A superelastic or Shape Memory Article

摘要

An endoprosthetic device including at least one structural member formed from a fatigue-resistant superelastic or shape-memory alloy, the fatigue-resistant superelastic or shape-memory alloy having an increased fatigue life that is superior to known nickel-titanium alloys. The minimum fatigue life may be due, at least in part, to the nickel-titanium alloy having at least one of an oxygen concentration of less than 50 ppm, a carbon concentration of less than 50 ppm. The superelastic or shape-memory nickel-titanium alloy of the core region comprises substantially only austenite. Articles manufactured from such fatigue-resistant nickel-titanium alloys can be more durable because they are more resistant to repetitive strain and crack propagation.