Extruded tubing and catheters having increased rotational stiffness
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United States of America Patent
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Oct 20, 1992
Grant Date -
N/A
app pub date -
Jul 10, 1991
filing date -
Jul 10, 1991
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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