JP2012070906A - Guide wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide wire wherein blood vessel selectivity is enhanced by stabilizing shaping of a guide wire distal end part, and wherein safety is improved by making the distal end part of the guide wire flexible.SOLUTION: This guide wire 1 includes a core shaft 2, and a coil body 5 wound around at least a distal end part of the core shaft 2. The core shaft 2 has a flat section part 3 whose cross section is flat inside the coil body 5. The flat section part 3 is formed with a helical shape part 4 formed in a helical state, and is formed such that a pitch of the helical shape part 4 expands to the distal end direction.

Description

  The present invention relates to a guide wire.

  Conventionally, various guide wires have been proposed which are used to guide a medical device or the like to a target site by being inserted into a tubular organ such as a blood vessel, a digestive tract, or a ureter or a body tissue.

  For example, the guide wire described in Patent Document 1 is a core wire in which the tip portion of the core wire is formed of a flat portion, and a part of the flat portion is helically twisted so that the helical pitch decreases toward the tip direction. Since the core wire is formed in a spiral shape, the tip of the guide wire is prevented from being broken and the operability is improved.

  Further, although not a guide wire, the medical device described in Patent Document 2 has a rigid member formed in a spiral shape, and maximizes the helical pitch of the base end portion of the rigid member to make it flexible. The helical pitch at the front end portion is minimized to improve the rigidity and used as a rigid member of a medical device.

US Pat. No. 5,299,580 US Pat. No. 6,059,771

  However, in the guide wire described in Patent Document 1, since a part of the flat part of the core wire is formed in a spiral shape, the guide wire bends the distal end part of the guide wire during the operation although the guide wire is prevented from being broken. When forming into a shape, since the helical pitch is reduced, the bent shape is formed in a spiral shape, resulting in a problem that the blood vessel selectivity deteriorates.

  Moreover, even if the spiral form described in Patent Document 2 is used as the spiral form of such a guide wire, there is a possibility that the inside of a blood vessel or the like is damaged because the rigidity of the distal end part is higher than the proximal part. It was.

  The present invention has been made in view of such problems, and stabilizes the shaping of the guide wire tip to improve blood vessel selectivity, and also makes the tip of the guide wire flexible to improve safety. An object is to provide a guide wire.

  <1> The invention according to claim 1 includes a core shaft and a coil body that winds at least a tip portion of the core shaft, and the core shaft includes a flat cross-sectional portion having a flat cross section as the coil. A guide wire is provided in the body, wherein the flat cross-sectional portion has a helical shape portion formed in a helical shape, and the pitch of the helical shape portion is formed so as to expand toward the distal end direction. And

  <2> The invention according to claim 2 is characterized in that, in the guide wire according to claim 1, the helical shape portion is formed over the entire length of the flat cross section.

  <3> The invention according to claim 3 is the guide wire according to claim 1 or claim 2, wherein the coil body is a loosely wound portion formed by loosely winding the helically wound portion. The guide wire is characterized in that it has a portion, and the pitch of the loosely wound portion is formed so as to expand toward the distal direction.

  <4> The invention according to claim 4 is the guide wire according to claim 3, wherein the coil body has a densely wound portion on a proximal end side of the loosely wound portion, and a distal end of the densely wound portion is The guide wire is fixed to the core shaft.

  <5> The invention according to claim 5 is the guide wire according to any one of claims 1 to 4, wherein the flat cross-sectional portion has a thickness of the flat cross-sectional portion in a distal direction. It features a guide wire that has a shape that decreases and increases the width of the flat cross section.

  <6> The invention according to claim 6 is the guide wire according to any one of claims 1 to 5, wherein a spiral pattern is formed at a base end portion of the core shaft. The guide wire is characterized in that a visual recognition part is provided, and the direction of the spiral pattern is the same as the winding direction of the helical shape.

  <7> The invention according to claim 7 is the guide wire according to any one of claims 1 to 6, wherein the coil body is formed of a multi-coil body.

