Catheter

Abstract

To provide a catheter excellent in exchangeability of a guide wire capable of securing flowability of fluid in a main lumen when a lumen into which the guide wire is inserted is provided separately from the main lumen.SOLUTION: A catheter 1 includes a long-sized first tube body 10 and a second tube body 20 extending in parallel with the first tube body 10. The second tube body 20 is shorter than the first tube body 10, and extends to a tip part of the first tube body 10, and a tip surface 14 of the first tube body 10 is positioned inside the second tube body 20. The first tube body 10 includes a tapered part 12 whose outer diameter decreases from the proximal end side of a base end of the second tube body 20 toward the tip side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a catheter for discharging a contrast medium into a lumen such as a blood vessel. [Background technology]

[0002] Catheter-based procedures are widely used for diagnosis or treatment of intraluminal tissue. When using a catheter, it is necessary to image the blood vessels. Vascular imaging is performed by injecting a contrast agent from a contrast catheter inserted into the blood vessel.

[0003] An angiography catheter has a long tubular body extending from the distal end to the proximal end. A contrast medium is circulated through the lumen of the angiography catheter tubular body, and a guidewire is inserted through the lumen. In this case, the guidewire must be at least twice as long as the entire length of the angiography catheter, which makes inserting and removing the angiography catheter into and from blood vessels cumbersome.

[0004] The length of the guidewire can be shortened by providing a short guidewire tube having a lumen for inserting a guidewire at the distal end of the tubular body, separate from the tubular body having a main lumen for circulating a contrast medium. Patent Document 1 discloses a catheter having multiple lumens at the distal end of the tubular body, although it is not used for vascular angiography. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] U.S. Patent Publication No. 2003 / 0050600 Summary of the Invention [Problem to be solved by the invention]

[0006] An angiography catheter must reliably eject contrast medium into the blood vessel from an ejection port at its tip and prevent backflow. Providing a lumen for inserting a guidewire near the tip of the angiography catheter separate from the main lumen can potentially impede the flow of contrast medium. Furthermore, an angiography catheter must have a hub at its base end to inject contrast medium. The presence of the hub makes the procedure for replacing the guidewire complicated.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide a catheter that ensures fluid flow in the main lumen and also allows for good guidewire exchangeability when a lumen for inserting a guidewire is provided separately from the main lumen. [Means for solving the problem]

[0008] (1) A catheter that achieves the above object has a long first tubular body and a second tubular body extending parallel to the first tubular body, the second tubular body being shorter than the first tubular body and extending to the tip portion of the first tubular body, and the tip surface of the first tubular body being located inside the second tubular body.

[0009] (5) A catheter that achieves the above object includes a long first tubular body, a second tubular body extending parallel to the first tubular body, and a hub provided at the base end of the first tubular body, wherein the second tubular body has an inner diameter larger than that of the first tubular body, is shorter than the first tubular body, and extends to the tip end of the first tubular body, and the hub is detachable from the first tubular body. [Effects of the Invention]

[0010] In the catheter (1) configured as described above, the second tubular body is provided only at the distal end of the first tubular body, so the guide wire inserted into the second tubular body can be shortened, reducing the complexity of the procedure. Also, since the distal end of the first tubular body is located inside the second tubular body, the outer diameter of the catheter distal end can be reduced, improving passability through narrowed portions of blood vessels, etc.

[0011] (2) In the catheter of (1) above, the first tubular body may have a tapered portion whose outer diameter decreases from the proximal end toward the distal end of the second tubular body, thereby ensuring space around the proximal end of the second tubular body and making it easier to insert a guidewire into the second tubular body.

[0012] (3) In the catheter of (2) above, the first tubular body may have an expanded diameter portion distal to the tapered portion, the inner diameter of the lumen of which increases from the base end toward the distal end. This allows the catheter to ensure a sufficient flow rate of fluid flowing through the lumen of the first tubular body, and allows contrast medium and the like to be smoothly discharged from the distal end surface.

[0013] (4) In the catheter of any one of (1) to (3) above, the distal end surface of the first tubular body may be inclined with respect to a plane perpendicular to the longitudinal direction of the first tubular body, thereby making it easier for the catheter to discharge fluid from the distal end surface of the first tubular body, thereby enabling smooth discharge of a contrast agent or the like.

