Feedback control of coronal plane hip angle in paraplegic subjects using functional neuromuscular stimulation
Feedback control of coronal plane hip angle in paraplegic subjects using functional neuromuscular stimulation
复制标题
使用功能性神经肌肉刺激对截瘫受试者冠状面髋角进行反馈控制
DOI：
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发表时间：
1991
影响因子：
4.6
通讯作者：
H. Chizeck
中科院分区：
文献类型：
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作者：
James J. Abbas;H. Chizeck
对截瘫患者使用功能性神经肌肉刺激(FNS)站立时的冠状面姿势反馈控制进行了研究。设计、实现了一套针对中立位调节冠状面髋关节角度的反馈控制系统，并在两名截瘫患者身上进行了评估。反馈控制器由两级串联组成：改进的离散时间比例积分导数(PID)阶段和非线性单输入多输出阶段，以确定要发送给多个肌肉的刺激。通过比较反馈控制系统和开环激励系统的响应来评价反馈控制器的性能。在基于时间响应特性的评估中，受控系统表现出均方根(RMS)误差(其中误差定义为与期望角度的偏差)减少41%，稳态误差减少52%，以及髋关节顺应性减少22%。反馈控制系统在几天的时间里也显示出这些指标的变异性显著降低。
An investigation of feedback control of coronal plane posture in paraplegic subjects who stand using functional neuromuscular stimulation (FNS) is described. A feedback control system directed at regulating coronal plane hip angle in neutral position was designed, implemented, and evaluated in two paraplegic subjects. The feedback controller consisted of two-stages in cascade: a modified discrete-time proportional-integral-derivative (PID) stage and a nonlinear single-input, multiple-output stage to determine the stimulation to be sent to several muscles. The authors evaluate the performance of the feedback controller by comparing the response of the feedback-controlled system to that of an open-loop stimulation system. In an evaluation based on temporal response characteristics the controlled system exhibited at 41% reduction in root-mean-squared (RMS) error (where error is defined as the deviation from the desired angle), a 52% reduction in steady-state error, and a 22% reduction in hip compliance. The feedback-controlled system also exhibited significant reductions in the variability of these measures on several days.<<ETX>>