Method for detecting transverse mode vibrations in an ultrasonic hand piece/blade
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United States of America Patent
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Jul 8, 2003
Grant Date -
Nov 21, 2002
app pub date -
May 21, 2001
filing date -
May 21, 2001
priority date (Note) -
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Abstract
A method for detecting transverse mode vibrations in an ultrasonic hand piece/blade for determining the existence of unwanted vibration in the hand piece/blade. A tracking filter centered at the drive frequency of the generator, is used to monitor the drive frequency of the ultrasonic generator and attenuate the drive signal when it exceeds a predetermined level. The tracking filter has a wide pass band. Alternatively, a tracking filter having a pass band which is divided into several regions is used to avoid other longitudinal resonances, such as a resonance at a second harmonic, or other spectral features that would otherwise detract from the tracking accuracy of the filter.
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