An electrosurgical apparatus for coagulating tissue through an endoscopic tube comprises an elongated flexible tube having a proximal end and a distal end and defining a longitudinal axis, the tube including a sleeve being selectively extendable therethrough. The sleeve includes a distal end being movable from a first position wherein the distal end is disposed in a generally rectilinear fashion relative to the tissue to a second position wherein the distal end directs pressurized ionizable gas flowing through the sleeve at an angle Sx with respect to the longitudinal axis wherein the angle of the distal end of the sleeve relative to the longitudinal axis progressively changes proportionally to the distance that the distal end of the sleeved extends from the tube. At least one electrode is mounted proximal to the distal end of the sleeve for ionizing pressurized ionizable gas.