  <1> Since the helical pitch of the guide wire according to the first aspect of the present invention is expanding toward the distal end direction, the flexibility of the distal end portion of the guide wire is ensured and the safety is improved. When a bent shape is imparted to the distal end portion of the wire, the bent shape is difficult to be formed in a spiral shape, so that the blood vessel selectivity of the guide wire is improved.

  <2> In the guide wire according to claim 2, since the helical shape portion is formed over the entire length of the flat cross section, in addition to the effect of the guide wire according to claim 1, it depends on the flat cross section. In addition to reliably preventing honey, the blood vessel selectivity of the guide wire is further improved, and damage to the blood vessel wall due to the honey is prevented and safety is further improved.

  <3> In the guide wire according to claim 3, since the coil body that covers the helical shape portion of the core shaft is formed with a loosely wound portion whose pitch increases toward the distal end direction, the guide wire according to claim 1 or 2 In addition to the effects described above, the flexibility of the guide wire tip is further improved to further improve the safety of the guide wire, and the sparsely wound portion is formed, so that the bent shape of the guide wire tip is further formed. This facilitates the effect of further improving the blood vessel selectivity of the guide wire.

  <4> The guide wire according to claim 4 has a densely wound portion formed on the proximal end side of the loosely wound portion of the coil body, and the distal end of the densely wound portion is fixed to the core shaft. In addition to the effects described in (1), by improving the rotation transmission performance of the guide wire, the operability of the guide wire is further improved, and as a result, the blood vessel selectivity of the guide wire is greatly improved.

  <5> Since the guide wire according to claim 5 has a shape in which the thickness of the flat cross section decreases and the width of the flat cross section increases as the flat cross section proceeds in the distal direction. The helical section provided in the flat cross section is easier to bend in the thickness direction, improves the flexibility of the tip of the guide wire, and is shaped to be bent to the tip of the guide wire. There is an effect of further improving.

  <6> In the guide wire according to claim 6, a winding direction visual recognition part in which a spiral pattern is formed is formed at the proximal end portion of the core shaft of the guide wire, and the direction of the spiral pattern is Since the spiral direction of the helical shape portion is the same as the winding direction of the helical shape portion, when the surgeon rotates the guide wire in the direction along the spiral pattern, the helical shape of the helical shape portion is about to be released and the helical shape is At the same time as the coil body is stretched, it extends in the major axis direction so that the outer diameter of the coil body decreases. At this point, when the guide wire is pulled toward the proximal end, the guide wire that has been occluded in the occluded lesion is pulled out. Therefore, the safety of the guide wire is greatly improved.

  <7> Since the guide wire according to the seventh aspect has a coil body formed of a multi-strand coil body, the operability of the guide wire is improved, and thus the blood vessel selectivity of the guide wire is improved. Play.

1 is an overall view of a guide wire showing a first embodiment of the present invention. It is a general view of the guide wire which shows 2nd Embodiment of this invention. It is a general view of the guide wire which shows 3rd Embodiment of this invention. It is a general view of the guide wire which shows 4th Embodiment of this invention. It is a general view of the guide wire which shows 5th Embodiment of this invention. It is a general view of the guide wire which shows 6th Embodiment of this invention.

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

<First Embodiment>
FIG. 1A is an overall view showing a guide wire according to a first embodiment of the present invention.

In FIG. 1A, for convenience of explanation, the left side is described as “base end” and the right side is described as “tip”.
Further, in FIG. 1A, in order to facilitate understanding, the length direction of the guide wire 1 is shortened and schematically illustrated as a whole, and thus the overall dimensions are different from actual ones.

  In FIG. 1A, a guide wire 1 is composed of a core shaft 2 and a coil body 5 that covers the tip of the core shaft 2, and the tip of the core shaft 2 and the tip of the coil 5 are mutually connected. The distal end portion 6 is fixed, and the proximal end portion of the coil body 5 is secured to the core shaft 2 by brazing 9 in the proximal end direction from the distal end portion 6.

  As shown in FIG. 1B to FIG. 1E, the core shaft 2 has a flat cross section in which the outer diameter decreases toward the distal end and the cross section is flat, as described in FIG. A helical shape portion 4 formed in a helical shape is formed in a part of the flat cross section 3.

