Active and passive hybrid type artificial limb knee joint

Abstract

The invention discloses an active and passive hybrid type artificial limb knee joint. The knee joint comprises a supporting and fixing assembly, a motor, an artificial limb shank fixing part, a synchronous pulley assembly, a lead screw assembly, a damping cylinder, six self-holding electromagnets, a connecting rod assembly and an on-knee socket fixing part. Switching of active and passive modes isperformed by telescopic rod structures controlled by the self-holding electromagnet, by use of a passive telescopic rod, a multi-rod structure in the passive mode can simulate human gaits, by use ofthe active telescopic rod structure, rotation of a thigh fixing part can have larger force arm during active drive, the passive structure adopts the multi-rod structure of the damping cylinder and canbetter simulate human gaits, and the active drive structure adopts the motor to drive the synchronous pulleys so as to drive lead screw drive. The knee joint is precise in drive and convenient to maintain.

Description

technical field [0001] The invention belongs to the technical field of rehabilitation aids, in particular to an active-passive hybrid prosthetic knee joint. Background technique [0002] As a rehabilitation aid that compensates for human walking, lower limb prostheses have been widely used in patients with lower limb amputations. As the core key component of lower limb prosthetics, the research and development of the knee joint is a technical difficulty in the research of lower limb prostheses. Existing prosthetic knee joints can be divided into active-driven prosthetic knee joints, passive prosthetic knee joints, and active-passive hybrid prosthetic knee joints. Among them, the passive knee joint uses a damping mechanical structure to simulate the flexion and extension movement of the human knee joint, which can better meet the walking needs of above-knee amputee patients when walking on flat roads, but it cannot be used in complex motion states such as climbing stairs. I...

AI Technical Summary

Problems solved by technology

[0003] Literature research shows that the current active-passive hybrid prosthetic knee joints generally have the following deficiencies: First, when the active-passive mode is switched, the clutch structure is often used, which leads to mutual coupling and mutual influence between the active structure and the passive structure, and cannot fully play the active role. Advantages when the structure and the passive structure act separately; secondly, in the passive mode, single-axis rotation is mostly used, and the instantaneous center of the knee joint is fixed during flexion and extension, which cannot form a symmetrical gait with the healthy limb side well, causing the patient to wear a prosthesis. , walking unnaturally, gait asymmetry, which in turn increases the energy consumption of exercise

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