JP2017070803A - Guide wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide wire capable of eliminating such a malfunction that one of adjacent element wires runs onto the other element wire.SOLUTION: A guide wire 10 includes a shaft 12, an outside coil body 20 that is wound around a tip part of the shaft 12, and an inside coil body 40 that is provided inside the outside coil body 20 and wound around the shaft 12. In the outside coil body 20, a plurality of strands 22 configured by twisting a plurality of element wires 21 together are spirally wound. A winding direction of the outside coil body 20 is opposite to a winding direction of the inside coil body 40. The interference between the outside coil body 20 and the inside coil body 40 suppresses the inward deformation of the outside coil body 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a guide wire used as a medical instrument inserted into a body cavity for the purpose of treatment or examination.

  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, the prior art document 1 discloses a guide wire including a core wire, an outer coil disposed at the tip of the core wire, and an inner coil disposed inside the outer coil.

JP-A-8-317989

Usually, in the guide wire shown in Patent Document 1 described above, for example, when a rotating operation is applied in a direction in which the outer coil body is tightened, the contact pressure increases by tightening the strands, and accordingly, the outer coil body is increased. Deforms inward to reduce the diameter. If such deformation is excessive, there is a possibility that one of the adjacent strands may run on the other strand.
Also, for example, when the lesion is hard, the degree of stenosis of the lesion is large, or the lesion is occluded, when inserting a guide wire into the interior of these lesions, Sufficient torque transmission is required. In order to satisfy these requirements, it is conceivable to use a coil body in which a plurality of stranded wires obtained by twisting a plurality of strands are spirally wound.
However, when such a coil body is rotated in the tightening direction, the strands are tightened together and the stranded wires are tightened firmly to each other, so that the contact pressure is further increased. This may cause excessive deformation of the coil body inward. As a result, as described above, it is easy for one of the adjacent strands to run up. That is, there is still room for improvement in terms of solving such a problem that one of the adjacent strands rides on the other strand.

  This invention is made in view of such a situation, and it is a subject to provide the guide wire which can eliminate the malfunction that one strand climbs on the other strand in an adjacent strand. And

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

The guide wire according to the first aspect of the present invention includes a shaft, an outer coil body wound around the tip of the shaft, an inner coil body provided around the outer coil body and wound around the shaft, In particular, the outer coil body is formed by spirally winding a plurality of strands obtained by twisting a plurality of strands, and the winding direction of the outer coil body and the inner coil The winding direction is opposite to the winding direction of the body, and the outer coil body and the inner coil body interfere with each other, whereby deformation of the outer coil body inward is suppressed.

  Aspect 2 of the present invention is the guide wire according to aspect 1, wherein the inner coil body is composed of a stranded wire obtained by twisting a plurality of strands.

Aspect 3 of the present invention is the guide wire according to aspect 1, wherein the inner coil body is formed by spirally winding a plurality of stranded wires obtained by twisting a plurality of strands. .

The guide wire according to the first aspect of the present invention includes a shaft, an outer coil body wound around the tip of the shaft, an inner coil body provided on the inner side of the outer coil body and wound around the shaft, In particular, the outer coil body is formed by spirally winding a plurality of strands obtained by twisting a plurality of strands, and the winding direction of the outer coil body and the winding of the inner coil body The direction is opposite to the direction, and the outer coil body and the inner coil body interfere with each other, whereby the inward deformation of the outer coil body is suppressed.

  Normally, when a rotating operation is applied in the direction in which such an outer coil body is tightened, the contact pressure increases by tightening the strands at the same time as the strands are tightened together. It deforms inward to reduce the diameter. And when such a deformation | transformation is excessive, the malfunction that one strand (twisted wire) rides on the other strand (stranded wire) in an adjacent strand (stranded wire) arises.

However, in this aspect, since the winding direction of the outer coil body and the winding direction of the inner coil body are opposite directions, when the outer coil body is deformed inward so as to be tightened and reduced in diameter, The inner coil body has its outer diameter expanded by loosening the close contact between the wires. As a result, the two coil bodies interfere with each other, so that excessive deformation inward of the outer coil body is suppressed, and one of the adjacent strands (twisted wires) as described above is twisted. ) Can run over the other strand (stranded wire).

