Catheter

Abstract

To provide a catheter for excellently fixing a hemostatic valve inside a catheter hub.SOLUTION: A catheter 10 includes a valve fixing structure for fixing a hemostatic valve 18 with respect to a catheter hub 16. The valve fixing structure includes: a projection part 36 arranged on one of an inner peripheral surface of the catheter hub 16 and an outer peripheral surface 31 of the hemostatic valve 18; and a recession part 38 arranged on the other one of the inner peripheral surface of the catheter hub 16 and the outer peripheral surface 31 of the hemostatic valve. The recession part 38 includes: a reception inlet 40 for receiving the projection part 36; a storage part 44 for storing the projection part 36; and an introduction part 42 for introducing the projection part 36 via the reception inlet 40 so as to guide the projection part 36 to the storage part 44. The introduction part 42 is arranged at a position different from that of the storage part 44 in a circumferential direction of the catheter hub 16.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a catheter. [Background technology]

[0002] Catheter assemblies used for administering fluid infusions to patients are well known (see, for example, Patent Document 1 below). This type of catheter assembly includes a catheter and a needle member. The catheter has a catheter body, a catheter hub fixed to the base end of the catheter body, and a hemostatic valve arranged within the catheter hub. The needle member has an inner needle inserted into the catheter body and a needle hub fixed to the base end of the inner needle. When using the catheter assembly, the respective tips of the inner needle and the catheter body puncture the skin and blood vessel of a living body, and then the catheter body is advanced relative to the inner needle, inserting the catheter body a predetermined length into the blood vessel. The inner needle is removed from the catheter, and the hemostatic valve prevents blood from leaking from the catheter hub. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2016-509915 Summary of the Invention [Problem to be solved by the invention]

[0004] In most cases, catheters are inserted into veins. However, catheters may also be inserted into arteries. Because arterial pressure is higher than venous pressure, if a catheter designed for venous placement is used for arterial placement, higher-than-intended pressure may be applied to the hemostatic valve, causing it to shift from its intended position in the catheter hub. If the hemostatic valve shifts, blood may leak from the catheter hub.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] (1) One aspect of the present invention is a catheter comprising a hollow catheter body, a catheter hub fixed to the base end of the catheter body, a hemostatic valve disposed within the catheter hub, and a valve fixing structure for fixing the hemostatic valve to the catheter hub, wherein the valve fixing structure has a convex portion provided on one of the inner circumferential surface of the catheter hub and the outer circumferential surface of the hemostatic valve, and a concave portion provided on the other of the inner circumferential surface of the catheter hub and the outer circumferential surface of the hemostatic valve, and the concave portion has a receiving port for receiving the convex portion, a storage portion for storing the convex portion, and an introduction portion provided at a position different from the storage portion in the circumferential direction of the catheter hub, for introducing the convex portion through the receiving port and guiding the convex portion to the storage portion.

[0007] With this configuration, the convex portion of the valve fixing structure fits into the concave portion, thereby enabling the hemostatic valve to be well fixed within the catheter hub. Therefore, even if high pressure (e.g., arterial pressure) is applied to the hemostatic valve, the hemostatic valve is prevented from shifting from its predetermined position within the catheter hub. Because the valve fixing structure has a receiving port, an introduction portion, and a storage portion, during the catheter assembly process, the hemostatic valve can be inserted into the catheter hub and rotated relative to the catheter hub to fix the hemostatic valve to the catheter hub.

[0008] (2) In the catheter described in (1) above, three or more of the valve fixing structures may be provided at intervals in the circumferential direction.

[0009] This configuration improves the holding force on the hemostatic valve, making it possible to more effectively prevent the hemostatic valve from shifting from its predetermined position within the catheter hub.

[0010] (3) In the catheter described in (2) above, three or more of the valve fixing structures may be provided at equal intervals in the circumferential direction.

[0011] With this configuration, the holding force of the valve fixing structure on the hemostatic valve is further improved.

[0012] (4) In the catheter described in any one of (1) to (3) above, the dimensions of the convex portion in the natural state may be larger than the dimensions of the storage portion in the natural state in the axial direction of the catheter hub.

[0013] With this configuration, the holding force of the valve fixing structure on the hemostatic valve is further improved.

[0014] (5) In the catheter described in any one of (1) to (4) above, the convex portion may be provided on the catheter hub, the concave portion may be provided on the hemostatic valve, and the concave portion may clamp the convex portion in the axial direction of the catheter hub by the elastic force of the hemostatic valve.

