JP7300905B2 - guide wire - Google Patents

Description

The present disclosure relates to guidewires.

For treatment of stenosis in blood vessels such as the coronary arteries surrounding the heart, and treatment of areas where the blood vessels are completely occluded due to progress of calcification (e.g., chronic total occlusion: CTO), therapeutic instruments such as balloon catheters. A guide wire is inserted into the blood vessel to guide them in advance.

For the guide wire, for example, the tip of the core wire of the guide wire is composed of a plurality of cones, and the inclination angles at the nodes of the cones have a certain relationship, so that it can pass through the lesion site. There have been proposed those with improved properties (see, for example, Patent Document 1). Also proposed is a catheter intraluminal device (guidewire) comprising a coil made up of an elongated piece of material having teeth (see Patent Document 2).

Patent No. 6281731 JP-A-9-294812

However, in the guide wire of Patent Document 1, the outer diameter of the coil wound around the tip of the core wire is always constant. In the catheter intraluminal device of Patent Literature 2, even if the coil is rotated, one turn portion of the coil wire is fixed to the adjacent one turn portion by teeth to prevent rotation. Therefore, the outer diameter of the coil is always constant. Therefore, if the hole diameter of the narrowed portion is smaller than the outer diameter, it is difficult for the coil to pass through the narrowed portion.

The present disclosure has been made based on the circumstances as described above, and an object thereof is to provide a guide wire that allows the coiled body to easily pass through the stenosis.

In order to solve the above object, a guidewire according to one aspect of the present disclosure includes a core wire having a distal end and a proximal end, a distal tip fixed to the distal end of the core wire, and a helical coil wire, a coil body provided around a core wire and having a distal end fixed to the proximal end of the distal tip; and a coil body provided around the core wire, rotatable around the core wire, and having a distal end proximal to the coil body. a hollow shaft fixed to a portion, wherein a gap is provided between a proximal first portion and a distal second portion of the coil wire that are adjacent to each other along the length of the core wire. an engaging portion is provided on the second portion side of the first portion; an engaged portion is provided on the first portion side of the second portion; The first portion and the second portion are configured to be relatively rotatable.

The engagement between the engaging portion and the engaged portion may constitute a ratchet mechanism that restricts the rotation direction of the coil body to the diameter contraction direction of the coil body.

The engaging portion may have a convex shape, the engaged portion may have a concave shape, and the engaging portion may have a shape corresponding to the shape of the engaged portion.

The convex shape of the engaging portion includes a first engaging surface and a second engaging surface positioned proximal to the first engaging surface in the length direction of the core wire, and The angle of the first engagement surface with respect to the length direction of the coil wire may be greater than the angle of the second engagement surface with respect to the length direction of the coil wire.

The engaging portion may have a concave shape, the engaged portion may have a convex shape, and the engaging portion may have a shape corresponding to the shape of the engaged portion.

The concave shape of the engaging portion includes a first engaging surface and a second engaging surface located on the distal end side of the first engaging surface in the length direction of the core wire, and the coil The angle of the first engagement surface with respect to the length of the wire may be less than the angle of the second engagement surface with respect to the length of the coil wire.

A plurality of the engaging portions and the engaged portions may be provided along the length direction of the coil wire.

The plurality of engaging portions may be provided at regular intervals along the length direction of the coil wire, and the plurality of engaged portions may be provided at regular intervals.

The spiral coil wire may be configured by spirally winding a wire.

The spiral coil wire may be formed by forming a slit in a cylindrical pipe.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a guide wire that allows a coiled body to be easily passed through a stricture.

1 is a side view of a guidewire in accordance with an embodiment of the present disclosure; FIG. (a) is a schematic diagram of adjacent metal wires of a coil body, and (b) is an explanatory diagram of an engaging portion. FIG. 4 is a side view of the guidewire with the coiled body contracted; FIG. 10 is a side view of the guidewire with the coiled body having a reduced diameter; FIG. 10 is an explanatory diagram of a diameter reduction and restoration process of a coil body; FIG. 4 is an explanatory diagram of a process in which a guidewire passes through a stenotic part of a blood vessel; FIG. 11 is a side view of a guidewire according to a modification; It is explanatory drawing of the engaging part which concerns on a modification. (a) is a schematic diagram of adjacent metal wires of a coil body according to a modification, and (b) is an explanatory diagram of an engaging portion according to the modification. It is explanatory drawing of the engaging part which concerns on a modification.

