JP2014100265A - Guide wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide wire which is made compatible for the flexibility and the bending strength of the tip of the guide wire and which is improved in the fastness of the guide wire.SOLUTION: A guide wire 1 comprises: a core 2; an outer coil body 3 for covering at lest the tip of the core 2; an inner coil body 4 arranged on the inner side of the outer coil body 3 and covering the core 2; a leading end chip 5 for fixing the tip of the core 2 and the tip of the outer coil body 3; and an inner base end fixing portion 7 for fixing the base end of the inner coil body 4 and the core 2. The inner coil body 4 is a multi-row coil body formed of a plurality of strands. The tip of the inner coil body 4 has an inner tip fixing portion 8 which is not fixed on the core 2 and the outer coil body 3 but on which the individual strands forming the inner coil body 4 are fixed.

Description

  The present invention relates to a guide wire.

  Conventionally, guidewires have been developed that are inserted into tubular organs such as blood vessels, gastrointestinal tracts, and ureters, and body tissues, and used to guide medical devices and the like to target sites. In particular, in recent years, there has been a demand for a guide wire that combines the bending strength, flexibility, and robustness of the distal end of the guide wire from the medical field, and a guide for achieving both of these performances. Various wires have been proposed.

  For example, the guide wire described in Patent Document 1 includes a core wire, an inner coil body that covers the core wire, and an outer coil body that further covers the inner coil body, and both ends of the inner coil body are directly joined to the core. A guide wire and a guide wire in which both ends of the inner coil body are not joined to the core are described. The former secures bending strength and the latter secures flexibility.

  In addition, the guide wire described in Patent Document 2 includes a core and a multi-strand coil body formed by winding a plurality of strands and having both ends connected to the core. The mechanical strength of the tip end portion of the guide wire is improved by the strip coil body.

  In addition, the guide wire described in Patent Document 3 is configured such that the coil body includes a distal-side spiral coil body formed from a tungsten wire and a proximal-side spiral coil body formed from a steel wire. A connecting spiral coil body that joins the proximal end of the spiral coil body on the side and the distal end of the spiral coil body on the proximal end side to ensure the flexibility (flexibility) of the distal end portion of the guide wire ing.

US Pat. No. 5,345,945 US Publication No. US 2005/0027212 A1 JP-A-6-327775

  However, the guide wire described in Cited Document 1 ensures bending strength when both ends of the inner coil body are connected to the core, and ensures flexibility when both ends of the inner coil body are not connected to the core. Therefore, it was impossible to achieve both of these performances with a single guide wire.

  Moreover, since the guide wire described in the cited document 2 uses a multi-strand coil body, although the bending strength of the front-end | tip part of a guide wire is improved, the flexibility was inferior. Moreover, even if the multi-strand coil body described in the cited reference 2 is combined with the inner coil body described in the cited reference 1 and having both ends connected to the core, each strand constituting the multi-strand coil body is It will come off from the both ends, and after all, the robustness of the guide wire cannot be secured.

  Moreover, even if it was the guide wire described in the cited reference 3, although the flexibility of the guide wire was ensured, it was not able to make bending strength compatible.

  The present invention has been made in view of such problems, and provides a guide wire in which both the flexibility and bending strength of the distal end portion of the guide wire are compatible and the robustness of the guide wire is also improved. For the purpose.

  <1> The invention according to claim 1 is a core, an outer coil body that covers at least a tip of the core, an inner coil body that is disposed inside the outer coil body and covers the core, A tip chip for fixing the tip and the tip of the outer coil body; and an inner base end fixing part for fixing the base end of the inner coil body and the core, wherein the inner coil body includes a plurality of strands. The inner end of the inner coil body is fixed to the inner end of the inner coil body without being fixed to the core and the outer coil body. Features a guide wire having a portion.

  <2> The invention according to claim 2 is characterized in that, in the guide wire according to claim 1, the inner coil body has a guide wire whose coil outer diameter becomes narrower toward the tip.

  <3> The invention according to claim 3 is characterized in that, in the guide wire according to claim 1 or 2, the outer diameter of the wire forming the inner coil body becomes narrower toward the tip. To do.

  <4> The invention according to claim 4 is the guide wire according to any one of claims 1 to 3, wherein the inner distal end fixing portion and the inner proximal end fixing in the longitudinal direction of the inner coil body. And a guide wire having an intermediate fixing part that fixes the inner coil body and the outer coil body without being fixed to the core.

