Apparatus for manufacturing expanded polytetrafluoroethylene products
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United States of America Patent
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-
Mar 11, 2003
Grant Date -
N/A
app pub date -
Jun 16, 2000
filing date -
Mar 10, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method and apparatus is provided for extruding ePTFE tube for use in medical applications. A tube of PTFE is extruded, preferably in an extrusion process, using counter-rotated die components. The die component is maintained at a constant temperature during processing. The resulting green tube has enhanced fibrous state formation in a direction perpendicular to the direction of extrusion. The PTFE green tube is then subjected to secondary operations such as stretching and expansion to yield medical product. The ePTFE tube structure is defined by nodes interconnected by elongate fibrils. Both the nodes and fibrils are substantially randomly tilted with respect to the longitudinal axis of the tube. This particular structure yields a tube which exhibits a high degree of radial tear strength useful in medical applications.
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