JPH1192847A - Superelastic wire and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a superelastic wire good in torque transmissibility and to provide a method for producing the same. SOLUTION: An alloy has a compsn. contg., by atom, 49.0 to 52.0% Ni, and the balance Ti, or contg. 49.0 to 52.0% Ni, 0.1 to 5% X (where X denotes at least one kind among V, Cr, Co and Fe), and the balance Ti. This alloy is formed into a wire rod, which is subjected to working at >=10% working ratio in the temp. range of -20 to 60 deg.C so as to impart superelasticity thereto, is subjected to heat treatment at 280 to 520 deg.C and is again subjected to heat treatment at 480 to 520 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a super-elastic wire and a method for producing the same, and more particularly, to an excellent torque transmitting property used for a catheter guide wire, a fishing rod inner feed wire, a feed guide wire such as a hollow tube, and the like. And a method of manufacturing the same.

[0002]

BACKGROUND OF THE INVENTION Catheter guidewires are flexible,
A superelastic wire is used because it requires recovery from bending deformation. When passing through a complicated blood vessel, this catheter guide wire rotates the rear end, transmits the rotation to the front end, adjusts the rotation in a predetermined direction, and sends the front end into the blood vessel. Incidentally, in the conventional superelastic wire, the rotational torque ratio between the rear end and the front end of the wire was 0.50 to 0.79. FIG. 6 shows an example of the relationship between the rear end and the rotation angle of the tip when the conventional superelastic wire is passed through the blood vessel, the rear end of the wire is rotated, and the rotation is transmitted to the tip. .

Conventionally, the superelastic wire used for these has been subjected to a heat treatment after obtaining a working rate of the superelastic alloy to give superelastic properties.

[0004]

However, when passing through a complicated blood vessel, the catheter guide wire described above has poor transmission of rotational torque as described above, and rotates the rear end in the direction of a predetermined blood vessel. Even if you try to adjust the direction of the tip while rotating, the amount of rotation of the rear end does not match the amount of rotation of the tip, it is difficult to control the position of the tip, and the time to insert the wire to the target position is long There was a disadvantage of becoming.

Accordingly, it is an object of the present invention to provide a superelastic wire having good torque transmission and a method for manufacturing the same.

[0006]

Means for solving the problem are as follows.

The present invention is a superelastic alloy wire having a rotational torque ratio of 0.80 to 1.00.

Further, the present invention provides the above superelastic wire,
It is a superelastic wire having at least superelastic properties within a temperature range of 20 ° C to 60 ° C.

Further, the present invention provides the superelastic wire, wherein the superelastic alloy is 49.0-52.0 at% Ni and the balance Ti, or 49.0-52.0 at% Ni, 0.1-5a.
It is a superelastic wire composed of t% X (where X is at least one of V, Cr, Co, and Fe) and the balance Ti.

The present invention also provides a method for manufacturing a superelastic wire as described above, wherein the superelastic alloy is processed at a processing rate of at least 10%, heat-treated between 280 ° C and 520 ° C, and This is a method for producing a superelastic wire that is heat-treated at 480 ° C to 520 ° C.

Further, the present invention is a through wire for fishing rods using any of the above superelastic wires.

Further, the present invention is a catheter guide wire using any of the above superelastic wires.

Further, the present invention is a wire guide for feeding in a hollow tube, characterized by using any one of the above superelastic wires. Here, the guide wire for feeding refers to a wire inserted into a pipe such as a bifurcated pipe, a wire inserted into a water pipe, a wire inserted into a thin tube or the like, but is not limited thereto. .

