ePTFE graft with axial elongation properties

Details ePTFE graft with axial elongation properties ePTFE graft with axial elongation properties

2011-01-18

2011-01-18

Johnson, Christina (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

Reexamination Certificate

active

07871550

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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