An endoprosthesis includes a body defining a flow passage therethrough. The body is capable of maintaining patency in a blood vessel and includes iron or an alloy thereof. The body has a nano-structured surface comprising iron oxide in which the individual nano-structures have a height to thickness aspect...http://www.google.com.au/patents/US7998192?utm_source=gb-gplus-sharePatent US7998192 - Endoprostheses
