a method for selectively bonding layers of polymeric material , especially expanded polytetrafluoroethylene , to create endoluminal vascular devices . in a preferred method the selective bonding is achieved by applying pressure to selected areas using a textured mandrel . this permits a stent device to be encapsulated between two layers of eptfe with unbonded slip pockets to accommodate movement of the structural members of the stent . this allows stent compression with minimal force and promotes a low profile of the compressed device . unbonded regions of eptfe allow enhanced cellular penetration for rapid healing and can also contain bioactive substance that will diffuse through the eptfe to treat the vessel wall .