ePTFE graft with axial elongation properties
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United States of America Patent
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Jan 18, 2011
Grant Date -
Aug 19, 2004
app pub date -
Feb 11, 2004
filing date -
Jul 3, 2001
priority date (Note) -
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Abstract
A method of making an ePTFE tubular structure includes the steps of (a) forming a tube of polytetrafluoroethylene; (b) longitudinally stretching the polytetrafluoroethylene tube to form an expanded polytetrafluoroethylene tube, where the expanded polytetrafluoroethylene tube includes fibrils oriented in a longitudinal direction of the tube and nodes oriented in a circumferential direction of the tube; and (c) placing the expanded polytetrafluoroethylene tube circumferentially exterior to a longitudinal foreshortening and radially expanding mechanism, where radial pressure from the foreshortening mechanism radially expands the ePTFE tubular structure and reorients the fibrils non-longitudinally.
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