Imagine tiny wireless sensors the size of a grain of sand that can be implanted in the human body to monitor nerves, muscles and organs in real time. … engineers from the University of California, Berkeley recently created these batteryless sensors, opening the door to ‘electroceuticals’ — an emerging field in which these devices are used to treat disorders like epilepsy, stimulate the immune system or reduce inflammation by stimulating nerves and muscles.
Source: Infinity in a grain of sand: neural dust sensors monitor the body from inside