catheter

Abstract

To provide a catheter that is less prone to buckling and has good pushability. [Solution] A catheter 100 comprising: a first cylindrical portion 10 having a longitudinal direction x and comprising a first lumen 101 and a second lumen 102 extending in the longitudinal direction x; a second cylindrical portion 20 located proximal to the first cylindrical portion 10 and having a circumference smaller than the circumference of the first cylindrical portion 10, comprising a third lumen 20e communicating with the first lumen 101 and not communicating with the second lumen 102, and extending in the longitudinal direction x of the first cylindrical portion 10; and a first core wire 41 having a first helical portion 41r, wherein the first helical portion 41r is located proximal to the first cylindrical portion 10, and the first helical portion 41r is wound around the second cylindrical portion 20 at a pitch P of 80 mm or more.

Description

Technical Field

[0001] The present invention relates to a catheter.

Background Art

[0002] Conventionally, various catheters have been developed. For example, in Patent Document 1, there is described a catheter including an outer tube, an inner tube inserted into the outer tube, a first core wire inserted between the outer tube and the inner tube and fixed to the outer tube or the inner tube, and a second core wire inserted in parallel with the first core wire and movable between the outer tube and the inner tube.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, with respect to the catheter described in Patent Document 1, there is still room for improvement from the viewpoints of preventing buckling and improving pushability.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a catheter that is easy to prevent buckling and has good pushability.

Means for Solving the Problems

[0006] The catheter according to an embodiment of the present invention that has solved the above problems is as follows. [1] A first cylindrical portion having a longitudinal direction and including a first lumen and a second lumen extending in the longitudinal direction, A second cylindrical portion is located proximal to the first cylindrical portion and has a circumference smaller than the circumference of the first cylindrical portion, and comprises a third lumen that communicates with the first lumen but not with the second lumen, and the second cylindrical portion extends in the longitudinal direction, A first core wire having a first helical portion, wherein the first helical portion is located proximal to the first cylindrical portion, It has, The catheter is characterized in that the first helical portion is wound around the second tubular portion at a pitch of 80 mm or more.

[0007] The first helical section of the first core wire has a loose pitch of 80 mm or more, which allows the force transmitted at the proximal end of the first core wire to be easily transmitted to the distal end, contributing to improved pushability. In addition, because the first helical section is wound around the second cylindrical section, it becomes easier to prevent buckling of the second cylindrical section.

[0008] The catheter according to the embodiment of the present invention is preferably one of the following [2] to

[15] . [2] The catheter according to [1], wherein the pitch of the first helical portion is 1500 mm or less. [3] The catheter according to [1] or [2], wherein the number of turns of the helix in the first helical portion is 1 or more and 20 or less. [4] A second core wire having a second helical portion, wherein the second helical portion is located more proximal to the first cylindrical portion, The catheter according to any one of the following [1] to [3], wherein the second helical portion is wound around the second tubular portion at a pitch of 80 mm or more. [5] The catheter according to [4], wherein the pitch of the second helical portion is 1500 mm or less. [6] The catheter according to [4] or [5], wherein the number of turns of the helix in the second helical portion is 1 or more and 20 or less. [7] The catheter according to any one of the items [4] to [6], wherein the pitch of the first helical portion and the pitch of the second helical portion are different. [8] The catheter according to any one of the items [4] to [7], wherein the distal end of the first core wire is positioned distal to the distal end of the second core wire. [9] The catheter according to any one of [4] to [8], wherein at least a portion of the distal portion of the first core wire is fixed to the first tubular portion, and the distal portion of the second core wire is not fixed to the first tubular portion.

[10] The catheter according to any one of the items [1] to [9], wherein the distal end of the first core wire is not fixed to the first tubular portion.

[11] The catheter according to any one of the claims [4] to [9], wherein at least a portion of the distal part of the first core wire and at least a portion of the distal part of the second core wire are fixed to the first tubular part.

[12] The catheter according to

[11] , wherein the distal end of the first core wire and the distal end of the second core wire are not fixed to the first tubular portion.

[13] The catheter according to any one of the items [1] to

[12] , wherein the first lumen and the second lumen are aligned radially in the first cylindrical portion.

