Expansible cannula
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United States of America Patent
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-
Aug 18, 1992
Grant Date -
N/A
app pub date -
Feb 13, 1991
filing date -
Feb 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention provides an expansible cannula (particularly useful as a trocar) comprising essentially a conical tube made of metal foil with its proximal end located in a holder, and an expander tube which can be pushed through the stem from the proximal end, to cause the stem to expand from its conical free condition to a distended cylindrical condition. The stem itself comprises a caudex which has only radial motion on expansion of the stem, and a leaf, which in addition to uncoiling on expansion of the stem is also permitted a degree of forward motion, so that the front end of the stem becomes circular in the opened condition.
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