  Here, each cross section of the core shaft 2 will be described in detail. FIGS. 1B to 1E illustrate cross sections of the core shaft 2 in the coil body 5 taken along section lines AA to DD. The cross section of the cross section line AA of the core shaft 2 is circular, and the cross sections of the cross section lines BB to DD are flat.

  Moreover, the helical shape part 4 has the helical pitch space | interval P which becomes large as it goes to the front-end | tip direction of a guide wire.

  Thus, since the guide wire 1 has the flat cross-section part 3, while ensuring the softness | flexibility by the flat cross-section part 3 and improving the safety | security of the guide wire 1, further, the front-end | tip of the flat cross-section part 3 Since the helical portion 4 has a helical shape portion 4 in which the helical pitch interval P increases in the distal direction, it is difficult to form the bent shape in a spiral shape when the distal end portion of the guide wire 1 is given a bent shape. The blood vessel selectivity of the guide wire can be improved.

  Moreover, although the cross-sectional area of the helical shape part 4 provided in the front end side of the flat cross-section part 3 and the flat cross-section part 3 may be decreased toward the front-end | tip direction of the guide wire 1, FIG. As in the present embodiment described in e), it is preferable that the cross-sectional areas of the flat cross section 3 and the cross section of the helical shape 4 be constant. Thereby, the adhering strength between the core shaft 2 and the most distal portion 6 can be ensured.

  The helical shape part 4 can be produced by the method described below. First, the flat cross section 3 is formed in the front-end | tip part of the core shaft 2 with a press. Thereafter, one end is fixed, and from the other end, a rotation device is provided for applying a rotational motion to the outer periphery of the guide wire 1 around the center of the long axis of the guide wire 1. After fixing to one end of the device and fixing the base end of the flat cross-sectional portion 3 to the other end of the rotating device, the flat cross-sectional portion 3 becomes the base by applying rotational motion to the flat cross-sectional portion 3 from the other end of the rotating device. Twisted from the end side. Thereby, the helical shape part 4 in which the helical pitch interval P increases as it goes in the distal direction is formed.

  Moreover, the helical shape part 4 can obtain the stable shape by relieving the stress applied by the twist by heat treatment after applying the twist by the rotating device. In addition, the formation method of the helical-shaped part 4 is not limited to the above-mentioned method, You may produce by employ | adopting other well-known methods suitably.

Moreover, in FIG. 1A, the winding direction of the helical shape portion 4 is a direction in which the thickness portion 4A of the helical shape portion 4 is twisted upward from the proximal end toward the distal end. . (Hereafter, this direction is defined as the S direction.)
However, without being limited to this, the winding direction of the helical shape portion 4 may be a direction in which the thickness portion 4A of the helical shape portion is twisted to the right shoulder downward from the proximal end side toward the distal end direction. it can. (Hereafter, this direction is defined as the Z direction.)

  In the guide wire 1 of the present embodiment, the proximal end of the coil body 5 is inserted into the distal end of the core shaft 2 having the helical shape 4, and then the core shaft 2 and the coil body 5 are connected to the most distal portion 6 and the brazing 9 portion. It is manufactured by fixing with.

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

  The material of the most advanced portion 6 and the material of the brazing 9 for fixing the core shaft 2 and the coil body 5 are not particularly limited. For example, aluminum alloy brazing, silver brazing, gold brazing, zinc, Sn -Pb alloy, Pb-Ag alloy, Sn-Ag alloy, etc. can be used.

  Further, when the core shaft 2 and the coil body 5 are fixed using these materials, a flux is preliminarily applied to each position of the core shaft 2 and the coil body 5 where the most advanced portion 6 and the brazing 9 are provided. It is preferable to apply it. Thereby, the wettability with the brazing material used by the core shaft 2 and the coil body 5, and the most advanced part 6 and the brazing 9 becomes favorable, and fixing strength increases.

