Retractable cannula for surgical procedures
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United States of America Patent
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Oct 30, 2012
Grant Date -
Mar 15, 2012
app pub date -
Sep 14, 2010
filing date -
Sep 14, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A cannula assembly having a plurality of outwardly-biased flexible fins capable of inward movement such that the fins converge upon insertion of a trocar device. The fins include a slot formed therein, with a corresponding raised feature on the trocar shaft capable of engaging the slots. Inward movement of the trocar within the cannula lumen causes the fins to converge. An additional embodiment utilizes outwardly-biased flexible fins that lock together in a closed position, with corrugated features in the fin inner surface that contact the trocar shaft such that, upon insertion of the trocar, the fins unlock and splay outward.
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