WO2023233723A1

WO2023233723A1 - Catheter

Info

Publication number: WO2023233723A1
Application number: PCT/JP2023/005300
Authority: WO
Inventors: アロングコットジッタワット; リエングヴィワットティアンパワット
Original assignee: 朝日インテック株式会社
Priority date: 2022-05-30
Filing date: 2023-02-15
Publication date: 2023-12-07
Also published as: JP2023175171A

Abstract

This catheter comprises a cylindrical shaft, a first reinforcement body, and a second reinforcement body. The first reinforcement body is constructed with a plurality of wires that are spirally wound around the shaft. The second reinforcement body is constructed with one or more wires that are spirally wound around the shaft so as to overlap the first reinforcement body in the radial direction of the shaft. In a first overlap area, which is a part of multiple overlap areas between the first reinforcement body and the second reinforcement body, the first reinforcement body is situated on the inner side of the second reinforcement body. In a second overlap area, which is another part of the multiple overlap areas, the first reinforcement body is situated on the outer side of the second reinforcement body.

Description

catheter

The technology disclosed herein relates to a catheter.

A catheter is a long medical device that is inserted into a living body lumen such as a blood vessel and used to diagnose or treat the inside of the living body lumen. The catheter includes a cylindrical shaft and a reinforcing body that reinforces the shaft. As the reinforcing body, for example, a coil body spirally wound around the shaft is used (see, for example, Patent Document 1).

JP 2020-6189 Publication

When the catheter is used, the shaft may stretch. For example, when a catheter moves through a curved blood vessel, the lumen of the shaft narrows due to external pressure, and the narrowed lumen is filled with an object (e.g., an embolic coil for plugging an aneurysm or a highly viscous embolus). As the object (substance) passes, the resistance between the object and the surface of the lumen may cause the shaft to elongate. Further, when the catheter is inserted into a bent part or an occluded part in a blood vessel and then pulled back toward the proximal end, the shaft may be stretched.

If the shaft is stretched, there is a risk of the shaft breaking. Stretching the shaft also narrows the lumen of the shaft, which can cause concomitant devices passing through the lumen (e.g., guide wires, microcatheters, etc.) to become stuck, and fluids in the lumen (e.g., to occlude an aneurysm). There is a risk that the smooth flow of embolic material, expansion medium for expanding a balloon catheter, etc.) may be obstructed. In addition, when the shaft is stretched, the position of the marker provided at the tip of the shaft and the spacing between multiple markers change, so it is possible to administer an object based on the position of the marker (for example, administering an embolic substance to an aneurysm). There is a risk that the accuracy of positioning (administration) may decrease. Therefore, in a catheter, it is preferable to improve the elongation resistance of the shaft.

In conventional catheters, a simple coil body is used as a reinforcement body to reinforce the shaft, so when the shaft tries to stretch, the reinforcement body stretches or misaligns, and the reinforcement body There is a problem in that it is not possible to sufficiently improve the elongation resistance of.

This specification discloses a technique that can solve the above-mentioned problems.

(1) The catheter disclosed herein includes a cylindrical shaft, a first reinforcing body, and a second reinforcing body. The first reinforcing body is composed of a plurality of wires wound helically around the shaft. The second reinforcing body is composed of at least one strand of wire spirally wound around the shaft so as to overlap the first reinforcing body in the radial direction of the shaft. At a first overlapping location that is part of a plurality of overlapping locations between the first reinforcing body and the second reinforcing body, the first reinforcing body is located radially inward of the shaft from the second reinforcing body. do. At a second overlapping location, which is another part of the plurality of overlapping locations, the first reinforcing body is located radially outward of the shaft from the second reinforcing body.

