catheter

Abstract

To provide a catheter suppressing dimensional changes in a longitudinal axis direction.SOLUTION: A catheter including a tubular member having a lumen extending in a longitudinal axis direction includes at least two wires extending in the longitudinal axis direction of the tubular member, where a position R1 of one end of the wire and a position R2 of the other end of the wire are within a range of 1 / 8 or less of a circumferential length L of the tubular member in a circumferential direction of the tubular member, and when a straight line passing through a centroid of the tubular member and a centroid of one wire in a vertical cross section of the tubular member in the longitudinal axis direction is defined as AB and a straight line passing through the centroid of the tubular member and perpendicular to the straight line AB is defined as CD, the other wire is disposed in an area opposite to an area where the one wire is disposed with respect to the straight line CD.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Various catheters are used in medical settings. By inserting a catheter into a blood vessel or a body cavity and reaching a target location with its tip, treatments and diagnoses, such as administering or injecting a drug or contrast agent, can be performed. Patent Document 1 discloses such a catheter, which has a deformation region parallel to the catheter lumen and extending in the axial direction, with wires extending parallel to the axial direction of the catheter disposed on the same or opposite side as the deformation region. Patent Document 2 also discloses a catheter equipped with a shape-setting mechanism integrally fixed to at least the tip region of the shaft and formed of a plastically deformable material. It is disclosed that the shape-setting mechanism has a skeleton composed of one or more metal wires, and the skeleton has a plurality of straight wires extending parallel to the axial direction of the shaft and spaced apart in the circumferential direction.

[0003] To insert a catheter into a blood vessel or body cavity, the catheter must be able to conform to the shape of the blood vessel or body cavity, and the tip of the catheter in particular must be flexible. Meanwhile, to navigate the catheter through the blood vessel or body cavity, the catheter must be able to transmit a pushing force (pushability) from the proximal side to the tip. Thus, a catheter must be flexible and rigid enough to transmit a pushing force from the proximal side to the tip. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6426613 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-154631 Summary of the Invention [Problem to be solved by the invention]

[0005] When the tip of a catheter is brought to the target location, a pushing force is applied to the catheter from the proximal side, compressing the catheter in the longitudinal direction. On the other hand, when the catheter is removed from a blood vessel or body cavity, the catheter is pulled toward the proximal side, exerting a force that stretches the catheter in the longitudinal direction. Such compression and stretching reduce the operability of the catheter and must be suppressed.

[0006] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a catheter in which dimensional changes in the longitudinal direction are suppressed. [Means for solving the problem]

[0007] The present invention is as follows. [1] A catheter having a tubular member with an inner cavity extending in the longitudinal axis direction, which has at least two wire rods extending in the longitudinal axis direction of the tubular member, and the position R1 of one end of the wire rods and the position R2 of the other end of the wire rods are within a range of 1 / 8 of the peripheral length L of the tubular member in the circumferential direction of the tubular member, and when a line AB passing through the centroid of the tubular member and the centroid of one of the wire rods in a vertical cross section of the tubular member in the longitudinal axis direction is defined as AB, and a line CD passing through the centroid of the tubular member and perpendicular to the line AB is defined as CD, the other wire rod is arranged in an area opposite the area in which the one wire rod is arranged with respect to the line CD. [2] The catheter according to [1], wherein the ratio of the path length L1 of the wire to the length L2 of the tubular member in the longitudinal direction in the section having the wire is in the range of 100% to 110%. [3] The catheter according to [1] or [2], wherein the diameter of the wire is 2 to 150 μm. [4] The catheter according to any one of [1] to [3], wherein the wire material contains metal and / or resin. [5] A catheter according to any one of [1] to [4], wherein the shape of the outer edge of the wire in a vertical cross section of the tubular member in the longitudinal axis direction is circular, elliptical, oblong, egg-shaped, polygonal, or a combination thereof. [6] The catheter according to any one of [1] to [5], wherein the plurality of wires are arranged at equal intervals in the circumferential direction of the tubular member. [7] A catheter described in any one of [1] to [6], wherein the wire is arranged at least in a region proximal to the center position between the proximal end and the distal end of the tubular member in the longitudinal axis direction of the tubular member. [8] A catheter described in any of [1] to [7], which has an outer layer located radially outside the tubular member, a braided tube or a coil arranged between the tubular member and the outer layer, and the wire arranged radially outside the tubular member and radially inside the braided tube or the coil. [9] A catheter described in any of [1] to [7], which has an outer layer located radially outside the tubular member, a braided tube or a coil is arranged between the tubular member and the outer layer, and the wire is arranged radially outside the braided tube or the coil and radially inside the outer layer.