[0015] With this configuration, the holding force of the hemostatic valve by the valve fixing structure is further improved.

[0016] (6) In the catheter according to any one of (1) to (5) above, the dimension of the convex portion in the axial direction of the catheter hub may be smaller than the dimension of the introduction portion.

[0017] This configuration improves the ease of assembly when placing the hemostatic valve inside the catheter hub.

[0018] (7) In the catheter described in any one of (1) to (4) above, the convex portion may be provided on the hemostatic valve, the concave portion may be provided on the catheter hub, and the convex portion may be elastically compressed in the axial direction of the catheter hub by being clamped by the concave portion.

[0019] With this configuration, the holding force of the valve fixing structure on the hemostatic valve is further improved.

[0020] (8) In the catheter described in any one of (1) to (7) above, the recess may have a rotation regulating portion between the introduction portion and the storage portion, and the rotation regulating portion may allow the convex portion to move from the introduction portion to the storage portion and may prevent the convex portion from moving from the storage portion to the introduction portion.

[0021] This configuration can prevent the hemostatic valve from shifting circumferentially relative to the catheter hub.

[0022] (9) In the catheter described in any one of (1) to (8) above, the hemostatic valve may have a contact portion that contacts the inner surface of the catheter hub, and the catheter hub may have a locking protrusion that engages with the base end of the contact portion.

[0023] With this configuration, the holding force on the hemostatic valve is the sum of the holding force component provided by the valve fixing structure and the holding force component provided by the locking protrusion, thereby further improving the holding force on the hemostatic valve provided by the valve fixing structure. [Effects of the Invention]

[0024] According to the catheter of the present invention, the convex portion of the valve fixing structure fits into the concave portion, thereby enabling the hemostatic valve to be fixed well within the catheter hub. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a cross-sectional view of a catheter according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a perspective view of a hemostatic valve. [Figure 4] Fig. 4A is a cross-sectional view taken along line IVA-IVA in Fig. 2. Fig. 4B is a cross-sectional view taken along line IVB-IVB in Fig. 2. [Figure 5]Figure 5A is an explanatory diagram of the positioning step in the catheter assembly method, Figure 5B is an explanatory diagram of the insertion step in the catheter assembly method, and Figure 5C is an explanatory diagram of the rotation step in the catheter assembly method. [Figure 6] FIG. 6 is a cross-sectional view of a catheter according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0026] 1 is a vascular access device that is inserted into a blood vessel. The catheter 10 is configured as a catheter assembly 100 by being combined with a needle member 12. The catheter assembly 100 can be configured as a peripheral arterial or venous indwelling needle, a dialysis indwelling needle, a PICC, a midline catheter, a CV catheter, or the like.

[0027] The catheter 10 has a catheter body 14, a catheter hub 16, and a hemostatic valve 18. In the following description, the circumferential direction of the catheter hub 16 and the circumferential direction of the hemostatic valve 18 refer to the same direction. For this reason, they may be referred to simply as the "circumferential direction" without distinction between them. The axial direction of the catheter hub 16 and the axial direction of the hemostatic valve 18 refer to the same direction. For this reason, they may be referred to simply as the "axial direction" without distinction between them.

[0028] The catheter body 14 is a flexible tube. The material of the catheter body 14 is not particularly limited. Examples of materials that can be used for the catheter body 14 include ETFE, PTFE, PFA, PE, and PU. In the initial state of the catheter assembly 100, the inner needle 120 of the needle member 12 is inserted into the lumen 15 of the catheter body 14.

[0029] The catheter hub 16 is a hollow tubular member. The reduced-diameter distal end of the catheter hub 16 holds the proximal end of the catheter body 14. That is, the proximal end of the catheter body 14 is fixed to the distal end of the catheter hub 16. The catheter hub 16 has a hollow portion 17. The hollow portion 17 is the internal space of the catheter hub 16. The hollow portion 17 communicates with the lumen 15 of the catheter body 14. The catheter hub 16 has an inner circumferential surface 160 that surrounds the hollow portion 17. The catheter hub 16 is attached to the patient's skin with tape or the like and is left in the patient together with the catheter body 14.

