The material may be superelastic, such as NITINOL, and the method may include bending the 2-D blank into the 3-D form...http://www.google.com/patents/US7137184?utm_source=gb-gplus-sharePatent US7137184 - Continuous heart valve support frame and method of manufactureAdvanced Patent SearchPublication numberUS7137184 B2Publication typeGrantApplication numberUS 10/423,019Publication dateNov 21, 2006Fi