In this catheter, there are a first overlap location where the first reinforcement body is located inside the second reinforcement body and a second overlap location where the first reinforcement body is located outside the second reinforcement body. Therefore, the first reinforcing body and the second reinforcing body restrain each other. Therefore, according to this catheter, when the shaft tries to stretch, the first reinforcing body and the second reinforcing body restrain each other, thereby preventing stretching or positional shift, and the first reinforcing body The elongation resistance of the shaft can be sufficiently improved by the body and the second reinforcing body.

(2) In the above catheter, at least some of the overlapping locations may be configured such that the first overlapping locations and the second overlapping locations are regularly arranged along the longitudinal direction of the shaft. If this configuration is adopted, the first reinforcing body and the second reinforcing body firmly restrain each other, so that the elongation resistance of the shaft can be further effectively improved.

(3) In the above catheter, at least some of the overlapping locations may be configured such that the first overlapping locations and the second overlapping locations are alternately arranged along the longitudinal direction of the shaft. If this configuration is adopted, the first reinforcing body and the second reinforcing body restrain each other more firmly, so that the elongation resistance of the shaft can be extremely effectively improved.

(4) In the above catheter, the number of strands constituting the second reinforcing body may be smaller than the number of strands constituting the first reinforcing body. By employing this configuration, it is possible to improve the elongation resistance of the shaft while suppressing a decrease in the flexibility of the shaft due to the presence of the second reinforcing body.

(5) In the above catheter, the winding direction of the second reinforcing body and the winding direction of the first reinforcing body may be opposite to each other. In this configuration, compared to a configuration in which the winding direction of the second reinforcement body and the winding direction of the first reinforcement body are the same, the number of overlapping parts of the first reinforcement body and the second reinforcement body is increased. I can do it. Therefore, if this configuration is adopted, the first reinforcing body and the second reinforcing body restrain each other more firmly, thereby effectively improving the elongation resistance of the shaft.

Note that the technology disclosed in this specification can be realized in various forms, for example, in the form of a catheter, a method for manufacturing a catheter, etc.

An explanatory diagram schematically showing the side configuration of the catheter 100 of this embodiment An explanatory diagram schematically showing a cross-sectional configuration of a portion of the catheter 100 (X1 section in FIG. 1) An explanatory diagram schematically showing a side configuration of a portion of the catheter 100 (X1 portion in FIG. 1) An explanatory diagram schematically showing the configuration of the first reinforcing body 21 and the second reinforcing body 22 in the catheter 100 of the present embodiment An explanatory diagram schematically showing the configuration of the first reinforcing body 21 and the second reinforcing body 22 in the catheter 100X1 of the first comparative example An explanatory diagram schematically showing the configuration of the first reinforcing body 21 and the second reinforcing body 22 in the catheter 100X2 of the second comparative example

A. Embodiment:
A-1. Configuration of catheter 100:
FIG. 1 is an explanatory view schematically showing a side configuration of a catheter 100 of the present embodiment, and FIG. 2 is an explanatory view schematically showing a cross-sectional configuration of a portion of the catheter 100 (X1 portion in FIG. 1). , FIG. 3 is an explanatory diagram schematically showing a side configuration of a portion of the catheter 100 (portion X1 in FIG. 1).

Each figure shows XYZ axes that are orthogonal to each other. In the catheter 100, the Z-axis positive direction side is the distal end side (distal side) inserted into the body, and the Z-axis negative direction side is the base end side (proximal side) operated by a technician such as a doctor. . In each figure, a part of the structure of the catheter 100 is shown enlarged or omitted as appropriate. Further, although each figure shows a state in which the central axis Ax of the catheter 100 is approximately straight parallel to the Z-axis direction, the catheter 100 has flexibility to the extent that it can be curved. . In this specification, regarding the catheter 100 and each component thereof, the distal end is referred to as the "distal end", the distal end and the vicinity thereof is referred to as the "distal end", the proximal end is referred to as the "proximal end", The proximal end and its vicinity are referred to as the "proximal end".