[14] A catheter according to any one of [1] to

[13] , comprising a third tubular portion located proximal to the first tubular portion, the third tubular portion having a fourth lumen in which the second tubular portion is located, and having the third tubular portion extending in the longitudinal direction.

[15] The catheter according to

[14] , wherein the first core wire is positioned between the second tubular portion and the third tubular portion. [Effects of the Invention]

[0009] The first helical section of the first core wire has a loose pitch of 80 mm or more, which allows the force transmitted at the proximal end of the first core wire to be easily transmitted to the distal end, contributing to improved pushability. In addition, because the first helical section is wound around the second cylindrical section, it becomes easier to prevent buckling of the second cylindrical section. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 shows a side view of a catheter according to an embodiment of the present invention. [Figure 2] Figure 2 shows a cross-sectional view of the catheter shown in Figure 1. [Figure 3] Figure 3 shows a cross-sectional view illustrating a modified version of the catheter shown in Figure 2. [Figure 4] Figure 4 shows the end view of the section along line IV-IV shown in Figure 3. [Figure 5] Figure 5 shows a cross-sectional view illustrating a modified version of the catheter shown in Figure 2. [Figure 6] Figure 6 shows the end view of the section along the line VI-VI shown in Figure 5. [Modes for carrying out the invention]

[0011] The present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the illustrated examples, and it is possible to implement it with appropriate modifications within the scope that is consistent with the spirit described above and below, and all such modifications are included within the technical scope of the present invention. In each drawing, hatching and reference numerals may be omitted for convenience, in which case refer to the specification or other drawings. Also, the dimensions of various parts in the drawings may differ from the actual dimensions, as priority is given to helping to understand the features of the present invention.

[0012] A catheter according to an embodiment of the present invention has a longitudinal direction and includes a first cylindrical portion having a first lumen and a second lumen extending in the longitudinal direction, and a second cylindrical portion disposed more proximally than the first cylindrical portion and having a circumference smaller than the circumference of the first cylindrical portion. The second cylindrical portion has a third lumen that communicates with the first lumen and does not communicate with the second lumen, and extends in the longitudinal direction of the first cylindrical portion. The catheter also has a first core wire having a first helical portion, and the first helical portion is disposed more proximally than the first cylindrical portion. The gist of the invention lies in that the first helical portion is wound around the second cylindrical portion with a pitch of 80 mm or more.

[0013] Referring to FIGS. 1 to 6, the overall configuration of the catheter according to the embodiment of the present invention will be described. In FIGS. 1 to 6, a catheter 100 having a first cylindrical portion 10, a second cylindrical portion 20, and a first core wire 41 is shown.

[0014] In this drawing, the longitudinal direction of the first cylindrical portion 10 is indicated by x, the radial direction of the first cylindrical portion 10 is indicated by y, and the circumferential direction of the first cylindrical portion 10 is indicated by c. The radial direction y is a direction perpendicular to the longitudinal direction x. In other words, the longitudinal direction x of the first cylindrical portion 10 can also be said to be the extending direction of the first cylindrical portion 10. For ease of understanding, in this drawing, the longitudinal direction x of the first cylindrical portion 10, the longitudinal direction of the second cylindrical portion 20, and the longitudinal direction of a third cylindrical portion 30 to be described later are the same, the radial direction y of the first cylindrical portion 10, the radial direction of the second cylindrical portion 20, and the radial direction of the third cylindrical portion 30 are the same, and the circumferential direction c of the first cylindrical portion 10, the circumferential direction of the second cylindrical portion 20, and the circumferential direction of the third cylindrical portion 30 are the same. However, the present invention is not limited to this aspect.

[0015] In this specification, the proximal side refers to the direction toward the user's hand relative to the longitudinal direction x of the first cylindrical portion 10, and the distal side refers to the opposite side of the proximal side, i.e., the direction toward the treatment target. Furthermore, when each member or part is divided into two equal parts along the longitudinal direction x of the first cylindrical portion 10, the part located on the distal side of each member or part is called the distal part, and the part located on the proximal side of each member or part is called the proximal part. The distal end of each member or part is the end located furthest distally from each member or part. The proximal end of each member or part is the end located furthest proximal from each member or part. The end of each member or part refers to the part including the end of each member or part and its surroundings. That is, the distal end of each member or part refers to the part including the distal end of each member or part and its surroundings, and the proximal end of each member or part refers to the part including the proximal end of each member or part and its surroundings.

