A medical system, including a catheter body, an elongate body disposed in the catheter body an expandable element having a proximal portion coupled to the catheter body and a distal portion coupled to the elongate body, the distal portion of the expandable element defining the distal-most portion of the medical device a mesh or array of longitudinal splines substantially surrounding the expandable element, at least a portion of the mesh or splines being electrically conductive and a coolant source in fluid communication with the expandable element.