[0014] In the catheter (5) configured as described above, the second tubular body is provided only at the distal end of the first tubular body, so the guide wire inserted into the second tubular body can be shortened, reducing the complexity of the procedure. Also, since the catheter's hub can be detached from the first tubular body, interference between the guide wire and the hub can be prevented when replacing or removing the catheter, making the procedure easier.

[0015] (6) In the catheter of (5) above, the distal end of the first tubular body may be located closer to the base end than the distal end of the second tubular body. This allows the catheter to have a smaller outer diameter at the distal end, thereby improving its ability to pass through narrowed portions of blood vessels.

[0016] (7) In the catheter of (5) or (6) above, the hub may have a kink-resistant protector that holds the base of the first tubular body, and the kink-resistant protector may have a guidewire lumen through which the base end of a guidewire whose tip end is inserted into the second tubular body is inserted. In this way, the catheter can suppress bleeding by providing a valve that radially compresses the kink-resistant protector, thereby crushing the guidewire lumen.

[0017] (8) In the catheter of (7) above, a valve body that radially compresses the kink-resistant protector may be provided on the outer periphery of the kink-resistant protector, and the first tubular body within the kink-resistant protector or the proximal tubular body continuous with the first tubular body may have an inner cavity that resists the pressure of the valve body. This allows the catheter to suppress bleeding from the guidewire lumen while allowing a fluid such as a contrast medium to flow. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is an overall view of a catheter according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged cross-sectional view showing the distal end of the catheter. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 4] FIG. 10 is an overall view of a catheter according to a second embodiment. [Figure 5] 5 is a cross-sectional view taken along the line AA in FIG. 4. [Figure 6] FIG. 1 is an overall view of a catheter with a guide wire inserted therethrough and the hub removed. [Figure 7] FIG. 1 is an overall view of a catheter with the hub removed and guide wires inserted through the first and second lumens. [Figure 8] FIG. 10 is an overall view of a catheter according to a third embodiment. [Figure 9] 9A and 9B are cross-sectional views taken along the line AA in FIG. 8, in which (a) shows the state before the valve body is attached, and (b) shows the state after the valve body is attached. [Figure 10]FIG. 10 is an enlarged view of the vicinity of the hub of a catheter having a valve body compression structure according to a modified example. [Figure 11] FIG. 10 is an overall view showing a catheter provided with a valve body according to a modified example, together with a guiding catheter. [Figure 12] 12A and 12B are cross-sectional views taken along the line AA in FIG. 11, where (a) shows the state before the valve body is attached, and (b) shows the state after the valve body is attached. [Figure 13] FIG. 10 is an overall view of a guiding catheter provided with a valve body. [Figure 14] 14 is a cross-sectional view taken along the line AA in FIG. 13. [Figure 15] FIG. 2 is a cross-sectional view taken along a plane perpendicular to the longitudinal axis of the distal end of a catheter in which a first tubular body is disposed within a second tubular body. [Figure 16] These are cross-sectional views along the longitudinal axis of the catheter tip in which a first tubular body is placed inside a second tubular body, where (a) shows the case where the tip surface of the first tubular body is placed on the tip surface of the second tubular body, and (b) shows the case where the tip surface of the first tubular body is placed inside the second tubular body. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that dimensions in the drawings may be exaggerated for convenience of explanation and may differ from actual dimensions. Furthermore, in this specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals to avoid redundant description. In this specification, the side of the catheter 1 that is inserted into a blood vessel will be referred to as the "tip side," and the side that is operated will be referred to as the "base side."

[0020] In the description of this specification, the direction in which the catheter 1 extends in its natural state (straight state without external force being applied) is referred to as the "longitudinal direction." The rotational direction around the longitudinal direction of the catheter 1 as the reference axis is referred to as the "circumferential direction." The side of the catheter 1 that is inserted into a blood vessel is referred to as the distal end, and the end opposite the distal end is referred to as the proximal end. The portion of the catheter 1 that includes a certain range in the longitudinal direction from the distal end (the most distal end) is referred to as the "distal portion," and the portion of the catheter 1 that includes a certain range in the longitudinal direction from the proximal end (the most proximal end) is referred to as the "proximal end."

[0021] The catheter 1 has a catheter main body 2, which is a long, flexible tubular body, and a hub 3 provided at the base end of the catheter main body 2. The hub 3 has an anti-kink protector 4 that holds the base end of the catheter main body 2.

