Expandable obturator and catheter assembly including same
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United States of America Patent
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-
May 14, 1991
Issued Date -
N/A
app pub date -
Sep 20, 1989
filing date -
Jun 21, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An oburator includes a solid substantially stiff rod of a nonhydrophilic polymer coated with a layer of a hydrophilic polyurethane which may have an antithrombogenic agent bulk distributing therein. When the hydrophilic polyurethane comes into contact with an aqueous liquid such as water, saline or a body fluid, it absorbs the liquid and expands thereby enlarging the diameter of the obturator. Another aspect of the invention is an assembly of a catheter and the obturator of the invention. When the obturator is emplaced in the catheter and brought into contact with a liquid, it expands, releases the antithrombogenic agent and contacts the lumen wall of the catheter thereby forming a seal which prevents backflow of a body fluid.
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