JP4302604B2 - Superelastic titanium alloy for living body - Google Patents

Description

  The present invention relates to a superelastic titanium alloy. In particular, it relates to a bioelastic superelastic titanium alloy that is optimal for medical equipment and the like.

In recent years, alloy materials having superelastic properties have been used in the medical field.
For example, Ti—Ni-based alloys have characteristics such as excellent strength, wear resistance, and corrosion resistance, and good compatibility with living organisms, and are used in various medical devices as biomaterials.
However, in biomaterials using Ti-Ni alloys, the contained Ni may cause allergic symptoms, so it does not contain elements that may cause toxicity or allergies to the living body, and is safer. Biomaterials include Ni-free Ti-Nb-Sn shape memory alloys (see Patent Document 1) and super-elastic Ti-Mo-X (X: Ga, Al, Ge) alloys for living bodies (see Patent Document 2). ) Etc. have been proposed.

JP 2001-329325 A JP 2003-293058 A

With the advent of titanium alloys that do not contain Ni proposed in Patent Document 1 and Patent Document 2, the development of products that can effectively utilize superelastic characteristics and shape memory characteristics in the fields of use that directly touch the living body or the skin. Prompted.
However, a variety of medical equipment members such as medical guide wires, orthodontic wires, and stents, and daily products such as spectacle frames and spectacle nose pads that use the titanium alloy that does not contain Ni are used. However, it is not satisfactory in terms of cold workability and superelastic properties, and development of higher performance materials is desired.
Accordingly, the present invention proposes a superelastic titanium alloy which does not contain Ni, which has excellent superelastic characteristics, is excellent in cold workability and has good productivity.

  The invention according to claim 1 is characterized in that one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, are 15 mol% ≦ 1.5x + y ≦ 45 mol% (x is Nb content, y is Ta content) In addition, the content of Zr is 1 to 20 mol%, the content of Mo is 1 to 6 mol%, the total amount of Ta, Nb, Zr and Mo is 60 mol% or less, and the balance is Ti and inevitable impurities. This is a superelastic titanium alloy for living bodies.

  The invention according to claim 2 is characterized in that one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, are 15 mol% ≦ 1.5x + y ≦ 45 mol% (x is Nb content, y is Ta content) 2), Zr is contained in a range of 1 to 10 mol%, Mo is contained in an amount of 1 to 4 mol%, and the total amount of Ta, Nb, Zr and Mo is 50 mol% or less, and the remainder is composed of Ti and inevitable impurities. This is a superelastic titanium alloy for living bodies.

  The invention according to claim 3 is characterized in that one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, are 15 mol% ≦ 1.5x + y ≦ 45 mol% (x is Nb content, y is Ta content) In the range indicated by the formula (1), Zr is contained in an amount of 1 to 20 mol%, Mo is contained in an amount of 1 to 6 mol%, and one or two or more of A, Ge, Ga, In, and Sn are combined in total. A bioelastic super-titanium alloy containing 1 to 10 mol%, further comprising a total amount of Ta, Nb, Zr, Mo and A group of 60 mol% or less and comprising the remainder Ti and inevitable impurities.

  The invention according to claim 4 is characterized in that one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, are 15 mol% ≦ 1.5x + y ≦ 45 mol% (x is Nb content, y is Ta content). In the range indicated by the following formula: Zr is contained in an amount of 1 to 10 mol%, Mo is contained in an amount of 1 to 4 mol%, and one or more of A, Ge, Ga, In, and Sn are included in total. A bioelastic super-titanium alloy containing 1 to 6 mol%, further comprising Ta, Nb, Zr, Mo, and group A in a total amount of 50 mol% or less and comprising the remainder Ti and inevitable impurities.

In the invention according to claim 5, one or two of Ta and Nb, which are β-phase stabilizing elements of titanium,
15 mol% ≦ 1.5x + y ≦ 45 mol% (x represents Nb content, y represents Ta content)
In the range indicated by the following, then one or two of Zr and Mo, Zr is 1 to 20 mol
%, Mo is contained in the range of 1 to 6 mol% in total, and 1 to 26 mol% in total, Al, Ge
, Ga, In , Au, Ag, Pt, Pd, one or two or more from group B consisting of 1 in total
It is a bioelastic super-titanium alloy characterized in that it is contained in an amount of 10 to 10 mol%, and the total amount of Ta, Nb, Zr, Mo and B group is 60 mol% or less, and consists of the remainder Ti and inevitable impurities.

