Diathermy apparatus
US4069827A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1975 |
| Grant date | Jan 24, 1978 |
| Priority date | — |
| Expiry date | Aug 20, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/40
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A diathermy apparatus includes a power oscillator for developing signals which are coupled to a patient by a tuned reactive coupling circuit. The magnitude of the oscillator signal is detected in the oscillator output circuit, and a corresponding control signal is developed. A reference signal is supplied by an output level selection circuit. The load imposed by the patient and the output circuit upon the power oscillator, and thus the magnitude of the oscillator signal, are maintained substantially constant by a servo control circuit. A motor driven variable impedance in the reactive coupling circuit is operated in response to differences between the control and reference signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.