JPH0240992Y2 - - Google Patents

Description

[Detailed description of the invention] Background technical field of the invention The invention relates to a catheter guide wire that can guide a catheter, and is used to introduce a therapeutic or testing catheter to a predetermined site in a blood vessel, gastrointestinal tract, trachea, or other body cavity. , relates to a catheter guidewire that can be placed indwelling.

BACKGROUND ART Conventionally, as a guide wire for a catheter, one in which an inner core made of stainless steel wire or piano wire is embedded in a coiled body made of stainless steel wire has been used. All of the conventional guide wires described above have a relatively rigid main body by including an inner core whose cross-sectional area gradually decreases from the main body toward the distal end in a part or the entire length of the coiled body. and a relatively flexible tip.

The above-mentioned guide wire can be used to
It is inserted percutaneously into a blood vessel using an introducer needle, etc., and the tip opening of the catheter is inserted into the end of the main body of the guidewire outside the body, and the catheter is used to insert the catheter into the blood vessel with the guidewire as the axis. There are many things. Therefore, the above-mentioned guide wire can be smoothly inserted into a blood vessel against the resistance generated between the outer surface of the guide wire and the tissue, and also resists the resistance generated between the outer surface of the guide wire and the inner surface of the catheter. A certain degree of rigidity is provided to the main body so that the catheter can be guided.

However, as mentioned above, the main body of the conventional guidewire is made of a general metal material and undergoes plastic deformation when the displacement exceeds a certain level. This may cause the guidewire to buckle. In addition, as a result, the buckled portion becomes a deformed portion that cannot be restored, and when the catheter with the guidewire as an axis is guided to a predetermined site in the body, the deformed portion becomes a large resistance to the advancement of the catheter. This causes difficulty in smooth installation and operation. In addition, when guiding a catheter with the distal end curved in advance to facilitate insertion into a predetermined vascular site, the catheter is inserted into the guide wire and straightened. The insertion resistance of the catheter against the guide wire increases, and the possibility of trouble occurring due to the buckling increases.

In addition, after the catheter is inserted into the blood vessel together with the guide wire, the distal end of the guide wire, which protrudes by a predetermined length from the distal opening of the catheter, is further inserted into the blood vessel in order to reach a predetermined vascular site. We need to get ahead and push forward. Therefore, the tip of a conventional guide wire is required to have good shape adaptability even in a tortuous blood vessel without damaging the blood vessel wall, and to be flexible enough to be inserted into complicated blood vessel branches.

However, as mentioned above, the distal end of the conventional guide wire is made of a general metal material, and when the displacement exceeds a certain level, plastic deformation occurs and the guide wire becomes curved, making it difficult to connect the flexible blood vessel to the predetermined blood vessel site. In addition, even if the tip of the guide wire reaches the specified blood vessel site, the tip of the catheter has reduced resilience due to plastic deformation, so it is difficult to advance the tip of the catheter. When I go,
There is no resistance or stiffness between the guidewire tip and the blood vessel wall that is necessary to keep the guidewire tip in place against the bending stress of the catheter.
As a result, the distal end of the guide wire is pulled out from the predetermined blood vessel site. There are many cases where the device fails to be placed in the appropriate location and requires a large amount of procedure time. In addition, in order to prevent damage to the blood vessel wall and to prevent snagging while traveling inside the blood vessel, there is a guidewire whose tip is deformed into a J-shape in advance. Since it is always deformed into a straight line, the complete J
Many of them have the disadvantage that they do not restore their original shape and do not fully demonstrate their intended function.

Purpose of the invention An object of the invention is to provide a guide wire for a catheter that allows the catheter to be introduced into a predetermined site reliably and easily.

More specifically, the object is to provide a guidewire whose main body does not buckle during insertion and crown insertion.

Furthermore, it is an object of the present invention to provide a guide wire that can be restored to its original state even if buckled, and does not affect insertion and crown insertion resistance.

A further object of the present invention is to provide a guide wire whose distal end is flexible enough to be inserted into complicated blood vessels and has good resilience against deformation.

