JP2023095380A - catheter - Google Patents

Abstract

To provide a catheter capable of realizing better tensile strength of a catheter.SOLUTION: A catheter 100 has: a long tubular body 10 having a lumen 31; a marker 70; a metal reinforcement layer 41 which is composed of a braided metal wire material and is embedded in the tubular body 10 in an arrangement coaxial to the tubular body 10; and a resin reinforcement layer 46 which is composed of braided resin wire material and is embedded in the tubular body 10 in the arrangement coaxial to the tubular body 10. The metal reinforcement layer 41 and the resin reinforcement layer 46 are arranged in the same layer, a tip end of the metal reinforcement layer 41 and a base end of the resin reinforcement layer 46 are terminated at a position of the marker 70, and a tip end part 41a of the metal reinforcement layer 41 and a base end part 46b of the resin reinforcement layer 46 are pressed by the marker 70 from the surroundings.SELECTED DRAWING: Figure 2

Description

The present invention relates to catheters.

In recent years, catheters that can be inserted into body cavities such as blood vessels have been developed (for example, Patent Document 1).
Catheters are generally inserted into body cavities by an over-the-wire technique using a guide wire. In this technique, the tip of a guide wire inserted through a catheter is protruded from the tip of the catheter, and after the tip of the guide wire reaches a desired branch channel, the catheter is pushed along the guide wire to is inserted into the desired branch.
The document describes a configuration in which the reinforcing layer terminates at the position of the marker.

JP-A-2007-82802

According to studies by the inventors of the present application, the structure of the catheter of Patent Document 1 has room for improvement in terms of the tensile strength of the catheter.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a catheter having a structure capable of realizing a superior tensile strength of the catheter.

The present invention provides an elongate tubular body having a lumen;
a marker embedded in the distal end of the tubular body in a coaxial arrangement with the tubular body;
a metal reinforcement layer made of braided metal wires and embedded in the tubular body in a coaxial arrangement with the tubular body;
a resin reinforcing layer composed of a braided resin wire and embedded in the tubular body in a coaxial arrangement with the tubular body;
has
The metal reinforcing layer and the resin reinforcing layer are arranged in the same layer,
the distal end of the metal reinforcing layer and the proximal end of the resin reinforcing layer terminate at the position of the marker;
The present invention provides a catheter in which the distal end portion of the metal reinforcing layer and the proximal end portion of the resin reinforcing layer are pressed from the periphery by the marker.

ADVANTAGE OF THE INVENTION According to this invention, the tensile strength of a catheter can be improved.

1 is an overall view of a catheter according to a first embodiment; FIG. Fig. 2 is a vertical cross-sectional view showing the distal end portion of the catheter and its peripheral structure according to the first embodiment; Fig. 3 is a vertical cross-sectional view of the distal end portion of the catheter according to the first embodiment; FIG. 4 is a side view selectively showing a metal reinforcing layer, a resin reinforcing layer, and a marker in the first embodiment; FIGS. 5(a) and 5(b) are diagrams for explaining an example of a series of steps for fixing a metal reinforcing layer and a resin reinforcing layer to a tubular body using markers in the first embodiment. FIG. 10 is a vertical cross-sectional view of the distal end portion of the catheter according to the second embodiment; FIG. 7(a) is a side view selectively showing a metal reinforcing layer, a resin reinforcing layer, and markers in a catheter according to a third embodiment, and FIG. 7(b) is a portion of part A shown in FIG. 7(a). It is an enlarged view.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in all the drawings, the same reference numerals are given to the same constituent elements, and the description thereof will be omitted as appropriate.
Various components of the catheter 100 according to the present embodiment do not need to exist independently, and a plurality of components are formed as one member, and one component is formed by a plurality of members. one component being part of another component, part of one component overlapping part of another component, etc.

