In addition, the balloon branch connector 10 of the present embodiment is provided in a plane direction including each center axis of both the connector parts 32 and 34 so as to connect the guide wire connector part 32 and the balloon connector part 34. A connecting portion 42 in the form of a plate that expands is provided. The plate-shaped connecting portion 42 extends beyond the space between the guide wire connector portion 32 and the balloon connector portion 34 to the outside of each of the connector portions 32 and 34. The connecting portion 42 is provided on the balloon branch connector 10 and the overall shape is generally flat, making it easy to grasp with fingers, and connecting the guide wire connector portion 32 and the balloon connector portion 34 to the outside. Work such as attaching and detaching the flow path is easy.

The shaft fixing part 31 has a small diameter cylindrical shape and protrudes from the connecting part 42 so that it does not get in the way when the connecting part 42 is gripped. The protruding tip portion of the shaft fixing portion 31 has a tapered outer circumferential surface 44 that tapers toward the tip side (left side in FIGS. 1 and 4), and the proximal end of the tapered outer circumferential surface 44. An annular locking groove 46 is formed therein. The proximal end of the protective sleeve 50 that is fitted onto the proximal end side of the shaft 14 is fitted onto the tapered outer circumferential surface 44 and is fitted and fixed in the locking groove 46 , and the proximal end of the protective sleeve 50 is fitted onto the proximal end side of the shaft 14 . A portion of the shaft 14 extending from the shaft fixing portion 31 is held and protected by the protruding flexible protective sleeve 50 .

On the other hand, the aforementioned balloon connector section 34 provided in the balloon branch connector 10 has an inner and outer diameter gradually increasing toward the proximal opening, protrudes cylindrically from the connecting section 42, and has a locking mechanism. Or it is a luer connection without a lock. This makes it possible to supply and discharge fluid from the balloon lumen 22 to the balloon 20 by connecting a syringe or the like to the opening of the balloon connector 34, as shown by the imaginary line in FIG. ing.

In addition, the aforementioned guidewire connector section 32 provided in the balloon branch connector 10 has an inner and outer diameter gradually increasing toward the opening at the proximal portion protruding from the connecting section 42 in a cylindrical shape. A housing cylindrical portion 54 is provided that extends substantially straight through the tapered cylindrical portion 52 . An elastic sealing member 56 that can be elastically deformed is housed in the accommodating cylindrical portion 54 , and a fixing pressing member 58 is assembled to the proximal opening of the accommodating cylindrical portion 54 .

The elastic seal member 56 has a generally annular or cylindrical shape as a whole, and is made of an elastic material such as rubber or elastomer. The elastic sealing member 56 has an outer circumferential surface that extends along the inner circumferential surfaces of the tapered cylindrical portion 52 and the housing cylindrical portion 54 and substantially overlaps them. A circular insertion hole 59 passing through the center of the elastic seal member 56 in the axial direction communicates with the inner hole 38 of the guide wire connector section 32 on substantially the same central axis.

The fixing pressing member 58 has a substantially cylindrical main body part 60 having an inner hole communicating with the guide wire lumen 26 and the insertion hole 59, and the distal end side of the main body part 60 is connected to the housing cylinder part 54. An external flow path such as a syringe with or without a lock is connected to the proximal end side of the main body part 60 which is a pressing part 61 that is inserted into the housing cylinder part 54 and protrudes outward from the housing cylinder part 54. obtain. That is, in this embodiment, the fixing press member 58 and the external connection Luer taper member are integrally formed, and the Luer taper member is constituted by the fixing press member 58. In addition, as an aspect different from this embodiment, when the fixing pressing member and the Luer taper member are separate bodies and are arranged coaxially in the axial direction on the proximal end side of the elastic sealing member, for example, the most The member located on the distal end side that directly applies a pressing force to the elastic sealing member is understood as the fixing pressing member, and the member located on the most proximal end side that can be connected to the external flow path is understood as the fixing pressing member. It is understood to be a luer taper member.

