Overview
Neural dust is a millimeter-scale wireless sensor technology developed under DARPA's Electrical Prescriptions (ElectRx) program for detecting electrical activity of nerves and muscles deep within the body. The technology uses ultrasound for power coupling and communication, enabling sensors small enough to be implanted in individual nerves.
Key Specifications
- Size: Prototype motes measure 0.8 mm × 3 mm × 1 mm; custom manufacturing could achieve 1 cubic millimeter or smaller (potentially ~100 microns per side)
- Components: Three main parts — pair of electrodes for nerve signal measurement, custom transistor for signal amplification, and piezoelectric crystal that converts ultrasound mechanical power into electrical power while communicating recorded activity
- Power source: External transceiver board emits ultrasonic pulses; the device is completely passive with no batteries requiring replacement
- Communication: Ultrasound-based bidirectional communication through reflected pulse encoding of electrophysiological voltage signals
- Transceiver distance tested: ~9 mm from implant to external board during testing
Development Context
Developed by a team led by UC Berkeley's Department of Electrical Engineering and Computer Sciences, first published in the journal Neuron (August 2026). The technology represents a radical departure from traditional radio wave-based wireless communication with implanted devices. Ultrasound penetrates soft tissue more effectively than radio waves because sound passes freely through saltwater-based tissues while radio waves do not — similar to why sonar images objects underwater while radar detects objects in air.
Applications
Therapeutic modulation of the peripheral nervous system (PNS) for mitigating and treating disease and health conditions. The small size enables multiple sensors placed near each other for more precise recordings from many discrete sites within a nerve bundle or group of nerves.
Future Development
The research team continues work on further miniaturization, ensuring biocompatibility, increasing transceiver board portability, and achieving clarity in signal processing when multiple sensors are placed near each other. The proof of concept was developed under the first phase of the ElectRx program.