Moreover, as a material which forms the coil body 5, a radiopaque strand or a radiolucent strand can be used.
The material of the radiopaque element wire is not particularly limited. For example, gold, platinum, tungsten, or an alloy containing these elements (for example, platinum-nickel alloy) may be used. it can.
Further, the material of the radiation transmissive element wire is not particularly limited, but, for example, a stainless steel (SUS304, SUS316, etc.), a superelastic alloy such as a Ni-Ti alloy, a piano wire, or the like is used. Can do.

  In addition, the proximal end portion of the coil body 5 is formed of a radiation transparent material strand, and the distal end side of the coil body 5 is formed of a radiation opaque material strand. Impermeability can be imparted. By doing in this way, the position of the front end side of the coil body 5 can be confirmed under a radiographic image, and blood vessel selectivity can be improved.

  Although not shown in FIG. 1 (a), a slipperiness improver is coated on the outer periphery of the guidewire 1 in order to improve the slipperiness between the guidewire 1 and the catheter and human tissue. Also good. In addition, the formation part of a lubricity improvement agent may be the whole outer periphery of the guide wire 1, and may be formed in a part of longitudinal direction of the guide wire 1. FIG.

  The material for the slipperiness improver is not particularly limited, but is a hydrophobic slippery improver such as silicone oil or fluororesin, or polyvinylpyrrolidone, polyvinyl alcohol, maleic anhydride copolymer, hyaluron. A hydrophilic slipping improver such as an acid can be used, whereby the operability of the guide wire 1 is improved, and as a result, blood vessel selectivity can be improved.

<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.

A flat cross-sectional portion provided at the tip of the core shaft 2 of the guide wire 11 is twisted over its entire length to form a helical shape portion 14.
This helical shape part 14 can be produced by the method of producing the helical shape part 4 in the first embodiment. Specifically, the helical shape portion 14 fixes the base end side of the flat cross section 3 formed in advance, that is, the portion 2A of the core shaft 2 at the other end of the rotating device, and fixes the other end. By rotating it, it is obtained by twisting the entire length of the flat cross section. In addition, the formation method of the helical-shaped part 14 is not limited to the method described above, You may produce other well-known methods suitably.

  Since the guide wire 11 having such a helical shape portion 14 is formed over the entire length of the flat cross section, the guide wire 11 has a flexible shape while ensuring the flexibility of the guide wire 11 and the stability of the bent shape. Can be reliably prevented, blood vessel selectivity can be further improved, and damage to the blood vessel wall due to honey can be prevented to further improve safety.

<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.

  The coil body wound around the distal end portion of the guide wire 21 covers a part of the core shaft 2 and the flat cross-sectional portion 3, and forms a proximal end portion of the coil body. The coil body 25 is formed of a loosely wound portion that covers the shape portion 4 and forms the tip portion of the coil body.

  Note that the pitch of the loosely wound portions of the coil body 25 composed of the loosely wound portions has a structure that expands toward the tip report of the guide wire 21. Thus, the guide wire 21 further increases the flexibility of the distal end portion of the guide wire, further improves the safety of the guide wire, and makes it easier to form a bent shape of the distal end portion of the guide wire. The selectivity can be further improved.

  Further, the coil body 15 composed of the densely wound portion and the coil body 25 composed of the loosely wound portion may be formed integrally or separately. As a method of forming the coil body 25 composed of the loosely wound portions, the coil body 25 composed of the loosely wound portions is manufactured so that the pitch is expanded in one direction by using a coil manufacturing machine or a coil manufacturing apparatus using a cored bar method. And a method of forming a coil body 25 composed of sparsely wound portions by forming a gap between coil wires using a pitch widening device after the densely wound coil body is produced, and gradually widening the pitch. There is. Moreover, it is not limited to the method described here, You may produce other well-known methods suitably.

In addition, when the proximal end of the coil body 25 composed of the loosely wound portion is disposed in the proximal end direction with respect to the distal end of the flat cross-sectional portion 3 not forming the helical shape portion 4, the coil body 25 composed of the loosely wound portion. Will cover the flat cross-sectional portion 3, and the rotation transmission property of the guide wire 21 is deteriorated. As a result, the blood vessel selectivity may be lowered. For this reason, it is preferable that the proximal end of the coil body 25 formed of the loosely wound portion is disposed at least in the distal direction from the proximal end of the helical shape portion 4.
Further, in order to maximize the flexibility of the guide wire 21 and the ease of imparting the bent shape of the distal end of the guide wire 21, as shown in FIG. Most preferably, the proximal end of the body 25 is disposed at the proximal end of the helical shaped portion 4. Thereby, as mentioned above, the flexibility of the guide wire 21 and the ease of imparting a bent shape to the tip of the guide wire 21 can be greatly improved.

