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US 5,788,626 AGranted
Method of making a stent-graft covered with expanded polytetrafluoroethylene
AssigneeSchneider (USA) Inc.
InventorPaul J. Thompson
Life of this patent
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Abstract
The expandable stent-graft generally defines a cylindrical lumen made from a stent having a discontinuous wall that is at least substantially covered with an expanded polytetrafluoroethylene material. The expanded polytetrafluoroethylene covering may be a biaxially oriented, expanded polytetrafluoroethylene material having nodules and longitudinal and circumferential fibrils or a uniaxially oriented, expanded polytetrafluoroethylene material. The expandable stent-graft expands and compresses in association with the stent structure as it is contracted and expanded.
Claims10
A method of making an expandable prosthesis comprising:
- (a) providing a self-expanding braided stent having a longitudinal orientation in an at least partially radially expanded state;
- (b) providing at least one layer of expanded polytetrafluoroethylene having a longitudinal orientation and a first average longitudinal inter-nodule distance in a free state;
- (c) longitudinally compressing the layer of expanded polytetrafluoroethylene so that the resulting longitudinally compressed layer has a second average longitudinal inter-nodule distance which is less than the first average longitudinal inter-nodule distance;
- and
- (d) affixing the longitudinally compressed layer of expanded polytetrafluoroethylene to the self-expanding braided stent in the at least partially radially expanded state such that the longitudinal orientations of the stent and layer of expanded polytetrafluoroethylene substantially correspond with one another.
2 more elements
Dependencies are inferred from the claim text.