Improving Deep Brain Stimulation Electrode Performance in vivo Through Use of Conductive Hydrogel Coatings

Active implantable neurological devices like deep brain stimulators have been used over the past few decades to treat movement disorders such as those in people with Parkinson’s disease and more recently, in psychiatric conditions like obsessive compulsive disorder. Electrode-tissue interfaces that...

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Autores principales:	Tomoko Hyakumura, Ulises Aregueta-Robles, Wenlu Duan, Joel Villalobos, Wendy K. Adams, Laura Poole-Warren, James B. Fallon
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	conductive hydrogel deep brain stimulation neural stimulation electrode coating tissue response electrical properties Neurosciences. Biological psychiatry. Neuropsychiatry RC321-571
Acceso en línea:	https://doaj.org/article/0134d388bd7340dc9d132e0b87dc692d
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spelling	oai:doaj.org-article:0134d388bd7340dc9d132e0b87dc692d2021-11-05T10:42:24ZImproving Deep Brain Stimulation Electrode Performance in vivo Through Use of Conductive Hydrogel Coatings1662-453X10.3389/fnins.2021.761525https://doaj.org/article/0134d388bd7340dc9d132e0b87dc692d2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fnins.2021.761525/fullhttps://doaj.org/toc/1662-453XActive implantable neurological devices like deep brain stimulators have been used over the past few decades to treat movement disorders such as those in people with Parkinson’s disease and more recently, in psychiatric conditions like obsessive compulsive disorder. Electrode-tissue interfaces that support safe and effective targeting of specific brain regions are critical to success of these devices. Development of directional electrodes that activate smaller volumes of brain tissue requires electrodes to operate safely with higher charge densities. Coatings such as conductive hydrogels (CHs) provide lower impedances and higher charge injection limits (CILs) than standard platinum electrodes and support safer application of smaller electrode sizes. The aim of this study was to examine the chronic in vivo performance of a new low swelling CH coating that supports higher safe charge densities than traditional platinum electrodes. A range of hydrogel blends were engineered and their swelling and electrical performance compared. Electrochemical performance and stability of high and low swelling formulations were compared during insertion into a model brain in vitro and the formulation with lower swelling characteristics was chosen for the in vivo study. CH-coated or uncoated Pt electrode arrays were implanted into the brains of 14 rats, and their electrochemical performance was tested weekly for 8 weeks. Tissue response and neural survival was assessed histologically following electrode array removal. CH coating resulted in significantly lower voltage transient impedance, higher CIL, lower electrochemical impedance spectroscopy, and higher charge storage capacity compared to uncoated Pt electrodes in vivo, and this advantage was maintained over the 8-week implantation. There was no significant difference in evoked potential thresholds, signal-to-noise ratio, tissue response or neural survival between CH-coated and uncoated Pt groups. The significant electrochemical advantage and stability of CH coating in the brain supports the suitability of this coating technology for future development of smaller, higher fidelity electrode arrays with higher charge density requirement.Tomoko HyakumuraTomoko HyakumuraUlises Aregueta-RoblesWenlu DuanJoel VillalobosJoel VillalobosWendy K. AdamsLaura Poole-WarrenLaura Poole-WarrenJames B. FallonJames B. FallonFrontiers Media S.A.articleconductive hydrogeldeep brain stimulationneural stimulationelectrode coatingtissue responseelectrical propertiesNeurosciences. Biological psychiatry. NeuropsychiatryRC321-571ENFrontiers in Neuroscience, Vol 15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	conductive hydrogel deep brain stimulation neural stimulation electrode coating tissue response electrical properties Neurosciences. Biological psychiatry. Neuropsychiatry RC321-571
spellingShingle	conductive hydrogel deep brain stimulation neural stimulation electrode coating tissue response electrical properties Neurosciences. Biological psychiatry. Neuropsychiatry RC321-571 Tomoko Hyakumura Tomoko Hyakumura Ulises Aregueta-Robles Wenlu Duan Joel Villalobos Joel Villalobos Wendy K. Adams Laura Poole-Warren Laura Poole-Warren James B. Fallon James B. Fallon Improving Deep Brain Stimulation Electrode Performance in vivo Through Use of Conductive Hydrogel Coatings
description	Active implantable neurological devices like deep brain stimulators have been used over the past few decades to treat movement disorders such as those in people with Parkinson’s disease and more recently, in psychiatric conditions like obsessive compulsive disorder. Electrode-tissue interfaces that support safe and effective targeting of specific brain regions are critical to success of these devices. Development of directional electrodes that activate smaller volumes of brain tissue requires electrodes to operate safely with higher charge densities. Coatings such as conductive hydrogels (CHs) provide lower impedances and higher charge injection limits (CILs) than standard platinum electrodes and support safer application of smaller electrode sizes. The aim of this study was to examine the chronic in vivo performance of a new low swelling CH coating that supports higher safe charge densities than traditional platinum electrodes. A range of hydrogel blends were engineered and their swelling and electrical performance compared. Electrochemical performance and stability of high and low swelling formulations were compared during insertion into a model brain in vitro and the formulation with lower swelling characteristics was chosen for the in vivo study. CH-coated or uncoated Pt electrode arrays were implanted into the brains of 14 rats, and their electrochemical performance was tested weekly for 8 weeks. Tissue response and neural survival was assessed histologically following electrode array removal. CH coating resulted in significantly lower voltage transient impedance, higher CIL, lower electrochemical impedance spectroscopy, and higher charge storage capacity compared to uncoated Pt electrodes in vivo, and this advantage was maintained over the 8-week implantation. There was no significant difference in evoked potential thresholds, signal-to-noise ratio, tissue response or neural survival between CH-coated and uncoated Pt groups. The significant electrochemical advantage and stability of CH coating in the brain supports the suitability of this coating technology for future development of smaller, higher fidelity electrode arrays with higher charge density requirement.
format	article
author	Tomoko Hyakumura Tomoko Hyakumura Ulises Aregueta-Robles Wenlu Duan Joel Villalobos Joel Villalobos Wendy K. Adams Laura Poole-Warren Laura Poole-Warren James B. Fallon James B. Fallon
author_facet	Tomoko Hyakumura Tomoko Hyakumura Ulises Aregueta-Robles Wenlu Duan Joel Villalobos Joel Villalobos Wendy K. Adams Laura Poole-Warren Laura Poole-Warren James B. Fallon James B. Fallon
author_sort	Tomoko Hyakumura
title	Improving Deep Brain Stimulation Electrode Performance in vivo Through Use of Conductive Hydrogel Coatings
title_short	Improving Deep Brain Stimulation Electrode Performance in vivo Through Use of Conductive Hydrogel Coatings
title_full	Improving Deep Brain Stimulation Electrode Performance in vivo Through Use of Conductive Hydrogel Coatings
title_fullStr	Improving Deep Brain Stimulation Electrode Performance in vivo Through Use of Conductive Hydrogel Coatings
title_full_unstemmed	Improving Deep Brain Stimulation Electrode Performance in vivo Through Use of Conductive Hydrogel Coatings
title_sort	improving deep brain stimulation electrode performance in vivo through use of conductive hydrogel coatings
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/0134d388bd7340dc9d132e0b87dc692d
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Improving Deep Brain Stimulation Electrode Performance in vivo Through Use of Conductive Hydrogel Coatings

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