Extruded tubing and catheters having helical liquid crystal fibrils
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United States of America Patent
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Sep 28, 1993
Issued Date -
N/A
app pub date -
Aug 24, 1992
filing date -
Aug 4, 1989
priority date (Note) -
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Abstract
Extruded catheters and other flexible plastic tubing may be manufactured with improved rotational and/or longitudinal stiffness, compared with catheters made of more conventional plastics. A tubing of liquid crystal polymer plastic-containing material may be extruded through a tube extrusion die while rotating the inner and outer die walls to provide circumferential shear to the extruded tube. Thus the liquid crystal polymer is oriented in a helical manner to provide improved properties, including greater rotational stiffness.
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