Fig. 8: A hypothetical fully implantable upper extremity movement restoration system for people with hemiparesis from chronic stroke.
From: Neuromotor prosthetic to treat stroke-related paresis: N-of-1 trial

Sensors implanted within or adjacent to perilesional motor cortices relay signals wirelessly to microprocessors that decode motor intent that in turn triggers a functional electrical stimulation system implanted within the paretic limb to restore voluntary motor function.