Moreover, the guide wire which concerns on aspect 2 of this invention is a guide wire of aspect 1, Comprising: An inner side coil body consists of a twisted wire which twisted together several strands. Such a coil body can move relatively minutely between the strands, and has flexibility and high flexibility. Therefore, when a rotation operation in a predetermined direction is applied, the strands Is easy to loosen, and the outer diameter is expanded accordingly, and the width of the diameter expansion is increased.

That is, if the outer coil body is deformed inward so that the outer coil body is tightened to reduce the diameter, the outer diameter of the inner coil body is easily expanded. As a result, both coil bodies are likely to interfere with each other, so that excessive deformation inward of the outer coil body is effectively suppressed, and one of the adjacent strands (stranded wires) as described above can be prevented. It is possible to reliably avoid the problem that the strand (stranded wire) rides on the other strand (stranded wire).

Furthermore, the guide wire which concerns on aspect 3 of this invention is a guide wire of aspect 1, Comprising: The inner side coil body is formed by spirally winding a plurality of stranded wires obtained by twisting a plurality of strands. . Since the coil body can be moved relatively minutely between the strands forming the stranded wire in addition to between the stranded wires, the coil body has a degree of freedom compared to the inner coil body of aspect 2 described above. Therefore, flexibility is further enhanced. Such an inner coil body is more easily loosened when a rotation operation in a predetermined direction is applied, and accordingly, the outer diameter can be easily expanded, and the width of the diameter expansion is further increased. It becomes.

That is, if the outer coil body is deformed inward so as to be reduced in diameter by being tightened, the outer diameter of the inner coil body is greatly expanded as compared with the inner coil body of aspect 2 described above. become. As a result, the two coil bodies more reliably interfere with each other, so that excessive deformation inward of the outer coil body is suppressed. As described above, one of the adjacent strands (stranded wires) It is possible to more reliably avoid the problem that (twisted wire) rides on the other strand (twisted wire).

FIG. 1 is an enlarged partial sectional view showing a guide wire according to the first embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a cutaway side view showing the guide wire according to the first embodiment of the present invention. FIG. 4 is an enlarged partial cross-sectional view showing a guide wire according to a second embodiment of the present invention. FIG. 5 is a perspective view showing an inner coil body according to the second embodiment of the present invention. 6 is a cross-sectional view taken along the line BB in FIG. FIG. 7 is an enlarged partial cross-sectional view showing a guide wire according to a third embodiment of the present invention. 8 is a cross-sectional view taken along the line CC in FIG.

First, the guide wire of this invention is demonstrated based on embodiment shown in drawing.
[First embodiment]
FIG. 1 is an enlarged partial cross-sectional view showing a first embodiment of the guide wire of the present invention. 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. In addition, this figure shows a guide wire schematically and is different from an actual dimensional ratio including the cross-sectional shape of the coil body formed from a stranded wire.

The guide wire 10 shown in FIG. 1 is used for the treatment of lower limb blood vessels by the Cross Over method, for example. The guide wire 10 includes a shaft 12 and an outer coil body 20 that covers the outer periphery of the distal end portion of the shaft 12.

First, the shaft 12 will be described. The shaft 12 has a small diameter portion 12a, a tapered portion 12b, and a large diameter portion 12c in order from the distal end toward the proximal end side. The small diameter portion 12 a is the most distal portion of the shaft 12 and is the most flexible portion of the shaft 12. The small diameter portion 12a is formed in a flat plate shape by press working. The tapered portion 12b has a tapered shape with a circular cross section, and is reduced in diameter toward the distal end side. The large diameter part 12c has a larger diameter than the small diameter part 12a.

A material for forming the shaft 12 is not particularly limited, and for example, stainless steel (SUS304), a superelastic alloy such as a Ni-Ti alloy, a piano wire, a cobalt alloy, or the like can be used.