A guide wire according to an embodiment of the present disclosure will be described below with reference to the drawings, but the present invention is not limited only to the embodiments described in the drawings. In the present disclosure, the distal end means the end of the guidewire where the distal tip is located, and the proximal end means the end opposite to the distal end.

FIG. 1 is a side view of a guidewire 1 according to this embodiment.

As shown in FIG. 1, the guidewire 1 includes a core wire 2, a coiled body 10, a distal tip 3, and a hollow shaft 4. As shown in FIG.

The core wire 2 has a substantially constant outer diameter from its proximal end to its distal end and extends from the proximal end of the guidewire 1 to its distal end. Materials constituting the core wire 2 include, for example, stainless steel such as SUS304, metal materials such as nickel-titanium alloys, cobalt-chromium alloys, and the like. The total length of the core wire 2 is, for example, 1,800 to 3,000 mm, and the outer diameter of the core wire 2 is, for example, 0.02 to 0.06 mm.

The coil body 10 is provided around the tip of the core wire 2 . A detailed configuration of the coil body 10 will be described later.

The distal tip 3 has a substantially hemispherical shape, is provided at the distal end of the guide wire 1 , and joins the distal end of the core wire 2 and the distal end of the coil body 10 . The tip 3 is formed by brazing using metal brazing such as Sn--Pb alloy, Pb--Ag alloy, Sn--Ag alloy, and Au--Sn alloy.

The hollow shaft 4 is rotatably provided around the core wire 2 and extends from the proximal end of the coil body 10 toward the proximal end of the guide wire 1 . A distal end of the hollow shaft 4 is joined to a proximal end of the coil body 10 . The distal end of the hollow shaft 4 and the proximal end of the coil body 10 are joined by brazing, for example, with metal brazing such as Sn--Pb alloy, Pb--Ag alloy, Sn--Ag alloy, and Au--Sn alloy.

Examples of the material forming the hollow shaft 4 include stainless steel such as SUS304, metal materials such as nickel-titanium alloys, cobalt-chromium alloys, and the like. The entire length of the hollow shaft 4 is shorter than the core wire 2 by the length of the coil body 10 and the tip 3, and the outer diameter of the hollow shaft 4 is, for example, 0.25 to 0.5 mm. The proximal end of the core wire 2 protrudes further to the proximal side than the proximal end of the hollow shaft 4 . Although the core wire 2 is not fixed to the hollow shaft 4 in this embodiment, a portion of the core wire 2 may be fixed somewhere on the inner peripheral surface of the hollow shaft 4 . At the end of the hollow shaft 4 on the proximal side, the operator performs a pressing operation, a rotating operation, and the like on the guide wire 1 .

Next, the configuration of the coil body 10 will be described.
2A is a schematic diagram of adjacent metal wires 11 of the coil body 10, and FIG.

As shown in FIG. 1, the coil body 10 is formed in a hollow cylindrical shape by spirally winding a single metal wire 11 around a core wire 2 . The distal end of the coiled body 10 is joined to the distal tip 3 and the proximal end of the coiled body 10 is joined to the hollow shaft 4 . The metal wire 11 corresponds to a coil wire.

When no external force acts on the coil body 10 , adjacent metal wires 11 of the coil body 10 are separated from each other in the longitudinal direction of the core wire 2 and have gaps 12 . That is, as shown in FIG. 2( a ), among the metal wires 11 adjacent to each other along the length direction of the core wire 2 , the metal wire 11 on the base end side is the first portion 15 , and the metal wire 11 on the tip side is the first portion 15 . When the wire 11 is used as the second portion 16 , a gap 12 is formed between the first portion 15 and the second portion 16 . The coil body 10 is configured such that the first portion 15 and the second portion 16 are relatively rotatable. That is, the first portion 15 is rotatable without being fixed to the adjacent second portion 16 .

