Innovative control method for myoelectric control arm prosthesis

Abstract

The invention relates to a control method for a myoelectric control arm prosthesis. Since currently, the myoelectric signal intensity of part of amputees can meet the requirement of using proportionalcontrol myoelectric arms, but most amputees only use switch control myoelectric arms, the innovative control method can overcome the defects in the prior art; according to the method, the myoelectriccontrol arm prosthesis has two or more control states with different finger speeds and gripping forces, the control states of the arm prosthesis are circularly switched by using a third myoelectric signal code except finger extension and flexion, a feedback signal is adopted for indicating the current control state of the arm prosthesis, and it is proved through practice that the control method is very convenient to use and practical.

Description

technical field [0001] The invention relates to the technical field of artificial limbs, in particular to a myoelectric prosthetic hand. . Background technique [0002] Due to various factors such as work-related injuries, traffic accidents, wars, natural disasters and congenital defects, a large number of people with upper limb loss will inevitably be produced, and a large part of them need to install myoelectric control prosthetic hands. After long-term development of prosthetic technology, myoelectric prosthetic hand technology with opening and closing functions has been very mature and mass-produced. The most popular and commonly used at home and abroad is to control the grip force without sensor feedback. When the myoelectric signal of the extensor or flexor reaches a certain level, it is judged as a control signal, which controls the opening and closing of the fingers respectively. The speed is fixed, and the grip force is also fixed after gripping. This kind of swit...

AI Technical Summary

Problems solved by technology

Another control method is to use the strength of myoelectric signals to control the speed and grip of fingers, which is called proportional control myoelectric hand. This kind of myoelectric hand requires amputees to have strong myoelectric signals, and a large part of upper limb amputee Due to muscle damage, atrophy, too thick subcutaneous fat, and other reasons, the myoelectric signal cannot meet the requirements, and it is often impossible to use the ratio control myoelectric hand

Many patients can only send out weak myoelectric signals, which can only produce simple opening and closing signals, and cannot freely make the residual limb muscle contraction produce linear changes. The myoelectric signal is used to adjust the ratio to control the speed and grip strength of the myoelectric hand

Images