Expandable cannulas
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United States of America Patent
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-
Feb 11, 1997
Issued Date -
N/A
app pub date -
Apr 4, 1995
filing date -
Feb 4, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Cannulas for surgical and medical use expand along their entire lengths. The cannulas are inserted through tissue when in an unexpanded condition and with a small diameter. The cannulas are then expanded radially outwardly to give a full-size instrument passage. Expansion of the cannulas occurs against the viscoelastic resistance of the surrounding tissue. The expandable cannulas do not require a full depth incision, or at most require only a needle-size entrance opening.
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