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Myoelectric Prosthesis

Operating principle

Myoelectric prostheses operates using  the controlled muscle contractions of the patient.

Electrodes placed in contact with the skin pick up muscle signals that are sent to a motor placed in the hand. The engine goes into action with the energy supplied by a battery, thereby triggering the opening and closing of the hand.

For the optimum operation of the prosthesis, the choice of electrode placement is critical.

We use the MyoBoy tester to visualize on a computer screen a representation of the muscle contractions, but also to simulate the different types of myoelectric hands.

We can thus validate the point where the muscle is most effective to activate the operation of the hand: the motor point.

In some cases, the muscle impulse is too weak or nonexistent, the trigger level to operate a prosthesis will not be reached.

The tester is also used in rehabilitation centers for training of patients in order to gain better control of the hand.

The prosthetic forearm  socket is based on the same principles as for fixing a conventional prosthesis: a sub-epicondylar clip, it is the same for prosthetic arms that are held by a strap-harness.

 

Upper limbs - Myoelectric Prosthesis - Myoelectric Prosthesis -