Process for manufacturing three-dimensional braided covered stent
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United States of America Patent
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Feb 17, 1998
Grant Date -
N/A
app pub date -
Apr 30, 1996
filing date -
Apr 30, 1996
priority date (Note) -
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Abstract
A process is disclosed for making a prosthesis for intraluminal implantation. The prosthesis has a flexible tubular three-dimensionally braided structure of metal or polymeric monofilaments, and polymeric multifilament yarns. The prosthesis can be elastically deformed to reduce its diameter through axial elongation. The monofilaments and multifilament yarns are interbraided into axially spaced apart helices, concentric on a common central axis of the prosthesis. The monofilaments 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 are arranged to impart to the prosthesis its nominal shape and resilience. The textile strands are braid into one or more layers of sheeting that reduce permeability and thereby enhance the utility of the prosthesis as a vascular graft. In an alternative embodiment cold-working process elastically and plastically deformable monofilaments are plastically deformed about shaping pulleys, then three-dimensionally braided to form the prosthesis.
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