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Method for transferring improved fatigue strength to wire made of shape memory alloy and medical device made from such wire
Method for transferring improved fatigue strength to wire made of shape memory alloy and medical device made from such wire
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机译:将改善的疲劳强度转移到形状记忆合金制成的线材的方法以及由该线材制成的医疗器械
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摘要
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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