Electrosurgical apparatus for cutting and coagulation

An electrosurgical apparatus comprising:

• an electrosurgical instrument having a distal tip assembly for delivering radiofrequency (RF) electromagnetic (EM) energy and microwave frequency EM energy into tissue;
• an electrosurgical generator arranged to generate radiofrequency (RF) electromagnetic (EM) energy and microwave frequency EM energy;
• and
• a feed cable connected to deliver the RF EM energy and the microwave frequency EM energy from the electrosurgical generator to the electrosurgical instrument;
• wherein the electrosurgical generator is configured to be operated in each of a coagulation mode and a cutting mode,
• wherein in the coagulation mode the electrosurgical generator delivers the RF EM energy and the microwave EM energy to the electrosurgical instrument simultaneously in a coagulation composite waveform comprising a high-power microwave signal and a low-power RF signal,
• wherein in the cutting mode the electrosurgical generator delivers the RF EM energy and the microwave EM energy to the electrosurgical instrument simultaneously in a cutting composite waveform comprising a high-power RF signal and a low-power microwave signal, wherein the low-power microwave signal is delivered from a distal tip at a low power level to denature and desiccate biological tissue, without coagulating biological tissue, and
• wherein in the coagulation composite waveform the low-power RF signal is delivered from the distal tip at a low power level to result in localized heating of biological tissue without generating microplasmas resulting in tissue cutting.