Sensitivity and selectivity of intraneural stimulation using a silicon electrode array

Rutten, Wim L.C. and Wier van , Harmen J. and Put, Johan H.M. (1991) Sensitivity and selectivity of intraneural stimulation using a silicon electrode array. IEEE Transactions on Biomedical Engineering, 38 (2). pp. 192-198. ISSN 0018-9294

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Abstract:	A multielectrode array in silicon technology, as well as experimental paradigms and model calculations for sensitivity and selectivity measures, have been developed. The array consists of twelve platinum electrode sites (10×50 ¿m and 50 ¿m interdistance) on a 45-¿m thick tip-shaped silicon substrate and a Si3N 4 insulating glass cover layer. The tip is inserted in the peroneal nerve of a rat during acute experiments to stimulate ¿ motor fibers or the extensor digitorum longus muscle. Sensitivity calculations and experiments show a cubic dependence of the number of stimulated motor units on current amplitude of the stimulatory pulse (recruitment curves), starting at single motor level. Selectivity was tested by a method based on the refractory properties of neurons. At the lowest stimulus levels (for one motor unit) selectivity is maximal when two electrodes are separated by 200-250 ¿m, which was also estimated on theoretical grounds. The study provides clues for future designs of two- and three-dimensional devices
Item Type:	Article
Copyright:	©1991 IEEE
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Biomedical Signals and Systems (BSS)
Link to this item:	http://purl.utwente.nl/publications/15337
Official URL:	http://dx.doi.org/10.1109/10.76386
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