Double-piston positive-negative pressure pneumatic pump fixed axis swing prosthetic knee joint

Abstract

The invention discloses a double-piston positive-negative pressure pneumatic pump fixed axis swing prosthetic knee joint which is applicable to an auxiliary instrument for users without single knee joints. The assembly weight of a whole prosthesis can be effectively relieved, the joint flexibly swings, assistance in the swing process of the prosthesis and buffer in change of a swing direction are realized by the aid of positive pressure and negative pressure of a double-piston positive-negative pressure pneumatic pump, and running reliability is enhanced by the aid of double pistons. The joint is simple and reliable in design and provided with easily adjusted adjustment holes, and the users without single knee joints and with different weights can be adjusted in a targeted manner.

Description

technical field [0001] Auxiliary devices for persons with one missing knee joint. Background technique [0002] The prosthetic knee joint controlled or driven by electric energy is not practical because of its high cost, complex structure, unstable performance and lack of safety. The present invention only utilizes the swinging potential energy of the residual limb of the user to easily realize the function of safe walking and obtain the functions of assisting and buffering. Similar prosthetic knee joint products currently on the market are designed with a planar linkage mechanism. The "cumulative error" of the planar linkage mechanism requires improved accuracy and increased damping. When the planar linkage mechanism is stretched, the distance between the connecting parts and the connecting parts increases, and when it is compressed, the distance between the connecting parts and the connecting parts becomes shorter. Specifically, the assembled The prosthetic limb becomes ...

AI Technical Summary

Problems solved by technology

And because the air pressure mechanism of the prosthetic knee joint on the market is single-compression, the swing of the knee joint causes the stroke of the air pressure system to be too long, and a large external pressure is required at the end of the compression. In order to obtain this pressure, the weight of the sole of the foot must be increased. It is also the reason why the total weight of prosthetics cannot be reduced.

The above-mentioned connecting rod prosthetic knee joint products cause extra energy consumption of the user, affect the walking ability, and cause obvious unsightly phenomena such as "pause" and "foot stepping"

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