JP6386991B2 - Guide wire - Google Patents

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. In general, a guide wire includes a core shaft using a wire, a coil body wound around the outer periphery of the core shaft, and a tip that fixes the tip of the core shaft and the tip of the coil body.

  For example, Patent Document 1 discloses a guide wire in which the tip of a core is wound around a turning portion formed at the tip of a coil, and in this state, the guide wires are fixed by a plug formed of solder or the like. It is disclosed.

  Patent Document 2 discloses a medical device that removes deposits in blood vessels. Specifically, the medical device has a shaft, and the tip of the shaft is in the form of a spiral coil.

US Pat. No. 6,716,183 US Pat. No. 5,195,954

  However, the guide wire disclosed in Patent Document 1 has a core that is bent at the tip of the guide wire, although the tip of the core is wound around the tip of the coil body, so that it is difficult for them to be separated from each other. Due to the structure, the stress concentrates on this bent part, the core breaks at this part, the coil body comes off from the tip of the guide wire, and the safety is inferior. Have.

  Moreover, although the description about the core shaft which made the front-end | tip part the helical coil form is recognized for the medical device currently disclosed by patent document 2, about the structure where a coil body becomes difficult to drop from a core shaft, for example It is not disclosed at all.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a guide wire that prevents the coil body from slipping out from the distal end portion of the core shaft of the guide wire, and thus can improve safety.

<1> The invention according to claim 1 includes a core shaft and a coil body that covers at least a part of the core shaft, and the core shaft is formed in a spiral shape at a tip portion thereof. The coil part has a portion on the tip side of the coil body, the coil outer diameter of which is larger than the coil inner diameter of the coil body, The spiral direction of the coil part is the same .

  <2> The invention according to claim 2 of the present application is the guide wire according to claim 1, wherein the core shaft forming the base end portion of the coil portion and the tip end portion of the coil body are formed. It features a guide wire in which coil strands are alternately arranged to form a bite form.

  <3> The invention according to claim 3 of the present application is the guidewire according to claim 1 or 2, wherein the coil outer diameter of the coil body and the coil outer diameter of the coil portion are the same. It is characterized by.

<1> The guide wire according to claim 1 includes a core shaft and a coil body that covers at least a part of the core shaft, and the core shaft is formed in a spiral shape at a tip portion thereof. The coil part has a portion whose coil outer diameter is larger than the coil inner diameter of the coil body on the distal end side of the coil body, and the spiral direction of the coil body And the spiral direction of the coil portion are the same, and therefore, it is possible to provide a guide wire that can prevent the coil body from being detached from the distal end portion of the guide wire and thus improve the safety of the guide wire. it can.

  <2> The guide wire according to claim 2 is the guide wire according to claim 1, wherein the core shaft forming the base end portion of the coil portion and the tip end portion of the coil body are formed. Since the coil wires are alternately arranged and have a biting configuration, it is possible to reliably prevent the coil body from being detached from the guide wire.

  <3> The guidewire according to claim 3 is the guidewire according to claim 1 or 2, wherein the coil outer diameter of the coil body and the coil outer diameter of the coil portion are the same. Further, it is possible to further prevent the coil body from being detached from the guide wire and to improve the insertion property of the guide wire into the lesioned part.

It is a fragmentary sectional schematic diagram which shows the outline | summary of the guide wire concerning Example 1. FIG. It is a fragmentary sectional schematic diagram which shows the outline | summary of the guide wire concerning Example 2. FIG. It is a fragmentary sectional schematic diagram which shows the outline | summary of the guide wire concerning Example 3. FIG. It is a partial cross-sectional schematic diagram which shows the outline | summary of the guide wire concerning Example 4, (A) shows what has a biting form, (B) has the adhering part which fixes the part of a biting form Is shown. FIG. 10 is a partial cross-sectional schematic diagram showing an outline of a guide wire according to a modification of Example 4; FIG. 10 is a partial cross-sectional schematic diagram showing an outline of a guide wire according to another modification of Example 4; FIG. 12 is a partial cross-sectional schematic diagram showing an outline of a guide wire according to still another modification example of Example 4. FIG. 10 is a partial cross-sectional schematic diagram showing an outline of a guide wire according to Example 5; It is a fragmentary sectional schematic diagram which shows the outline | summary of the guide wire concerning Example 6. 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 to 9, the left side is the distal end side (distal side) inserted into the body, and the right side is the rear end side (proximal side, proximal end side) operated by an operator such as a doctor. is there.

