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...http://www.google.fr/patents/US7871550?utm_source=gb-gplus-shareBrevet US7871550 - ePTFE graft with axial elongation properties
