WO2024053202A1

WO2024053202A1 - Catheter

Info

Publication number: WO2024053202A1
Application number: PCT/JP2023/022634
Authority: WO
Inventors: 浩之塩田; 大輔島田
Original assignee: テルモ株式会社
Priority date: 2022-09-08
Filing date: 2023-06-19
Publication date: 2024-03-14

Abstract

Provided is a catheter equipped with a lumen, the lumen being for inserting a guidewire and formed separately from a main lumen, that ensures fluid flow in the main lumen and good replaceability of the guidewire. The catheter 1 has a long first tube 10 and a second tube 20 extending parallel to the first tube 10, wherein: the second tube 20 is shorter than the first tube 10 and extends to the tip of the first tube 10; and the tip surface 14 of the first tube 10 is located inside the second tube 20. The first tube 10 has a tapered part 12 the outer diameter of which decreases from the base side of the second tube 20 toward the tip side.

Description

catheter

The present invention relates to a catheter that discharges a contrast medium within a lumen of a blood vessel or the like.

Procedures using catheters are widely used for diagnosis or treatment within the body lumen. When using a catheter, it is necessary to image the blood vessels. Contrast imaging of blood vessels is performed by discharging a contrast medium from a contrast catheter inserted into the blood vessel.

The contrast catheter has a long tube extending from the distal end to the proximal end. A contrast agent is passed through the lumen of the lumen of the contrast catheter, and a guide wire is inserted into the lumen. In this case, the guide wire needs to have a length that is at least twice the total length of the contrast catheter, making it complicated to insert and remove the contrast catheter into and from the blood vessel.

In addition to the main lumen through which the contrast agent flows, a short guide wire tube with a lumen through which the guide wire is inserted is provided at the tip of the contrast catheter, which allows the guide wire to pass through. It is possible to shorten the length. Patent Document 1 discloses a catheter having a plurality of lumens at the distal end of a tubular body, although it is not used for imaging blood vessels.

US Patent Publication No. 2003/0050600

The contrast catheter must reliably discharge the contrast medium into the blood vessel from the discharge port at its tip and prevent backflow. By providing a lumen through which a guide wire is inserted near the tip of the contrast catheter separate from the main lumen, the flow of the contrast medium may be hindered. Furthermore, the contrast catheter needs to be provided with a hub at its proximal end in order to inject a contrast agent. The presence of the hub complicates the procedure for exchanging the guidewire.

The present invention has been made to solve the above-mentioned problems, and when the lumen through which the guide wire is inserted is provided separately from the main lumen, fluid fluidity in the main lumen is ensured, and the guide wire can be replaced. The purpose of the present invention is to provide a catheter with good performance.

(1) A catheter that achieves the above object has a first elongated tube and a second tube extending parallel to the first tube, and the second tube is connected to the first tube. It is shorter than the body and extends to the distal end of the first tubular body, and the distal end surface of the first tubular body is located inside the second tubular body.

(5) A catheter that achieves the above object includes a first elongated tube, a second tube extending parallel to the first tube, and a hub provided at the proximal end of the first tube. The second tubular body has an inner diameter larger than the inner diameter of the first tubular body, is shorter than the first tubular body, and extends to the distal end of the first tubular body, and the hub is connected to the first tubular body. It is removable from the tube body.

(1) In the catheter configured as described above, the second tube is provided only at the distal end of the first tube, so the guide wire inserted through the second tube can be shortened, which reduces the complexity of the procedure. It can reduce sex. In addition, since the distal end of the first tubular body of the catheter is located inside the second tubular body, the outer diameter of the catheter distal end can be reduced to improve passage through narrowed areas of blood vessels. can.

(2) In the catheter of (1) above, the first tube may have a tapered portion whose outer diameter decreases from the proximal end of the second tube toward the distal end. Thereby, the catheter can secure a space around the proximal end of the second tube, making it easier to insert the guide wire into the second tube.

(3) In the catheter of (2) above, the first tube body may have an enlarged diameter portion on the distal side of the tapered portion, the inner diameter of the lumen increasing from the proximal side to the distal side. . Thereby, the catheter can ensure the flow rate of the fluid flowing through the lumen of the first tube body, and can smoothly discharge the contrast agent and the like from the distal end surface.

(4) In the catheter according to any one of (1) to (3) above, the first tube may have the distal end surface inclined with respect to a plane perpendicular to the longitudinal direction of the first tube. good. Thereby, the catheter can easily discharge fluid from the distal end surface of the first tube body, and can smoothly discharge contrast medium and the like.