  <1> The guide wire according to claim 1, wherein the guide wire includes a core, an outer coil body that covers the core, an inner coil body that is disposed inside the outer coil body, A tip chip for fixing the tip and the tip of the outer coil body, and an inner base end fixing portion for fixing the base end of the inner coil body and the core, and the tip of the inner coil body is fixed to the core and the outer coil body Without having to be fixed, each wire forming the inner coil body has an inner tip fixing portion to which the inner wire is fixed, so that both the bending strength and flexibility of the tip portion of the guide wire are compatible and the inner tip fixing is performed. Since the fraying of the strands of the multi-strand coil body can be prevented by the portion, the robustness of the guide wire can be improved.

  <2> The guide wire according to claim 2 has a configuration in which the coil outer diameter of the inner coil body is narrowed toward the tip, whereby the outer periphery of the tip of the inner coil body and the inner peripheral surface of the outer coil body. Since the gap in the diametrical direction is ensured, the tip of the inner coil body is prevented from contacting the inner peripheral surface of the outer coil body even when the tip of the guide wire is curved. Further, fraying of the strands of the inner coil body can be further prevented, and further the robustness of the guide wire can be further ensured.

  <3> In the guide wire according to claim 3, since the outer diameter of the strand forming the inner coil body is narrowed toward the tip, the flexibility of the inner coil body is improved, The flexibility of the tip portion of the guide wire can be further improved.

  <4> The guide wire according to claim 4 is disposed between the inner distal end fixing portion and the inner proximal end fixing portion in the major axis direction of the inner coil body, and is not fixed to the core. Since it has an intermediate fixing part that joins the coil body and the outer coil body, the tip of the inner coil body and the outer peripheral surface of the core, or the contact between the tip of the inner coil body and the inner peripheral surface of the outer coil body Since it can prevent further, fraying of the strand of an inner coil body can be prevented further, and the robustness of a guide wire can be improved significantly by extension.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the guide wire which shows 1st Embodiment of this invention, (a) is a general view of a guide wire, (b) is an enlarged view of the cross section of the guide wire in the AA cross section of (a). It is. It is a block diagram of the guide wire which shows 2nd Embodiment of this invention, (a) is a general view of a guide wire, (b), (c), and (d) are the inside of the guide wire of (a). It is a modification of a coil body. It is a block diagram of the guide wire which shows 3rd Embodiment of this invention, (a) is a general view of a guide wire, (b) is an enlarged view of the cross section of the guide wire in the BB cross section of (a). It is. It is a block diagram of the guide wire which shows 4th Embodiment of this invention, (a) is a general view of a guide wire, (b) is sectional drawing of the strand which comprises the outer front end coil body of (a). FIG.

  Hereinafter, a guide wire of the present invention will be described based on a preferred embodiment shown in the drawings.

<First Embodiment>
BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the guide wire which shows 1st Embodiment of this invention, (a) is a general view of a guide wire, (b) is an enlarged view of the cross section of the guide wire in the AA cross section of (a). It is.

In FIG. 1A, for convenience of explanation, the left side is described as “tip” and the right side as “base end”.
Further, in FIG. 1A, in order to facilitate understanding, the length direction of the guide wire 1 is shortened and the entire guide wire 1 is schematically illustrated, so that the dimensional ratio is different from the actual one.
In FIG. 1B, the outer coil body is not shown for convenience of explanation.

  In FIG. 1A, a guide wire 1 includes a core 2, an outer coil body 3 that covers the tip of the core 2, and an inner coil body 4 that is disposed inside the outer coil body 3 and covers the tip of the core 2. And a tip chip 5 which is fixed to the tip of the core 2 and the tip of the outer coil body 3.

  The core 2 has a large-diameter portion, a tapered portion that is located on the distal end side of the large-diameter portion and whose outer diameter decreases toward the distal end, and a small-diameter portion that is located on the distal end side of the tapered portion. doing.

  The outer coil body 3 is composed of a single coil formed from a single wire, and is disposed so as to cover the taper portion and the small diameter portion of the core 2, and the tip of the outer coil body 3 is located at the tip of the core 2. The base end of the outer coil body 3 is fixed to the base end of the taper portion of the core 2 by the outer base end fixing portion 6.

