Method for making ePTFE and structure containing such ePTFE, such as a vascular graft
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United States of America Patent
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Apr 28, 2009
Grant Date -
Jul 6, 2006
app pub date -
Dec 31, 2004
filing date -
Dec 31, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for making a vascular graft includes providing a PTFE green tube extrudate which is un-sintered, and then initially expanding the un-sintered extrudate to produce an initial node and fibril micro-structure therein. This is followed by heating the extrudate to raise the temperature thereof for a time period of sufficient duration such that the extrudate is partially sintered. The partially sintered extrudate is subsequently expanded to make the vascular graft. The subsequent expansion produces a subsequent node and fibril micro-structure in the vascular graft. An alternative method for making a vascular graft includes providing a PTFE green tube extrudate which is un-sintered, longitudinally expanding the un-sintered extrudate to form an ePTFE tube structure, and radially expanding the un-sintered ePTFE tube structure. ePTFE made according to the method is fabricated into various structures, such as tube structures, filament structures, and sheet structures.
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