Electrical stimulation of the neuromuscular system holds promise for scientific and therapeutic biomedical applications. A key challenge is supplying power chronically, especially for high voltages/currents. Wireless systems offer a solution but currently lack the power and voltage for applications like muscle stimulation. This paper introduces a passive resonator-optimized power transfer design enabling ±20 V and >300 mW at 0.2 cm², a 500% improvement. Multichannel, biphasic, current-controlled operation is demonstrated in freely behaving animals, with chronic results showing functionality over 6 weeks in rats, enabling fine control of spinal and muscle stimulation.

Alex Burton, Zhong Wang, Dan Song, Sam Tran, Jessica Hanna, Dhrubo Ahmad, Jakob Bakal, David Clausen, Jerry Anderson, Roberto Peralta, Kirtana Sandepudi, Alex Benedetto, Ethan Yang, Diya Basrai, Lee E. Miller, Matthew C. Tresch, Philipp Gutruf