[0030] As shown in FIG. 4A , the inner circumferential surface 160 of the catheter hub 16 is provided with a valve holding portion 20 for holding the hemostatic valve 18. The valve holding portion 20 is an annular groove recessed radially outward on the inner circumferential surface 160 of the catheter hub 16. A step 22 is provided on the distal end side of the valve holding portion 20. The step 22 is a wall that constitutes the distal end side of the valve holding portion 20. The wall surface of the step 22 is perpendicular to the axis of the catheter hub 16. A locking protrusion 24 is provided on the proximal end side of the valve holding portion 20. The locking protrusion 24 is an annular protrusion that protrudes radially inward from the inner circumferential surface 160 of the catheter hub 16. The locking protrusion 24 is not limited to an annular protrusion, but may be composed of multiple protrusion elements spaced apart circumferentially.

[0031] Examples of materials that can be used to form the catheter hub 16 include thermoplastic resins such as polypropylene, polycarbonate, polyamide, polysulfone, polyarylate, methacrylate-butylene-styrene copolymer, polyurethane, acrylic resin, and ABS resin.

[0032] 1, in the initial state of the catheter assembly 100, the inner needle hub 121 of the needle member 12 is fitted to the proximal end of the catheter hub 16. The inner needle hub 121 is detachable from the proximal end of the catheter hub 16. A safety member may be disposed inside the catheter hub 16, which covers the needle tip of the inner needle 120 when the inner needle 120 is removed from the catheter body 14.

[0033] The hemostatic valve 18 is disposed inside the catheter hub 16 (hollow portion 17). The hemostatic valve 18 is fixed to the inner circumferential surface 160 of the catheter hub 16. The hemostatic valve 18 allows the flow of liquid toward the distal end of the catheter hub 16. Therefore, the hemostatic valve 18 allows the infusion fluid to flow from the catheter hub 16 to the catheter main body 14. The hemostatic valve 18 prevents the flow of liquid toward the proximal end of the catheter hub 16. Therefore, the hemostatic valve 18 prevents blood that has flowed into the catheter hub 16 via the catheter main body 14 from flowing toward the proximal end of the hemostatic valve 18.

[0034] The hemostatic valve 18 is made of an elastic material. There are no particular limitations on the material of the hemostatic valve 18. Examples of materials that can be used for the hemostatic valve 18 include various rubber materials such as natural rubber, butyl rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, and silicone rubber, various thermoplastic elastomers such as polyurethane-based, polyester-based, polyamide-based, olefin-based, and styrene-based elastomers, and mixtures of these.

[0035] The hemostatic valve 18 has a contact portion 30 and a valve portion 32. The contact portion 30 constitutes the base end of the hemostatic valve 18. As shown in FIG. 4A, the contact portion 30 is held by an annular valve holding portion 20 provided on the inner circumferential surface 160 of the catheter hub 16. The contact portion 30 is configured in an annular shape (see FIG. 3). The tip portion of the contact portion 30 contacts a step portion 22 of the valve holding portion 20. The base end portion of the contact portion 30 engages with a locking protrusion 24. Therefore, the contact portion 30 is held between the step portion 22 of the catheter hub 16 and the locking protrusion 24. Note that the locking protrusion 24 does not have to be provided. The contact portion 30 contacts the valve holding portion 20 and adheres liquid-tight to the valve holding portion 20. Note that the outer circumferential surface 31 of the contact portion 30 does not need to be in liquid-tight contact with the inner circumferential surface of the valve holding portion 20. In this case, it is sufficient that the tip surface 310 of the contact portion 30 is in liquid-tight contact with the base end surface of the step portion 22, or that the base end of the outer periphery of the contact portion 30 is in liquid-tight contact with the locking projection 24.

[0036] As shown in FIG. 3 , the valve portion 32 extends distally from the contact portion 30. The outer diameter of the valve portion 32 is smaller than the outer diameter of the contact portion 30. Therefore, the contact portion 30 protrudes radially outward from the outer circumferential surface of the valve portion 32. The valve portion 32 may have a duckbill structure. The duckbill structure has a pair of bills 320 that approach each other distally. An openable and closable slit 321 is provided at the distal end of the duckbill structure. The valve portion 32 is not limited to a duckbill structure and may have, for example, a disk structure. An air vent groove may be provided on the outer circumferential portion of the contact portion 30 to allow air to escape from the distal end to the proximal end of the hemostatic valve 18. This air vent groove has a flow path cross-sectional area that allows gas to pass but prevents liquid from passing through.