A further object is to provide a guidewire in which the distal end always has adequate repulsion resiliency so that the distal end remains in place when guiding the catheter.

Furthermore, the contact surface between the outer surface of the guide wire and the inner surface of the catheter is made to be in contact with the uneven surface, so that the area is small, and the two do not adhere to each other.
The purpose of the present invention is to provide a guide wire that slides with little force and facilitates insertion and placement of a catheter.

Structure and operation of the device In order to achieve the above object, the present invention forms an inner core by an inner core portion on the main body side and an inner core portion on the distal end side, and forms the entire inner core into a flexible substantially tubular shape. In a catheter guide wire that is internalized in the body and has a relatively rigid main body and a relatively flexible distal end, at least a portion of the main body inner core and the distal inner core are made of a superelastic metal. The tubular body has a rough surface.

Here, the main body is the part that is operated at hand when inserted into the blood vessel, and the distal end means the vicinity of the end that is guided to a predetermined site within the blood vessel. Further, the main body side inner core section means the inner core section on the main body side, and the distal end side inner core section means the inner core section on the distal end side.

Further, in the catheter guide wire according to the present invention, the main body side inner core portion is formed of a superelastic metal body.

Further, in the catheter guide wire according to the present invention, the inner core portion on the distal end side is formed of a superelastic metal body.

Further, in the catheter guide wire according to the present invention, both the main body side inner core portion and the distal end side inner core portion are formed of a superelastic metal body.

Further, in the catheter guide wire according to the present invention, the cross-sectional area of the inner core portion on the distal end side is smaller than the cross-sectional area of the inner core portion on the main body side.

Further, in the catheter guide wire according to the present invention, the cross-sectional area between the main body side inner core part and the distal end side inner core part is continuously reduced from the main body part toward the distal end part.

Further, in the catheter guide wire according to the present invention, the inner core part on the main body side is formed of a core material existing only in the main body part and a core material continuously existing from the main body part to the distal end part, and the inner core part on the distal end side The inner core portion is formed by a core material that is continuously present from the main body portion to the tip portion.

Further, in the catheter guide wire according to the present invention, the rough surface of the tubular body has a peak height of 0.01 to 0.15.
mm, and the distance between the peaks is 0.02 to 0.3 mm.

In addition, the catheter guide wire according to the present invention has a tubular body in a coil shape, and in this case, the rough surface of the tubular body is adjusted to the height of the peak.
More preferably, the uneven surface has an uneven surface of 0.03 to 0.15 mm and a pitch of 0.06 to 0.3 mm.

Further, in the catheter guide wire according to the present invention, the tubular body has a mesh shape, and in this case, the rough surface of the tubular body is made to have a peak height.
More preferably, the uneven surface has an uneven surface of 0.02 to 0.1 mm and a pitch of 0.04 to 0.2 mm.

Further, in the catheter guide wire according to the present invention, the tubular body is formed into a coil shape from a synthetic resin body.

Further, in the catheter guide wire according to the present invention, the tubular body is formed of a synthetic resin body in the form of a mesh.

In addition, the catheter guide wire according to the present invention has a tubular body made of a synthetic resin body and has a matte finish on the surface.In this case, the rough surface of the tubular body has a peak height of 0.01~ 0.1mm, mountain spacing
Preferably, the surface has an uneven surface of 0.02 to 0.2 mm.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 is a partially cutaway plan view showing a catheter guide wire 10 according to a first embodiment of the invention.

The guide wire 10 includes an inner core 11 and a tubular body 12, and forms a main body portion 10A and a distal end portion 10B.

The inner core 11 of the guide wire 10 is formed by integrating a main body side inner core portion 11A with a relatively large cross-sectional area and a distal side inner core portion 11B with a relatively small cross-sectional area via a tapered portion 11C, and the whole 49-58 atomic% Ni,
TiNi alloy with balance Ti, 38.5-41.5 wt% Zn, balance
Cu-Zn alloy, 1-10% by weight, 38.5-41.5
Cu-Zn-X alloy with weight% Zn and balance Cu (X=Be,
Si, Sn, Al, Ga), 36-38 atomic% Al, balance Ni
It is made of a superelastic (pseudoelastic) metal body such as Ni-Al alloy.

