基于模糊逻辑算法的智能膝关节假肢步态相位识别  

Gait phase recognition in intelligent above-knee prosthesis based on fuzzy logic algorithm

作　　者：张意彬 吕杰[1] 喻洪流 ZHANG Yibin;LÜJie;YU Hongliu(Medical Instruments Institute,Shanghai University of Medicine&Health Sciences,Shanghai 201318,China;School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海健康医学院医疗器械学院,上海市201318 [2]上海理工大学健康科学与工程学院,上海市200093

出　　处：《中国康复理论与实践》2023年第8期896-902,共7页Chinese Journal of Rehabilitation Theory and Practice

基　　金：国家自然科学基金项目(No.62073224)。

摘　　要：目的针对智能膝关节假肢控制策略切换的需要,以人体行走的足底压力为研究对象,以模糊逻辑算法为基础,提出一种基于假肢足底压力信息的步态相位划分方法。方法利用安装在假脚足底的3个薄膜压力传感器采集测试对象在3种不同行走模式(平路行走、下坡行走、下楼行走)下的足底压力信息,经数据融合处理后,送入模糊逻辑控制器,建立IF-THEN规则,通过调整灵敏度系数Ai以及比例系数Bi,输出识别结果。结果经过对5例健康人的模拟测试,平路行走、下楼行走和下坡行走的步态相位识别准确率分别为(95.3±2.4)%、(81.5±6.3)%和(90.7±3.5)%。结论最终的识别准确率满足使用需求,该方法可以在智能膝关节假肢的步态相位识别中应用。Objective Aiming at the need of control strategy switching of intelligent above-knee prosthetic,taking the plantar pressure of human walking as the research object,and based on fuzzy logic algorithm,a gait phase division method based on plantar pressure of prosthetic is proposed.Methods Three flexible force sensors installed on the soles of the false feet were used to collect the plantar pressure information of the test object under three different walking modes(walking on the flat road,walking downhill and walking down the stairs).After data fusion processing,it was sent to the fuzzy logic controller,and the recognition results were output according to the IF-THEN rule,the scale and sensitivity factor.Results Through the testing of five healthy people as substitute,the results showed that the accuracy of gait phase recognition for walking on the flat road,walking down the stairs and walking downhill were(95.3±2.4)%,(81.5±6.3)%and(90.7±3.5)%,respectively.Conclusion The accuracy of recognition basically meets the requirements in this project.This method can be applied in the gait phase recognition of intelligent above-knee prosthetic.

关 键 词：膝关节假肢 步态检测 足底反力 模糊逻辑 步态相位 

分 类 号：R496[医药卫生—康复医学]