JP2015089379A - Guide wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide wire, even when being collided with an affected area, capable of suppressing displacement of a bent part from a distal side to a proximal side, while securing substantial flexibility.SOLUTION: A guide wire 10 comprises a core shaft 20, a first coil body 30 formed by winding around the core shaft 20, and a second coil body 40 provided inside the first coil body 30. The first coil body 30 includes a loosely-wound portion 30b in which respective wires 31 are separated, and a first densely-wound portion 30a that is provided adjacent to the proximal side of the loosely-wound portion 30b and in which the respective wires 31 come into contact. At a boundary part of the loosely-wound portion 30b and the first densely-wound portion 30a, a first joining part 13 that joins the first coil body 30 and the second coil body 40 without being joined with the core shaft 20 is provided.

Description

  The present invention relates to a medical guide wire.

Conventionally, various guidewires have been proposed for guiding tubular organs such as blood vessels, gastrointestinal tracts, ureters, etc., and catheters that are used by being inserted into body tissues for treatment and examination.
For example, Patent Literature 1 discloses a guide wire that includes a main wire, an outer coil that covers the tip of the main wire, and an inner coil that is provided inside the outer coil. And the outer side coil and the inner side coil are joined by a joining material, and the joining material reaches the main wire.

Japanese Patent Laid-Open No. 3-70576

Usually, a guide wire is used in a state in which a distal end portion thereof is bent in order to improve guideability to the inside of a blood vessel that branches in a complicated manner in a three-dimensional space. When using such a guide wire, for example, when the tip portion collides with a lesion having high hardness, the bent state of the tip portion may be enlarged.
That is, in the guide wire, the bent portion may be displaced from the distal end side to the proximal end side and reach the large diameter portion of the core shaft. In such a state, the bent portion (the large-diameter portion of the core shaft) undergoes plastic deformation, making it difficult to restore the shape of the tip portion by manual work.
In the guide wire described in Patent Document 1 described above, when the distal end collides with a lesion having high hardness, the bent portion is displaced from the distal end side to the proximal end side and reaches the large diameter portion of the core shaft. The possibility is high and there was room for improvement in this regard. Furthermore, since both the outer coil and the inner coil are fixed to the core shaft, the distal end portion of the guide wire is inferior in flexibility, and there is room for improvement in followability and selectivity in the blood vessel.

  The present invention has been made in view of such circumstances, and suppresses the displacement of the bent portion from the distal end side to the proximal end side even when it collides with a lesioned portion while ensuring sufficient flexibility. It is an object of the present invention to provide a guide wire that can be used.

  In order to solve the above problems, a guide wire according to one embodiment of the present invention has the following characteristics.

Aspect 1 of the present invention is a guide wire including a core shaft, a first coil body wound around the core shaft, and a second coil body provided inside the first coil body. The first coil body includes a sparsely wound portion in which the strands are separated from each other, and a first densely wound portion provided adjacent to the proximal end side of the sparsely wound portion and in contact with the strands. A boundary portion between the winding portion and the first close winding portion is provided with a first joint portion that joins the first coil body and the second coil body without being joined to the core shaft.

  Aspect 2 of the present invention is the guide wire according to aspect 1, wherein the first coil body has a straight portion that extends from the proximal end toward the distal end and a curved portion that is formed on the distal end side of the straight portion. The first joint portion is provided in the straight portion.

Aspect 3 of the present invention is the guide wire according to Aspect 1 or Aspect 2, which is provided adjacent to the distal end side of the loosely wound portion and has a second densely wound portion with which each strand is in contact. The boundary portion between the loosely wound portion and the second densely wound portion is provided with a second joint portion that joins the first coil body and the second coil body without being joined to the core shaft. .

  Aspect 4 of the present invention is the guide wire according to aspect 3, wherein the first coil body has a straight portion extending from the proximal end toward the distal end, and a curved portion formed on the distal end side of the linear portion. The first joint portion and the second joint portion are provided in the straight portion.

  In the guide wire according to this aspect, the first coil body includes a loosely wound portion in which the strands are separated from each other, and a first densely wound wire that is provided adjacent to the proximal end side of the loosely wound portion and in contact with the strands. And a first joint that joins the first coil body and the second coil body without being joined to the core shaft is provided at a boundary portion between the loosely wound portion and the first densely wound portion. ing.

Here, for example, when the tip of the guide wire collides with a lesion having a high hardness, the stress generated thereby is first propagated to a soft sparsely wound portion in which the strands are separated and relaxed.