[Example 1]
A guide wire 1A according to the first embodiment will be described with reference to FIG. 1 A of said guide wires were wound so that the core shaft 10A comprised with the taper-shaped metal material by which the front end side was small diameter and the base end side was large diameter may cover the outer periphery of the front-end | tip part of the said core shaft 10A. A coil body 20A made of a metal material.

  The guide wire 1A is provided with a tip 30A composed of a fixing member such as solder or adhesive fixed to the tip of the core shaft 10A.

  Furthermore, the core shaft 10A has a taper portion 11A at a position away from the distal end of the core shaft 10A in the proximal direction and at a position closer to the proximal end than the coil body 20A. A closely wound coil portion 12A formed in a spiral shape from the distal end side to the proximal end side is provided at the distal end portion of the shaft 10A and at a position closer to the distal end side than the coil body 20A. That is, the end 15A of the wire constituting the core shaft 10A is located away from the most distal end of the core shaft 10A toward the base end.

  In the core shaft 10A, first, the wire constituting the core shaft 10A is inserted into the coil body 20A, and then the distal end portion of the wire is formed into a spiral shape from the distal end side to the proximal end side, and The tip 30A is formed and manufactured.

  Here, the coil outer diameter d1 of the coil portion 12A is set to be larger than the coil inner diameter d2 of the coil body 20A (d1> d2). Further, the maximum outer diameter d3 of the tapered portion 11A is set to be larger than the coil inner diameter d2 of the coil body 20A (d3> d2). That is, the guide wire 1A of the present embodiment prevents the coil body 20A from being separated from the distal end side of the core shaft 10A because the coil body 20A is sandwiched between the coil portion 12A and the tapered portion 11A. Yes. Of course, the guide wire 1A of the present embodiment also prevents the coil body 20A from moving to the proximal end side with respect to the tapered portion 11A of the core shaft 10A.

  Therefore, the guide wire 1A includes a core shaft 10A and a coil body 20A that covers at least a part of the core shaft 10A, and the core shaft 10A is formed in a spiral shape at the tip thereof. The coil portion 12A is located on the tip side of the coil body 20A, and the coil outer diameter d1 of the coil portion 12A is larger than the coil inner diameter d2 of the coil body 20A. Therefore, the coil body 20A is prevented from being detached from the distal end portion of the guide wire 1A, and there is no place where stress is concentrated on the distal end portion of the guide wire 1A. Safety is improved by preventing damage.

  The material constituting the core shaft 10A of the present embodiment is, for example, a stainless steel alloy (SUS302, SUS304, SUS316, etc.), a superelastic alloy such as a Ni-Ti alloy, a piano wire, a nickel-chromium alloy, a cobalt alloy, or It is tungsten or the like, and other known materials may be used.

  The material constituting the coil body 20A of the present embodiment is, for example, a stainless steel alloy (SUS302, SUS304, SUS316, etc.), a superelastic alloy such as a Ni—Ti alloy, a piano wire, a nickel-chromium alloy, or a cobalt alloy. Radiopaque alloys such as gold, platinum, tungsten, or alloys containing these elements (for example, platinum-nickel alloys), and other known materials may be used.

  The material constituting the tip chip 30A of this embodiment is, for example, an adhesive such as an epoxy adhesive, or a metal solder such as silver solder, gold solder, zinc, Sn—Ag alloy, or Au—Sn alloy. From the viewpoint of fixing strength and mechanical strength, metal solder is preferable. The tip 30A may be formed by melting a portion of the core shaft 10A that constitutes the leading edge of the guide wire 1A.

[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 description.

  The guide wire 1B is configured such that the end portion 15B of the coil portion 12B of the core shaft 10B and the end portion 25B of the coil body 20B are slightly separated from each other, and the coil portion 12B and the coil body 20B are Has a fixed form.

  Here, since the coil body 20B is fixed to the core shaft 10B via the distal tip 30B, the guide body 1B reliably prevents the coil body 20B from being detached from the distal end portion of the guide wire 1B. To improve safety.

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 description.

  The guide wire 1C is fixed by a tip 30C in a state where the end 15C of the coil portion 12C of the core shaft 10C and the tip 25C of the coil body 20C are in contact with each other.

Since the guide wire 1C is fixed to the core shaft 10C via the tip 30C in a state where the tip portion 25C of the coil body 20C is in contact with the end portion 15C of the coil portion 12C, the coil body 20C is The safety of the guide wire 1C is improved by reliably preventing the guide wire 1C from being detached.

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 description.

  As shown in FIG. 4A, in the guide wire 1D, the core shaft 10D has a tapered portion 11D, and the distal end portion of the core shaft 10D is formed in a spiral shape from the distal end side toward the proximal end side. It has a coil portion 12D. Further, the coil portion 12D is in a loosely wound form having a predetermined interval.

