An electrosurgical unit which provides a voltage output to a load. An oscator in the unit produces the output of a given frequency. A switching circuit coupled to the oscillator provides an unmodulated RF carrier from the oscillator for use in cutting procedures and a pulse modulated RF voltage from...http://www.google.de/patents/US4092986?utm_source=gb-gplus-sharePatent US4092986 - Constant output electrosurgical unit
