ABLATION PROBE AND LUMEN FOR IMPROVED ACCESS AND FLOW

An apparatus and method provide for the delivery of an ablation treatment by supplying a control signal to supply electrode of an ablation device disposed at the distal end portion of an elongated shaft. A lumen extends along a longitudinal axis of the shaft. The supply electrode forms an electrode face laterally directed from the longitudinal axis and through which an aperture extends in connection with the lumen. The electrode face forms an ovular shape having a first major axis that extends parallel to the longitudinal axis. An insulator separates the supply electrode from a return electrode, and a transition passage of the lumen extends though the insulator along an arc-shaped path.