A plurality of engaging portions 13 are provided at regular intervals along the winding direction of the metal wire 11 on the second portion 16 side of the first portion 15 . A plurality of engaged portions 14 are provided at regular intervals along the winding direction on the first portion 15 side of the second portion 16 . That is, in the metal wires 11 adjacent to each other, the engaging portion 13 is provided on the distal end side portion of the first portion 15, and the engaged portion 14 is provided on the proximal side portion of the second portion 16. ing. The winding direction of the metal wire 11 corresponds to the length direction of the coil wire.

As shown in FIG. 2A, each engaging portion 13 has a convex shape composed of a first engaging surface 13A and a second engaging surface 13B. The second engaging surface 13B is located on the proximal side in the winding direction of the metal wire 11 with respect to the first engaging surface 13A. Each first engagement surface 13A is parallel to the plane containing the longitudinal axis of the guidewire 1. As shown in FIG. The second engaging surface 13B extends from the tip of the first engaging surface 13A toward the proximal end of the first engaging surface 13A adjacent to the first engaging surface 13A in the winding direction on the proximal side. ing. By sequentially forming the first engaging surface 13A and the second engaging surface 13B along the winding direction of the metal wire 11, a plurality of engaging portions 13 are provided on the tip side of the metal wire 11. be done.

As shown in FIG. 2B, the angle α1 of the first engaging surface 13A with respect to the winding direction of the metal wire 11 is larger than the angle α2 of the second engaging surface 13B with respect to the winding direction of the metal wire 11. Largely configured. That is, with respect to the first engaging surface 13A, the second engaging surface 13B located on the proximal side in the direction in which the metal wire 11 is pulled from the proximal side by the rotation of the coil body 10 along the arrow R1. The angle α2 is configured to be smaller than the angle α1 of the first engaging surface 13A. The winding direction of the metal wire 11 is along the dashed line L1 in FIG. 2(b).

As shown in FIG. 2A, each engaged portion 14 has a concave shape composed of a first engaged surface 14A and a second engaged surface 14B. Each first engaged surface 14A is parallel to a plane containing the longitudinal axis of the guidewire 1. As shown in FIG. The second engaged surface 14B extends from the tip of the first engaged surface 14A to the proximal end of the first engaged surface 14A adjacent to the first engaged surface 14A in the winding direction on the proximal side. extending towards. By sequentially forming the first engaged surface 14</b>A and the second engaged surface 14</b>B along the winding direction of the metal wire 11 , the plurality of engaged portions 14 are formed at the base of the metal wire 11 . It is provided on the end side.

Each engaging portion 13 has a shape corresponding to each engaged portion 14 . Therefore, when the metal wires 11 of the coil body 10 are in contact with each other in the length direction of the core wire 2, the engaging portion 13 is engaged with the engaged portion 14 without a gap. When no external force is applied to the coil body 10 , the plurality of engaging portions 13 and the plurality of engaged portions 14 of the metal wires 11 adjacent to each other are arranged to face each other in the longitudinal direction of the core wire 2 . formed.

The wire diameter of the metal wire 11 of the coil body 10 is, for example, 0.03 to 0.1 mm, and the outer diameter of the coil body 10 is, for example, 0.25 to 0.5 mm. The length along the length direction of is 100 to 200 mm. The pitch of the metal wires 11 is, for example, 11.00 to 13.88 pitch/mm when the wire diameter is 0.072 mm. When the pitch of the metal wires 11 is 13.88 Pitch/mm, the metal wires 11 are closely wound. 019 mm.

The plurality of engaging portions 13 and the plurality of engaged portions 14 of the metal wire 11 are formed by finely processing a metal wire having a circular cross section using, for example, a femtosecond order ultrashort pulse laser. For example, as shown in FIG. 2, a plurality of engaging portions 13 are formed by cutting a portion between a dotted line and a solid line in a metal element wire having a circular cross section before processing, which is indicated by a dotted line, by laser processing. and a plurality of engaged portions 14 are formed. The cut shape and dimensions are determined based on the outer diameter of the coil body 10, the wire diameter of the metal wire 11, the number of divisions per pitch, the groove depth, and the like. The number of divisions per pitch (the number of engaging portions 13 (engaged portions 14)) is, for example, 4-20. The groove depth is the length of the first engaging surface 13A and the first engaged surface 14A along the longitudinal direction of the core wire 2, and is 10 to 20% of the wire diameter. In this embodiment, for example, the outer diameter of the coil body 10 is 0.345 mm, the wire diameter of the metal wire 11 is 0.072 mm, the number of divisions per pitch is 8, and the groove depth is 0.010 mm.

