A stent comprises at least one segment. The segment comprises a first tubular closed ring section, a second tubular closed ring section, a first generally helical section having a first end and a second end, and a second generally helical section having a first end and a second end. The first ends of...http://www.google.es/patents/US7637939?utm_source=gb-gplus-sharePatente US7637939 - Hybrid stent
