US Patent RE39358 Electrosurgery system and method

An electrosurgical generator has output terminals for connection to active and return electrodes respectively of an electrosurgical instrument and, connected to the output terminals via at least one isolation capacitor, a radio frequency (r.f.) source which may be pulsed by a pulsing circuit. To permit tissue removal at a high rate, the source and the pulsing circuit are arranged so as to generate a pulsed r.f. output signal having a peek-to-peek voltage of at least 1250V, a mark-to-space ratio not more than 1:1, and a pulse length not more than 100 μs.