In the invention according to claim 6, one or two of Ta and Nb, which are β-phase stabilizing elements of titanium,
15 mol% ≦ 1.5x + y ≦ 45 mol% (x represents Nb content, y represents Ta content)
In the range indicated by the following, then one or two of Zr and Mo, Zr is 1 to 10 mol
%, Mo is contained in the range of 1 to 4 mol% in total, 1 to 14 mol% in total, Al, Ge
, Ga, In , Au, Ag, Pt, Pd, one or two or more from group B consisting of 1 in total
It is a superelastic titanium alloy for living bodies, characterized in that it contains ˜6 mol%, and the total amount of Ta, Nb, Zr, Mo and B group is 50 mol% or less, and consists of the remainder Ti and inevitable impurities.

  The invention according to claim 7 is characterized in that one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, are 15 mol% ≦ 1.5x + y ≦ 45 mol% (x is Nb content, y is Ta content) In the range represented by the formula (1), and then one or two of Zr and Mo, 1 to 26 mol% in total within a range of 1 to 20 mol% Zr and 1 to 6 mol%, and C, C group consisting of B, O, N, H, Si is contained in a total of 0.01 to 1.0 mol%, and the total amount of Ta, Nb, Zr, Mo, and C group is 60 mol% or less, and the remainder is inevitable with Ti. It is a superelastic titanium alloy for living body characterized by comprising impurities.

  The invention according to claim 8 is characterized in that one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, are 15 mol% ≦ 1.5x + y ≦ 45 mol% (x is Nb content, y is Ta content). In the range indicated by the formula (1), and then one or two of Zr and Mo are contained in a range of 1 to 20 mol% Zr and 1 to 6 mol% of Mo in a total of 1 to 26 mol%, Al, 1 to 10 mol% in total of 1 type or 2 types or more from B group consisting of Ge, Ga, In, Sn, Au, Ag, Pt, Pd, and C consisting of C, B, O, N, H, Si The total amount of the group is 0.01 to 1.0 mol%, and the total amount of Ta, Nb, Zr, Mo, B group and C group is 60 mol% or less, and is composed of the balance Ti and inevitable impurities. It is a superelastic titanium alloy for living organisms.

  The invention according to claim 9 is characterized in that one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, are 15 mol% ≦ 1.5x + y ≦ 45 mol% (x is Nb content, y is Ta content) In the range represented by the formula (1), and then containing one or two of Zr and Mo within a range of 1 to 10 mol% Zr and 1 to 4 mol% of Mo, 1 to 6 mol% in total of 1 type or 2 types or more from B group consisting of Ge, Ga, In, Sn, Au, Ag, Pt, Pd, C consisting of C, B, O, N, H, Si The total content of the group is 0.01 to 0.5 mol%, and the total amount of Ta, Nb, Zr, Mo, B group and C group is 50 mol% or less, and the remainder is composed of Ti and inevitable impurities. It is a superelastic titanium alloy for living organisms.

  A tenth aspect of the present invention is a medical guide wire using the living body superelastic titanium alloy according to any one of the first to ninth aspects.

  An eleventh aspect of the present invention is an orthodontic wire using the living body superelastic titanium alloy according to any one of the first to ninth aspects.

  A twelfth aspect of the present invention is a stent using the bioelastic super-titanium alloy according to any one of the first to ninth aspects.

  A thirteenth aspect of the present invention is a spectacle member using the biosuperelastic titanium alloy according to any one of the first to ninth aspects.

  A fourteenth aspect of the present invention is an endoscope actuator using the living body superelastic titanium alloy according to any one of the first to ninth aspects.

  The present invention is a titanium alloy containing Nb and Ta alone or both in Ti, and then containing both or alone Zr and Mo, and further, if necessary, Al, Ge, Ga, In, Sn, Au, A titanium alloy containing an appropriate amount of an element selected from Ag, Pt, Pd, C, B, O, N, H, and Si, having excellent superelastic characteristics and excellent cold workability. . Furthermore, since the component of the present invention is an element exhibiting good biocompatibility and does not contain Ni, there is less concern about allergies, and it can be applied to living items such as medical devices and living items that come into contact with skin such as eyeglass frames. It is suitable for use and has an industrially significant effect.