Terms used in describing embodiments of the present invention are defined as follows unless otherwise specified.
The distal end is the end (distal end) of the catheter 100 on the insertion distal end side in each part of the catheter 100, and the proximal end is the end (distal end) on the proximal side of the catheter 100 in each part of the catheter 100. proximal end).
Moreover, the axis means the central axis along the longitudinal direction of the tubular body 10 .
A longitudinal section of the catheter 100 refers to a section obtained by cutting the catheter 100 along its axis.

[First Embodiment]
First, a first embodiment will be described with reference to FIGS. 1 to 5(b).
As shown in any of FIGS. 1 to 3, the catheter 100 according to this embodiment includes an elongated tubular body 10 having a lumen 31 and a distal end portion 10a of the tubular body 10 arranged coaxially with the tubular body 10. The marker 70 is embedded, the metal reinforcing layer 41 is composed of a braided metal wire rod, and is embedded in the tubular body 10 coaxially with the tubular body 10, and is composed of a braided resin wire rod. and a resin reinforcement layer 46 embedded in the tubular body 10 in a coaxial arrangement with the tubular body 10 .
The metal reinforcing layer 41 and the resin reinforcing layer 46 are arranged in the same layer, and the distal end 411 of the metal reinforcing layer 41 and the base end 462 of the resin reinforcing layer 46 terminate at the position of the marker 70, and the metal reinforcing layer 41 and the resin reinforcing layer 46 are arranged in the same layer. The distal end portion 41 a of the layer 41 and the proximal end portion 46 b of the resin reinforcing layer 46 are pressed from the surroundings by a marker 70 .
Here, the fact that the metal reinforcing layer 41 and the resin reinforcing layer 46 are arranged in the same layer means that the positions of the metal reinforcing layer 41 and the resin reinforcing layer 46 overlap each other in the radial direction. ing. Note that the metal reinforcing layer 41 and the resin reinforcing layer 46 do not necessarily have to completely overlap each other in the radial direction, and may at least partially overlap each other.

Catheter 100 is, for example, a flow direct catheter that advances along with blood flow.
For example, the catheter 100 is inserted into the body from the artery at the root of the femur of the subject, and the tip of the tubular body 10 is inserted into the perforator branched from the internal carotid artery via the heart and the internal carotid artery. used to perform Therefore, the tubular body 10 is manufactured with a length corresponding to such procedures. However, the present invention is not limited to this example, and the catheter 100 may have a length suitable for insertion into other sites.

According to this embodiment, the metal reinforcing layer 41 and the resin reinforcing layer 46 are embedded in the tubular body 10, and the distal end portion 41a of the metal reinforcing layer 41 and the proximal end portion 46b of the resin reinforcing layer 46 are It is pressed from the surroundings by the marker 70 .
As a result, the tensile strength of the distal end portion 10a (especially the portion closer to the distal end than the marker 70) can be improved. Therefore, for example, after the embolic agent (adhesive) is injected into the body cavity to harden the embolic agent together with the catheter 100, when the catheter 100 is removed, even the distal end portion 10a can be easily removed. .
In addition, since the metal reinforcing layer 41 and the resin reinforcing layer 46 are arranged in the same layer, the tubular main body 41 and the resin reinforcing layer 46 are arranged in different layers. The outer diameter of 10 can be made smaller. Therefore, the peripheral reachability of the catheter 100 can be improved, so that the distal end portion 10a can reach the perforator veins and the like satisfactorily.
Furthermore, since the resin reinforcing layer 46 is arranged on the distal end side of the metal reinforcing layer 41, the flexibility of the distal end portion 10a can be sufficiently ensured. Therefore, the distal end portion 10a can be advanced into the body cavity along the guide wire while the tubular main body 10 well follows the bending shape of the guide wire (not shown).
On the other hand, since the metal reinforcing layer 41 is arranged on the proximal side of the resin reinforcing layer 46, the rigidity of the tubular body 10 can be sufficiently secured on the proximal side of the marker 70. FIG. Therefore, moderate pushability of the tubular body 10 can be realized.

