Fluid cooled surgical apparatus

surgical apparatus, comprising: a tubular member defining a distal end and a proximal end; at least one energy transmission device supported on said tubular member; one fluid supply line; and a cooling apparatus supported on the tubular element relative tissue at least to a transmission power such that a transmission gap conductive fluid in intermediate arrangement is defined having a fluid inlet connected to the line fluid supply, wherein the apparatus further comprises a drainage tube fluid, and because space transmission conductive fluid further has a fluid outlet connected to drain fluid, so that, in use, a conductive region between the inlet and the fluid outlet is set.