Further, the fixing pressing member 58 has a rotation operation portion 64 on the outer peripheral portion. The rotary operation part 64 has a substantially cylindrical shape with a larger diameter than the main body part 60, and is provided so as to be separated from the pressing part 61 of the main body part 60 in the radial direction so as to cover it from the outside. There is. The rotation operation section 64 is integrally connected to the axially intermediate portion of the main body section 60 at the proximal end.

The rotation operation part 64 of the fixing pressing member 58 is placed outside the housing cylinder part 54 of the guide wire connector part 32. Here, a male thread 66 is formed on the outer circumferential surface of the housing cylinder part 54, while a female thread 68 is formed on the inner circumferential surface of the rotation operation part 64. These male screws 66 and female screws 68 are screwed together to form a screw feeding mechanism, and by rotating the rotary operation section 64 from the outside with your fingers, the fixing pressing member 58 is moved against the housing cylinder section 54. It is adapted to be moved in the axial direction, that is, in the direction toward and away from the elastic seal member 56 by the screw feeding action.

In the fixing pressing member 58, the axially distal end surface of the pressing portion 61 is overlapped with the axially proximal end surface of the elastic sealing member 56. When the fixing pressing member 58 is screwed into the housing cylindrical portion 54 by the screw feeding mechanism, the elastic sealing member 56 is pressed from both sides in the axial direction between the tapered cylindrical portion 52 and the pressing portion 61 (a pressing force is applied). ) is compressed and deformed. As a result, as shown in FIG. 5, the deformation of the elastic seal member 56 such that it swells toward the outer circumference is restricted by the housing cylinder portion 54, so that the elastic seal member 56 deforms so as to swell toward the inner circumference. do. Due to this bulging deformation of the elastic sealing member 56 toward the inner circumference, the inner diameter of the insertion hole 59 is reduced or almost zero.

Therefore, as shown in FIG. 4, by screwing the fixing pressing member 58 into the accommodating cylinder portion 54 while the guide wire 24 is inserted, the elastic seal member 56 can be tightened to the outer peripheral surface of the guide wire 24. Under such conditions, the outer circumferential surface of the elastic seal member 56 is fluid-tightly pressed against the inner circumferential surface of the housing tube 54, and the inner circumferential surface of the elastic seal member 56 is pressed through the Luer taper member (fixing pressing member) 58. The guide wire 24 can be fluid-tightly fixed in the guide wire connector section 32 by being fluid-tightly tightened to the outer peripheral surface of the guide wire 24 inserted into the guide wire lumen 26 . That is, in this embodiment, a guide wire fixing mechanism is configured including the elastic seal member 56 and the fixing pressing member 58.

Note that a pressing protrusion 74 that slightly protrudes in the axial direction at a radially intermediate portion is provided on the end surface of the distal end side of the pressing portion 61 in the fixing pressing member 58. In particular, in this embodiment, the pressing protrusion 74 has a substantially regular hexagonal shape extending in the circumferential direction with a predetermined width dimension when viewed from the front in the axial direction. On the other hand, the proximal end surface 76 of the elastic seal member 56 is a substantially flat annular surface in an uncompressed state before assembly.

The radial width dimension Rb of the distal end surface 78 of the pressing protrusion 74 in the fixing pressing member 58 is relative to the radial width dimension Ra (see FIG. 3) of the proximal end surface 76 of the elastic sealing member 56. (see FIG. 3) is smaller. Further, the pressing protrusion 74 is overlapped and pressed against the radially intermediate portion of the elastic seal member 56. Thus, in this embodiment, the proximal end surface 76 of the elastic seal member 56 and the distal end surface 78 of the pressing protrusion 74 in the fixing pressing member 58 are abutting surfaces that contact each other. A distal end side end surface 78 of the pressing protrusion 74 is used as a contact surface on the Luer taper member (fixing pressing member) 58 side. Note that when the pressing force of the pressing protrusion 74 increases, the pressing protrusion 74 is pushed into the elastic sealing member 56, and the elastic sealing member 56 moves inside and outside of the pressing protrusion 74 with respect to the axial end surface of the pressing part 61. It comes into contact over a wide area located on both sides of the circumference.