[0022] The catheter main body 2 has a first tubular body 10 extending from the hub 3 to the distal end of the catheter main body 2, and a second tubular body 20 extending to the distal end of the first tubular body 10 and extending parallel to the first tubular body 10. The second tubular body 20 is shorter in the longitudinal direction than the first tubular body 10. The first tubular body 10 can be made of stainless steel or a resin such as PEEK (polyether ether ketone). The second tubular body 20 can be made of a resin such as polyamide or polyimide. However, the first tubular body 10 and the second tubular body 20 may be made of materials other than these.

[0023] 2, the first tubular body 10 has a first lumen 11 along its longitudinal axis, and the second tubular body 20 has a second lumen 21 along its longitudinal axis. The first lumen 11 allows a contrast medium to flow from the base end toward the tip end, and discharges the contrast medium at the tip end surface 14. The second lumen 21 is used to insert the guidewire 100, and the discharged contrast medium flows out from the tip opening of the second tubular body 20, and is also used for angiography.

[0024] The first tubular body 10 has a distal end surface 14 located within the second lumen 21 inside the second tubular body 20. The first tubular body 10 has a tapered portion 12 whose outer diameter decreases from the proximal end toward the distal end relative to the proximal end of the second tubular body 20. The inner diameter of the first tubular body 10 at the tapered portion 12 also decreases toward the distal end. The inner diameter of the first lumen 11 on the proximal side of the tapered portion 12 is smaller than the inner diameter of the second lumen 21. The inner diameter of the first lumen 11 on the distal side of the tapered portion 12 is also smaller than the inner diameter of the first lumen 11 on the proximal side of the tapered portion 12. The first tubular body 10 has a smaller diameter than the second tubular body 20 and its distal end is located inside the second tubular body 20, so the outer diameter of the distal end of the catheter 1 can be reduced, improving the catheter 1's ability to pass through, for example, a narrowed portion of a blood vessel.

[0025] 3, the first tubular body 10 is located within the second lumen 21 at the proximal end of the second lumen 21, thereby reducing the space of the second lumen 21. The first tubular body 10 has the tapered portion 12 closer to the proximal end than the second tubular body 20, which increases the space of the second tubular body 20 on the proximal side of the second lumen 21. Therefore, the second tubular body 20 can ensure sufficient space for inserting the guidewire 100, allowing the guidewire 100 inserted through the second lumen 21 to move smoothly.

[0026] The first tubular body 10 has an expanded diameter section 13 distal to the tapered section 12, where the inner diameter of the first lumen 11 increases from the base end toward the distal end. Furthermore, the distal end surface 14 of the first tubular body 10 is inclined with respect to a plane perpendicular to the longitudinal axis direction of the first tubular body 10. The inclined expanded diameter section 13 and the distal end surface 14 allow the contrast medium flowing inside the first lumen 11 toward the distal end to be smoothly discharged.

[0027] The outer diameter of the first tubular body 10 is not particularly limited, but may be, for example, 0.5 to 1.0 mm, preferably 0.5 mm. The inner diameter of the first tubular body 10 is not particularly limited, but may be, for example, 0.2 to 0.7 mm, preferably 0.3 mm. The outer diameter of the second tubular body 20 is not particularly limited, but may be, for example, 1.5 to 2.5 mm. The inner diameter of the second tubular body 20 is not particularly limited, but may be, for example, 1.2 to 2.1 mm.

[0028] The hub 3 is fixed to the base end of the first tubular body 10. The material of the hub 3 is not particularly limited, but it is formed from a resin such as polycarbonate, polyamide, polysulfone, polyarylate, or methacrylate-butylene-styrene copolymer.

[0029] The anti-kink protector 4 is attached so as to cover the portion connecting the first tubular body 10 and the hub 3, and serves to prevent kinking of the first tubular body 10 at that portion. The anti-kink protector 4 is made of an elastic material such as natural rubber or silicone resin.