The catheter 100 is inserted into a living body lumen such as a vascular system, a lymphatic system, a biliary system, a urinary tract system, a respiratory system, a digestive system, a secretory gland, and a reproductive organ, and is used to diagnose or treat the inside of a living body lumen. This is a long medical device used. The catheter 100 includes a shaft 10, a distal reinforcement 20, a proximal reinforcement 30, and a connector 90.

The shaft 10 is a cylindrical long member that extends along the central axis Ax. The shaft 10 is formed with an inner cavity 10M (FIG. 2) that extends along the central axis Ax from the distal end to the proximal end of the shaft 10. The cross-sectional shape of the inner cavity 10M can take any arbitrary shape, but is approximately circular, for example. The lumen 10M of the shaft 10 is for passing a concomitant device (e.g., a guide wire, a microcatheter, etc.) or a fluid (e.g., an embolic material for occluding an aneurysm, an expansion medium for dilating a balloon catheter, etc.). used for. The outer diameter, inner diameter, and overall length of the shaft 10 can be set arbitrarily. The outer diameter of the shaft 10 is, for example, about 0.2 mm to 2.0 mm, and the total length of the shaft 10 is, for example, about 1200 to 1800 mm.

As shown in FIG. 1, a first marker 18 and a second marker 19 are provided at the tip of the shaft 10. The first marker 18 is placed near the tip of the shaft 10, and the second marker 19 is placed a predetermined distance (for example, about 30 mm) from the first marker 18 on the proximal side. The first marker 18 and the second marker 19 are made of a radiopaque material. A technician such as a doctor can grasp the position of the tip of the shaft 10 by visually recognizing the first marker 18 under radiation. Further, even if the first marker 18 cannot be visually recognized under radiation, the operator can grasp the position of the tip of the shaft 10 based on the position where the second marker 19 is visually recognized and the predetermined distance.

As shown in FIG. 2, in this embodiment, the shaft 10 is composed of an inner layer 11 and an outer layer 12. The inner layer 11 is a cylindrical member that defines the inner cavity 10M, and the outer layer 12 is a cylindrical member that covers the outer periphery of the inner layer 11. Note that in FIG. 3, illustration of the outer layer 12 is omitted for convenience of explanation.

The shaft 10 is preferably formed of a material that is antithrombotic, flexible, and biocompatible. Examples of materials for forming the shaft 10 include resin materials such as polyamide resin, polyolefin resin, polyester resin, polyurethane resin, silicone resin, and fluororesin. For example, the inner layer 11 is made of polytetrafluoroethylene (PTFE), and the outer layer 12 is made of nylon-based elastomer resin. The configuration including the material forming the shaft 10 may be uniform over the entire length, or may be different from section to section along the longitudinal direction.

As shown in FIG. 1, the connector 90 constitutes the proximal end of the catheter 100 and is a member held by the operator. The connector 90 includes, for example, a substantially cylindrical main body 91 and a plurality of blades 92 formed on the outer peripheral surface of the main body 91. A proximal end portion of the shaft 10 is inserted and joined to the distal end portion of the main body portion 91 . An opening (not shown) communicating with the inner cavity 10M of the shaft 10 is formed at the base end of the main body portion 91 . The connector 90 is made of a resin material such as polyamide, polypropylene, polycarbonate, polyacetal, polyether sulfone, or the like.

The distal end reinforcement body 20 is a member for reinforcing the shaft 10 and is embedded in the distal end portion of the shaft 10. As shown in FIG. 2, the distal end reinforcement body 20 is wrapped around the outer peripheral surface of the inner layer 11 of the shaft 10 and covered by the outer layer 12 of the shaft 10. The configuration of the distal end reinforcement body 20 will be described in detail later.

The proximal reinforcing body 30 is a member for reinforcing the shaft 10, and is buried in a portion of the shaft 10 closer to the proximal end than the portion where the distal reinforcing body 20 is buried. The proximal reinforcing body 30 may have any configuration, but for example, it may be a mesh-shaped cylindrical body (a so-called braid) made of wires in a mesh weave, or it may be a mesh-shaped cylindrical body made of wires wound in a spiral shape. It may be a coil body. The proximal reinforcing body 30 is made of, for example, a metal material or a resin material. In FIG. 1, for convenience of explanation, the distal end reinforcing body 20 and the proximal reinforcing body 30 embedded in the shaft 10 are shown by solid lines.

