FOREARM PROSTHESIS Russian patent published in 2017 - IPC A61F2/54 A61F2/56 A61F2/58 A61F2/68 A61F2/72 

FIELD: medicine.

SUBSTANCE: forearm prosthesis comprises an artificial electro-hand with bioelectric drive control, a bearing sleeve, connected to the support housing and provided with fastening elements, a receiving sleeve placed in the bearing sleeve with a possibility of rotation, hand rotation drive, hand bending drive, detachable shoulder strap with a possibility of shoulder arm joint coverage. The bearing sleeve is made constructively non-detachable. The hand rotation drive and the hand bending drive are made with an electromechanical positional control. The support body has a pivotally mounted hand rotation shaft fixedly connected to the hand bending hinge with one end and to a rotary spring clutch with the other end, the stator has a fixedly mounted hand rotation control sensor with rotor kinematically, for example, by gearing, connected to the spring clutch rotor which is connected to the sleeve. The rotation drive fixedly mounted on the support body and kinematically, for example by gearing, connected to the hand rotation shaft. The fixed part of the hand bending hinge connected to the hand rotation shaft has the fixed hand bending drive with its output shaft connected to the movable part of the hand bending hinge, and the fixed hand bending angle sensor with its rotor connected to the movable part of the hand bending hinge. The shouder strap has the fixed hand bending sensor with its rotor fixedly connected to the first end of the elastic rod, placed in a flexible envelope, with one end fixed on the shoulder strap, and with the second end - on the bearing sleeve. The other end of the elastic rod is left free. In the electronic control unit three independent actuator control systems are formed. In the hand rotation drive control channel, the hand rotation sensor and a reference voltage source are connected to the first adder input, the output of which is connected to the first and the second pulse converters connected to the first power amplifier with output connected to the hand rotation electric drive. In the hand bending drive control channel, the hand bending control sensor and the feedback sensor in the form of hand bending angle sensor are connected to the second adder input, the output of which is connected to the third and the fourth pulse converters connected to the second power amplifier with output connected to the hand rotation electric drive. In the hand control system, sensing elements in the form of two pairs of surface electrodes are mounted on the bearing sleeve and electrically connected to the electronic control unit. The electronic control unit and the power supply are mounted on the shoulder strap.

EFFECT: increased convenience of the disabled by reducing his/her energy input for device management, increased convenience in carrying out of targeted actions of self-care by reducing the amount of compensatory movements and simultaneous management of three degrees of hand prosthesis mobility in the natural mode.

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