JP6685088B2 - Guide wire - Google Patents

Description

  The present invention relates to a guide wire that is inserted into blood vessels and digestive organs.

  Guide wires used for inserting catheters into blood vessels and digestive organs are already well known. Specifically, first, a guide wire is inserted into a blood vessel or a digestive organ to pass through a stenosis or the like, and then a catheter is advanced along the guide wire. Thus, the guide wire functions as a guide for guiding the catheter to the stenosis or the like.

  For example, in Patent Document 1, a core wire and an inner coil arranged at the tip of the core wire, an outer coil partially arranged above the inner coil along the length of the core wire, and formed on the tip of the core wire. And a tip made of solder, and a guide wire including the tip.

  In general, the guide wire is required to have flexibility so as not to damage inner walls such as blood vessels and digestive organs, and particularly excellent flexibility is required at the distal end portion.

Japanese Patent Publication No. 2006-511304

  However, the guide wire disclosed in Patent Document 1 has a problem in that the tip and the core wire are connected to each other and the tip end portion is poor in flexibility. On the other hand, when the distal end is flexible, information obtained from the distal end is difficult to be properly transmitted to the operator. Therefore, a guide wire having both flexibility and information transmission of the distal end is required.

  Therefore, it is an object of the present invention to provide a guide wire having both excellent flexibility at the distal end portion and excellent information transferability with which an operator can properly obtain information obtained from the distal end portion.

The present invention provides a core shaft, a stranded wire fixed to the core shaft so as to extend further toward the tip side than the tip of the core shaft, and a stranded wire formed by twisting a plurality of strands, and a tip portion of the core shaft And a first coil body that covers the stranded wire, and a tip chip that fixes the tip of the stranded wire and the tip of the first coil body, and the first coil body has a plurality of A stranded wire formed by twisting the elemental wires in a spiral shape, and the stranded wire of the first coil body is a hollow shape having no core wire in its center, A second coil body that covers the core shaft and the stranded wire in the coil body, is separated from the tip tip toward the proximal side, and has a tip fixed to the stranded wire; A tip of the second coil body and the twisted wire A fixing unit for fixing only a guide wire, characterized in that it comprises a second fixing portion for fixing the proximal end and the second coil of the first coil member.

  In such a configuration, since the distal tip and the core shaft are separated from each other and are not directly connected to each other, high flexibility is exhibited at the distal end portion of the guide wire. In addition, since each stranded wire in the first coil body is hollow, the first coil body is slightly displaced from each other in accordance with the bending stress, and the strain is reduced. Excellent flexibility. In addition, since the stranded wire of the first coil body does not have a core wire, it is also excellent in information transmission that transmits a minute vibration or the like generated in a part of the first coil body.

  Further, it is preferable that the stranded wire has a hollow shape with no core wire in its center.

  Such a stranded wire is excellent in strength because it consists of a plurality of strands. Furthermore, since the stranded wire does not include a core wire, the strands are relatively slightly displaced from each other according to bending stress, and strain is reduced. Therefore, the flexibility of the distal end portion of the guide wire becomes more excellent.

Further, in the above configuration, the core shaft and the stranded wire are covered in the first coil body, and the tip is separated from the tip tip to the proximal side, and the tip is the stranded wire. a configuration in which a second coil member which is fixed.

  With this configuration, since the second coil body is arranged inside the first coil body, it is possible to provide a guide wire having excellent torque transmissibility. Moreover, since the tip and the second coil body are separated from each other, the flexibility of the tip of the guide wire is sufficiently ensured. Further, since the distal end portion of the guide wire can be curved in all directions starting from the distal end of the second coil body, the distal end portion of the guide wire can be curved at a predetermined position, for example, in a blood vessel. The followability and selectivity can be improved.

  The guide wire of the present invention has excellent flexibility at the distal end portion and, in addition, has an excellent information transmission property that allows an operator to properly obtain information obtained from the distal end portion.

FIG. 3 is a cross-sectional view schematically showing the guide wire according to the first embodiment. (A) And (b) is sectional drawing which showed typically the stranded wire wire concerning Example 1, (c) and (d) are the stranded wires of the 1st coil body concerning Example 1 typically. It is the sectional view shown typically. FIG. 6 is a cross-sectional view schematically showing a guide wire according to a second example. FIG. 6 is a cross-sectional view schematically showing a twisted wire of a guide wire according to a third embodiment. FIG. 8 is a cross-sectional view schematically showing the guide wire according to the fourth embodiment. FIG. 9 is a cross-sectional view schematically showing a guide wire according to a fifth example.

