Brain implant restores feeding and touch for tetraplegic patient

Neurologists in New York implanted a brain‑computer interface using a “double neural bypass” that connects five microelectrodes in the brain to the forearm muscles of a tetraplegic patient. Machine‑learning algorithms interpret the patient’s movement intentions with about 85% accuracy and translate them into electrical stimulation that lets him lift a fork, bring food to his mouth and drink. Sensors in a 3‑D‑printed splint also stimulate the sensory cortex, creating a sense of touch; the patient can pick up egg shells without breaking them in roughly 90% of attempts. The 15‑hour surgery marks a first in combining motor and sensory restoration, and researcher Chad Bouton said, “this method is a new way to treat severe paralysis—we are not just bypassing the lesion, we are actually rewiring the nervous system.” The team plans to expand trials to other individuals with spinal cord injuries.