  Moreover, in order to improve the softness | flexibility, the coil body 25 which consists of a loosely wound part can also use the coil body from which the strand diameter of a coil reduces as it goes to a front-end | tip. By using such a coil body, the flexibility of the coil body 25 composed of the loosely wound portion is further increased, and the bending shape at the tip of the guide wire 21 is further easily provided.

<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 first embodiment. Portions common to the first 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.

  The guide wire 31 has a coil body 15 composed of a densely wound portion and a coil body 25 composed of a loosely wound portion, and further, a coil composed of a densely wound portion at the tip position of the coil body 15 composed of a closely wound portion. The fixing member 7 that fixes the body 15 and the core shaft 2 is provided.

The material of the fixing member 7 is not particularly limited, and a synthetic resin, the same brazing material as the most advanced portion 6 and the brazing 9 can be used.
When the same brazing material as the most advanced portion 6 and the brazing 9 is used, as described above, the tip of the coil body 15 including the core shaft 2 and the closely wound portion located at the place where the fixing member 7 is provided. It is preferable to apply a flux in advance.

  The synthetic resin used for the fixing member 7 is not particularly limited, but an adhesive such as polyethylene, polypropylene, polyamide, various elastomer materials, or epoxy resin can be employed.

  Since the guide wire 31 can transmit the torque of the coil body 15 composed of the closely wound portion to the core shaft 2 by fixing the tip of the coil body 15 composed of the closely wound portion to the core shaft 2 in this way, By improving the rotation transmission performance of the wire 31, the operability of the guide wire is further improved, and as a result, the blood vessel selectivity of the guide wire can be greatly improved.

  Note that the position of the tip end of the coil body 15 formed of the closely wound portion can be provided in the helical shape portion 14, but in consideration of ensuring the flexibility of the guide wire, the position shown in FIG. 2 and the helical shape portion 14 are preferably provided at the boundary. Thereby, the guide wire 31 can improve rotation transmission property, ensuring a softness | flexibility.

  Moreover, you may employ | adopt about the guide wire 21 of 3rd Embodiment about the adhering of the coil body 15 and the core shaft 2 which consist of the closely wound part employ | adopted by this embodiment.

  In this case, the fixing position between the coil body 15 formed of the closely wound portion and the core shaft 2 can be provided at an intermediate portion of the helical shape portion 4 or the like, but is provided at the boundary between the flat cross-sectional portion 3 and the helical shape portion 4. It is preferable. As a result, the torque of the coil body 15 composed of the tightly wound portion can be directly transmitted to the helical shape 4, so that the rotation transmission performance and flexibility of the guide wire 21 are improved, thereby improving the safety of the guide wire 21. In addition, since the bent shape of the guide wire 21 at the tip can be easily formed, the blood vessel selectivity of the guide wire 21 can be further improved.

<Fifth Embodiment>
Next, the guide wire 41 according to the fifth embodiment will be described with reference to FIG. 5A 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. 5A, the length direction of the guide wire 41 is shortened and the entire guide wire 41 is schematically shown for easy understanding, and therefore the overall dimensions are different from the actual dimensions. .

  As shown in FIGS. 5B to 5E, the core shaft 2 of the guide wire 41 has a flat cross section in the coil body 5, and the thickness of the flat cross section is the tip direction. A flat cross-sectional portion 13 that decreases toward the flat surface portion and a helical-shaped portion 24 provided on the flat cross-sectional portion 13.