(5) In the catheter configured as above, the second tube is provided only at the distal end of the first tube, so the guide wire inserted through the second tube can be shortened, which reduces the complexity of the procedure. It can reduce sex. Further, since the hub of the catheter can be removed from the first tube body, interference between the guide wire and the hub can be prevented when replacing or removing the catheter, making the procedure easier.

(6) In the catheter of (5) above, the distal end position of the first tube may be closer to the proximal end than the distal end position of the second tube. As a result, the outer diameter of the catheter at its tip can be reduced, so that it can pass easily through narrowed areas of blood vessels.

(7) In the catheter according to (5) or (6) above, the hub has an anti-kink protector that holds the base of the first tube, and the tip of the anti-kink protector has a tip attached to the second tube. The guidewire may have a guidewire lumen through which the proximal end of the guidewire is inserted. Accordingly, by providing the catheter with a valve body that compresses the anti-kink protector in the radial direction, it is possible to crush the guide wire lumen and suppress bleeding.

(8) In the catheter according to (7) above, a valve body that compresses the kink-resistant protector in the radial direction is provided on the outer circumference of the kink-resistant protector, and the first tube body in the kink-resistant protector or the The proximal tube body that is continuous with the first tube body may have a lumen secured against the pressure of the valve body. This allows the catheter to flow fluid such as a contrast agent while suppressing bleeding from the guidewire lumen.

FIG. 1 is an overall view of a catheter according to this embodiment. FIG. 2 is an enlarged cross-sectional view of the distal end of the catheter. 3 is a sectional view taken along line AA in FIG. 2. FIG. FIG. 3 is an overall view of a catheter according to a second embodiment. 5 is a sectional view taken along line AA in FIG. 4. FIG. FIG. 2 is an overall view of the catheter with the hub removed with the guidewire inserted. FIG. 2 is an overall view of the catheter with the hub removed, with guide wires inserted through the first lumen and the second lumen, respectively. FIG. 7 is an overall view of a catheter according to a third embodiment. FIG. 8 is a sectional view 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 when the valve body is attached. FIG. 7 is an enlarged view of the vicinity of a hub of a catheter having a compression structure for a valve body according to a modified example. It is an overall view showing a catheter provided with a valve body according to a modified example together with a guiding catheter. FIG. 11 is a sectional view taken along the line AA in FIG. 11, in which (a) shows the state before the valve body is attached, and (b) shows the state when the valve body is attached. FIG. 2 is an overall view of a guiding catheter in which a valve body is provided. 14 is a sectional view taken along line AA in FIG. 13. FIG. FIG. 3 is a cross-sectional view taken along a plane perpendicular to the longitudinal direction of the distal end of the catheter in which the first tube is disposed within the second tube. FIG. 3 is a cross-sectional view along the longitudinal direction of the distal end of a catheter in which the first tube is disposed within the second tube; FIG. (b) is a diagram when the distal end surface of the first tube is arranged inside the second tube.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the dimensions in the drawings may be exaggerated and differ from the actual dimensions for convenience of explanation. Further, in this specification and the drawings, constituent elements having substantially the same functional configuration are designated by the same reference numerals and redundant explanation will be omitted. In this specification, the side of the catheter 1 to be inserted into a blood vessel will be referred to as the "distal end", and the side to be operated will be referred to as the "proximal end".

In the description of this specification, the direction in which the catheter 1 extends in its natural state (straight state with no external force applied) is defined as the "long axis direction." The direction of rotation with the longitudinal direction of the catheter 1 as the reference axis is defined as the "circumferential direction." In addition, the side of the catheter 1 that is inserted into the blood vessel is referred to as the distal end, and the end opposite to the distal end is referred to as the proximal end. In addition, the part that includes a certain range in the long axis direction from the tip (the most distal end) is defined as the "distal part," and the part that includes a certain range in the long axis direction from the proximal end (most proximal end) is called the "base end part." do.

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

The catheter body 2 includes a first tube 10 extending from the hub 3 to the distal end of the catheter body 2, and a first tube 10 extending parallel to the first tube 10 at the distal end of the first tube 10. 2 tube bodies 20. The second tube 20 is shorter than the first tube 10 in the longitudinal direction. The first tubular body 10 can be made of stainless steel or resin such as PEEK (polyetheretherketone). The second tubular body 20 can be made of resin such as polyamide or polyimide. Note that the first tubular body 10 and the second tubular body 20 may be made of materials other than these.