As shown in FIGS. 1 and 2, tubular body 10 is an elongate hollow tubular member.
As shown in FIGS. 2 and 3, the tubular body 10 has, for example, a two-layer structure including an inner layer 32 and an outer layer 33 provided around the inner layer 32. From the axial center side of the tubular body 10, An inner layer 32 and an outer layer 33 are laminated in this order.
The inner layer 32 is the innermost layer of the tubular main body 10, and is, for example, shaped like a circular tube having a constant wall thickness regardless of the position in the axial direction. The inner layer 32 is open at both distal and proximal ends of the tubular body 10 . In this embodiment, lumen 31 is defined by the inner peripheral surface of inner layer 32 .
The inner layer 32 is made of, for example, fluorine-based thermoplastic polymer resin. The fluorine-based thermoplastic polymer material can be, but is not limited to, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), perfluoroalkoxy fluororesin (PFA), and the like.
Outer layer 33 is the outermost layer of tubular body 10 . For example, most (majority) of the thickness of the tubular body 10 is occupied by the thickness of the outer layer 33 .
The lumen 31 is formed continuously from the distal end to the proximal end of the tubular body 10 and is open at the distal end and the proximal end of the tubular body 10 respectively.

In the case of this embodiment, the tubular body 10 includes a distal tip 80 (see FIGS. 1 and 2), and the distal end of the tubular body 10 is formed by the distal end of the distal tip 80 . The distal tip 80 has a distal lumen 61 that is open at the distal end, and the distal lumen 61 constitutes a portion of the lumen 31 .
In the case of this embodiment, the distal tip 80 is a portion of the tubular body 10 on the distal side of the position of the marker 70 .
The distal tip 80 has a layered structure similar to that of other portions of the tubular body 10 . That is, the tip 80 has a two-layer structure of the inner layer 32 and the outer layer 33 .
In the case of this embodiment, the outer diameter of the distal tip 80 is constant regardless of the position of the distal tip 80 in the axial direction.
Note that the corners on the outer peripheral side of the distal end of the distal tip 80 may be R-chamfered. , the outer diameter of the distal tip 80 is constant regardless of the position of the distal tip 80 in the axial direction.

As shown in FIG. 1, in the case of the present embodiment, the tubular body 10 includes, as an example, a distal small diameter region 21, an enlarged diameter region 23 connected to the proximal side of the distal small diameter region 21, an enlarged diameter region and a large diameter region 22 adjacent to the proximal end of 23 and having a larger diameter than the distal small diameter region 21 .
In the distal side small diameter region 21, for example, the inner diameter and the outer diameter are constant regardless of the position in the axial direction of the tubular body 10. As shown in FIG.
In the enlarged diameter region 23, for example, the inner diameter of the lumen 31 and the outer diameter of the tubular main body 10 are gradually enlarged toward the base end side.
In the large-diameter region 22, for example, the inner and outer diameters are constant regardless of the position in the axial direction of the tubular body 10. As shown in FIG.
However, the tubular body 10 is not limited to such a configuration, and for example, the inner diameter and outer diameter of the tubular body 10 may be substantially constant regardless of the position in the axial direction.

In addition, a hydrophilic coating may be formed on the outer surface layer of the distal end portion of the tubular body 10 and the outer surface layer of the distal tip 80 as necessary.

The length of the tip 80 in the axial direction (L1 shown in FIG. 2) is preferably 2.5 mm or more and 7 mm or less, more preferably 3 mm or more, and 4 mm or more and 6 mm or less. is more preferable, and typically can be about 6 mm. The length of the distal tip 80 is preferably set to a length equivalent to the inner diameter of a relatively large-diameter blood vessel (internal carotid artery, etc.) before branching into a small-diameter blood vessel such as a perforator.
The total length of the tubular body 10 is preferably 130 cm or more and 200 cm or less, and can typically be about 165 cm.

