Abstract:
Efforts to reduce the size of implanted microelectrodes and their supporting dielectric material are being driven by demands to reduce the foreign-body tissue response an...Show MoreMetadata
Abstract:
Efforts to reduce the size of implanted microelectrodes and their supporting dielectric material are being driven by demands to reduce the foreign-body tissue response and increase spatial resolution. Although the impact on recording performance of electrode size and shape have been analyzed in both prior and on-going work, the impact of the width of the surrounding dielectric has not. In this work we use the FEM-reciprocity method, informed by NEURON, to examine the impact of dielectric widths, ranging from 1 to 256 \mu \mathrm{m}, on the range and shape of the recording volume around 8- \mu \mathrm{m}-diameter disc electrodes located inside a 700-\mu \mathrm{m}-diameter fascicle. We observe that reducing the width of the dielectric not only can reduce the recording range by up to 1/3 but also changes the region of tissue recorded from only above the electrode to equally above and below the electrode. As the width of the dielectric is scaled down, these observed impacts occur at different levels for different diameters fibers.
Date of Conference: 04-06 May 2021
Date Added to IEEE Xplore: 02 June 2021
ISBN Information: