JP2014128353A - Catheter hub - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter hub which, when a guide wire with a bent tip is inserted from an opening of a proximal end of a hub of a catheter, enables the tip of the guide wire to be smoothly inserted into a lumen of a shaft of the catheter.SOLUTION: A catheter hub 14 includes: a shaft holding part 28 for holding the proximal end of a shaft 12; and a hub lumen forming part 34 which is provided on the proximal end side of the shaft holding part 28 and forms a hub lumen 24 communicated with a lumen of the shaft 12. The hub lumen forming part 34 has an asymmetrical guide part 38 which is decreased in inside diameter as it goes toward the tip direction at least in a part in the direction of an axis of the catheter hub 14 and which has an axis b inclined to the axis of the catheter hub 14.

Description

  The present invention relates to a catheter hub provided at a proximal end of a shaft in a catheter.

  2. Description of the Related Art Conventionally, it has been widely performed to introduce a catheter into a living organ such as a blood vessel to inspect and treat a lesioned part (for example, a stenosis) in the living organ. This type of catheter generally has a long shaft constituting the catheter body and a hub (catheter hub) connected to the proximal end of the shaft (see, for example, Patent Document 1 below).

  In using such a catheter, in order to reach the distal end of the catheter to a target site in the living body, it is necessary to advance the shaft selectively in a complexly branched blood vessel or body cavity. For this reason, usually, a guide wire is inserted through the lumen of the catheter, and the catheter is caused to travel along the guide wire in the blood vessel or body cavity with the tip of the guide wire preceding the tip of the catheter. .

US Pat. No. 6,355,027

  By the way, in order to select a blood vessel and control the direction of the distal end of a catheter, the guide wire may be used by bending one end or a plurality of portions of the distal end in advance (with an angle). When the guide wire having the angled tip is inserted into the catheter from the proximal end opening of the catheter hub, the most distal end of the guide wire comes into contact with a part of the inner peripheral surface of the hub. The guide wire advances with respect to the hub while the other part of the guide wire contacts the inner peripheral surface of the hub opposite to the hub. In this case, since the conventional hub is provided with a taper in which the inner diameter decreases at a constant rate toward the distal end, the inner diameter decreases toward the distal end. The frictional resistance with the peripheral surface is also increased. For this reason, the movement of the guide wire is prevented on the inner peripheral surface of the hub, and it may be difficult to move the guide wire further to the distal end side.

  The present invention has been made in consideration of such problems, and when a guide wire having a bent distal end is inserted from the proximal end opening of the catheter hub, the movement resistance of the distal end portion of the guide wire with respect to the catheter hub is reduced. Thus, an object of the present invention is to provide a catheter hub that can smoothly insert the distal end of the guide wire into the lumen of the catheter shaft.

  To achieve the above object, the present invention forms a shaft holding portion for holding the proximal end of a catheter shaft, and a hub lumen provided on the proximal end side of the shaft holding portion and communicating with the lumen of the shaft. A hub portion for forming a hub lumen, wherein the hub lumen formation portion has an inner diameter that decreases in a distal direction in at least a part of the catheter hub in an axial direction and An asymmetric guide portion having an axis inclined with respect to the axis is provided.

  According to the above configuration, when a guide wire having a bent distal end portion is inserted from the proximal end side of the catheter hub, the guide wire is inserted into a portion of the asymmetric guide portion whose inclination angle with respect to the axis of the catheter hub is relatively small. When the tip part (the most advanced part or the bent part) is brought into contact, the friction resistance between the tip part of the guide wire and the inner peripheral surface of the hub at the contact point is suppressed, so that the guide wire tip part easily moves in the tip direction. Become. Therefore, the guide wire can be smoothly inserted into the shaft without being blocked by the inner peripheral surface of the hub.

  In the catheter hub, the asymmetric guide portion includes a first guide portion constituting a part of a circumferential direction in the asymmetric guide portion, and a side opposite to the first guide portion with respect to the axis of the catheter hub. A second guide portion that constitutes a portion, and an inclination angle of the catheter hub with respect to the axis is smaller than an inclination angle of the first guide portion with respect to the axis of the catheter hub.

