Istituto di Ingegneria Biomedica     
Tognola G., Parazzini M., Norgia M., Pesatori A., Di Rienzo L., Burdo S., Svelto C., Ravazzani P., Grandori F. Experimental measurement of current excitation and numerical estimation of electrical fields generated by cochlear implants. In: Audio Infos, vol. - pp. 20 - 25. -, 2005.
Electric potential field distribution induced in physiological tissues by biphasic current pulses, generated by a cochlear implant electrode array, was calculated by mathematical modelin the electrical properties of the human cochlea and of the electrode array. At the same time it was planned an experimental setup to measure the waveform characteristics of the current stimulus delivered through the electrode array. Theoretical measurements were done under different stimulation conditions, i.e. by considering different electrode shapes and configurations, stimulus intensities, pulse stimulation rate, and pulse durations. All these parameters were found to affect the resulting fields potentials. Preliminary results of this study provide a deeper knowledge of the relationship beetween the stimulation parameters and the actually delivered electric field, which is crucial to develop more efficient and spatially focused excitations of cochlear neural tissues.
Subject cochlear implants
electrical fields

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