When the distal end portion of the catheter guide wire is rotated, the other end portion is also rotated. If a wire having good transmission of rotational torque is formed, the position of the other end portion of the wire can be easily controlled and the wire can be mounted. The time to enter can be shortened.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION 49.0-52.0 at% Ni and the balance Ti, or 49.0-52.0 at% Ni, 0.1-0.5 at%
A long superelastic alloy consisting of 5 at% X (where X is at least one of V, Cr, Co, and Fe) and the balance Ti is used as a wire, and is superelastic within a temperature range of -20 ° C to 60 ° C. In order to have the characteristics, it is processed at a processing rate of at least 10% or more, heat-treated between 280 ° C and 520 ° C, and again,
Heat treatment is performed between 480 ° C and 520 ° C. By this, when this wire is passed through the pipe and rotated in the axial direction, the rotation torque ratio between the rear end and the front end of the wire becomes
A superelastic wire of 0.80 to 1.00 is obtained.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

Ti-5 obtained by high-frequency vacuum melting
A 0.5 at% Ni alloy was formed into a wire having a diameter of 8 mm by a hot hammer and a hot roll. This wire rod was repeatedly subjected to cold drawing and heat treatment to obtain a wire rod having a diameter of 0.7 mm.
9%).

Next, the drawn wire is 1.5 mm long.
The sample was divided into several pieces, and these pieces were divided into several pieces and subjected to a heat treatment for 5 minutes while applying tension at a temperature between 280 ° C and 530 ° C. Tables 1 and 2 show the results of a 5% tensile test and a torque transmission test at 20 ° C. at different temperatures of each sample.

[0019]

[0020]

In the torque transmission test, a 1.5 mm wire was rounded into a 30 cm hoop, one end was rotated, and the rotation at the other end was observed using the torque transmission test device shown in FIG. . Hereinafter, a torque transmission test was performed using this torque transmission test apparatus.

In Table 1, the sample under the heat treatment condition of 250 ° C. was not softened and was broken in a 5% tensile test. All the samples under the conditions of 280 ° C to 520 ° C
Although the sample exhibited superelasticity from ℃ to 60 ℃, the residual strain was confirmed at -20 ℃ in the sample under the condition of 530 ℃.

From Table 2, it was confirmed that the sample at 530 ° C. had good torque transmission, and the samples at other heat treatment temperatures had poor torque transmission.

From these facts, it can be seen that there is no sample having both superelasticity and good torque transmission.

Next, the heat-treated samples were further divided into several pieces and subjected to a second heat treatment. The heat treatment was performed at a temperature of 450 ° C. to 530 ° C. for 5 minutes while applying tension. Tables 3, 4, 5, and 6 show the results of a 5% tensile test and a torque transmission test at 20 ° C. for each sample at different temperatures.

[0026]

[0027]

[0028]

[0029]

In Tables 3 and 4, the heat treatment condition from 250 ° C. to 520 ° C. was 450 ° C. in the 5% tensile test.
-20 ° C to 60 ° C under the second heat treatment condition up to 520 ° C
Although it showed superelasticity up to ℃, the residual strain was confirmed under the heat treatment conditions at 530 ° C. under the respective second heat treatment conditions.

From Tables 5 and 6, it was confirmed that the 250 ° C. heat-treated sample had poor torque transmission under the second heat treatment condition at 450 ° C. to 520 ° C.

It was also found that the heat-treated sample at 280 ° C. to 530 ° C. had good torque transmission under the second heat treatment condition at 480 ° C. to 520 ° C.

From these facts, the heat treatment conditions are 280 ° C.
The sample heat-treated at 520 ° C. was subjected to a second heat treatment at 450 ° C.
It was found that those treated at from -20 ° C to 520 ° C had good superelasticity and good torque transmission from -20 ° C to 60 ° C.

In the superelastic wire according to the present invention in which the results shown in Tables 1 to 6 are good in torque transmission, the rotational torque ratio between the rear end and the front end is 0.80 to 1 .00.

FIG. 1 shows a heat treatment condition of the manufacturing method of the present invention at 500 ° C. × 5 minutes and then a second heat treatment condition of 50 ° C.
The sample treated at 0 ° C. for 5 minutes was measured with a tensile tester while changing the temperature, and the obtained load-elongation curve is shown. -20
From ° C to 60 ° C, the amount of residual strain is small, indicating good superelastic properties.

