US Patent 7169143 Methods for electrosurgical tissue treatment in electrically conductive fluid

An electrosurgical probe comprises a shaft having at least one electrode terminal at its distal end and a connector at its proximal end. The electrode terminal may be spaced from a return electrode such that when the electrode terminal is brought adjacent a tissue structure immersed in an electrically conductive fluid from outside the body, the electrically conductive fluid completes a conduction path between the electrode terminal and the return electrode. By applying high frequency electrical energy to the electrode terminal, target tissue may be cut or ablated while heat dissipation through low impedance paths, such as blood and normal saline, will be minimized. Related methods are disclosed.