[0037] As shown in FIG. 2, the catheter 10 further includes a valve fixing structure 34. The valve fixing structure 34 fixes the hemostatic valve 18 to the catheter hub 16. Three or more valve fixing structures 34 may be provided at circumferential intervals. In this case, the three or more valve fixing structures 34 may be provided at equal circumferential intervals. In FIG. 2, three valve fixing structures 34 are provided at equal circumferential intervals. Note that only one valve fixing structure 34 may be provided. Two valve fixing structures 34 may be provided. Four or more valve fixing structures 34 may be provided.

[0038] Each valve fixing structure 34 has a protrusion 36 and a recess 38. The protrusion 36 is provided on one of the inner circumferential surface 160 of the catheter hub 16 and the outer circumferential surface of the hemostatic valve 18. In FIG. 2, the protrusion 36 is provided on the inner circumferential surface 160 of the catheter hub 16.

[0039] In Fig. 4B, the protrusion 36 protrudes radially inward from the bottom of the valve holding portion 20. As illustrated in Fig. 4B, in a cross section taken along the axis of the catheter hub 16, the protrusion 36 has a trapezoidal shape that becomes shorter in the axial direction toward the radially inward direction. In a cross section taken along the axis of the catheter hub 16, the protrusion 36 may have a rectangular shape with an axial dimension that is constant in the radial direction.

[0040] The shape of the protrusion 36 is not particularly limited. The protrusion 36 may be a polygonal prism such as a triangular prism or a quadrangular prism. The protrusion 36 may have a shape including a support pillar and a spherical portion provided at one end of the support pillar. The protrusion 36 may be integrally molded with other portions of the catheter hub 16 (portions of the catheter hub 16 other than the protrusion 36). The catheter hub 16 may be formed by joining a first part that constitutes the protrusion 36 and a second part that constitutes the portions of the catheter hub 16 other than the protrusion 36. In this case, the first part and the second part may be made of different materials.

[0041] The recess 38 is provided on the other of the inner circumferential surface 160 of the catheter hub 16 and the outer circumferential surface of the hemostatic valve 18. In Figures 2 and 3, the recess 38 is provided on the outer circumferential surface of the hemostatic valve 18. In this case, the outer circumferential surface of the hemostatic valve 18 on which the recess 38 is provided is the outer circumferential surface 31 of the contact portion 30.

[0042] As shown in Figure 3, the recess 38 opens to the outer peripheral surface 31 of the contact portion 30 of the hemostatic valve 18. The recess 38 is a groove recessed radially inward from the outer peripheral surface 31 of the contact portion 30. The recess 38 has a receiving port 40, an introduction portion 42, a storage portion 44, and a rotation restriction portion 46.

[0043] The receiving port 40 is an opening for receiving the protrusion 36. The receiving port 40 opens to the tip surface 310 of the contact portion 30. The introduction portion 42 is a groove for introducing the protrusion 36 through the receiving port 40 and guiding the protrusion 36 to the storage portion 44.

[0044] The introduction portion 42 has an axial portion 420 and a circumferential portion 421. The axial portion 420 extends in the axial direction of the hemostasis valve 18. The receiving port 40 is located at the tip of the axial portion 420. The circumferential portion 421 extends from the axial portion 420 in the circumferential direction of the hemostasis valve 18. Therefore, when viewed from the radially outside of the hemostasis valve 18, the introduction portion 42 has an L-shaped bent shape. In the circumferential direction, the dimension of the protrusion 36 is smaller than the dimension of the introduction portion 42.

[0045] As shown in Figure 4A, in a cross section taken along the axis of the catheter hub 16, the circumferential portion 421 of the introduction portion 42 is trapezoidal in shape, becoming shorter in the axial direction radially inward. When the circumferential portion 421 has such a trapezoidal shape, a draft angle is set during injection molding, resulting in excellent mold releasability. In a cross section taken along the axis of the hemostatic valve 18, the introduction portion 42 may be rectangular in shape with a constant axial dimension in the radial direction. In the axial direction of the catheter hub 16, the dimension of the protrusion 36 is smaller than the dimension of the introduction portion 42 (circumferential portion 421).