Next, the process of diameter reduction and restoration of the coil body 10 of the guide wire 1 and the process of the guide wire 1 passing through the stenotic part of the blood vessel will be described with reference to the drawings.
FIG. 3 is a side view of the guide wire 1 with the coil body 10 contracted.
FIG. 4 is a side view of the guide wire 1 with the coil body 10 contracted.
FIG. 5 is an explanatory diagram of the diameter reduction and restoration process of the coil body 10. FIG.
FIG. 6 is an illustration of the process by which the guide wire 1 passes through the stenosis of the blood vessel.

As shown in FIGS. 1 and 5A, when no external force is applied to the guidewire 1, the metal wires 11 adjacent to each other in the longitudinal direction of the core wire 2 are spaced apart with a gap 12 therebetween. ing. In FIG. 5(a), the arrow F1 indicates the force pushing the hollow shaft 4 from the input side. As shown in FIG. 6(a), the operator pushes the hollow shaft 4 from the input side (base end side) while the distal tip 3 is being pressed against the constriction S in the blood vessel V. As shown in 5(b), the metal wires 11 adjacent to each other contact each other so as to eliminate the gap 12, and the coil body 10 contracts. In FIG. 5(b), the arrow F2 indicates the reaction force from the constricted portion S. As shown in FIG. In this manner, the coil body 10 is contracted by the pushing force F1 from the input side and the reaction force F2 from the constricted portion S. As a result, in the metal wire 11, each engaging portion 13 is engaged with the opposing engaged portion 14. As shown in FIG. In addition, in FIG.5(b), the engaging part 13C which is one of the some engaging part 13 engages with the to-be-engaged part 14C which opposes.

The hollow shaft 4 is rotated in the rotation direction of arrow R1 shown in FIGS. 4 and 5(c). The direction of rotation of arrow R1 is opposite to the winding direction of metal wire 11 from the proximal end to the distal end, and is the direction in which coil body 10 is reduced in diameter. At this time, in the coil body 10, the first portion 15 rotates without being prevented from moving to the second portion 16, as described with reference to FIG. 2(a). As a result, as shown in FIGS. 4 and 6B, the coil body 10 is twisted, and the diameter of the central portion of the coil body 10 is reduced. 5(b) and 5(c), the engagement between each engaging portion 13 and each engaged portion 14 is released by the twisting, and the engaging portion 13C is rotated in the rotational direction. engages with the engaged portion 14D positioned next to the engaged portion 14C. In this state, the first engaging surface 13A (see FIG. 2) of the engaging portion 13 and the first engaged surface 14A (see FIG. 2) of the engaged portion 14 are in contact with each other, and the first engaging surface 13A and the first engaged surface 14A are parallel to the plane containing the longitudinal axis of the guidewire 1. As shown in FIG. Therefore, the engagement between the engaging portion 13 and the engaged portion 14 constitutes a ratchet mechanism that restricts the rotation direction (twisting direction) of the coil body 10 in the direction of diameter reduction. Therefore, a restoring force is generated in the coil body 10 to return the outer diameter to its original diameter. Return to diameter is suppressed.

Here, "restricting the rotation direction of the coil body 10 to the diameter-reducing direction" means that the coil body 10 is contracted with a torque lower than the torque required to rotate the coil body 10 in the direction opposite to the diameter-reducing direction. It includes restricting to a radially rotatable state and restricting the coil body 10 to a radially contracting rotatable state only. As described above, the angle α1 of the first engaging surface 13A with respect to the winding direction of the metal wire 11 is made larger than the angle α2 of the second engaging surface 13B with respect to the winding direction of the metal wire 11. . That is, with respect to the first engaging surface 13A, the second engaging surface 13B located on the proximal side in the direction in which the metal wire 11 is pulled from the proximal side by the rotation of the coil body 10 along the arrow R1. Since the angle α2 is smaller than the angle α1 of the first engaging surface 13A, it is possible to provide a ratchet mechanism that restricts the rotational direction of the coil body 10 in the diameter-reducing direction.

