Method for making tubing
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United States of America Patent
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Apr 22, 1997
Issued Date -
N/A
app pub date -
Jun 2, 1995
filing date -
Apr 20, 1994
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A method for making differential stiffness tubing for medical products, such as catheters. The method produces a tubing that has a stiff section and a flexible section joined by a relatively short transition section in which the materials of the stiff and flexible sections are wedged into each other in a smooth gradual manner to produce an inseparable bond between the materials without abrupt joints. The method also employs a resin modulating system that minimizes the length of the transition section by minimizing the volumes in all flow channels of the co-extrusion head used to produce the tubing.
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