A-2. Detailed configuration of the tip side reinforcement body 20:
Next, the detailed configuration of the distal end reinforcement body 20 will be explained. As shown in FIGS. 2 and 3, the distal end reinforcing body 20 includes a first reinforcing body 21 and a second reinforcing body 22. As shown in FIGS.

The first reinforcing body 21 is a coil body composed of a plurality of wires 21a spirally wound around the shaft 10. In this embodiment, the first reinforcing body 21 is composed of eight strands 21a. The eight wires 21a constituting the first reinforcing body 21 are arranged so as to be in contact with each other along the longitudinal direction of the shaft 10 (direction parallel to the central axis Ax). The first reinforcing body 21 is configured by loosely winding an assembly of these eight wires 21a in a spiral shape. The first reinforcing body 21 is Z-wound around the shaft 10.

The second reinforcing body 22 is a coil body composed of at least one strand 22a spirally wound around the shaft 10 so as to overlap with the first reinforcing body 21 in the radial direction of the shaft 10. In this embodiment, the second reinforcing body 22 is composed of one strand 22a. That is, the number of strands 22a constituting the second reinforcing body 22 is smaller than the number of strands 21a constituting the first reinforcing body 21. The second reinforcing body 22 is configured by loosely winding this single wire 22a in a spiral shape. The second reinforcing body 22 is wound around the shaft 10 in an S-wound manner. That is, the winding direction of the second reinforcement body 22 and the winding direction of the first reinforcement body 21 are opposite.

The first reinforcing body 21 and the second reinforcing body 22 are formed of, for example, a metal material (stainless steel alloy such as SUS304, NiTi alloy, tungsten, etc.) or a resin material. Note that since the number of strands 22a constituting the second reinforcing body 22 is smaller than the number of strands 21a constituting the first reinforcing body 21, the load is concentrated on the strands 22a constituting the second reinforcing body 22. It is preferable that the tensile strength of the material forming the second reinforcing body 22 is higher than the tensile strength of the material forming the first reinforcing body 21. The first reinforcing body 21 is made of, for example, a NiTi alloy, and the second reinforcing body 22 is made of, for example, tungsten.

Here, as shown in FIG. 3, since both the first reinforcing body 21 and the second reinforcing body 22 are spiral coil bodies, they overlap in the radial direction of the shaft 10 at a plurality of overlapping points OP. In the first overlapping point OP1, which is a part of the plurality of overlapping points OP, the first reinforcing body 21 is located on the radially inner side of the shaft 10 (hereinafter simply referred to as "inner side") than the second reinforcing body 22. ing. On the other hand, in the second overlapping point OP2, which is another part of the plurality of overlapping points OP, the first reinforcing body 21 is located on the radially outer side of the shaft 10 (hereinafter simply referred to as "outer side") than the second reinforcing body 22. ). As described above, in the catheter 100 of the present embodiment, the first reinforcing body 21 overlaps with the second reinforcing body 22 such that the first reinforcing body 21 overlaps with the second reinforcing body OP1, and the first reinforcing body 21 overlaps with the second reinforcing body 22 so that the first reinforcing body 21 A second overlapping location OP2 where the two overlap so as to be located outside the body 22 coexists.

More specifically, as shown in FIG. 3, for at least some of the overlapping points OP, a first overlapping point OP1 and a second overlapping point are arranged along the longitudinal direction of the shaft 10 (direction parallel to the central axis Ax). OP2 are arranged alternately. In other words, the first overlapping points OP1 and the second overlapping points OP2 are regularly arranged along the longitudinal direction of the shaft 10. In addition, in this embodiment, for all the overlapping points OP, first overlapping points OP1 and second overlapping points OP2 are arranged alternately along the longitudinal direction of the shaft 10.

