DextrEMS: Achieving Dexterity in Electrical Muscle Stimulation by Combining it with Brakes
summary
Combines electrical muscle stimulation with per-joint mechanical ratchet brakes to actuate eight joints (MCP and PIP for four fingers) on an untethered 68 g wearable using forearm electrodes and an external stimulator plus tiny DC motors to jam pawls. Brakes lock joints so EMS can move selected fingers without spillover, then hold poses without oscillation; evaluation reports doubles EMS independence and similar precision with far fewer unwanted oscillations. Demonstrations include fingerspelling, piano and guitar tutoring, and a Whack‑a‑mole VR interaction.
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