In the case of this embodiment, each of the metal reinforcing layer 41 and the resin reinforcing layer 46 is arranged around the inner layer 32 so as to surround the inner layer 32 .
More specifically, for example, the metal reinforcing layer 41 is formed in the tubular body 10 continuously from a position on the distal side of the proximal end of the marker 70 and on the proximal side of the distal end of the marker 70 to the proximal end. Although it is positioned, it is not positioned distally of the position of the marker 70 .
On the other hand, in the tubular body 10, the resin reinforcing layer 46 is disposed continuously from a position on the distal side of the proximal end of the marker 70 and on the proximal side of the distal end of the marker 70 to the vicinity of the distal end of the marker 70, for example. However, it is not arranged proximally from the position of the marker 70 (see FIG. 2).

The metal reinforcing layer 41 is formed by braiding a plurality of metal wires wound in one direction and a plurality of metal wires wound in a direction opposite to the one direction into a mesh. . This metal wire is made of, for example, a metal material such as stainless steel (SUS), although it is not particularly limited.
On the other hand, the resin reinforcing layer 46 is formed by braiding a plurality of resin wires wound in one direction and a plurality of resin wires wound in a direction opposite to the one direction into a mesh. ing. This resin wire is made of a resin material such as PA66 or PEEK. The resin hardness of the resin reinforcing layer 46 (resin hardness of the resin wire rod) is higher than that of the outer layer 33 of the tubular main body 10 .

As shown in FIGS. 2 and 3 , the marker 70 is embedded in the outer layer 33 and positioned around the lumen 31 , for example, in the distal small diameter region 21 of the tubular body 10 .
The marker 70 is made of radiopaque metallic material.
As described above, the marker 70 is fixed to the distal end of the metal reinforcing layer 41 and the proximal end of the resin reinforcing layer 46 . More specifically, for example, the marker 70 is arranged around the distal end of the metal reinforcing layer 41 and around the proximal end of the resin reinforcing layer 46 .
Here, in the case of the present embodiment, an adhesive layer 77 is arranged inside the marker 70, and the adhesive layer 77 impregnates the distal end portion 41a of the metal reinforcing layer 41 and the proximal end portion 46b of the resin reinforcing layer 46. are doing.
As a result, the distal end portion 41 a of the metal reinforcing layer 41 and the proximal end portion 46 b of the resin reinforcing layer 46 are fixed to the inner peripheral surface of the marker 70 . Further, for example, even if an impact is applied to the tubular body 10, the impact can be absorbed by the adhesive layer 77, so the structural strength of the distal end portion 10a can be improved.
More specifically, in the case of this embodiment, the adhesive layer 77 is arranged on the entire inner peripheral surface of the marker 70 . Further, the marker 70 is crimped and fixed to the distal end portion 41a of the metal reinforcing layer 41 and the proximal end portion 46b of the resin reinforcing layer 46, for example.
Further, in the case of the present embodiment, the region of the metal reinforcing layer 41 covered with the marker 70 is referred to as the tip portion 41a. Similarly, in the case of the present embodiment, the region of the resin reinforcing layer 46 covered with the marker 70 is referred to as the base end portion 46b.

The method for fixing the tip of the metal reinforcing layer 41 and the base end of the resin reinforcing layer 46 to the marker 70 is not particularly limited. A marker 70 is placed around the . Next, in the metal reinforcing layer 41, the portion on the tip side of the tip of the marker 70 is excised. Next, as shown in FIG. 5A, the resin reinforcing layers 46 and 46 are arranged coaxially with each other. Then, as shown in FIG. 5B, the marker 70 is moved relatively to the tip side (for example, the tip side of 1/2 of the total length of the marker 70) with respect to the metal reinforcing layer 41. Then, as shown in FIG. Thus, the marker 70 is arranged around the distal end of the metal reinforcing layer 41 and around the proximal end of the resin reinforcing layer 46 . As a result, the adhesive that forms the adhesive layer 77 is in contact with at least the distal end of the metal reinforcing layer 41 and is in contact with at least the proximal end of the resin reinforcing layer 46 . In this manner, the distal end portion 41 a of the metal reinforcing layer 41 and the proximal end portion 46 b of the resin reinforcing layer 46 are fixed to the marker 70 .
2 to 5B, the proximal end of the resin reinforcing layer 46 and the distal end of the metal reinforcing layer 41 are separated from each other in the axial direction. The tips of the metal reinforcing layers 41 may be in contact with each other (or may abut each other).

