科研之友
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摘要
Our objectives were to develop and test a new system for the potential for stable real time cancellation of residual stimulation artefacts (RSA) using surface electrode autogenic electromyography controlled functional electrical stimulator (aEMGcFES) This type of closed loop FES could be used to provide more natural continuous control of lower extremity paretic muscles We built upon work that has been done in the field of FES with one major technological innovation an adaptive Gram-Schmidt filtering algorithm which allowed us to digitally cancel RSA in real time This filtering algorithm resulted in a stable real time estimation of the volitional intent of the stimulated muscle which then acted as the direct signal for continuously controlling homonymous muscle stimulation As a first step toward clinical application we tested the viability of our aEMGcFES system to continuously control ankle dorsiflexion in a healthy subject Our results indicate positively that an aEMGcFES device with adaptive filtering can respond proportionally to voluntary EMG and activate forceful movements to assist dorsiflexion during controlled isometric activation at the ankle We also verified that normal ankle joint range of movement could be maintained while using the aEMGcFES system We suggest that real time cancellation of both primary and RSA is possible with surface electrode
- 出版日期2010-10-30
