JP2022190427A - guide wire - Google Patents

Abstract

To inhibit the formation of a step and the making of a rigid gap in a connection, in a guide wire comprising the connection in which a plurality of core shafts are connected together by a tubular element.SOLUTION: A guide wire comprises: a first core shaft; a second core shaft that is provided on the side of a back end with respect to the first core shaft; a connection in which the back end of the first core shaft and the tip of the second core shaft are connected together; and a tubular element for covering the outer periphery of the connection. The tubular element has a deformation part capable of being expanded/contracted in an axial direction. The overall length of the tubular element can be adjusted by the expansion/contraction of the deformation part.SELECTED DRAWING: Figure 1

Description

The present invention relates to guidewires.

2. Description of the Related Art Conventionally, a guide wire is known which is used by inserting it into a body lumen in advance in order to place a medical device such as a catheter at a predetermined position in the body. Regarding this guide wire, one in which two core shafts are connected via a tubular member is known. When the ends of the two core shafts are covered with a tubular member, the outer diameter of the covered part becomes larger than that of the other parts, which causes a step on the outer surface of the guide wire, and the rigidity of the covered part is also a problem. There is a problem that the rigidity of the guide wire is greater than the rigidity of the portion of the guide wire, and a rigidity gap is generated. Therefore, Patent Literature 1 discloses a guide wire in which the portion of the core shaft that is covered by the tubular member has a smaller outer diameter than the portion that is not covered.

JP 2018-57767

However, even with the above-described prior art, there is still room for improvement in the technique of suppressing the occurrence of a step and a rigidity gap at the connecting portion in a guide wire having a connecting portion in which the ends of two core shafts are covered with a tubular member. There was room for For example, with the guide wire of Patent Document 1, it is not easy to match the total length of the reduced diameter portions (reduced diameter portions) at the ends of the two core shafts with the length of the tubular member. If the total length of the reduced diameter portion is greater than the length of the tubular member, there will be a portion not covered by the tubular member on the proximal end side of the reduced diameter portion, and a step will occur on the surface of the guidewire at this portion. On the other hand, if the total length of the reduced-diameter portion is smaller than the length of the tubular member, when the reduced-diameter portion is covered with the tubular member, the ends of the two core shafts are not connected to form a space between them. and the stiffness of the guidewire is relatively small at this portion. Further, when the diameter-reduced portion is covered with a tubular member while the core shaft ends are connected, the tubular member extends beyond the base end of the diameter-reduced portion to cover the portion other than the diameter-reduced portion of the core shaft. and the rigidity of that portion is relatively higher than that of other portions.

SUMMARY OF THE INVENTION An object of the present invention is to suppress the generation of a step and a rigidity gap in a guide wire having a connecting portion in which a plurality of core shafts are connected by a tubular member.

The present invention has been made to solve at least part of the above problems, and can be implemented as the following modes.

(1) According to the configuration of the invention described in claim 1, the guide wire includes the first core shaft, the second core shaft provided on the rear end side of the first core shaft, and the rear end of the first core shaft. It has a connection portion to which the end portion and the tip portion of the second core shaft are connected, and a tubular member that covers the outer circumference of the connection portion, and the tubular member has a deformable portion that can expand and contract in the axial direction. The overall length of the tubular member can be adjusted by expanding and contracting the deformable portion. According to this configuration, by adjusting the length of the tubular member, it is possible to easily adjust the length of the portion of the first core shaft and the second core shaft whose outer circumference is covered with the tubular member. can. As a result, it is possible to suppress the occurrence of a step and the occurrence of a rigidity gap at the connecting portion where a plurality of core shafts are connected by a tubular member.

(2) In the guidewire of the above configuration, the deformable portion has a gap portion whose width in the axial direction can be changed, and the length in the axial direction can be changed by changing the width of the gap portion. As a result, the deformation amount in the radial direction when the deformation portion deforms in the axial direction can be reduced. Therefore, even when the deformable portion is deformed in the axial direction, it becomes easy to keep the outer diameter of the guidewire constant at the connection portion, thereby improving the insertability of the guidewire into a narrow body lumen.

(3) In the above-described guidewire, the deformable portion is a coil. As a result, the coil expands and contracts in the axial direction, so that the axial length of the deformation portion can be changed. Due to the coil mechanism, the deformable portion is improved in durability against repeated loads in the axial direction and in resilience (elasticity).

(4) In the guidewire of the above configuration, the deformation section has a spiral cut, and the length in the axial direction can be changed by changing the width of the cut. Thereby, the length of the deformation portion in the axial direction can be changed by changing the width of the spiral cut of the deformation portion. The deformation portion has improved durability against repeated loads in the axial direction and resilience (elasticity) due to a mechanism having a spiral cut.

(5) In the guide wire of the above aspect, the rear end portion of the first core shaft includes a first small diameter portion having an outer diameter smaller than that of other portions of the first core shaft, and the first small diameter portion and the first core shaft. A first stepped portion is formed between the other portion of the second core shaft, and a second small diameter portion having a smaller outer diameter than the other portion of the second core shaft and a second A second stepped portion is formed between the small diameter portion and the other portion of the second core shaft, and the length of the tubular member when extended in the axial direction is the length of the first small diameter portion and the second small diameter portion. The length is greater than the total length, and the length when the tubular member is contracted in the axial direction is less than the total length. Accordingly, by having the first small-diameter portion and the second small-diameter portion, it is possible to suppress a local increase in the outer diameter of the guidewire at the connecting portion. In addition, by covering the entire outer periphery of the first small diameter portion and the second small diameter portion with the tubular member, stress concentration at the connecting portion is suppressed, and the possibility of kinking of the members constituting the connecting portion is suppressed. can be reduced.

(6) In the guidewire of the above aspect, one end of the tubular member is engaged with the first stepped portion, and the other end of the tubular member is engaged with the second stepped portion. As a result, the pressing force applied to the second core shaft and the force such as the rotational force can be efficiently transmitted to the first core shaft.

(7) In the guidewire of the above aspect, the tubular member has a main body portion with greater bending rigidity than that of the deformable portion. If the entire tubular member is formed of a deformed portion with low bending rigidity, there is a possibility that the force such as the pushing force or the rotational force will be attenuated in the deformed portion when the guide wire is bent. According to this configuration, since the tubular member has the main body portion, it is possible to reduce the attenuation of forces such as pushing force and rotational force at the connection portion when the guidewire is bent.

