An implantable lead includes a lead body having a proximal end portion and a distal end portion with a connector located at the proximal end and an electrode located at the distal end. The pressurized gas supply assembly includes an inert gas output linked to the bottle via a dispensing nozzle secured within an opening of the bottle. A description of inputoutput blocks of the integrated circuit design is obtained. Here, the roughening of the surface of the polycrystalline zinc oxide film comprises wet-etching the polycrystalline zinc oxide film on the substrate using an etching solution mixed with nitric acid and hydrogen peroxide. Control menus for the base apparatus and the external input device can be displayed on the display apparatus. By oscillating between a negative and positive gain, a constant direct current output corresponding to the conductivity of the fluid between the first annular electrode and second annular electrode is provided.