[0016] As shown in Figures 1 to 6, the catheter 100 has a first cylindrical portion 10, a second cylindrical portion 20, and a first core wire 41.

[0017] The first cylindrical portion 10 has a longitudinal direction x and includes a first lumen 101 extending in the longitudinal direction x and a second lumen 102 extending in the longitudinal direction x.

[0018] The second cylindrical portion 20 is located proximal to the first cylindrical portion 10. At least a portion of the second cylindrical portion 20 needs to be located proximal to the first cylindrical portion 10; only a portion of the second cylindrical portion 20 may be located proximal to the first cylindrical portion 10, or the entire second cylindrical portion 20 may be located proximal to the first cylindrical portion 10. The second cylindrical portion 20 has a circumference smaller than the circumference of the first cylindrical portion 10. The second cylindrical portion 20 includes a third lumen 20e that communicates with the first lumen 101 but not with the second lumen 102. The second cylindrical portion 20 extends in the longitudinal direction x of the first cylindrical portion 10. It is preferable that the second cylindrical portion 20 does not have a lumen that communicates with the second lumen 102.

[0019] The first core wire 41 has a first helical portion 41r. The first helical portion 41r is located proximal to the first cylindrical portion 10. The entire first helical portion 41r may be located proximal to the first cylindrical portion 10, or only a part of the first helical portion 41r may be located proximal to the first cylindrical portion 10. The first helical portion 41r is wound around the second cylindrical portion 20 at a pitch P of 80 mm or more.

[0020] The first helical portion 41r of the first core wire 41 has a loose pitch P of 80 mm or more, which makes it easier for the force transmitted at the proximal end of the first core wire 41 to be transmitted to the distal end of the first core wire 41, thus contributing to improved pushability. In addition, because the first helical portion 41r is wound around the second cylindrical portion 20, it becomes easier to prevent buckling of the second cylindrical portion 20.

[0021] Since the first cylindrical portion 10 is inserted into the body, it is preferably flexible. This allows the first cylindrical portion 10 to deform to conform to the shape of the body cavity. Furthermore, to maintain its shape, it is preferable that the first cylindrical portion 10 is elastic.

[0022] The first cylindrical portion 10 can be made of synthetic resins such as polyolefin resin (e.g., polyethylene or polypropylene), polyamide resin (e.g., nylon), polyester resin (e.g., PET), aromatic polyetherketone resin (e.g., PEEK), polyetherpolyamide resin, polyurethane resin, polyimide resin, or fluororesin (e.g., PTFE, PFA, ETFE), or metals such as stainless steel, carbon steel, or nickel-titanium alloy. For example, polyamide resin may contain polyamide elastomer, and polyurethane resin may contain polyurethane elastomer. Only one of these may be used, or two or more may be used in combination.

[0023] The outer surface 10d of the first cylindrical portion 10 may be coated. The coating may be applied to only a portion of the outer surface 10d of the first cylindrical portion 10, or to the entire surface.

[0024] The coating applied to the outer surface 10d of the first cylindrical portion 10 can be a hydrophilic coating or a hydrophobic coating, depending on the purpose. The coating can be applied by immersing the first cylindrical portion 10 in a hydrophilic coating agent or a hydrophobic coating agent, applying a hydrophilic coating agent or a hydrophobic coating agent to the outer surface 10d of the first cylindrical portion 10, or covering the outer surface 10d of the first cylindrical portion 10 with a hydrophilic coating agent or a hydrophobic coating agent. Chemicals or additives may be added to the coating agent.

[0025] Examples of hydrophilic coating agents include hydrophilic polymers such as polyvinyl alcohol, polyethylene glycol, polyacrylamide, polyvinylpyrrolidone, and methyl vinyl ether maleic anhydride copolymer, or hydrophilic coating agents composed of combinations thereof.

[0026] Examples of hydrophobic coating agents include polytetrafluoroethylene (PTFE), ethylene fluoride propylene (FEP), perfluoroalkoxyalkanes (PFA), silicone oil, hydrophobic urethane resins, carbon coatings, diamond coatings, diamond-like carbon (DLC) coatings, ceramic coatings, and substances with low surface free energy terminated with alkyl groups or perfluoroalkyl groups.