[0030] Next, the operation of the catheter 1 will be described along with its method of use. First, the surgeon percutaneously inserts the guidewire 100 into a blood vessel using a known method. Next, the surgeon inserts the guidewire 100 into the second lumen 21 of the catheter 1 and, while leading the guidewire 100, pushes the catheter 1 into the blood vessel. As described above, the first tubular body 10 has the tapered portion 12 on the proximal side of the second tubular body 20 having the second lumen 21, so the surgeon can smoothly insert the guidewire 100 into the second lumen 21. The catheter 1 is inserted into the blood vessel so that the direction from the proximal end to the distal end is from the upstream side to the downstream side of the blood flow.

[0031] Once the distal end of the catheter 1 has been inserted to the target site, the surgeon supplies contrast medium from the hub 3 and ejects it into the blood vessel via the first lumen 11. The contrast medium is ejected into the blood vessel from the distal end surface 14 of the first tubular body 10. As described above, the first tubular body 10 has the enlarged diameter portion 13 and the inclined distal end surface 14, allowing for smooth ejection of the contrast medium. Furthermore, the catheter 1 is positioned such that the direction from the base end to the distal end is from the upstream to the downstream side of the blood flow, and therefore blood flows from the base end to the distal end in the second lumen 21. The distal end surface 14 of the first tubular body 10 is located closer to the base end than the distal end of the second tubular body 20 and is disposed within the second lumen 21, ensuring that the contrast medium is ejected along with the blood flow and preventing backflow.

[0032] The second tubular body 20, through which the guidewire 100 is inserted, is provided only at the distal end of the first tubular body 10. Therefore, in order to remove the catheter 1 for replacement or the like while leaving the guidewire 100 in the blood vessel, the guidewire 100 only needs to have a length slightly longer than the distance from the distal end of the catheter main body 2 to the hub 3. When the guidewire 100 is inserted through a lumen and a hub through which a contrast medium flows, the guidewire 100 needs to be at least twice as long as the distance from the distal end of the catheter main body 2 to the hub 3. In comparison, the catheter 1 of this embodiment allows the guidewire 100 to be shorter, thereby reducing the complexity of the procedure.

[0033] Next, a catheter 30 according to a second embodiment will be described. As shown in Fig. 4, the catheter 30 has a catheter main body 31 and a hub 32 provided at the base end of the catheter main body 31. The hub 32 has an anti-kink protector 33 that holds the base end of the catheter main body 31.

[0034] The catheter main body 31 has a first tubular body 40 extending from the hub 32 to the distal end of the catheter main body 31, and a second tubular body 50 extending to the distal end of the first tubular body 40. The second tubular body 50 is shorter in the longitudinal direction than the first tubular body 40. As shown in FIG. 5 , the first tubular body 40 has a first lumen 41 through which a contrast medium flows, and the second tubular body 50 has a second lumen 51 through which a guidewire 100 is inserted. The first tubular body 40 having the first lumen 41 is located outside the second lumen 51. The first lumen 41 has a smaller inner diameter than the second lumen 51.

[0035] The distal end surface 44 of the first tubular body 40 is located at the same position in the longitudinal direction as the distal end surface 54 of the second tubular body 50. However, the distal end surface 44 of the first tubular body 40 may be located closer to the base end than the distal end surface 54 of the second tubular body 50 in the longitudinal direction.

[0036] The hub 32 can be removed from the first tubular body 40. As shown in Fig. 6, the hub 32 can be removed from the first tubular body 40 together with the anti-kink protector 33. It is also possible to remove only the hub 32 while leaving the anti-kink protector 33 fixed to the first tubular body 40.

[0037] The catheter 30 has a detachable hub 32 from the first tubular body 40, which prevents interference between the hub 32 and the guidewire 100 and facilitates replacement or removal of the catheter 30. Furthermore, as with the catheter 1 described above, the second tubular body 50, through which the guidewire 100 is inserted, is provided only at the distal end of the first tubular body 40, allowing the length of the guidewire 100 to be shortened.

[0038] 7, it is also possible to insert a guidewire 100 into the second tubular body 50 and a second guidewire 101 into the first tubular body 40. For this reason, the first lumen 41 of the first tubular body 40 is formed with an inner diameter larger than the outer diameter of the second guidewire 101. Even when two guidewires 100, 101 are inserted into the catheter main body 31 in this way, the detachable hub 32 makes it possible to easily replace and remove the catheter 30.

