Abstract: A prosthesis for a person with an amputation above the elbow is provided in which elbow motion is provided by an electrical motor contained within the prothesis. Operation of the motor is controlled by electric impulses from selected opposing muscle pairs on the amputee. The prosthesis is constructed with both internal and external modules which are readily replaceable. An electrically operated lock mechanism is provided for locking the elbow motion of the prosthesis. The locking mechanism is controlled by logic circuitry which in turn operates in response to electric impulses from the pair of muscles on the amputee. Novel means are also included which provide passive wrist movement and humeral rotation of the prosthesis. A removable battery module comprising rechargeable storage cells provides power for the motor and the electrically operated lock mechanism.

Abstract: An improved iontophoresis device for topical administration of ionic drugs or chemicals through epidermal tissue for anesthetizing or sterilizing local tissue or for applying various medicaments without mechanical penetration. An ionic form of drug is conducted through the epidermal tissue by means of direct current generated from a battery powered current source. Pulse-width modulated DC current is regulated by feedback circuitry which varies the pulse duration and adjusts and stabilizes the average current at a desired level. A high voltage capability together with feedback control enables maintenance of a constant current through the highly resistive epidermal tissue. To prevent excessive voltage buildup and the accompanying dangers of shock and burns, a comparator circuit monitors current flow and voltage across the electrodes and automatically triggers an SCR shutdown circuit when impedance readings are outside predetermined limits.