Titanium alloy

Patent metadata

Field	Value
Publication number	US-9752214-B2
Application number	US-201213983005-A
Country	US
Kind code	B2
Filing date	Jan 31, 2012
Priority date	Jan 31, 2011
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A titanium alloy includes 15 to 27 atomic % (at %) of tantalum (Ta) and 0 to 8 at % of tin (Sn), the balance being titanium (Ti) and unavoidable impurities, when the entire amount of the titanium alloy is taken as 100 at %. Therefore, the titanium alloy provided has characteristics suitable for medical device materials, biocompatible materials, etc.

First claim

The invention claimed is:

1. A titanium alloy for a living body, consisting of:
15 to 27 atomic % (at %) of tantalum (Ta); and
1 to 8 at % of tin (Sn) with the balance being titanium (Ti) and unavoidable impurities, when an entire amount of the titanium alloy is taken as 100 at %;

wherein the titanium alloy has a Young's modulus of 40 Gpa or lower and a tensile strength of 800 MPa or larger and
a value obtained by dividing the total atomic % of the tantalum and the tin by the total atomic % of the titanium and the unavoidable impurities is within a range of 0.34 to 0.36 within which the titanium alloy has both at once a maximum tensile strength and a minimum Young's modulus.

2. The titanium alloy according to claim 1 , wherein a saturation magnetic flux density in a B-H curve obtained by a VSM method is 5.0×10 −4 T (tesla) or lower when a strength of a magnetic field is 4.0×10 5 A/m.

3. The titanium alloy according to claim 1 , having an elastic deformation strain of 1.0% or larger.

4. The titanium alloy according to claim 1 , wherein in a three-point bending test performed under measurement conditions in which a distance between two supporting members is 20 mm and a diameter d of a pointed end of each of the supporting members and a pressing member is 5 mm, when the pressing member presses the titanium alloy formed into a wire having a diameter φ of 0.5 mm to a pressing depth of 4 mm at a pressing rate of 1 mm/minute and then a load is released, an amount of recovery of the wire is 60% or higher.

5. The titanium alloy according to claim 1 , wherein a degree of cell injury when a metal ion concentration measured by ICP emission spectrometry is 64 ppm or less is less than 10%.

6. The titanium alloy according to claim 1 , wherein the titanium alloy is formed into a medical guidewire, a medical delivery wire, a medical stent, a medical clip, an aneurysm embolization coil or a vein filter, or a dental cleanser, a dental reamer, a dental file or an orthodontic wire.

7. The titanium alloy according to claim 6 , having a maximum outer diameter of 0.005 mm to 1 mm.

8. The titanium alloy according to claim 1 , wherein the tantalum content is 22 to 24 at %.

Assignees

• Takeguchi Shunsuke
• Ishikawa Yoshiki
• Kubo Takasumi
• Ishida Shin
• Takahashi Hiroki
• Morita Masafumi
• Miki Masahito
• Nippon Piston Ring Co Ltd
• Nat Univ Corp Saitama Univ

Inventors

• Takeguchi Shunsuke
• Ishikawa Yoshiki
• Kubo Takasumi
• Ishida Shin
• Takahashi Hiroki
• Morita Masafumi
• Miki Masahito

Classifications

• C22F1/183

  of titanium or alloys based thereon · CPC title

• A61L27/06

  Titanium or titanium alloys · CPC title

• A61L31/022

  Metals or alloys · CPC title

• C22C27/02

  Alloys based on vanadium, niobium, or tantalum · CPC title

• C22C14/00 Primary

  Alloys based on titanium · CPC title