  The inner coil body 4 is disposed so as to cover the small diameter portion of the core 2, and the base end of the inner coil body 4 is fixed to the small diameter portion of the core 2 by the inner base end fixing portion 7. Further, in FIG. 1B, the inner coil body 4 is composed of a multi-strand coil body formed of eleven strands 401, and the tip of the inner coil body 4 has a core 2 and an outer coil body 3. And the inner tip fixing portion 8 to which the strands 401 forming the inner coil body 4 are fixed.

  As described above, the guide wire 1 includes the core 2, the outer coil body 3 covering the core 2, the inner coil body 4 including the multi-row coil body disposed inside the outer coil body 3, the tip end of the core 2, and the outer side. A tip chip 5 for fixing the tip end of the coil body 3 and an inner base end fixing portion 7 for fixing the base end of the inner coil body 4 and the core 2 are provided. Since it has the inner front-end | tip fixing | fixed part 8 to which each strand 401 which forms the inner side coil body 4 was fixed without being fixed to the coil body 3, the bending strength and flexibility of the front-end | tip part of the guide wire 1 are provided. Since the inner tip fixing portion 8 can prevent the wire 401 of the inner coil body 4 from fraying, the robustness of the guide wire 1 can be improved.

  Note that the radial arrangement position of the inner coil body 4 inside the outer coil body 3 is between the outer peripheral surface of the inner coil body 4 and the inner peripheral surface of the outer coil body 3 and within the inner coil body 4. It is preferable to arrange the gap between the peripheral surface and the outer peripheral surface of the core 2.

  Further, when the guide wire 1 is bent, a gap is easily formed between the strands of the outer coil body 3 constituting the outer portion of the curved shape, and therefore the inner coil body is formed by the tip of the inner coil body 3 coming into contact with this gap. In consideration of prevention of fraying of the four strands 401, the inner coil body 4 has a distance between the outer circumference of the inner coil body 4 and the inner circumference of the outer coil body 3 such that the inner circumference of the inner coil body 4 and the core It is preferable to provide it at a position that is longer than the distance from the outer periphery.

  Hereinafter, the material of each element in the present embodiment will be described. The material for forming the core 2 is not particularly limited, and for example, a material such as a stainless steel (SUS304), a superelastic alloy such as a Ni-Ti alloy, or a piano wire can be used.

  The outer coil body 3 can use a wire having radiopacity or a wire having radiolucency. The material of the wire having radiopacity is not particularly limited. For example, gold, platinum, tungsten, or an alloy containing these elements (for example, platinum-nickel alloy) is used. Can do. Further, the material of the wire having radiation transparency is not particularly limited, but for example, stainless steel (SUS304, SUS316, etc.), super elastic alloy such as Ni-Ti alloy, piano wire, or the like is used. be able to. Moreover, it can also form from the strand in which a base end side has radiolucency and a front end side has radiopacity.

For the inner coil body 4, a wire having radiopacity or a wire having radiolucency can be used. The material of the wire having radiopacity is not particularly limited. For example, gold, platinum, tungsten, or an alloy containing these elements (for example, platinum-nickel alloy) is used. Can do. Further, the material of the wire having radiation transparency is not particularly limited, but for example, stainless steel (SUS304, SUS316, etc.), super elastic alloy such as Ni-Ti alloy, piano wire, or the like is used. be able to. Moreover, it can also form from the strand in which a base end side has radiolucency and a front end side has radiopacity.
Moreover, although the inner side coil body 4 is formed from the some strand 401, the material which forms the some strand 401 may be formed with the same material (example: SUS304), and a different material (SUS303). And tungsten).

  In addition, it is preferable that at least one of the outer coil body 3 or the inner coil body 4 is a coil body including a radiopaque element wire. Since at least one of the outer coil body 3 and the inner coil body 4 is formed of a radiopaque element wire, the visibility of the distal end portion of the guide wire 1 is improved. From the viewpoint of visibility, it is more preferable that the outer coil body 3 has radiopacity.