Further, a first densely wound portion is provided on the proximal end side of the loosely wound portion, and the rigidity of the guide wire is enhanced by the first joint portion at the boundary portion between the loosely wound portion and the first densely wound portion. . Therefore, most of the residual stress even in the state relaxed by the loosely wound portion is enhanced in rigidity by the boundary portion between the loosely wound portion and the first densely wound portion (the first joint portion and the first densely wound portion). The guide wire bends and its tip is deformed.

As a result, most of the stress generated during the collision with the lesioned part is weakened. As a result, such stress is less likely to propagate to the base end side than the boundary part between the loosely wound part and the first densely wound part. Become.

Therefore, even when the distal end of the guide wire collides with a lesion having high hardness, a problem that the bent state is displaced to the large diameter portion and the core shaft is plastically deformed is suppressed. As a result, the shape of the distal end portion of the guide wire can be easily restored manually, and the guide wire can be used continuously.

Furthermore, in the guide wire of this aspect, the 2nd coil body is provided in order to improve the restoring property. As a result, even if the distal end of the guide wire collides with a lesion having high hardness and the bent portion is displaced to the proximal end side, the shape of the distal end portion of the guide wire can be more easily restored manually. Is possible. Moreover, since the 1st junction part mentioned above joins a 1st coil body and a 2nd coil body, without joining to a core shaft, a softness | flexibility is ensured and the followable | trackability and selectivity in a blood vessel are improved. .

In the guide wire according to the second aspect, the first coil body has a straight portion extending from the proximal end toward the distal end, and a curved portion formed on the distal end side of the straight portion, and the first joint portion is a straight line. Provided in the department.

According to this, for example, when the distal end of the guide wire collides with a lesion having high hardness, as described above, in the straight portion that is a place where the bent portion is displaced from the distal end side to the proximal end side. The guide wire is bent at the boundary portion between the loosely wound portion and the first densely wound portion.

That is, in a straight portion that is easily bent when the tip of the guide wire collides with a lesion having high hardness, the rigidity of the boundary portion between the loosely wound portion and the first closely wound portion (the first joint portion and the first closely wound portion). The above-described stress is weakened at the elevated portion). As a result, it is possible to more reliably suppress the displacement of the bent portion from the distal end side to the proximal end side when the distal end of the guide wire collides with a lesion having high hardness.

The guide wire described in aspect 3 has a second densely wound portion provided adjacent to the distal end side of the loosely wound portion and in contact with each element wire, and a boundary between the loosely wound portion and the second densely wound portion. The part is provided with a second joint portion that joins the first coil body and the second coil body without joining the core shaft.

In such a guide wire, the rigidity of the guide wire is first enhanced by the second joint at the boundary portion between the second densely wound portion and the loosely wound portion from the distal end side to the proximal end side. Therefore, when the tip of the guide wire collides with a lesion having high hardness, the stress generated during the collision is caused by the boundary portion between the second densely wound portion and the loosely wound portion (the second densely wound portion and the second joint portion). The stress is reduced to some extent by concentrating on the portion where the rigidity is increased) and bending the guide wire there. Then, the remaining stress is propagated to a soft sparsely wound portion in which the strands are separated and alleviated.

Further, a first densely wound portion is provided on the proximal end side of the loosely wound portion, and the rigidity of the guide wire is enhanced by the first joint portion at the boundary portion between the loosely wound portion and the first densely wound portion. . Therefore, most of the residual stress even in the state relaxed by the loosely wound portion is enhanced in rigidity by the boundary portion between the loosely wound portion and the first densely wound portion (the first joint portion and the first densely wound portion). The guide wire bends, and the tip of the guide wire is deformed into a substantially trapezoidal shape when viewed from the side.

As a result, most of the stress generated during the collision with the lesioned part is weakened. As a result, such stress is less likely to propagate to the base end side than the boundary part between the loosely wound part and the first densely wound part. Become.

Therefore, even when the distal end of the guide wire collides with a lesion having high hardness, a problem that the bent state is displaced to the large diameter portion and the core shaft is plastically deformed is suppressed. As a result, the shape of the distal end portion of the guide wire can be easily restored manually, and the guide wire can be used continuously.

Further, since the second joint portion joins the first coil body and the second coil body without joining to the core shaft, the flexibility of the distal end portion of the guide wire is ensured and good followability within the blood vessel is achieved. Secured.

