Patent ID: 8062346
Filing Date: 2011-11-22
Classification: A61F,A61L

Abstract:
1. An endoprosthesis comprising: a radially distensible, tubular stent comprising opposed open ends and a stent wall structure having opposed exterior and luminal surfaces; and a seamless tubular covering secured to one of said stent surfaces and extending in a longitudinal direction, said seamless tubular covering comprising laminated PTFE having a node and fibril structure, wherein the laminated PTFE comprises at least two laminated layers wherein said laminated layers include at least one region where a first laminated layer has a plurality of dimples and the first laminated layer is not securely bonded to a second laminated layer, said at least one region having a different bending flexibility from regions where the first laminated layer is securely bonded to the second laminated layer.