Abstract: A system is disclosed for stimulating body tissue includes one or more leadless, battery-less, implantable electrodes; and an external controller configured to transmit energy to the implantable electrode(s) via an RF signal for generating tissue stimulating pulses emitted by the respective electrode(s). The external controller is preferably further configured to transmit identification information to the implantable electrode(s) for secured information exchange. The one or more implantable electrodes are preferably each configured to transmit sensed tissue information to the external controller via an RF signal. The system may employ fixation technologies such as screw-in mechanisms, stent-like scaffolding, cuff-type or anchoring mechanisms in order to attach the implanted electrode(s) to respective target body tissues, such as (without limitation) cardiac tissue, brain tissue, bladder tissue, diaphragm, nerve tissue, spine, digestive tract tissue, and muscle tissue.