  In the guide wire described in aspect 4, the first coil body includes a straight portion that extends from the proximal end toward the distal end, and a curved portion that is formed on the distal end side of the linear portion. Two joint portions are provided in the straight portion. According to this, for example, when the distal end of the guide wire collides with a lesion having high hardness, as described above, in the straight portion that is a place where the bent portion is displaced from the distal end side to the proximal end side. The guide wire is bent into a substantially trapezoidal shape when viewed from the side.

That is, in a straight portion that is easily bent when the tip of the guide wire collides with a lesion having high hardness, the rigidity of the boundary portion between the second densely wound portion and the loosely wound portion (the second densely wound portion and the second joint portion). 3 points of the sparsely wound portion and the boundary portion between the sparsely wound portion and the first densely wound portion (where the rigidity is enhanced by the first joint portion and the first densely wound portion). Thus, the above-described stress is gradually reduced. As a result, it is possible to more reliably suppress the displacement of the bent portion from the distal end side to the proximal end side when the distal end of the guide wire collides with a lesion having high hardness.

FIG. 1 is a cross-sectional view of a guide wire according to the first embodiment. FIG. 2 is a schematic view showing a shape change when the guide wire according to the first embodiment collides with a lesioned part. FIG. 3 is a partially enlarged cross-sectional view showing a state in which the guide wire according to the first embodiment is bent. FIG. 4 is a cross-sectional view of a guide wire according to the second embodiment. FIG. 5 is a cross-sectional view of a guide wire according to the third embodiment. FIG. 6 is a partially enlarged cross-sectional view showing a state in which the guide wire according to the third embodiment is bent. FIG. 7 is a cross-sectional view of a guide wire according to the fourth embodiment.

[First embodiment]
A guide wire according to a first embodiment of the present invention will be described with reference to FIG. In FIG. 1, the left side is the distal end side inserted into the body, and the right side is the proximal end side operated by a technician such as a doctor. Each figure schematically shows a guide wire and is different from an actual dimensional ratio.

  As shown in FIG. 1, the guide wire 10 includes a core shaft 20, a first coil body 30 that covers the outer periphery of the distal end portion of the core shaft 20, and a second coil body 40 that is provided inside the first coil body 30. And.

First, the core shaft 20 will be described. The core shaft 20 has a first tapered portion 21a, a second tapered portion 21b, and a large diameter portion 21c in order from the distal end toward the proximal end side. The first tapered portion 21a has a tapered shape with a circular cross section, and is reduced in diameter toward the distal end side. The second taper part 21b has a circular taper shape in cross section and is reduced in diameter toward the tip side, and has a larger taper angle than the first taper part 21a. The large diameter portion 21c is formed in a columnar shape having a constant diameter.

In addition, arrangement | positioning and a dimension of the 1st taper part 21a, the 2nd taper part 21b, and the large diameter part 21c can be changed suitably for reasons, such as obtaining desired rigidity. For example, the number of the taper portions 21a and 21b and the angles of the taper portions 21a and 21b may be appropriately set as necessary. Moreover, you may provide the small diameter part formed in the front-end | tip part of the core shaft 20 by flat plate shape by press work.

The material for forming the core shaft 20 is not particularly limited, and for example, stainless steel (SUS304), a superelastic alloy such as a Ni-Ti alloy, piano wire, or the like can be used.

Next, the first coil body 30 will be described. In addition, although the 1st coil body 30 in 1st Embodiment is a single strip coil by which a strand is wound helically, the structure of the coil body 30 is not limited to this, A multi-strand coil (A stranded coil composed of a plurality of strands) may be used.

As shown in FIG. 1, the distal end of the first coil body 30 is fixed to the distal end of the core shaft 20 by the distal end side joint portion 11. The base end of the first coil body 30 is fixed to the core shaft 20 by the base end side joint portion 12. In addition, the substantially intermediate portion of the first coil body 30 that is located on the distal end side of the proximal end side joint portion 12 and on the proximal end side of the distal end side joint portion 11 is formed by the first joint portion 13 by the second coil body. 40 is fixed.

In the present embodiment, the first joint portion 13 joins the first coil body 30 and the second coil body 40 without joining to the core shaft 20. Thereby, compared with the guide wire which takes the structure which the 1st junction part 13 joins to the core shaft 20, it becomes possible to improve the softness | flexibility of a guide wire front-end | tip part. As a result, followability and selectivity in the blood vessel are improved.

