JP2013085854A - Guide wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly safe guide wire used for guiding a device such as a balloon or a stent to a lesion as one of medical instruments used in percutaneous transluminal coronary angioplasty.SOLUTION: The guide wire 1 includes a core shaft 10 having a distal end part 11 and a rear end part 12, and a first coil body 20 covering the outer circumference of the distal end part. The distal end part is formed including the most distal end part 13 positioned at the most distal end of the core shaft, a connection part 14 positioned on the rear end part side from the most distal end part and connected to the most distal end part, and a support part 15 positioned on the rear end part side from the connection part and connected to the connection part. When the distal end part is seen through from one plane side to the other plane side, the width of the most distal end part is wider than the width of the support part and the first coil body is in contact with the connection part. When the distal end part is seen through from one side face side orthogonal to the plane to the other side face side, the width of the most distal end part is narrower than the width of the support part, and the first coil body is in contact with the connection part.

Description

The present invention relates to a guide wire.

Conventionally, a guide wire used to guide a device such as a balloon or a stent to a lesion is known as one of medical instruments used in percutaneous coronary angioplasty (hereinafter also simply referred to as PTCA). ing.

As such a guide wire, for example, Patent Document 1 covers a core shaft having a rear end portion and a front end portion, and the front end portion of the core shaft is covered by inserting the front end portion of the core shaft into the lumen. A guide wire is disclosed that includes a coil and a fixing member that fixes the tip of the coil and the tip of the core shaft.

The distal end portion of the core shaft in such a conventional guide wire forms a cylindrical plug portion by enlarging the diameter, and the diameter of the plug portion is substantially equal to the inner diameter of the distal end portion of the coil. The plug portion is formed so as to fit in the lumen. In addition, the tip plug portion located at the tip of the plug portion has a larger diameter, and is formed substantially the same as the outer diameter of the tip portion of the coil.
That is, an annular step portion is formed at the tip portion of the core shaft, and the tip portion of the coil is formed in contact with the step portion.

In the guide wire, the tip end side of the core shaft is the distal portion of the guide wire, and the rear end portion side of the core shaft is the proximal portion of the guide wire. The distal portion of the guide wire is inserted into the body, and the proximal portion of the guide wire is manipulated by an operator such as a doctor.

JP-T 04-500919

In the guide wire described in Patent Document 1, the coupling between the distal end portion of the core shaft and the distal end portion of the coil becomes strong, and when the guide wire is pulled out from the blood vessel or the like, the distal end portion may be left inside the blood vessel or the like. It is said that there are few.

Here, if the guide wire is inserted into the lesion and the guide wire gets stuck inside the lesion, the operator can push or rotate the guide wire in addition to pulling out the guide wire. , May attempt to unstack the guidewire.

In the conventional guide wire described in Patent Document 1, since the tip end portion of the coil is in contact with the annular stepped portion, the operator removes the proximal portion of the guide wire (the rear end portion of the core shaft). When pulling forward, the step formed on the tip of the core shaft is pulled toward the proximal portion, and at the same time, the tip of the coil contacting the step is pulled toward the proximal portion. It is considered to be.
Thus, since the core shaft and the coil are pulled together, it is considered that only the coil is less likely to fall off.

However, when the operator pushes the proximal portion of the guide wire (the rear end portion of the core shaft) toward the distal portion, the stepped portion formed at the tip portion of the core shaft is separated from the tip portion of the coil. Therefore, it is considered that the pushing force applied to the tip of the core shaft is hardly transmitted to the tip of the coil. Therefore, when the fixing member that fixes the distal end portion of the core shaft and the distal end portion of the coil is damaged, only the distal end portion of the core shaft penetrates forward, and the coil, the fixing member, etc. fall off, and the blood vessel Etc. may be detained.

