发明名称 |
METHOD FOR DETECTING TRANSVERSE MODE VIBRATIONS IN AN ULTRASONIC HAND PIECE/BLADE |
摘要 |
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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申请公布号 |
CA2386633(C) |
申请公布日期 |
2011.04.19 |
申请号 |
CA20022386633 |
申请日期 |
2002.05.16 |
申请人 |
ETHICON ENDO-SURGERY, INC. |
发明人 |
GIORDANO, JAMES R.;STULEN, FOSTER B. |
分类号 |
A61B18/00;G01H11/06;A61B17/00;A61B17/32 |
主分类号 |
A61B18/00 |
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