  According to said structure, the inclination angle of a 1st guide part is relatively large, and the inclination angle of the 2nd guide part on the opposite side is relatively small. Therefore, when a guide wire with a bent distal end is inserted from the proximal end side of the catheter hub, the distal end portion of the guide wire is brought into contact with the relatively smaller second guide portion. The guide wire can be smoothly moved in the distal direction in the hub while the frictional resistance with the inner peripheral surface of the hub is small.

  In the catheter hub, the hub lumen forming portion has a taper formed over a predetermined range in an axial direction from a proximal end opening of the catheter hub, and the asymmetric guide portion is connected to a distal end of the taper. May be formed.

  According to the above configuration, when a guide wire having a bent distal end portion is inserted from the proximal end side of the catheter hub, the guide wire reaches the asymmetric guide portion when the distal end portion of the guide wire exceeds the taper. The friction resistance between the distal end portion of the guide wire and the inner peripheral surface of the hub can be suppressed at a relatively early stage after the start of insertion, and the guide wire can be inserted more effectively.

  In the catheter hub, the hub lumen forming portion includes a taper formed over a predetermined range in an axial direction from a proximal end opening of the catheter hub, and an intermediate taper portion formed on a distal end side than the taper. The asymmetric guide part may be provided on the tip side of the taper via the intermediate taper part.

  According to the above configuration, the frictional resistance between the distal end portion of the guide wire and the inner peripheral surface of the hub can be effectively suppressed on the distal end side of the hub lumen forming portion where the pushing force of the guide wire from the proximal side is hardly transmitted. .

  According to the catheter hub of the present invention, when a guide wire having a bent tip is inserted from the proximal end opening of the catheter hub, the distal end of the guide wire is reduced by reducing the movement resistance of the tip of the guide wire relative to the hub. Can be smoothly inserted into the lumen of the catheter shaft.

It is a partially omitted side view of a catheter provided with a catheter hub according to an embodiment of the present invention. FIG. 2 is a partially omitted longitudinal sectional view of the catheter hub shown in FIG. 1. FIG. 3A is a first diagram illustrating an operation of inserting a guide wire from the proximal end side of the catheter hub, and FIG. 3B is a second diagram illustrating an operation of inserting the guide wire from the proximal end side of the catheter hub. FIG. It is a partially omitted vertical sectional view of a catheter hub according to a modification of the present invention. 5A is a diagram for explaining the operation of the catheter hub shown in FIG. 4, and FIG. 5B is another diagram for explaining the operation of the catheter hub shown in FIG. 4.

  Hereinafter, preferred embodiments of the catheter hub according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a partially omitted side view of a catheter 10 including a catheter hub 14 (hereinafter referred to as “hub 14”) according to an embodiment of the present invention. The catheter 10 is inserted into a blood vessel or body cavity so that the tip reaches a target site, and is used to inject a therapeutic drug or a diagnostic contrast medium. As shown in FIG. 1, the catheter 10 includes a thin and long shaft 12, a hub 14 connected to the proximal end of the shaft 12, and a strain relief 16 provided at a connection portion of the shaft 12 to the hub 14. With.

  The shaft 12 constitutes a catheter body that is inserted into a living body lumen such as a blood vessel, and has a flexibility in which a lumen 13 (see also FIG. 2) communicating from the distal end to the proximal end is formed. It is a long and thin tubular member. The length of the shaft 12 is, for example, about 500 mm to 2000 mm, and preferably about 1000 mm to 1500 mm.

  The outer diameter of the shaft 12 is, for example, about 0.3 mm to 3 mm, preferably about 0.4 mm to 2 mm. The inner diameter of the shaft 12 is, for example, about 0.2 mm to 2.5 mm, preferably about 0.3 mm to 1.8 mm. The outer diameter and inner diameter of the shaft 12 may be smaller toward the distal end side. The most distal portion of the shaft 12 may have a taper.