[0039] Next, a catheter 60 according to a third embodiment will be described. The configuration of the catheter main body 61 of this catheter 60 is similar to that of the catheter 1 shown in Fig. 1, and therefore description thereof will be omitted. The catheter 60 has a hub 62 at its proximal end, and the hub 62 has a kink-resistant protector 63. The hub 62 has a guidewire port 62a through which the guidewire 100 is inserted, and a contrast medium port 62b that communicates with the first tubular body 64. The kink-resistant protector 63 has an opening 63a through which the guidewire 100 is inserted. The guidewire 100 is inserted through the inside of the hub 62 from the opening 63a to the guidewire port 62a.

[0040] A valve body 70 is provided on the base end side of the opening 63a in the kink-resistant protector 63. The valve body 70 is formed in a ring shape from an elastic material, and when the valve body 70 is moved from the tip end side to the base end side of the tapered kink-resistant protector 63, the inner circumferential surface compresses the kink-resistant protector 63 in the radial direction.

[0041] 9(a), the kink-resistant protector 63 has a tubular body lumen 63b through which the first tubular body 64 is inserted, and a guidewire lumen 63c through which the guidewire 100 is inserted. Within the kink-resistant protector 63, the first tubular body 64 is formed of a metal such as stainless steel. Note that within the kink-resistant protector 63, there may be a proximal end tubular body that is a separate member from the first tubular body 64 and is continuous with the first tubular body 64, in which case the proximal end tubular body is formed of a metal.

[0042] As shown in FIG. 9(b), when the kink-resistant protector 63 is compressed radially by the valve body 70, the outer diameter of the kink-resistant protector 63 decreases. The tubular body lumen 63b is not crushed and the first lumen 65 is maintained because the first tubular body 64 inserted into the kink-resistant protector 63 is made of metal. The gap between the guidewire lumen 63c and the inserted guidewire 100 is crushed by the valve body 70. Therefore, the valve body 70 can prevent blood from flowing back from the guidewire lumen 63c. On the other hand, the first lumen 65 through which the contrast medium flows is maintained, so the contrast medium can flow even when the valve body 70 is closed.

[0043] When exchanging or removing the catheter 60 inserted into the blood vessel, the hub 62 and the anti-kink protector 63 can be removed from the first tubular body 64, as in Figure 6. This allows the catheter 60 to be exchanged or removed smoothly without interference between the guide wire 100 and the hub 62.

[0044] The structure in which the valve element 70 presses the anti-kink protector 63 may fix the position of the valve element 70 in the longitudinal direction. As shown in FIG. 10 , this structure includes a holder 80 that houses the valve element 70 and a pressing body 82 that is movable back and forth relative to the holder 80 via a threaded structure. The holder 80 has a holding surface 81 against which the distal end side of the valve element 70 abuts. The pressing body 82 abuts against the proximal end side of the valve element 70. The pressing body 80 is integrally formed with a rotation operation part 83 that is threadedly engaged with the holder 80. By rotating the rotation operation part 83, the pressing body 82 moves toward the holding surface 81, compressing the valve element 70. When the valve element 70 is compressed by the pressing body 82, the kink protector 63 is compressed radially, thereby closing the guidewire lumen 63c.

[0045] The valve body may be provided between the catheter 60 and a guiding catheter into which the catheter 60 is inserted. As shown in FIG. 11 , the guiding catheter 110 has a guiding catheter hub 112 at the proximal end of a long, tubular guiding catheter main body 111. The guiding catheter hub 112 has a tapered inner diameter. The valve body 71 is formed so as to cover the anti-kink protector 63, and has a tapered outer diameter. When the tip of the valve body 71 abuts against the inner circumferential surface of the guiding catheter hub 112, the space between the inner circumferential surface of the guiding catheter main body 111 and the outer circumferential surface of the first tubular body 64 is closed, thereby preventing backflow of blood from this area.

[0046] In this catheter 60, the hub 62 has only a contrast medium port 62b, and the guide wire 100 is exposed on the proximal side from the anti-kink protector 63. Therefore, the guide wire 100 is not inserted inside the hub 62.

[0047] As shown in Figure 12(a), when the valve body 71 is not provided, the guidewire 100 is located outside the anti-kink protector 63. As shown in Figure 12(b), when the valve body 71 is placed, the anti-kink protector 63 is compressed radially, but the first lumen 65 of the first tubular body 64 is maintained. The guidewire 100 is pressed radially inward by the valve body 71, but a gap is formed around the guidewire 100 between the anti-kink protector 63 and the valve body 71. This allows the guidewire 100 to move to a certain extent even when the valve body 71 is fastened.

