Design And Research On Neuroprosthesis System For Lower Limbs Based On FES

According to statistics, the number of paralysises because of spinal cord injury (SCI) is increasing, and the patients with SCI have become'a special social group needs attention and care immediately'. However, due to the weak regeneration of the spinal cord, there is no effective measure to repair the injury spinal cord currently, excepting to depend on functional rehabilitation theraphy. Neuroprosthesis is a kind of electronic device which helps the injury nerve to restore its function. It always replaces the order of the nerve control from the brain with the functional electrical stimulation (FES), driving the prosthetic and orthopaedic for action, in order to renew the functional of the muscle. In the field of the paralysis rehabilitation, functional electrical stimulation (FES) is now considered to be the most effective way.In order to meet the demands of the FES research and the paralyzed patients, the paper designs a neuroprosthesis system for lower limbs based on FES. The hardware of the system includes eight modules which are the control, D/A converter, the current source, wave-overturned, function keys, display,stimulating electrode and power. C-language software is used to coordinate the function of the various modules. This system has four independent channels and its control method is manual. The current of the system can be adjustmented depending on the condition of the paralyzed patients.In this paper, the human kinematics parameters are used to evaluate the system. The knee angle is measured when the thigh is stimulated, which indicates that the standing can be achieved by stimulating; The basic parameters of kinematics (Step index, Stepping time) in different current are detected stimulating the leg, and the angle of the knee in the best stepping threshold and the normal walking are also detected and compared. The results indicate the stimulator is excellent.In short, this study is a good theoretical and experimental basis for the future study of the lower limb prosthesis motor nerve reconstruction.