  In addition, the guide wire 1D includes a coil body 20D wound so as to cover the outer periphery of the distal end portion of the core shaft 10D, and the distal end portion 25D of the coil body 20D is a wire material constituting the coil portion 12D. It has a sparsely wound portion 22D having an interval that can be positioned between them. The coil portion 12D has a loosely wound form as described above, and the strands of the coil body 20D can be positioned between the loosely wound forms.

  And the coil part 12D of the said core shaft 10D and the loosely-winding part 22D of the said coil body 20D are made into the meshing form which mutually meshed, and is mutually arrange | positioned.

  The guide wire 1D is provided with a tip 30D at the tip. Since the guide wire 1D has such a biting structure, the coil body 20D is largely prevented from being detached from the distal end portion of the guide wire 1D, and the core shaft 10D and the coil body 20D are prevented. Even when they are made of different metals that cannot be fixed to each other by soldering, the coil portion 12D and the coil body 20D can be preferably fixed.

  In the above configuration, the coil portion 12D and the loosely wound portion 22D of the coil body 20D may be fixed by the tip chip 30D. Further, as described in FIG. 4B, the guide wire 1D is fixed by a fixing portion 31D made of a fixing member, with the portion of the biting form biting each other in a state of being separated from the distal tip 30D toward the proximal end side. , Can fix each other. Since the guide wire 1D has such a configuration, the coil portion 12D of the core shaft 10D and the coil body 20D can be more firmly fixed, so that the coil body 20D is detached from the distal end portion of the guide wire 10D. This can be surely prevented.

  Here, as a modification, a guide wire 1E as illustrated in FIG. 5 is illustrated.

  More specifically, in the guide wire 1E, the strands of the coil portion 12E and the strands of the coil body 20E are alternately arranged so as to be engaged, and the coil outer diameter d4 of the coil portion 12E The coil outer diameter d5 of the coil body 20E is the same size. Further, the maximum outer diameter d6 of the tapered portion 11E of the core shaft 10E is set to be larger than the inner diameter d2 of the coil body 20E (d6> d2).

  For this reason, the guide wire 1E can more reliably prevent the coil body 20E from being detached from the guide wire 1E, and the outer diameter is equal from the tip tip 30E to the coil body 20E. Since the outer periphery and the outer periphery of the coil body 20E are smoothly connected, the insertion property of the guide wire 1E into the lesioned part can be improved.

  As a further modification, a guide wire 1F as shown in FIG. 6 is exemplified.

  That is, in the guide wire 1F, the coil body 20F is positioned between the coil part 12F and the taper part 11F, and the coil part 12F of the core shaft 10F and the tip part 25F of the coil body 20F are slightly separated. In this state, it is fixed by the tip 30F. Further, the coil outer diameter d4 of the coil portion 12F of the core shaft 10F is set to a dimension equal to the coil outer diameter d5 of the coil body 20F.

  Thus, since the guide wire 1F has such a configuration, the coil body 20F can be reliably prevented from being detached from the distal end portion of the guide wire 1F, and the outer periphery of the coil portion 12F and the coil Since the outer periphery of the body 20F is smoothly connected, the insertion property of the guide wire 1F into the lesioned part can be improved.

  As a further modification, a guide wire 1G as shown in FIG. 7 is illustrated.

  That is, in the guide wire 1G, the coil body 20G is positioned between the coil part 12G and the taper part 11G, and the coil part 12G of the core shaft 10G and the tip part 25G of the coil body 20G are in contact with each other. It is fixed by the tip 30G. In addition, the coil outer diameter d4 of the coil portion 12G of the core shaft 10G is set to be equal to the coil outer diameter d5 of the coil body 20G.

  For this reason, the guide wire 1G can more reliably prevent the coil body 20G from being detached from the guide wire 1G, and can improve the insertion property of the guide wire 1G into the lesioned part.

Example 5
A guide wire 1H 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 attaches | subjects the same code | symbol, and abbreviate | omits description.

  The guide wire 1H has a tapered shape in which the coil body 20H is located between the coil portion 12H and the tapered portion 11H, and the outer diameter of the coil portion 12H of the core shaft 10H is reduced toward the proximal end. Yes. The minimum coil outer diameter d7 at the proximal end of the coil portion 12H is set to be smaller than the inner diameter d2 of the coil body 20H (d7 <d2), and in addition, a portion of the proximal end side of the coil portion 12H is partially The coil body 20H is fixed to the tip part 30H in a state of being inserted into the tip part 25H, and the outer peripheral surface of the tip part 30H and the outer peripheral surface of the coil body 30H are smoothly connected.