[0027] The distal end of the second cylindrical portion 20 may be connected to the proximal end of the first cylindrical portion 10. The distal end of the second cylindrical portion 20 may be fixed to the proximal end of the first cylindrical portion 10.

[0028] The second cylindrical portion 20 is preferably flexible because it is inserted into the body. This allows the second cylindrical portion 20 to deform to conform to the shape of the body cavity. Furthermore, it is preferable that the second cylindrical portion 20 is elastic in order to maintain its shape.

[0029] As materials that can constitute the second cylindrical portion 20, the same materials listed as those that can constitute the first cylindrical portion 10 can be used.

[0030] Furthermore, the outer surface of the second cylindrical portion 20 may be coated. The coating may be applied to only a part of the outer surface of the second cylindrical portion 20, or to the entire surface. As a coating that can be applied to the outer surface of the second cylindrical portion 20, the coatings exemplified as coatings that can be applied to the outer surface 10d of the first cylindrical portion 10 can be used.

[0031] As shown in Figures 1 to 3 and Figure 5, the catheter 100 may have a hub 1. As shown in Figures 1 to 3, the hub 1 may be connected to the proximal part of the third cylindrical portion 30. The hub 1 may be fixed to the third cylindrical portion 30. The hub 1 can be fixed by adhesive bonding, welding, screws, etc.

[0032] Preferably, the proximal end of the first core wire 41 extends to the hub 1. Preferably, the proximal end of the first core wire 41 is fixed to the hub 1.

[0033] As shown in Figures 2, 3, and 5, the first core wire 41 may have a portion that extends in a straight line.

[0034] The pitch P of the first helical portion 41r may be 85 mm or more, 90 mm or more, or 95 mm or more. This makes it easier for the force transmitted at the proximal end of the first core wire 41 to be transmitted to the distal end of the first core wire 41, thereby contributing to improved pushability.

[0035] The pitch P of the first helical portion 41r may be 1500 mm or less, 1400 mm or less, or 1300 mm or less. This makes it easier to prevent buckling of the second cylindrical portion 20.

[0036] The number of turns of the helix in the first helical portion 41r is preferably 1 or more, more preferably 5 or more, and even more preferably 10 or more. The number of turns of the helix in the first helical portion 41r is preferably 20 or less, more preferably 18 or less, and even more preferably 16 or less. This makes it easier for the force transmitted at the proximal end of the first core wire 41 to be transmitted to the distal end of the first core wire 41, contributing to improved pushability. It also makes it easier to prevent buckling of the second cylindrical portion 20.

[0037] As shown in Figures 3, 5, and 6, the catheter 100 may have a second core wire 42.

[0038] It is preferable that the proximal end of the second core wire 42 extends to the hub 1. It is also preferable that the proximal end of the second core wire 42 is fixed to the hub 1.

[0039] As shown in Figure 5, the second core wire 42 may have a portion that extends in a straight line.

[0040] The second core wire 42 has a second helical portion 42r, and it is preferable that the second helical portion 42r is located proximal to the first cylindrical portion 10. The entire second helical portion 42r may be located proximal to the first cylindrical portion 10, or only a part of the second helical portion 42r may be located proximal to the first cylindrical portion 10.

[0041] Preferably, the second helical portion 42r is wound around the second cylindrical portion 20 with a pitch P of 80 mm or more. Having a loose pitch P of 80 mm or more in the second helical portion 42r of the second core wire 42 makes it easier for the force transmitted at the proximal end of the second core wire 42 to be transmitted to the distal end of the second core wire 42, thus contributing to improved pushability. In addition, the winding of the second helical portion 42r around the second cylindrical portion 20 makes it easier to prevent buckling of the second cylindrical portion 20.

[0042] The pitch P of the second helical portion 42r may be 85 mm or more, 90 mm or more, or 95 mm or more. This makes it easier for the force transmitted at the proximal end of the second core wire 42 to be transmitted to the distal end of the second core wire 42, thereby contributing to improved pushability.

[0043] Furthermore, the pitch P of the second helical portion 42r may be 1500 mm or less, 1400 mm or less, or 1300 mm or less. This makes it easier to prevent buckling of the second cylindrical portion 20.