  Here, each cross section of the core shaft 2 will be described in detail. FIGS. 5B to 5E illustrate cross sections of the core shaft 2 in the coil body 5 taken along section lines AA to DD. The cross section of the cross section line AA of the core shaft 2 is circular, and the cross sections of the cross section lines BB to DD are flat. Further, when comparing the cross section taken along the cross section line BB and the cross section taken along the cross section line DD, the cross section of the flat cross section 13 is directed toward the distal end, and the thickness of the flat cross section 13 is larger. It has a shape that decreases and increases in width.

  The flat cross section 13 can be formed by a rolling mill such as a rolling roller so that the thickness of the flat cross section 13 decreases and the width increases in the distal direction. Moreover, you may form the flat cross-section part 13 by a well-known method, without being limited to this.

  The area of the cross section of the flat cross section 13 may be reduced toward the tip, but in the length direction of the flat cross section 13 as in the present embodiment described in FIGS. , Preferably the same. Thereby, the adhering strength between the core shaft 2 and the most distal portion 6 can be ensured.

  When the helical shape portion 24 is formed in the flat cross-section portion 13, as shown in FIGS. 5C to 5E, the helical shape portion 24 whose thickness decreases toward the tip and increases in width at the same time. It becomes.

  Thereby, the helical-shaped part 24 provided in this flat cross-sectional part 13 becomes easy to bend | bend with respect to the thickness direction, improves the softness | flexibility of the front-end | tip part of the guide wire 41, and the front-end | tip of the guide wire 41 The shape of the bent shape can be further improved.

  In addition, it is preferable that the maximum width of the helical-shaped part 24 does not contact the inner periphery of the coil body 5 when the guide wire 41 is held in a linear state. Thereby, the softness | flexibility of the front-end | tip part of the guide wire 41 is securable.

<Sixth Embodiment>
Next, the guide wire 51 according to the sixth embodiment will be described with reference to FIG. 6 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. 6, in order to facilitate understanding, the length direction of the guide wire 51 is shortened and the entire guide wire 51 is schematically illustrated, and thus the overall dimensions are different from the actual dimensions.

  The guide wire 51 is provided with a winding direction visual recognition portion 8 having a spiral pattern on the outer periphery of the proximal end portion of the core shaft 2 as a means for confirming the spiral direction of the helical shape portion 14. In FIG. 6, the spiral direction of the helical shape portion 14 is the S direction, and the spiral pattern of the winding direction visual recognition portion 8 formed on the outer periphery of the base end portion of the core shaft 2 is also formed in the S direction. Has been.

  When the guide wire 51 is inserted into an obstruction lesion such as a blood vessel, and the distal end portion of the coil body 25 composed of the most distal end portion 6 and the loosely wound portion of the guide wire 51 is captured in the obstruction lesion, the operator turns the winding direction. Rotate the guide wire 51 in a direction that does not follow the spiral pattern of the viewing portion 8 (when the guide wire 51 is viewed from the proximal end toward the distal end, the proximal end portion of the guide wire 51 is rotated clockwise. The helical shape portion 14 of the guide wire 51 takes a form in which the helical shape in the S direction further develops, that is, a form in which the helical shape portion 14 is tightened. It becomes difficult to rotate the guide wire 51.

  In addition, the surgeon rotates the guide wire 51 in a direction along the spiral pattern of the winding direction visual recognition unit 8 (when the guide wire 51 is viewed from the proximal end toward the distal end, the proximal end portion of the guide wire 51 When the helical shape portion 14 is stretched in the major axis direction, the helical shape portion 14 is stretched in the long axis direction so that the helical shape portion 14 is about to be released. The body 25 is extended in the long axis direction. The coil body 25 composed of the expanded sparsely wound portion expands while the outer diameter of the coil is reduced, so that it is easy to come out from the captured obstructed lesion. In this state, when the guide wire 51 is pulled toward the proximal end side, it is easy to pull out the guide wire 51 that has been blocked in the blocked lesion.

  As described above, when the guide wire 51 is captured in the diseased blood vessel, the operator confirms the winding direction of the helical shape portion 14 through the winding direction visualizing portion 8, thereby pulling out the rotation operation of the guide wire 51. Even when the guide wire 51 is captured, it can be safely pulled out and the safety of the guide wire 51 can be greatly improved.

