ELECTROSURGICAL INSTRUMENT

An electrosurgical instrument for delivering pressurised fluid to a biological tissue, and for delivering radiofrequency electromagnetic energy and/or microwave frequency EM energy to the biological tissue. The electrosurgical instrument comprises a flexible shaft with an instrument tip connected to its distal end. The instrument tip comprises a planar body made of a first dielectric material separating a first conductive element from a second conductive element, for delivering EM energy to the biological tissue. The instrument tip has a nozzle for delivering the pressurised fluid directly to the biological tissue. An outer sleeve extends over the flexible shaft and a proximal section of the instrument tip to reinforce the flexible shaft and a junction between the flexible shaft and instrument tip.