In this way, in the pressing portion 61 of the fixing pressing member 58, the initial contact surface with the elastic sealing member 56 is the distal end side end surface 78 of the pressing protrusion 74 that has a polygonal shape and partially projects. As a result, based on the concentrated action of contact stress and strain on the corners, the sealing performance at the contact surface between the pressing portion 61 and the elastic seal member 56 is improved.

Further, as shown in FIG. 3, on the outer circumferential surface of the housing cylinder portion 54, a locking protrusion 80 is provided on the outer circumferential surface of the housing cylinder portion 54, and is located on the distal side of the male thread 66 and has a larger diameter than the male thread and extends in the circumferential direction. It is installed protrudingly. On the other hand, the rotation operation part 64 is provided with a ring-shaped locking part 82 located at an end distal to the female thread 68 and having an inner diameter smaller than the outer diameter of the locking protrusion 80 .

When the fixing pressing member 58 is attached to the guide wire connector section 32, the ring-shaped locking portion of the rotation operation section 64 is rotated in the direction in which the female thread 68 of the rotation operation section 64 is screwed into the male screw 66 of the housing cylinder section 54. 82 is located on the distal side of the locking protrusion 80 of the housing cylinder portion 54. In addition, in the housing cylinder part 54, the outer circumferential surface on the distal side of the locking protrusion 80 has an outer diameter slightly smaller than the inner diameter of the ring-shaped locking part 82 of the rotation operation part 64. The stop portions 82 are extrapolated so as to overlap. When the rotary operation section 64 is rotated in the direction in which the rotation operation section 64 is detached from the housing cylinder section 54 (the direction in which the rotation operation section 64 is loosened) by the screw feeding action of the female and male screws 68 and 66, the ring-shaped engagement occurs. When the stop portion 82 comes into contact with the locking protrusion 80, the end of movement of the rotary operation portion 64 in the detachment direction from the housing cylinder portion 54 is defined.

Note that a plurality of through holes 84 are formed at a predetermined distance in the circumferential direction between a portion of the rotation operation portion 64 where the female thread 68 is formed and the ring-shaped locking portion 82. The inner peripheral surface of this through hole 84 is used to form a locking surface for the locking protrusion 80 in the ring-shaped locking portion 82 . Of course, the locking surface for the locking protrusion 80 is not limited to the inner circumferential surface of the through hole 84. For example, a bottomed recess may be formed on the inner circumferential surface of the rotary operation part 64, and The locking surface for the locking protrusion 80 may be configured by the inner circumferential surface of the locking projection 80 .

Incidentally, FIGS. 1 to 3 show a state in which the rotary operation part 64 has been moved to the end of movement in the detachment direction (rightward in FIG. 3) with respect to the housing cylinder part 54 by the screw feeding mechanism. Even in this state, the distal end surface 78 of the pressing portion 61 of the fixing pressing member 58 is kept in contact with the proximal end surface 76 of the elastic sealing member 56 . Therefore, in the guide wire connector section 32, even when the fixing pressing member 58 assembled with the screw feeding mechanism is located at the most proximal side and the pressing force against the elastic seal member 56 is minimized, the elastic seal A liquid-tight state between the member 56 and the fixing pressing member (luer taper member) 58 is maintained. As a result, the guide wire connector section 32 has a fixing pressing member ( A tubular flow path is formed over the entire length up to the proximal opening of the luer taper member) 58, and the guide wire lumen 26, the insertion hole 59, and the luer taper member (fixing pressing member) 58 are communicated with each other. There is.

According to the balloon branch connector 10 of the present embodiment having the above-described structure, the guide wire connector portion 32 is provided in a single connector portion that is easy to grasp at the proximal end portion of the above-described over-the-wire type balloon catheter. and a balloon connector section 34 can be provided. Both the guide wire connector section 32 and the balloon connector section 34 have a connection section with a Luer taper structure on the proximal end side of each lumen 26, 22, making it easy to connect an external flow path such as a syringe. can do.