  Hereinafter, examples in which the guide wire of the present invention is embodied will be described in detail. The present invention is not limited to the embodiments described below, and design changes can be made as appropriate. 1, FIG. 3, FIG. 5, and FIG. 6, the left side in the drawing is the distal end side (distal side) to be inserted into the body, and the right side is the proximal end part (proximal side) operated by the operator. .

[Example 1]
As shown in FIG. 1, the guide wire 1A includes a core shaft 2 made of a metal material in the shape of a tapered round bar having a small diameter on the distal side and a large diameter on the proximal side.

  A stranded wire 10 is arranged at the tip of the core shaft 2. Specifically, the stranded wire 10 is fixed to the core shaft 2 by a fixing portion 11 so as to extend further toward the tip side than the tip of the core shaft 2. The fixing portion 11 is configured by a known technique (for example, adhesive, brazing, or welding) using a known material. The structure of the stranded wire 10 will be described in detail later.

  In addition, the fixing portion 11 fixes the second coil body 30, which will be described later, together with the stranded wire 10 to the core shaft 2. With such a configuration, the material forming the fixed portion 11 can be supplied from the outside of the second coil body 30, and the fixed portion 11 can be easily formed. However, the configuration is not particularly limited, and only the stranded wire 10 may be fixed to the core shaft 2 by the fixing portion 11.

  The tip of the stranded wire 10 is fixed to the tip 5 having a smooth tip surface.

  Further, the guide wire 1A includes a first coil body 20 that covers the distal end portion of the core shaft 2 and the stranded wire 10. A tip end of the first coil body 20 is fixed to the tip chip 5, and a base end of the first coil body 20 is fixed to a second coil body 30 described later by a fixing portion 21. Further, the fixing portion 21 may be formed so as to fix the base end of the first coil body 20, the second coil body 30 described later, and the core shaft 2. The fixing portion 21 is configured by a known technique (for example, adhesive, brazing, or welding) using a known material. The structure of the first coil body 20 will be described in detail later.

  In addition, a densely wound proximal end side coil body 3 is arranged from the fixed portion 21 toward the proximal end side of the guide wire 1A. The outer diameter of the proximal coil body 3 is substantially the same as the outer diameter of the first coil body 20, and the tip of the proximal coil body 3 is fixed to the first coil body by the fixing portion 21. It is fixed to the base end of 20 and the core shaft 2. When the tip end of the base end side coil body 3 and the base end end of the first coil body 20 are fixed such that the pitches of the coils alternately bite, the first coil body 20, the base end side coil body 3 and the core shaft are fixed. This is preferable because the fixing of 2 becomes firm. The proximal end of the proximal coil body 3 is fixed to the core shaft 2 by a fixing portion 22. The fixing portion 22 is configured by a known technique (for example, adhesive, brazing, or welding) using a known material.

  The proximal end side coil body 3 is closely wound, but if necessary, for example, when brazing at the intermediate position or when adjusting the followability to a curved shape of a blood vessel, etc. Shaped portions may be formed.

  Further, the guide wire 1A is provided with a second coil body 30 that covers the core shaft 2 and the stranded wire 10 in the first coil body 20. More specifically, the second coil body 30 is composed of a multi-strand coil body composed of a plurality of strands, and is arranged at a distance from the tip tip 5 to the base end side, and the tip end thereof is fixed to the fixing portion 31. Is secured to the stranded wire 10 by means of and the base end is secured to the core shaft 2 by means of a securing portion 32. The fixing portions 31 and 32 are formed by a known technique using a known material (for example, adhesive, brazing, or welding).

The structures of the stranded wire 10 and the first coil body 20 will be described below.
As shown in FIG. 2A, the twisted wire 10 in the guide wire 1A is formed by twisting a plurality of strands 100, and a core wire is arranged at the center of the twisted wire 10. Instead, it is hollow with a void 101 formed in the center.

  Further, as shown in FIG. 2C, the first coil body 20 is formed by spirally winding a twisted wire 23 formed by twisting a plurality of strands 120, and further, the twisted wire 23. No core wire is arranged in the central portion of the, and a hollow 121 is formed in which a void 121 is formed.

  In the guide wire 1A, since the distal tip 5 and the core shaft 2 are separated from each other and are not directly connected to each other, high flexibility is exhibited at the distal end portion of the guide wire 1A.

  Furthermore, when the guide wire 1A is bent and bending stress is generated in the stranded wire 10, the strands 100 are relatively displaced as shown in FIG. Ten distortions are reduced. As a result, the stranded wire 10 can exhibit excellent flexibility.