[0046] As shown in FIG. 2, the storage portion 44 is a groove that stores the protrusion 36. The storage portion 44 and the introduction portion 42 are provided at different positions in the circumferential direction. Therefore, the storage portion 44 and the introduction portion 42 are provided at a distance from each other in the circumferential direction. In the circumferential direction, the dimension of the protrusion 36 is smaller than the dimension of the storage portion 44. In the axial direction, the dimension of the storage portion 44 is smaller than the dimension of the introduction portion 42 (circumferential portion 421).

[0047] As shown in Fig. 4B, in a cross section taken along the axis of the hemostasis valve 18, the storage section 44 has a trapezoidal shape that shortens axially inward in the radial direction. When the storage section 44 has such a trapezoidal shape, a draft angle is set during injection molding, resulting in excellent demoldability. In a cross section taken along the axis of the hemostasis valve 18, the storage section 44 may have a rectangular shape with a constant axial dimension in the radial direction.

[0048] As illustrated in Figure 4B, in the axial direction of the catheter hub 16, the dimensions of the convex portion 36 in its natural state are larger than the dimensions of the storage portion 44 (the storage portion 44 shown by imaginary lines) in its natural state. With regard to the convex portion 36 and the storage portion 44, the natural state refers to a state in which they are not elastically deformed by an external force. Because the hemostatic valve 18 is made of an elastic material, when the convex portion 36 is fitted into the storage portion 44, the convex portion 36 pushes the storage portion 44 apart in the axial direction. Therefore, in the axial direction of the catheter hub 16, the elastic force of the hemostatic valve 18 causes the recessed portion 38 (storage portion 44) to clamp the convex portion 36.

[0049] 3, the rotation restricting portion 46 is provided between the introduction portion 42 and the storage portion 44. The rotation restricting portion 46 allows the protrusion 36 to move from the introduction portion 42 to the storage portion 44. The rotation restricting portion 46 prevents the protrusion 36 from moving from the storage portion 44 to the introduction portion 42. In other words, the rotation restricting portion 46 restricts the movement of the protrusion 36 relative to the recess 38 to only one direction in the circumferential direction.

[0050] The rotation restricting portion 46 has a pair of restricting protrusions 48. Each restricting protrusion 48 is a claw portion. The pair of restricting protrusions 48 face each other in the axial direction. One restricting protrusion 48 protrudes toward the distal end from an inner wall 423 on the base end side of the introduction portion 42. The other restricting protrusion 48 protrudes toward the proximal end from an inner wall 424 on the tip end side of the introduction portion 42. Each restricting protrusion 48 has a restricting surface 480 facing the storage portion 44. As illustrated, the restricting surface 480 can be parallel to the axis of the hemostasis valve 18. The restricting surface 480 may also be non-parallel to the axis of the hemostasis valve 18.

[0051] The distance between the pair of restricting protrusions 48 is larger the closer they are to the introduction portion 42 and is smaller the closer they are to the storage portion 44. Therefore, the distance between the pair of restricting protrusions 48 in the axial direction becomes smaller from the introduction portion 42 toward the storage portion 44. Note that the rotation restricting portion 46 may have only one restricting protrusion 48.

[0052] In Figure 2, a satin finish (grained surface) may be provided on one of the valve holding portion 20 of the catheter hub 16 and the contact portion 30 of the hemostatic valve 18. The satin finish is a finely textured surface. When a satin finish is provided, the contact area between the valve holding portion 20 and the contact portion 30 is smaller than when a satin finish is not provided. Therefore, providing a satin finish can improve the slipperiness and ease of assembly when placing the hemostatic valve 18 in the catheter hub 16 during the assembly process of the catheter 10. The slipperiness may be improved by applying a lubricant such as silicone oil to at least one of the valve holding portion 20 of the catheter hub 16 and the contact portion 30 of the hemostatic valve 18.

[0053] 5A to 5C, a method for assembling the catheter 10 to place the hemostatic valve 18 at a predetermined position in the catheter hub 16 will be described. This assembly method includes an alignment step, an insertion step, and a rotation step.

[0054] As shown in Figure 5A, in the alignment process, the axis of the catheter hub 16 and the axis of the hemostatic valve 18 are aligned, and the circumferential positions of the hemostatic valve 18 and the catheter hub 16 are adjusted so that the receiving port 40 of the hemostatic valve 18 faces the protrusion 36 of the catheter hub 16 in the axial direction. That is, the relative positions of the hemostatic valve 18 and the catheter hub 16 are adjusted so that the circumferential positions of the receiving port 40 of the hemostatic valve 18 and the protrusion 36 of the catheter hub 16 match. To facilitate adjustment of the relative positions of the hemostatic valve 18 and the catheter hub 16, an indicator may be provided on the outer peripheral surface of the catheter hub 16 as a mark. The indicator may be three-dimensional (e.g., a protrusion, a depression) or two-dimensional (e.g., a line, a color-coded mark).

