Patent ID: 7517349

Claim:
A catheter comprising an elongate flexible member configured for endoluminal navigation with a working end having an electrosurgical surface including a material having a positive temperature coefficient of resistance (PTCR), and an electrical source operatively coupled to the electrosurgical surface; wherein the working end of the flexible elongate member comprises a tubular member defining an internal lumen; wherein the tubular member is moveable between a first, non-expanded, configuration in which the tubular member is generally straight and the internal lumen extends along a longitudinal axis of the catheter, and a second, expanded configuration in which the tubular member forms a helix such that the internal lumen does not extend along the longitudinal axis but is instead coiled around it; wherein the PTCR material of the electrosurgical surface is configured for direct contact with bodily tissue wherein the PTCR material is adapted to transmit electrical energy directly to bodily tissue.