[0048] As shown in Fig. 13, a valve body 123 may be provided at the proximal end 122 of the guiding catheter 120. In this case, the guidewire 100 exposed at the distal end side from the opening 63a of the kink-resistant protector 63 and the first tubular body 64 are inserted through the valve body 123. As a result, as shown in Fig. 14, a gap is formed around the guidewire 100 between the first tubular body 64 and the valve body 123. This allows the guidewire 100 to move to a certain extent even when the valve body 123 is fastened. Furthermore, by inserting the guidewire 100 into the kink-resistant protector 63, the guidewire 100 can be manipulated while being kept straight, thereby maintaining the pushability of the guidewire 100.

[0049] Since the catheter 60 does not have a guide wire 100 inserted through the first lumen 65 through which the contrast agent flows, nor does the guide wire 100 pass through the inside of the hub 62, the contrast agent can be injected through the contrast agent port 62b and smoothly expelled from the tip of the first tubular body 64.

[0050] A description will now be given of a modified example of the arrangement of lumens at the tip portion of the catheter 1. As shown in Fig. 15, the second tubular body 95 may integrally have the tip portion of the first tubular body 90. The first lumen 91 of the first tubular body 90 and the second lumen 96 of the second tubular body 95 are arranged side by side.

[0051] As shown in FIG. 16(a), the distal end surface 92 of the first tubular body 90 may extend to the distal end surface 97 of the second tubular body 95. In this case, the first lumen 91 is arranged side by side with the second lumen 96 over the entire length of the second tubular body 95. As shown in FIG. 16(b), the distal end surface 92 of the first tubular body 90 may be located inside the second tubular body 95. In this case, the first lumen 91 and the second lumen 96 join together inside the second tubular body 95.

[0052] As described above, the catheter 1 according to the present embodiment (1) has a long first tubular body 10 and a second tubular body 20 extending parallel to the first tubular body 10. The second tubular body 20 is shorter than the first tubular body 10 and extends to the distal end of the first tubular body 10, with the distal end surface 14 of the first tubular body 10 located inside the second tubular body 20. In the catheter (1) configured in this manner, the second tubular body 20 is provided only at the distal end of the first tubular body 10, so the guidewire 100 inserted through the second tubular body 20 can be shortened, reducing the complexity of the procedure. Furthermore, in the catheter 1, the distal end of the first tubular body 10 is located inside the second tubular body 20, so the outer diameter of the distal end of the catheter 1 can be reduced, improving passability through stenotic portions of blood vessels, for example.

[0053] (2) In the catheter 1 described in (1) above, the first tubular body 10 may have a tapered portion 12 whose outer diameter decreases from the base end toward the tip end of the second tubular body 20. This allows the catheter 1 to secure space around the base end of the second tubular body 20, making it easier to insert the guidewire 100 into the second tubular body 20.

[0054] (3) In the catheter 1 described in (2) above, the first tubular body 10 may have an expanded diameter section 13, the inner diameter of which increases from the base end toward the distal end, located distally of the tapered section 12. This allows the catheter 1 to ensure a sufficient flow rate of the fluid flowing through the lumen of the first tubular body 10, and allows the contrast medium or the like to be smoothly discharged from the distal end surface 14.

[0055] (4) In the catheter 1 of any of (1) to (3) above, the distal end surface 14 of the first tubular body 10 may be inclined with respect to a plane perpendicular to the longitudinal direction of the first tubular body 10. This makes it easier for the catheter 1 to eject fluid from the distal end surface 14 of the first tubular body 10, allowing for smooth ejection of a contrast agent or the like.

[0056] The (5) catheter 30 according to this embodiment includes a long first tubular body 40, a second tubular body 50 extending parallel to the first tubular body 40, and a hub 32 provided at the proximal end of the first tubular body 40. The second tubular body 50 has an inner diameter larger than that of the first tubular body 40, is shorter than the first tubular body 40, and extends to the distal end of the first tubular body 40. The hub 32 is detachable from the first tubular body 50. In the (5) catheter 30 configured in this manner, the second tubular body 50 is provided only at the distal end of the first tubular body 40, so the guidewire 100 inserted through the second tubular body 50 can be shortened, thereby reducing the complexity of the procedure. Furthermore, since the hub 32 of the catheter 30 can be detached from the first tubular body 40, interference between the guidewire 100 and the hub 32 can be prevented when exchanging or removing the catheter 30, facilitating the procedure.