[0044] The number of turns of the helix in the second helical portion 42r is preferably 1 or more, more preferably 5 or more, and even more preferably 10 or more. The number of turns of the helix in the second helical portion 42r is preferably 20 or less, more preferably 18 or less, and even more preferably 16 or less. This makes it easier for the force transmitted at the proximal end of the second core wire 42 to be transmitted to the distal end of the second core wire 42, contributing to improved pushability. It also makes it easier to prevent buckling of the second cylindrical portion 20.

[0045] As shown in Figure 3, the pitch P of the first helical portion 41r and the pitch P of the second helical portion 42r may be different. The pitch P of the first helical portion 41r may be greater than the pitch P of the second helical portion 42r. Although not shown, the pitch P of the first helical portion 41r may be smaller than the pitch P of the second helical portion 42r. As shown in Figure 5, the pitch P of the first helical portion 41r and the pitch P of the second helical portion 42r may be the same length.

[0046] The winding direction of the first helical portion 41r and the winding direction of the second helical portion 42r may be the same or different. The winding direction of the first helical portion 41r may be right-handed, and the winding direction of the second helical portion 42r may be right-handed. The winding direction of the first helical portion 41r may be left-handed, and the winding direction of the second helical portion 42r may be left-handed. The winding direction of the first helical portion 41r may be right-handed, and the winding direction of the second helical portion 42r may be left-handed. The winding direction of the first helical portion 41r may be left-handed, and the winding direction of the second helical portion 42r may be right-handed. Note that the winding direction of the helix should be observed from the distal side.

[0047] The first core wire 41 constituting the first helical portion 41r and the second core wire 42 constituting the second helical portion 42r may have contact points. The contact points between the first core wire 41 constituting the first helical portion 41r and the second core wire 42 constituting the second helical portion 42r may be one or multiple locations. Furthermore, the first core wire 41 constituting the first helical portion 41r and the second core wire 42 constituting the second helical portion 42r may intersect. The intersection points between the first core wire 41 constituting the first helical portion 41r and the second core wire 42 constituting the second helical portion 42r may be one or multiple locations. Having such a configuration makes it easier to prevent buckling of the second cylindrical portion 20.

[0048] As shown in Figures 3 and 5, the position of the distal end 41a of the first core wire 41 in the longitudinal direction x of the first cylindrical portion 10 and the position of the distal end 42a of the second core wire 42 in the longitudinal direction x of the first cylindrical portion 10 may be different. The distal end 41a of the first core wire 41 may be positioned distal to the distal end 42a of the second core wire 42. Although not shown, the position of the distal end 41a of the first core wire 41 in the longitudinal direction x of the first cylindrical portion 10 and the position of the distal end 42a of the second core wire 42 in the longitudinal direction x of the first cylindrical portion 10 may be the same.

[0049] As shown in Figures 3 and 4, at least a portion of the distal end of the first core wire 41 is fixed to the first cylindrical portion 10, while the distal end of the second core wire 42 does not necessarily have to be fixed to the first cylindrical portion 10.

[0050] As shown in Figure 3, the distal end 41a of the first core wire 41 does not have to be fixed to the first cylindrical portion 10. Although not shown, the distal end 41a of the first core wire 41 may be fixed to the first cylindrical portion 10.

[0051] As shown in Figures 5 and 6, at least a portion of the distal end of the first core wire 41 and at least a portion of the distal end of the second core wire 42 may be fixed to the first cylindrical portion 10.

[0052] As shown in Figure 5, the distal end 42a of the second core wire 42 does not have to be fixed to the first cylindrical portion 10. Although not shown, the distal end 42a of the second core wire 42 may be fixed to the first cylindrical portion 10.

[0053] As shown in Figure 5, the distal end 41a of the first core wire 41 and the distal end 42a of the second core wire 42 do not necessarily have to be fixed to the first cylindrical portion 10. Although not shown, the distal end 41a of the first core wire 41 and the distal end 42a of the second core wire 42 may be fixed to the first cylindrical portion 10.

[0054] In this specification, the term "core wire" refers to either one of the first core wire 41 and the second core wire 42, or both the first core wire 41 and the second core wire 42.

[0055] The core wire is preferably a linear member composed of a single wire or stranded wire.

