评估功能性电刺激治疗截瘫患者行走效率的三维重心动态图

3-D center of gravity mapping:a new method for assessment of FES-assisted paraplegic walking efficiency

目的 研究功能性电刺激 (functionalelectricalstimulation ,FES)治疗截瘫患者行走效率的评估方法。方法 介绍一种用三维重心动态图来评估FES治疗截瘫患者行走效率的新方法。其主要构件是一套基于标准步行器的测试系统 ,该系统可以实时获得上肢支撑力数据 ,通过一套截瘫上躯干力学模型转化为三维重心动态图来显示重心运动轨迹 ,从而客观定量地评估出用身体平衡状况表征的FES行走效率。结果 静态标定显示系统测试精确度好于 1.0 1% ,非线性度小于 0 .8% ,交互干扰小于 3 .2 %。相关测试结果来自正在接受FES行走训练的截瘫患者。结论 初步表明该方法可以用于 :(1)FES治疗截瘫患者行走效率的评估 ;(2 )患者自我训练的平衡控制指导 ;(3 )作为反馈信号选择一种有效的FES模式和阵列 。

Objective To explore a new method for assessing the walking efficiency of the paraplegic patients assisted by functional electrical stimulation (FES). Methods The measurement system based on a standard walker was developed. During FES assisted walking of the paraplegic, the real time of the upper limb support were obtained and transformed into a 3 D center of gravity (CG) motion map with a paraplegic upper body mechanical model to describe the CG motion locus. Then the FES efficiency indicated by walking balance condition was assessed objectively and quantitatively. Results In this design, the pilot study of a paraplegic patient undergoing walking training with FES showed that the force accuracy was better than 1.01%, nonlinearity was less than 0.8%, and crosstalk was less than 3.2%. Conclusion The results showed that this system may be used as 1) an evaluation index of FES assisted paraplegic walking efficiency, 2) a balance control indicator during FES assisted paraplegic walking training and 3) a feed back signal to choose an efficient FES pattern and sequence.