Although it does not specifically limit as a material which forms the front end side junction part 11, the base end side junction part 12, and the 1st junction part 13, For example, Sn-Pb alloy, Pb-Ag alloy, Sn-Ag alloy, Au-Sn alloy And the like.

Although the material which forms the 1st coil body 30 is not specifically limited, A radiopaque strand or a radiation transparent strand can be used. The material of the radiopaque element wire is not particularly limited. For example, gold, platinum, tungsten, or an alloy containing these elements (for example, platinum-nickel alloy) may be used. it can. Further, the material of the radiation transmissive element wire is not particularly limited, but, for example, a stainless steel (SUS304, SUS316, etc.), a superelastic alloy such as a Ni-Ti alloy, a piano wire, or the like is used. Can do.

On the proximal end side (the right end side in FIG. 1) of the first coil body 30, there is provided a first closely wound portion 30 a that is closely wound so that adjacent strands 31 are in contact with each other. Further, the first coil body 30 includes a loosely wound portion 30b formed by loosely winding the strands 31 so that a predetermined gap exists between adjacent strands 31 on the tip side of the first densely wound portion 30a. Have.

In the present embodiment, since the loosely wound portion 30b is provided at the distal end portion of the first coil body 30, the flexibility of the distal end portion of the guide wire 10 is ensured. Thereby, it is possible to ensure good followability of the distal end portion of the guide wire 10 in a blood vessel that branches in a complicated manner in a three-dimensional space.

Moreover, in this embodiment, the 1st junction part 13 is provided in the boundary part of the 1st densely wound part 30a and the 1st loosely wound part 30b. Thereby, the rigidity of the guide wire 10 is remarkably improved in the vicinity K1 of the 1st junction part 13 including the base end part of the 1st sparse winding part 30b from the front end side of the guide wire 10 to the base end side.

Here, as shown in FIG. 2, for example, when the distal end collides with a lesion Y having a high hardness inside the blood vessel X, the distal end of the guide wire 10 is bent by the stress generated according to the collision. As such stress propagates from the distal end side to the proximal end side of the guide wire 10, the bent state may expand from the state indicated by the solid line to the state indicated by the dotted line.

That is, in the guide wire 10, the bent portion may be gradually displaced from the distal end side to the proximal end side and reach the large diameter portion of the core shaft 20. In such a state, the bent portion (the large diameter portion of the core shaft 20) undergoes plastic deformation, making it difficult to restore the shape of the tip portion by manual work.

However, in this embodiment, for example, when the distal end of the guide wire 10 collides with a lesion having high hardness, the stress generated thereby propagates to the flexible loosely wound portion 30b formed by separating the strands 31 first. To be relaxed.

Further, as shown in FIG. 1, a first densely wound portion 30a is provided on the proximal end side of the loosely wound portion 30b, and a guide wire is provided at a boundary portion K1 between the loosely wound portion 30b and the first densely wound portion 30a. 10 is enhanced by the first joint 13. Therefore, most of the residual stress even in the state relaxed by the loosely wound portion 30b is caused by the boundary portion K1 between the loosely wound portion 30b and the first densely wound portion 30a (by the first joint portion 13 and the first densely wound portion 30a). The guide wire 10 is bent into a substantially V shape when viewed from the side, and its distal end portion is deformed (see FIG. 3).

As a result, most of the stress generated upon collision with the lesioned part is weakened. As a result, such stress is more proximal to the boundary portion K1 between the loosely wound part 30b and the first densely wound part 30a. It becomes difficult to propagate.

Therefore, even when the tip of the guide wire 10 collides with a lesion having a high hardness, the problem that the bent state is displaced to the large diameter portion 21c and the core shaft 20 is plastically deformed is suppressed. As a result, the shape of the distal end portion of the guide wire 10 can be easily restored manually, and the guide wire 10 can be used continuously.

In addition, although the 2nd coil body 40 is a single strip coil by which a strand is wound helically, the structure of the 2nd coil body 40 is not limited to this, A multi-strand coil (several coils) It may be a stranded wire coil made of a strand. Moreover, in this embodiment, it is preferable to provide the 2nd coil body 40 in the location spaced apart from the front end side junction part 11 from a viewpoint of ensuring the softness | flexibility of the front-end | tip part of a guide wire.

Thus, in the guide wire 10 of this embodiment, the restoration property is improved by providing the second coil body 40. As a result, even if the distal end of the guide wire 10 collides with a lesion having high hardness and the bent portion is displaced to the proximal end side, the shape of the distal end portion of the guide wire 10 is more easily restored manually. It becomes possible to do.

