Design of Above Elbow Prosthesis articulated with Electro-myogram signal and electrical switch

Abstract

A motion control strategy for 3 Degree of freedom prosthetic arm actuated with EMG signal from muscle activity to move end gripper and wrist; and electrical switch to move elbow joint has been proposed as a mimic to the biological hand. The design and control is carried out in accordance with precise electronic control, sufficient drive torque, requirements of variable grip force and ease of attachment with limbs. The features like grasping objects of different weights with variable grip force, wrist rotation and elbow movements are available with auto-locking features. Two Electro-Myogram (EMG) electrodes are used to tap the bio-electric potential from two antagonistic residue stump muscles. A novel decision making strategy has been implemented to realize the real-time EMG control of the end gripper and wrist. The arm is able to accomplish functions useful for both robotic & prosthetic industry.