Note that the first reinforcing body 21 and the second reinforcing body 22 having such a configuration are formed by, for example, using a braiding machine to form bobbins for the eight strands 21a for the first reinforcing body 21 and the second reinforcing body 21. It can be produced by knitting each strand while relatively moving the bobbin for one strand 22a for the body 22.

A-3. Effects of this embodiment:
As explained above, the catheter 100 of this embodiment includes the cylindrical shaft 10, the first reinforcing body 21, and the second reinforcing body 22. The first reinforcing body 21 is composed of a plurality of wires 21a spirally wound around the shaft 10. The second reinforcing body 22 is composed of at least one strand 22a spirally wound around the shaft 10 so as to overlap with the first reinforcing body 21 in the radial direction of the shaft 10. In the first overlapping point OP1, which is a part of the plurality of overlapping points OP between the first reinforcing body 21 and the second reinforcing body 22, the first reinforcing body 21 is located on the radially inner side of the shaft 10 than the second reinforcing body 22. At the second overlapping point OP2, which is another part of the plurality of overlapping points OP, the first reinforcing body 21 is located radially outward of the shaft 10 from the second reinforcing body 22.

Since the catheter 100 of this embodiment has such a configuration, the elongation resistance of the shaft 10 can be improved as described below. FIG. 4 is an explanatory diagram schematically showing the configuration of the first reinforcing body 21 and the second reinforcing body 22 in the catheter 100 of this embodiment. Further, FIG. 5 is an explanatory diagram schematically showing the configuration of the first reinforcing body 21 and the second reinforcing body 22 in the catheter 100X1 of the first comparative example, and FIG. FIG. 2 is an explanatory diagram schematically showing the configurations of a first reinforcing body 21 and a second reinforcing body 22. FIG.

In the catheter 100X1 of the first comparative example shown in FIG. This is the second overlapping point OP2. Therefore, the first reinforcing body 21 is not restrained by the second reinforcing body 22. Further, although the second reinforcing body 22 is restrained by the tension of the first reinforcing body 21, the restraining force is small. Therefore, when the shaft 10 tries to stretch, the first reinforcing body 21 and the second reinforcing body 22 stretch or become misaligned, and the first reinforcing body 21 and the second reinforcing body 22 cause the shaft 10 to It is not possible to sufficiently improve elongation resistance.

In addition, in the catheter 100X2 of the second comparative example shown in FIG. The first overlapping point OP1 is located at . Therefore, the second reinforcement body 22 is not restrained by the first reinforcement body 21. Further, although the first reinforcing body 21 is restrained by the tension of the second reinforcing body 22, the restraining force is small. Therefore, when the shaft 10 tries to stretch, the first reinforcing body 21 and the second reinforcing body 22 stretch or become misaligned, and the first reinforcing body 21 and the second reinforcing body 22 cause the shaft 10 to It is not possible to sufficiently improve elongation resistance.

On the other hand, as shown in FIG. 4, in the catheter 100 of the present embodiment, the first reinforcing body 21 overlaps the first overlapping portion OP1 located inside the second reinforcing body 22, and the first reinforcing body 21 overlaps the second reinforcing body 22. A second overlapping portion OP2 located outside the reinforcing body 22 is also present. Therefore, the first reinforcing body 21 and the second reinforcing body 22 restrain each other. Therefore, when the shaft 10 tries to stretch, the first reinforcing body 21 and the second reinforcing body 22 are restrained from stretching or misaligning due to mutual restraint, and the first reinforcing body 21 and the second reinforcing body 22 are restrained from stretching or misaligning. The elongation resistance of the shaft 10 can be sufficiently improved by the second reinforcing body 22.

