Fig. 1. 3D printed single channel myoelectric hand prosthesis.

(A) The single channel electromyography (EMG) sensor is installed in the socket where the maximal voltage change was check in the amputated forearm. (B, C) The prosthesis model with surface EMG sensor detects the location of the highest voltage change of myoelectrical signal in the stump, when the patient moving the remnant forearm muscle. The voltage change is displayed in the screen on the hand. This model can be used for the pre-application exam and patient’s follow-up. 3D, three-dimensional.