LEG PROSTHESIS Russian patent published in 2019 - IPC A61F2/66 A61F2/62 

FIELD: medicine.

SUBSTANCE: invention relates to medicine. Leg prosthesis comprises a receiving sleeve, a shin post, a foot in which a flat curved spring forms a front part of the foot, and the back part of the foot adds by an elastic plate rigidly connected to the support surface. Active ankle actuator comprises a hinge case for back folding of the foot, in which a foot bracket is pivotally mounted by means of a dorsal flexure axis rigidly connected to it, and also rigidly connected to the front part of the foot. Body has a self-locking double-acting overtaking clutch with a split disc, the cage of which is rigidly fixed in the housing. On one side, the rear bending axis is rigidly connected to the clutch cam installed between its half-discs, and the clutch lead, enclosing the half-discs, is rigidly connected to the output shaft of the motor-reduction gear of the rear end drive electric motor, the flange of which is connected to the housing. Half-discs are spring-loaded and pressed to holder. Axis of back flexure on other side is rigidly connected with rotor of angular flexion angle sensor, and its stator is connected to housing. Proposed device comprises electronic unit for control channel of back folding wherein feedback control sensor and feedback sensor in form of rear flexion angle sensor is connected to input of adder. First and second impulse converters are connected at the output of the adder. Pulse transducers are connected to power amplifier, output of which is connected to motor gearbox of electric drive of rear flexion connected with actuator of rear folding of foot. Electronic control unit and the power supply are fixed to the receiver sleeve. Dumb-bend control sensor is made in the form of a bioelectric control sensor containing in-series electrodes, a preamplifier, a detector and a filter. Two limit switches are introduced into the control channel so that the drive can be protected against overload at the moment when the actuator arrives at the stop in the extreme positions of the mechanism. Bioelectric control sensor is placed on the receiving sleeve.

EFFECT: invention provides physiological walking on prosthesis in statics and dynamics due to possibility in natural mode to perform back folding of foot, completely preserving anthropomorphy of motion during foot transfer above surface of support.

1 cl, 2 dwg