Shape memory material and method of making the same
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United States of America Patent
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Dec 11, 2007
Grant Date -
Dec 30, 2004
app pub date -
Apr 19, 2004
filing date -
Apr 18, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates generally to a shape memory and/or super-elastic material, such as a nickel titanium alloy. Additionally or alternatively, the present invention relates to a super-elastic or pseudo-elastic material that has an initial transition temperature A.sub.f above a body temperature. The shape memory material can have a super-elasticity or pseudo-elasticity property at a temperature below the initial transition temperature A.sub.f of the material. For example, the shape memory material can have its workable temperature for producing super-elasticity or pseudo-elasticity of about 0.degree. C. to 15.degree. C. below the initial transition temperature A.sub.f. The shape memory material can be malleable at a room temperature, and become super-elastic or pseudo-elastic at a body temperature. In addition, the present invention relates to a method of making a shape memory or a super-elastic material. The treatment protocols can include but not limited to thermo-mechanical, thermo-mechanical, radiation, and ternary alloying treatments.
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