  An X-ray opaque marker (contrast marker) 18 is fixed to the outer peripheral surface in the vicinity of the most distal end portion of the shaft 12. The radiopaque marker 18 is formed of a material having radiopacity that is made of gold, platinum, or the like, so that the distal end position of the catheter 10 can be viewed in vivo under radiography. Is.

  The hub 14 is a member having a hollow structure that holds the proximal end of the shaft 12 at its distal end, and other instruments such as a syringe can be connected to the proximal end. The hub 14 can be made of, for example, a hard resin such as polycarbonate, polyethylene, or polypropylene. In the present embodiment, the hub 14 is made of a transparent material (such as polycarbonate). Thereby, when the guide wire 46 (see FIG. 3A and the like) or the like is inserted, the existence of the end portion of the guide wire 46 in the hub 14 can be confirmed, which is preferable.

  The strain relief 16 is for preventing bending (kinking) at the connection portion of the shaft 12 to the hub 14. For example, the strain relief 16 is formed of a resin having moderate flexibility and rigidity formed in a tapered tube shape. It is a member. The strain relief 16 can be made of a material similar to that of the shaft 12.

  Next, a specific configuration of the hub 14 will be described. FIG. 2 is a partially omitted vertical sectional view of the hub 14. As shown in FIG. 2, the hub 14 includes a hollow body portion 20 and a plurality (two in the illustrated example) of blade portions 22 protruding from the outer surface of the body portion 20. The body portion 20 is provided at the base end of the hub 14 and an inner peripheral portion 34 (hereinafter referred to as “hub lumen forming portion 34”) that forms a hub lumen 24 that communicates with the lumen 13 of the shaft 12. A proximal end opening 26.

  Further, a shaft holding portion 28 having a cylindrical inner surface is provided on the distal end side of the hub 14. The base end portion 32 of the shaft 12 is held and fixed to the shaft holding portion 28. A hub lumen forming portion 34 is provided on the proximal side of the shaft holding portion 28 via a step portion 30 having a diameter reduced with respect to the shaft holding portion 28.

  The inner diameter on the proximal end side of the inner peripheral portion 36 that forms the lumen 13 of the shaft 12 is larger than the inner diameter of the distal end portion of the hub lumen forming portion 34, and the step portion 30 is formed by this inner diameter difference. The base end portion 32 of the shaft 12 is in contact with the stepped portion 30.

  In the present embodiment, the hub 14 and the shaft 12 are manufactured separately, and the proximal end portion 32 of the shaft 12 is inserted into the distal end (shaft holding portion 28) of the hub 14, and adhesion, thermal fusion, or the like is performed. These are joined by appropriate joining means. The hub 14 may be provided at the rear end of the shaft 12 by insert molding.

  As shown in FIG. 2, the hub lumen forming portion 34 has an axis line b whose inner diameter decreases toward the distal end and is inclined with respect to the axis line a of the hub 14 in at least a part of the hub 14 in the axis line a direction. It has the asymmetric guide part 38 which has. Specifically, in the present embodiment, the hub lumen forming portion 34 includes a taper 40 formed over a predetermined range (length L1) in the axis a direction from the proximal end opening 26 of the hub 14, and the taper. 40 and the above-mentioned asymmetric guide portion 38 that continues from the tip.

  The taper 40 has a distal end of the guide wire 46 by an inner peripheral surface that is reduced in diameter toward the distal end when the guide wire 46 (see FIG. 3A, etc.) having a bent distal end portion 47 is inserted from the proximal end side of the hub 14. While guiding the portion 47 (see FIG. 3A and the like) toward the center of the hub 14, the tip portion 47 is guided in a direction to return to a straight line. The length L1 along the axis a of the taper 40 is, for example, about 10 mm to 40 mm, and preferably about 20 mm to 35 mm. The inclination angle of the taper 40 with respect to the axis a is 3 °.