  A tip 5 for fixing the tip of the core 2 and the tip of the outer coil body 3, an outer base end fixing portion 6 for fixing the core 2 and the base end of the outer coil body 3, and the core 2 and the inner coil body 4. Examples of the material for forming the inner base end fixing portion 7 that fixes the base end and the inner tip fixing portion 8 that fixes each strand 401 of the inner coil body 4 include an adhesive such as an epoxy-based adhesive, , Silver solder, gold solder, zinc, Sn—Pb alloy, Pb—Ag alloy, Sn—Ag, Au—Sn alloy, etc., and use solder from the viewpoint of fixing strength and mechanical strength Is preferred. Further, the tip 5 may be formed by welding the tip of the core 2 and the tip of the outer coil body 3.

The guide wire 1 of this embodiment can be produced by the following method.
First, one end of a SUS304 wire, which is a material of the core 2, is peripherally ground by a centerless polishing machine to produce the core 2 with the outer diameter of the tip portion reduced.

  Further, a wire formed of SUS316 on the base end side and a Pt alloy on the tip end side is wound around a core bar for manufacturing the outer coil body 3, and the strand of the outer coil body 3 is turned into a core bar for manufacturing the outer coil body 3. Heat treatment is performed in a wound state, and then the outer coil body 3 is produced by extracting the core for producing the outer coil body 3.

  Moreover, the strands 401 of the inner coil body 4 made of a plurality of SUS304 (11 in this embodiment) are twisted together on the core bar for producing the inner coil body 4 using a twisting machine, and the inner coil body 4 Heat treatment is performed in a state where the coil wire 401 is twisted on the outer periphery of the core for producing the inner coil body 4, and then the core for producing the inner coil body 4 is extracted to produce the inner coil body 4.

  Next, a core metal for fixing the inner coil body 4 that can be inserted into the inner coil body 4 and has an outer diameter substantially the same as the inner circumference of the inner coil body 4 is inserted. For example, when the fixing member is an epoxy adhesive, the fixing core is made of a fluororesin, and the fixing member is an alloy solder such as Sn-Ag or Au-Sn. In some cases, a cored bar made of tungsten can be used. In addition, the core metal for fixing is not limited to these, and a material having low adhesiveness to the fixing member can be used. In a state where a core metal for fixing the inner coil body 4 is inserted into the inner coil body 4, a fixing member (in this embodiment, Sn—Ag alloy solder so as to cover the wire 401 at the tip of the inner coil body 4) Then, after fixing each element wire 401, the fixing core metal is removed from the inside of the inner coil body 4, and the inner coil body 4 to which the element wire 401 forming the tip is fixed is manufactured.

  Next, the distal end of the inner coil body 4 is inserted from the proximal end of the inner coil body 4, and the distal end of the inner coil body 4 is separated from the distal end of the core 2 in the proximal direction. 2 is fixed with metal solder (Sn—Ag alloy solder in this embodiment) to form the inner base end fixing portion 7.

  Next, the core 2 to which the inner coil body 4 is fixed is inserted from the base end of the outer coil body 3, and the position of the outer coil body 3 is set so that the tip of the outer coil body 3 is located at the tip of the core 2. In this state, the base end of the outer coil body 3 and the core 2 are fixed with metal solder (Sn—Ag alloy solder in this embodiment) to form the outer base end fixing portion 6.

  Next, the tip of the outer coil body 3 and the tip of the core are fixed with metal solder (Sn—Ag alloy solder in this embodiment) to form the tip chip 5. The distal end of the inner coil body 4 is disposed at a position spaced from the proximal end of the distal tip 5 in the proximal direction.

  Finally, while the shape of the tip of the tip 5 forms a round surface, the shape of the tip 5 is adjusted by polishing the outer periphery of the tip 5 with a device such as a router.

  In addition, you may produce the guide wire 1 not only by the manufacturing method and order mentioned above but by a well-known method.

  The inner coil body 4 is formed of 11 strands 401 in this embodiment, but is not limited to this number, and can be formed of 2 or more strands 401. Considering compatibility with strength, the inner coil body 4 is preferably formed of 6 to 18 strands 401.

Second Embodiment
Next, the guide wire 11 of 2nd Embodiment is demonstrated centering on a different point from 1st Embodiment using FIG. Portions common to the first embodiment are denoted by the same reference numerals in the drawing.
In FIG. 2, for ease of understanding, the length direction of the guide wire 11 is shortened and the entire guide wire 11 is schematically illustrated, so that the overall dimensions are different from the actual dimensions.
2 is a configuration diagram of the guide wire, (a) is an overall view of the guide wire, and (b), (c), and (d) are deformations of the inner coil body of the guide wire of (a). It is.