In the case of this embodiment, as shown in FIGS. 2 and 3 , a distal marker 75 is further provided on the distal side of the marker 70 and is embedded in the tubular body 10 coaxially with the tubular body 10 .
The tip of the resin reinforcing layer 46 terminates at the position of the tip side marker 75 , and the tip portion 46 a of the resin reinforcing layer 46 is pressed by the tip side marker 75 from the surroundings.
As a result, the integrity between the resin reinforcing layer 46 and the outer layer 33 is improved, so that the resin reinforcing layer 46 and the outer layer 33 can be removed together more reliably when removing the catheter 100 from the body cavity. .
More specifically, as an example, a second adhesive layer 79 is arranged on the inner peripheral surface of the tip side marker 75 , and the tip of the resin reinforcing layer 46 is attached to the tip side marker 75 by the second adhesive layer 79 . fixed for Furthermore, the tip side marker 75 and the resin reinforcing layer 46 are fixed to each other by caulking, for example.
In the case of this embodiment, the distal end 461 of the resin reinforcing layer 46 is arranged at a position closer to the proximal side than the distal end of the distal marker 75 and further distal than the proximal end of the distal marker 75 in the distal portion 10a. ing. However, the distal end 461 of the resin reinforcing layer 46 may be fixed to the proximal end of the distal marker 75, for example.
The distal marker 75 is made of a radiopaque metal material. The distal markers 75 are, for example, embedded in the outer layer 33 and arranged around the lumen 31 in the distal small diameter region 21 of the tubular body 10 .

Here, the tip side marker 75 has a smaller dimension in the axial direction than the marker 70, for example. In other words, the dimension of the distal marker 75 in the axial direction is smaller than the dimension of the marker 70 in the axial direction.
Thereby, it is possible to ensure good bendability of the distal end portion of the distal end portion 10a (the distal end portion of the tubular body 10).
The dimension of the marker 70 in the axial direction of the tubular body 10 is preferably 0.2 mm or more and 0.4 mm or less, and can typically be about 0.3 mm.
The dimension of the distal marker 75 in the axial direction of the tubular body 10 is preferably 0.1 mm or more and 0.3 mm or less, and can typically be about 0.15 mm.
In addition, the outer diameter of the marker 70 and the outer diameter of the distal marker 75 are set to substantially the same size, for example. Similarly, the inner diameter of the marker 70 and the inner diameter of the distal marker 75 are set to substantially the same size, for example.
The outer diameter of the marker 70 and the outer diameter of the tip side marker 75 are preferably 0.4 mm or more and 0.6 mm or less, and can typically be about 0.5 mm.
The inner diameter of the marker 70 and the inner diameter of the distal marker 75 are preferably 0.25 mm or more and 0.45 mm or less, and can typically be about 0.35 mm.

In the case of this embodiment, as shown in FIG. The grasping portion 90 has a connecting portion 91 for inserting an injector (syringe) (not shown) from its proximal end. A thread groove is formed on the outer periphery of the connecting portion 91 so that the syringe can be detachably fixed. A hub 92 is provided in the central portion of the grip portion 90 in the axial direction. A hollow is formed in the gripping portion 90 so as to penetrate the gripping portion 90 from the distal end to the proximal end in the axial direction. A proximal end portion of the tubular body 10 is fixed to the grip portion 90 . The hub 92 has two wings 93 facing each other across the axis of the grip 90 . By rotating the wings 93 about the axis of the grasping part 90, it is possible to perform a torque operation to rotate the entire tubular body 10, thereby adjusting the direction of the distal end of the tubular body 10 that has entered the body cavity. can.
A protector 94 is provided on the distal end side of the hub 92 and covers the proximal end portion of the tubular body 10 .