(8) In the guidewire of the above aspect, the rear end portion of the first core shaft and the front end portion of the second core shaft are provided with opposing surfaces facing each other, and the body portion is configured to face the first core shaft. It covers both opposing faces of the second core shaft. As a result, the main body has a portion where the facing surface of the first core shaft and the facing surface of the second core shaft abut, and between the facing surface of the first core shaft and the facing surface of the second core shaft. The gap around the resulting gap can be covered. By covering the facing surfaces of both the first core shaft and the second core shaft with the body portion, it is possible to reinforce the portion of the connecting portion where the strength of the guide wire is low.

(9) In the guidewire of the above configuration, the bending rigidity of the first core shaft is smaller than the bending rigidity of the second core shaft, the body portion covers the outer periphery of the first core shaft, and the deformation portion is the second core shaft. cover the perimeter of As a result, since the bending rigidity of the first core shaft is smaller than that of the second core shaft, it is possible to manufacture a guide wire having higher flexibility toward the distal end. Furthermore, by covering the outer circumference of the first core shaft with low bending rigidity with the main body and covering the outer circumference of the second core shaft with high bending rigidity with the deformation section, , the bending rigidity difference in the axial direction can be reduced. Therefore, it is possible to reduce the concentration of stress on the connecting portion between the first core shaft and the second core shaft, and reduce the possibility that the members forming the connecting portion will be kinked.

(10) In the guidewire of the above aspect, the tubular member, the first core shaft, and the second core shaft are connected with an adhesive, and the adhesive is attached to the first core shaft inside the tubular member. It is provided between the rear end portion and the front end portion of the second core shaft. As a result, the adhesive is fixed near the rear end portion of the first core shaft and the front end portion of the second core shaft, so that forces such as pushing force and rotational force applied to the second core shaft can be eliminated. , can be transmitted to the first core shaft via an adhesive.

The present invention can be implemented in various forms, for example, in the form of a guidewire, a guidewire manufacturing method, a catheter manufacturing method, an endoscope, a dilator, and the like.

1 is an explanatory diagram illustrating the overall configuration of a guidewire according to a first embodiment; FIG. 1 is an explanatory diagram illustrating a longitudinal section of the overall configuration of a guidewire according to a first embodiment; FIG. FIG. 4 is an explanatory diagram illustrating a connecting portion of the guidewire of the first embodiment; FIG. 4 is an explanatory diagram illustrating a longitudinal section of a connection portion of the guidewire of the first embodiment; It is explanatory drawing which illustrated the manufacturing method of the guide wire of 1st Embodiment. It is explanatory drawing which illustrated the manufacturing method of the guide wire of 1st Embodiment. FIG. 11 is an explanatory diagram illustrating a connecting portion of a guidewire according to a second embodiment; FIG. 11 is an explanatory diagram illustrating a longitudinal section of a connection portion of a guidewire according to a second embodiment; FIG. 11 is an explanatory diagram illustrating a connecting portion of a guidewire according to a third embodiment; FIG. 11 is an explanatory diagram illustrating a longitudinal section of a connection portion of a guidewire according to a third embodiment; FIG. 11 is an explanatory diagram illustrating a connecting portion of a guidewire according to a fourth embodiment; FIG. 11 is an explanatory diagram illustrating a vertical cross section of a connection portion of a guidewire according to a fourth embodiment; FIG. 11 is an explanatory diagram illustrating a connecting portion of a guidewire according to a fifth embodiment; FIG. 11 is an explanatory diagram illustrating a longitudinal section of a connection portion of a guidewire according to a fifth embodiment; FIG. 12 is an explanatory diagram illustrating a connecting portion of a guidewire according to a sixth embodiment; FIG. 11 is an explanatory diagram illustrating a vertical cross section of a connection portion of a guidewire according to a sixth embodiment; FIG. 20 is an explanatory diagram illustrating a longitudinal section of a connecting portion of a guidewire according to a seventh embodiment; FIG. 10 is an explanatory diagram illustrating a vertical cross-section of the overall configuration of a conventional guidewire; FIG. 10 is an explanatory diagram illustrating a longitudinal section of a connecting portion of a conventional guidewire; FIG. 10 is an explanatory diagram illustrating a longitudinal section of a connecting portion of a conventional guidewire;

A guide wire is a medical instrument that is inserted into a blood vessel or digestive organ by a doctor or the like and used for treatment or examination.

1 to 13 are referred to as the "distal side" of the guidewire and each component of the guidewire of the present invention, and the right side as the "posterior side" of the guidewire and each component. . The distal end of the guidewire is the side that is inserted into the body before the guidewire is inserted into the body, and the rearward end of the guidewire is the side that is operated by an operator such as a doctor (proximal). side). In addition, the end located on the distal side of the guide wire and each component of the guide wire is referred to as the "tip", and the part including the "tip" and extending halfway toward the rear end from the tip is the "tip". and described. Similarly, the end located on the rear end side of the guide wire and each component member of the guide wire is referred to as the "rear end", and the portion including the "rear end" and extending halfway from the rear end toward the distal side is Described as "rear end".

The left-right direction in each of FIGS. 1 to 13 is referred to as the axial direction of the guide wire and each constituent member of the guide wire. Also, the direction orthogonal to the axial direction is called the radial direction of the guide wire and each component of the guide wire.

1 to 13, for convenience of explanation, there are portions in which the relative size ratios of the guide wire and the components of the guide wire are described in relative ratios different from the actual ones.

<First embodiment>
FIG. 1 is an explanatory diagram illustrating the overall configuration of the guidewire 1A of the first embodiment. FIG. 2 is an explanatory diagram illustrating a longitudinal section of the overall configuration of the guidewire 1A of the first embodiment. FIG. 3A is an explanatory diagram illustrating the connection portion 3 of the guidewire 1A of the first embodiment. FIG. 3B is an explanatory diagram illustrating a longitudinal section of the connection portion 3 of the guidewire 1A of the first embodiment.

The guide wire 1A is a medical device that is used by being inserted into a body lumen in advance in order to place a catheter or the like at a predetermined position in the body. It has a coil 30 and a tubular member 50A. The distal end portion 2 of the guidewire 1A is composed of a first core shaft 10A and a distal coil 30 covering the outer circumference of the first core shaft 10A. A connecting portion 3 of the guide wire 1A is composed of a first core shaft 10A, a second core shaft 20A, and a tubular member 50A. The tubular member 50A covers the outer periphery of the rear end portion of the first core shaft 10A and the outer periphery of the distal end portion of the second core shaft 20A. The first core shaft 10A and the second core shaft 20A are connected to the tubular member 50A by an adhesive 60 or the like. A rear end portion 4 of the guide wire 1A is configured by a second core shaft 20A.