  2A, the guide wire 11 is the first in that it has an inner coil body 14 in which the outer diameter of the coil wire 402 is constant and the outer diameter of the coil decreases toward the tip. Different from the embodiment. In the inner coil body 14, the gap between the outer periphery of the tip end of the inner coil body 14 and the inner periphery of the outer coil body 3 is larger than the gap between the inner periphery of the tip end of the inner coil body 14 and the outer periphery of the core 2. Is also arranged to be larger.

  As described above, the guide wire 11 has a configuration in which the coil outer diameter of the inner coil body 14 decreases toward the tip while the outer diameter of the coil wire 402 forming the inner coil body 14 is constant. Since a gap in the diametrical direction between the outer periphery of the tip of the body 14 and the inner peripheral surface of the outer coil body 3 is ensured, even when the tip portion of the guide wire 11 is curved, Since the tip is prevented from coming into contact with the inner peripheral surface of the outer coil body 3, fraying of the strands of the inner coil body 14 can be further prevented, and the robustness of the guide wire 11 can be further ensured.

  Further, since the outer diameter of the coil wire 402 constituting the inner coil body 14 is constant, the bending strength of the guide wire 11 can be further increased.

  Such an inner coil body 14 can be manufactured by using a core bar for manufacturing the inner coil body 14 whose outer diameter is reduced.

A modification of this embodiment will be described below. Line segments L1 and L2 shown in FIG. 2B indicate the inner diameter of the inner coil body 24, and the line segment L1 and the line segment L2 are in a parallel relationship. The inner coil body 24 is an outer side of the strand 403 constituting the inner coil body 24 in a state where the inner circumference of the strand forming the inner coil body 24 is located on the line segments L1 and L2 (coil inner diameter is constant). The diameter decreases towards the tip. According to this modified example, contact between the tip of the inner coil body 24 and the inner peripheral surface of the outer coil body 3 can be prevented, and further, the robustness of the guide wire 11 can be further secured. .
Further, since the outer diameter of the coil wire 403 constituting the inner coil body 24 decreases toward the tip, the flexibility of the guide wire 11 can be further ensured.

  Such an inner coil body 24 can be manufactured by performing electrolytic polishing in a state where a cored bar is inserted into the inner coil body 24.

  Another modification is shown in FIG. A line segment L3 and a line segment L4 illustrated in FIG. 2C indicate the coil center diameter of the inner coil body 34, and the line segment L3 and the line segment L4 are in a parallel relationship. The inner coil body 34 is configured such that the center of the coil wire 404 is positioned on the line segments L3 and L4 (maintaining the coil center diameter), and the outer diameter of the coil wire 404 decreases toward the tip. have. The guide wire 11 including the inner coil body 34 has the flexibility of the guide wire 11 because the outer diameter of the coil wire 404 decreases toward the tip while the inner coil body 34 maintains the coil center diameter. Furthermore, it can be secured.

  Such an inner coil body 34 can be produced by performing electropolishing in a state in which the cored bar is not inserted into the inner coil body 34.

  Another modification is shown in FIG. A line segment L5 and a line segment L6 illustrated in FIG. 2D indicate the coil outer diameter of the inner coil body 44, and the line segment L5 and the line segment L6 are in a parallel relationship. The inner coil body 44 is configured such that the outer diameter of the coil wire 405 decreases toward the tip in a state where the outer periphery of the coil wire 405 is positioned on the line segments L5 and L6 (coil outer diameter is constant). have. The guide wire 11 including the inner coil body 44 has the flexibility of the guide wire 11 because the outer diameter of the coil wire 405 decreases toward the tip while the inner coil body 44 maintains the coil outer diameter. Furthermore, it can be secured.

  Such an inner coil body 44 can be manufactured by performing electropolishing in a state where the outer periphery of the inner coil body 44 is covered with an insulator such as a fluororesin.

  Further, the inner coil body 14 shown in FIG. 2A is subjected to the electrolytic polishing process used when the inner coil body 24 shown in FIG. It is also possible to produce the inner coil body 14 in which the outer diameter of the wire 402 decreases toward the tip. Further, without being limited thereto, the inner coil body 14 described in FIG. 2A is used for the electrolytic polishing used when the inner coil bodies 34 and 44 in FIGS. 2C and 2D are manufactured. Processing can also be applied.

