Method for detecting transverse mode vibrations in an ultrasonic hand piece/blade
US6588277B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2001 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | May 21, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02881
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.