Method for imparting improved fatigue strength to wire made of shape memory alloys, and medical devices made from such wire
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United States of America Patent
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Mar 1, 2016
Grant Date -
Jul 11, 2013
app pub date -
Feb 28, 2013
filing date -
Oct 31, 2008
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Abstract
Wire products, such as round and flat wire, strands, cables, and tubing, are made from a shape memory material in which inherent defects within the material are isolated from the bulk material phase of the material within one or more stabilized material phases, such that the wire product demonstrates improved fatigue resistance. In one application, a method of mechanical conditioning in accordance with the present disclosure isolates inherent defects in nickel-titanium or NiTi materials in fields of a secondary material phase that are resistant to crack initiation and/or propagation, such as a martensite phase, while the remainder of the surrounding defect-free material remains in a primary or parent material phase, such as an austenite phase, whereby the overall superelastic nature of the material is preserved.
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