Application of the Generic Control System in the Above-Elbow Prosthesis

RINCHEN DAKPA, CP** Toronto, Ontario


A 12-year-old girl with elbow disarticulation was first fitted in 1982 with an Otto Bock two-state two-site myocontrol system for the hand, using the biceps and triceps muscles as control sites. Because the patient and parents disliked the conventional outside locking hinge elbow, a Variety Village electric elbow was fitted upside down to reduce the humeral length discrepancy. It was activated by a pull switch triggered by shoulder depression. The parents continued to request a more cosmetically appealing prosthesis, eliminating the control cable and harness for the activation of the electric elbow.

In December 1985, we tried the generic control system developed by Stephen Dillon. The system can then be applied as a one-muscle three-state control system or a two-muscle proportional control system controlling two powered devices. The generic control system incorporates Otto Bock double channel (13E60) electrodes. The existing electrodes were replaced by double channel electrodes and the generic control unit was mounted in the forearm. Thus, we replaced the harness and the switch for the elbow control with the generic proportional control system. The patient and parents are extremely pleased with the system.

**Hugh MacMillan Medical Centre, 350 Rumsey Road, Toronto, Ontario, Canada M4G 1R8