Slim bands fastened around a patient's limbs that deliver electrical stimulation to weakened muscles, allowing someone with neurological damage to move and retrain the body during rehabilitation.
Motor assist bands are a piece of 24th-century rehabilitation equipment. Strapped around the arms and legs, they supply carefully tuned impulses to muscles that the patient's own nervous system cannot yet drive properly, so that walking and grasping can be practised while natural control returns.
They are seen in the Next Generation episode Transfigurations. Doctor Crusher fits them to the amnesiac survivor the crew call John Doe after he is pulled from a crashed escape pod on a planet in the Zeta Gelis cluster with terrible injuries. With the bands he progresses from lying helpless on a biobed to walking the corridors.
As his mysterious cellular mutation advances he soon no longer needs them, a first sign that his body is changing into something beyond ordinary humanoid life.