[10] A catheter as described in [9], wherein an intermediate layer is arranged between the braided tube or the coil and the outer layer, and the wire is arranged radially outside the intermediate layer and radially inside the outer layer.

[11] The catheter according to any one of [1] to

[10] , further comprising a linear member fixed to the tubular member and extending proximally from the tubular member.

[12] The catheter described in

[11] is an extension catheter that has an inner cavity extending in the longitudinal axis direction of the tubular member, is inserted into a second catheter having an opening at its distal end, and can protrude from the opening of the second catheter. [Effects of the Invention]

[0008] The catheter of the present invention has at least two wires extending in the longitudinal axis direction of the tubular member that constitutes the catheter, and these wires are arranged so as to satisfy predetermined conditions in the circumferential direction of the tubular member, thereby providing a catheter in which dimensional change in the longitudinal axis direction is suppressed. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of an embodiment of a catheter. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. [Figure 3] FIG. 3 is a cross-sectional view showing another example of the configuration of the cross-sectional view taken along the line II-II of FIG. [Figure 4] FIG. 4 is a cross-sectional view showing another example of the configuration of the cross-sectional view taken along the line II-II of FIG. [Figure 5] FIG. 5 is a cross-sectional view showing another example of the configuration of the cross-sectional view taken along the line II-II of FIG. [Figure 6] FIG. 6 is a side view showing another embodiment of the catheter. [Figure 7] FIG. 7 is a side view showing the catheter shown in FIG. 6 inserted into a second catheter with a portion of the catheter protruding from the opening at the distal end of the second catheter. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of a catheter according to the present invention is a catheter having a tubular member with an inner lumen extending in the longitudinal axis direction, which has at least two wire rods extending in the longitudinal axis direction of the tubular member, and the position R1 of one end of the wire rods and the position R2 of the other end of the wire rods are within a range of 1 / 8 of the peripheral length L of the tubular member in the circumferential direction of the tubular member, and when a line AB is defined as a line passing through the centroid of the tubular member and one of the wire rods in a vertical cross section of the tubular member in the longitudinal axis direction, and a line CD is defined as a line passing through the centroid of the tubular member and perpendicular to the line AB, the other wire rod is arranged in an area opposite the area in which the one wire rod is arranged with respect to the line CD.

[0011] The present invention will be described in more detail below based on the embodiments, but the present invention is not limited to the following embodiments. Of course, modifications can be made within the scope of the above and below-described purposes, and all such modifications are included within the technical scope of the present invention. In addition, hatching and component symbols may be omitted in the drawings for convenience. In such cases, reference should be made to the specification and other drawings. Furthermore, the dimensions of various components in the drawings may differ from actual dimensions, as priority is given to helping understand the features of the present invention.

[0012] In this specification, the proximal side refers to the direction toward the user's hand in the longitudinal direction, and the distal side refers to the opposite side of the proximal side, i.e., the direction toward the treatment target. Furthermore, when each component is divided into two equal parts along the longitudinal axis, the distal portion of each component is referred to as the distal section, and the proximal portion of each component is referred to as the proximal section. The distal end of each component is the distal-most end of each component, and the proximal end of each component is the proximal-most end of each component. The end of each component refers to the portion including the end of each component and its surroundings. That is, the distal end of each component refers to the portion including the distal end of each component and its surroundings, and the proximal end of each component refers to the portion including the proximal end of each component and its surroundings. In each drawing, the longitudinal axis direction is represented by x, the radial direction by y, and the circumferential direction by z.

[0013] FIG. 1 is a side view showing an embodiment of a catheter. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1. As shown in FIG. 1, the catheter 1 has a tubular member 10 and at least two wires 90 extending in the longitudinal axis direction x of the tubular member 10. Note that in FIG. 1, the wires 90 are shown by dotted lines, and only one wire is shown. The tubular member 10 has an inner lumen extending in the longitudinal axis direction x. As shown in FIG. 2, the wires 90 (90a, 90b) are arranged outside the tubular member 10 in the radial direction y.

