Bipolar electrosurgical system

Medical probe assembly for supplying power to the body of a patient, the assembly comprising the probe (106): an elongate (184) element having a distal region (190) and a proximal region (160); a device (192) power supply associated with said distal portion (190) of said elongated element (184), said device power supply hole (450) inside which a cooling fluid flows supplied to the orifice ( 450) for cooling the power supply device being used; and protruding beyond that part of the power supply defining the orifice (450) temperature sensor (402), wherein the resulting projection is a component of both the temperature sensor as the device power supply , so that energy can be conducted from the projection and the projection provided to the surrounding tissue.