  The asymmetric guide portion 38 receives the distal end portion 47 of the guide wire 46 from the taper 40 and inserts the distal end portion 47 into a straight line when the guide wire 46 having the bent distal end portion 47 is inserted from the proximal end side of the hub 14. It is a portion that guides the tip portion 47 to the lumen 13 of the shaft 12 while guiding in the direction of returning to the shape. The asymmetric guide part 38 can be provided at a predetermined position and direction with respect to the blade part 22 so that the position can be recognized from the appearance of the hub 14.

  The length L2 along the axis a direction of the asymmetric guide portion 38 is, for example, about 5 mm to 15 mm, preferably about 5 mm to 10 mm. The length L2 may be longer or shorter than the length L1.

  In the present embodiment, the asymmetric guide portion 38 is configured as a first guide portion 42 configured as a steep taper having a relatively large inclination angle with respect to the axis a, and a gentle taper having a relatively small inclination angle with respect to the axis a. And a second guide portion 44. Specifically, the first guide part 42 is a part that constitutes a part of the circumferential direction of the asymmetric guide part 38 (the upper part in FIG. 2), and the second guide part 44 is the first part with respect to the axis a. A portion opposite to the one guide portion 42 (the lower portion in FIG. 2) is configured, and the inclination angle of the hub 14 with respect to the axis a is smaller than the inclination angle of the first guide portion 42 with respect to the axis a of the hub 14. .

  The inclination angle of the first guide portion 42 with respect to the axis line a may be the same as or different from the inclination angle of the taper 40 with respect to the axis line a. The inclination angle of the first guide portion 42 with respect to the axis a is, for example, about 5 ° to 15 °, preferably about 5 ° to 10 °.

  The inclination angle of the second guide portion 44 with respect to the axis line a may be the same as or different from the inclination angle of the taper 40 with respect to the axis line a. The inclination angle of the second guide portion 44 with respect to the axis a is, for example, about 0 ° to 10 °, preferably about 0 ° to 5 °.

  The catheter 10 including the hub 14 according to the present embodiment is basically configured as described above. Hereinafter, the operation of the catheter 10 including the hub 14 will be mainly described with reference to FIGS. 3A to 3C. The effects will be described. In this example, an operation for inserting the guide wire 46 with the distal end portion 47 bent from the proximal end side (the proximal end opening portion 26) of the hub 14 will be described. 3A to 3C, the distal end portion 47 of the guide wire 46 is bent so as to have two bent portions 48 and 49, but the present invention is also applicable to the case where there is only one bent portion. . The leading end portion 50 of the guide wire 46 is formed in a round shape.

  As shown in FIG. 3A, the guide wire 46 with the distal end portion 47 bent is inserted from the proximal end side of the hub 14. At this time, in the example of FIG. 3A, the bent portion 49 of the guide wire 46 is brought into contact with the side corresponding to the first guide portion 42 (steep taper) of the asymmetric guide portion 38 in the circumferential direction, and the second guide portion 44 ( The most distal portion 50 of the guide wire 46 is brought into contact with the side corresponding to the gentle taper.

  When the guide wire 46 and the hub 14 are maintained in the circumferential positional relationship as described above and the guide wire 46 is further pushed into the distal end direction with respect to the hub 14, the guide wire 46 is 50 and the bent portion 49 move in the distal direction while sliding on the inner peripheral surface of the hub 14. At this time, the guide wire 46 is guided to the axis a side of the hub 14 by the action of the inclination of the taper 40, and the distal end portion 47 of the guide wire 46 is guided in a direction to return to a straight line.

  As shown in FIG. 3B, when the most distal portion 50 of the guide wire 46 reaches the asymmetric guide portion 38 across the boundary between the taper 40 and the asymmetric guide portion 38, the most distal portion 50 of the guide wire 46 becomes the asymmetric guide. When the guide wire 46 is further pushed toward the axis a side of the hub 14 by the second guide portion 44 of the portion 38, the bent tip portion 47 of the guide wire 46 is further guided in a direction to return to a straight line. That is, as the guide wire 46 moves in the distal direction, the bending angle of the distal end portion 47 of the guide wire 46 is further reduced by the action of the inclination of the second guide portion 44.