[0014] With respect to at least two wire rods 90 arranged on the outside of the cylindrical member 10 in the radial direction y, the position of one end is defined as R1, the position of the other end is defined as R2, and the circumferential length of the cylindrical member 10 in the circumferential direction z is defined as L. The position R1 of one end of the wire rod 90 and the position R2 of the other end in the circumferential direction z of the cylindrical member 10 are within a range of 1 / 8 of the circumferential length L of the cylindrical member 10. In other words, the wire rods 90 extend linearly along the longitudinal axis direction x of the cylindrical member 10. This makes it possible to suppress dimensional change of the catheter 1 in the longitudinal axis direction x. The position R1 of one end of the wire rod 90 and the position R2 of the other end are preferably within a range of 1 / 16 of the circumferential length L of the cylindrical member 10, and more preferably within a range of 1 / 32 of the circumferential length L of the cylindrical member 10.

[0015] When a line AB passing through the centroid of the tubular member 10 and the centroid of one of the wire rods 90a in a vertical cross section of the tubular member 10 in the longitudinal axis direction x is defined as a line AB, and a line CD passing through the centroid of the tubular member 10 and perpendicular to the line AB is defined as a line CD, the other wire rod 90b is disposed in a region opposite the region in which the one wire rod 90a is disposed with respect to the line CD. By disposing the one wire rod 90a and the other wire rod 90b in regions on both sides of the line CD, dimensional change of the catheter 1 in the longitudinal axis direction x can be suppressed.

[0016] The plurality of wire rods 90 may be arranged such that one wire rod 90a and the other wire rod 90b are arranged in regions on both sides of the straight line CD, and when there are three or more wire rods 90, the wire rods 90b may be arranged at non-equidistant intervals in the circumferential direction z of the tubular member 10, but are preferably arranged at equal intervals. By arranging the wire rods at equal intervals, dimensional change in the longitudinal axis direction x of the catheter 1 can be suppressed.

[0017] The path length L1 of the wire rod 90 is not particularly limited, but is preferably K×0.2 to K×0.5, and more preferably K×0.3 to K×0.4, where K is the length x of the tubular member 10 in the longitudinal axis direction. The path length L1 of the wire rod 90 may be the same for all of the wire rods 90, or may be different for some of the wire rods 90. The total length of the tubular member 10 is approximately 1500 mm, depending on the type of catheter, and when the catheter 1 is an extension catheter, which will be described later, the total length of the tubular member 10 is approximately 300 mm.

[0018] The wire rod 90 is preferably linear, preferably extends in the longitudinal axis direction x of the tubular member 10, and preferably does not meander with respect to the longitudinal axis direction x of the tubular member 10. For example, when the path length of the wire rod 90 is L1 and the length of the section of the tubular member 10 in the longitudinal axis direction x of the wire rod 90 (i.e., the distance between the position R1 of one end of the wire rod 90 and the position R2 of the other end of the wire rod 90 with respect to the longitudinal axis direction x of the tubular member 10) is L2, the ratio of the path length L1 to the length L2 is preferably in the range of 100% to 110%. A ratio of the path length L1 to the length L2 of 100% means that the path length L1 and the length L2 are the same. The ratio of the path length L1 is more preferably 108% or less, and even more preferably 106% or less.

[0019] The wire diameter (diameter) of the wire 90 is not particularly limited, but is preferably 2 to 150 μm, more preferably 5 to 100 μm, and even more preferably 10 to 80 μm, for example. The wire diameter of the wire 90 refers to the maximum length (maximum width) of the wire 90 in a cross section perpendicular to the longitudinal axis direction x of the wire 90. The wire diameter of the wire 90 may be the same regardless of the position in the longitudinal axis direction x, or may vary depending on the position in the longitudinal axis direction x, and may, for example, have a portion that tapers from the proximal side to the distal side. The wire diameter of all the wires 90 may be the same, or may vary among some of the wires 90.

[0020] The material constituting the wire 90 is not particularly limited, but preferably includes, for example, a metal and / or a resin. Metals preferably include, for example, stainless steel, titanium, nickel-titanium alloys, nickel-chromium alloys, cobalt-chromium alloys, tungsten alloys, or combinations thereof, and more preferably, stainless steel. Resins preferably include, for example, polyamide resins, polyester resins, polyurethane resins, polyolefin resins, vinyl chloride resins, silicone resins, natural rubber, or combinations thereof, and more preferably, polyamide resins, polyurethane resins, or combinations thereof. Resins may also include elastomers with rubber elasticity; for example, polyamide resins may include polyamide elastomers, and polyurethane resins may include polyurethane elastomers. The materials constituting the wire 90 may be the same for all wires 90, or may be different for some wires 90.