At this time, the number of turns of the coil body 10 increases compared to before the diameter of the coil body 10 is reduced. Note that the increase in the number of turns includes an increase of one turn or less. In addition, when the central portion of the coil body 10 is contracted in diameter, the number of the engaging portions 13 and the engaged portions 14 at the central portion is the same as the number of the engaging portions 13 and the engaged portions 14 at both ends of the coil body 10 . less than the number of

When the operator further pushes the hollow shaft 4 from the input side, the distal tip 3 and the distal end portion of the coil body 10 pass through the narrowed portion S. As a result, the central portion of the coil body 10 whose diameter has been reduced passes through the constricted portion S, and the reaction force F2 from the constricted portion S is eliminated. (d), restored to its original length and outer diameter as shown in FIG. 6(c). Restoration of the length of the coil body 10 is restoration in the advancing direction. In FIG. 5(d), a metal wire 11A indicated by a dotted line indicates a metal wire in a diameter-reduced state. In this manner, the coiled body 10 positioned at the distal end of the guidewire 1 passes through the constricted portion S.

Further, as shown in FIG. 6(d), when the coil body 10 passes through the narrowed portion S, the outer diameter of the coil body 10 returns to its original size, so that the coil body 10 comes into contact with the narrowed portion S and the coil body 10 Even if the coil body 10 is stuck, it is possible to pass the coil body 10 by rotating the hollow shaft 4 as described above with the abutting portion between the coil body 10 and the narrowed portion S as a fulcrum to reduce the diameter of the coil body 10 . can.

Next, the mode of use of the guidewire 1 will be described. The guide wire 1 is inserted into the femoral blood vessel from its distal end and advanced along the blood vessel to the coronary artery. Next, after passing through a treatment site such as a stenosis of a blood vessel or a false lumen near the CTO, a therapeutic instrument such as a balloon catheter or a stent is transported along the guidewire 1, and various treatments are performed at the treatment site. do. After the procedure is completed, the guidewire 1 is withdrawn from the body retrograde the blood vessel, completing the series of operations.

As described above, according to the guide wire 1 of the present disclosure, the distal tip 3 is pressed against the constricted portion S, the adjacent metal wires 11 are brought into contact so as to eliminate the gap 12, and the hollow shaft 4 is rotated. , the coil body 10 is twisted so that the diameter of the coil body 10 is reduced, and the engaging portion 13 is engaged with the engaged portion 14 . As a result, it is possible to suppress the slippage between the metal wires 11, and it is possible to suppress the coil body 10 from returning to its original shape due to its restoring force. Therefore, the coil body 10 can be easily passed through the narrowed portion S without requiring a large pressing force from the base end side to the hollow shaft 4 . Therefore, the operability when passing the guide wire 1 through the narrowed portion S can be improved.

Further, when the coil body 10 passes through the constricted portion S, the coil body 10 returns to its original length due to its restoring force, and the gap 12 between the adjacent metal wires 11 also restores. As a result, a propulsive force is generated in the coil body 10 in the advancing direction, so that the guide wire 1 can be easily passed through the narrowed portion S.

Further, since the engagement between the engaging portion 13 and the engaged portion 14 constitutes a ratchet mechanism that restricts the rotation direction of the coil body 10 in the diameter-reducing direction, the coil body 10 with its diameter reduced returns to its original state by its restoring force. It is possible to further suppress the return to the shape of , and it is possible to further improve the operability when passing through the narrowed portion S.

Further, the engaging portion 13 has a convex shape, the engaged portion 14 has a concave shape, and the engaging portion 13 has a shape corresponding to the shape of the engaged portion 14, so that the engaging portion 13 can be engaged. The contact area when engaged with the engaging portion 14 can be increased, and the pushability of the guide wire 1 can be improved.