[0055] After the alignment step, the insertion step is performed. As shown in Figure 5B, in the insertion step, the hemostatic valve 18 is moved distally relative to the catheter hub 16, thereby inserting the protrusion 36 into the introduction portion 42 through the receiving port 40. As a result, the protrusion 36 reaches the intersection of the axial portion 420 and the circumferential portion 421 in the introduction portion 42. The position of the protrusion 36 in the recess 38 at this time is defined as the first position.

[0056] After the insertion step, the rotation step is performed. As shown in FIG. 5C , in the rotation step, the catheter hub 16 and the hemostatic valve 18 are rotated relative to each other around the axis of the catheter hub 16 so that the convex portion 36 moves from the introduction portion 42 to the storage portion 44. As a result, the convex portion 36 reaches the storage portion 44. The position of the convex portion 36 in the recessed portion 38 at this time is defined as the second position. That is, by rotating the catheter hub 16 and the hemostatic valve 18 relative to each other, the convex portion 36 moves from the first position to the second position. Note that when rotating the catheter hub 16 and the hemostatic valve 18 relative to each other, the catheter hub 16 may be fixed and the hemostatic valve 18 may be rotated. Conversely, the hemostatic valve 18 may be fixed and the catheter hub 16 may be rotated.

[0057] As the convex portion 36 moves from the introduction portion 42 (first position) to the storage portion 44 (second position), the convex portion 36 passes through the rotation restricting portion 46. When the convex portion 36 passes through the rotation restricting portion 46, the pair of restricting protrusions 48 elastically deform, causing the convex portion 36 to climb over the pair of restricting protrusions 48. In other words, movement of the convex portion 36 to the storage portion 44 is permitted. Because the distance between the pair of restricting protrusions 48 is small in the portion adjacent to the storage portion 44, the convex portion 36 cannot climb over the rotation restricting portion 46 after it reaches the storage portion 44. Therefore, movement of the convex portion 36 from the storage portion 44 to the introduction portion 42 is prevented by the rotation restricting portion 46.

[0058] This embodiment has the following advantages.

[0059] As shown in Figure 4B, according to the catheter 10, the convex portion 36 of the valve fixing structure 34 fits into the concave portion 38, thereby enabling the hemostatic valve 18 to be well fixed within the catheter hub 16. Therefore, even when high pressure (e.g., arterial pressure) is applied to the hemostatic valve 18, the hemostatic valve 18 is prevented from shifting proximally from its predetermined position within the catheter hub 16. Because the valve fixing structure 34 has the receiving port 40, the introduction portion 42, and the storage portion 44, during the assembly process of the catheter 10 (Figures 5A to 5C), the hemostatic valve 18 can be inserted into the catheter hub 16 and rotated relative to the catheter hub 16 to fix the hemostatic valve 18 to the catheter hub 16. This improves the ease of assembly of the catheter 10.

[0060] 2, three or more valve fixing structures 34 are provided at circumferential intervals. With this configuration, the holding force of the valve fixing structures 34 on the hemostatic valve 18 is improved, and displacement of the hemostatic valve 18 from its predetermined position within the catheter hub 16 can be more effectively suppressed.

[0061] Three or more valve fixing structures 34 are provided at equal intervals in the circumferential direction. With this configuration, the holding force of the valve fixing structures 34 on the hemostatic valve 18 is further improved.

[0062] 4B, the dimensions of the protrusion 36 in the natural state are larger than the dimensions of the storage portion 44 in the natural state in the axial direction of the catheter hub 16. With this configuration, the holding force of the valve fixing structure 34 on the hemostatic valve 18 is further improved.

[0063] The protrusion 36 is provided on the catheter hub 16. The recess 38 is provided on the hemostatic valve 18. In the axial direction, the recess 38 clamps the protrusion 36 by the elastic force of the hemostatic valve 18. With this configuration, the holding force of the valve fixing structure 34 on the hemostatic valve 18 is further improved.