First, Ta, Nb, Zr, and Mo, which are components of the alloy according to the present invention, are contained in Ti, thereby making the titanium alloy a titanium alloy that causes a thermoelastic martensitic transformation and a β-phase stabilizing element. Also, it functions to lower the transformation temperature from the β phase to the α phase to the low temperature side. This indicates that a titanium alloy in which the β phase which is the parent phase in the martensitic transformation is stable at room temperature can be obtained.
Furthermore, when Ta dissolves in Ti, it plays the role of solid solution strengthening, increases the critical stress against slip deformation, makes slip deformation less likely to occur, and realizes good superelasticity. Therefore, the transformation temperature is small and the transformation temperature is easily controlled, contributing to stable production.

  By the way, when Ta and Nb contain one or both, the content is 15 mol% ≦ 1 when the Nb amount is x and the Ta amount is y (both x and y are in mol%). Including the amount of Ta and Nb in the range represented by .5x + y ≦ 45 mol% (the range is shown in FIG. 1), and the superelastic property is not exhibited or is reduced outside the range. It is a thing.

Next, the reason why the amount of Zr is limited to 1 to 20 mol% is that the superelastic characteristics become better within this range, but if the content exceeds Zr, the workability is extremely lowered. In particular, when emphasizing cold workability, 1 to 10 mol% is desirable.
Regarding the amount of Mo, the content is set to 1 to 6 mol%, as in the case of Zr, the superelastic property becomes better within this range, but the content exceeding it extremely decreases the workability. This is because it causes them to stagnate. In particular, when emphasizing cold workability, 1 to 4 mol% is desirable.

A group consisting of Al, Ge, Ga, In, Sn, or Al, Ge, Ga, In, Sn
B group consisting of Au, Ag, Pt, and Pd contains one or more kinds,
The group A composed of Al, Ge, Ga, In, and Sn has a large effect as an α-phase stabilizing element, and is due to precipitation hardening by α-phase precipitates. thereby improving the superelastic properties, in will also serve to improve the cold workability. On the other hand, Al, G
In the B group consisting of e, Ga, In, Sn, Au, Ag, Pt, Pd, Au, Ag, P
t and Pd precipitate Ti3Au, Ti2Ag, Ti3Pt, Ti4Pd, etc. from the eutectoid reaction during the heat treatment, respectively, thereby improving the superelastic characteristics by precipitation hardening, and further generating a dense structure by the eutectoid reaction, Stable superelastic characteristics can be obtained. In addition, these elements are highly biocompatible and have a high X-ray contrast effect.

  It is this range that the total of the group A consisting of Al, Ge, Ga, In, Sn and the group B consisting of Al, Ge, Ga, In, Sn, Au, Ag, Pt, Pd is limited to 1 to 10 mol%. This is because the superelastic property becomes better inside, but the content exceeding the limit causes the workability to be extremely lowered. In particular, when the cold workability is important, 1 to 6 mol% is desirable.

Next, C, B, O, N, H, and Si contained in the titanium alloy mainly function as an intrusive element in the titanium alloy, and have a function of improving superelastic characteristics by solid solution hardening and structure refinement. Is.
The reason why the total amount of C, B, O, N, H, and Si contained in the titanium alloy is limited to 0.01 to 1 mol% is to make the superelastic property better within this range, Is because the cold workability and the hot workability are greatly impaired, and particularly when the cold workability is important, 0.01 to 0.5 mol% is desirable.

The titanium alloy according to the present invention is a super-elastic titanium alloy for living organisms and has good super-elastic characteristics, and is less likely to cause allergies and has good biocompatibility. Therefore, a medical guide wire, an orthodontic wire, It can be used for biomedical devices such as stents and endoscope actuators, and can also be used for contact with bare skin such as a spectacle frame or a nose pad arm of spectacles.
Hereinafter, the present invention will be described in detail using examples.

Example 1
Ti-Nb-Zr-Mo alloy ingots having the alloy compositions shown in Table 1 were produced using a non-consumable tungsten electrode type argon arc melting furnace. This ingot is subjected to hot working, then intermediate annealing at 700 ° C. for 10 minutes and cold wire drawing are repeated, and finish cold wire drawing is performed at a finish cold working rate of 40%. A cold-worked material having a thickness of 1.0 mm was obtained and used as a test material (cold-worked material). A part of the test material (cold work material) was subjected to a linear shape memory heat treatment at 600 ° C. for 30 minutes and used as the test material (memory material). In addition, about the wire which cannot be drawn with the finish cold work rate of 40%, the finish cold wire drawing was performed with the cold work rate of 20%.
The superelastic property was evaluated using a test material (memory material), and the cold workability was evaluated using a test material (cold work material). The results are shown in Table 1.

