Neuroprostheses, for rehabilitation of basic neurological functions in persons with spinal cord injury, should be improved by the use of feedback signals. Internationalneuroprosthesis research centres propose to design efficient sensing systemising natural sensory signals. Compared to existing recording nerve electrodes, the SENS smart electrode will improve signal-to-noise ratio and selectivity.lndeed, twill take advantage of the spiral cuff nerve electrode and include a multicontactthin conductive film. Recorded signals will be amplified, digitised and multiplexed using an encapsulated ASIC directly installed on the nerveelectrode. An implanted monitoring unit will process the multiplexed signals coming from 2 to 4 smart electrodes. Through a trancutaneous link, it will communicate with, and be supplied by an external interface located outside the skin. Thefully-validated SENS system would then be used in closed- loop neuroprostheses.