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Related Experiment Video

Updated: May 17, 2026

Voltage Biasing, Cyclic Voltammetry, & Electrical Impedance Spectroscopy for Neural Interfaces
07:51

Voltage Biasing, Cyclic Voltammetry, & Electrical Impedance Spectroscopy for Neural Interfaces

Published on: February 24, 2012

Impedance variations over time for a closed-loop neurostimulation device: early experience with chronically implanted

Chengyuan Wu1, James J Evans, Christopher Skidmore

  • 1Department of Neurological Surgery, Thomas Jefferson University, Philadelphia, PA 19107, USA. chengyuan.wu@jeffersonhospital.org

Neuromodulation : Journal of the International Neuromodulation Society
|November 10, 2012
PubMed
Summary

Responsive neurostimulation (RNS) device impedance remained stable in patients with epilepsy over three years. Depth electrodes showed more stability than strip electrodes, ensuring consistent therapeutic delivery for chronic intracranial implants.

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Last Updated: May 17, 2026

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Published on: February 24, 2012

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Published on: July 14, 2020

Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Epilepsy Research

Background:

  • Responsive neurostimulation (RNS) is an investigational treatment for intractable focal epilepsy.
  • Long-term electrode stability is crucial for effective chronic intracranial neural implants.

Purpose of the Study:

  • To analyze impedance values of RNS devices over time.
  • To compare electrode stability between depth and strip types.
  • To assess implications for long-term implantation.

Main Methods:

  • Retrospective review of impedance measurements from seven patients over three years.
  • Statistical analysis of impedance trends and differences between electrode types.

Main Results:

  • Depth electrodes had lower mean impedances and less variation than subdural strip electrodes.
  • Depth electrode impedance remained stable; subdural electrode impedance increased then returned to baseline by two years.

Conclusions:

  • The RNS device demonstrates long-term data on electrode performance in humans.
  • Observed impedance variations were clinically insignificant, ensuring stable therapeutic doses.
  • Relative impedance stability suggests promise for future chronic intracranial neural implants.