Patent ID: 7828833
Filing Date: 2010-11-09
Classification: A61F,A61L

Abstract:
1. A composite multilayer implantable structure comprising: a first inner tubular layer and second outer tubular layer formed of expanded polytetrafluoroethyene having a porous microstructure defined by nodes interconnected by fibrils, said first and second layers each seamless and substantially fluid-tight, said first and second layers each formed from a green fluoropolymer tube characterized by a generally uniform thickness being in the range of up to about 250 μm, said first and second layers having a support structure positioned there between, wherein said first layer is a blood contacting layer; a third tubular layer formed of textile material circumferentially disposed exteriorly to said first and second layers, wherein said third tubular layer is a tissue contacting layer; and an elastomeric bonding agent layer with a Shore Hardness of about 75 to 85A, said layer consisting essentially of a material selected from the group consisting of polycarbonate urethanes, styrene-isobutylene block copolymers, and combinations thereof, applied to cover one of said second layer or third layer and disposed within the pores of said microstructure to seal punctures, and for securing said second layer to said third layer; wherein said first, second, and third tubular layers form an elongate vascular graft.