In particular, in the guide wire connector section 32, the inserted guide wire 24 can be easily fixed/released by rotating the fixing pressing member 58 and adjusting the pressing force on the elastic sealing member 56. . Therefore, for example, by tightening the fixing pressing member 58 to fix the guide wire 24 with the guide wire 24 slightly protruding from the tip of the guide wire lumen 26, the toughness of the guide wire 24 can be utilized. Balloon 20 can be delivered to the intended treatment site.

Furthermore, even when the fixing pressing member 58 is located at the most proximal side, liquid tightness between the elastic sealing member 56 communicating with the guide wire lumen 26 and the fixing pressing member (luer taper member) 58 is ensured. Therefore, for example, when introducing a contrast medium or a drug solution, injecting a lubricant, or priming operation through the guidewire lumen 26, the guidewire must be pulled out from the guidewire lumen 26 as shown in FIG. In this state, it becomes possible to connect and operate a syringe or the like to the fixing pressing member (luer taper member) 58. As a result, it becomes possible to stably perform various operations through the guide wire lumen 26, and the labor burden on the operator can be reduced.

Next, in FIGS. 6 to 8, a balloon branch connector 90 according to a second embodiment of the present invention is shown in a state where the pressing force on the elastic seal member 56 is minimized. The basic structure of the balloon branch connector 90 of this embodiment is the same as that of the first embodiment, except that the structure of the fixing pressing member 92 is different from the fixing pressing member 58 of the first embodiment. has been done. In this embodiment, members and parts that are substantially the same as those in the first embodiment are designated by the same reference numerals as in the first embodiment in the drawings, and detailed explanation thereof will be omitted.

The fixing pressing member 92 of this embodiment has a substantially cylindrical main body portion 60 extending in the axial direction as in the first embodiment, and an external flow path is connected to the proximal end of the main body portion 60. connection is possible. Accordingly, also in this embodiment, the luer taper member is constituted by the fixing pressing member 92. On the other hand, in this embodiment, the main body section 60 is provided with a rotation operation section 94 that is a separate component.

Similar to the rotation operation section 64 of the first embodiment, the rotation operation section 94 is arranged in a spaced-apart manner on the outer circumference side of the pressing section 61, and has a guide wire connector section on the inner circumference. It has a female thread 68 that is screwed into the male thread 66 of the housing cylinder part 54 of 32. The proximal end portion of the rotational operation portion 94 of this embodiment has a reduced diameter in the shape of an inner flange, and is a fitting portion 95 that is rotatably fitted to the outer circumferential surface of the main body portion 60.

A fitting groove 96 is formed in the outer circumferential surface of the main body portion 60 and extends in the circumferential direction in the axially intermediate portion, and the fitting portion 95 of the rotation operation portion 94 is assembled into the fitting groove 96. movement in the axial direction is restricted. That is, the fitting portion 95 is fitted between annular protrusions 96a and 96b that form a fitting groove 96 and are spaced apart from each other in the axial direction. As a result, the fitting portion 95 is assembled so as to be rotatable within the fitting groove 96 and cannot be removed from the fitting groove 96 in the axial direction. As a result, the rotation operation section 94 and the luer taper member (fixing pressing member) 92 can rotate relative to each other.

Moreover, at least one (in this embodiment, a plurality of positioning convex parts spaced apart in the circumferential direction) protrudingly provided on the outer circumferential surface of the main body part 60 of the fixing pressing member 92 extends in the axial direction. On the other hand, a positioning recess 98 extending in the axial direction is formed on the inner circumferential surface of the accommodating cylinder part 54 of the guide wire connector part 32 at a position corresponding to the positioning convex part 97 . The positioning convex portion 97 and the positioning concave portion 98 are fitted in a concave-convex manner, and the fixing pressing member 92 and the housing cylinder portion 54 are allowed to move relative to each other in the axial direction while preventing relative rotation around the central axis. has been done.