Next, the outer coil body 20 will be described. As shown in FIGS. 1 and 2, in the outer coil body 20 of the present embodiment, a plurality of stranded wires 22 obtained by twisting a plurality of strands 21 are spirally wound (eight in the present embodiment). It becomes. As shown in FIG. 2, the stranded wire 22 includes a core wire 22a and six side wires 22b wound so as to cover the outer periphery of the core wire 22a. In the present embodiment, as shown in FIG. 3, the winding direction of the outer coil body 20 is a clockwise direction toward the right in the drawing.

In addition, as a material which forms the core wire 22a and the side wire 22b, it is not specifically limited, For example, stainless steel, such as martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, austenite, ferrite duplex stainless steel or precipitation hardening stainless steel, Examples thereof include superelastic alloys such as Ni-Ti alloys, platinum, gold, tungsten, tantalum, iridium, and alloys thereof which are radiopaque metals.

The distal end of the outer coil body 20 is fixed to the distal end of the shaft 12 by a distal end joint portion 31. On the other hand, the base end of the outer coil body 20 is fixed to the shaft 12 by a base end joint 33. Although it does not specifically limit as a material which forms the front end side junction part 31 and the base end side junction part 33, For example, metal solders, such as Sn-Pb alloy, Pb-Ag alloy, Sn-Ag alloy, Au-Sn alloy, are mentioned It is done.

In the guide wire 10 of this embodiment, an inner coil body 40 is provided inside the outer coil body 20. The inner coil body 40 in the present embodiment is a single coil formed by winding a wire 41 in a spiral shape.

Although the material which forms the inner side coil body 40 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.

The distal end of the inner coil body 40 is joined to the distal end of the shaft 12 by the distal joint portion 31. On the other hand, the base end of the inner coil body 40 is joined to the shaft 12 by a base end joint portion 35. The material for forming the base end side joining portion 35 is not particularly limited, and examples thereof include metal brazing such as Sn—Pb alloy, Pb—Ag alloy, Sn—Ag alloy, and Au—Sn alloy.

As shown in FIG. 3, the winding direction of the inner coil body 40 is a counterclockwise direction toward the right on the drawing. That is, the winding direction of the outer coil body 20 and the winding direction of the inner coil body 40 are opposite to each other.

  Usually, when a rotating operation is applied in the direction in which the outer coil body 20 is tightened, the strands 21 are tightened at the same time, and the stranded wires 22 are also tightened together to increase the contact pressure. The coil body 20 is deformed inward so as to reduce the diameter. And when such a deformation | transformation is excessive, the malfunction that one strand 21 (stranded wire 22) rides on the other strand 21 (stranded wire 22) in the adjacent strand 21 (stranded wire 22) may arise. There is sex.

However, in the present invention, since the winding direction of the outer coil body 20 and the winding direction of the inner coil body 40 are opposite to each other, the outer coil body 20 is tightened and deformed inward so as to reduce its diameter. In the inner coil body 40, the close contact between the strands 41 is loosened and the outer diameter is expanded. As a result, the two coil bodies 20, 40 interfere with each other, so that excessive deformation inward of the outer coil body 20 is suppressed, and one of the adjacent strands 21 (stranded wire 22) as described above is suppressed. This makes it possible to avoid the problem that one strand 21 (stranded wire 22) rides on the other strand 21 (stranded wire 22).

[Second Embodiment]
FIG. 4 is an enlarged partial cross-sectional view showing a second embodiment of the guide wire of the present invention. 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, this figure shows a guide wire schematically and is different from an actual dimensional ratio including the cross-sectional shape of the coil body formed from a stranded wire.

  In the first embodiment described above, the single inner coil body 40 in which the strands are spirally wound is employed. On the other hand, in the guide wire 100 of the present embodiment, as shown in FIGS. 5 and 6, a hollow inner coil made of a stranded wire in which a plurality (10 in the present embodiment) of strands 141 are twisted together. A body 140 is used.