[Second Embodiment]
A guide wire according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 4, the left side is the distal end side inserted into the body, and the right side is the proximal end side operated by a technician such as a doctor. In addition, about the component same as the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted and it demonstrates centering around difference below.

The guide wire 100 of the present embodiment is used in a state in which the distal end portion of the guide wire described in the first embodiment is curved in order to improve the guideability to the inside of the branched blood vessel (see FIG. 4). . At this time, the guide wire 100 (first coil body 130) has a straight portion 132a from the proximal end to the distal end direction. A curved portion 132b is provided on the distal end side of the straight portion 132a.

And as shown in FIG. 4, it is preferable that the 1st junction part 113 is provided in the linear part 132a. That is, it is preferable that the user bends the guide wire 100 on the distal end side with respect to the first joint portion 113.

According to this, for example, when the distal end of the guide wire 100 collides with a lesion portion having high hardness, the guide wire is in the straight portion 132a that is a location where the bent portion is displaced from the distal end side to the proximal end side. As shown in FIG. 3, 100 is bent into a substantially V shape in a side view. That is, in the straight portion 132a that is relatively easy to bend, the rigidity is enhanced by the boundary portion K1 between the first loosely wound portion 130b and the first densely wound portion 130a (the first densely wound portion 130a and the first joint portion 113). The stress is weakened as described above.

As a result, the displacement of the bent portion from the distal end side to the proximal end side of the guide wire 100 can be effectively suppressed, and the shape of the distal end portion can be easily restored by manual work.

[Third Embodiment]
A guide wire according to a third embodiment of the present invention will be described with reference to FIG. In FIG. 5, the left side is the distal end side inserted into the body, and the right side is the proximal end side operated by a technician such as a doctor. In addition, about the component same as the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted and it demonstrates centering around difference below.

The guide wire 200 according to the third embodiment differs from the first embodiment described above in the configuration of the first coil body. As shown in FIG. 5, the first coil body 230 of the present embodiment is provided with a first densely wound portion 230 a that is closely wound so that adjacent strands 231 come into contact with each other on the base end side. In addition, a first loosely wound portion 230b formed by loosely winding the strands 231 so that a predetermined gap exists between the adjacent strands 231 is provided on the tip side of the first densely wound portion 230a. doing.

Furthermore, the first coil body 230 has, on the tip side of the first loosely wound portion 230b, a second densely wound portion 230c that is closely wound so that adjacent strands 231 are in contact with each other, The second densely wound portion 230c has a second loosely wound portion 230d formed by sparsely winding the strands 231 so that a predetermined gap exists between adjacent strands 231.

  In the guide wire 200 of the present embodiment, the first joint portion 213 is provided at the boundary portion K1 between the first densely wound portion 230a and the first loosely wound portion 230b. The 2nd junction part 214 is provided in the boundary part K2 with the 2 densely wound part 230c.

  The first joint portion 213 and the second joint portion 214 join the first coil body 230 and the second coil body 40 without joining to the core shaft 20. This makes it possible to increase the flexibility of the distal end portion of the guide wire as compared to a guide wire that employs a configuration in which both the joint portions 213 and 214 are joined to the core shaft 20. As a result, followability and selectivity in the blood vessel are improved.

According to the guide wire 200 of the present embodiment, as shown in FIG. 5, first, from the distal end side to the proximal end side, first, at the boundary portion K2 between the second densely wound portion 230c and the first loosely wound portion 230b, The rigidity is enhanced by the second joint portion 214. Therefore, when the tip of the guide wire 200 collides with a lesion having a high hardness, the stress generated during the collision is a boundary portion K2 (second densely wound portion) between the second densely wound portion 230c and the first loosely wound portion 230b. 230c and the second joint 214 are concentrated at a portion where the rigidity is increased, and the guide wire 200 is bent there, whereby the stress is weakened to some extent. Then, the remaining stress is propagated to the flexible first loosely wound portion 230b formed by separating the strands and alleviated.

Furthermore, in this embodiment, the rigidity of the guide wire 200 is significantly increased by the first joint portion 213 at the boundary portion K1 between the first loosely wound portion 230b and the first densely wound portion 230a from the distal end side to the proximal end side. Yes. Therefore, most of the residual stress even in the state relaxed by the first loosely wound portion 230b is the boundary portion K1 between the first loosely wound portion 230b and the first densely wound portion 230a (the first joint portion 213 and the first densely wound portion 230b). The guide wire 200 is bent at that point as well, and the distal end portion of the guide wire 200 is deformed into a substantially trapezoidal shape in a side view as shown in FIG. As a result, most of the stress generated during the collision with the lesioned part is weakened. As a result, such stress is more proximal than the boundary portion K1 between the first loosely wound part 230b and the first densely wound part 230a. It becomes difficult to be transmitted to.