Thus, it is difficult for the conventional guide wire to sufficiently prevent the parts such as the coil from falling off, and it cannot be said that the safety is sufficiently high.
In particular, in view of the complexity of PTCA procedures in recent years, thin guide wires tend to be used, and when the guide wire is thinned, the tip of the core shaft, the tip of the coil, and the fixing member Therefore, there is a problem that this tendency is remarkable because each member such as the above has to be reduced in size, and if each member is reduced in size, it becomes more easily damaged.

As a result of intensive studies by the inventor to solve the above problems, the tip of the core shaft is disposed in the lumen of the tip of the coil, and the shapes of the tip of the coil and the tip of the core shaft are defined as specific shapes. As a result, it was found that it is possible to efficiently prevent the distal portion of the guide wire from being damaged not only when the guide wire is pulled but also when the guide wire is pushed in. As a result, the guide wire of the present invention has been conceived.

That is, the guide wire of the present invention includes a core shaft having a front end portion and a rear end portion,
A guide wire comprising a first coil body covering the outer periphery of the tip,
The leading end is a leading end located at the forefront of the core shaft, a connecting portion located on the rear end side of the leading end and coupled to the leading end, and the connecting portion. Is also formed including a support portion located on the rear end side and coupled to the connecting portion,
When the tip end portion is seen through from one plane side to the other plane side, the width of the most distal end portion is wider than the width of the support portion, and the first coil body is in contact with the connection portion. And
When the tip portion is seen through from one side surface orthogonal to the plane toward the other side surface, the width of the most distal end portion is narrower than the width of the support portion, and the connection portion includes the first coil. The body is in contact.

The configuration and effects of the guide wire of the present invention will be described in detail below with reference to the drawings.

FIG. 1A is a plan perspective view of a guide wire according to an embodiment of the present invention seen from one plane side to the other plane side, and FIG. FIG. 5 is a side perspective view of the guide wire shown in FIG. 1 seen through from one side surface orthogonal to the plane toward the other side surface.
2A is an enlarged plan view of the guide wire shown in FIG. 1A, and FIG. 2B is an enlarged plan view of the guide wire shown in FIG. 1B. FIG.
In the following description, both the distal portion of the guide wire and the tip portion of the core shaft are indicated by the same reference numeral, and both the proximal portion of the guide wire and the rear end portion of the core shaft are indicated by the same reference numeral. . Moreover, illustration of a part or all of members, such as a coil body, may be abbreviate | omitted.

A guide wire 1 according to the present invention shown in FIGS. 1A and 1B includes a core shaft 10 having a front end portion 11 and a rear end portion 12, and a first coil body 20 covering the outer periphery of the front end portion 11. It consists of.

As shown in FIG. 1A and FIG. 1B, the distal end portion 11 is located at the most distal end portion 13 located at the foremost end of the core shaft 10 and the rear end portion 12 side from the most distal end portion 13. The connecting portion 14 is connected to the foremost portion 13, and the support portion 15 is located on the rear end 12 side of the connecting portion 14 and connected to the connecting portion 14.

The detailed structure of the front-end | tip part 11 of the core shaft 10 is demonstrated using Fig.2 (a) and FIG.2 (b).

As shown in FIG. 2A, when the tip end portion 11 is seen through from one plane side to the other plane side, the width W of the most distal end portion 13 is wider than the width w of the support portion 15, and the connecting portion 14 is in contact with the first coil body 20.

Therefore, even when the guide wire 1 is stacked inside the lesioned part, the connecting part 14 of the core shaft 10 is connected to the proximal part 12 side by pulling the proximal part 12 of the guide wire 1 toward the front by the operator. At the same time, the first coil body 20 in contact with the connecting portion 14 is also pulled following the proximal portion 12 side.
Thus, since the tensile force applied to the core shaft 10 is efficiently transmitted to the first coil 20 and the core shaft 10 and the first coil 20 are pulled together, the first coil 20 is not easily damaged and falls off. Hateful.

