| 摘要 |
A vascular graft is made of a first expanded polytetrafluoroethylene layer, a support layer comprising at least a portion of a stent, wherein the support layer is placed around the first expanded polytetrafluoroethylene layer, and a second expanded polytetrafluoroethylene layer. The second expanded polytetrafluoroethylene layer comprises a plurality of circumferential bands spaced so that portions of the support layer are exposed. The second expanded polytetrafluoroethylene layer may secure the support layer to the first expanded polytetrafluoroethylene layer. The vascular graft may further comprise a third expanded polytetrafluoroethylene layer having a plurality of longitudinal strips of material. The second and third expanded polytetrafluoroethylene layers may secure the support layer to the first expanded polytetrafluoroethylene layer. The stent portion may comprise a plurality of ringed stents disposed about the first ePTFE section to define a ring stent, and the ringed stents may be formed in a zigzag pattern of alternating peaks and valleys. The vascular graft may be made of metal. <IMAGE> |
