Implantable systems are described that include a stimulation device positionable in vivo and configured to communicatively couple to electrodes configured to stimulate or block body tissue and an auxiliary device positionable in vivo and including one or more coils configured to wirelessly couple, in vivo, to the stimulation device and to wirelessly couple to an ex vivo device. The auxiliary device may include a coil driver and a power source controlled by a processor and memory for storing data instructions for the coil driver and for storing data received from the stimulation device. The auxiliary device may also include a radio transceiver and an antenna. The stimulation device may include a housing, a coil, a power source and an integrated circuit for controlling the electrodes. The stimulation device may be coupled to a cuff via a lead and physically coupled to the auxiliary device.可植入系統被描述包含一刺激裝置及一輔助裝置。其中，刺激裝置可在體內定位並配置成通訊地耦接至多個電極，這些電極配置成刺激或阻斷身體組織。輔助裝置可在體內定位並包含一個或多個線圈，配置成在體內無線地耦接至刺激裝置及無線地耦接至一體外裝置。輔助裝置可包含一線圈驅動器及被一處理器與一記憶體控制的一電源，記憶體儲存對線圈驅動器的資料指令以及儲存接收自刺激裝置的資料。輔助裝置亦可包含無線電收發器及一天線。刺激裝置亦可包含一外殼、一線圈、一電源及控制電極的一積體電路，刺激裝置可透過一引線耦接至一壓脈帶以及實體上耦接至輔助裝置。
