JP2016220730A - Guide wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide wire having excellent flexibility at a distal end and excellent information transmission properties allowing an operator to appropriately acquire information obtained from the distal end.SOLUTION: A guide wire 1A includes: a twisted wire 10 at a distal end of a core shaft 2; a distal tip 5 fixed to the distal end of the twisted wire 10; and a first coil body 20 for covering the core shaft 2 and the twisted wire 10. The first coil body 20 is formed by spirally winging a hollow twisted wire 23 therearound, the twisted wire having no core wire at a central part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a guide wire inserted into a blood vessel or a digestive organ.

  Guidewires used to insert catheters into blood vessels and digestive organs are already well known. Specifically, first, a guide wire is inserted into a blood vessel or digestive organ to pass through a stenosis or the like, and then the catheter is advanced along the guide wire. As described above, the guide wire functions as a guide for guiding the catheter to a stenosis portion or the like.

  For example, Patent Document 1 includes a core wire, an inner coil disposed at the tip of the core wire, an outer coil partially disposed above the inner coil along the length of the core wire, and the tip of the core wire. A guide wire including a chip made of solder is disclosed.

  In general, the guide wire is required to have flexibility so as not to damage the inner walls of blood vessels, digestive organs, and the like, and particularly, the tip portion is required to have excellent flexibility.

JP 2006-511304 Gazette

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

  Therefore, an object of the present invention is to provide a guide wire that has both excellent flexibility at the distal end portion and excellent information transmission that allows an operator to appropriately obtain information obtained from the distal end portion.

  The present invention includes 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 plurality of strands twisted together, and a tip portion of the core shaft And a first coil body that covers the stranded wire, and a tip that secures the tip of the stranded wire and the tip of the first coil body, and the first coil body includes a plurality of the first coil bodies. The twisted wire formed by twisting the strands of the first coil body is spirally wound, and the twisted wire of the first coil body has a hollow shape having no core wire at the center thereof. Guide wire.

  In such a configuration, since the tip end and the core shaft are separated from each other and are not directly connected to each other, high flexibility is exhibited at the tip 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 relative to each other in accordance with the bending stress, and distortion is reduced. Excellent flexibility. In addition, since the stranded wire of the first coil body does not have a core wire, it is excellent in the transmission of information for transmitting fine vibrations or the like generated in a part of the first coil body.

  Moreover, it is preferable that the said stranded wire is a hollow shape which does not have a core wire in the center part.

  Such a stranded wire is excellent in strength because it is composed of a plurality of strands. Further, since the stranded wire does not have a core wire, the strands are relatively slightly displaced in accordance with the bending stress, and the distortion is reduced. For this reason, 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 are spaced apart from the distal end tip to the proximal end side, and the distal end is the stranded wire. A configuration including the fixed second coil body is preferable.

  In such a configuration, since the second coil body is disposed inside the first coil body, it is possible to provide a guide wire with excellent torque transmission. In addition, since the tip tip and the second coil body are separated from each other, the flexibility of the tip portion of the guide wire is sufficiently ensured. Further, since the tip of the guide wire can be bent in all directions starting from the tip of the second coil body, the tip of the guide wire can be bent at a predetermined position, for example, in a blood vessel. Followability and selectivity can be improved.

  The guide wire of the present invention has an excellent flexibility at the tip portion, and in addition, has an effect of having an excellent information transmission property that enables an operator to appropriately obtain information obtained from the tip portion.

It is sectional drawing which showed typically the guide wire concerning Example 1. FIG. (A) And (b) is sectional drawing which showed typically the stranded wire concerning Example 1, (c) and (d) typically shows the stranded wire of the 1st coil body concerning Example 1. FIG. FIG. It is sectional drawing which showed typically the guide wire concerning Example 2. FIG. It is sectional drawing which showed typically the twisted wire of the guide wire concerning Example 3. FIG. FIG. 6 is a cross-sectional view schematically showing a guide wire according to a fourth embodiment. It is sectional drawing which showed typically the guide wire concerning Example 5. FIG.

  Hereinafter, the embodiment which materialized the guide wire of the present invention is described in detail. In addition, this invention is not limited to the Example shown below, A design change is possible suitably. 1, FIG. 3, FIG. 5 and FIG. 6, the left side in the figure is the tip side (distal side) inserted into the body, and the right side is the base end part (proximal side) operated by the operator. .

