Patent ID: 8784477
Filing Date: 2014-07-22
Classification: A61F,A61L,C08L,Y10T

Abstract:
1. A vascular prosthesis comprising: a first flexible stent having a lattice structure with a compacted configuration and an expanded configuration; a second flexible stent inside the first flexible stent to form a tubular structure, the second flexible stent having a lattice structure with a compacted configuration and an expanded configuration; a first film layer of expanded polytetrafluoroethylene sandwiched between the first and second flexible stents; and a second film layer of expanded polytetrafluoroethylene sandwiched between the first and second flexible stents, the second layer having a higher rigidity and a lower plasticity than the first layer, wherein the first film layer and second film layer are circumferentially positioned from each other in a first circumferential position when the first and second flexible stents are in the compacted configuration and are circumferentially positioned from each other in a second circumferential position which is different from the first circumferential position when the first and second flexible stents are in the expanded configuration.