Patent ID: 8292887
Filing Date: 2012-10-23
Classification: A61B

Abstract:
1. A method of treating nerve-sensitive tissue within a body structure, comprising: positioning a distal end portion of an electrosurgical instrument in close proximity to the body structure, the distal end comprising an active electrode and a return electrode, wherein the active electrode comprises a tissue-contacting surface on the distal end portion, and the return electrode is recessed within the distal end portion; applying a radio frequency voltage across the active and return electrodes in the presence of an electrically conductive fluid such that electric fields are generated between the active electrode and the return electrode, wherein the voltage is sufficient to generate plasma on the active electrode, and wherein the electric fields are directed within a chamber defined between the active electrode and the return electrode; electrically connecting the return electrode to a conductive cap having an exposed surface and disposed at a distal end of the instrument; sufficiently spacing the conductive cap from the active electrode, thereby minimizing generation of an electric arc between the active electrode and the conductive cap; aspirating fluid and tissue fragments along a selected length of the instrument, wherein the selected length comprises a first portion and a second portion; and contacting the tissue with the plasma.