Prosthetic hand for controlled actuation by electromyogram signals

摘要

1,102,803. Artificial hands. NATIONAL RESEARCH DEVELOPMENT CORPORATION. 30 March, 1966 [30 March, 1965; 31 March, 1965; 9 April, 1965; 28 Oct., 1965], Nos. 13371/65, 13661/65 15204/65 and 45639/ 65. Heading A5R. [Also in Divisions G3 and H2] An artificial hand comprises an electric motor driving lead-screw 46 for moving nut 45 whereby fingers 34, 35, open away from or close towards thumb 60. A lever 62 is pivoted between cheeks formed on the nut and is attached to beam 42 coupled to rod 41 through lever 61. Linear movement of the rod 41 causes the fingers 34, 35 to pivot about pins 38, 39. When, in closing, an object is gripped 'between thumb and fingers, 34, 35, the third and fourth fingers 36, 37 being fixed, beam 42 is bent whereby strain gauges 53 provide a signal for controlling the motor. The motor is also controlled by electromyogram signals derived from two pairs of electrodes which are attached to the forearm in the neighbourhood of the flexor and extensor muscles respectively (see Division H2). The fingers and thumb may be replaced by the halves of a split hook hinged to close together.