[0021] The shape of the outer edge of the wire rod 90 in a cross section perpendicular to the longitudinal axis direction x of the tubular member 10 is not particularly limited, and may be, for example, a circle, an ellipse, an oval, an oval, a polygon, or a combination thereof. Examples of polygons include a triangle, a rectangle, a pentagon, and a hexagon. Examples of quadrilaterals include a square, a rectangle, and a trapezoid. The shape of the outer edge of the wire rod 90 may be the same for all of the wire rods 90, or may be different for some of the wire rods 90.

[0022] The position where the wire rod 90 is arranged in the longitudinal axis direction x of the tubular member 10 is not particularly limited, but it is preferable that the wire rod 90 be arranged at least in a region proximal to the center position between the proximal end and the distal end of the tubular member 10 in the longitudinal axis direction x of the tubular member 10. By arranging the wire rod 90 in a region proximal to the center position, a pushing force from the proximal side can be transmitted to the distal end side, thereby improving pushability.

[0023] The catheter 1 may have an outer layer 40 located outside the tubular member 10 in the radial direction y, as shown in Fig. 2. When the catheter 1 has the outer layer 40, the wire 90 may be disposed between the tubular member 10 and the outer layer 40, or may be disposed within the outer layer 40, as shown in Fig. 2.

[0024] Fig. 3 is a cross-sectional view showing another example of the configuration of the cross-section taken along line II-II in Fig. 1. Fig. 4 is a cross-sectional view showing another example of the configuration of the cross-section taken along line II-II in Fig. 1. As shown in Fig. 3 or 4, the catheter 1 has an outer layer 40 located outside the tubular member 10 in the radial direction y, and a braided tube 20 may be disposed between the tubular member 10 and the outer layer 40. Although Figs. 3 and 4 show examples in which the braided tube 20 is disposed, a coil may be disposed instead of the braided tube 20.

[0025] The braided tube 20 or the coil may be disposed within the outer layer 40. When the catheter 1 has the outer layer 40 and the braided tube 20 or the coil is disposed within the outer layer 40, the wire 90 may be disposed outside the tubular member 10 in the radial direction y and inside the braided tube 20 or the coil in the radial direction y, as shown in Fig. 3, or may be disposed outside the braided tube 20 or the coil in the radial direction y and inside the outer layer 40 in the radial direction y, as shown in Fig. 4.

[0026] Fig. 5 is a cross-sectional view showing another example of the configuration of the cross-sectional view taken along II-II in Fig. 1. The catheter 1 has an outer layer 40 located outside the tubular member 10 in the radial direction y, and may have an intermediate layer 50 outside the tubular member 10 in the radial direction y and inside the outer layer 40 in the radial direction y. When the catheter 1 has the intermediate layer 50 and the outer layer 40, the catheter 1 may further have a braided tube 20, as shown in Fig. 5. Note that Fig. 5 shows an example of the configuration in which the braided tube 20 is provided, but a coil 30 may be provided instead of the braided tube 20.

[0027] When the catheter 1 has an intermediate layer 50 and an outer layer 40, and further has a braided tube 20 or a coil, as shown in Fig. 5, the braided tube 20 or the coil may be disposed within the intermediate layer 50, and the wire 90 may be disposed within the outer layer 40. Alternatively, the braided tube 20 or the coil may be disposed within the outer layer 40, and the wire 90 may be disposed within the intermediate layer 50. Alternatively, the wire 90 may be disposed outside the intermediate layer 50 in the radial direction y and inside the outer layer 40 in the radial direction y.

[0028] When the catheter 1 has a braided tube 20 or a coil, the wire 90 may be disposed in all or part of the section in which the braided tube 20 or coil is disposed in the longitudinal axis direction x of the tubular member 10. When the wire 90 is disposed in part of the section in which the braided tube 20 or coil is disposed, the wire 90 may be disposed at the distal end of that section, but is preferably disposed at the proximal end. Disposing the wire 90 at the proximal end allows the pushing force from the proximal side to be transmitted to the distal side, improving pushability.

