Image of the Day: Second Hand

A 3-D printed prosthetic hand moves by reading the signals in forearm muscles.

Chia-Yi Hou
Jul 10, 2019
A non-amputee study participant wearing the electromyograph (EMG) measurement device (left) and the 3-D printed prosthetic hand (right)
FURUI ET AL., SCI. ROBOT. 4, EAAW6339 (2019)

A 3-D printed prosthetic hand can be wired to respond to signals from the muscles of the forearm, scientists report in Science Robotics on June 26. By interpreting the forearm muscle signals using electromyograph (EMG) measurements, the device can move its fingers. Hand amputee and non-amputee study participants wearing the prosthetic hand can move its digits and pick up small objects.

A. Furui et al., “A myoelectric prosthetic hand with muscle synergy–based motion determination and impedance model–based biomimetic control,” Science Robotics, doi:10.1126/scirobotics.aaw6339, 2019.

An amputee study participant uses the muscle signal–based prosthetic hand to pick up wooden blocks.
FURUI ET AL., SCI. ROBOT. 4, EAAW6339 (2019)

Chia-Yi Hou is an intern at The Scientist. Email her at