The first core shaft 10A is an elongated member with a circular cross section. The first core shaft 10A has the thinnest distal end of the first core shaft 10A and the thickest rear end of the first core shaft 10A. Between the front end and the rear end, there is a tapered portion in which the outer diameter becomes smaller toward the front end. In other words, the cross-sectional area of the first core shaft 10A is the largest at the rear end, gradually decreases toward the distal end at the tapered portion, and is smallest at the distal end. This makes it possible to fabricate the guide wire 1A having higher flexibility toward the distal end. The first core shaft 10A has, at its distal end, a portion whose outer diameter is substantially constant in the axial direction. The distal end portion of the first core shaft 10A and part of the tapered portion are disposed inside the distal coil 30 . A portion of the rear end portion of the first core shaft 10A is arranged inside the tubular member 50A.

As shown in FIG. 3B, the first core shaft 10A has a first small diameter portion 11 at its rear end. The outer diameter of the first small diameter portion 11 is smaller than the outer diameter of the rest of the first core shaft 10A. An adhesive 60 is filled between the first small diameter portion 11 and the inner peripheral surface 51 of the tubular member 50A. The first small diameter portion 11 and the tubular member 50A are connected by an adhesive 60. As shown in FIG. The first core shaft 10A has a first stepped portion 12 at its rear end. The first stepped portion 12 is a portion formed by the difference in outer diameter between the first small diameter portion 11 and the rest of the rear end portion of the first core shaft 10A. The first stepped portion 12 is formed such that the outer diameter gradually increases from the first small diameter portion 11 toward the rest of the first core shaft 10A. As a result, sudden changes in rigidity at the first stepped portion 12 can be suppressed. The outer diameter of the tubular member 50A is the same as the outer diameter of the stepped portion 12 or smaller than the outer diameter of the stepped portion 12 . A distal end portion of the tubular member 50A is connected to the first core shaft 10A while being in contact with the first stepped portion 12 . In other words, the distal end portion of the deformation portion 54A is connected to the first core shaft 10A while being in contact with the first stepped portion 12. As shown in FIG.

The second core shaft 20A is an elongated member with a circular cross section. The second core shaft 20A has the thinnest distal end of the second core shaft 20A and the thickest rear end of the second core shaft 20A. Between the front end and the rear end, there is a tapered portion in which the outer diameter becomes smaller toward the front end. In other words, the cross-sectional area of the second core shaft 20A is the largest at the rear end, gradually decreases toward the distal end at the tapered portion, and is smallest at the distal end. This makes it possible to fabricate the guide wire 1A having higher flexibility toward the distal end. The distal end portion of the second core shaft 20A has a portion whose outer diameter is substantially constant in the axial direction. A portion of the distal end portion of the second core shaft 20A is arranged inside the tubular member 50A.

The second core shaft 20A has a second small diameter portion 21 at its distal end. The outer diameter of the second small diameter portion 21 is smaller than the outer diameter of other portions of the second core shaft 20A. An adhesive 60 is filled between the second small diameter portion 21 and the inner peripheral surface 51 of the tubular member 50A. The second small diameter portion 21 and the tubular member 50A are connected by an adhesive 60. As shown in FIG. As a result, a pushing force applied to the second core shaft 20A for manipulating the guide wire 1A, a force such as a rotational force, etc. can be transmitted to the first core shaft 10A via the adhesive 60. FIG. The second core shaft 20A has a second stepped portion 22 at its distal end. The second stepped portion 22 is a portion formed by the difference in outer diameter between the second small diameter portion 21 and the other portion of the distal end portion of the second core shaft 20A. The second stepped portion 22 is formed such that the outer diameter gradually increases from the second small diameter portion 12 toward the rest of the second core shaft 20A. As a result, sudden changes in rigidity at the second stepped portion 22 can be suppressed. A rear end portion of the tubular member 50A is connected to the second core shaft 20A while being in contact with the second stepped portion 22 . In other words, the rear end portion of the body portion 53A is connected to the second core shaft 20A while being in contact with the second stepped portion 22 .

Inside the tubular member 50A, the rear end surface of the first core shaft 10A and the front end surface of the second core shaft 20A are arranged to face each other. The end surface of the first core shaft 10A that faces the tip of the second core shaft 20A is defined as a first opposing surface 13. As shown in FIG. The end surface of the second core shaft 20A facing the rear end of the first core shaft 10A is defined as a second facing surface 23. As shown in FIG. The first facing surface 13 and the second facing surface 23 are in contact with each other. The position in the axial direction where the rear end portion of the first core shaft 10A and the front end portion of the second core shaft 20A are in contact is approximately the same as the position of the connecting portion between the main body portion 53A and the deformation portion 54A. be.

As shown in FIGS. 1 and 2, the distal coil 30 is a cylindrical member formed by spirally winding a strand of wire continuously in the axial direction. The distal end of the distal coil 30 is connected to the distal end of the first core shaft 10A. A tip connection portion 31 is a portion where the tip portion of the tip-side coil 30 and the tip portion of the first core shaft 10A are connected. A rear end portion of the distal coil 30 is connected to a tapered portion of the first core shaft 10A. A rear end connecting portion 32 is a portion where the rear end portion of the distal coil 30 and the tapered portion are connected. The front end connection portion 31 and the rear end connection portion 32 are formed of metal solder such as silver brazing, gold brazing, zinc, Sn--Ag alloy, Au--Sn alloy.

The tubular member 50A is a cylindrical member extending in the axial direction and includes a body portion 53A and a deformation portion 54A. The thickness of the tubular member 50A is substantially constant in the axial direction. The tubular member 50A has an outer diameter at the rear end of the first core shaft 10A and an inner diameter larger than the outer diameter at the front end of the second core shaft 20A. The inner diameter of the tubular member 50A is substantially constant in the axial direction. The tubular member 50A covers the outer circumference of the rear end of the first core shaft 10A and the outer circumference of the front end of the second core shaft 20A. At least the rear end of the first core shaft 10A and the front end of the second core shaft 20A are arranged inside the tubular member 50A.