[Example 1]
As shown in FIG. 1, the guide wire 1 </ b> A includes a core shaft 2 made of a tapered round bar-shaped metal material with a distal end having a small diameter and a proximal end having a large diameter.

  A stranded wire 10 is disposed at the tip of the core shaft 2. Specifically, the stranded wire 10 is fixed to the core shaft 2 by the fixing portion 11 so as to extend further to the tip side than the tip of the core shaft 2. In addition, the said fixing | fixed part 11 is comprised by the well-known technique (For example, an adhesive agent, brazing, or welding) using a well-known material. The structure of the stranded wire 10 will be described in detail later.

  The fixing portion 11 also fixes a second coil body 30 described later together with the stranded wire 10 to the core shaft 2. By setting it as such a structure, the material which comprises the fixing | fixed part 11 can be supplied from the outer side of the 2nd coil body 30, and the fixing | fixed part 11 can be formed easily. However, it is not particularly limited, and only the stranded wire 10 may be fixed to the core shaft 2 by the fixing portion 11.

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

  Further, the guide wire 1 </ b> A includes a first coil body 20 that covers the distal end portion of the core shaft 2 and the stranded wire 10. The first coil body 20 has a distal end fixed to the distal tip 5 and a proximal end fixed to a second coil body 30 described later by a fixing portion 21. Moreover, the fixing | fixed part 21 may be formed so that the base end of the 1st coil body 20, the 2nd coil body 30 mentioned later, and the core shaft 2 may adhere. In addition, the said fixing | fixed part 21 is comprised by the well-known technique (For example, an adhesive agent, brazing, or welding) using a well-known material. The structure of the first coil body 20 will be described in detail later.

  In addition, a closely wound proximal end side coil body 3 is disposed from the fixed portion 21 toward the proximal end side of the guide wire 1A. The outer diameter of the proximal end side coil body 3 is substantially the same as the outer diameter of the first coil body 20, and the distal end of the proximal end side coil body 3 is fixed to the first coil body by the fixing portion 21. The base end 20 and the core shaft 2 are fixed. When the distal end of the base end side coil body 3 and the base end of the first coil body 20 are fixed so that the pitch of the coil is alternately engaged, the first coil body 20, the base end side coil body 3, and the core shaft are fixed. 2 is preferable because the fixing of 2 becomes strong. The base end of the base end side coil body 3 is fixed to the core shaft 2 by a fixing portion 22. In addition, the said fixing | fixed part 22 is comprised by the well-known technique (For example, an adhesive agent, brazing, or welding) using a well-known material.

  The proximal end side coil body 3 is formed in a tightly wound shape. For example, when performing brazing at an intermediate position, adjusting the followability to a curved shape such as a blood vessel, etc., loosely wound as necessary. A shaped part may be formed.

  Further, the guide wire 1 </ b> A 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 disposed away from the distal tip 5 toward the proximal end side, and the distal end is a fixing portion 31. The base end is fixed to the core shaft 2 by the fixing portion 32. In addition, the said adhering parts 31 and 32 are comprised by the well-known technique (for example, an adhesive agent, brazing, or welding) using a well-known material.

Below, the structure of the said stranded wire 10 and the said 1st coil body 20 is demonstrated.
As shown in FIG. 2A, the stranded wire 10 in the guide wire 1 </ b> A is formed by twisting a plurality of strands 100, and a core wire is disposed at the center of the stranded wire 10. Instead, it is a hollow shape in which a gap 101 is formed at the center.

  Further, as shown in FIG. 2 (c), the first coil body 20 is formed by spirally winding a stranded wire 23 formed by twisting a plurality of strands 120, and the stranded wire 23. A core wire is not arranged at the center of each other, and a hollow shape is formed in which a gap 121 is formed at the center.

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

  Further, when the guide wire 1A is bent and bending stress is generated in the stranded wire 10, the strands 100 are relatively displaced from each other as shown in FIG. Ten distortions are reduced. Thereby, the said stranded wire 10 can express the outstanding softness | 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. The distortion of the stranded wire 23 is reduced. Thereby, the said 1st coil body 20 can express the outstanding softness | flexibility. In addition, since the stranded wire 23 of the first coil body 20 does not have a core wire, it is possible to effectively transmit fine vibrations and the like generated in the first coil body 20 to the operator. As a whole, the information transmission performance of the guide wire 1A is improved.

