Carbon Nanotube Yarn Muscle: Prosthetic Finger Actuator

Nanotechnology is reaching prosthetics not only through neural interfaces and touch sensors but through the actuator itself. This simulator models a twisted-and-coiled carbon-nanotube yarn artificial muscle — a real electrothermal nanomaterial actuator studied as a lightweight, gearless drive for prosthetic fingers. Apply a drive voltage and watch Joule heating raise the yarn's temperature, which untwists the coil and contracts it, pulling a tendon that curls a three-phalanx finger. A grip-load slider reproduces the actuator's force–stroke trade-off, and a cooling-airflow slider controls how quickly it relaxes, while live readouts track temperature, contraction strain, tendon force and finger closure.