FIG. 2 shows a heat treatment condition of the manufacturing method of the present invention at 500 ° C. for 5 minutes and then a second heat treatment condition of 50 ° C.
The sample treated at 0 ° C. for 5 minutes was rounded into a 30 cm hoop, and the angle obtained by measuring the angle at the tip and the angle at which the other end was rotated is shown. The rotated angle of the other end is substantially the same as the entered angle, and is on a straight line, indicating that torque is transmitted well.

FIG. 3 shows that the sample treated at 500 ° C. × 5 minutes after the second heat treatment and then subjected to the second heat treatment at 530 ° C. × 5 minutes was measured with a tensile tester while changing the temperature. -Shows an elongation curve. The residual strain at -20 ° C and -10 ° C is large, indicating that the superelasticity at low temperature is poor.

FIG. 4 shows that the sample treated at 500 ° C. × 5 minutes after the second heat treatment was rounded to a 30 cm hoop after the second heat treatment at 530 ° C. × 5 minutes. The angle obtained by measuring the angle at which the part was rotated is shown.
The rotation of the other end does not follow the entered angle and is curved, indicating that torque transmission is poor.

When the superelastic wire of the present invention was used as a through wire for a fishing rod, a catheter guide wire, and a guide wire for feeding in a hollow tube, the results were good.

[0040]

As described above, according to the present invention, there is provided a superelastic wire exhibiting superelasticity from -20.degree. C. to 60.degree. C. and having good torque transmission and a method for producing the same. be able to.

[Brief description of the drawings]

FIG. 1 shows a heat treatment of a superelastic wire at 500 ° C. for 5 minutes.
The figure which shows the load-elongation curve which performed the 5% tensile test in the measurement temperature from -20 degreeC to 60 degreeC which heat-processed for 5 degreeC x 5 minutes.

FIG. 2 shows a 500 ° C. × 5 minute heat treatment of a superelastic wire,
The figure which shows the curve of the angle which the front-end | tip part put in, and the rotation angle of the other end part in 20 degreeC which performed heat processing for 5 degreeC x 5 minutes.

[FIG. 3] After heat treatment of a superelastic wire at 500 ° C. for 5 minutes, 530
The figure which shows the load-elongation curve which performed the 5% tensile test in the measurement temperature from -20 degreeC to 60 degreeC which heat-processed for 5 degreeC x 5 minutes.

FIG. 4 shows a 530 after heat treatment of a superelastic wire at 500 ° C. for 5 minutes.
The figure which shows the curve of the angle which the front-end | tip part put in, and the rotation angle of the other end part in 20 degreeC which performed heat processing for 5 degreeC x 5 minutes.

FIG. 5 is a schematic explanatory view of a torque transmission test device.

FIG. 6 is a diagram showing curves of the angle at which the rear end of the wire is inserted and the rotation angle of the front end of the conventional superelastic wire.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C22F 1/00 675 C22F 1/00 675 691 691B 694 694A

Claims (7)

[Claims] 1. A super-elastic alloy wire, wherein a rotation torque ratio of the wire is 0.80 to 1.00. 2. The superelastic wire according to claim 1, wherein
A superelastic wire having at least superelastic properties in a temperature range of 0 ° C to 60 ° C. 3. The superelastic wire according to claim 1, wherein the superelastic alloy is 49.0 to 52.0 at% Ni.
And the balance Ti, or 49.0 to 52.0 at% Ni,
A super-elastic wire comprising 1 to 5 at% X (where X is at least one of V, Cr, Co, and Fe) and the balance Ti. 4. The super-elastic alloy is processed at a processing rate of at least 10%, heat-treated at 280 ° C. to 520 ° C., and heat-treated again at 480 ° C. to 520 ° C. The method for producing a superelastic wire according to claim 1. 5. A through wire for a fishing rod, wherein the superelastic wire according to claim 1 is used. 6. A catheter guide wire using the superelastic wire according to claim 1. 7. A guide wire for feeding in a hollow tube, wherein the superelastic wire according to claim 1 is used.