The body portion 53A is a portion that constitutes the rear end portion of the tubular member 50A. The main body portion 53A covers the outer circumference of the distal end portion of the second core shaft 20A. The body portion 53A is a cylindrical member extending in the axial direction. The body portion 53A has a substantially constant thickness in the axial direction. The body portion 53A has an inner diameter larger than the outer diameter of the rear end portion of the first core shaft 10A and the outer diameter of the front end portion of the second core shaft 20A. A distal end portion of the body portion 53A is connected to a rear end portion of the deformation portion 54A. The main body portion 53A is defined by a relative elastic modulus comparison with the deformation portion 54A. 53 A of main-body parts are parts which have a larger elastic modulus than 54 A of deformation parts. A metal material, for example, can be used for the body portion 53A. For example, a NiTi alloy or a NiTi-based alloy is used as the metal material. Alternatively, martensitic stainless steel, ferritic stainless steel, precipitation hardening stainless steel, austenitic stainless steel and the like can be used.

54 A of deformation|transformation parts are parts which comprise the front-end|tip part of 50 A of tubular members. The deformation portion 54A covers the outer periphery of the rear end portion of the first core shaft 10A. The deformation portion 54A has an inner diameter larger than the outer diameter of the rear end portion of the first core shaft 10A and the outer diameter of the front end portion of the second core shaft 20A. A rear end portion of the deformation portion 54A is connected to a front end portion of the main body portion 53A. The deformation portion 54A is defined by a relative comparison of the modulus of elasticity with the body portion 53A. 54 A of deformation|transformation parts are parts which have an elastic modulus smaller than 53 A of main-body parts. 54 A of deformation|transformation parts can be expanded-contracted in an axial direction. This makes it easy to adjust the lengths of the portions of the first core shaft 10A and the second core shaft 20A whose outer peripheries are covered with the tubular members. Here, being able to expand and contract in the axial direction means that when an external force is applied to the deformable portion 54A in the axial direction, the length of the deformable portion 54A in the axial direction decreases, and when the external force is released, the length of the deformable portion 54A decreases. Second, it means that the axial length of the deformation portion 54A returns to the length before the external force is applied. The deformable portion 54A deforms more than the main body portion 53A due to an external force or the like applied in the general use of the guide wire 1A. When it is removed, a force acts to return it to its original shape.

In the present embodiment, the deformation portion 54A is a coil formed by spirally winding the wire 56A continuously in the axial direction. 54 A of deformation|transformation parts have 55 A of void parts between 56 A of strands wound continuously in the axial direction. The deformable portion 54A can expand and contract in the axial direction when an external force or the like is applied to the deformable portion 54A. For example, when a tensile force in the axial direction is applied to the deformed portion 54A, the deformed portion 54A extends in the axial direction as the pitch of the wires 56A expands and the width of the gap 55A expands. Alternatively, when an axial compressive force is applied to the deformable portion 54A, the deformable portion 54A shrinks in the axial direction as the pitch of the wires 56A shrinks and the width of the gap 55A shrinks.

For example, if the deformable portion 54A does not have the void portion 55A, the axial expansion and contraction of the deformable portion 54A may be accompanied by radial deformation. However, in the case of a structure having a gap 55A in the axial direction, such as the deformable portion 54A, the width of the gap 55A changes when deformed in the axial direction, thereby reducing the amount of radial deformation. can be done. Therefore, even when the deformable portion 54A is deformed in the axial direction, it becomes easy to keep the outer diameter of the guidewire 1A at the connecting portion 3 constant, and the insertability of the guidewire 1A into a narrow body lumen is improved. In addition, the deformable portion 54A has improved durability against repeated loads in the axial direction and resilience (elasticity) due to the coil mechanism.

In this embodiment, the deformable portion 54A is a coil, but the deformable portion 54A may have a structure other than a coil as long as it can expand and contract in the axial direction. For example, the deformable portion 54A may be a tube made of a rubber material such as natural rubber or synthetic rubber. Synthetic rubbers include, for example, acrylic rubber, acrylonitrile-butadiene rubber, hydrogenated acrylonitrile-butadiene rubber, isoprene rubber, urethane rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber (EPDM), chloroprene rubber, silicone rubber, styrene-butadiene rubber, polysulfide rubber, butadiene rubber, fluororubber, and the like. Also, the deformable portion 54A may be a tube made of a thermosetting resin, a thermoplastic resin, or a thermoplastic elastomer. Examples of these resin materials include thermosetting resins such as polyimide, phenol resin, and melamine resin, and thermoplastic resins such as polyamide resin, polyurethane resin, polyethylene resin, polyvinyl chloride resin, and polyester resin. Examples of thermoplastic elastomers include polyamide elastomers, polyurethane elastomers, and polyester elastomers.

<Manufacturing method of the first embodiment>
FIG. 4A is an explanatory diagram illustrating the method of manufacturing the guidewire 1A of the first embodiment. FIG. 4A is a view before connecting the rear end of the first core shaft 10A and the front end of the second core shaft 20A. FIG. 4B is an explanatory diagram illustrating the method for manufacturing the guidewire 1A of the first embodiment. FIG. 4B is a diagram after the rear end of the first core shaft 10A and the front end of the second core shaft 20A are connected. The connecting portion 3 is produced by the following steps. First, the adhesive 60 is filled inside the tubular member 50A. Next, the first core shaft 10A is inserted from one side of the tubular member 50A into the deformation portion 54A, and the first stepped portion 12 is brought into contact with the distal end portion of the deformation portion 54A. After that, the second core shaft 20A is inserted from the other end of the tubular member 50A into the body portion 53A, and the second stepped portion 22 is brought into contact with the rear end portion of the body portion 53A. After that, by further moving the first core shaft 10A to the rear end side, the deformation portion 54A is axially contracted. The adhesive 60 is cured while the first opposing surface 13 and the second opposing surface 23 are in contact with each other.

By fabricating the connecting portion 3 through the above steps, the tubular member 50A, the first core shaft 10A and the second core shaft 50A are connected to each other while the rear end portion of the first core shaft 10A and the front end portion of the second core shaft 20A are in contact with each other. A two-core shaft 20A can be connected. As a result, torque applied to the guidewire 1A by an operator such as a doctor can be transmitted to the distal end side of the guidewire 1 via the contact portion between the first core shaft 10A and the second core shaft 20A. One end of the tubular member 50A is engaged with the first stepped portion 12, and the other end of the tubular member 50A is engaged with the second stepped portion 22. As shown in FIG. As a result, the first core shaft 10A and the second core shaft 20A are engaged with each other through the tubular member 50A, so that the pressing force and the rotational force applied to the second core shaft 20A are It can be efficiently transmitted to the first core shaft 10A.