Further, as shown in FIG. 2B, when the tip end portion 11 is seen through from one side surface orthogonal to the plane to the other side surface, the width L of the most distal portion 13 is the width of the support portion 15. The first coil body 20 is in contact with the connecting portion 14 narrower than l.

Therefore, even when the guide wire 1 is stacked inside the lesioned part, the connecting part 14 of the core shaft 10 is moved to the distal part 11 by the operator pushing the proximal part 12 of the guide wire 1 to the back side. At the same time, the first coil body 20 in contact with the connecting portion 14 is also pushed in following the distal portion 11 side.
Thus, since the pushing force applied to the core shaft 10 is efficiently transmitted to the first coil 20 and the core shaft 10 and the first coil 20 are pushed together, the first coil 20 is not easily damaged and falls off. Hateful.

In the guide wire 1 of the present invention, since the first coil body 20 and the shape of the distal end portion 11 of the core shaft 10 have the above-described specific relationship, a complicated operation for the operator to pull or push the guide wire is performed. Even if a tensile force or a pushing force is applied to the distal portion of the guide wire by performing, the first coil body and the core shaft easily move together at the distal portion and are not easily damaged.
Therefore, the guide wire 1 of the present invention is highly safe because the first coil 20 and the like are not easily placed inside a blood vessel or the like.

In the guide wire of the present invention, the shape of the connecting portion when the tip end portion is seen through from the one plane side to the other plane side is wide from the support portion side to the most distal portion side. And the shape of the connecting portion when viewed through the tip from the one side to the other side is from the support to the foremost side. It is desirable that the width is narrow and narrow.

In the guide wire of the present invention, the shape of the connecting portion when the tip end portion is seen through from the one plane side to the other plane side is wide from the support portion side to the most distal portion side. The connecting portion in the case where the tip portion is seen through from the one side surface toward the other side surface is formed from the support portion side to the most advanced portion. It is desirable to have a stepped shape with a step that becomes narrower toward the side.

In the guide wire of the present invention, it is preferable that the foremost portion and the connecting portion are formed by subjecting a tip portion of a cylindrical core shaft precursor to flat plate pressing.
In this specification, the core shaft precursor is a rod having various shapes such as a columnar shape before being changed to a core shaft having a desired shape by a flat plate pressing process (that is, before processing). It shall refer to a member.

In the guide wire of the present invention, the guide wire further includes a first tip brazing portion that fixes the tip portion of the first coil body and the connecting portion, and the most advanced portion, the connecting portion, and the first coil. The tip part of the body and the first tip brazing part are a tip part of a cylindrical core shaft precursor, a first coil body precursor in which the tip part of the core shaft precursor is inserted, and the core It is desirable that the front end portion of the shaft precursor and the first front end brazing portion precursor for fixing the front end portion of the first coil body precursor are formed by flat plate pressing.
In the present specification, the first coil body precursor refers to various types such as a cylindrical shape before being changed into a first coil body having a desired shape by flat plate pressing (that is, before processing). It shall refer to a coil body having a shape.
The first tip brazing part precursor is a solder having various shapes such as a spherical shape before being changed to a first tip brazing part having a desired shape by a flat plate pressing process (that is, before processing). It shall refer to the attachment.

The guide wire of the present invention further includes a second coil body covering an outer periphery of the first coil body, and the second coil body contacts the connecting portion via the first coil body. It is desirable that

In the guide wire of the present invention, the first coil body and the connecting portion are fixed by a first tip brazing portion, and the first tip brazing portion and the second coil body are second tip brazing. It is desirable to be fixed by the attaching part.

In the guide wire of the present invention, it is desirable that the material of the first tip brazing part and the material of the second tip brazing part are different from each other.

