Electrosurgical systems

A modular electrosurgical instrument for selectively providing electrosurgical energy to an energizable electrode, the instrument comprising:

• an interface module configured to issue one or more selected waveform command signals;
• a waveform generator module configured to deliver in response to the one or more waveform command signals, a corresponding one or more waveforms selected from a first waveform, a second waveform, and a third waveform, each of the first, second and third waveforms being different from the other of the first, second and third waveforms;
• a variable output voltage supply module configured to supply a selected electrical current to a corresponding output;
• an output driver module configured to combine at least one of the one or more waveforms with the respective selected electrical current to generate an electrosurgical current suitable for achieving the selected therapeutic result when applied to a treatment site on or in a patient by the energizeable electrode, wherein one or more of the interface module, the waveform generator module, the variable output voltage supply module and the output driver module is at least electrically decouplable from the other modules.