Trocar cannula and catheter
First Claim
1. A catheter assembly comprising a sleeve having an inner and an outer surface, said sleeve having at least first and second annular grooves formed in said wall and being open to said inner surface and means connected to said grooves for providing a pressure differential therebetween wherein said means comprises a tube to each of said grooves and said tubes are connected to a source of gas.
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Accused Products
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.
49 Citations
11 Claims
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1. A catheter assembly comprising a sleeve having an inner and an outer surface, said sleeve having at least first and second annular grooves formed in said wall and being open to said inner surface and means connected to said grooves for providing a pressure differential therebetween wherein said means comprises a tube to each of said grooves and said tubes are connected to a source of gas.
- 2. A catheter assembly comprising a sleeve having an inner and an outer surface, said sleeve having at least first and second annular grooves formed in said wall and being open to said inner surface and including a tube connected to each of said grooves for providing a pressure differential therebetween.
Specification