[0056] The core wire can be made of metals such as stainless steel, carbon steel, and nickel-titanium alloy, or synthetic resins such as polyolefin resin, polyamide resin, polyester resin, aromatic polyetherketone resin, polyether polyamide resin, polyurethane resin, polyimide resin, fluororesin, and polyvinyl chloride resin. The core wire may also be made of metal and synthetic resin. For example, a wire made by braiding a wire made of metal and a wire made of synthetic resin, or a wire made of metal coated with synthetic resin can be used as the core wire. The material constituting the core wire is preferably metal, and more preferably stainless steel.

[0057] To facilitate deformation at the distal end, the core wire may have a portion where its rigidity decreases from the proximal end to the distal end. The rigidity of the entire core wire may decrease continuously from the proximal end to the distal end. It is also preferable that the outer diameter of the core wire, i.e., the thickness of the core wire, decreases from the proximal end to the distal end.

[0058] The cross-sectional shape of the core wire is not particularly limited, but it can be circular, elliptical, egg-shaped, polygonal, or a combination of these shapes. The cross-sectional shape of the core wire refers to the shape of the cross-section perpendicular to the longitudinal axis of the core wire.

[0059] As shown in Figures 2 to 6, it is preferable that the first lumen 101 and the second lumen 102 are aligned in the radial direction y of the first cylindrical portion 10. More specifically, it is preferable that the first lumen 101 and the second lumen 102 are aligned in the radial direction y of the first cylindrical portion 10 at the proximal end of the first cylindrical portion 10. At the distal end and the proximal end of the first cylindrical portion 10, the first lumen 101 and the second lumen 102 may be aligned in the radial direction y of the first cylindrical portion 10.

[0060] As shown in Figures 4 and 6, at the proximal end of the first cylindrical portion 10, the centroid 101 of the first lumen 101 and the second lumen 102 may be located at different positions. The centroid 102 of the second lumen 102 and the first lumen 101 may also be located at different positions.

[0061] As shown in Figures 4 and 6, at the proximal end of the first cylindrical portion 10, the first lumen 101 and the second lumen 102 may be positioned so as not to coincide with the centroid 10o of the outer shape of the first cylindrical portion 10.

[0062] As shown in Figures 2, 3, and 5, the catheter 100 may have a third tubular portion 30 extending in the longitudinal direction x of the first tubular portion 10. It is preferable that the third tubular portion 30 is located proximal to the first tubular portion 10. Only a part of the third tubular portion 30 may be located proximal to the first tubular portion 10, or the entire third tubular portion 30 may be located proximal to the first tubular portion 10.

[0063] The third cylindrical portion 30 preferably has a fourth lumen 30e in which the second cylindrical portion 20 is located. The third cylindrical portion 30 does not have to have a lumen that communicates with the first lumen 101 of the first cylindrical portion 10. The third cylindrical portion 30 does not have to have a lumen that communicates with the second lumen 102 of the first cylindrical portion 10. The third cylindrical portion 30 does not have to have a lumen that communicates with the third lumen 20e of the second cylindrical portion 20.

[0064] As shown in Figures 2, 3, and 5, the third cylindrical portion 30 may have a circumference smaller than the circumference of the first cylindrical portion 10. Although not shown, the circumference of the third cylindrical portion 30 may be the same as the circumference of the first cylindrical portion 10.

[0065] The third tubular portion 30 is preferably flexible because it is inserted into the body. This allows the third tubular portion 30 to deform to conform to the shape of the body cavity. Furthermore, it is preferable that the third tubular portion 30 is elastic in order to maintain its shape.

[0066] As materials that can constitute the third cylindrical portion 30, the same materials listed as those that can constitute the first cylindrical portion 10 can be used.

[0067] Furthermore, the outer surface of the third cylindrical portion 30 may be coated. The coating may be applied to only a part of the outer surface of the third cylindrical portion 30, or to the entire surface. As a coating that can be applied to the outer surface of the third cylindrical portion 30, the coatings exemplified as coatings that can be applied to the outer surface 10d of the first cylindrical portion 10 can be used.

[0068] As shown in Figures 2, 3, and 5, it is preferable that the first core wire 41 is positioned between the second cylindrical portion 20 and the third cylindrical portion 30. As shown in Figures 3 and 5, it is also preferable that the second core wire 42 is positioned between the second cylindrical portion 20 and the third cylindrical portion 30.

