Multifilament nickel-titanium alloy drawn superelastic wire
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
Mar 17, 1998
filing date -
May 2, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A highly flexible cable includes two, and preferably three or more strands of nickel-titanium alloy wire which are twined (twisted) to form a wire rope. The nickel-titanium alloy wire rope is drawn through successive dies to reduce its diameter until the outer surface of the cable is substantially smooth, the cross section of the cable is substantially circular, and the overall diameter of the wire rope is reduced by 20-50%. The cable is then annealed to remove the effects of cold working. The resulting cable has been found to have an improved flexibility (i.e., a lower modulus of elasticity) relative to single strand nickel-titanium wires of the same diameter.
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