[0064] 4A, the dimensions of the protrusion 36 in its natural state in the axial direction of the catheter hub 16 are smaller than the dimensions of the introduction section 42 in its natural state. With this configuration, the sliding resistance when the protrusion 36 moves within the introduction section 42 can be reduced during the assembly process (rotation process) of the catheter 10. This improves the ease of assembly when placing the hemostatic valve 18 in the catheter hub 16.

[0065] 2, the recess 38 has a rotation restricting portion 46 between the introduction portion 42 and the storage portion 44. The rotation restricting portion 46 allows the protrusion 36 to move from the introduction portion 42 to the storage portion 44, and prevents the protrusion 36 from moving from the storage portion 44 to the introduction portion 42. This configuration makes it possible to prevent circumferential displacement of the hemostatic valve 18 relative to the catheter hub 16.

[0066] 4B, the hemostatic valve 18 has a contact portion 30 that contacts the inner circumferential surface 160 of the catheter hub 16, and the catheter hub 16 has a locking protrusion 24 that engages with the base end of the contact portion 30. With this configuration, the holding force on the hemostatic valve 18 is the sum of the holding force component by the valve fixing structure 34 and the holding force component by the locking protrusion 24, thereby further improving the holding force on the hemostatic valve 18.

[0067] In the above-described embodiment, a configuration in which the catheter hub 16 is provided with a convex portion 36 and the hemostatic valve 18 is provided with a concave portion 38 is exemplified, but the positional relationship between the convex portion 36 and the concave portion 38 is not limited to this. As shown in FIG. 6 , the hemostatic valve 18 may be provided with a convex portion 36 and the catheter hub 16 may be provided with a concave portion 38. In this case, the convex portion 36 is made of an elastic material. Therefore, the convex portion 36 is sandwiched between the concave portions 38 and elastically compressed in the axial direction. This further improves the holding force of the valve fixing structure 34 on the hemostatic valve 18.

[0068] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention. [Explanation of symbols]

[0069] 10...catheter 14...Catheter body 16...catheter hub 18...Hemostasis valve 34...Valve fixing structure 36...Convex part 38...recess 40...Intake port 42...Introduction 44...Storage section 46...Rotation restriction part

Claims

1. a hollow catheter body; a catheter hub fixed to the proximal end of the catheter body; a hemostasis valve disposed within the catheter hub; a valve fixing structure that fixes the hemostatic valve to the catheter hub; A catheter comprising: The valve fixing structure includes: a protrusion provided on one of the inner circumferential surface of the catheter hub and the outer circumferential surface of the hemostatic valve; a recess provided on the other of the inner circumferential surface of the catheter hub and the outer circumferential surface of the hemostatic valve, The recessed portion is a receiving port for receiving the protrusion; a storage section for storing the protrusion; a catheter having an introduction portion provided at a position different from the storage portion in the circumferential direction of the catheter hub, for introducing the convex portion through the receiving port and guiding the convex portion to the storage portion.

2. The catheter of claim 1, A catheter in which three or more of the valve fixing structures are provided at intervals in the circumferential direction.

3. The catheter according to claim 2, A catheter in which three or more of the valve fixing structures are provided at equal intervals in the circumferential direction.

4. The catheter of claim 1, A catheter, wherein the dimensions of the convex portion in its natural state are larger than the dimensions of the storage portion in its natural state in the axial direction of the catheter hub.

5. The catheter of claim 1, the protrusion is provided on the catheter hub, the recess is provided in the hemostasis valve, A catheter in which the recessed portion clamps the protruding portion in the axial direction of the catheter hub by the elastic force of the hemostatic valve.

6. The catheter of claim 1, A catheter, wherein the dimensions of the convex portion are smaller than the dimensions of the introduction portion in the axial direction of the catheter hub.

7. The catheter of claim 1, the protrusion is provided on the hemostatic valve, the recess is provided in the catheter hub, A catheter in which the convex portion is elastically compressed in the axial direction of the catheter hub by being clamped by the concave portion.

8. The catheter according to any one of claims 1 to 7, the recess has a rotation restricting portion between the introduction portion and the storage portion, The rotation restricting portion allows the convex portion to move from the introduction portion to the storage portion and prevents the convex portion from moving from the storage portion to the introduction portion.

9. The catheter according to any one of claims 1 to 7, the hemostatic valve has a contact portion that contacts the inner circumferential surface of the catheter hub, The catheter hub has a locking protrusion that engages with the proximal end of the contact portion.

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