As shown in FIG. 4A, La is the length (natural length) of the tubular member 50A when no external force or the like is applied to the tubular member 50A. Also, the length of the first small diameter portion 11 is L1, and the length of the second small diameter portion 21 is L2. Also, as shown in FIG. 4B, Lt is the total length of the length L1 of the first small diameter portion 11 and the length L2 of the second small diameter portion 21 . Expressed by a formula, L1+L2=Lt. At this time, the length La of the tubular member 50A is longer than the total length Lt of the length L1 of the first small diameter portion 11 and the length L2 of the second small diameter portion 21 . Expressing this relationship in a mathematical formula, La≧Lt. Therefore, when the connection portion 3 is manufactured in a state where the rear end portion of the first core shaft 10A and the front end portion of the second core shaft 20A are in contact with each other, the outer circumferences of the first small diameter portion 11 and the second small diameter portion 21 All are covered by tubular member 50A. For example, when the outer peripheries of the first small diameter portion 11 and the second small diameter portion 21 are not entirely covered by the tubular member 50A, the portion covered by the tubular member 50A and the portion not covered by the tubular member 50A , the bending rigidity of the guide wire 1A is different. As a result, there is a possibility that the members forming the connection portion 3 will be kinked due to the concentration of stress on the portion of the connection portion 3 where the flexural rigidity is low. By covering the entire outer peripheries of the first small diameter portion 11 and the second small diameter portion 21 with the tubular member 50A, it is possible to reduce the difference in bending rigidity at different positions in the axial direction in the connection portion 3, thereby 3 can be reduced.

Further, as shown in FIG. 4B, the tubular member 50A is engaged with the first stepped portion 12 and the second stepped portion 22. As shown in FIG. As a result, the tubular member 50A does not cover any portion of the first core shaft 10A or the second core shaft 20A other than the first small-diameter portion 11 and the second small-diameter portion 21, and the connection portion 3 suddenly It is possible to suppress the occurrence of locations where the bending rigidity is high. As shown in FIG. 4B , when the connection portion 3 is manufactured in a state where the first opposing surface 13 and the second opposing surface 23 are in contact with each other, the length of the tubular member 50A and the length of the first small diameter portion 11 L1 and the total length Lt of the length L2 of the second small diameter portion 21 are equal.

According to the guidewire 1A of the present embodiment described above, by adjusting the length of the tubular member 50A, the outer circumferences of the first core shaft 10A and the second core shaft 20A are covered with the tubular member 50A. You can easily adjust the length of the part. As a result, it becomes easy to suppress the occurrence of a step and the occurrence of a rigidity gap in the connecting portion 3 .

FIG. 11 is an explanatory diagram illustrating a vertical cross-section of the overall configuration of a conventional guidewire 1Z. FIG. 12 is an explanatory diagram illustrating a longitudinal section of the connection portion 3 of the conventional guide wire 1Z. FIG. 13 is an explanatory diagram illustrating a vertical cross-section of a connection portion 3 of a conventional guide wire 1Z. The conventional guide wire 1Z differs from the guide wire 1A of the present embodiment mainly in that the tubular member 50Z does not expand and contract in the axial direction.

The tubular member 50Z is configured to have a certain rigidity, and covers the outer periphery of the rear end of the first core shaft 10Z and the outer periphery of the distal end of the second core shaft 20Z. An adhesive 60 is filled inside the tubular member 50Z. The first core shaft 10Z has a first low-rigidity portion 100Z at its rear end. The first low-rigidity portion 100Z is a portion of the first core shaft 10Z that has lower bending rigidity than other portions. The second core shaft 20Z has a second low-rigidity portion 200Z at its distal end. The second low-rigidity portion 200Z is a portion of the second core shaft 20Z that has lower bending rigidity than other portions. The first low-rigidity portion 100Z and the second low-rigidity portion 200Z may be configured such that the flexural rigidity becomes smaller than that of other portions by reducing the diameter.

When the sum of the rigidity of the first low-rigidity portion 100Z and the second low-rigidity portion 200Z and the rigidity of the tubular member 50Z is close to the rigidity of the other portion of the core shaft, the first low-rigidity portion 100Z and the second low-rigidity portion If the total length of 200Z matches the length of the tubular member 50Z, generation of a rigid gap in the connecting portion 3 is suppressed. However, as shown in FIGS. 11 and 12, when the length of the tubular member 50Z is longer than the sum of the lengths of the first low-rigidity portion 100Z and the second low-rigidity portion 200Z, the tubular member 50Z is the first It also covers the outer periphery of portions other than the first low-rigidity portion 100Z and the second low-rigidity portion 200Z. As a result, of the portion of the first core shaft 10Z and the portion of the second core shaft 20Z covered by the tubular member 50Z, the portions other than the first low-rigidity portion 100Z and the second low-rigidity portion 200Z are The bending stiffness rises abruptly, creating a stiffness gap. Further, if the first low-rigidity portion 100Z and the second low-rigidity portion 200Z are not connected inside the tubular member 50Z, the portion of the tubular member 50Z where the core shafts 10Z and 20Z are not arranged inside is Rigidity is relatively low compared to other parts, and a rigidity gap is generated.

On the other hand, as shown in FIG. 13, when the length of the tubular member 50Z is shorter than the sum of the lengths of the first low-rigidity portion 100Z and the second low-rigidity portion 200Z, the tubular member 50Z has the first low-rigidity portion. The entire portion 100Z and the second low-rigidity portion 200Z cannot be covered. Therefore, in the portions of the first low-rigidity portion 100Z and the second low-rigidity portion 200Z that are not covered with the tubular member 50Z, the bending rigidity of the guide wire 1Z abruptly decreases, creating a rigidity gap. As described above, in the conventional guide wire 1Z, it is difficult to reduce the difference in bending rigidity in the axial direction at the connecting portion 50Z.

On the other hand, according to the guidewire 1A of the present embodiment, by adjusting the length of the tubular member 50A, the length of the tubular member 50A can be changed between the first small diameter portion 11 of the first core shaft 10A and the length of the second core shaft 10A. It can be matched with the total length of the second small diameter portion 21 of 20A. As a result, the tubular member 50A may cover portions other than the first small diameter portion 11 and the second small diameter portion 21, and the portions of the first small diameter portion 11 and the second small diameter portion 21 which are not covered by the tubular member 50A may be prevented. can be suppressed. As a result, it is possible to suppress the generation of steps and rigidity gaps in the connection portion 3 .

