Below-knee prosthesis provided with power ankle

Abstract

The invention relates to a below-knee prosthesis with a power ankle. The below-knee prosthesis comprises a lower leg prosthesis, an ankle joint and a prosthesis foot plate, and is characterized in that: the ankle joint comprises two brackets which are arranged on the back top surface of the prosthesis foot plate; each bracket is connected with one side of a swinging frame through a revolving shaft; a speed reducer is arranged in the swinging frame; the top of a shell of the speed reducer is fixedly connected with the top of the swinging frame; one side of the swinging frame is connected with a motor; the output end of the motor is used for driving each stage of gear of the speed reducer to rotate; an output gear of the speed reducer is an incomplete gear; an output shaft of the incomplete gear is rotationally connected in the speed reducer, and is concentric with revolving shafts on the two brackets; the bottom end of the incomplete gear passes through a speed reducer shell, and is fixedly connected with the top surface of the prosthesis bottom plate; and the top of the swinging frame is fixedly connected with the bottom end of the lower leg prosthesis. The below-knee prosthesis can be widely applied to the production processes of human body prostheses and intelligent robot lower limbs.

Description

technical field [0001] The invention relates to a below-knee prosthesis, in particular to a below-knee prosthesis with a dynamic ankle which is suitable for various types of below-knee amputees. Background technique [0002] With the increase of various natural disasters, diseases and traffic accidents, the number of disabled people is increasing year by year. According to statistics, the number of people with lower limb disabilities in my country is close to 9 million. As the number of people with disabilities increases, so does the need for prosthetics. In human below-knee prosthesis products, traditional passive below-knee prosthetic ankle joints use passive ankle joints such as single-axis ankles or universal ankle joints. The existing problem is that the walking speed cannot follow the amputee's walking speed naturally and freely. , the amputee is often forced to lean forward to make up for the lack of propulsion ability, which makes the amputee more likely to feel fat...

AI Technical Summary

Problems solved by technology

In human below-knee prosthesis products, traditional passive below-knee prosthetic ankle joints use passive ankle joints such as single-axis ankles or universal ankle joints. The existing problem is that the walking speed cannot follow the amputee's walking speed naturally and freely. , the amputee is often forced to lean forward to make up for the lack of propulsion ability, which makes the amputee more likely to feel fatigue; the existing active below-knee prosthesis driven by a motor can provide enough energy for the body to move forward, so as to realize the human body Natural gait, but the design of the ankle joint is relatively simple, which cannot meet the needs of users well

Hydraulic and pneumatic drives can provide huge torque instantaneously, but their control accuracy is low, noise is high, and the volume is large, so they are not suitable for application at the ankle joint of human prostheses; although motors have high control precision, they cannot provide huge torque instantaneously, and There is a locking problem

Most of the existing ankle joints on the market use inertial braking. Although the inertial braking device has a simple structure, when an amputee wears a prosthesis with an inertial braking device and wishes to stop moving, there are two aspects to its existence. The problem: on the one hand, the braking speed of the prosthesis is slow and the reliability is low; on the other hand, it will cause friction and reduce the service life of the prosthesis

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