[Second embodiment]
Next, a second embodiment will be described with reference to FIG.
The catheter 100 according to this embodiment differs from the catheter 100 according to the first embodiment in the points described below, and is otherwise the same as the catheter 100 according to the first embodiment. It is configured.

As shown in FIG. 6, the catheter 100 does not have a distal marker 75 in this embodiment.
According to such a configuration, the distal end marker 75 is not embedded in the distal end portion 10a, and the distal end portion 46a of the resin reinforcing layer 46 is pressed by the outer layer 33 from the periphery. The bendability of the portion (the most distal portion of the tubular body 10) can be more sufficiently ensured.

[Third Embodiment]
Next, 3rd Embodiment is described using Fig.7 (a) and FIG.7(b).
The catheter 100 according to this embodiment differs from the catheter 100 according to the first or second embodiment in the following points, and in other respects, it is different from the first or second embodiment. It is configured in the same manner as the catheter 100 concerned.

In the case of this embodiment, as shown in FIGS. 7A and 7B, the number of resin wires forming the resin reinforcing layer 46 decreases toward the tip side.
As a result, a configuration in which the winding pitch of the resin reinforcing layer 46 becomes sparse toward the tip side can be realized, so that the resin reinforcing layer 46 can be made more flexible toward the tip side. Therefore, in the area where the resin reinforcing layer 46 is arranged, the distal end portion 10a can follow the curved shape of the guide wire satisfactorily while realizing appropriate pushability.

Here, in the case of the present embodiment, as shown in FIG. 7(b), the position where the number of threads of the resin wire is switched is between a pair of mutually intersecting resin wires (for example, the resin wire shown in FIG. 7(b)). 48, 49), and the lower layer side resin wire 49 of the pair of resin wires 48, 49 terminates at this position.
Here, the vicinity of the tip side of the intersection 47 means the tip side of the intersection 47 and the vicinity of the intersection 47 .
Further, the lower layer side means the radially inner side (the axial center side of the tubular main body 10).
As a result, the resin wire rods 49 on the lower layer side are pressed by the resin wire rods 48 on the upper layer side, so that the resin reinforcement layer 46 can be maintained well in a braided state with the resin wires. In addition, it is possible to prevent the tip of each resin wire of the resin reinforcing layer 46 from protruding outward from the outer peripheral surface of the tubular main body 10 .
More specifically, as shown in FIG. 7A, as an example, in the first region 44a, which is the region on the base end side of the resin reinforcing layer 46, the number of threads of the resin wire rod is 12. In the second region 44b, which is the central portion in the direction, the number of threads of the resin wire is eight. In the third region 44c, which is the region on the tip side of the resin reinforcing layer 46, the number of threads of the resin wire is four, as an example.
In the case of this embodiment, the resin wire on the lower layer side of the pair of resin wires terminates at all the positions where the number of threads of the resin wire is changed.
In addition, the resin wires may be fixed to each other by an adhesive or the like (not shown) at the intersection point 47 between the pair of resin wires that intersect each other.
The protruding length (L3 shown in FIG. 7B) of the distal end portion of the resin wire 49 on the lower layer side from the resin wire 48 on the upper layer side (L3 shown in FIG. 7B) is, for example, the dimension in the axial direction of the lattice shape including the intersection 47 ( It is preferably less than the dimension L2) shown in a), more preferably about twice the wire diameter of the resin wire (R1 shown in FIG. 7B).

Although each embodiment has been described above with reference to the drawings, these are examples of the present invention, and various configurations other than those described above can be adopted.

In the above-described third embodiment, the number of resin wires constituting the resin reinforcing layer 46 decreases toward the tip side, so that the winding pitch of the resin reinforcing layer 46 increases toward the tip side. Although a sparse example has been described, the present invention is not limited to this example. For example, by widening the winding pitch of the resin reinforcing layer 46 toward the tip side, It may be made more sparse towards. With such a configuration as well, the resin reinforcing layer 46 can be made more flexible toward the distal end side.