As shown in FIG. 2, the first tube 10 has a first lumen 11 along the long axis direction, and the second tube 20 has a second lumen 21 along the long axis direction. The first lumen 11 allows the contrast agent to flow from the proximal end toward the distal end, and discharges the contrast agent at the distal end surface 14 . The second lumen 21 is used for passing the guide wire 100 through it, and the discharged contrast agent flows out from the distal opening of the second tube body 20 and is also used for angiography.

The first tube 10 has a distal end surface 14 located inside the second lumen 21 inside the second tube 20 . The first tubular body 10 has a tapered portion 12 whose outer diameter decreases from the proximal end of the second tubular body 20 toward the distal end. The inner diameter of the first tubular body 10 also decreases toward the distal end at the tapered portion 12. 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. Further, the inner diameter of the first lumen 11 on the distal side of the tapered part 12 is smaller than the inner diameter of the first lumen 11 on the proximal side of the tapered part 12. Since the first tube 10 has a smaller diameter than the second tube 20 and its distal end is located inside the second tube 20, the outer diameter of the distal end of the catheter 1 can be made small and the narrowed area of the blood vessel can be avoided. The catheter 1 can pass through the catheter 1 easily.

As shown in FIG. 3, at the base end of the second lumen 21, the first tube body 10 is located within the second lumen 21, and the space of the second lumen 21 is correspondingly smaller. Since the first tubular body 10 has the tapered portion 12 on the proximal side of the second tubular body 20, the space on the proximal side of the second lumen 21 of the second tubular body 20 can be increased. Therefore, the second tubular body 20 can sufficiently secure a space for the guide wire 100 to be inserted therethrough, and the guide wire 100 inserted into the second lumen 21 can be smoothly moved.

The first tubular body 10 has an enlarged diameter portion 13 on the distal side of the tapered portion 12, in which the inner diameter of the first lumen 11 increases from the proximal side to the distal side. Further, the distal end surface 14 of the first tubular body 10 is inclined with respect to a plane perpendicular to the longitudinal direction of the first tubular body 10. Since the enlarged diameter portion 13 and the distal end surface 14 are inclined, the contrast medium flowing toward the distal end within the first lumen 11 can be smoothly discharged.

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.

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 made of resin such as polycarbonate, polyamide, polysulfone, polyarylate, methacrylate-butylene-styrene copolymer.

The kink-resistant protector 4 is attached to cover a portion connecting the first tube 10 and the hub 3, and serves to suppress kink of the first tube 10 at that portion. The kink-resistant protector 4 is made of an elastic material such as natural rubber or silicone resin.

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

After inserting the tip of the catheter 1 to the target site, the operator supplies the contrast medium from the hub 3 and discharges the contrast medium into the blood vessel through the first lumen 11. The contrast agent is discharged into the blood vessel from the distal end surface 14 of the first tube body 10. Since the first tubular body 10 has the enlarged diameter portion 13 and the inclined distal end surface 14 as described above, the contrast medium can be smoothly discharged. In addition, since the catheter 1 is arranged 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, blood flows from the proximal end to the distal end in the second lumen 21. is flowing. The distal end surface 14 of the first tubular body 10 is disposed on the proximal side of the distal end of the second tubular body 20 and within the second lumen 21, so that the contrast medium is reliably discharged in the bloodstream. , backflow is suppressed.

The second tube 20 through which the guide wire 100 is inserted is provided only at the distal end of the first tube 10. Therefore, in order to remove the catheter 1 for replacement while leaving the guidewire 100 in the blood vessel, the length of the guidewire 100 is slightly longer than the distance from the tip of the catheter body 2 to the hub 3. It is enough if you have it. When the guide wire 100 is inserted through a lumen and a hub through which a contrast medium flows, the length of the guide wire 100 needs to be at least twice the distance from the tip of the catheter body 2 to the hub 3. Compared to this, in the catheter 1 of this embodiment, the guide wire 100 can be shortened, and the complexity of the procedure can be reduced.

Next, a catheter 30 according to a second embodiment will be explained. As shown in FIG. 4, the catheter 30 includes a catheter main body 31 and a hub 32 provided at the proximal end of the catheter main body 31. The hub 32 has an anti-kink protector 33 that holds the proximal end of the catheter body 31.

The catheter body 31 has a first tube 40 extending from the hub 32 to the distal end of the catheter body 31, and a second tube 50 extending to the distal end of the first tube 40. . The second tube 50 is shorter than the first tube 40 in the longitudinal direction. As shown in FIG. 5, the first tube 40 has a first lumen 41 through which a contrast medium flows, and the second tube 50 has a second lumen 51 through which the guide wire 100 is inserted. The first tube 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.