The convex shape of the engaging portion 13 includes a first engaging surface 13A and a second engaging surface 13B located on the proximal side in the length direction of the core wire 2 with respect to the first engaging surface 13A, The angle α1 of the first engaging surface 13A with respect to the winding direction of the metal wire 11 is made larger than the angle α2 of the second engaging surface 13B with respect to the winding direction of the metal wire 11 . With this configuration, it is possible to provide a ratchet mechanism that restricts the direction of rotation of the coil body 10 in the diameter-reducing direction.

Since a plurality of engaging portions 13 and engaged portions 14 are provided along the winding direction of the metal wire 11, the coil body 10 is further prevented from returning to its original shape due to its restoring force. be able to.

Along the winding direction of the metal wire 11, a plurality of engaging portions 13 are provided at regular intervals, and a plurality of engaged portions 14 are provided at regular intervals. Since the engaging portion 13 and the engaged portion 14 can be switched along the winding direction of the metal wire 11 by rotating the coil body 10, the diameter of the coil body 10 can be easily reduced. The coil body 10 can be easily passed through the narrowed portion S.

Since the coil body 10 is configured by winding the metal wire 11, by forming the engaging portion 13 and the engaged portion 14 on the outer peripheral surface of the metal wire 11 by laser processing or the like, the coil body 10 of the present disclosure can be obtained. The guidewire 1 can be manufactured easily.

It should be noted that the present disclosure is not limited to the configurations of the above-described embodiments, but is indicated by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims. be done.

For example, in the above-described embodiment, the coil body 10 is configured by winding the metal wire 11, but like the guide wire 21 shown in FIG. 32 may be formed, and the coil body 30 may be configured by the coil wire 31 having the engaging portion 33 and the engaged portion 34 . In this modified example, the slit 32 corresponds to the gap.

Moreover, a jacket made of resin may be formed on the outer peripheral surfaces of the coil bodies 10 and 30 . The jacket is, for example, a heat-shrinkable tube, and the resin constituting the jacket only needs to be elastic enough to follow the expansion and contraction of the coil bodies 10 and 30. For example, urethane coating material, hydrophilic coating material, etc. is mentioned.

Further, the shapes of the engaging portion 13 and the engaged portion 14 are not limited to the shapes shown in the above embodiment, and may be other shapes. For example, the first engaging surface 13A and the first engaged surface 14A are surfaces parallel to the plane containing the long axis of the guidewire 1, but they may be surfaces inclined to the plane. Further, although a plurality of engaging portions 13 and engaged portions 14 are formed, only one engaging portion 13 and a plurality of engaged portions 14 may be provided, or a plurality of engaging portions 13 may be provided. Only one engaged portion 14 may be provided.

As shown in FIG. 8, the winding direction of the metal wire 11 may be opposite to the winding direction of the metal wire 11 in the above embodiment. In this case, the angle α1 of the first engaging surface 13A with respect to the winding direction of the metal wire 11 is set larger than the angle α2 of the second engaging surface 13B with respect to the winding direction of the metal wire 11 . That is, with respect to the first engaging surface 13A, the second engaging surface located on the proximal side in the direction in which the metal wire 11 is pulled toward the proximal side by the rotation of the coil body 10 along the arrow R2 in FIG. The angle α2 of the surface 13B is configured to be smaller than the angle α1 of the first engaging surface 13A. The winding direction of the metal wire 11 is the direction along the dashed line L2 in FIG. located on the edge.

In the above embodiment, the engaging portion 13 has a convex shape and the engaged portion 14 has a concave shape, but as shown in FIG. may be convex. The engaging portion 13 is composed of a first engaging surface 13A and a second engaging surface 13B. The engaged portion 14 is composed of a first engaged surface 14A and a second engaged surface 14B. The engaging portion 13 has a shape corresponding to the engaged portion 14 . Thereby, the contact area when the engaging portion 13 is engaged with the engaged portion 14 can be increased, and the pushability of the guide wire 1 can be improved. The second engaging surface 13B is located on the tip side in the winding direction of the metal wire 11 with respect to the first engaging surface 13A.