  In addition, you may apply the winding direction visual recognition part 8 of this embodiment to the guide wire of other embodiment.

  The material constituting the winding direction visual recognition unit 8 is not particularly limited, and examples thereof include paint, resin containing pigment, or a coil spring fixed to the outer periphery of the core shaft 2. Further, when a lubricity improver such as PTFE is used for the core shaft 2, the PTFE is scraped off with a laser or the like, or a PTFE film having a color different from that of the PTFE coated in advance is formed. Can be provided.

  In addition, the winding direction visualizing portion 8 may be configured so that, for example, the direction in which the helical shape portion 14 is tightened is yellow, the direction in which the helical shape portion 14 is opened is red, and the direction in which the helical shape portion 14 is tightened and the direction in which the helical shape portion 14 is opened are indicated. good. The colors indicating the tightening direction and the releasing direction are yellow and red, respectively. However, the color used in the tightening direction and the releasing direction is not limited to this, and any color combination that can be identified is used. It ’s fine.

  Further, an arrow may be provided on the spiral pattern of the winding direction visual recognition unit 8 to clarify the direction along the spiral direction of the winding direction visual recognition unit 8.

  Moreover, you may form the winding direction visual recognition part 8 not in the outer periphery of the core shaft 2, but in the torquer etc. which are accessory parts for loading rotation operation to the guide wire 51. FIG.

  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, a shaping metal ribbon or the like may be provided in parallel with the helical shape portion 14 on the distal end side of the helical shape portion. Thereby, the bent shape of the tip of the guide wire can be formed more stably.

  In addition, the coil body may be a multi-strand coil body formed by twisting a plurality of strands instead of a single-strand coil body. By using a multi-strand coil body, the operability of the guide wire is improved, and as a result, the blood vessel selectivity of the guide wire can be improved.

  In addition, as a method of forming a gap between the strands when a multi-strand coil body is used, there is a method of increasing the degree of polishing toward the tip by using electrolytic polishing. Thereby, even if it is a multi-row coil body, a space | gap can be formed in the strand which forms a coil body, and the space | interval of the space | gap can be expanded toward a front-end | tip direction.

  Further, the coil body and the helical shape portion may be fixed by a fixing member or the like as long as the flexibility of the guide wire is not impaired.

DESCRIPTION OF SYMBOLS 1, 11, 21, 31, 41, 51 Guide wire 2 Core shaft 3, 13 Flat cross-section part 4, 14 Helical shape part 5 Coil body 15 Coil body which consists of a densely wound part 25 Coil body which consists of a loosely wound part 6 The most advanced Part 7 Fixing member 8 Winding direction visual recognition part 9 Brazing

Claims (7)

A core shaft;
A coil body that winds at least the tip of the core shaft;
The core shaft has a flat cross section having a flat cross section in the coil body,
The flat cross-sectional portion has a helical shape portion formed in a helical shape,
The guide wire is formed so that the pitch of the helical shape portion is enlarged toward the distal end direction. The guidewire according to claim 1, wherein
The helical shape portion is a guide wire formed over the entire length of the flat cross section. The guide wire according to claim 1 or 2,
The coil body has a loosely wound portion in which a portion wound around the helical shape portion is formed by loosely winding,
A guide wire, wherein the pitch of the loosely wound portions is formed so as to expand toward the tip. The guide wire according to claim 3,
The coil body has a densely wound portion on a proximal end side of the loosely wound portion,
The guide wire is fixed to the core shaft at the tip of the tightly wound portion. In the guide wire according to any one of claims 1 to 4,
The guide wire having a shape in which the flat cross-sectional portion has a shape in which the thickness of the flat cross-sectional portion decreases and the width of the flat cross-sectional portion increases in the distal direction. The guide wire according to any one of claims 1 to 5,
The base end portion of the core shaft is provided with a winding direction visual recognition portion in which a spiral pattern is formed,
The guide wire in which the direction of the spiral pattern is the same as the winding direction of the helical shape. The guide wire according to any one of claims 1 to 6,
A guide wire in which the coil body is formed of a multi-strand coil body.