US Patent 9050181 Ring stent

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 ring portions around the periphery thereof. The stent can be formed from a single wire or laser cut from a cannula and can be covered or uncovered.