Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1993-09-07
1995-10-03
Weiss, John G.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604164, 604264, A61M 5178
Patent
active
054547911
ABSTRACT:
The present invention relates to a trocar and method for penetrating body tissue. The trocar includes an obturator assembly and a cannula assembly. The obturator assembly has an obturator shaft with a distal end portion adapted to penetrate body tissue and at least one channel extending between a proximal end portion of the shaft and the distal end portion. A pressure indicating system is positioned at the proximal end of the shaft and is provided to respond to the passage of gases through the channel and provide a visual indication when the distal end has penetrated the body tissue. A safety system is associated with the obturator shaft and responsive to gas pressure to shield the distal end portion of the shaft after penetration of the body tissue.
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Derwin English Language Abstract of German Publication No. DT 2919-390 (Nov. 1980).
Autry Sidney D.
Tovey H. Jonathan
United States Surgical Corporation
Weiss John G.
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