Ultrasonic therapeutical apparatus
US4955366A · kind A · utility
27Cited by
5References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1988 |
| Grant date | Sep 11, 1990 |
| Priority date | — |
| Expiry date | Nov 15, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N2007/0078
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A ultrasonic therapeutical apparatus comprises a plurality of ultrasonic vibrators which are disposed in a plurality of concentric circular rows and defining a ultrasonic shock wave generator. The apparatus also includes control means for independently controlling the frequency and the phase with which the ultrasonic vibrators in the respective raws are driven as well as the output levels thereof, thereby allowing only a positive pressure of the resultant ultrasonic wave to be increased while suppressing a negative pressure thereof to eliminate a cavitation effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.