<Second embodiment>
FIG. 5A is an explanatory diagram illustrating the connection portion 3 of the guidewire 1B of the second embodiment. FIG. 5B is an explanatory diagram illustrating a vertical cross section of the connection portion 3 of the guidewire 1B of the second embodiment. The guidewire 1B has a tubular member 50B. The tubular member 50B has a body portion 53B. The guidewire 1B differs from the guidewire 1A of the first embodiment in that it has a tubular member 50B. The tubular member 50B is different from the tubular member 50A in that the flexural rigidity of the body portion 53B is defined to be greater than the flexural rigidity of the deformation portion 54B. Members other than the tubular member 50B among the members constituting the guide wire 1B are common to the guide wire 1A of the first embodiment.

The body portion 53B is defined by a relative bending stiffness comparison with the deformation portion 54B. The body portion 53B is a portion having greater bending rigidity than the deformation portion 54B. A metal material, for example, can be used for the body portion 53B. Examples of metal materials include NiTi alloys, martensitic stainless steels, ferritic stainless steels, precipitation hardening stainless steels, austenitic stainless steels, and the like. The length of the body portion 53B is longer than the length of the deformation portion 54B after being connected to the first core shaft 10A. Both the first facing surface 13 and the second facing surface 23 are arranged inside the body portion 53B. In other words, the body portion 53B covers a portion where the facing surface 13 of the first core shaft 10A and the facing surface 23 of the second core shaft 20A abut.

For example, in the case where the entire tubular member 50B is formed of the deformable portion 54B with low bending rigidity, when the guidewire 1B is bent, the pushing force applied to the deformable portion 54B to operate the guidewire 1B, Attenuation of forces such as rotational forces may occur. According to this configuration, since the tubular member 50B has the main body portion 53B with high flexural rigidity, it is possible to reduce attenuation of forces such as pushing force and rotational force. In addition, since the main body portion 53B covers the portion where the facing surface 13 of the first core shaft 10A and the facing surface 23 of the second core shaft 20A abut against each other, the portion where the strength of the connecting portion 3 is low is covered by the main body portion 53B. can be reinforced by

According to the guidewire 1B of the present embodiment described above, in the tubular member 50B, the length ratio of the deformation portion 54B and the main body portion 53B can be set arbitrarily. However, it is preferable for the main body portion 53B to be longer than the deformable portion 54B, because the rigidity of the tubular member 50B can be increased.

<Third Embodiment>
FIG. 6A is an explanatory diagram illustrating the connection portion 3 of the guidewire 1C of the third embodiment. FIG. 6B is an explanatory diagram illustrating a vertical cross section of the connecting portion 3 of the guidewire 1C of the third embodiment. The guidewire 1C has a tubular member 50C. The guidewire 1C differs from the guidewire 1B of the second embodiment in that it has a tubular member 50C. The tubular member 50B of the second embodiment differs from the tubular member 50C in the arrangement of the deformation portion and the main body portion. Specifically, in the tubular member 50B, the deformation portion 54B is provided on the distal end side, and the body portion 53B is provided on the rear end side. On the other hand, in the tubular member 50C, the deformation portion 54C is provided on the rear end side, and the body portion 53C is provided on the front end side. The configuration of the guide wire 1C is the same as that of the guide wire 1B of the second embodiment except for the arrangement of the deformation portion and the main body.

The deformation portion 54C covers the outer circumference of the second core shaft 20A. Both the first facing surface 13 and the second facing surface 23 are arranged inside the body portion 53C.

For example, the bending rigidity 10A of the first core shaft 10A may be smaller than the bending rigidity of the second core shaft 20A. In such a case, the body portion 53C covers the outer periphery of the first core shaft 10A with low bending rigidity, and the deformation portion 54C covers the outer periphery of the second core shaft 20A with high bending rigidity. The directional bending stiffness difference can be reduced. Therefore, it is possible to reduce the occurrence of stress concentration in the connecting portion 3, and reduce the possibility of the members forming the connecting portion 3 being kink.

According to the guidewire 1C of the present embodiment described above, in the tubular member 50C, either the deformable portion 54C or the body portion 53C may be positioned on the distal end side or the rear end side. When the body portion 53C is provided on the distal end side, it is possible to fabricate a guide wire 1C that is more flexible on the distal end side. In either case, by adjusting the length of the tubular member 50C, the length of the portion of the first core shaft 10A and the second core shaft 20A whose outer circumference is covered by the tubular member 50C can be adjusted. Can be easily adjusted.

<Fourth Embodiment>
FIG. 7A is an explanatory diagram illustrating the connection portion 3 of the guidewire 1D of the fourth embodiment. FIG. 7B is an explanatory diagram illustrating a vertical cross section of the connecting portion 3 of the guide wire 1D of the fourth embodiment. The guidewire 1D has a tubular member 50D. The guidewire 1D differs from the guidewire 1A of the first embodiment in that it has a tubular member 50D. Among the members constituting the guide wire 1D, members other than the tubular member 50D are common to the guide wire 1A of the first embodiment.

The tubular member 50D has a deformation portion 54D. The deformation portion 54D is a slit pipe in which a spiral cut is provided continuously in the axial direction in a cylindrical member. The deformed portion 54D has a linear portion 57 formed by providing a cut continuously in its axial direction. A notch provided in the deformation portion 54D is defined as a gap portion 55D. The deformable portion 54D can expand and contract in the axial direction when an external force or the like is applied to the deformable portion 54D. For example, when a tensile force in the axial direction is applied to the deformable portion 54D, the linear portions 57 of the deformable portion 54D expand in pitch and the width of the gap portion 55D expands, thereby extending the deformable portion 54D in the axial direction. Alternatively, when an axial compressive force is applied to the deformable portion 54D, the deformable portion 54D shrinks in the axial direction as the pitch of the linear portions 57 shrinks and the width of the gap 55D shrinks.

For example, if the deformation portion 54D does not have the void 55D, the deformation in the radial direction may be accompanied when the deformation portion 54D expands and contracts in the axial direction. However, in the case of a structure having a space 55D in the axial direction, such as the deformable portion 54D, the width of the space 55D changes when deformed in the axial direction, thereby reducing the amount of radial deformation. can be done. Therefore, even when the tubular member 50D is deformed in the axial direction, the outer diameter of the guide wire 1D at the connection portion 3 can be easily kept constant, improving the insertability of the guide wire 1D into a narrow body lumen. In addition, the deformable portion 54D is excellent in durability against repeated loads in the axial direction and in resilience (elasticity) due to a mechanism having a spiral cut.