This embodiment includes the following technical ideas.
(1) an elongate tubular body having a lumen;
a marker embedded in the distal end of the tubular body in a coaxial arrangement with the tubular body;
a metal reinforcement layer made of braided metal wires and embedded in the tubular body in a coaxial arrangement with the tubular body;
a resin reinforcing layer composed of a braided resin wire and embedded in the tubular body in a coaxial arrangement with the tubular body;
has
The metal reinforcing layer and the resin reinforcing layer are arranged in the same layer,
the distal end of the metal reinforcing layer and the proximal end of the resin reinforcing layer terminate at the position of the marker;
A catheter in which the distal end portion of the metal reinforcing layer and the proximal end portion of the resin reinforcing layer are pressed from the periphery by the marker.
(2) an adhesive layer is disposed inside the marker;
The catheter according to (1), wherein the adhesive layer impregnates the distal end portion of the metal reinforcing layer and the proximal end portion of the resin reinforcing layer.
(3) further comprising a distal marker embedded in the tubular body in a position coaxial with the tubular body on the distal side of the marker;
The tip of the resin reinforcing layer terminates at the position of the tip-side marker,
The catheter according to (1) or (2), wherein the distal end portion of the resin reinforcing layer is pressed from the periphery by the distal marker.
(4) The catheter according to (3), wherein the distal marker has a smaller axial dimension than the marker.
(5) The catheter according to any one of (1) to (4), wherein the number of threads of the resin wire constituting the resin reinforcing layer decreases toward the distal end side.
(6) The position where the number of threads of the resin wire is switched is
It is positioned near the tip end side of the intersection point of the pair of resin wires that intersect each other,
The catheter according to (5), in which the resin wire on the lower layer side of the pair of resin wires terminates at this position.

10 Tubular body 21 Tip-side small-diameter region 22 Large-diameter region 23 Expanded-diameter region 30 Resin layer 31 Lumen 32 Inner layer 33 Outer layer 41 Metal reinforcing layer 41a Tip 411 Tip 44a First region 44b Second region 44c Third region 46 Resin reinforcing layer 46a Distal end 46b Base end 47 Intersection 48 First resin wire 49 Second resin wire 61 Distal lumen 70 Marker 75 Distal side marker 77 Adhesive layer 79 Second adhesive layer 80 Distal tip 90 Grip portion 91 Connecting portion 92 Hub 93 Feather 94 Protector 100 Catheter 461 Distal end 462 Base end

Claims (6)

an elongate tubular body having a lumen;
a marker embedded in the distal end of the tubular body in a coaxial arrangement with the tubular body;
a metal reinforcement layer made of braided metal wires and embedded in the tubular body in a coaxial arrangement with the tubular body;
a resin reinforcing layer composed of a braided resin wire and embedded in the tubular body in a coaxial arrangement with the tubular body;
has
The metal reinforcing layer and the resin reinforcing layer are arranged in the same layer,
the distal end of the metal reinforcing layer and the proximal end of the resin reinforcing layer terminate at the position of the marker;
A catheter in which the distal end portion of the metal reinforcing layer and the proximal end portion of the resin reinforcing layer are pressed from the periphery by the marker. An adhesive layer is disposed inside the marker,
2. The catheter according to claim 1, wherein the adhesive layer impregnates the distal end of the metal reinforcing layer and the proximal end of the resin reinforcing layer. further comprising a distal marker embedded in the tubular body coaxially with the tubular body on the distal side of the marker;
The tip of the resin reinforcing layer terminates at the position of the tip-side marker,
3. The catheter according to claim 1, wherein the distal end portion of the resin reinforcing layer is pressed from the periphery by the distal marker. 4. The catheter of claim 3, wherein the distal marker has a smaller axial dimension than the marker. The catheter according to any one of claims 1 to 4, wherein the number of threads of the resin wire constituting the resin reinforcing layer decreases toward the distal end side. The position where the number of threads of the resin wire is switched is
It is positioned near the tip end side of the intersection point of the pair of resin wires that intersect each other,
6. The catheter according to claim 5, wherein the resin wire on the lower layer side of the pair of resin wires terminates at the position.

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