A high density microwall ePTFE structure and a method for making, involving the manipulation of a standard extruded ePTFE graft. The final product has the desired characteristics of high density, reduced wall-thickness, above-average radial strength and enhanced suture retention....http://www.google.com.tw/patents/US7226558?utm_source=gb-gplus-share專利 US7226558 - Method of making an expanded polytetrafluoroethylene structure