[0029] The outer layer 40 and the intermediate layer 50 preferably contain, for example, polyamide resin, polyester resin, polyurethane resin, polyolefin resin, vinyl chloride resin, silicone resin, natural rubber, or a combination thereof, and more preferably contain polyamide resin, polyurethane resin, or a combination thereof. The resin may contain an elastomer having rubber elasticity; for example, a polyamide resin may contain a polyamide elastomer, and a polyurethane resin may contain a polyurethane elastomer. The outer layer 40 and the intermediate layer 50 may contain different types of resins or the same type of resin.

[0030] The outer layer 40 may be a single layer, or may have a structure in which multiple layers are laminated in the radial direction y of the tubular member 10. When the outer layer 40 has a laminated structure, the layers adjacent to each other in the radial direction y of the tubular member 10 may contain different types of resins, or may contain the same type of resin. The intermediate layer 50 may be a single layer, or may have a structure in which multiple layers are laminated in the radial direction y of the tubular member 10. When the intermediate layer 50 has a laminated structure, the layers adjacent to each other in the radial direction y of the tubular member 10 may contain different types of resins, or may contain the same type of resin.

[0031] The braided tube 20 preferably has a mesh structure in which wires are woven so that they cross each other. The wires may be solid wires or twisted wires. The braided tube 20 may be made up of one or more wires.

[0032] The wires of the braided tube 20 preferably include metal wires, fibers, or a combination thereof, more preferably metal wires. The metal wires preferably include, for example, stainless steel, titanium, nickel-titanium alloys, nickel-chromium alloys, cobalt-chromium alloys, tungsten alloys, or a combination thereof, more preferably stainless steel. The fibers preferably include, for example, polyarylate fibers, aramid fibers, ultra-high molecular weight polyethylene fibers, polyparaphenylene benzobisoxazole fibers (PBO fibers), carbon fibers, or a combination thereof. The fibers may be monofilaments or multifilaments.

[0033] The wires of the braided tube 20 may contain a radiopaque material, which allows the position of the braided tube 20 to be confirmed under X-ray fluoroscopy.

[0034] The radiopaque material preferably includes, for example, lead, barium, iodine, tungsten, gold, platinum, iridium, platinum-iridium alloy, stainless steel, titanium, cobalt-chromium alloy, palladium, tantalum, or a combination thereof.

[0035] The shape of the cross section perpendicular to the longitudinal axis direction x of the wire of the braided tube 20 is not particularly limited, and may be, for example, a circle, an ellipse, an oval, an egg, a D-shape, a triangle, a rectangle, a polygon, or a combination thereof. The braided tube 20 may also be made of a round wire or a flat wire. A flat wire is a wire material with both sides scraped off from a round wire.

[0036] The wire diameter of the wire of the braided tube 20 is, for example, preferably 5 to 110 μm, more preferably 10 to 100 μm, and even more preferably 15 to 90 μm. The wire diameter refers to the maximum length (maximum width) of the wire in a cross section of the braided tube 20 perpendicular to the longitudinal axis direction x of the wire.

[0037] The coil may be a solid wire or a stranded wire.

[0038] The coil preferably comprises a metal wire, a fiber, or a combination thereof, more preferably a metal wire. The metal wire preferably comprises, for example, stainless steel, titanium, a nickel-titanium alloy, a nickel-chromium alloy, a cobalt-chromium alloy, a tungsten alloy, or a combination thereof, more preferably stainless steel. The fiber preferably comprises, for example, a polyarylate fiber, an aramid fiber, an ultra-high molecular weight polyethylene fiber, a polyparaphenylene benzobisoxazole fiber (PBO fiber), a carbon fiber, or a combination thereof. The fiber may be a monofilament or a multifilament.

[0039] The coil may include a radiopaque material, which allows the coil's position to be confirmed under fluoroscopy. The radiopaque material preferably includes, for example, lead, barium, iodine, tungsten, gold, platinum, iridium, platinum-iridium alloy, stainless steel, titanium, cobalt-chromium alloy, palladium, tantalum, or a combination thereof.

[0040] The shape of the cross section perpendicular to the longitudinal axis direction x of the coil is not particularly limited, and examples thereof include a circle, an ellipse, an oval, an egg, a D-shape, a triangle, a rectangle, a polygon, or a combination thereof. The coil may also be made of a round wire or a flat wire. A flat wire is a round wire with both sides scraped off.

