An electrosurgery system includes an electrosurgery generator (10) coupled to or part of an electrosurgical instrument, the generator being operable to generate electrosurgical power in low frequency (typically at 1MHz) and high frequency bands (typically at 2.45GHz) either simultaneously or individually. The generator includes a load-responsive control circuit which, in one mode, causes power to be generated predominately at 1MHz when the load impedance is high and predominantly at 2.45MHz when it is low. This allows automatic switching between cutting and coagulation operation. In one embodiment, the instrument includes a gas plasma generator operating such that an ionisable gas is energised in a gas supply passage by the 2.45GHz component to form a plasma stream which acts as a conductor for delivering 1 MHz component to a tissue treatment outlet of the passage.
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