Further, the tubular body 12 of the guide wire 10 is
It is formed by a flexible coil spring made of metal or synthetic resin, and has uniform unevenness over its entire length, which disperses the contact surface with the inner surface of the catheter and reduces its area. The size of the unevenness is the height of the mountain 0.01 to 0.15 mm, preferably 0.03
~0.15mm, peak spacing 0.02~0.3mm preferably 0.06~
It is 0.3mm. If the height of the peak is less than 0.01 mm and the distance between the peaks is less than 0.02 mm, adhesive force will occur between the guide wire and the catheter, making it difficult to insert the catheter.
Detention becomes difficult. If the height of the ridges is greater than 0.15 mm and the distance between the ridges is greater than 0.3 mm, blood cells will accumulate in the gaps between the uneven surfaces, making it easier for blood clots to occur. The inner core becomes relatively thin, and the characteristic that the inner core is made of a superelastic metal body is lost. The height of the mountain is 0.03mm or more, and the distance between the mountains is
The reason why 0.06 mm or more is more preferable is that if it is less than this, the wire of the coil spring is thin, and the strength of the tubular body may be weakened depending on the material. When the tubular body 12 is made of metal, it is preferable to use a corrosion-resistant metal such as stainless steel wire or superelastic alloy. When the tubular body 12 is made of synthetic resin, polyethylene,
Preferred are polypropylene, polyamide, polystyrene, polysulfone, polyester, polyether, polyetherimide, polyarylate, and the like.

Note that the cross-sectional area of the tapered portion 11C is continuously reduced from the main body inner core portion 11A to the distal inner core portion 11B, and when the main body inner core portion 11A and the distal inner core portion 11B are connected. The guide wire 1 at the connection part has a gradual change in rigidity.
This makes it possible to prevent the occurrence of zero bending.

Further, at both ends of the inner core 11, the tubular body 12 is held, and the tip position of the guide wire 10 that is advanced within the blood vessel is
It has a bulge 11D that can be detected by a line.

FIG. 2 is a diagram showing the stress-strain characteristics of a superelastic metal by a solid line and the stress-strain characteristics of a general elastic metal by a broken line. That is, superelastic metals have (1) a large recoverable elastic strain, ranging from several % to 10
(2) Even if the strain increases, the magnitude of the load does not change. On the other hand, general elastic metals have small recoverable elastic strain, and
If a stress greater than the mark is applied, it will easily undergo plastic deformation. Therefore, since the guide wire 10 has its main body side inner core portion 11A made of a superelastic metal body, the main body portion 10A has elastic strain characteristics with relatively high buckling strength. Become. Further, the guide wire 10 has a distal inner core portion 11B.
Since it is made of a superelastic metal body,
The distal end portion 10B has an elastic strain characteristic that allows a relatively large displacement and restoration under a constant stress.

Next, the operation of the above embodiment will be explained. The guide wire 10 allows the curved portion of various shapes formed at the distal end of the catheter to become straight when the relatively rigid body portion 10A is inserted, allowing the catheter to advance smoothly in the blood vessel. shall be. Further, the guide wire 10 has its distal end 10B ahead of the distal end of the catheter, making it possible to guide the distal end of the catheter to a predetermined vascular site.

By covering the inner core 11 with the tubular body 12, the guide wire 10 can be used even when the catheter to be guided has a large diameter.
The diameter of the catheter is relatively small, the bending stiffness is kept within a certain range, and the outer diameter is matched to the inner diameter of the catheter to be guided, allowing the catheter to expand the skin and blood vessel walls effortlessly and smoothly. .

