Design and control of prosthetic hand using myoelectric signal

Abstract

The surface electromyogram (sEMG) signal is widely used to control externally powered prosthesis, robot, and human-computer interfaces (HCI) as it contains important neuro muscular information. A prosthetic device is a biomimetic device that replaces a missing body part of an amputee which may be lost due to trauma, disease or congenital conditions. A myoelectric prosthesis is controlled by sEMG signals. The sEMG signals are electrical manifestation of neuro muscular activities which is recorded non-invasively using bio-potential electrodes. In this work, three surface electrodes are placed on the forearm over the relevant muscles. The acquired sEMG signals are filtered, amplified and converted into the digital signal when the forearm muscles get contracted and relaxed. The output of the processed is further transmitted to the controller to which the five DC motor of the prosthetic hand are connected. These DC motors are intended to control each of the finger of the prosthetic hand. Depending upon the controller output, appropriate DC motor is actuated to perform the hand movement.