Systems and methods for screen electrode securement

A method for treating a target tissue whereby a portion of the target tissue is removed, comprising the steps of:

• advancing a probe comprising a proximal end, a shaft, a distal end portion, a substantially flat active screen electrode, and an insulative support member, the screen electrode supported by the support member and secured on the distal end portion of the probe such that the screen electrode is positioned in close proximity to the target tissue, and wherein the screen electrode is electrically coupled and mechanically secured to the support member by first and second bilateral securing electrodes such that an active electrode assembly is formed, wherein the first and second bilateral securing electrodes have end portions extending through and engaging the support member, said probe further comprising at least one electrical connector extending through the shaft and terminating proximal to the end portions of the first and second bilateral securing electrodes;
• delivering an electrically conductive fluid to the target tissue;
• applying a high frequency voltage between the active electrode assembly and a return electrode sufficient to generate a plasma between the first and second bilateral securing electrodes and the screen electrode;
• and
• whereby the plasma ablates target tissue at a target site.