||Sat 2013-Aug-10 18:34:00
||Tue 2015-Aug-25 21:25:50
||A major hurdle in brain-machine interfaces (BMI) is the lack of an implantable neural
interface system that remains viable for a substantial fraction of a primate lifetime.
Recently, sub-mm implantable, wireless electromagnetic (EM) neural interfaces have been
demonstrated in an effort to extend system longevity. However, EM systems do not scale down
in size well due to the severe inefficiency of coupling radio waves at mm and sub-mm scales.
We propose an alternative wireless power and data telemetry scheme using distributed,
ultrasonic backscattering systems to record high frequency (~kHz) neural activity. Such
systems will require two fundamental technology innovations: 1) thousands of 10 – 100 um
scale, free-floating, independent sensor nodes, or neural dust, that detect and report local
extracellular electrophysiological data via ultrasonic backscattering, and 2) a sub-cranial
ultrasonic interrogator that establishes power and communication links with the neural dust.
To test the feasibility of this approach, we performed the first in-vivo experiments in the
rat model, where we were able to recover mV-level action potential signals from the
peripheral nerves. Further miniaturization of implantable interface based on ultrasound
would pave the way for both truly chronic BMI and massive scaling in the number of neural
recordings from the nervous system.
|IAB Research Area
||Michel M. Maharbiz