ACTIVE IMPLANTED MEDICAL DEVICE (AIMD) WITH IN SITU OPTIMIZATION OF POWER CONSUMPTION

The present invention concerns an active implantable medical device (AIMD), for electrical stimulation of a tissue, the AIMD comprising: * a light source (53L), lodged in an encapsulation unit, for delivering optical energy pulses of optical power (Popt), * a stimulation optical fibre (41s) for transferring optical energy from the light source of the encapsulation unit to the tissue coupling unit (60), * the tissue coupling unit (60) is configured for being coupled to a tissue to be electrically stimulated by electrodes (65) belonging to an electrical citcuit (62); wherein, * The PV-unit comprises Us units arranged in series, each unit comprising Pp photovoltaic cells (PV-cells) arranged in parallel, wherein Us and Pp, ϵ N, and Us x Pp = N = constant, * the electrical circuit (62) comprises switches configured for varying the values of Us and wherein, alternatively or concomitantly, the light source (53L) is an addressable optical emitters array.