Further, in the guide wire 10, the entire inner core 11 is formed of a superelastic metal body, and the cross-sectional area of the distal end inner core portion 11B is smaller than that of the main body inner core portion 11A.
By making the cross-sectional area small compared to the cross-sectional area of This makes it possible to have resilient elastic strain characteristics. That is, the guide wire 10 has an elastic strain characteristic with relatively high buckling strength in its main body portion 10A. Therefore, even if a relatively large bending deformation occurs in the main body 10A when the guide wire 10 is inserted into a catheter or a blood vessel, the buckling of the main body 10A does not occur due to reaching the plastic deformation region. It becomes possible to improve the bending limit. That is, even if the main body portion 10A is significantly deformed due to hand manipulation applied to the guide wire 10, the deformed portion easily returns to its straight state and does not become a resistance to the advancement of the catheter. Further, even when a catheter having a curved portion at the tip is inserted into the crown while being straightened, the main body 10
A allows the catheter to be advanced smoothly without creating a large resistance between the catheter and the catheter.

Further, the guide wire 10 has a distal end portion 10B.
It has an elastic strain characteristic that allows it to undergo a relatively large displacement under a constant stress and can be restored. Therefore, when the distal end portion 10B moves through a bend in the blood vessel, it easily undergoes large bending deformation with a relatively small load, and curves in response to changes in the bend in the blood vessel without damaging the blood vessel wall. By repeating deformation and restoration, it has good shape adaptability to tortuous blood vessels, and can curve relatively easily to blood vessel branches, allowing smooth advancement to a predetermined blood vessel site. Further, when inserting the catheter into a predetermined blood vessel site, the distal end portion 10B is provided with sufficient repulsion elasticity to create the resistance against the blood vessel wall necessary to resist the bending stress of the catheter and remain in the predetermined position. To enable a catheter to be appropriately indwelled without being pulled out from a predetermined vascular site. Furthermore, even if the distal end portion 10B, which has been curved in advance, is deformed into a straight line when passing through the introducer needle, it will be restored to a completely curved shape upon subsequent insertion into the blood vessel, and the initial function will be fully satisfied. possible.

In addition, the guide wire 10 has the tubular body 12 formed of a coil spring.
Since its surface is uneven, the contact area with the inner surface of the catheter is small, and the adhesive force (adhesive force) with the inner surface of the catheter is small, resulting in low sliding resistance to the advancement of the catheter, making it easy to carry the catheter to peripheral blood vessels. It is possible to guide.

In addition, in the above embodiment, the main body part 10A and the tip part 10
The guide wire 10 in which both parts B are made of a superelastic metal body has been described. However, in the present invention, only the main body of the guidewire may be formed of a superelastic metal body, and the main body may have an elastic strain characteristic with relatively high buckling strength. Only the tip portion of the tip portion may be formed of a superelastic metal body, and the tip portion may be provided with an elastic strain characteristic that allows a relatively large displacement under a constant stress and allows recovery.

FIG. 3 is a partially cutaway plan view of a guide wire 20 according to a second embodiment of the present invention. The guide wire 20 consists of an inner core 21 and a tubular body 22,
It forms a main body portion 20A and a tip portion 20B.

The inner core 21 of the guide wire 20 is formed by a core material 23 and a core material 24 each made of a superelastic metal body, and the core material 23 and the core material 24 form a main body side inner core portion 21A, The tip side inner core portion 21B is formed only by the core material 24. In this case, the superelastic metal bodies of the core material 23 and the core material 24 may have different physical properties such as buckling strength and elastic strain characteristics. In addition, the guide wire 20
The tubular body 22 is formed of a flexible coil spring made of metal or synthetic resin, and has a uniformly uneven surface.
Note that a tubular body 22 is held at both ends of the inner core 21 to prevent the guide wire from penetrating the blood vessel wall, and to enable detection of the tip position of the guide wire 20 traveling inside the blood vessel using X-rays. It is provided with a bulging portion 21C.