  The evaluation of superelastic properties was carried out by performing a tensile test in which the test material (memory material) was unloaded after adding 4% elongation at room temperature based on JIS H7103, and the residual elongation was measured.

  The cold workability can be evaluated by subjecting the specimen (cold work material) to annealing at 700 ° C. for 10 minutes, producing an annealed material, and breaking the annealed material for cold wire drawing. The cold drawing was continued until it disappeared, and the maximum processing rate was evaluated. When the maximum processing rate is 40% or more, it is indicated by “◯” that the cold workability is good, and when the maximum processing rate is more than 20% and less than 40%, the cold workability is slightly inferior. “,” And the case below that is “x”.

As is clear from Table 1, Example No. of the present invention. 1 to No. No. 15, a superelastic characteristic showing a small residual elongation of 1.5% or less is obtained. 1, 2, 4, 5, 7, 8, 13, and 14 were excellent in cold workability.
On the other hand, Comparative Example No. with a large amount of Zr or Mo. 204, no. In 203, the cold workability was inferior, and the sample material could not be prepared. Comparative Example No. with a small amount of Nb 200, comparative example No. with a large amount of Nb. 201, no. In 202, no good superelastic property was obtained, and the shape did not recover.
In FIG. 8, FIG. A stress-elongation curve of 200 is shown.
The vertical axis indicates tensile stress (MPa), and the horizontal axis indicates elongation (%). 7 has a residual elongation of 0.9%. For 200, the residual elongation of 1.8% is indicated by arrows in FIGS.

(Example 2)
Test materials of Ti—Ta—Zr—Mo alloys having the alloy compositions shown in Table 2 were prepared by the same method as in Example 1, and superelastic properties and cold workability were similarly evaluated by the evaluation method shown in Example 1. The results are shown in Table 2.

As is apparent from Table 2, Example No. of the present invention. 16 to No. No. 29 had good superelastic characteristics and good cold workability. Especially this invention example No. whose Zr amount is 10 mol% or less and Mo amount is 4 mol% or less. In 16, 17, 19, 20, 22, 23, 28, and 29, the cold workability was excellent.
On the other hand, Comparative Example No. with a small amount of Ta. No. 206 showed a large residual elongation and did not obtain satisfactory superelastic properties and did not recover its shape. Comparative Example No. containing a large amount of Ta 207, no. 208 and Comparative Example No. in which the total amount of Ta, Zr and Mo exceeds 60 mol%. No. 205 is inferior in both superelastic characteristics and cold workability. Comparative Example No. with a large amount of Zr or Mo 210, no. In No. 209, the cold workability was poor and the sample material could not be produced.

(Example 3)
A test material of a Ti—Nb—Ta—Zr—Mo alloy having the alloy composition shown in Table 3 was produced by the same method as in Example 1, and the superelastic characteristics and cold workability were evaluated in the same manner as in Example 1. The results are shown in Table 3.

As is apparent from Table 3, Example No. of the present invention. 30 to No. No. 43 has good superelastic properties and excellent cold workability.
On the other hand, Comparative Example No. in which the total amount of Nb and Ta is less than 15 mol%. 211, comparative example No. whose total is more than 45 mol%. In 212, it can be seen that the residual strain is increased. Comparative Example No. with too much Mo and Zr. 213, no. In 214, the cold workability was poor and a sample could not be prepared, and the superelastic characteristics could not be evaluated.

(Example 4)
Test materials of Ti—Nb—Zr—Al alloys having the alloy compositions shown in Table 4 were prepared by the same method as in Example 1, and superelastic properties and cold workability were similarly evaluated by the evaluation method shown in Example 1. The results are shown in Table 4.

As is clear from Table 4, No. of the present invention example. 44 to No. In 61, the superelastic property was good and the shape recovered.
On the other hand, the comparative example No. 215, Comparative Example No. 216, no. In 217, the superelastic characteristics were greatly reduced. Comparative Example No. with too much Al and Zr. 218, no. In 219, the cold workability was poor and a sample could not be prepared, and the superelastic characteristics could not be evaluated.