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

The hub 32 can be removed from the first tube 40. As shown in FIG. 6, the hub 32 can be removed from the first tube 40 together with the anti-kink protector 33. Note that the anti-kink protector 33 may be fixed to the first tube body 40 and only the hub 32 may be removed.

Since the hub 32 of the catheter 30 is removable from the first tube body 40, interference between the hub 32 and the guide wire 100 can be prevented, and the catheter 30 can be easily replaced or removed. Further, like the catheter 1 described above, the second tube 50 through which the guide wire 100 is inserted is provided only at the distal end of the first tube 40, so the guide wire 100 used can be shortened. .

As shown in FIG. 7, the guide wire 100 can be inserted through the second tube 50, and the second guide wire 101 can also be inserted through the first tube 40. For this reason, the first lumen 41 of the first tube 40 is formed to have an inner diameter larger than the outer diameter of the second guide wire 101. In this way, even when two

guide wires

100 and 101 are inserted through the catheter main body 31, since the hub 32 is removable, the catheter 30 can be easily replaced and removed.

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 the same as that of the catheter 1 shown in FIG. 1, so the explanation will be omitted. The catheter 60 has a hub 62 at its proximal end, and the hub 62 has an anti-kink protector 63. The hub 62 has a guide wire port 62 a through which the guide wire 100 is inserted, and a contrast medium port 62 b that communicates with the first tube body 64 . The anti-kink protector 63 has an opening 63a through which the guide wire 100 is inserted. The guide wire 100 is inserted through the hub 62 from the opening 63a to the guide wire port 62a.

The anti-kink protector 63 is provided with a valve body 70 on the proximal side of the opening 63a. The valve body 70 is formed into a ring shape from an elastic material, and is moved from the distal end side to the base end side of the kink-resistant protector 63, which has a tapered shape, so that the inner circumferential surface becomes the kink-resistant protector 63. 63 is compressed in the radial direction.

As shown in FIG. 9(a), the kink-resistant protector 63 has a tube lumen 63b through which the first tube 64 is inserted, and a guide wire lumen 63c through which the guide wire 100 is inserted. In the kink-resistant protector 63, the first tube 64 is made of metal such as stainless steel. Note that the kink-resistant protector 63 may include a proximal tube that is a separate member from the first tube 64 and is continuous with the first tube 64. In this case, the proximal tube is made of metal. It is formed.

As shown in FIG. 9(b), when the anti-kink protector 63 is compressed in the radial direction by the valve body 70, the outer diameter of the anti-kink protector 63 becomes smaller. In the tube lumen 63b, since the first tube 64 inserted through the kink-resistant protector 63 is made of metal, the first lumen 65 is maintained without being crushed. A gap between the guide wire lumen 63c and the inserted guide wire 100 is closed by the valve body 70. Therefore, the valve body 70 can prevent blood from flowing backward from the guide wire lumen 63c. On the other hand, since the first lumen 65 through which the contrast medium flows is maintained, the contrast medium can flow even if the valve body 70 is tightened.

When replacing or removing the catheter 60 inserted into the blood vessel, the hub 62 and the kink-resistant protector 63 can be removed from the first tube body 64, as in FIG. Thereby, the catheter 60 can be smoothly exchanged and removed without interference between the guide wire 100 and the hub 62.

The structure in which the valve body 70 presses the anti-kink protector 63 may be such that the position of the valve body 70 in the longitudinal direction is fixed. As shown in FIG. 10, this structure includes a holding body 80 that accommodates the valve body 70, and a pressing body 82 that can move forward and backward with respect to the holding body 80 by a screw structure. The holding body 80 has a holding surface 81 against which the side surface of the distal end of the valve body 70 comes into contact. The pressing body 82 comes into contact with the proximal side surface of the valve body 70 . The pressing body 80 is integrally formed with a rotary operation section 83 that is screwed into the holding body 80 . By rotating the rotary operation section 83, the pressing body 82 can move toward the holding surface 81 and compress the valve body 70. By being compressed by the pressing body 82, the valve body 70 can compress the anti-kink protector 63 in the radial direction and close the guide wire lumen 63c.

The valve body may be provided between the 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 guiding catheter main body 111 having a long tubular shape. The guiding catheter hub 112 has a tapered inner diameter. The valve body 71 is formed to cover the anti-kink protector 63, and has a tapered outer diameter. When the distal end of the valve body 71 comes into contact with 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 tube body 64 is closed. Backflow of blood from this area can be suppressed.

