Electrochemical evaluation of a multi-site clinical depth recording electrode for monitoring cerebral tissue oxygen

Ana Ledo, Eliana Fernandes, Jorge E. Quintero, Greg A. Gerhardt, Rui M. Barbosa

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The intracranial measurement of local cerebral tissue oxygen levels-PbtO2-has become a useful tool for the critical care unit to investigate severe trauma and ischemia injury in patients. Our preliminary work in animal models supports the hypothesis that multi-site depth electrode recording of PbtO2 may give surgeons and critical care providers needed information about brain viability and the capacity for better recovery. Here, we present a surface morphology characterization and an electrochemical evaluation of the analytical properties toward oxygen detection of an FDA-approved, commercially available, clinical grade depth recording electrode comprising 12 Pt recording contacts. We found that the surface of the recording sites is composed of a thin film of smooth Pt and that the electrochemical behavior evaluated by cyclic voltammetry in acidic and neutral electrolyte is typical of polycrystalline Pt surface. The smoothness of the Pt surface was further corroborated by determination of the electrochemical active surface, confirming a roughness factor of 0.9. At an optimal working potential of-0.6 V vs. Ag/AgCl, the sensor displayed suitable values of sensitivity and limit of detection for in vivo PbtO2 measurements. Based on the reported catalytical properties of Pt toward the electroreduction reaction of O2, we propose that these probes could be repurposed for multisite monitoring of PbtO2 in vivo in the human brain.

Original languageEnglish
Article number632
Issue number7
StatePublished - Jul 2020

Bibliographical note

Funding Information:
Acknowledgments: Additional support was provided through the University of Kentucky Brain Restoration Center and the Integra electrodes were provided in-kind by Integra LifeSciences.

Funding Information:
Funding: This work was financed by the European Regional Development Fund (ERDF) through the COMPETE 2020 – Operational Programme for Competitiveness and Internationalization and Portuguese national funds via FCT – Fundação para a Ciência e Tecnologia, under projects POCI-01-0145-FEDER-028261 and UIDB/04539/2020.

Publisher Copyright:
© 2020 by the authors.


  • Brain tissue oxygen
  • In vivo monitoring
  • Multi-site clinical depth electrode

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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