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  4. Three-dimensional multilayer concentric bipolar electrodes restrict spatial activation in optic nerve stimulation
 
research article

Three-dimensional multilayer concentric bipolar electrodes restrict spatial activation in optic nerve stimulation

Borda, Eleonora  
•
Gaillet, Vivien  
•
Leccardi, Marta Jole Ildelfonsa Airaghi  
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June 1, 2022
Journal Of Neural Engineering

Objective. Intraneural nerve interfaces often operate in a monopolar configuration with a common and distant ground electrode. This configuration leads to a wide spreading of the electric field. Therefore, this approach is suboptimal for intraneural nerve interfaces when selective stimulation is required. Approach. We designed a multilayer electrode array embedding three-dimensional concentric bipolar (CB) electrodes. First, we validated the higher stimulation selectivity of this new electrode array compared to classical monopolar stimulation using simulations. Next, we compared them in-vivo by intraneural stimulation of the rabbit optic nerve and recording evoked potentials in the primary visual cortex. Main results. Simulations showed that three-dimensional CB electrodes provide a high localisation of the electric field in the tissue so that electrodes are electrically independent even for high electrode density. Experiments in-vivo highlighted that this configuration restricts spatial activation in the visual cortex due to the fewer fibres activated by the electric stimulus in the nerve. Significance. Highly focused electric stimulation is crucial to achieving high selectivity in fibre activation. The multilayer array embedding three-dimensional CB electrodes improves selectivity in optic nerve stimulation. This approach is suitable for other neural applications, including bioelectronic medicine.

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Type
research article
DOI
10.1088/1741-2552/ac6d7e
Web of Science ID

WOS:000800663000001

Author(s)
Borda, Eleonora  
Gaillet, Vivien  
Leccardi, Marta Jole Ildelfonsa Airaghi  
Zollinger, Elodie Genevieve
Moreira, Ricardo Camilo
Ghezzi, Diego  
Date Issued

2022-06-01

Publisher

IOP Publishing Ltd

Published in
Journal Of Neural Engineering
Volume

19

Issue

3

Article Number

036016

Subjects

Engineering, Biomedical

•

Neurosciences

•

Engineering

•

Neurosciences & Neurology

•

electrical stimulation

•

concentric bipolar

•

optic nerve

•

neuroprosthetics

•

artificial vision

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intraneural array

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selectivity

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visual-cortex

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prosthesis

•

devices

•

array

•

model

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LNE  
Available on Infoscience
June 6, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/188251
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