Name：Myoelectric AE prostheses with three degrees freedom, for elbow disarticulation.
Function: actions of hand, wrist, elbow are all controlled by myoelectricity.
1.Actions of hand,a R-L 360 degrees rotation and extension or flexion of elbow can be controlled by myoelectricity.
2.Passive changeover switch is added in case of myoelectricity switch failures.
3.Upper arm can rotate passively and self-lock at any position.
4.Anti-electromagnetic interference（mobile phone, for example）
5.Suitable for upper arm elbow, disarticulation, Middle, and long stumps of upper arm.