A single-degree-of-freedom active knee prosthesis based on a closed hydraulic drive circuit

Abstract

The invention discloses a single-degree-of-freedom active knee joint prosthesis based on a closed hydraulic drive circuit, and belongs to the technical field of prostheses and orthotics. The prosthesis includes a knee joint connection hinge, a knee joint bracket, a hydraulic manifold block and a carbon fiber sole, wherein the hydraulic drive circuit is integrally arranged inside the hydraulic manifold block. The hydraulic drive circuit specifically comprises a DC frameless torque motor, a single output rod hydraulic cylinder, a micro gear pump, a high pressure energy accumulator, a low pressure energy accumulator, a first normally closed switching valve, a second normally closed switching valve, a first normally open switching valve, a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve. The active-passive combined operation mode of the prosthesis in the invention can effectively reduce the energy consumption during the whole walking process; the hydraulic drive circuit has high integration degree, so that the portability during the use of the prosthesis is improved; and due to the energy accumulation function of the energy accumulators, the power consumption for driving the prosthesis is greatly reduced and the endurance is improved.

Description

Technical field [0001] The invention belongs to the technical field of prostheses and orthotics, and specifically relates to a single degree of freedom active knee joint prosthesis based on a closed hydraulic drive circuit. Background technique [0002] In order to help people with physical disabilities recover their basic motor functions and their ability to take care of themselves in life, the development of intelligent prosthetic systems has become an important goal in the current domestic and foreign prosthetic industry research. As an important part of the lower limb joints of the human body, the knee joint has been developed for many years and has been able to solve some problems of the knee joint prosthesis, but there are still certain defects. [0003] Compared with the traditional passive knee joint prosthesis, the active knee joint prosthesis can significantly improve the coordination of human movement gait. For amputees, the active knee prosthesis can provide active dri...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a single-degree-of-freedom active knee prosthesis based on a closed hydraulic drive circuit. Specifically, it utilizes a large power density ratio, fast response speed, and large output torque, which can provide The hydraulic drive circuit with variable damping solves the problem that existing active knee joint prostheses cannot perform damping control and energy recovery, and improves the performance of prosthetic products

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