Also in the case of the guide wire 20 according to the second embodiment, the main body portion 20A has an elastic strain characteristic with relatively high buckling strength, and the distal end portion 20B has a relatively large displacement under a constant stress. It becomes possible to provide resilient elastic strain characteristics, and therefore it becomes possible to introduce the catheter into a predetermined site reliably and easily.

FIG. 4 is a partially cutaway plan view of a catheter guide wire 30 according to a third embodiment of the present invention.

The guide wire 30 includes an inner core 31 and a tubular body 32, and forms a main body portion 30A and a distal end portion 30B.

The inner tube 31 of the guide wire 30 is formed by integrating a main body side inner core portion 31A with a relatively large cross-sectional area and a distal side inner core portion 31B with a relatively small cross-sectional area via a tapered portion 31C, and the entire body is It is made of superelastic metal. Moreover, the tubular body 3 of the guide wire 30
2 is formed of a flexible mesh body made of metal or synthetic resin, so that its surface is uniformly uneven. The size of the unevenness is such that the height of the peaks is 0.01 to 0.15 mm, preferably 0.02 to 0.1 mm, and the pitch of the peaks is 0.02 to 0.3 mm, preferably 0.04 to 0.2 mm. If the height of the ridges is less than 0.01 mm and the distance between the ridges is less than 0.02 mm, adhesive force will occur between the guide wire and the catheter, making insertion and placement of the catheter difficult.
The height of the peak is greater than 0.15mm, and the distance between the peaks is 0.3mm
If the size is larger, blood cells become trapped in the gaps between the uneven surfaces and a thrombus is likely to occur. Furthermore, this tendency is stronger when the tubular body is formed from a mesh body than when the tubular body is formed from a coil spring.
Preferably, the distance between the peaks is 0.2 mm or less. The reason why it is more preferable for the height of the peaks to be 0.02 mm or more and the distance between the peaks to be 0.04 mm or more is that depending on the material, it is difficult to form a tubular body with a mesh body and the strength is weak if it is less than this. This is to become. Note that a tubular body 32 is held at both ends of the inner core 31 to prevent the guide wire from penetrating the blood vessel wall, and to enable detection of the tip position of the guide wire 30 traveling inside the blood vessel using X-rays. It is provided with a bulging portion 31D.

Also in the case of this guide wire 30, the main body portion 30A has elastic strain characteristics with relatively high buckling strength, and the distal end portion 30B has elastic strain characteristics that allow a relatively large displacement and restoration under a constant stress. Therefore, the catheter can be reliably and easily introduced into a predetermined site.

FIG. 5 is a partially cutaway plan view of a catheter guide wire 40 according to a fourth embodiment of the present invention.

The guide wire 40 includes an inner core 41 and a tubular body 42, forming a main body portion 40A and a distal end portion 40B. The inner core 41 of the guide wire 40 is formed by integrating a main body inner core part 41A with a relatively large cross-sectional area and a tip-side inner core part 41B with a relatively small cross-sectional area through a tapered part 41C, and the whole is superelastic. It is made of metal. Further, the flexible tubular body 42 of the guide wire 40 is made of synthetic resin, and its surface is matte-finished to form a uniform uneven surface. Satin finish can be obtained by lowering the mold temperature by discarding the mold during synthetic resin extrusion molding or coating, or by slightly lowering the temperature of the synthetic resin, or by mechanically making the surface uneven or chemically dissolving it. A matte surface may be obtained by , corrosion, etc. The size of the unevenness is the height of the mountain
0.01~0.15mm preferably 0.01~0.1mm, spacing between peaks
0.02-0.3mmmm, preferably 0.02-0.2mmmm.
If the height of the ridges is less than 0.01 mm and the distance between the ridges is less than 0.02 mm, adhesive force will occur between the guide wire and the catheter, making insertion and placement of the catheter difficult. The height of the peak is greater than 0.15mm, and the distance between the peaks is
If it is larger than 0.3 mm, blood cells will accumulate in the gaps between the uneven surfaces, making it easier for blood clots to occur. Furthermore, compared to the case where the tubular body is formed using a coil spring, this tendency is stronger when the tubular body is formed by applying a satin finish to the synthetic resin body, so the height of the peaks is 0.1 mm or less, and the peak height is 0.1 mm or less. It is preferable that the interval is 0.2 mm or less. Note that a tubular body 42 is provided at both ends of the inner core 41.
The guide wire 40 is provided with a bulging portion 41D that holds the guide wire 40, prevents it from penetrating the blood vessel wall, and allows the position of the tip of the guide wire 40 traveling inside the blood vessel to be detected by X-rays.

