一种基于体表肌电信号通信原理的功能性电刺激系统设计

A Functional Electrical Stimulating System for Upper Limb Functional Rebuilding Based on Surface Electromyography and Communication Principle

基于传感与通信原理和肌电阈值不应期算法,文中设计了一种基于对侧体表肌电信号控制的上肢功能电刺激原型系统。该系统穿戴方便,具有基本的FES功能、对侧控制FES功能以及体表电极刺激和电针刺激两种输出接口。通过对探测端自主肌电脉冲序列利用阈值不应期算法进行解码并实时生成对应的FES刺激脉冲序列,使受刺激肢体跟随探测端肢体力量运动。文中对健康志愿者上肢腕伸动作进行了力量跟踪实验,测试结果显示,探测端腕关节力矩曲线与刺激端腕关节力矩曲线的相关系数为r=0.9254,均方根误差RMSE=0.1843。实验结果显示,该系统能够使志愿者刺激侧腕伸肌较好的跟踪探测端肌肉发力情况,完成腕伸运动功能重建。该原型系统对于偏瘫上肢康复训练具有重要的临床意义。

In this paper, a contralateral surface electromyography controlled functional electrical stimulation system was designed for upper limb motor functional rebuilding. The proposed system utilized the decoding method based on threshold and refractory period and the principle of sensor and communication. Because the output stimulus pattern was transformed from the recorded volitional sEMG activity, the system could make the force generated by stimulated limb trace the recorded limb’s motion. The prototype also had traditional FES function with surface electrode stimulation and electro-acupuncture stimulation output interfaces. The proposed system was tested in healthy subjects and the measured results illustrated that the extension torques generated by stimulated and recorded wrist joints were similarly same (correlation coefficient was 0.925 4 and RMSE was 0.184 3). The experimental results showed that the prototype could enable the volunteers to complete the reconstruction of the wrist extension function, indicating that the prototype system had important clinical significance for the rehabilitation of upper limbs.