In this catheter 60, the hub 62 has only a contrast medium port 62b, and the guide wire 100 is exposed from the kink-resistant protector 63 to the proximal end side. Therefore, the guide wire 100 is not inserted into the hub 62.

As shown in FIG. 12(a), the guide wire 100 is located outside the kink protector 63 in a state where the valve body 71 is not provided. As shown in FIG. 12(b), when the valve body 71 is placed, the anti-kink protector 63 is compressed in the radial direction, but the first lumen 65 of the first pipe body 64 is maintained. Although the guide wire 100 is pressed radially inward by the valve body 71, a gap is formed around the guide wire 100 between the anti-kink protector 63 and the valve body 71. Thereby, even when the valve body 71 is tightened, the guide wire 100 can be moved to some extent.

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 guide wire 100 exposed on the distal end side from the opening 63 a of the kink-resistant protector 63 and the first tube body 64 are inserted through the valve body 123 . As a result, as shown in FIG. 14, a gap is formed between the first tubular body 64 and the valve body 123 around the guide wire 100. Thereby, even when the valve body 123 is tightened, the guide wire 100 can be moved to some extent. Further, by inserting the guide wire 100 into the kink-resistant protector 63, it becomes possible to operate the guide wire 100 while keeping it in a straight line, so that the pushability of the guide wire 100 can be maintained.

In the catheter 60, the guide wire 100 is not inserted into the first lumen 65 through which the contrast medium flows, and the guide wire 100 is not inserted into the hub 62, so the contrast medium is passed through the contrast medium port 62b. It can be injected from the tip and smoothly discharged from the tip of the first tube body 64.

A modification of the arrangement of the lumen at the distal end of the catheter 1 will be described. As shown in FIG. 15, the second tubular body 95 may have the distal end portion of the first tubular body 90 integrally. The first lumen 91 of the first tube 90 and the second lumen 96 of the second tube 95 are arranged side by side.

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 in line with the second lumen 96 over the entire length of the second tube body 95. As shown in FIG. 16(b), the distal end surface 92 of the first tube 90 may be located inside the second tube 95. In this case, the first lumen 91 and the second lumen 96 merge inside the second tube 95.

As described above, (1) the catheter 1 according to the present embodiment includes the elongated first tube 10 and the second tube 20 extending parallel to the first tube 10; The body 20 is shorter than the first tubular body 10 and extends to the distal end of the first tubular body 10 , and the distal end surface 14 of the first tubular body 10 is located inside the second tubular body 20 . (1) In the catheter configured in this way, the second tube 20 is provided only at the distal end of the first tube 10, so the guide wire 100 inserted through the second tube 20 can be shortened. The complexity of the procedure can be reduced. In addition, since the distal end of the first tubular body 10 of the catheter 1 is located inside the second tubular body 20, the outer diameter of the distal end of the catheter 1 is made small, allowing for good passage through narrowed areas of blood vessels. It can be done.

(2) In the catheter 1 described in (1) above, the first tube 10 may have a tapered portion 12 whose outer diameter decreases from the proximal end to the distal end of the second tube 20. good. Thereby, the catheter 1 can secure a space around the proximal end of the second tubular body 20 and make it easier to insert the guide wire 100 into the second tubular body 20.

(3) In the catheter 1 described in (2) above, the first tubular body 10 has an enlarged diameter portion 13 on the distal side of the tapered portion 12, the inner diameter of the lumen increasing from the proximal side to the distal side. Good too. Thereby, the catheter 1 can ensure the flow rate of the fluid flowing through the lumen of the first tube body 10, and can smoothly discharge the contrast agent and the like from the distal end surface 14.

(4) In the catheter 1 according to any one of (1) to (3) above, the first tube 10 has a distal end surface 14 inclined with respect to a plane perpendicular to the longitudinal direction of the first tube 10. Good too. Thereby, the catheter 1 can easily discharge fluid from the distal end surface 14 of the first tubular body 10, and can smoothly discharge contrast medium and the like.

