Abstract: Various embodiments provide an electrosurgical resector tool comprising: a shaft defining a lumen; an energy conveying structure for carrying electromagnetic (EM) energy through the lumen of the shaft; an instrument tip mounted at a distal end of the shaft. The instrument tip comprises: a static portion comprising a first blade element; and a movable portion comprising a second blade element, wherein the movable portion is movable relative to the static portion between a closed position in which the first blade element and second blade element lie alongside each other to an open position in which the second blade element is spaced from the first blade element by a gap for receiving biological tissue. The instrument tip also includes a travel limiting mechanism operable to limit a maximum extent of relative movement between the second blade element and the first blade element in the open position and/or the closed position.

Abstract: The invention provides an electrosurgical instrument for delivering radiofrequency and microwave energy to biological tissue in order to cut and coagulate the tissue. The electrosurgical instrument comprises a coaxial transmission line for conveying radiofrequency (RF) energy and microwave energy, and an energy delivery tip coupled to a distal end of the coaxial transmission line. The energy delivery tip comprises: a first electrode electrically coupled to an inner conductor of the coaxial transmission line and protruding beyond a distal end of an outer conductor of the coaxial transmission line; a second electrode electrically coupled to the outer conductor of the coaxial transmission line and extending coaxially along a portion of the first electrode; and a dielectric body disposed between the first electrode and second electrode. The first electrode comprises a projecting nib that protrudes beyond a distal end of the dielectric body.