(Example 5)
A test material of a Ti—Nb—Zr—Mo—Sn alloy having the alloy composition shown in Table 5 was produced by the same method as in Example 1, and the superelastic properties and cold workability were evaluated in the same manner as in Example 1. The results are shown in Table 5.

As is clear from Table 5, No. of the present invention example. 62 to No. In 79, the superelastic characteristics were good and the shape recovered.
On the other hand, the comparative example No. 221, comparative example no. 222, no. In the case of H.223, the superelastic property was greatly deteriorated. Comparative Example No. with too much Sn, Mo and Zr. 220, no. 224, no. 225, no. In 226, the cold workability was poor and a sample could not be produced, and the superelastic characteristics could not be evaluated.

(Example 6)
A test material of a Ti—Nb—Ta—Zr—Al alloy having the alloy composition shown in Table 6 was produced by the same method as in Example 1, and the superelastic properties and cold workability were evaluated in the same manner as in Example 1. The results are shown in Table 6.

As is apparent from Table 6, No. of the present invention example. 80 to No. In 94, the superelastic characteristics were good and the shape recovered.
On the other hand, the total of Nb amount and Ta amount is too small. Comparative Example No. 227, Nb amount and Ta amount are too large. In 228, the superelastic property was greatly reduced. Comparative Example No. with too much Al and Zr. 229, no. In No. 230, the cold workability was poor and a sample could not be prepared, and the superelastic characteristics could not be evaluated.

(Example 7)
Test materials of Ti—Nb—Mo—Au alloys having the alloy compositions shown in Table 7 were prepared by the same method as in Example 1, and superelastic properties and cold workability were similarly evaluated by the evaluation method shown in Example 1. The results are shown in Table 7.

As is apparent from Table 7, No. of the present invention example. 95 to No. In 112, the superelastic characteristics were good and the shape recovered.
On the other hand, the comparative example No. 231, Comparative Example No. In 232, the superelastic characteristics were greatly reduced. Comparative Example No. with too much Au and Mo. 233, no. In 234, the cold workability was poor and a sample could not be produced, and the superelastic characteristics could not be evaluated.

(Example 8)
A test material of a Ti—Nb—Mo—Al—Au alloy having the alloy composition shown in Table 8 was produced by the same method as in Example 1, and the superelastic characteristics and the cold workability were evaluated in the same manner as in Example 1. The results are shown in Table 8.

As is apparent from Table 8, No. of the present invention example. 113 to No. In 134, the superelastic characteristics were good and the shape recovered.
On the other hand, the comparative example No. 235, Comparative Example No. In 236, the superelastic characteristics were greatly reduced. Comparative Example No. with too much Au, Al and Mo. 237, no. 239, no. 240, and Comparative Example No. with a large sum of Al and Au. In 238, the cold workability was poor and a sample could not be prepared, and the superelastic characteristics could not be evaluated.

Example 9
Test materials of Ti—Nb—Mo—C alloys having the alloy compositions shown in Table 9 were prepared by the same method as in Example 1, and superelastic properties and cold workability were similarly evaluated by the evaluation method shown in Example 1. The results are shown in Table 9.

As is clear from Table 9, No. of the present invention example. 135 to No. At 155, the superelastic characteristics were good and the shape recovered.
On the other hand, the comparative example No. 241, comparative example no. At 242 the superelastic properties were greatly reduced. Comparative Example No. with too much Mo amount Comparative Example No. 244 or too much C amount In No. 243, the cold workability was poor and a sample could not be produced, and the superelastic characteristics could not be evaluated.

(Example 10)
A test material of Ti—Nb—Mo—Al—B alloy having the alloy composition shown in Table 10 was produced by the same method as in Example 1, and the superelastic properties and cold workability were evaluated in the same manner as in Example 1. The results are shown in Table 10.

As is clear from Table 10, No. of the present invention example. 156 to No. In 177, the superelastic characteristics were good and the shape recovered.
On the other hand, the comparative example No. Comparative Example No. 245, Nb amount is too large. In H.246, the superelastic property was greatly deteriorated. Comparative Example No. with too much Al and Mo. 248, no. 249 and Comparative Example No. with a large amount of B In No. 247, the cold workability was poor and a sample could not be produced, and the superelastic characteristics could not be evaluated.