[0041] The wire diameter of the coil is, for example, preferably 3 to 300 μm, more preferably 5 to 250 μm, and even more preferably 10 to 200 μm. The wire diameter of the coil refers to the maximum length (maximum width) of the coil in a cross section perpendicular to the longitudinal axis direction x of the coil.

[0042] The cylindrical member 10 may be any resin tube, preferably containing a fluororesin, and more preferably made of a fluororesin. Fluororesin has excellent chemical resistance, non-stickiness, and low friction. The fluororesin preferably contains, for example, polytetrafluoroethylene, ethylene tetrafluoroethylene, fluorinated ethylene propylene, or a combination thereof.

[0043] The catheter 1 may have a radiopaque ring. The proximal or distal end of the braided tube 20 may be located inside the radiopaque ring in the radial direction y. This allows the position of the proximal or distal end of the braided tube 20 to be confirmed under X-ray fluoroscopy. The radiopaque ring may be located between the braided tube 20 or the coil and the outer layer 40 in the radial direction y of the tubular member 10. This prevents the end of the braided tube 20 from opening, thereby preventing the braided tube 20 or the coil from being exposed from the outer surface of the outer layer 40. The radiopaque ring is a ring containing a radiopaque material, and may be a ring made of a radiopaque material. The radiopaque materials exemplified above can be used.

[0044] The use of the catheter is not particularly limited as long as it can be inserted into a blood vessel or a body cavity, and may be, for example, a blood vessel, a ureter, a bile duct, a fallopian tube, or a hepatic duct.

[0045] Fig. 6 is a side view showing another embodiment of the catheter. Fig. 7 is a side view showing the catheter shown in Fig. 6 inserted into a second catheter with a portion of the catheter protruding from the opening at the distal end of the second catheter.

[0046] The catheter 1 may further include a linear member 60 fixed to the tubular member 10 and extending proximally from the tubular member 10. This allows the operator to push the tubular member 10 distally or pull it back proximally via the linear member 60.

[0047] The linear member 60 may have a lumen extending in the longitudinal axis direction x, but is preferably solid and does not have a lumen, which allows the thickness of the linear member 60 to be reduced.

[0048] The linear member 60 may be made of any material, including, but not limited to, metal, as long as it can push the tubular member 10 distally and pull it back proximally. Metals preferably include, for example, stainless steel, titanium, nickel-titanium alloys, cobalt-chromium alloys, tungsten alloys, or combinations thereof, and more preferably include stainless steel.

[0049] The shape of the linear member 60 in a cross section perpendicular to the longitudinal axis direction x is preferably, for example, a square, rectangle, trapezoid, circle, D-shape, ellipse, egg shape, or oval shape, and more preferably a rectangle. The shape of the linear member 60 in a cross section perpendicular to the longitudinal axis direction x may be the same regardless of the position in the longitudinal axis direction x, or may be different depending on the position in the longitudinal axis direction x.

[0050] The wire diameter of the linear member 60 is, for example, preferably 100 to 650 μm, more preferably 150 to 600 μm, and even more preferably 200 to 550 μm. The wire diameter of the linear member 60 refers to the maximum length (maximum width) of the linear member 60 in a cross section perpendicular to the longitudinal axis direction x of the linear member 60. The wire diameter of the linear member 60 may be the same regardless of the position in the longitudinal axis direction x, or may be different depending on the position in the longitudinal axis direction x, and may have, for example, a portion that tapers from the proximal side to the distal side.

[0051] When the catheter 1 further has a linear member 60, the catheter 1 may be an extension catheter 1A, as shown in Fig. 7. As shown in Fig. 7, the extension catheter 1A has a lumen extending in the longitudinal axis direction x of the tubular member 10, and is a catheter to be inserted into a second catheter 2 having an opening 2bP at its distal end 2b, and is a catheter that can protrude from the opening 2bP at the distal end 2b of the second catheter 2.

[0052] For example, after inserting the distal end of the second catheter 2 into the entrance of the coronary artery, the extension catheter 1A is inserted into the second catheter 2 from an opening 2aP on the proximal side of the second catheter 2, and then inserted into the coronary artery with a portion of the extension catheter 1A protruding from an opening 2bP at the distal end 2b of the second catheter 2, thereby enabling delivery of, for example, an intravascular treatment device to an affected area in the coronary artery via the second catheter 2 and the extension catheter 1A. Examples of intravascular treatment devices include a balloon and a stent.