In the guide wire of the present invention, the first tip brazing portion is made of an alloy containing Au and Sn or Au, and the second tip brazing portion is made of an alloy containing Ag and Sn or Ag. It is desirable that

FIG. 1A is a plan perspective view of a guide wire according to an embodiment of the present invention seen from one plane side to the other plane side, and FIG. FIG. 5 is a side perspective view of the guide wire shown in FIG. 1 seen through from one side surface orthogonal to the plane toward the other side surface. 2A is an enlarged plan view of the guide wire shown in FIG. 1A, and FIG. 2B is an enlarged plan view of the guide wire shown in FIG. 1B. FIG. FIG. 3A is a plan enlarged perspective view of a distal end portion of a guide wire according to another embodiment of the present invention seen from one plane side to the other plane side, and FIG. FIG. 4 is an enlarged side perspective view of the distal end portion of the guide wire shown in FIG. 3A viewed from one side surface orthogonal to the plane toward the other side surface.

Hereinafter, an embodiment of a guide wire of the present invention will be described with reference to the drawings.
Since the guide wire of the present embodiment has the same configuration as the above-described guide wire of the present invention, the following description will be made with reference to FIGS.
In addition, about the matter which overlaps with the description which concerns on the guide wire of this invention, description may be abbreviate | omitted.

FIG. 3A is a plan enlarged perspective view of a distal end portion of a guide wire according to another embodiment of the present invention seen from one plane side to the other plane side, and FIG. FIG. 4 is an enlarged side perspective view of the distal end portion of the guide wire shown in FIG. 3A viewed from one side surface orthogonal to the plane toward the other side surface.
3A and 3B correspond to the reference numerals in FIGS. 2A and 2B, and indicate the same configuration requirements.

The guide wire 1 of the present embodiment shown in FIGS. 1 to 2 includes a core shaft 10 having a front end portion 11 and a rear end portion 12, a first coil body 20 covering the outer periphery of the front end portion 11, and a first coil. A second coil body 30 covering the outer periphery of the body 20, a first tip brazing part 40 for fixing the first coil body 20 and the tip part 11 of the core shaft 10, a first tip brazing part 40 and a second A second tip brazing part 50 for fixing the coil body 30 is formed.

Since the relationship between the distal end portion 11 of the core shaft 10 and the first coil body 20 has already been described in the description of the guide wire of the present invention, the description may be omitted.

2A and 2B, the tip portion 11 of the core shaft 10 is connected to a columnar support portion 15 having a substantially uniform diameter, a connecting portion 14 coupled to the tip of the support portion 15, and It is formed from the most advanced part 13 couple | bonded with the front-end | tip of the part.

The shape of the most advanced portion 13 is a flat plate shape having a substantially uniform width W. In the plan perspective view of FIG. 2A, the width W of the most advanced portion 13 is wider than the width w of the support portion 15, and FIG. In the side perspective view of (b), the width L of the most distal portion 13 is narrower than the width l of the support portion 15.

The shape of the connecting portion 14 shown in the plan perspective view of FIG. 2 (a) is a wide shape (hereinafter also simply referred to as a wide shape in a plan view) inclined broadly from the support portion 15 side toward the most distal portion 13 side. The shape of the connecting portion 14 shown in the side perspective view of FIG. 2B is a narrow shape that is inclined narrowly from the support portion 15 side toward the most distal portion 13 side (hereinafter, simply referred to as a narrow side view width). Say).

Even when the tip portion 11 is seen through from one plane side to the other plane side, the connecting portion is also seen when the tip portion 11 is seen through from the one side surface orthogonal to the plane to the other side surface side. 14 is in contact with the first coil body 20.
Therefore, the tensile force or pushing force applied to the core shaft 10 is efficiently transmitted to the first coil 20, and the first coil 20 is less likely to be damaged and more difficult to drop off.
The shape of the connecting portion is not particularly limited as long as the connecting portion and the first coil body come into contact with each other and the tensile force or pushing force applied to the core shaft can be efficiently transmitted to the first coil body. .
For example, the shape of the connecting portion in the plan perspective view of FIG. 2A is a stepped shape (wide stepped shape in plan view) formed with a step that becomes wider from the support portion side toward the most distal portion side. The shape of the connecting portion in the side perspective view of 2 (b) may be a stepped shape (stepped shape with a narrow side view) formed with a step that becomes narrower from the support portion side toward the most distal portion side. . Even in the shape of such a connecting portion, the tensile force or pushing force applied to the core shaft is efficiently transmitted by the first coil, as in the case of the connecting portion having a wide planar view and a narrow side view. One coil is harder to break and more difficult to fall off.