As shown in FIG. 9B, the angle β1 of the first engaging surface 13A with respect to the winding direction of the metal wire 11 is larger than the angle β2 of the second engaging surface 13B with respect to the winding direction of the metal wire 11. Largely configured. That is, with respect to the first engaging surface 13A, the angle of the second engaging surface 13B located on the distal side in the direction in which the metal wire 11 is pulled toward the proximal side by the rotation of the coil body 10 along the arrow R1. β2 is configured to be smaller than the angle β1 of the first engaging surface 13A. The winding direction of the metal wire 11 is along the dashed line L1 in FIG. 9(b). With this configuration, it is possible to provide a ratchet mechanism that restricts the direction of rotation of the coil body 10 in the diameter-reducing direction.

In the case where the engaging portion 13 has a concave shape and the engaged portion 14 has a convex shape as described in FIG. 9, the winding direction of the metal wire 11 may be reversed. In this case, the angle β1 of the first engaging surface 13A with respect to the winding direction of the metal wire 11 is configured to be larger than the angle β2 of the second engaging surface 13B with respect to the winding direction of the metal wire 11 . That is, with respect to the first engaging surface 13A, the angle β2 of the second engaging surface 13B located on the distal side in the direction in which the metal wire 11 is pulled toward the proximal side by the rotation of the coil body 10 along the arrow R2 is smaller than the angle β1 of the first engaging surface 13A. The winding direction of the metal wire 11 is the direction along the dashed line L2 in FIG. located on the side.

Reference Signs List 1, 21: Guide wire 2: Core wire 3: Distal tip 4: Hollow shaft 10, 30: Coiled body 11: Metal wire 12: Gap 13, 33: Engaging part 14, 34: Engaged part 15: First Part 16: Second part 31: Coil wire 32: Slit

Claims (9)

a core wire having a distal end and a proximal end;
a distal tip fixed to the distal end of the core wire;
a coil body composed of a helical coil wire, provided around the core wire, and having a distal end fixed to a proximal end of the distal tip;
a hollow shaft provided around the core wire, rotatable around the core wire, and having a distal end fixed to the proximal end of the coil body,
A gap is formed between a first portion on the proximal end side and a second portion on the distal end side of the coil wire adjacent to each other along the length direction of the core wire,
An engaging portion is provided on the second portion side of the first portion, and an engaged portion is provided on the first portion side of the second portion,
The coil body is configured such that the first portion and the second portion are relatively rotatable ,
The guide wire, wherein the engagement between the engaging portion and the engaged portion constitutes a ratchet mechanism that restricts the direction of rotation of the coil body to the direction of diameter reduction of the coil body. The guide wire according to claim 1 , wherein the engaging portion has a convex shape, the engaged portion has a concave shape, and the engaging portion has a shape corresponding to the shape of the engaged portion. The convex shape of the engaging portion is
a first engagement surface, and a second engagement surface located on the proximal end side in the length direction of the coil wire with respect to the first engagement surface,
3. The guidewire of claim 2 , wherein the angle of the first engagement surface with respect to the length of the coil wire is greater than the angle of the second engagement surface with respect to the length of the coil wire. The guide wire according to claim 1 , wherein the engaging portion has a concave shape, the engaged portion has a convex shape, and the engaging portion has a shape corresponding to the shape of the engaged portion. The concave shape of the engaging portion is
a first engagement surface, and a second engagement surface located on the distal end side in the length direction of the coil wire with respect to the first engagement surface,
5. The guidewire of claim 4 , wherein the angle of the first engagement surface with respect to the length of the coil wire is greater than the angle of the second engagement surface with respect to the length of the coil wire. The guide wire according to any one of claims 1 to 5 , wherein a plurality of the engaging portions and the engaged portions are provided along the length direction of the coil wire. The plurality of engaging portions are provided at regular intervals along the length direction of the coil wire, and the plurality of engaged portions are provided at regular intervals. guide wire. The guide wire according to any one of claims 1 to 7 , wherein the spiral coil wire is configured by spirally winding a wire. The guide wire according to any one of claims 1 to 7 , wherein the spiral coil wire is formed by forming a slit in a cylindrical pipe.

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