ELECTROSURGICAL RESECTOR TOOL

An electrosurgical resector tool for cutting, coagulating and ablating biological tissue. The tool has an instrument tip comprising first and second jaws; wherein the second jaw is movable relative to the first jaw between a closed and open position. The first jaw comprises a first pair of electrodes electrically isolated from one another, the first pair of electrodes comprising an inner and outer electrode, and the second jaw comprising a single electrode. The first pair of electrodes is operable as active and return electrodes for delivering RF EM energy, and the single electrode is operable as an active electrode when the inner electrode of the first jaw is operable as a return electrode, or as a return electrode when the inner electrode of the first jaw is operable as an active electrode. The instrument tip is also operable as a microwave field emitting structure for emitting microwave EM energy.