Shape-memory alloy constructed without nickel.

A titanium-based alloy is made without nickel to increase its manufacturability and reduce concerns about biocompatibility. The material, produced by Memry Corp. (Bethel, CT; 203/739-1100), offers elasticity in applications for which allergies prohibit the use of conventional shape-memory metals. It is also easy to weld and join, and it has a strain recovery of 3.5%. The material can be used for orthodontic devices, implantable surgical devices, and nonimplantable surgical devices. Because it is biocompatible and more elastic than regular titanium, it can be used to make orthopedic devices as well.