Ankle joint prosthesis controlled by a multi-start screw drive with a stepper motor

Abstract

This utility model relates to the field of medicine, specifically lower limb prosthetics, and is intended to replace a missing portion of a lower limb while providing controlled movement of the foot relative to the lower leg. Known ankle prosthetic designs may incorporate hydraulic, electropneumatic, and geared drive systems. However, such designs can be complex and make it difficult to ensure smooth and precise movement of the foot relative to the lower leg. The objective of the claimed utility model is to create an ankle prosthesis that provides controlled movement of the foot relative to the lower leg using a multi-threaded screw drive with a stepper motor. The technical result of the claimed utility model is to ensure smooth and precise movement of the foot relative to the shin by converting the rotational motion of the stepper motor into the translational motion of the nut of the multi-start screw drive, followed by transmission of the motion through the bracket. The ankle prosthesis comprises a foot, a lower leg, and a multi-start screw drive comprising a stepper motor, a multi-start screw, a nut mounted on the stepper motor for translational movement, and a bracket connected to the nut. The stepper motor is kinematically connected to the multi-start screw. When the multi-start screw is rotated by a stepper motor, the nut moves along the longitudinal axis of the screw, and its translational movement is transmitted through the bracket to the elements of the prosthesis, ensuring controlled movement of the foot relative to the lower leg.