HAND PROTHESIS Russian patent published in 2014 - IPC A61F2/56 

FIELD: medicine.

SUBSTANCE: invention refers to medicine. A prosthesis comprises a bucket of prosthesis, a thumb frame, second to fourth finger frames, a driving system for the mobility function of finger gripper and hand expansion, a radiocarpal flexion joint, a shoulder cuff, three potentiometers, three signal converters, a summation unit, two functional converter and four power amplifiers. The driving system represents four individual finger electrical microdrives rigidly fixed on the finger frames and coupled with their actuating mechanisms. The bucket is pivotally connected to the body, can be adducted and abducted, rigidly coupled with a rotor of the first potentiometer and pivotally elastically coupled with a spring-loaded lever connected with a stator of the first potentiometer. The spring-loaded lever is coupled with the second finger frame by a rocker provided with spherical pivots. The first potentiometer is connected with the first to third signal converters each of which is respectively series connected with the first to third power amplifiers, first to third drives and the actuating mechanisms of the second to fourth fingers. The second finger frame is rigidly connected with the rotor of the second potentiometer with its stator fixed on the body. The first finger frame is rigidly connected with the rotor of the third potentiometer with its stator fixed on the body of the device. The second and third potentiometers are coupled with the summation unit each of which is coupled with first and second functional converters series connected with the fourth power amplifier, the fourth drive and the actuating mechanism of the first finger. The fifth finger represents an elastic linkage. Each actuating mechanism of the first to fourth fingers is presented in the form of a worm-wheel drive a worm of which is rigidly connected with an output shaft of the drive. The worm wheel is rigidly fixed on the body, while the finger frame is pivotally connected with an axis of the worm wheel.

EFFECT: invention provides comfort of use by the self-maintained disabled person due to the reliable fixation of a manipulation object, reducing the range of compensatory motions and reducing thereby a time of motor operations when using the prosthesis.

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