| 摘要 |
A prothesis for transluminal implantation consists of a flexible tubular theree-dimensionally braided structure of metal or polymeric monofilaments, and polymeric multifilament yarns. The prothesis can be elastically deformed to reduce its diameter through axial elongation. The monofilaments and multifilament yarns are arranged in axially spaced apart helices, concentric on a common central axis of the prothesis. The monofilament are selectively shaped before their interbraiding with the multifilament yarns, either by an age-hardening or other heat-setting stage, or a cold-working stage that controllably plastically deforms the strands. The shaped structural strands cooperate to impart to the prothesis its nominal shape and resilience. The textile strands cooperate to provide one or more layers of sheeting thar reduce permeability and thereby enhance the utility of the prothesis as a vascular graft. An alternative embodiment prothesis includes elastically and plastically deformable structural strands, selectively plastically deformed by cold working, then three-dimensionally braided to form the prothesis. |