Example 11
A Ti-15mol% Nb-2mol% Zr-3mol% Mo alloy ingot produced using a non-consumable tungsten electrode type argon arc melting furnace is hot-worked, and then subjected to intermediate annealing and cold holding at 700 ° C. for 10 minutes. The wire drawing was repeated, and the finish cold drawing was performed at a finish cold working rate of 40% to obtain a cold worked material having a wire diameter of 0.5 mm. This cold-worked material was subjected to a linear shape memory heat treatment at 600 ° C. for 30 minutes to produce a medical guide wire, an orthodontic wire, and a linear actuator wire, and the superelasticity measured by the method used in Example 1 The characteristics are shown in Table 11. For the medical guide wire, the torque transmission was measured by the method shown in FIG.

Torque transmission is the following angle at the other end when a predetermined twist is applied to one end of the wire rod in the pipe, specifically, a polyethylene tube 5 (inner diameter 3 mm, The following angle of the other end when the one end of the specimen 1 passed through the outer diameter of 4 mm) was twisted by 90 ° was measured. The case where the following angle was 85 ° or more was evaluated as “◎”, the case where 85 ° to 80 ° was “◯”, the case where 80 ° to 75 ° was “Δ”, and less than 75 ° was evaluated as “x”.
In FIG. 4, 6a represents a drive-side rotary encoder, 6b represents a follow-up rotary encoder, and 7 represents a drive unit.

Example 12
A wire rod for a spectacle frame having a wire diameter of 2.0 mm obtained by subjecting a Ti-10 mol% Nb-15.0 mol% Ta-1.0 mol% Zr-4.0 mol% Mo alloy to a linear shape memory treatment in the same manner as in Example 11. The superelastic properties were measured by the same method as in Example 1, and the results are also shown in Table 11.

  As can be seen from Table 11, the Ti alloy according to the present invention is used for applications requiring excellent superelastic properties such as medical guide wires, orthodontic wires, linear actuators, spectacle frames, spectacle nose pad arms, and the like. It has sufficient superelastic characteristics and cold workability.

(Example 13)
When the medical guidewire wire, orthodontic wire wire, and spectacle frame wire prepared in Example 11 and Example 12 were used, and the medical guidewire, orthodontic wire, and spectacle frame were prepared and tested, It was able to be used in the same way as the conventional product.

It is explanatory drawing which shows the relationship between Ta amount and Nb amount. Invention Example No. It is a stress-elongation curve in the room temperature state of 8 alloys. Comparative Example No. It is a stress-elongation curve in the room temperature state of 200 alloy. It is explanatory drawing of the measuring method of torque transmissibility.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Specimen 2 Stainless steel round bar 5 Polyethylene tube 6a Drive side rotary encoder 6b Tracking side rotary encoder 7 Drive part

Claims (14)

