Thin film platinum cuff electrodes for neurostimulation: in vitro approach of safe neurostimulation parameters

S Mailley, M Hyland, P Mailley, JAD McLaughlin, ET McAdams

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Thin film technology takes more and more importance in the development of biomedical devices dedicated to functional neurostimulation. Our research about the design of implant neurostimulating electrode is oriented toward thin film cuff electrodes based on a polyimide substrate covered by a chromium/gold/Pt film. The chromium/gold sputtered film serves as adhesion layer and current collector whereas platinum acts as an electrochemical actuator. The electrode surface has been designed to obey safe stimulation criteria (i.e. chemically inert noble metal, low electrode-electrolyte impedance, high electrochemical reversibility, high corrosion stability). The electrochemical behaviour of such platinum electrodes has been assessed and compared to a foil of platinum. Extensive in vitro characterisations of the both electrode types were carried out using AFM, SEM and electrochemical techniques. The role of enhanced surface roughness enabling high double layer capacitances to be achieved was clearly highlighted. The obtained results are discussed, with particular reference to thin film electrodes stability under in vitro electrical stimulation in NaCl 0.9% (physiological serum). Therefore, these thin film devices showed reversible PtOH formation and decomposition making them potentially attractive for the fabrication of implant stimulation cuff electrodes. (C) 2004 Elsevier B.V. All rights reserved.
LanguageEnglish
Pages359-364
JournalBioelectrochemistry
Volume63
Issue number1-2
DOIs
Publication statusPublished - Jun 2004

Fingerprint

cuffs
Platinum
Electrodes
platinum
Thin films
electrodes
thin films
stimulation
Chromium
Gold
chromium
Electrochemical Techniques
gold
Thin film devices
Equipment and Supplies
Corrosion
In Vitro Techniques
Precious metals
noble metals
Electric Impedance

Keywords

  • platinum implant electrode
  • cuff electrode
  • neurostimulation
  • AC impedance

Cite this

Mailley, S ; Hyland, M ; Mailley, P ; McLaughlin, JAD ; McAdams, ET. / Thin film platinum cuff electrodes for neurostimulation: in vitro approach of safe neurostimulation parameters. In: Bioelectrochemistry. 2004 ; Vol. 63, No. 1-2. pp. 359-364.
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Thin film platinum cuff electrodes for neurostimulation: in vitro approach of safe neurostimulation parameters. / Mailley, S; Hyland, M; Mailley, P; McLaughlin, JAD; McAdams, ET.

In: Bioelectrochemistry, Vol. 63, No. 1-2, 06.2004, p. 359-364.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Mailley, S

AU - Hyland, M

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AU - McLaughlin, JAD

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AB - Thin film technology takes more and more importance in the development of biomedical devices dedicated to functional neurostimulation. Our research about the design of implant neurostimulating electrode is oriented toward thin film cuff electrodes based on a polyimide substrate covered by a chromium/gold/Pt film. The chromium/gold sputtered film serves as adhesion layer and current collector whereas platinum acts as an electrochemical actuator. The electrode surface has been designed to obey safe stimulation criteria (i.e. chemically inert noble metal, low electrode-electrolyte impedance, high electrochemical reversibility, high corrosion stability). The electrochemical behaviour of such platinum electrodes has been assessed and compared to a foil of platinum. Extensive in vitro characterisations of the both electrode types were carried out using AFM, SEM and electrochemical techniques. The role of enhanced surface roughness enabling high double layer capacitances to be achieved was clearly highlighted. The obtained results are discussed, with particular reference to thin film electrodes stability under in vitro electrical stimulation in NaCl 0.9% (physiological serum). Therefore, these thin film devices showed reversible PtOH formation and decomposition making them potentially attractive for the fabrication of implant stimulation cuff electrodes. (C) 2004 Elsevier B.V. All rights reserved.

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