According to the guide wire 1D of the present embodiment described above, the deformable portion 54D of the tubular member 50D is not limited to a coil as long as it has an extendable structure. As in this embodiment, it may be a slit pipe having a gap whose width in the longitudinal direction can be changed.

<Fifth Embodiment>
FIG. 8A is an explanatory diagram illustrating the connecting portion 3 of the guidewire 1E of the fifth embodiment. FIG. 8B is an explanatory diagram illustrating a longitudinal section of the connection portion 3 of the guidewire 1E of the fifth embodiment. The guidewire 1E has a tubular member 50E. The guidewire 1E differs from the guidewire 1E of the first embodiment in that it has a deformed portion 54E. Of the members constituting the guidewire 1E, members other than the deformable portion 54E are common to the guidewire 1A of the first embodiment.

The tubular member 50E has a deformation portion 54E. The deformable portion 54E is a cylindrical member that can expand and contract in the axial direction. The deformable portion 54E can be made to be stretchable in the axial direction by forming it from a relatively flexible and elastic material such as resin, for example. Alternatively, by forming the deformable portion 54E into a bellows shape, it can be manufactured so as to be stretchable in the axial direction.

According to the guidewire 1E of the present embodiment described above, the deformable portion 54E of the tubular member 50E is not limited to a member having a gap as long as it has an expandable structure. As in this embodiment, the tube may be made of a material whose width in the longitudinal direction can be changed.

<Sixth embodiment>
FIG. 9A is an explanatory diagram illustrating the connection portion 3 of the guide wire 1F of the sixth embodiment. FIG. 9B is an explanatory diagram illustrating a vertical cross section of the connecting portion 3 of the guide wire 1F of the sixth embodiment. The guidewire 1F has a first core shaft 10F and a second core shaft 20F. The guidewire 1F differs from the guidewire 1E of the fifth embodiment in that it has a first core shaft 10F and a second core shaft 20F. Among the members constituting the guide wire 1F, members other than the first core shaft 10F and the second core shaft 20F are common to the guide wire 1E of the fifth embodiment.

The first core shaft 10F does not have a portion corresponding to the stepped portion 12 of the first core shaft 10A. in short. The rear end portion of the first core shaft 10F has a straight shape with a constant outer diameter. The second core shaft 20F does not have a portion corresponding to the stepped portion 22 of the second core shaft 20A. in short. The tip of the second core shaft 20F has a straight shape with a constant outer diameter. The first core shaft 10F has, at its rear end, a low-rigidity portion 100F having lower rigidity than the rest of the first core shaft 10F. The second core shaft 20F has a low-rigidity portion 200F at its distal end, the rigidity of which is lower than that of other portions of the second core shaft 20F. Even in such a case, the connecting portion 3 can be produced by, for example, the following manufacturing method. First, the second core shaft 20F is inserted into the body portion 53A of the tubular member 50E, and the rear end portion of the low-rigidity portion 200F is aligned with the rear end portion of the body portion 53A. In this state, the body portion 53A and the second core shaft 20F are connected with an adhesive, brazing material, or the like. After that, the inside of the tubular member 50E is filled with the adhesive 60, and the first core shaft 10F is inserted inside the deformation portion 54E. By adjusting the length of the deformation portion 54E, the positions of the rear end portion of the low-rigidity portion 100F and the tip portion of the deformation portion 54E are aligned. After that, the adhesive 60 is cured, and the first core shaft 10F and the second core shaft 20F are connected via the tubular member 50E.

According to the guide wire 1F of the present embodiment described above, the first core shaft 10F and the second core shaft 20F do not have to have a stepped portion.

<Seventh embodiment>
FIG. 10 is an explanatory diagram illustrating the connection portion 3 of the guide wire 1G of the seventh embodiment. The guide wire 1G differs from the first to sixth embodiments in that the first core shaft 10G and the second core shaft 20G each have two stepped portions, inner and outer. Also, the guide wire 1G differs from the first to sixth embodiments in that it has two inner and outer tubular members that engage with the two inner and outer stepped portions. Among the members constituting the guide wire 1G, the structures other than the connecting portion 3 are common to the guide wire 1A of the first embodiment.

The guidewire 1G has a first core shaft 10G, a second core shaft 20G, an inner tubular member 80 and an outer tubular member 83. The first core shaft 10</b>G has an inner first small diameter portion 70 , an inner first stepped portion 71 , an outer first small diameter portion 72 , and an outer first stepped portion 73 . The second core shaft 20</b>G has an inner second small diameter portion 74 , an inner second stepped portion 75 , an outer second small diameter portion 76 and an outer second stepped portion 77 .

The inner tubular member 80 has an inner deformation portion 81 and an inner body portion 82 . Outer tubular member 83 has an outer deformation portion 84 and an outer body portion 85 . The inner deformation portion 81 engages with the inner first stepped portion 71 , and the inner main body portion 82 engages with the inner second stepped portion 75 . The outer deformation portion 84 engages with the outer first stepped portion 73 , and the outer body portion 85 engages with the outer second stepped portion 77 . The interior of the inner tubular member 80 and the interior of the outer tubular member 83 are filled with an adhesive 60 .

According to the guide wire 1G of this embodiment described above, the ends of the first core shaft 10G and the second core shaft 20G may be covered with two tubular members as in this embodiment. Since both of the two tubular members have the deformed portion, the length of the tubular member can be adjusted according to the length of the inner and outer small diameter portions.

<Modification 1>
The outer diameters of the first core shaft and the second core shaft are not limited to the configuration in which the outer diameters decrease toward the distal end side, and are designed to have appropriate sizes according to the functions required of the guidewire.

<Modification 2>
The distal coil may be a cylindrical member configured by spirally winding a plurality of wires continuously in the axial direction. The tip connection and rear connection may be formed by an adhesive such as an epoxy adhesive. The leading end connection and the trailing end connection may be made of different materials.

<Modification 3>
The first core shaft, second core shaft and tubular member may be connected by methods other than adhesive. For example, the distal end of the tubular member may be connected to the rear end of the first core shaft by brazing or welding, and the rear end of the tubular member may be connected to the distal end of the second core shaft by brazing or welding. . The tubular member need not be a cylindrical member and may be polygonal in cross section. The tubular member may not have a uniform thickness in the axial direction. For example, the thickness may decrease toward the distal side, in which case a guidewire that is more distally flexible can be made. Also, the inner diameter of the tubular member may not be substantially constant in the axial direction. All of the tubular members may be composed of deformed parts such as coils and slit pipes.