  Such an inner coil body 140 can be relatively moved between the strands 141, has a high degree of freedom, and is highly flexible. Therefore, when a rotation operation in a predetermined direction is applied, The strands 141 are easy to loosen, and the outer diameter is expanded accordingly, and the width of the diameter expansion is increased.

That is, if the outer coil body 20 is deformed inward so as to be tightened and reduced in diameter, the outer diameter of the inner coil body 140 is increased compared to the inner coil body of the first embodiment described above. It is easy to be done. As a result, the two coil bodies 20 and 140 are likely to interfere with each other, so that excessive deformation of the outer coil body 20 inward is effectively suppressed, and the adjacent strand 21 (twisted as described above) In the wire 22), it is possible to reliably avoid the problem that one strand 21 (stranded wire 22) rides on the other strand 21 (stranded wire 22).

[Third embodiment]
FIG. 7 is an enlarged partial cross-sectional view showing a third embodiment of the guide wire of the present invention. 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, this figure shows a guide wire schematically and is different from an actual dimensional ratio including the cross-sectional shape of the coil body formed from a stranded wire.

As shown in FIGS. 7 and 8, the inner coil body 240 in the guide wire 200 of the present embodiment has a plurality of spiral wires 242 formed by twisting a plurality of strands 241 (eight in this embodiment). It is wound. More specifically, as shown in FIG. 8, the inner coil body 240 has a spiral wire 242 formed of a core wire 242a and six side wires 242b wound around the outer periphery of the core wire 242a. 8 rolls.

  The material for forming the core wire 242a and the side wire 242b in the inner coil body 240 is not particularly limited, and for example, martensitic stainless steel, ferrite stainless steel, austenitic stainless steel, austenite, ferrite duplex stainless steel, or precipitation hardening. Examples thereof include stainless steel such as stainless steel, superelastic alloy such as Ni—Ti alloy, platinum, gold, tungsten, tantalum, iridium, and alloys thereof which are radiopaque metals.

The inner coil body 240 having such a configuration can be moved relatively minutely between the strands 241 forming the stranded wire 242 in addition to between the stranded wires 242, and therefore the second embodiment described above. Compared with the inner coil body of the form, there is a degree of freedom and the flexibility is further enhanced. Such an inner coil 240 body is more easily loosened when a rotation operation in a predetermined direction is applied, and accordingly, the outer diameter can be easily expanded, and the width of the diameter expansion is further increased. It will be.

In other words, if the outer coil body 20 is deformed inward so as to be tightened and reduced in diameter, the outer diameter of the inner coil body 240 is significantly larger than that of the inner coil body of the second embodiment described above. Can be expanded. As a result, the two coil bodies 20 and 240 more reliably interfere with each other, so that excessive deformation inward of the outer coil body 20 is suppressed, and the adjacent strand 21 (twisted wire 22) as described above. ), The problem that one strand 21 (stranded wire 22) rides on the other strand 21 (stranded wire 22) can be avoided more reliably.

10, 100, 200 ... guide wire 12 ... shaft 20 ... outer coil body 21 ... element wire 22 forming outer coil body ... twisted wires 40,140 forming outer coil body, 240 ... inner coil bodies 41, 141, 241 ... strands forming the inner coil bodies 242 ... stranded wires forming the inner coil bodies

Claims (3)

A guide wire comprising a shaft, an outer coil body wound around the tip of the shaft, and an inner coil body wound around the shaft provided inside the outer coil body,
The outer coil body is formed by spirally winding a plurality of strands obtained by twisting a plurality of strands,
The winding direction of the outer coil body and the winding direction of the inner coil body are opposite to each other, and the outer coil body and the inner coil body interfere with each other, whereby the outer coil body is deformed inward. Guide wire characterized by being suppressed. The guide wire according to claim 1, wherein
The inner coil body is composed of a stranded wire obtained by twisting a plurality of strands. The guide wire according to claim 1, wherein
The guide coil, wherein the inner coil body is formed by spirally winding a plurality of stranded wires obtained by twisting a plurality of strands.