An implantable stimulation electrode lead for medical purposes includes a coaxial lead structure with an inner supply lead and an outer supply lead electrically insulated from the inner supply lead, and first and second electrodes which are provided at or near the distal end of the lead structure. Spherical or hemispherical grains are formed on the surface of an amorphous silicon film containing phosphorus which forms a bottom electrode of a capacitor. The printed circuit board assembly also includes at least one shield layer located between the outer surfaces. The controller unit receives the controller command signal through the server unit, wherein the server unit does not need to know the internet protocol addresses of the sensor unit, the user interface unit, and the controller unit ahead of time to be able to successfully transmit the data message and the controller command message.