As described above, according to the catheter 100 of the present embodiment, the elongation resistance of the shaft 10 can be sufficiently improved by the first reinforcing body 21 and the second reinforcing body 22, so that breakage of the shaft 10 can be suppressed. I can do it. Further, it is possible to prevent the combined device that passes through the inner cavity 10M of the shaft 10 from getting stuck or the smooth flow of fluid in the inner cavity 10M being inhibited due to the extension of the shaft 10. Further, it is possible to suppress changes in the positions of the markers (the first marker 18 and the second marker 19) provided at the distal end of the shaft 10 and the intervals between the plurality of markers due to the stretching of the shaft 10. , it is possible to suppress a decrease in the accuracy of positioning the administration of the object based on the position of the marker.

In addition, in the shaft 10 of the present embodiment, at least some of the overlapping points OP are arranged such that the first reinforcing body 21 and the first overlapping point OP1 are located inside the second reinforcing body 22 along the longitudinal direction of the shaft 10. , and a second overlapping portion OP2 where the first reinforcing body 21 is located outside the second reinforcing body 22 are regularly arranged. Therefore, according to the catheter 100 of the present embodiment, the first reinforcing body 21 and the second reinforcing body 22 firmly restrain each other, so that the elongation resistance of the shaft 10 can be further effectively improved.

In addition, in the shaft 10 of the present embodiment, at least some of the overlapping points OP are arranged such that the first reinforcing body 21 and the first overlapping point OP1 are located inside the second reinforcing body 22 along the longitudinal direction of the shaft 10. , and a second overlapping location OP2 where the first reinforcing body 21 is located outside the second reinforcing body 22 are alternately arranged. Therefore, according to the catheter 100 of the present embodiment, the first reinforcing body 21 and the second reinforcing body 22 restrain each other more firmly, so that the elongation resistance of the shaft 10 can be extremely effectively improved.

In addition, in the shaft 10 of the present embodiment, the number of strands 22a forming the second reinforcing body 22 is smaller than the number of strands 21a forming the first reinforcing body 21. Therefore, according to the catheter 100 of the present embodiment, the elongation resistance of the shaft 10 can be improved while suppressing a decrease in the flexibility of the shaft 10 due to the presence of the second reinforcing body 22.

Furthermore, in the shaft 10 of the present embodiment, the number of strands 22a constituting the second reinforcing body 22 is one. Therefore, according to the catheter 100 of this embodiment, the elongation resistance of the shaft 10 can be improved while effectively suppressing a decrease in the flexibility of the shaft 10 due to the presence of the second reinforcing body 22.

Furthermore, in the shaft 10 of this embodiment, the winding direction of the second reinforcing body 22 and the winding direction of the first reinforcing body 21 are opposite to each other. Therefore, in the catheter 100 of this embodiment, compared to a configuration in which the winding direction of the second reinforcing body 22 and the winding direction of the first reinforcing body 21 are the same, the first reinforcing body 21 and the second reinforcing body 21 are The number of overlapping points OP can be increased. Therefore, according to the catheter 100 of the present embodiment, the first reinforcing body 21 and the second reinforcing body 22 restrain each other more firmly, so that the elongation resistance of the shaft 10 can be effectively improved.

B. Variant:
The technology disclosed in this specification is not limited to the above-described embodiments, and can be modified into various forms without departing from the gist thereof. For example, the following modifications are also possible.

The configuration of the catheter 100 in the above embodiment is merely an example, and can be modified in various ways. For example, in the above embodiment, along the longitudinal direction of the shaft 10, the first reinforcing body 21 overlaps with the second reinforcing body 22, and the first reinforcing body 21 overlaps with the second reinforcing body 22. Although the second overlapping points OP2 located further outside are arranged alternately, the arrangement of the first overlapping points OP1 and the second overlapping points OP2 is not limited to this. For example, regarding at least some of the overlapping points OP, along the longitudinal direction of the shaft 10, there are M first overlapping points OP1 (M is an integer of 1 or more), and N first overlapping points OP1 (N is an integer of 1 or more). The configuration may be such that the two overlapping locations OP2 are alternately arranged. Note that such a configuration can be said to be a configuration in which the first overlapping locations OP1 and the second overlapping locations OP2 are regularly arranged. Alternatively, the first overlapping portion OP1 and the second overlapping portion OP2 may be irregularly arranged along the longitudinal direction of the shaft 10.

