ELECTROSURGERY SYSTEM

摘要

An electrosurgery system for electrosurgically cutting or vaporising living tissue comprises an electrosurgical generator (10) having a pair of output terminals and an electrosurgical instrument (12) containing an electrode assembly (16). The electrode assembly has at least one treatment electrode (16A) and an adjacent return electrode (16B). the generator and the assembly are arranged to deliver to the treatment and return electrodes radio frequency (r.f.) energy simultaneously at at least two frequencies, one of which is in a lower frequency range of from 50kHz to 50MHz and the other of which is greater than 300MHz. The r.f. current delivered at the lower frequency is limited in order to restrict dissipation of power in the tissue at that frequency and to permit tissue cutting or vaporisation using energy delivered at the higher frequency.