基于步态事件和sEMG的功能性电刺激起始点研究  

Study of functional electrical stimulationonset based on gait events and sEMG

作　　者：邓昌仁 陈恩伟[1] 张佳峰 王勇[1,2] DENG Changren;CHEN Enwei;ZHANG Jiafeng;WANG Yong(School of Mechanical Engineering,Hefei University of Technology,Hefei 230009,China;Intelligent Interconnected Systems Laboratory of Anhui Province,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学机械工程学院,安徽合肥230009 [2]合肥工业大学智能互联系统安徽省实验室,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2024年第5期590-595,共6页Journal of Hefei University of Technology：Natural Science

基　　金：科技部中小企业创新基金资助项目(11C26213402042);中央高校基本科研业务费专项资金资助项目(JZ2016YYP0066);合肥市自然科学基金资助项目(2021031)。

摘　　要：足下垂患者步行过程中进行功能性电刺激可以帮助其恢复正常行走能力,而准确确定功能性电刺激的开启时间至关重要。文章针对该问题,利用步行过程中下肢的角速度和表面肌电信号(surface electromyography,sEMG),提出一种以步态事件与肌肉动作点之间延时关系为控制策略的足下垂步行过程中功能性电刺激准确开启的方法。根据步态信息和sEMG电信号特征对大腿处的角速度数据进行步态事件划分,试验结果表明步态事件划分得具有良好一致性;利用模糊熵算法对去噪后的sEMG信号进行肌肉运动起始点T muscle的判定,确定T muscle与脚尖离地(toe off,TO)之间的延时时间关系;结合所划分的步态事件特征点,确定电刺激起始点T on。该文为足下垂治疗中功能性电刺激开启时间点的确定提供了一种新的辨识方法。Functional electrical stimulation during foot drop walking can help patients restore their normal walking ability.Therefore,it is very important to accurately determine the on-time of functional electrical stimulation.To address this problem,this paper used the angular velocity of the lower limbs and surface electromyography(sEMG)signals during walking to explore a method of controlling the delay relationship between gait events and muscle action points as a control strategy for the accurate determination of functional electrical stimulation onset during foot drop walking.According to the characteristics of gait information and sEMG signals,this paper designed a wireless acquisition device,and then divided the angular velocity data of the thighs into gait events.The experimental results show that the gait event division has good consistency.The fuzzy entropy algorithm was used to determine the muscle movement onset T muscle from the denoised sEMG signals,to determine the delay relationship between T muscle and toe off(TO),and to determine the electrical stimulation onset T on by combining the delineated gait event characteristic points.This study provides a new identification method for the accurate onset of functional electrical stimulation in foot drop treatment.

关 键 词：步态分析 表面肌电信号(sEMG) 模糊熵 功能性电刺激起始点 足下垂 

分 类 号：TN06[电子电信—物理电子学] R318.6[医药卫生—生物医学工程]