Trocar cannula and catheter
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United States of America Patent
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-
Apr 5, 1994
Grant Date -
N/A
app pub date -
Sep 29, 1992
filing date -
Sep 29, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A TROCAR catheter assembly employs a regulated gas flow between a catheter and the inner wall of a cannula sleeve in which the catheter moves. Annular grooves are formed in the wall of the sleeve and the grooves are connected to a source of gas which produces a pressure differential which causes gas to flow in a manner to control passage of gas to or from a body cavity in which the sleeve is inserted. In one embodiment, one of the annular grooves is connected to a bladder which is inflated to seal the entire opening defined by the inner wall of the sleeve when the catheter is absent.
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