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Optimized electrode placement and improved EMG detection for a new textile grasping neuroprosthesis


M. Lawrence, Samuel Monteleoni, S. Micera

International Functional Electrical Stimulation Society Conference, Freiboug, Germany, vol. 13, pp. 409-411

Grasping neuroprostheses (NP) require accurately placed transcutaneous electrodes to achieve selective activa- tion of the extrinsic finger extensors and flexors. Commercial transcutaneous NP tend to use fixed electrode po- sitions encased in a semi rigid structure, which are not easy to reconfigure for individual users. Embroidered electrodes, with integrated wiring enable new designs in wearable and flexible grasping NP. Before designing new NP it is useful to determine how the transcutaneous optimal motor points (OMP) vary for different arm po- sitions in subjects. Measurements showed that OMPís for selective finger flexion can vary by up to 4cm during arm rotation. The position of the MPís for finger extension, and thumb flexion and adduction varied little during arm rotation; however movements of up to 1.5cm were found over multiple measurement sessions. Using these results it was possible to optimize the locations for electrodes embroidered into a textile NP. Controlling the new textile NP requires man machine interfaces that can seamlessly integrate with user intention. One technique is to use surface EMG to detect residual voluntary muscle activation within the affected limbs. The Teager-Kaiser En- ergy Operator was found to be useful in improving detection of weak voluntary finger extensor activity from two stroke subjects.


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S. Micera

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