[0053] The second catheter 2 is preferably a so-called guiding catheter. A guiding catheter has a lumen into which a treatment catheter such as a balloon catheter or a stent delivery catheter is inserted. The treatment catheter is preferably one that is inserted into a coronary artery, but may also be one that is inserted into other arteries such as a cerebral artery, or into internal ducts such as veins, pancreatic ducts, bile ducts, ureters, and bronchi.

[0054] The catheter 1 may further have a handle member 70 fixed to the proximal end of the tubular member 10. When the catheter 1 is an extension catheter 1A having a linear member 60, the extension catheter 1A may further have a handle member 70 fixed to the proximal end of the linear member 60, as shown in Fig. 7. The operator can grasp the handle member 70 to move the tubular member 10 or the linear member 60 distally or proximally.

[0055] The handle member 70 preferably contains a resin, such as a polyolefin resin, which preferably contains, for example, polyethylene, polypropylene, or a combination thereof. [Explanation of symbols]

[0056] 1 catheter 1A Extension Catheter 2. Second catheter 2a Proximal end of second catheter 2b Distal end of second catheter 2aP Opening at the proximal end of the second catheter 2bP Opening at the distal end of the second catheter 10 Cylindrical member 10a Proximal end of tubular member 10b distal end of tubular member 40 outer layer 50 Middle Class 60 Linear members 60b Distal end of linear member 70 Handle member 90, 90a, 90b wire rod x longitudinal axis y radial direction z Circumferential direction

Claims

1. A catheter having a tubular member with a lumen extending in a longitudinal direction, The cylindrical member has at least two wire rods extending in the longitudinal axis direction, a position R1 of one end of the wire rod and a position R2 of the other end of the wire rod are within a range of ⅛ of a circumferential length L of the cylindrical member in the circumferential direction of the cylindrical member; and A catheter in which, when a line AB passes through the centroid of the tubular member and the centroid of one of the wire rods in a vertical cross section of the tubular member in the longitudinal axis direction, and a line CD passes through the centroid of the tubular member and is perpendicular to the line AB, the other wire rod is arranged in an area opposite the area in which the one wire rod is arranged with respect to the line CD.

2. 2. The catheter according to claim 1, wherein the ratio of the path length L1 of the wire to the length L2 of the tubular member in the longitudinal direction in the section having the wire is in the range of 100% to 110%.

3. 2. The catheter according to claim 1, wherein the wire has a diameter of 2 to 150 μm.

4. The catheter according to claim 1 , wherein the wire material includes a metal and / or a resin.

5. The catheter according to claim 1, wherein the shape of the outer edge of the wire in a cross section perpendicular to the longitudinal axis direction of the tubular member is a circle, an ellipse, an oval, an egg, a polygon, or a combination thereof.

6. The catheter according to claim 1 , wherein the plurality of wires are arranged at equal intervals in the circumferential direction of the tubular member.

7. The catheter according to claim 1 , wherein the wire is disposed at least in a region proximal to a midpoint between the proximal end and the distal end of the tubular member in the longitudinal axis direction of the tubular member.

8. an outer layer located radially outside the cylindrical member, a braided tube or coil is disposed between the tubular member and the outer layer; The catheter according to claim 1 , wherein the wire is disposed radially outside the tubular member and radially inside the braided tube or the coil.

9. an outer layer located radially outside the cylindrical member, a braided tube or coil is disposed between the tubular member and the outer layer; The catheter according to claim 1 , wherein the wire is disposed radially outside the braided tube or the coil and radially inside the outer layer.

10. an intermediate layer is disposed between the braided tube or the coil and the outer layer; The catheter according to claim 9 , wherein the wire is disposed radially outside the intermediate layer and radially inside the outer layer.

11. The catheter according to claim 1, further comprising a linear member fixed to the tubular member and extending proximally from the tubular member.

12. 12. The catheter according to claim 11, wherein the catheter is an extension catheter that has an inner cavity extending in the longitudinal axis direction of the tubular member, is inserted into a second catheter having an opening at its distal end, and is capable of protruding from the opening of the second catheter.

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