The ratio of the width W to the width w is preferably 1:10 to 1: 2. When the first coil body 20 is easily brought into contact with the connecting portion 14 and the operator pulls the proximal portion 12 of the guide wire 1 toward the front, the first coil body 20 in contact with the connecting portion 14 becomes closer. This is because the first coil body 20 is less likely to be damaged due to being easily pulled by following the position portion 12 side.

The length ratio between the width L and the width l is preferably 10: 1 to 2: 1. When the first coil body 20 easily comes into contact with the connecting portion 14 and the operator pushes the proximal portion 12 of the guide wire 1 into the back side, the first coil body 20 in contact with the connecting portion 14 is This is because the first coil body 20 is less likely to be damaged by being easily pushed in following the distal portion 11 side.

In the plan perspective view of FIG. 2A and the side perspective view of FIG. 2B, the distal end portion 31 of the second coil body 30 and the connecting portion 14 in contact with the first coil body 20 are spaced apart from each other. It is separated.

However, as shown in the plan perspective view of the guide wire according to another embodiment shown in FIG. 3A, the distal end portion 31 of the second coil body 30 contacts the connecting portion 14 via the first coil body 20. You may do it.
In this embodiment, since the second coil body 30 is disposed so as to cover the first coil body 20, torque generated by rotating the proximal portion 12 of the guide wire is generated by the first coil body 20 and the second coil body 20. It is efficiently transmitted to the most advanced side through the coil body 30 and is excellent in torque transmission as compared with a guide wire having only a single coil body.
Further, since the second coil body 30 is in contact with the connecting portion 14 via the first coil body 20, when the operator pulls the proximal portion 12 of the guide wire 1 toward the front, At the same time that the connecting portion 14 is pulled toward the proximal portion 12, the first coil body 20 and the second coil body 30 that are in contact with the connecting portion 14 are pulled following the proximal portion 12 side. . Therefore, the tensile force applied to the core shaft 10 is efficiently transmitted to the first coil body 20 and the second coil body 30, and the core shaft 10, the first coil 20, and the second coil body 30 are pulled together. The first coil 20 and the second coil body 30 are not easily damaged and are not easily dropped off.

3B, the distal end portion 31 of the second coil body 30 and the connecting portion 14 in contact with the first coil body 20 are spaced apart from each other.
However, in the side perspective view of FIG. 3B, the distal end portion 31 of the second coil body 30 may be in contact with the connecting portion 14 via the first coil body 20.
When the second coil body 30 is in contact with the connecting portion 14 via the first coil body 20, when the operator pushes the proximal portion 12 of the guide wire 1 into the back side, the core shaft 10 At the same time that the connecting portion 14 is pushed into the distal portion 11 side, the first coil body 20 and the second coil body 30 that are in contact with the connecting portion 14 are pushed in following the distal portion 11 side. . Therefore, the pushing force applied to the core shaft 10 is efficiently transmitted to the first coil body 20 and the second coil body 30, and the core shaft 10, the first coil 20, and the second coil body 30 are pushed together. The first coil 20 and the second coil body 30 are not easily damaged and are not easily dropped off.