  In this case, in the present embodiment, since the second guide portion 44 is configured as a gentle taper having a small inclination angle with respect to the axis a, the leading end portion 50 of the guide wire 46 and the inner peripheral surface of the hub 14 are arranged. Small contact angle. Therefore, in the second guide portion 44, frictional resistance (sliding resistance) between the most distal portion 50 of the guide wire 46 and the inner peripheral surface of the hub 14 is suppressed.

  As described above, when the frictional resistance between the most distal end portion 50 and the inner peripheral surface of the hub 14 is small, the guide wire 46 from the hand side even when the distal end portion 47 of the guide wire 46 is inserted to the distal end side of the hub 14. Is effectively transmitted to the distal end portion 47 of the guide wire 46, so that the distal end portion 47 of the guide wire 46 is easily moved in the distal end direction. Accordingly, since the movement of the guide wire 46 is not prevented by the inner peripheral surface of the hub 14, the guide wire 46 is further pushed in the distal direction from the state of FIG. 3B as shown in FIG. 3C. In addition, the distal end portion 47 of the guide wire 46 can be smoothly inserted into the shaft 12.

  Contrary to the above description, when the guide wire 46 with the distal end 47 bent is inserted from the proximal end side of the hub 14 as indicated by the phantom line in FIG. The distal end portion 50 of the guide wire 46 may be brought into contact with the guide portion 42 (steep taper) side, and the bent portion 49 of the guide wire 46 may be brought into contact with the second guide portion 44 (slow taper) side. Even when the circumferential positional relationship between the guide wire 46 and the hub 14 is set as described above, the bent portion 49 of the guide wire 46 abuts on the second guide portion 44 configured as a gentle taper. The contact angle between the bent portion 49 and the inner peripheral surface of the hub 14 is small.

  Accordingly, in the second guide portion 44, the frictional resistance (sliding resistance) between the bent portion 49 of the guide wire 46 and the inner peripheral surface of the hub 14 is suppressed, so that the distal end portion 47 of the guide wire 46 becomes the distal end of the hub 14. Even when the guide wire 46 is inserted to the side, the pushing force of the guide wire 46 from the proximal side is effectively transmitted to the distal end portion 47 of the guide wire 46, so that the distal end portion 47 of the guide wire 46 is easily moved in the distal direction.

  As described above, according to the hub 14 according to the present embodiment, when the guide wire 46 with the distal end portion 47 bent is inserted from the proximal end side of the hub 14, the axis a of the hub 14 in the asymmetric guide portion 38. When the distal end portion 47 (the most distal end portion 50 or the bent portion 49) of the guide wire 46 is brought into contact with a portion (second guide portion 44) having a small inclination angle with respect to the distal end portion 47 of the guide wire 46 and the inner periphery of the hub 14 The frictional resistance with the surface is reduced, and the distal end portion 47 of the guide wire 46 is easily moved in the distal direction. Therefore, the movement of the guide wire 46 is not blocked by the inner peripheral surface of the hub 14, and the guide wire 46 can be smoothly inserted into the shaft 12.

  In particular, in the case of the present embodiment, the inclination angle of the first guide portion 42 is relatively large, and the inclination angle of the second guide portion 44 on the opposite side is relatively small. Therefore, when the guide wire 46 having the bent distal end portion 47 is inserted from the proximal end side of the hub 14, the distal end portion 47 of the guide wire 46 is brought into contact with the second guide portion 44 having a relatively small inclination angle. Thus, the guide wire 46 can be smoothly moved in the distal direction in the hub 14 in a state where the frictional resistance between the distal end portion 47 of the guide wire 46 and the inner peripheral surface of the hub 14 is small.

  In the case of this embodiment, an asymmetric guide portion 38 is formed continuously with the tip of the taper 40. According to this configuration, when the guide wire 46 having the distal end portion 47 bent is inserted from the proximal end side of the hub 14, the guide wire 46 reaches the asymmetric guide portion 38 when the distal end portion 47 exceeds the taper 40. Therefore, the friction resistance between the distal end portion 47 of the guide wire 46 and the inner peripheral surface of the hub 14 can be suppressed at a relatively early stage after the insertion of the guide wire 46 is started, and the insertion operation of the guide wire 46 is performed more effectively. be able to.

