Cited by 204Neuroscience and Neural EngineeringElectrochemical sensors and biosensorsConducting polymers and applications

Chronic in vivo stability assessment of carbon fiber microelectrode arrays

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Patel, Paras R, Zhang, Huanan, Robbins, Matthew T, Nofar, Justin B, Marshall, Shaun P, Kobylarek, Michael J, Kozai, Takashi D Y, Kotov, Nicholas A +1 more·2016·Journal of Neural Engineering

Abstract

OBJECTIVE: Individual carbon fiber microelectrodes can record unit activity in both acute and semi-chronic (∼1 month) implants. Additionally, new methods have been developed to insert a 16 channel array of carbon fiber microelectrodes. Before assessing the in vivo long-term viability of these arrays, accelerated soak tests were carried out to determine the most stable site coating material. Next, a multi-animal, multi-month, chronic implantation study was carried out with carbon fiber microelectrode arrays and silicon electrodes. APPROACH: Carbon fibers were first functionalized with one of two different formulations of PEDOT and subjected to accelerated aging in a heated water bath. After determining the best PEDOT formula to use, carbon fiber arrays were chronically implanted in rat motor cortex. Some rodents were also implanted with a single silicon electrode, while others received both. At the end of the study a subset of animals were perfused and the brain tissue sliced. Tissue sections were stained for astrocytes, microglia, and neurons. The local reactive responses were assessed using qualitative and quantitative methods. MAIN RESULTS: Electrophysiology recordings showed the carbon fibers detecting unit activity for at least 3 months with average amplitudes of ∼200 μV. Histology analysis showed the carbon fiber arrays with a minimal to non-existent glial scarring response with no adverse effects on neuronal density. Silicon electrodes showed large glial scarring that impacted neuronal counts. SIGNIFICANCE: This study has validated the use of carbon fiber microelectrode arrays as a chronic neural recording technology. These electrodes have demonstrated the ability to detect single units with high amplitude over 3 months, and show the potential to record for even longer periods. In addition, the minimal reactive response should hold stable indefinitely, as any response by the immune system may reach a steady state after 12 weeks.

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  • Reduction of the cross-sectional area of electrodes and use of more flexible and soft materials that better match surrounding tissue have been investigated as strategies for minimizing trauma and inflammatory responses.

    “several strategies for minimizing trauma and the inflammatory responses have been investigated, for example, the reduction of the cross-sectional area of the electrodes (Seymour and Kipke, 2007) and the use of more flexible and soft materials that better match the properties of the surrounding tissue”

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Authors
Patel, P. R., Zhang, H., Robbins, M. T., Nofar, J. B., Marshall, S. P., Kobylarek, M. J., Kozai, T. D. Y., Kotov, N. A., & Chestek, C. A.
Affiliations
  • University of Michigan (US)
  • University of Pittsburgh (US)
Corresponding author
  • Patel, Paras R
  • Zhang, Huanan
  • Robbins, Matthew T
  • Nofar, Justin B
  • Marshall, Shaun P
  • Kobylarek, Michael J
  • Kozai, Takashi D Y
  • Kotov, Nicholas A
  • Chestek, Cynthia A
Venue
Journal of Neural Engineering
Published
2016-10-05
Volume
13
Issue
6
Pages
066002
ISSN
  • 1741-2552 (ISSN-L)
  • 1741-2560
OpenAlex
W2529123936
Cited by
204
References
77
Citations by year
2026: 11 · 2025: 14 · 2024: 17 · 2023: 18 · 2022: 16 · 2021: 34 · 2020: 34 · 2019: 24 · 2018: 24 · 2017: 9 · 2016: 2
FWCI
11.03
Type
journal article
Language
en
Open access
Locations
  • Journal of Neural Engineering (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • McKnight Foundation
  • National Institute of Neurological Disorders and Stroke (1R01NS094396)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neural Engineering
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrochemical sensors and biosensors
  • Physical Sciences › Materials Science › Polymers and Plastics › Conducting polymers and applications
Keywords
chronic neural recording, electrode stability, PEDOT coating, accelerated aging, glial scar, silicon electrodes, single-unit recording
MeSH terms
Carbon Fiber, Animals, Astrocytes, Carbon, Cell Count, Electrodes, Implanted, Microcomputers, Microelectrodes, Motor Cortex, Neurons, Silicon, Microglia, Rats, Electrophysiological Phenomena, Signal-To-Noise Ratio

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