(5) The catheter 30 according to the present embodiment includes a long first tube 40, a second tube 50 extending parallel to the first tube 40, and a second tube 50 provided at the proximal end of the first tube 40. The second tubular body 50 has an inner diameter larger than the inner diameter of the first tubular body 40, is shorter than the first tubular body 40, extends to the distal end of the first tubular body 40, and has a hub 32. is removable from the first tube body 50. (5) In the catheter 30 configured in this way, the second tube 50 is provided only at the distal end of the first tube 40, so the guide wire 100 inserted through the second tube 50 can be shortened. , the complexity of the procedure can be reduced. In addition, since the hub 32 of the catheter 30 can be removed from the first tube body 40, interference between the guide wire 100 and the hub 32 is prevented when the catheter 30 is replaced or removed, making the procedure easier. can do.

(6) In the catheter 30 described in (5) above, the distal end position of the first tubular body 40 may be closer to the proximal end than the distal end position of the second tubular body 50. As a result, the outer diameter of the catheter 30 at the tip can be reduced, so that the catheter 30 can pass easily through narrowed portions of blood vessels.

(7) In the catheter 60 of (5) or (6) above, the hub 62 has an anti-kink protector 63 that holds the base of the first tube 64, and the tip of the anti-kink protector 63 has a distal end connected to the second tube. It may have a guide wire lumen 63c through which the proximal end of the guide wire 100 inserted into the body 66 is inserted. Thereby, by providing the valve body 70 that compresses the anti-kink protector 63 in the radial direction, the catheter 60 can crush the guide wire lumen 63c and suppress bleeding.

(8) In the catheter of (7) above, a valve body 70 that compresses the kink-resistant protector 63 in the radial direction is provided on the outer circumference of the kink-resistant protector 63, and the first tube body 64 in the kink-resistant protector 63 Alternatively, the proximal tube body continuous with the first tube body 64 may have a lumen secured against the pressure of the valve body 70. Thereby, the catheter 60 can suppress bleeding from the guide wire lumen 63c while allowing fluid such as a contrast medium to flow.

Note that the present invention is not limited to the embodiments described above, and various modifications can be made by those skilled in the art within the technical idea of the present invention.

Note that this application is based on Japanese Patent Application No. 2022-143112 filed on September 8, 2022, and the disclosures thereof are referenced and incorporated in their entirety.

1 Catheter 2 Catheter main body 3 Hub 4 Anti-kink protector 10 First tubular body 11 First lumen 12 Tapered part 13 Expanded diameter part 14 Distal end surface 20 Second tubular body 21 Second lumen 24 Distal end surface 30 Catheter 31 Catheter main body 32 Hub 33 Anti-kink protector 40 First tubular body 41 First lumen 44 Distal end surface 50 Second tubular body 51 Second lumen 54 Distal end surface 60 Catheter 61 Catheter body 62 Hub 63 Anti-kink protector 64 First tubular body 65 First lumen 66 Second pipe body 70 Valve body 71 Valve body 80 Holding body 81 Holding surface 82 Pressing body 83 Rotating operation section 100 Guide wire 101 Second guide wire 110 Guiding catheter 111 Guiding catheter main body 112 Hub 120 Guiding catheter 121 Guide Catheter main body 122 Proximal end 123 Valve body

Claims

a long first tube body;
a second tube extending parallel to the first tube,
The second tube is shorter than the first tube and extends to the distal end of the first tube,
The distal end surface of the first tube is located inside the second tube.
The catheter according to claim 1, wherein the first tubular body has a tapered portion whose outer diameter decreases from the proximal end side to the distal side from the proximal end of the second tubular body.
3. The catheter according to claim 2, wherein the first tubular body has an enlarged diameter portion distal to the tapered portion, the inner diameter of which increases from the proximal end to the distal end.
The catheter according to any one of claims 1 to 3, wherein the first tube has a distal end surface inclined with respect to a plane perpendicular to a longitudinal direction of the first tube.
a long first tube body;
a second tube extending parallel to the first tube;
a hub provided at the proximal end of the first tube;
The second tubular body has an inner diameter larger than the inner diameter of the first tubular body, is shorter than the first tubular body, and extends to the distal end of the first tubular body,
The catheter wherein the hub is removable from the first tube.
The catheter according to claim 5, wherein the distal end position of the first tubular body is closer to the proximal end than the distal end position of the second tubular body.
The hub has a kink-resistant protector that holds the base of the first tube,
7. The catheter according to claim 5, wherein the kink-resistant protector has a guide wire lumen through which a proximal end portion of a guide wire whose distal end portion is inserted through the second tube body is inserted.
A valve body is provided on the outer circumference of the anti-kink protector and compresses the anti-kink protector in a radial direction,
8. The catheter according to claim 7, wherein the first tube in the anti-kink protector or a proximal tube connected to the first tube has a lumen secured against the pressure of the valve body.