Method for detecting a loose blade in a hand piece connected to an ultrasonic surgical system
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United States of America Patent
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-
Mar 25, 2003
Grant Date -
Apr 25, 2002
app pub date -
May 31, 2001
filing date -
Oct 20, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for detecting loose blades in a hand piece connected to an ultrasonic surgical system by performing frequency sweeps of a drive signal through a range which includes the resonance of a hand piece/blade system and the resonance of the hand piece without a blade attached. The frequencies of resonance in each sweep are compared. If a substantial difference between the frequency sweeps occurs, then a 'Tighten Blade' message is displayed on a liquid crystal display on an ultrasonic generator console. The method permits rapid and easy diagnosis of loose blade connections. The method also assists a surgeon or nurse in knowing when to tighten the blade, as opposed to performing more lengthy and detailed diagnostic or cleaning procedures. In addition, the time and costs associated with the diagnostic procedures to isolate faults are eliminated because, upon determining that the blade is not loose, the surgeon and/or nurse can request a new blade based on the assumption that the blade is broken.
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