<Third Embodiment>
Next, the guide wire 21 according to the third embodiment will be described with reference to FIG. 3 focusing on differences from the first embodiment. Portions common to the first embodiment are denoted by the same reference numerals in the drawing.
In FIG. 3, in order to facilitate understanding, the length direction of the guide wire 21 is shortened and the entire guide wire 21 is schematically illustrated, and thus the overall dimensions are different from the actual dimensions.
3 is a configuration diagram of the guide wire, (a) is an overall view of the guide wire, and (b) is an enlarged view of the cross section of the guide wire in the BB cross section of (a).

  3A and 3B, the guide wire 21 is located between the inner distal end fixing portion 8 and the inner proximal end fixing portion 7 in the major axis direction of the inner coil body 14 and is joined to the core 2. Instead, the second embodiment is different from the first embodiment in that an intermediate fixing portion 9 that fixes the inner coil body 4 and the outer coil body 3 is provided.

  As described above, the guide wire 21 of the present embodiment is disposed between the inner distal end fixing portion 8 and the inner proximal end fixing portion 7 and is fixed to the core 2 in the longitudinal direction of the inner coil body 4. And the intermediate fixing portion 9 that joins the inner coil body 4 and the outer coil body 3 is provided, so that the inner periphery of the tip of the inner coil body 3 and the outer periphery of the core 2 or the tip of the inner coil body 4 Since the contact between the outer circumference of the inner coil body and the inner circumferential surface of the outer coil body 4 can be further prevented, fraying of the strands 401 of the inner coil body 4 is further prevented, and the robustness of the guide wire 21 is extended. It can be greatly improved.

  Further, since the intermediate fixing portion 9 fixes the inner coil body 4 and the outer coil body 3 without being joined to the core 2, the bending strength is ensured while ensuring the flexibility of the distal end portion of the guide wire 21. Can be further improved.

  As the material of the intermediate fixing portion 9, the same material as that of the distal tip 5, the outer proximal end fixing portion 6, the inner proximal end fixing portion 7, and the inner distal end fixing portion 8 can be adopted. In this embodiment, the intermediate fixing part 9 is formed of Sn—Ag alloy solder.

  Further, when the intermediate fixing portion 9 is provided, the intermediate fixing portion 9 can be easily formed by forming a gap between the strands of the outer coil body 3 where the intermediate fixing portion 9 is to be provided. Further, the intermediate fixing portion 9 can be formed after the base end and the tip end of the outer coil body 3 are joined to the core 2, but the base end of the outer coil body 3 is not limited to this, and the core 2 After forming the outer base end fixing portion 6, the intermediate fixing portion 9 is formed, and then the tip of the outer coil body 3 and the tip of the core 2 are fixed to form the tip tip 5. May be.

  Moreover, in this embodiment, as shown in FIG.3 (b), the intermediate fixing | fixed part 9 exceeds the inner peripheral surface (broken line DL1) from the outer peripheral surface of the outer side coil body 3, and the inner peripheral surface of the inner side coil body 4 However, the present invention is not limited to this, and the gap between the inner peripheral surface (dashed line DL1) of the outer coil body 3 and the outer peripheral surface of the inner coil body may be filled. That is, the intermediate fixing part 9 may be filled in any form as long as it fixes only the inner coil body 4 and the outer coil body 3 in a state where it is not joined to the core 2.

<Fourth embodiment>
Next, a guide wire 31 according to the fourth embodiment will be described with reference to FIG. 4 focusing on differences from the third embodiment. Parts common to the third embodiment are denoted by the same reference numerals in the drawing.
In FIG. 4, in order to facilitate understanding, the length direction of the guide wire 31 is shortened and the entire guide wire 31 is schematically illustrated, and thus the overall dimensions are different from the actual dimensions.
4 is a configuration diagram of the guide wire, (a) is an overall view of the guide wire, and (b) is a diagram showing a cross-sectional view of the strand of the outer tip coil body.

  In FIG. 4A, the guide wire 31 includes an outer proximal coil body 131 in which the outer coil body 13 is located on the proximal side from the intermediate fixing portion 9 and an outer distal coil in which the outer coil body 13 is located on the distal side from the intermediate fixing portion 9. The third embodiment is different from the third embodiment in that the body 132 is configured.