  FIG. 4 is a partially omitted longitudinal sectional view of a catheter hub 14a (hereinafter referred to as “hub 14a”) according to a modification. As shown in FIG. 4, the hub lumen forming portion 34 a in the hub 14 a according to the modification includes a taper 40, an intermediate tapered portion 52 formed continuously with the tip of the taper 40, and a tip of the intermediate tapered portion 52. And an asymmetric guide portion 56 formed in a row. That is, in the hub 14 a, the asymmetric guide portion 56 is provided on the tip side of the taper 40 via the intermediate taper portion 52.

  The intermediate taper portion 52 receives the distal end portion 47 of the guide wire 46 from the taper 40 when the guide wire 46 having the distal end portion 47 bent is inserted from the proximal end side of the hub 14a, and the distal end portion 47 of the guide wire 46 is received. Is a portion that guides the distal end portion 47 of the guide wire 46 to the asymmetric guide portion 56 formed on the distal end side thereof.

  The length L3 along the axis a direction of the intermediate taper portion 52 is, for example, about 5 mm to 15 mm, preferably about 5 mm to 10 mm. The length L3 may be longer or shorter than the length L1. The inclination angle of the intermediate taper portion 52 with respect to the axis a is, for example, about 5 ° to 15 °, preferably about 5 ° to 10 °.

  The asymmetric guide portion 56 receives the distal end portion 47 of the guide wire 46 from the intermediate taper portion 52 when the guide wire 46 having the distal end portion 47 bent is inserted from the proximal end side of the hub 14a. Further, it is a portion that guides in the direction of returning to a straight line and guides the tip portion 47 to the lumen 13 of the shaft 12. The asymmetric guide portion 56 has an axis c that has an inner diameter that decreases in the distal direction and is inclined with respect to the axis a of the hub 14a.

  The length L4 along the axis a direction of the asymmetric guide part 56 is, for example, about 2 mm to 10 mm, preferably about 2 mm to 5 mm. The length L4 may be longer or shorter than the length L3.

  The asymmetric guide part 56 includes a first guide part 58 configured as a steep taper having a relatively large inclination angle with respect to the axis a, and a second guide part 60 configured as a gentle taper having a relatively small inclination angle with respect to the axis a. And have. Specifically, the first guide part 58 is a part constituting a part of the asymmetric guide part 56 in the circumferential direction (the upper part in FIG. 4), and the second guide part 60 is the first part with respect to the axis a. A portion opposite to the one guide portion 58 (the lower portion in FIG. 4) is configured, and the inclination angle of the hub 14a with respect to the axis a is smaller than the inclination angle of the first guide portion 58 with respect to the axis a of the hub 14a. . In the configuration example shown in FIG. 4, the angle of the second guide portion 60 with respect to the axis a is approximately 0 °.

  The inclination angle of the first guide portion 58 with respect to the axis line a may be the same as or different from the inclination angle of the taper 40 with respect to the axis line a. The inclination angle of the first guide portion 58 with respect to the axis a is, for example, about 5 ° to 15 °, preferably about 5 ° to 10 °.

  The inclination angle of the second guide portion 60 with respect to the axis line a may be the same as or different from the inclination angle of the taper 40 with respect to the axis line a. The inclination angle of the second guide portion 60 with respect to the axis a is, for example, about 0 ° to 10 °, preferably about 0 ° to 5 °.

  According to the hub 14a configured as described above, the frictional resistance between the distal end portion 47 of the guide wire 46 and the inner peripheral surface of the hub 14a in the asymmetric guide portion 56 is similar to the hub 14 shown in FIG. It becomes small and the front-end | tip part 47 of the guide wire 46 becomes easy to move to a front-end | tip direction.

