FLEXIBLE STENT-GRAFT DEVICE HAVING PATTERNED POLYMERIC COVERINGS

摘要

The present invention provides 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 continuous and seamless ePTFE tubular covering having a node and fibril structure securably disposed to at least one of the stent surfaces, the graft covering composing at least two laminated layers, wherein the laminated layers include at least one region where the laminated layers are not securely bonded; and the at least one regioTs has a different bending flexibility from the tubular graft covering.