The balloon branch connector 90 of this embodiment not only exhibits the same effects as the first embodiment, but also allows the rotation operation section 94 that constitutes the screw feeding mechanism to be operated without rotating the main body section 60. It becomes possible to adjust the compressive force exerted on the elastic seal member 56 by rotating it. Thereby, as shown in FIG. 9, the guide wire 24 can be tightened and fixed by the elastic seal member 56 by rotating the rotation operation section 94. Therefore, even when the rotary operation section 94 is rotated, sliding of the abutting surface of the pressing section 61 against the elastic seal member 56 is avoided, and the operational resistance accompanying the sliding is reduced, and the sealing on the abutting surface is avoided. further improvement in performance can be achieved.

In addition, when connecting or removing a syringe or the like while rotating it around the central axis with respect to the luer taper member (fixing press member) 92, when the syringe or the like and the luer taper member (fixing press member) 92 rotate together, However, the rotational force is prevented from being applied to the rotational operation section 64. Therefore, it is possible to prevent the insertion hole 59 in the elastic seal member 56 from being opened or closed due to unintentional rotation of the rotary operation portion 64.

Although the embodiments of the present invention have been described above, the present invention is not to be construed as being limited by the specific descriptions in such embodiments, and various changes, modifications, improvements, etc. can be made based on the knowledge of those skilled in the art. It can be implemented in a manner in which the following is added.

For example, the fixing mechanism for fixing the guide wire within the guide wire lumen is not limited. For example, in addition to the structure in which the fixing pressing member is pressed against the elastic sealing member using the screw feeding mechanism as in the embodiment described above, a fixing pressing member that is positioned by frictional force due to press-fitting to the housing cylinder of the guide wire connector part is adopted. However, the compression force applied to the elastic sealing member 56 may be adjusted by simply pushing or pulling the fixing pressing member into the housing cylinder and moving it in the axial direction.

Furthermore, in the embodiment described above, the fixing pressing member 58 and the Luer taper member are formed integrally, but the fixing pressing member and the Luer taper member may be formed separately and fixed afterwards or configured as separate parts. good. The luer taper member is provided with a rotation operation section, and by rotating the rotation operation section and moving the fixation pressing member toward the distal end side together with the luer taper member, the elastic seal member is compressed by the fixation press member and guided. The wire may be clamped and fixed. Of course, in the case where the fixing pressing member and the Luer taper member are separate bodies, the fixing pressing member and the Luer taper member are not limited to an aspect in which they are coaxially arranged adjacent to each other in the axial direction. For example, the fixing press member may be disposed on the outer circumferential surface of the elastic seal member in such a manner that it protrudes radially outward from the housing tube of the guidewire connector, and the fixing press member may be disposed radially inwardly. By moving the guide wire, the elastic seal member may be compressed from the side and the guide wire may be tightened and fixed. The fixing pressing member may be moved toward the elastic sealing member by, for example, directly pushing the fixing pressing member, or by providing a threaded portion between the housing cylinder portion and the fixing pressing member to be screwed together. , the fixing pressing member may be moved inward in the radial direction of the accommodating cylindrical portion by screw feeding. In this case, the elastic seal member and the luer taper member are arranged adjacent to each other in the axial direction without intervening the fixing pressing member and are in direct contact with each other, with the luer taper member side being in contact with the proximal end side end surface of the elastic seal member. The contact surface may be defined by the distal end surface of the Luer taper member. Even when the pressing force on the elastic seal member is minimized, the gap between the elastic seal member and the luer taper member is maintained in a liquid-tight state, thereby preventing unintentional leakage of fluid from the guidewire lumen. obtain.

In addition, in the above embodiment, a balloon catheter having a balloon lumen and a guide wire lumen is illustrated, but the connection connector according to the present invention is also applicable to a single lumen type catheter having a guide wire lumen through which a guide wire is inserted. A balloon lumen is not required. That is, in the connection connector according to the present invention, the balloon connector portion and the balloon branch connector are not essential. Even when a balloon connector section and a guide wire connector section are provided, the connection connector according to the present invention is provided independently from the balloon connector section, as in, for example, Japanese Patent Application Laid-Open No. 2002-143311. It is also possible to apply the present invention to a guide wire connector section.

