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US 6,524,334 B1Granted
Expandable 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 wail 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.
Claims5
An expandable stent-graft comprising:
- (a) a braided self-expanding stent characterized by a longitudinal shortening upon radial expansion from a first longitudinal stent length to a second longitudinal stent length;
- and
- (b) at least one tubular layer of biaxially oriented expanded polytetrafluoroethylene comprising nodules and fibrils affixed to the stent characterized by a shortening of average longitudinal inter-nodule distance upon radial expansion from a first average longitudinal inter-nodule distance to a second average longitudinal inter-nodule distance and having (i) a first average longitudinal inter-nodule distance of between about 50 and about 150 microns, and (ii) a second average longitudinal inter-nodule distance of between about 0 and about 50 microns;
- wherein the ratio of first longitudinal stent length to second longitudinal stent length is within about 25 percent of the ratio of first average longitudinal inter-nodule distance to a second average inter-nodule distance.
1 more element
Dependencies are inferred from the claim text.