Returning to the guide wire embodiment shown in FIGS. 2 (a) and 2 (b), the description will be continued.
The distal end portion 21, the most distal end portion 13, the connecting portion 14, and a part of the support portion 15 of the first coil body 20 are fixed by a first distal end brazing portion 40.
In addition, the tip portion 21 of the first coil body 20, the most distal end portion 13, the coupling portion 14, and the entire first tip brazing portion 40 that fixes a part of the support portion 15 and the tip portion 31 of the second coil body 30 A second tip brazing portion 50 that forms the outer periphery of the distal end of the distal portion 11 of the guide wire 1 is formed. That is, the first tip brazing part 40 and the second coil body 30 are fixed by the second tip brazing part 50.
The shape of the second tip brazing part 50 is hemispherical.
As described above, the fixing member that fixes the tip portion 11 of the core shaft 10 and the first coil body 20 is the first tip brazing portion 40, and the second tip brazing member is a fixing member different from the first tip brazing portion 40. When the first tip brazing portion 40 and the second coil body 30 are fixed by the brazing portion 50, the guide wire 1 can be easily manufactured and the degree of freedom in designing the shape and the like is improved.
However, the configuration of the tip brazing portion is not limited to the configuration formed by the first tip brazing portion and the second tip brazing portion, and may be formed from a single tip brazing portion. .

The rear end portion 22 of the first coil body 20 and the support portion 15 of the core shaft 10 are fixed to each other by the first rear end brazing portion 60.
Note that one or a plurality of first intermediate brazing portions may be formed between the first front end brazing portion 40 and the second front end brazing portion 50 and the first rear end brazing portion 60. Good.

The rear end portion 32 of the second coil body 30 is located closer to the proximal portion 12 of the guide wire 1 than the rear end portion 22 of the first coil body 20, and the core shaft is formed by the second rear end brazing portion 70. Ten support portions 15 are fixed to the rear end.
The intermediate portion 33 of the second coil body 30 is positioned closer to the proximal portion 12 side of the guide wire 1 than the first rear end brazing portion 60, and the core shaft 10 is supported by the second intermediate brazing portion 80. The intermediate position of the portion 15 is fixed.

The material of the first tip brazing part 40 and the material of the second tip brazing part 50 are different from each other. When the material of the first tip brazing part 40 and the material of the second tip brazing part 50 are different from each other, the material of the brazing material that forms the brazing part can be appropriately selected according to the desired effect. Desirable in terms.
Specifically, the first tip brazing portion 40 is made of an alloy containing Au and Sn or Au, and the second tip brazing portion 50 is made of an alloy containing Ag and Sn or Ag. . Therefore, the first tip brazing part 40 is excellent in strength and corrosion resistance, and the second tip brazing part 50 is excellent in cost and corrosion resistance.
However, the material of the first tip brazing part 40 and the second tip brazing part 50 is not limited to these materials, and examples thereof include aluminum alloy, Ag, Au, zinc, Sn—Pb alloy, Sn—Au alloy, Any material selected from materials such as Pb—Ag alloy and Sn—Ag alloy may be used.

As a material of each brazing part other than the first tip brazing part 40 and the second tip brazing part 50, for example, aluminum alloy, Ag, Au, zinc, Sn-Pb alloy, Sn-Au alloy, Pb-Ag Materials such as alloys and Sn-Ag alloys can be used. Among these, Au, Sn—Au alloy, and Sn—Ag alloy are particularly preferable. This is because the strength of the brazing portion becomes higher.

Hereinafter, the other structure regarding the core shaft 10 is demonstrated, referring FIG. 1 (a) and FIG.1 (b).
The rear end of the support portion 15 is coupled to a tapered columnar tapered portion 16 having a diameter reduced toward the most distal end portion 13 side.
The rear end of the tapered portion 16 is coupled to the cylindrical large diameter portion 17.
A connecting portion 17a for attaching an extension guide wire or the like is formed at the rear end of the large diameter portion 17.