  That is, as shown in FIG. 5A, when the guide wire 46 with the distal end portion 47 bent is inserted from the proximal end side of the hub 14a, the guide wire is placed on the first guide portion 58 (steep taper) side of the asymmetric guide portion 56. 46, when the leading end 50 of the guide wire 46 is brought into contact with the second guide portion 60 (slow taper), the leading end 50 of the guide wire 46 and the inner peripheral surface of the hub 14a. The contact angle with is small. As a result, in the second guide portion 60, frictional resistance (sliding resistance) between the most distal portion 50 of the guide wire 46 and the inner peripheral surface of the hub 14a is suppressed, and the distal end portion 47 of the guide wire 46 moves in the distal direction. It becomes easy to do.

  Contrary to FIG. 5A, as shown in FIG. 5B, when the guide wire 46 having the distal end portion 47 bent is inserted from the proximal end side of the hub 14a, the first guide portion 58 (steep taper) of the asymmetric guide portion 56 is inserted. ) Side, the most distal portion 50 of the guide wire 46 is brought into contact with the second guide portion 60 (slow taper) side and the bent portion 49 of the guide wire 46 is brought into contact with the second guide portion 46 (slow taper) side. Since the bent portion 49 of the guide wire 46 contacts the guide portion 60, the contact angle between the bent portion 49 of the guide wire 46 and the inner peripheral surface of the hub 14a is small. As a result, in the second guide portion 60, frictional resistance (sliding resistance) between the most distal portion 50 of the guide wire 46 and the inner peripheral surface of the hub 14a is suppressed, and the distal end portion 47 of the guide wire 46 moves in the distal direction. It becomes easy to do.

  5A and 5B, the guide wire 46 can be smoothly inserted into the shaft 12 without the movement of the guide wire 46 being blocked by the inner peripheral surface of the hub 14a. it can.

  In particular, in the hub 14a, the asymmetric guide portion 56 is provided on the distal end side of the hub lumen forming portion 34a, so that the pushing force of the guide wire 46 from the proximal side is difficult to be transmitted on the distal end side of the hub lumen forming portion 34a. The frictional resistance between the distal end portion 47 of the guide wire 46 and the inner peripheral surface of the hub 14a can be effectively suppressed.

  In the above description, the present invention has been described with reference to preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Yes.

DESCRIPTION OF SYMBOLS 10 ... Catheter 12 ... Shaft 14, 14a ... Catheter hub 24 ... Hub lumen | bore 26 ... Proximal opening part 30 ... Step part 34, 34a ... Hub lumen | bore formation part 38, 56 ... Asymmetric guide part 40 ... Taper 42, 58 ... 1st guide part 44,60 ... 2nd guide part 52 ... Intermediate taper part

Claims (4)

A shaft holding portion for holding the base end of the shaft;
A hub lumen forming portion which is provided on the proximal end side of the shaft holding portion and forms a hub lumen communicating with the lumen of the shaft;
A catheter hub comprising:
The hub lumen forming portion has an asymmetric guide portion having an axis whose inner diameter decreases in the distal direction and is inclined with respect to the axis of the catheter hub in at least a part of the axis direction of the catheter hub.
A catheter hub characterized by that. The catheter hub of claim 1,
The asymmetric guide part is
A first guide portion constituting a part of the circumferential direction in the asymmetric guide portion;
A portion of the catheter hub opposite to the first guide portion is configured with respect to the axis, and an inclination angle of the catheter hub with respect to the axis is an inclination angle of the first guide portion with respect to the axis of the catheter hub. A second guide portion that is smaller than,
A catheter hub characterized by that. The catheter hub according to claim 1 or 2,
The hub lumen forming portion has a taper formed over a predetermined range in the axial direction from the proximal end opening of the catheter hub,
The asymmetric guide portion is formed continuously with the tip of the taper.
A catheter hub characterized by that. The catheter hub according to claim 1 or 2,
The hub lumen forming part has a taper formed over a predetermined range in the axial direction from the proximal end opening of the catheter hub, and an intermediate taper part formed on the distal side of the taper.
The asymmetric guide part is provided on the tip side of the taper through the intermediate taper part.
A catheter hub characterized by that.

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