  The distal end of the outer proximal end coil body 131 and the outer distal end coil body 132 are connected via the intermediate fixing portion 9.

  The outer distal end coil body 132 is designed so that the bending strength of the coil body is lower than that of the outer proximal end coil body 131.

  As described above, the guide wire 31 includes the outer proximal coil body 131 and the outer distal coil body 132 whose bending strength is lower than that of the outer proximal coil body 131. The flexibility of the tip portion of the wire 31 can be further improved.

  Further, since the distal end of the outer proximal end coil body 131 and the proximal end of the outer distal end coil body 132 are connected by the intermediate fixing portion 9, the difference in bending strength is the intermediate fixing portion 9. Although formed, the inner coil body 4 is positioned inside and fixed to the outer coil body 13 via the intermediate fixing portion 9, so that the stress concentration of the outer coil body is dispersed and the guide wire is distributed. The bending strength of 31 can also be ensured.

In this embodiment, the outer base end coil body 131 is a coil body made of a single wire of SUS304, and the outer front end coil body 132 has seven metal wires made of platinum as shown in FIG. A twisted metal stranded wire is used as a coil wire 232, and a coil body is formed using two of the coil wire 232.
Further, the present invention is not limited to this, and the strand 232 of the outer tip coil body 132 may be formed of a material different from platinum, or may be formed of a plurality of materials. Moreover, if the metal wire which forms a metal twisted wire is two or more, it will not specifically limit. Further, the number of the wires 232 constituting the outer tip coil body 132 may be one if the bending strength of the outer tip coil body 132 is set lower than the bending strength of the outer proximal coil body 131. Alternatively, it may be formed of three or more.

  Further, the present invention is not limited to the above-described embodiments, and various modifications can be made by those skilled in the art within the technical idea of the present invention.

For example, the intermediate fixing portion 9 included in the guide wire 21 of the third embodiment can be provided on the guide wire 11 of the second embodiment.
Further, the intermediate fixing portion 9 included in the guide wire 21 of the third embodiment and the guide wire 31 of the fourth embodiment has the inner distal end fixing portion 8 and the inner proximal end fixing portion 7 in the major axis direction of the inner coil body 4. If it is located between, it can provide in several places instead of only one place. Thereby, the bending strength of a guide wire can further be raised.

  Further, the strand 232 of the outer tip coil body 132 of the guide wire 31 of the fourth embodiment is a metal stranded wire obtained by twisting a plurality of metal wires in order to obtain excellent flexibility. If the bending strength of 132 is lower than the bending strength of the outer proximal end coil body 131, the outer distal end coil body 132 may be formed from one strand.

  Moreover, the inner side front end fixing | fixed part 8 can also be formed by welding instead of an adhesive agent or a metal brazing material. When the inner tip fixing portion 8 is formed by welding, it is preferable to use materials having the same melting temperature (a temperature difference of about 200 ° C.) of the strands constituting the inner coil body or the same material.

1, 11, 21, 31 Guide wire 2 Core 3, 13 Outer coil body 4, 14, 24, 34, 44 Inner coil body 5 Tip tip 6 Outer proximal end fixing portion 7 Inner proximal end fixing portion 8 Inner distal end fixing portion 9 Intermediate fixing part

Claims (4)

The core,
An outer coil body covering at least the tip of the core;
An inner coil body disposed inside the outer coil body and covering the core;
A tip for fixing the tip of the core and the tip of the outer coil body;
An inner base end fixing portion for fixing the base end of the inner coil body and the core;
The inner coil body is a multi-row coil body formed of a plurality of strands,
The guide wire, wherein the tip of the inner coil body has an inner tip fixing portion to which each strand forming the inner coil body is fixed without being fixed to the core and the outer coil body. The guidewire according to claim 1, wherein
The inner coil body is a guide wire whose coil outer diameter becomes narrower toward the tip. The guide wire according to claim 1 or 2,
A guide wire in which the outer diameter of the wire forming the inner coil body becomes narrower toward the tip. In the guide wire according to any one of claims 1 to 3,
In the major axis direction of the inner coil body, the inner coil body and the outer coil body are fixed without being fixed to the core, being arranged between the inner distal end fixing portion and the inner proximal end fixing portion. A guide wire having an intermediate fixing portion.