Contains one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, within a range indicated by 15 mol% ≦ 1.5x + y ≦ 45 mol% (x represents Nb content, y represents Ta content) Furthermore, it contains 1 to 20 mol% of Zr and 1 to 6 mol% of Mo, the total amount of Ta, Nb, Zr and Mo is 60 mol% or less, and consists of the remainder Ti and inevitable impurities, Elastic titanium alloy. Contains one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, within a range indicated by 15 mol% ≦ 1.5x + y ≦ 45 mol% (x represents Nb content, y represents Ta content) Furthermore, it contains 1 to 10 mol% of Zr and 1 to 4 mol% of Mo, the total amount of Ta, Nb, Zr and Mo is 50 mol% or less, and consists of the remainder Ti and inevitable impurities. Elastic titanium alloy. Contains one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, within a range indicated by 15 mol% ≦ 1.5x + y ≦ 45 mol% (x represents Nb content, y represents Ta content) Then, Zr is contained in an amount of 1 to 20 mol%, Mo is contained in an amount of 1 to 6 mol%, 1 type or 2 or more types are contained in total from Group A consisting of Al, Ge, Ga, In, and Sn, A superelastic titanium alloy for living bodies, characterized in that the total amount of Ta, Nb, Zr, Mo and A group is 60 mol% or less, and the balance is Ti and inevitable impurities. Contains one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, within a range indicated by 15 mol% ≦ 1.5x + y ≦ 45 mol% (x represents Nb content, y represents Ta content) Then, 1 to 10 mol% of Zr, 1 to 4 mol% of Mo, 1 type or 2 types or more from group A consisting of Al, Ge, Ga, In, and Sn are contained in total, and further 1 to 6 mol% A superelastic titanium alloy for living bodies, characterized in that the total amount of Ta, Nb, Zr, Mo and A group is 50 mol% or less, and the balance is Ti and inevitable impurities. One or two of Ta and Nb, which are β-phase stabilizing elements of titanium, are added at 15 mol% ≦ 1.5x +
y ≦ 45 mol% (x represents Nb content, y represents Ta content)
Next, one or two of Zr and Mo, Zr is 1 to 20 mol%, Mo is 1 to 6 mol%
In the range of 1 to 26 mol% in total, Al, Ge, Ga, In , Au, Ag
1 to 2 mol in total from Group B consisting of Pt, Pt, and Pd, and the total amount of Ta, Nb, Zr, Mo, and Group B is 60 mol% or less, with the remainder Ti and inevitable impurities A superelastic titanium alloy for living body, characterized by comprising:
One or two of Ta and Nb, which are β-phase stabilizing elements of titanium, are added at 15 mol% ≦ 1.5x +
y ≦ 45 mol% (x represents Nb content, y represents Ta content)
Next, one or two of Zr and Mo, Zr 1 to 10 mol%, Mo 1 to 4 mol%
In the range of 1 to 14 mol% in total, Al, Ge, Ga, In , Au, Ag
1 to 2 mol% in total from Group B consisting of Pt, Pt, Pt, Pd, and the total amount of Ta, Nb, Zr, Mo and B groups is 50 mol% or less, with the remainder Ti and inevitable impurities A superelastic titanium alloy for living body, characterized by comprising:
Contains one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, within a range indicated by 15 mol% ≦ 1.5x + y ≦ 45 mol% (x represents Nb content, y represents Ta content) Then, one or two of Zr and Mo are contained in a total amount of 1 to 26 mol% in the range of 1 to 20 mol% of Zr and 1 to 6 mol% of Zr, and C, B, O, N, H, A total of 0.01 to 1.0 mol% of C group consisting of Si, and further, the total amount of Ta, Nb, Zr, Mo and C group is 60 mol% or less, and is composed of the balance Ti and inevitable impurities. Superelastic titanium alloy for living body. Contains one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, within a range indicated by 15 mol% ≦ 1.5x + y ≦ 45 mol% (x represents Nb content, y represents Ta content) Then, one or two kinds of Zr and Mo are contained in a range of 1 to 20 mol% Zr and 1 to 6 mol% in total, and 1 to 26 mol% in total, and Al, Ge, Ga, In, Sn, 1 to 10 mol% in total of 1 type or 2 types or more from B group consisting of Au, Ag, Pt, Pd, and 0.01 to about C group consisting of C, B, O, N, H, Si A bioelastic super-titanium alloy containing 1.0 mol%, further comprising a total amount of Ta, Nb, Zr, Mo, B group and C group of 60 mol% or less and comprising the remainder Ti and inevitable impurities. Contains one or two of Ta and Nb, which are β-phase stabilizing elements of titanium, within a range indicated by 15 mol% ≦ 1.5x + y ≦ 45 mol% (x represents Nb content, y represents Ta content) Then, one or two kinds of Zr and Mo are contained in a total of 1 to 14 mol% within the range of 1 to 10 mol% Zr and 1 to 4 mol%, and Al, Ge, Ga, In, Sn, 1 to 6 mol% in total of 1 type or 2 types or more from B group consisting of Au, Ag, Pt, Pd, and 0.01 to about C group consisting of C, B, O, N, H, Si A bioelastic super-titanium alloy containing 0.5 mol%, further comprising a total amount of Ta, Nb, Zr, Mo, B group and C group of 50 mol% or less and comprising the remainder Ti and inevitable impurities. A medical guide wire using the bioelastic super-titanium alloy according to any one of claims 1 to 9. An orthodontic wire using the superelastic titanium alloy for living body according to any one of claims 1 to 9. A stent using the living body superelastic titanium alloy according to any one of claims 1 to 9. A spectacle member using the superelastic titanium alloy for living body according to any one of claims 1 to 9. An endoscope actuator using the bioelastic super-titanium alloy according to any one of claims 1 to 9.

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