Therefore, even if the distal end portion of the guide wire 200 collides with a lesion having high hardness, there is a problem that the bent portion is displaced to the large diameter portion of the core shaft 20 and the core shaft 20 is plastically deformed. It is suppressed. As a result, the shape of the distal end portion of the guide wire 200 can be easily restored manually, and the guide wire 200 can be used continuously.

Furthermore, also in the present embodiment, the resilience of the core shaft 20 is further enhanced by the second coil body 40 as in the first embodiment. As a result, the shape of the distal end portion of the guide wire 200 can be restored more easily by manual work.

[Fourth Embodiment]
A guide wire according to a fourth embodiment of the present invention will be described with reference to FIG. In FIG. 7, the left side is the distal end side inserted into the body, and the right side is the proximal end side operated by an operator such as a doctor. In addition, about the component same as the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted and it demonstrates centering around difference below.

The guide wire 300 of the present embodiment is used in a state in which the distal end portion of the guide wire described in the third embodiment is curved in order to improve the guideability to the inside of the branched blood vessel. At this time, the guide wire 300 (first coil body 330) has a linear portion 332a from the proximal end to the distal direction. And it has the curved part 332b in the front end side of this linear part 332a.

In this embodiment, as shown in FIG. 7, it is preferable that the 1st junction part 313 and the 2nd junction part 314 are provided in the linear part 332a. That is, it is preferable that the user bends the guide wire 300 on the distal end side with respect to the second joint portion 314.

According to this, for example, when the distal end of the guide wire 300 collides with a lesion part having high hardness, the guide wire is in the linear portion 332a that is a place where the bent portion is displaced from the distal end side to the proximal end side. 300 is bent into a substantially trapezoidal shape in side view as shown in FIG.

That is, in the straight portion 332a that is relatively easy to bend, the rigidity is enhanced by the boundary portion K2 between the second densely wound portion 330c and the first loosely wound portion 330b (the second densely wound portion 330c and the second joint portion 314). Location), the first loosely wound portion 330b, and the boundary portion K1 between the first loosely wound portion 330b and the first densely wound portion 330a (the first joint portion 313 and the first densely wound portion 330a increase the rigidity. As described above, the stress is gradually reduced at the three locations.

As a result, the displacement of the bent portion from the distal end side to the proximal end side of the guide wire 300 can be effectively suppressed, and the shape of the distal end portion can be easily restored by manual work.

10, 100, 200, 300 ... guide wire 20 ... core shaft 30, 130, 230, 330 ... first coil body 40 ... second coil body 31,231 ... element wire 30b, 130b, 230b, 330b ... loosely wound portions 30a, 130a, 230a, 330a ... first densely wound portions 13, 113, 213, 313 ... first joint portions 132a, 332a ... linear portions 132b, 332b ... curved portions 230c, 330c ... second densely wound portions 214, 314 ... second joint portion

Claims (4)

A guide wire comprising a core shaft, a first coil body wound around the core shaft, and a second coil body provided inside the first coil body,
The first coil body includes a sparsely wound portion in which the strands are separated from each other, and a first densely wound portion provided adjacent to the proximal end side of the sparsely wound portion and in contact with each strand.
A boundary portion between the sparsely wound portion and the first densely wound portion is provided with a first joint portion that joins the first coil body and the second coil body without being joined to the core shaft. A guide wire characterized by The guide wire according to claim 1, wherein
The first coil body includes a straight portion that extends from the proximal end toward the distal end, and a curved portion that is formed on the distal end side of the linear portion, and the first joint portion is provided on the straight portion. A guide wire characterized by The guide wire according to claim 1 or 2,
It is provided adjacent to the distal end side of the loosely wound portion, and has a second densely wound portion with which each strand is in contact,
A boundary portion between the sparsely wound portion and the second densely wound portion is provided with a second joint portion that joins the first coil body and the second coil body without joining the core shaft. A guide wire characterized by A guide wire according to claim 3,
The first coil body includes a straight line portion extending from the proximal end toward the distal end, and a curved portion formed on the distal end side of the straight line portion, and the first joint portion and the second joint portion are A guide wire provided on a straight portion.