The core shaft 10 may be made of a material such as a super elastic alloy such as stainless steel or a Ni—Ti alloy, a piano wire, or a tungsten wire, for example.
Examples of the stainless steel include stainless steels such as martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, austenite, ferrite duplex stainless steel, and precipitation hardened stainless steel.
Among these, austenitic stainless steel is desirable, and SUS304, SUS316 or SUS316L is more desirable.

Hereinafter, the other structure regarding the 1st coil body 20 is demonstrated.
The first coil body 20 is formed by winding a plurality of strands in a spiral shape, and is a tubular body having a through hole inside. Since the first coil body 20 is formed by spirally winding a plurality of strands, the torque transmission is excellent.
In addition, the 1st coil body may be formed by winding a single strand helically, if flexibility is calculated | required.

The distal end portion 11 (the most distal portion 13, the connecting portion 14 and the support portion 15) is inserted into the first coil body 20, and the first coil body 20 has the most distal portion 13, the connecting portion 14 and the supporting portion 15 inserted therein. Covers a part of
As already described, the first coil body 20 is arranged along the outer shape of the connecting portion 14 in both the plan perspective view and the side perspective view, and is in contact with the connecting portion 14.

Hereinafter, the other structure regarding the 2nd coil body 30 is demonstrated.
The second coil body 30 is formed by winding a single or a plurality of strands in a spiral shape, and is a straight tubular body having a through hole inside. The inner diameter of the second coil body 30 is larger than the outer diameter of the first coil body 20.
The shape of the second coil body may be a tapered shape with a diameter decreasing from the rear end to the front end of the second coil body. A guide wire having a tapered second coil body is excellent in biting into a hard lesion such as a chronic complete occlusion lesion.

The distal end portion 11 (the most distal end portion 13, the connecting portion 14 and the support portion 15) and the first coil body 20 are inserted into the second coil body 30, and the second coil body 30 includes the distal end portion 11 and the first coil portion 30. The coil body 20 is covered. In addition, the front-end | tip part 11, the 1st coil body 20, and the inner wall of the 2nd coil body 30 are spaced apart by predetermined spacing.

As shown in FIG. 2A and FIG. 2B, the strands wound around the outer periphery of the tip portion 11 of the distal end portion 11 in the second coil body 30 have a predetermined pitch. It is formed with a gap and is highly flexible.
On the other hand, in the second coil body 30, the wire wound around the outer periphery of the portion from the support portion 15 of the tip end portion 11 is closely wound and has high rigidity and excellent torque transmission.

The material of the strands forming the first coil body 20 and the second coil body 30 is made of, for example, a super elastic alloy such as stainless steel or Ni-Ti alloy, a piano wire, a tungsten wire, or the like. Also good.
Examples of the stainless steel include stainless steels such as martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, austenite, ferrite duplex stainless steel, and precipitation hardened stainless steel.
Among these, austenitic stainless steel is desirable, and SUS304, SUS316 or SUS316L is more desirable.

The guide wire of this embodiment can be manufactured through the following processes, for example.
A cylindrical core shaft precursor having different diameters is produced by tapering or pressing the wire rod so as to have the predetermined shape described above, and the cylindrical tip of the produced core shaft precursor. The first coil body precursor, the front end of the core shaft precursor (two locations), the rear end of the first coil body precursor, and the front end of the first coil body precursor. Braze each one. Of the produced brazing parts, the brazing part that joins the tip of the first coil body precursor and the tip part of the core shaft precursor becomes the first tip brazing part precursor, and the first coil The brazing part that joins the rear end of the body precursor and the front end of the core shaft precursor becomes the first rear end brazing part precursor. In addition, you may form another brazing part as needed.

