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Abstract

A system and method for surface tissue ablation on the patient's outer skin, such as the epidermis or the underlying dermis. An electrosurgical probe 130) comprises a shaft 132) having an array of active electrodes 136) on its distal tip and a connector 134) at its proximal end for coupling the electrode array to a high frequency power supply. An electrically conducting liquid is directed along a fluid flow path 142) past a return electrode surface 138) to the target site to provide a current flow path between the target site and the return electrode. High frequency voltage is then applied to the active and return electrodes so that an electric current flows from the active electrode, through a layer of vapor formed at the tip of the electrode, and to the return electrode through the current flow path provided by the electrically conducting liquid. The high frequency voltage will preferably be sufficient to establish high electric field densities between the active electrode array and the epidermal tissue to thereby induce molecular breakdown or disintegration of several cell layers of the tissue.

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First Claim