Furthermore, in the embodiment described above, the distal end of the guide wire 24 slightly protrudes toward the distal end side from the distal tip 28, but the distal end of the distal tip is occluded and the distal end of the guide wire 24 is slightly protruded from the distal tip 28. It does not need to protrude from the top.

Further, the guide wire in the present invention is inserted into a shaft or catheter provided with a lumen to assist insertion into the lumen.For example, a stylet or the like has a similar function, and by applying the present invention, Any guidewire that achieves similar technical effects is included in the scope of the guidewire of the present invention.

In addition, the locking protrusion or locking portion that defines the moving end of the rotary operation portion of the fixing pressing member relative to the housing cylinder portion of the guide wire connector portion may have a specific structure as long as it functions to define the moving end. is not limited to this, and may be formed by, for example, partially provided recesses or protrusions in the circumferential direction.
Furthermore, the present invention originally includes each of the inventions described in (i) to (ix) below, and additional notes will be made regarding their configurations and effects.
The present invention
(i) A connecting connector provided on the proximal end side of the guidewire tube, comprising an elastic sealing member having an insertion hole communicating with the guidewire lumen of the guidewire tube, and an elastic sealing member that connects the guidewire lumen with the insertion hole. A luer taper member for external connection that communicates with the hole and a fixing pressing member that applies a pressing force to the elastic seal member to tighten and fix the guide wire are provided. Even when the pressing force is minimized, the communication state between the guide wire lumen, the insertion hole, and the luer taper member is maintained while maintaining a fluid-tight state between the elastic seal member and the luer taper member. connector for
(ii) The fixing pressing member is located on the distal end side of the Luer taper member and is configured integrally with the Luer taper member, and the distal end side end surface of the fixing pressing member is connected to the elastic sealing member. The connection connector according to (i), which comes into contact with the proximal end side end surface of the
(iii) a contact surface on the luer taper member side that is in contact with the proximal end side end surface of the elastic seal member and maintains a liquid-tight state between the elastic seal member and the luer taper member; The connection connector according to (i) or (ii), which has a smaller radial width dimension than the proximal end side end surface ;
(iv) the connection connector according to (iii), wherein the contact surface has a substantially polygonal shape;
(v) The fixing pressing member is assembled so as to be movable toward and away from the elastic sealing member by a screw feeding mechanism, and the fixing pressing member is moved in a direction away from the elastic sealing member by the screw feeding mechanism. Any one of (i) to (iv) in which the liquid-tight state between the elastic seal member and the luer taper member is maintained by being brought into contact with the elastic seal member even at the end of the movement. Connector for connection described in section,
(vi) The connection connector according to (v), wherein the rotation operation part constituting the screw feeding mechanism is a separate component from the Luer taper member and is rotatable relative to the Luer taper member;
(vii) A locking protrusion that defines a moving end of the rotary operation section in the loosening direction is provided at the mounting portion of the rotation operation section, so that the fixing pressing member is separated from the elastic sealing member in the direction of separation. The connecting connector according to (vi), wherein the moving end to the
(viii) A balloon branch connector provided on the proximal end side of a shaft having a balloon through which a guide wire tube is inserted on the distal end side, the balloon connector communicating with the balloon lumen for the balloon. and a guidewire connector part that communicates with the guidewire lumen of the guidewire tube are provided so as not to communicate with each other, and the guidewire connector part includes a luer taper member for external connection and a guidewire connector part that communicates with the guidewire lumen of the guidewire tube. a branch connector for a balloon, which is provided with a fixing mechanism for fixing a guide wire inserted into the guide wire lumen through a luer taper member;
(ix) The branch connector for a balloon according to (viii), comprising the connecting connector according to any one of (i) to (vii) as the guide wire connector part;
Including inventions related to.