[0069] The first cylindrical portion 10 and the second cylindrical portion 20 may be manufactured as separate components and then joined together, or they may be composed of a single component. Alternatively, one cylindrical component intended to partition the first lumen 101 and the third lumen 20e, and another cylindrical component intended to partition the second lumen 102 may be prepared, and these two cylindrical components may be placed in parallel and their outer surfaces joined together to form the first cylindrical portion 10 having the first lumen 101 and the second lumen 102, and the second cylindrical portion 20 having the third lumen 20e.

[0070] The catheter 100 may have a tip 2 provided at the distal end of the first tubular portion 10. Preferably, the tip 2 has a lumen that serves as a passage for inserting a guidewire.

[0071] Examples of materials that make up the tip 2 include polyurethane resin, polyester resin, and polyamide resin. Preferably, the tip 2 is made of a material with lower rigidity than the material that makes up the first cylindrical portion 10.

[0072] The length of catheter 100 from the distal end to the proximal end can be, for example, 200 mm or more, 250 mm or more, 300 mm or more, etc. Alternatively, the length of catheter 100 from the distal end to the proximal end can be, for example, 2500 mm or less, 2450 mm or less, 2400 mm or less, etc. [Explanation of symbols]

[0073] 1: Hub 2: Tip 10: First cylindrical part 10d: Outer surface 10о: Centurion 101: First Lumen 101о: Centurion 102: Second Lumen 102о: Centurion 20: Second cylindrical section 20e: 3rd lumen 30: Third cylindrical part 30e: 4th lumen 41: First core wire 41a: Distal end 41r: First helical section 42: Second core wire 42a: Distal end 42r: Second helical section P: Pitch 100: Catheter

Claims

1. A first cylindrical portion having a longitudinal direction and comprising a first lumen and a second lumen extending in the longitudinal direction, A second cylindrical portion is located proximal to the first cylindrical portion and has a circumference smaller than the circumference of the first cylindrical portion, and comprises a third lumen that communicates with the first lumen but not with the second lumen, and the second cylindrical portion extends in the longitudinal direction, A first core wire having a first helical portion, wherein the first helical portion is located proximal to the first cylindrical portion, It has, The first helical portion is a catheter that is wound around the second cylindrical portion at a pitch of 80 mm or more.

2. The catheter according to claim 1, wherein the pitch of the first helical portion is 1500 mm or less.

3. The catheter according to claim 1, wherein the number of turns of the helix in the first helical portion is 1 or more and 20 or less.

4. The present invention relates to a second core wire having a second helical portion, wherein the second helical portion is located more proximal to the first cylindrical portion. The catheter according to claim 1, wherein the second helical portion is wound around the second cylindrical portion at a pitch of 80 mm or more.

5. The catheter according to claim 4, wherein the pitch of the second helical portion is 1500 mm or less.

6. The catheter according to claim 4, wherein the number of turns of the helix in the second helical portion is 1 or more and 20 or less.

7. The catheter according to claim 4, wherein the pitch of the first helical portion and the pitch of the second helical portion are different.

8. The catheter according to claim 4, wherein the distal end of the first core wire is positioned distal to the distal end of the second core wire.

9. The catheter according to claim 4, wherein at least a portion of the distal portion of the first core wire is fixed to the first tubular portion, and the distal portion of the second core wire is not fixed to the first tubular portion.

10. The catheter according to claim 9, wherein the distal end of the first core wire is not fixed to the first tubular portion.

11. The catheter according to claim 4, wherein at least a portion of the distal portion of the first core wire and at least a portion of the distal portion of the second core wire are fixed to the first tubular portion.

12. The catheter according to claim 11, wherein the distal end of the first core wire and the distal end of the second core wire are not fixed to the first tubular portion.

13. The catheter according to claim 1, wherein the first lumen and the second lumen are aligned radially in the first cylindrical portion.

14. A catheter according to any one of claims 1 to 13, comprising a third tubular portion located proximal to the first tubular portion, the third tubular portion comprising a fourth lumen in which the second tubular portion is located, and the third tubular portion extending in the longitudinal direction.

15. The catheter according to claim 14, wherein the first core wire is disposed between the second tubular portion and the third tubular portion.

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