Also in the case of this guide wire 40, the main body portion 40A has an elastic strain characteristic with a relatively large buckling strength, and the distal end portion 40B has an elastic strain characteristic that allows a relatively large displacement and restoration under a constant stress. Therefore, it becomes possible to introduce the catheter into a predetermined site reliably and easily.

Effects of the invention As described above, the present invention forms an inner core by the inner core part on the main body side and the inner core part on the distal end side, and makes the entire inner core inside the flexible tubular body, so that it is relatively rigid. In a catheter guidewire having a main body portion with a high elasticity and a relatively flexible distal end portion, at least a portion of the inner core portion on the main body side and the inner core portion on the distal end side are formed of a superelastic metal body, and Uniform irregularities are provided on the surface of the tubular body over the entire length to disperse the contact surface with the inner surface of the catheter and reduce its area. Therefore, it becomes possible to introduce the catheter into a predetermined site reliably and easily. In other words, the main body does not buckle during insertion and crown insertion operation.
Even if buckled, it is possible to obtain a guidewire that restores to its original state and does not affect insertion and crown insertion resistance. In addition, the tip has the flexibility to allow insertion into complex blood vessels, has good resilience against deformation, and has a constant appropriate repulsion elasticity. It is now possible to obtain a guidewire that remains in place. Furthermore, it is possible to obtain a guide wire in which the contact area between the outer surface of the guide wire and the inner surface of the catheter is made small so that the two do not adhere to each other over the entire length and slide smoothly with a slight force, thereby facilitating insertion and placement of the catheter. becomes possible.

Further, in the present invention, by forming the main body side inner core part from a superelastic metal body, it is possible to provide the main body part with elastic strain characteristics having relatively high buckling strength.

Furthermore, by forming the inner core part on the distal end side from a superelastic metal body, the present invention can provide the distal end part with an elastic strain characteristic that can be relatively largely displaced and restored under a certain stress. becomes.

In addition, the present invention provides the main body with elastic strain characteristics with relatively high buckling strength by forming both the main body side inner core part and the tip side inner core part with a superelastic metal body. It becomes possible to provide the tip with elastic strain characteristics that can be relatively largely displaced and restored under a constant stress.

In addition, the present invention makes the cross-sectional area of the inner core part on the distal end side smaller than that of the inner core part on the main body side.
It becomes possible to form a highly rigid main body portion and a flexible tip portion.

In addition, the present invention has a structure in which the cross-sectional area between the inner core on the main body and the inner core on the distal end is continuously reduced from the main body toward the distal end, so that the It is possible to make the change in rigidity gentle and prevent bending at the connection portion.

Further, in the present invention, the main body side inner core part is formed by a core material existing only in the main body part and a core material continuously existing from the main body part to the distal end part, and the distal inner core part is formed by:
It is formed by a core material that exists continuously from the main body to the tip.

In addition, by making the tubular body into a coil shape, the present invention makes it possible to easily obtain a flexible tubular body with a uniformly uneven surface, and furthermore, the catheter guide is strong against lateral crushing force. It becomes possible to use it as a wire.

In addition, the present invention makes it possible to easily obtain a flexible tubular body with a uniformly uneven surface by making the tubular body mesh-like, and furthermore, it is possible to obtain a catheter guide wire with strong torque properties. Can be done.

Further, according to the present invention, by forming the tubular body from a synthetic resin body and applying a satin finish to the surface, it becomes possible to easily obtain a flexible tubular body having an uneven surface.