In the invention described in (i) above, since the luer taper member for external connection is provided, a syringe or the like can be connected even when the connection connector is attached to the catheter or the like. Further, even when the pressing force applied to the elastic seal member by the fixing pressing member is minimized, the liquid-tight state between the elastic seal member and the luer taper member is maintained. Therefore, when the guide wire is not fixed, fluid introduced into the body from a syringe or the like can be prevented from unintentionally leaking out through the gap between the elastic sealing member and the fixing pressing member or the luer taper member. In addition, when the elastic seal member and the luer taper member are disposed adjacent to each other in the axial direction, it is sufficient that the liquid-tight state between the elastic seal member and the luer taper member is maintained. In addition, when a fixing press member is placed between the elastic seal member and the luer taper member in the axial direction, by maintaining a liquid-tight state between the elastic seal member and the fixing press member, the elastic A liquid-tight state between the seal member and the luer taper member can be maintained.
The invention described in (ii) above not only reduces the number of parts, but also prevents fluid from leaking into the external space through the gap that may occur when the fixing pressing member and the luer taper member are formed separately. can be avoided.
In the invention described in (iii) above, the fixing press member and the luer taper member located on the proximal end side of the elastic seal member are pressed so as to bite into the elastic seal member, so that the fixing press member and the luer taper member are pressed so as to bite into the elastic seal member. A more reliable seal between the elastic seal member and the elastic seal member is achieved.
In the invention described in (iv) above, each corner of the abutment surface on the Luer taper member side having a substantially polygonal shape easily bites into the elastic sealing member. It is possible to improve the sealing performance between the abutting surfaces. Note that, for the purpose of improving sealing performance due to corner biting, etc., the contact surface on the Luer taper member side is preferably in a polygonal shape having six or more corners.
In the invention described in (v) above, by employing the screw feeding mechanism, the fixing pressing member can move toward and away from the elastic sealing member, that is, the guide wire can be switched between the fixed state and the non-fixed state. can be easily achieved. In addition, in this aspect, by positioning the fixing pressing member by the screw feeding mechanism at the end of movement in the direction of separation from the elastic sealing member, "the pressing force against the elastic sealing member is minimized" in the aspect (i) above. A state in which the
In the invention described in (vi) above, the rotational resistance of the rotational operation section is suppressed by rotating the rotational operation section relative to the luer taper member. As a result, the rotational resistance of the rotary operation part is reduced, and sliding due to relative rotation of the abutting surfaces of the elastic seal member and the fixing press member is also suppressed, so that the fixing press member contacts the elastic seal member. The stability of the biting portion can be improved, and the stability of the sealing performance can also be improved. In particular, by combining with the aspect (iv) above, it becomes possible to more stably improve the sealing performance by biting into the elastic sealing member at each corner of the polygonal fixing pressing part. In addition, since the rotation operation part and the luer taper member rotate relative to each other, when a syringe, etc. is connected to or removed from the luer taper member while rotating around the central axis, the syringe, etc. and the luer taper member rotate together, and the rotation is applied to the rotary operation section, and furthermore, due to the rotation of the rotation operation section, the fixing pressing member moves toward or away from the elastic seal member, and the insertion hole of the elastic seal member is unintentionally blocked or opened. This can be prevented from occurring.
In the invention described in (vii) above, it is possible to prevent the fixing press member from falling off when the fixing press member moves in a direction away from the elastic seal member. Furthermore, the state of contact (seal) between the elastic seal member and the fixing press member can be maintained with a simple structure that only defines the moving end of the fixing press member.
In the invention described in (viii) above, both the balloon connector part and the guidewire connector part are integrally provided with a single connector structure. Therefore, when operating either the balloon or the guide wire, the shaft of the other does not hang down and become an obstacle. In addition, since a luer connection part such as a syringe for injecting fluid from the outside can be directly connected to the luer taper member through which the guide wire is inserted, it is easy to inject lubricating fluid into the guide wire. Become. Furthermore, since the guide wire fixing mechanism is provided, it is possible to avoid the risk of the guide wire unintentionally protruding ahead when inserting the balloon catheter into the lumen.
In the invention described in (ix) above, it is possible to stably ensure the sealing performance of the guidewire connector portion of the balloon branch connector. That is, when the guidewire is not fixed, liquid tightness between the elastic sealing member and the luer taper member in the guidewire connector part (connection connector) is ensured, and unintended fluid is prevented, for example, when injecting fluid from the outside. Leakage can be prevented.