[0057] (6) In the catheter 30 described in (5) above, the distal end position of the first tubular body 40 may be closer to the base end than the distal end position of the second tubular body 50. This allows the catheter 30 to have a smaller outer diameter at the distal end, thereby improving passability through narrowed portions of blood vessels, etc.

[0058] (7) In the catheter 60 described in (5) or (6) above, the hub 62 may have a kink-resistant protector 63 that holds the base of the first tubular body 64, and the kink-resistant protector 63 may have a guidewire lumen 63c through which the base end of the guidewire 100, the tip of which is inserted into the second tubular body 66, is inserted. As a result, the catheter 60 is provided with a valve body 70 that radially compresses the kink-resistant protector 63, thereby crushing the guidewire lumen 63c and suppressing bleeding.

[0059] (8) In the catheter of (7) above, a valve body 70 that radially compresses the kink-resistant protector 63 may be provided on the outer periphery of the kink-resistant protector 63, and the first tubular body 64 within the kink-resistant protector 63 or the proximal end tubular body continuous with the first tubular body 64 may be configured to maintain an inner cavity against the pressure of the valve body 70. This allows the catheter 60 to suppress bleeding from the guidewire lumen 63c while allowing fluid such as a contrast medium to flow.

[0060] The present invention is not limited to the above-described embodiment, and various modifications can be made by those skilled in the art within the technical concept of the present invention. [Explanation of symbols]

[0061] 1 catheter 2. Catheter body 3. Hub 4 Anti-kink protector 10 First pipe 11 First Lumen 12 Tapered section 13 Expanded diameter part 14 Tip surface 20 Second body 21 Second Lumen 24 Tip surface 30 catheter 31 catheter body 32 Hub 33 Anti-kink protector 40 First pipe 41 First Lumen 44 Tip surface 50 Second body 51 Second Lumen 54 Tip surface 60 catheters 61 catheter body 62 Hub 63 Anti-kink protector 64 First pipe 65 1st lumen 66 Second pipe 70 Valve body 71 Valve body 80 Holder 81 Holding surface 82 Pressurizing body 83 Rotation control unit 100 Guidewire 101 Second guide wire 110 Guiding catheter 111 guiding catheter main body 112 Hub 120 Guiding Catheter 121 Guiding catheter main body 122 Proximal end 123 Valve body

Claims

1. a long first tubular body; a second pipe extending parallel to the first pipe, the second tube is shorter than the first tube and extends to a tip end of the first tube; A catheter in which the distal end surface of the first tubular body is located inside the second tubular body.

2. 2. The catheter according to claim 1, wherein the first tubular body has a tapered portion whose outer diameter decreases from the proximal end of the second tubular body toward the distal end.

3. The catheter according to claim 2, wherein the first tubular body has an expanded diameter portion distal to the tapered portion, the inner diameter of the lumen of which increases from the base end side to the distal end side.

4. The catheter according to any one of claims 1 to 3, wherein the distal end surface of the first tubular body is inclined with respect to a plane perpendicular to the longitudinal direction of the first tubular body.

5. a long first tubular body; a second pipe extending parallel to the first pipe; a hub provided at a base end of the first tubular body, the second tube has an inner diameter larger than that of the first tube, is shorter than the first tube, and extends to a tip end of the first tube; The catheter wherein the hub is detachable from the first tubular body.

6. The catheter according to claim 5 , wherein the distal end of the first tubular body is located closer to the proximal end than the distal end of the second tubular body.

7. the hub has a kink-resistant protector that holds a base portion of the first tubular body, 7. The catheter according to claim 5, wherein the anti-kink protector has a guidewire lumen through which a proximal end of a guidewire, the distal end of which is inserted through the second tubular body, is inserted.

8. a valve body that compresses the kink-resistant protector in a radial direction is provided on an outer periphery of the kink-resistant protector; The catheter according to claim 7, wherein the first tubular body in the anti-kink protector or the proximal end tubular body continuous with the first tubular body has an inner cavity secured against the pressure of the valve body.

Images