Prestressed cylindrical piezoelectric ultrasonic scaler
US4168447A · kind A · utility
27Cited by
8References
9Claims
0Family size
Inventors
Key dates
| Filing date | Apr 6, 1978 |
| Grant date | Sep 18, 1979 |
| Priority date | — |
| Expiry date | Apr 6, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23Q1/0036
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The scaler includes a transducer and an energizing circuit. The transducer includes a tubular piezoelectric transducer element which is maintained in compressive stress when energized by an axial tension bolt adapted to mount a vibratory work tool. The energizing circuit drives the transducer element at its resonant frequency and maintains resonant frequency within an optimum band width, despite changes in capacitive reactance of the transducer element produced by torque applied thereto as the work tool is pressed against an object. A fluid delivery system delivers fluid to the work tool via the tension bolt to effect scaling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.