  In addition, in the guide wire 1A, the first coil body 20 is disposed on the outer side, whereas the second coil body 30 is disposed on the inner side, so that torque transmission is excellent. . Since the second coil body 30 is separated from the distal tip 5, the distal end portion of the guide wire 1 </ b> A is sufficiently flexible. Further, since the distal end portion of the guide wire 1A can be bent in all directions starting from the distal end of the second coil body 30, the distal end portion of the guide wire 1A can be bent at a predetermined position. Followability and selectivity in the blood vessel are improved.

  The second coil body 30 may be constituted by a single coil obtained by winding one element wire in a coil shape. However, as described above, the multi-coil coil body is improved in terms of improving torque transmission. More preferably,

[Example 2]
A guide wire 1B according to the second embodiment will be described with reference to FIG. In addition, what has the structure similar to the said Example 1 attaches | subjects the same code | symbol, and abbreviate | omits or simplifies description.

  In the guide wire 1B, only the first coil body 20 constitutes an outer coil body. By adopting such a configuration, the number of parts is reduced, and thus there is an advantage that the structure and manufacturing process of the guide wire 1B are simplified.

Example 3
A guide wire 1C according to the third embodiment will be described with reference to FIG. In addition, what has the same structure as the said Example 1, 2 attaches | subjects the same code | symbol, and abbreviate | omits or simplifies description.

  As shown in FIG. 4, the stranded wire 40 in the guide wire 1 </ b> C is configured by placing a core wire 41 at the center and twisting a plurality of strands 42 around the core wire 41. The stranded wire 40 includes the core wire 41, so that the strength is improved. However, in order to further increase the flexibility of the tip 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 to make it hollow.

Example 4
A guide wire 1D according to the fourth embodiment will be described with reference to FIG. In addition, what has the structure similar to the said Examples 1-3 attaches | subjects the same code | symbol, and abbreviate | omits or simplifies description.

  The guide wire 1D includes the first coil body 20, but does not include the second coil body 30. As described above, even if the second coil body 30 is not disposed, the tip 5 and the core shaft 2 are separated from each other and are not directly connected to each other, so that the tip of the guide wire 1D is high. Flexibility is expressed. In order to improve torque transmission, it is preferable that the second coil body 30 is provided.

Example 5
A guide wire 1E according to the fifth embodiment will be described with reference to FIG. In addition, what has the structure similar to the said Examples 1-4 is attached | subjected the same code | symbol, and description is abbreviate | omitted or simplified.

  The guide wire 1 </ b> E includes a first coil body 60 having a tapered shape that is reduced in diameter toward the distal end side of the distal end side of the second coil body 30. By forming the tapered portion 61 at the tip of the first coil body 60 in this way, the outer diameter of the tip tip 5 can be reduced, and the tip side portion is more flexible than the tip of the second coil body 30. The property can be further improved.

  In addition to the first to fifth embodiments, the dimensional shape and material of each part can be freely selected as appropriate. For example, the number of strands of the stranded wires 10 and 40 can be changed as appropriate. Similarly, the number of strands of the stranded wire 23 constituting the first coil bodies 20 and 60 can be changed as appropriate.

1A to 1E Guide wire 2 Core shaft 5 Tip tip 10, 40 Stranded wire 20, 60 First coil body 23 Stranded wire 30 Second coil body 100 Strand 120 Strand

Claims (3)

A core shaft;
A stranded wire formed by twisting a plurality of strands fixed to the core shaft so as to extend further toward the tip side than the tip of the core shaft;
A first coil body covering the tip of the core shaft and the stranded wire;
A tip for fixing the tip of the stranded wire and the tip of the first coil body;
With
The first coil body is formed by spirally winding a stranded wire formed by twisting a plurality of strands, and the stranded wire of the first coil body has a core wire at the center thereof. A guide wire characterized by being not hollow. The guide wire according to claim 1, wherein the stranded wire has a hollow shape that does not have a core wire at a center portion thereof. A second coil body that covers the core shaft and the stranded wire in the first coil body and is spaced apart from the distal tip toward the proximal end and has a distal end fixed to the stranded wire. The guide wire according to claim 1 or claim 2 provided.

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