<Modification 4>
The deformation may constitute the rear end of the tubular member. The deformation portion may not be a cylindrical member, and may have a polygonal cross section. The thickness of the deformation portion may not be substantially constant in the axial direction, and for example, the thickness may decrease toward the distal end side. In this case, a guide wire with a more flexible distal end can be produced. Further, the deformable portion may be a cylindrical member configured by spirally winding a plurality of strands continuously in the axial direction. In the second embodiment, the body portion has a bending rigidity greater than that of the deformation portion, but the bending rigidity of the deformation portion may be greater than that of the body portion.

<Modification 5>
The body portion may constitute the distal end portion of the tubular member. The main body may not be a cylindrical member, and may have a polygonal cross section. The thickness of the main body portion may not be substantially constant in the axial direction, and for example, the thickness may decrease toward the distal end side. In this case, a guide wire with a more flexible distal end can be produced.

<Modification 6>
In the guidewire 1A of the first embodiment, the length (natural length) La of the tubular member 50A in a state where no external force or the like is applied to the tubular member 50A is equal to the length L1 of the first small diameter portion 11 and the length L1 of the second small diameter portion 11. The relationship that the total length L2 of the portion 21 is greater than the length Lt is the guidewire 1B of the second embodiment, the guidewire 1C of the third embodiment, the guidewire 1D of the fourth embodiment, and the guidewire 1D of the fourth embodiment. It is also applicable to each tubular member 50B, 50C, 50D, 50E of the guide wire 1E of the five embodiments. That is, the lengths of the tubular members 50B, 50C, 50D, and 50E corresponding to the length (natural length) La of the tubular member 50A when no external force or the like is applied to the tubular member 50A are Lb, Lc, and Ld, respectively. , Le, the lengths Lb, Lc, Ld, and Le are greater than the length Lt. Expressed by mathematical formulas, Lb, Lc, Ld, and Le≧Lt.

<Modification 7>
Both the first opposing surface and the second opposing surface may not be arranged inside the main body. For example, the body portion may constitute the distal end side of the tubular member, and only the first opposing surface may be arranged inside the body portion. Alternatively, the main body may constitute the rear end side of the tubular member, and only the second facing surface may be arranged inside the main body.

DESCRIPTION OF SYMBOLS 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1Z... Guide wire 2... Tip part of guide wire 3... Connection part 4... Rear end part of guide wire 10A, 10F, 10G, 10Z... First core shaft 11 First small diameter portion 12 First stepped portion 13 First opposing surface 20A, 20F, 20G, 20Z Second core shaft 21 Second small diameter portion 22 Second stepped portion 23 Second opposing surface 30 Tip Side coil 31 Front end connection part 32 Rear end connection part 50A, 50B, 50C, 50D, 50E, 50Z Tubular member 51 Inner peripheral surface of tubular member 52 Outer peripheral surface of tubular member 53A, 53B, 53C Tubular member main body portion 54A, 54B, 54C, 54D, 54E deformation portion 55A, 55B, 55C, 55D void portion 56A, 56B, 50C wire 57 linear portion 60 adhesive 70 inner first small diameter portion 71 1st inner stepped portion 72 1st outer small diameter portion 73 1st outer stepped portion 74 2nd inner small diameter portion 75 2nd inner stepped portion 76 2nd outer small diameter portion 77 2nd outer stepped portion 80 Inner tubular member 81 Inner deformable portion 82 Inner main body portion 83 Outer tubular member 84 Outer deformable portion 85 Outer main body portion 100F, 100Z First low-rigidity portion 200F, 200Z Second low-rigidity portion La Tubular member Length L1 Length of the first small diameter portion L2 Length of the second small diameter portion Lt Total length of the length of the first small diameter portion and the length of the second small diameter portion

Claims (10)

a first core shaft;
a second core shaft provided on the rear end side of the first core shaft;
a connection portion where the rear end portion of the first core shaft and the front end portion of the second core shaft are connected;
a tubular member that covers the outer periphery of the connecting portion,
The tubular member has a deformable portion that can be expanded and contracted in the axial direction, and the entire length of the tubular member can be adjusted by expanding and contracting the deformable portion.
guide wire. The guidewire of claim 1, comprising:
The deformable portion has a gap portion whose width in the axial direction can be changed, and the length in the axial direction can be changed by changing the width of the gap portion.
guide wire. 3. The guidewire according to claim 1 or claim 2,
The deformable portion is a coil,
guide wire. 3. The guidewire according to claim 1 or claim 2,
The deformation portion has a spiral cut, and the length in the axial direction can be changed by changing the width of the cut.
guide wire. A guidewire according to any one of claims 1 to 4,
At the rear end of the first core shaft, there is provided a first small-diameter portion having an outer diameter smaller than that of the other portion of the first core shaft, and a joint between the first small-diameter portion and the other portion of the first core shaft. A first stepped portion is formed between the
A second small-diameter portion having an outer diameter smaller than that of the other portion of the second core shaft and a portion between the second small-diameter portion and the other portion of the second core shaft are provided at the distal end portion of the second core shaft. A second stepped portion is formed at
the length of the tubular member when extended in the axial direction is greater than the total length of the first small diameter portion and the second small diameter portion;
the length of the tubular member when contracted in the axial direction is shorter than the total length;
guide wire. A guidewire according to claim 5, wherein
one end of the tubular member engages the first stepped portion;
the other end of the tubular member is engaged with the second stepped portion;
guide wire. A guidewire according to any one of claims 1 to 6,
The tubular member has a main body portion with greater bending rigidity than the bending rigidity of the deformation portion,
guide wire. A guidewire according to claim 7,
a rear end portion of the first core shaft and a front end portion of the second core shaft are provided with opposing surfaces facing each other,
wherein the body portion covers the facing surfaces of both the first core shaft and the second core shaft;
guide wire. A guidewire according to claim 7 or claim 8,
bending rigidity of the first core shaft is smaller than bending rigidity of the second core shaft,
The main body covers the outer periphery of the first core shaft,
the deformation portion covers the outer circumference of the second core shaft,
guide wire. A guidewire according to any one of claims 1 to 9,
The tubular member, the first core shaft, and the second core shaft are connected with an adhesive,
the adhesive is provided between the rear end of the first core shaft and the front end of the second core shaft inside the tubular member;
guide wire.

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