Next, the first tip brazing part precursor is subjected to flat plate pressing, thereby deforming the tip part of the core shaft precursor, the tip of the first coil body precursor, and the first tip brazing part precursor into a flat plate shape. Thus, the tip portion (the most advanced portion and the connecting portion), the first coil body, and the first tip brazing portion of the core shaft having the predetermined shape described above are formed.
The shape of the connecting portion can be variously changed depending on conditions such as the shape of the mold for performing the flat plate pressing process. Examples of the shape of the connecting portion manufactured by the flat plate pressing process include a wide planar view and a narrow lateral view as shown in FIGS. 2A and 2B, a wide planar view and a staircase shape. Examples of the shape include a stepped shape with a narrow side view.
Further, the shape of the connecting portion may be formed by a cutting process such as a centerless polishing process in addition to the flat plate pressing process. However, in consideration of ease of manufacture, etc., it is more desirable to use flat plate pressing.

Subsequently, the second coil body is coated on the first coil body and brazed at a predetermined position to form a second tip brazed portion and the like, thereby manufacturing the guide wire of this embodiment.
If necessary, a part of or the entire outer peripheral surface of the guide wire may be coated with a hydrophilic polymer, a silicon polymer, or the like.

DESCRIPTION OF SYMBOLS 1 Guide wire 10 Core shaft 11 Front-end | tip part 12 Back-end part 13 The most advanced part 14 Connection part 15 Support part 20 1st coil body

Claims (9)

A core shaft having a front end and a rear end;
A guide wire comprising a first coil body covering the outer periphery of the tip,
The leading end is a leading end located at the forefront of the core shaft, a connecting portion located on the rear end side of the leading end and coupled to the leading end, and the connecting portion. Is also formed including a support portion located on the rear end side and coupled to the connecting portion,
When the tip end portion is seen through from one plane side to the other plane side, the width of the most distal end portion is wider than the width of the support portion, and the first coil body is in contact with the connection portion. And
When the tip portion is seen through from one side surface orthogonal to the plane toward the other side surface, the width of the most distal end portion is narrower than the width of the support portion, and the connection portion includes the first coil. A guide wire characterized by contact with the body. The shape of the connecting portion when the front end portion is seen through from the one plane side toward the other plane side is a wide shape that is inclined wide from the support portion side toward the most distal portion side. ,
The shape of the connecting portion in the case where the tip end portion is seen through from the one side surface side to the other side surface side is a narrow shape inclined narrowly from the support portion side toward the most distal portion side. The guide wire according to claim 1. When the tip end portion is seen through from the one plane side toward the other plane side, the shape of the connecting portion is formed with a step that becomes wider from the support portion side toward the most distal portion side. Stepped,
When the tip end portion is seen through from the one side surface side to the other side surface side, the shape of the connecting portion is formed with a step that becomes narrower from the support portion side toward the most distal end portion side. The guide wire according to claim 1, which has a stepped shape. The guide wire according to any one of claims 1 to 3, wherein the forefront portion and the connecting portion are formed by subjecting a tip portion of a cylindrical core shaft precursor to flat plate pressing. A first tip brazing portion for fixing the tip portion of the first coil body and the connecting portion;
The tip part, the connecting part, the tip part of the first coil body, and the first tip brazing part have a tip part of a cylindrical core shaft precursor and a tip part of the core shaft precursor inside. By flat plate pressing the inserted first coil body precursor and the first tip brazing portion precursor for fixing the tip portion of the core shaft precursor and the tip portion of the first coil body precursor. The guide wire according to claim 1, wherein the guide wire is formed. A second coil body covering the outer periphery of the first coil body;
The guide wire according to any one of claims 1 to 5, wherein the second coil body is in contact with the coupling portion via the first coil body. The first coil body and the connecting portion are fixed by a first tip brazing portion, and the first tip brazing portion and the second coil body are fixed by a second tip brazing portion. Item 7. A guide wire according to item 6. The guide wire according to claim 7, wherein a material of the first tip brazing part and a material of the second tip brazing part are different from each other. The said 1st front-end | tip brazing part is formed from the alloy or Au containing Au and Sn, and the said 2nd front-end | tip brazing part is formed from the alloy or Ag containing Ag and Sn. Guide wire.

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