  Since the guide wire 1H has such a configuration as described above, the outer peripheral portion of the coil portion 12H is in contact with the inner peripheral portion of the tip portion 25H of the coil body 20H. Detachment from the distal end of the guide wire can be more reliably prevented, and the insertion property of the guide wire 1H into the lesioned portion can be improved.

  In FIG. 8, the outer peripheral portion of the coil portion 12H is in partial contact with the inner peripheral portion of the tip portion 25H of the coil body 20H, but the outer peripheral portion of the coil portion 12H is not limited to this. You may lengthen the part which the inner peripheral surface of the coil body 20H contacts. Since the guide wire 1H has such a configuration, the coil body 20H can be more reliably prevented from being detached from the distal end portion of the guide wire 1H.

Example 6
A guide wire 1J of Example 6 will be described with reference to FIG. In addition, what has the structure similar to the said Examples 1-5 attaches | subjects the same code | symbol, and abbreviate | omits description.

  The guide wire 1J has a coil portion 12J formed in a spiral shape from the proximal end toward the distal end side at the distal end portion of the core shaft 10J. The coil body 20J is disposed between the tapered portion 11J and the coil portion 12J of the core shaft 10J. The guide wire 1J is provided with a tip 30J at the tip.

  In addition, the coil outer diameter d8 of the coil portion 12J is set to be larger than the coil inner diameter d2 of the coil body 20J (d8> d2). Further, the maximum outer diameter d9 of the tapered portion 11J is set to be larger than the coil inner diameter d2 of the coil body 20J (d9> d2).

  Therefore, the guide wire 1J includes a core shaft 10J and a coil body 20J that covers at least a part of the core shaft 10J, and the core shaft 10J is formed in a spiral shape at the tip thereof. The coil portion 12J is located on the tip side of the coil body 20J, and the coil outer diameter d8 of the coil portion 12J is larger than the coil inner diameter d2 of the coil body 20J. Since it has a large portion, the coil body 20J is prevented from being detached from the distal end portion of the guide wire 1J, and there is no portion where stress is concentrated on the distal end portion of the guide wire 1J. The safety is improved by suppressing breakage of the tip of 1J.

  In addition, the form of the coil part of the guide wire as described in the said Example 2-Example 5 may be the same form as the said coil part 12J.

  In addition, even if it exists in the said Example 2-Example 5, it is good also as what has the structure similar to the said coil part 12J.

  It is not limited to the said Example, For example, the dimension shape of each part can be freely selected suitably.

  Further, the wire diameters and cross-sectional shapes of the core shafts 10A to 10J, the coil portions 12A to 12J, and the coil bodies 20A to 20J are not particularly limited. For example, the cross-sectional shape may be a polygonal cross section.

  Moreover, although the said coil bodies 20A-20J are described in the Example as a single coil, it is not limited to this, A multi-strand coil body is good, A coil strand is formed from several metal strands. A coil body formed from twisted wires may also be used.

  The outer diameters of the coil portions 12A to 12J are equal to or less than the coil outer diameter of the coil bodies 20A to 20J, but if the coil outer diameter of the coil bodies 20A to 20J is smaller than the coil inner diameter of the coil portions 12A to 12J, the coil The outer diameters of the portions 12A to 12J can be greater than or equal to the coil outer diameter of the coil bodies 20A to 20J. However, considering the insertion property to the lesioned part, it is preferable that the outer diameter of the coil parts 12A to 12J be equal to or smaller than the outer diameter of the coil bodies 20A to 20J.

1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1J Guide wires 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10J Core shafts 12A, 12B, 12C, 12D, 12E, 12F, 12G, 12H, 12J Coil parts 20A, 20B, 20C, 20D, 20E, 20F, 20G, 20H, 20J Coil body

Claims (3)

A core shaft;
A coil body covering at least a part of the core shaft,
The core shaft has a coil portion formed by spirally forming the core shaft at a tip portion thereof,
The coil part has a portion on the tip side of the coil body, the coil outer diameter of which is larger than the coil inner diameter of the coil body ,
The guide wire , wherein the spiral direction of the coil body and the spiral direction of the coil part are the same . The guidewire according to claim 1, wherein
The core shaft that forms the base end portion of the coil portion and the coil strands that form the distal end portion of the coil body are alternately arranged to form a biting form. To guide wire. The guide wire according to claim 1 or 2,
The guide wire according to claim 1, wherein a coil outer diameter of the coil body and a coil outer diameter of the coil portion are the same.

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