10 Balloon branch connector 12 Balloon catheter 14 Shaft 16 Inner shaft (guide wire tube)
18 Outer shaft 20 Balloon 22 Balloon lumen 24 Guide wire 26 Guide wire lumen 28 Distal tip 30 Contrast marker 31 Shaft fixing part 32 Guide wire connector part (connector for connection)
34 Balloon connector section 36 First step 37 Second step 38 Inner hole 40 (of the guide wire connector section) Inner hole 42 (of the balloon connector section) Connecting section 44 Tapered outer peripheral surface 46 Locking groove 50 Protection Sleeve 52 Tapered cylindrical portion 54 Housing cylindrical portion 56 Elastic sealing member 58 Fixing pressing member (Luer taper member)
59 Insertion hole 60 Body part 61 Pressing part 64 Rotating operation part 66 Male thread 68 Female thread 74 Pressing protrusion 76 Proximal end side end surface 78 Distal end side end surface (luer taper member side contact surface)
80 Locking protrusion 82 Ring-shaped locking part 84 Through hole 90 Branch connector for balloon 92 Fixing press member (Luer taper member)
94 Rotation operation part 95 Fitting part 96 Fitting groove 96a, 96b Annular protrusion 97 Positioning convex part 98 Positioning recess

Claims (8)

A connection connector provided on the proximal end side of the guidewire tube,
an elastic sealing member having an insertion hole communicating with the guidewire lumen of the guidewire tube;
a luer taper member for external connection that communicates with the guide wire lumen and the insertion hole;
A fixing pressing member is provided that applies a pressing force to the elastic sealing member to tighten and fix the guide wire,
Even when the pressing force on the elastic seal member is minimized, the communication state between the guide wire lumen, the insertion hole, and the luer taper member maintains a fluid-tight state between the elastic seal member and the luer taper member. It is now being maintained,
The fixing pressing member is assembled so as to be movable toward and away from the elastic sealing member,
By bringing the fixing pressing member into contact with the elastic seal member even at the end of movement in the direction of separation from the elastic seal member, a liquid-tight state between the elastic seal member and the luer taper member is maintained. Connector for connection. The fixing pressing member is located on the distal end side of the Luer taper member and is configured integrally with the Luer taper member, and the distal end side end surface of the fixing pressing member is located proximal to the elastic sealing member. The connecting connector according to claim 1, which abuts against the end side end surface. A contact surface on the luer taper member side that comes into contact with the end surface on the proximal end side of the elastic seal member to maintain a liquid-tight state between the elastic seal member and the luer taper member is the proximal end of the elastic seal member. The connector according to claim 1 or 2, having a smaller radial width dimension than the side end surface. The connector according to claim 3, wherein the contact surface has a substantially polygonal shape. The fixing pressing member is assembled so as to be movable toward and away from the elastic sealing member by a screw feeding mechanism,
By bringing the fixing pressing member into contact with the elastic seal member even at the end of movement in the direction of separation from the elastic seal member by the screw feeding mechanism, the gap between the elastic seal member and the luer taper member is reduced. The connector according to any one of claims 1 to 4, wherein a liquid-tight state is maintained. 6. The connector according to claim 5, wherein the rotational operation part constituting the screw feeding mechanism is a separate component from the luer taper member and is rotatable relative to the luer taper member. By providing a locking protrusion that defines the end of movement of the rotary operation section in the loosening direction at the mounting portion of the rotation operation section, the fixing pressing member can be moved in the direction of separation from the elastic sealing member. 7. The connecting connector according to claim 6, wherein the end is defined. A branch connector for a balloon provided on the proximal end side of a shaft, the balloon having a guide wire tube inserted therethrough provided on the distal end side,
A balloon connector portion that communicates with the balloon lumen of the balloon and a guidewire connector portion that communicates with the guidewire lumen of the guidewire tube are provided so as not to communicate with each other,
The guide wire connector portion is provided with a luer taper member for external connection and a fixing mechanism for fixing a guide wire inserted into the guide wire lumen through the luer taper member, and A branch connector for a balloon , comprising the connection connector according to any one of the above as the guide wire connector section .

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