In addition, in this invention, by forming the tubular body from a synthetic resin material, the surface of the tubular body made of a flexible material is made to have a rough surface, and the inner core of the guidewire is kept extremely flexible as a whole. without impairing the physical properties of the superelastic metal body.
The contact area between the outer surface of the guide wire and the inner surface of the catheter is reduced, so that the two do not stick together and slide with a small amount of force, making it possible to easily insert and indwell the catheter.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of a guide wire according to a first embodiment of the present invention, FIG. 2 is a diagram showing stress-strain characteristics of a superelastic metal, and FIG. FIG. 4 is a partially cutaway plan view of a guide wire according to a second embodiment of the present invention, FIG. 4 is a partially cutaway plan view of a guide wire according to a third embodiment of the present invention, and FIG. FIG. 7 is a partially cutaway plan view showing a guide wire according to a fourth embodiment. 10, 20, 30, 40...guide wire, 1
0A, 20A, 30A, 40A... Main body, 10
B, 20B, 30B, 40B... tip, 11,
21, 31, 41...Inner core, 11A, 21A, 3
1A, 41A...Main body side inner core part, 11B, 21
B, 31B, 41B...Tip side inner core part, 11C,
31C, 41C... Taper part, 12, 22, 3
2,42...Tubular body.

Claims (1)

[Claims for Utility Model Registration] (1) An inner core is formed by an inner core on the main body side and an inner core on the distal end side, and the entire inner core is internalized in a flexible substantially tubular body, and compared In a catheter guide wire having a main body having high rigidity and a relatively flexible distal end, at least a portion of the main body inner core and the distal inner core are formed of a superelastic metal body. Also, a catheter guide wire characterized in that the surface of the tubular body is roughened. (2) The guide wire for a catheter according to claim 1, wherein the inner core portion on the main body side is formed of a superelastic metal body. (3) The guide wire for a catheter according to claim 1, wherein the inner core portion on the distal end side is formed of a superelastic metal body. (4) The guide wire for a catheter according to claim 1, wherein both the main body side inner core portion and the distal side inner core portion are formed of a superelastic metal body. (5) The catheter guidewire according to claim 1, wherein the cross-sectional area of the inner core on the distal end side is smaller than the cross-sectional area of the inner core on the main body side. (6) The guidewire for a catheter according to claim 5, wherein the cross-sectional area between the inner core on the main body side and the inner core on the distal end is continuously reduced from the main body toward the distal end. . (7) The inner core on the main body side is formed by a core existing only in the main body and a core material continuously existing from the main body to the distal end, and the inner core on the distal end is formed from the main body. The guide wire for a catheter according to claim 5, which is formed of a core material continuously present at the distal end portion. (8) The rough surface of the tubular body has a peak height of 0.01 to 0.15.
The guide wire for a catheter according to any one of claims 1 to 7, which has an uneven surface with a pitch of 0.02 to 0.3 mm between the peaks. (9) The guide wire for a catheter according to any one of claims 1 to 7, wherein the tubular body is coiled. (10) The rough surface of the tubular body has a peak height of 0.03~
The guidewire for a catheter according to claim 9, which is registered as a utility model and has an uneven surface of 0.15 mm and an interval of 0.06 to 0.3 mm. (11) The guidewire for a catheter according to any one of claims 1 to 7, wherein the tubular body is mesh-shaped. (12) The rough surface of the tubular body has a peak height of 0.02~
The guide wire for a catheter according to claim 11, which is registered as a utility model and has an uneven surface of 0.1 mm and an interval of 0.04 to 0.2 mm. (13) The guide wire for a catheter according to any one of claims 1 to 12, wherein the tubular body is formed of a synthetic resin body. (14) The catheter guide wire according to any one of claims 1 to 7, which has a tubular body made of a synthetic resin and has a uniform satin finish on the surface. (15) The rough surface of the tubular body has a peak height of 0.01 to 0.1
15. The guide wire for a catheter according to claim 14, which has an uneven surface with a peak interval of 0.02 to 0.2 mm.