A stent arrangement which has at least a first ring (3) and zig zag struts (5) extending axially from the periphery of the ring. There can be first and second rings (3, 4) axially spaced apart and defining substantially parallel planes and a plurality of zig zag portions (5) between the first and second...http://www.google.fr/patents/US8043357?utm_source=gb-gplus-shareBrevet US8043357 - Ring stent
