Before revision:  We present a complete wireless neural stimulation system consisting of a 2.2 mm3 wireless, batteryless, leadless implantable stimulator implant (the "mote"), an ultrasonic wireless link for power and bi-directional communication, and a hand-held external transceiver.
After revision: Neural stimulation is a powerful technique for modulating physiological functions and for writing information into the nervous system as part of brain-machine interfaces. Current clinically approved neural stimulators require batteries and are many cubic centimeters in size- typically much larger than their intended targets. We present a complete wireless neural stimulation system consisting of a 2.2 mm3 wireless, batteryless, leadless implantable stimulator implant (the "mote"), an ultrasonic wireless link for power and bi-directional communication, and a hand-held external transceiver.