In the above embodiment, the first reinforcing body 21 is composed of eight strands 21a, but the number of strands 21a constituting the first reinforcing body 21 can be arbitrarily set as long as it is a plurality of strands. be able to. Further, in the above embodiment, the second reinforcing body 22 is composed of one strand 22a, but the number of strands 22a constituting the second reinforcing body 22 can be set arbitrarily. Further, in the above embodiment, the number of strands 22a constituting the second reinforcing body 22 is smaller than the number of strands 21a constituting the first reinforcing body 21, but the number of strands 22a constituting the second reinforcing body 22 is The number of strands may be greater than or equal to the number of strands 21a constituting the first reinforcing body 21.

In the above embodiment, the first reinforcing body 21 is Z-wound around the shaft 10 and the second reinforcing body 22 is S-wound around the shaft 10, but conversely, the first reinforcing body 21 is wound around the shaft 10 On the other hand, the second reinforcing body 22 may be wound in a Z manner around the shaft 10. Further, in the above embodiment, the winding direction of the second reinforcement body 22 and the winding direction of the first reinforcement body 21 are opposite, but the winding direction of the second reinforcement body 22 and the winding direction of the first reinforcement body 21 are opposite to each other. may be in the same direction.

In the above embodiment, the distal reinforcement body 20 is embedded in the distal end of the shaft 10, but the distal reinforcement body 20 may be embedded in the proximal end of the shaft 10, or may be embedded in the distal end of the shaft 10. The shaft 10 may be buried in an intermediate portion excluding the base end portion and the base end portion, or may be buried over the entire length of the shaft 10.

In the above embodiment, the shaft 10 is provided with two markers (the first marker 18 and the second marker 19), but the shaft 10 may be provided with only one marker, or the shaft 10 may be provided with two markers (the first marker 18 and the second marker 19). may not be provided.

10: Shaft 10M: Inner cavity 11: Inner layer 12: Outer layer 18: First marker 19: Second marker 20: Tip side reinforcement 21: First reinforcement 21a: Element wire 22: Second reinforcement 22a: Element wire 30 : Proximal reinforcement 90: Connector 91: Main body 92: Wing part 100: Catheter OP1: First overlapping location OP2: Second overlapping location OP: Overlapping location

Claims

A catheter,
a cylindrical shaft,
a first reinforcing body composed of a plurality of wires spirally wound around the shaft;
a second reinforcing body made of at least one strand of wire spirally wound around the shaft so as to overlap with the first reinforcing body in the radial direction of the shaft;
Equipped with
At a first overlapping location that is part of a plurality of overlapping locations between the first reinforcing body and the second reinforcing body, the first reinforcing body is located radially inward of the shaft from the second reinforcing body. In a second overlapping location that is another part of the plurality of overlapping locations, the first reinforcing body is located radially outward of the shaft from the second reinforcing body.
catheter.
The catheter according to claim 1,
Regarding at least some of the overlapping locations, the first overlapping locations and the second overlapping locations are regularly arranged along the longitudinal direction of the shaft;
catheter.
The catheter according to claim 2,
Regarding at least some of the overlapping locations, the first overlapping locations and the second overlapping locations are alternately arranged along the longitudinal direction of the shaft;
catheter.
The catheter according to any one of claims 1 to 3,
The number of strands constituting the second reinforcing body is smaller than the number of strands constituting the first reinforcing body.
catheter.
The catheter according to any one of claims 1 to 4,
The winding direction of the second reinforcing body and the winding direction of the first reinforcing body are opposite;
catheter.