  Furthermore, when the guide wire 1A is bent and bending stress is generated in the first coil body 20, the strands 120 of the stranded wire 23 are relatively positioned as shown in FIG. 2D. The twist of the twisted wire 23 is reduced. Thereby, the first coil body 20 can exhibit excellent flexibility. Further, since the stranded wire 23 of the first coil body 20 does not include a core wire, it becomes possible to effectively transmit the minute vibrations and the like generated in the first coil body 20 to the operator. Information transmission of the guide wire 1A is improved as a whole.

  In addition, in the guide wire 1A, the first coil body 20 is arranged on the outer side, whereas the second coil body 30 is arranged on the inner side, which is excellent in torque transmissibility. . Since the second coil body 30 is separated from the distal tip 5, the flexibility of the distal end portion of the guide wire 1A is sufficiently ensured. Further, since the distal end portion of the guide wire 1A can be curved in all directions with the distal end of the second coil body 30 as a base point, the distal end portion of the guide wire 1A can be curved at a predetermined position. The followability and selectivity in the blood vessel are improved.

  The second coil body 30 may be composed of a single coil in which a single wire is wound in a coil shape, but in terms of improving the torque transmissibility, the multi-strand coil body is as described above. More preferably,

[Example 2]
The guide wire 1B of Example 2 will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals, and the description will be omitted or simplified.

  In the guide wire 1B, only the first coil body 20 constitutes the outer coil body. With such a configuration, the number of parts is reduced, which has an advantage of simplifying the structure and manufacturing process of the guide wire 1B.

[Example 3]
A guide wire 1C of Example 3 will be described with reference to FIG. The same components as those in the first and second embodiments are designated by the same reference numerals, and the description thereof will be omitted or simplified.

  As shown in FIG. 4, the stranded wire 40 in the guide wire 1C is configured by arranging a core wire 41 at the center and twisting a plurality of strands 42 around the core wire 41. Although the stranded wire 40 has the core wire 41, the strength is improved. However, in order to further enhance the flexibility of the distal end portion of the guide wire 1C, the stranded wire 40 has the core wire 41 as shown in the first embodiment. It is more preferable that it is not hollow.

[Example 4]
A guide wire 1D of Example 4 will be described with reference to FIG. The same components as those in the first to third embodiments are designated by the same reference numerals, and the description thereof will be omitted or simplified.

  The guide wire 1D includes the first coil body 20, but does not include the second coil body 30. As described above, even in the configuration in which the second coil body 30 is not arranged, the distal tip 5 and the core shaft 2 are separated from each other and are not directly connected to each other, so that the distal end portion of the guide wire 1D is high. Flexibility is developed. In addition, in order to improve the torque transmissibility, the second coil body 30 is preferably arranged.

[Example 5]
A guide wire 1E of Example 5 will be described with reference to FIG. The same components as those in the first to fourth embodiments are designated by the same reference numerals, and the description will be omitted or simplified.

  The guide wire 1E is provided with a first coil body 60 having a taper shape in which the diameter is reduced toward the tip end side of the tip end side of the second coil body 30. By forming the taper portion 61 at the tip portion of the first coil body 60 as described above, the outer diameter of the tip tip 5 can be reduced, and the portion of the second coil body 30 closer to the tip side than the tip side can be made flexible. The property can be further improved.

  In addition to the above Examples 1 to 5, the size and shape of each part, the material, and the like can be freely selected as appropriate. For example, the number of strands of the stranded wires 10 and 40 can be changed appropriately. Similarly, the number of strands of the twisted wire 23 forming the first coil bodies 20 and 60 can be appropriately changed.

1A-1E Guide wire 2 Core shaft 5 Tip tip 10,40 Stranded wire 20,60 1st coil body 23 Stranded wire 30 2nd coil body 100 Elementary wire 120 Elementary wire

Claims (2)

A core shaft,
A stranded wire fixed to the core shaft so as to extend further toward the tip side than the tip of the core shaft, and a twisted wire formed by twisting a plurality of strands together,
A first coil body that covers the tip of the core shaft and the stranded wire;
A tip that fixes the tip of the stranded wire and the tip of the first coil body;
Equipped with
The first coil body is formed by spirally winding a twisted wire formed by twisting a plurality of strands, and the twisted wire of the first coil body has a core wire at its center. Is not hollow,
A second coil body that covers the core shaft and the stranded wire in the first coil body and is separated from the tip tip toward the base end side and has a tip fixed to the stranded wire is provided. A securing portion that secures only the tip of the second coil body and the stranded wire ,
A guide wire comprising: a base end of the first coil body and a second fixing portion that fixes the second coil body . The guide wire according to claim 1, wherein the stranded wire is hollow without a core wire in its center.

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