Abstract: The implantable medical device includes high-voltage components (such as defibrillation shock generation components) operative to generate high-voltage pulses for delivery to tissues of the patient while using the case or housing of the device as a stimulation electrode. The device also includes low-voltage Medical Implant Communication Service (MICS) or Medical Device Radiocommunications Service (MedRadio) components operative to generate low-power signals for communicating with an external device via radio frequencies while using the case as part of an antenna. A conductive noise shield is mounted within the case of the device and interposed between the high-voltage components and the case, with the shield configured to attenuate electrical interference between the high-voltage components and the case to facilitate radio-frequency communication between the low-voltage MICS/MedRadio components and the external device, which use the case as part of the antenna.

Abstract: A pulse generating implantable medical device comprises a power source , a control unit, a plurality of switching units, a timing unit, a pulse generating unit adapted to generate one or more stimulation pulses to be applied to human or animal tissue via one or more stimulation electrodes, and a coupling capacitor in series with each stimulation electrode. A stimulation pulse is adapted to be applied during a stimulation pulse timing cycle that includes a stimulation phase and a recharge phase, and that the timing of a stimulation pulse timing cycle is controlled by the control unit via the timing unit and the switching units. The implantable medical device further comprises an energy storage unit and that, during the recharge phase, one or more of the switching units is adapted to establish electrical connection between the one or many stimulation electrodes and the energy storage unit in order to collect and store energy from applied stimulation pulses.