Nitinol shape memory alloy is composed of nearly equal atomic nickel and titanium (i.e. 50:50 at% nickel and titanium), with excellent superplastic and shape memory properties, as well as excellent characteristics of biocompatibility, wear resistance, corrosion resistance, high damping, etc., thus becoming a key material in the field of vascular, orthopedics, spine, urology and dentistry. Applications range from neurovascular stents and heart valve frames to orthopedic nails and disposable suture threading devices.