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Related Experiment Videos

Chronic histological effects of the flat interface nerve electrode.

Daniel K Leventhal1, Mark Cohen, Dominique M Durand

  • 1Department of Biomedical Engineering, Neural Engineering Center, Case Western Reserve University, Cleveland, OH 44106, USA.

Journal of Neural Engineering
|May 18, 2006
PubMed
Summary

The flat interface nerve electrode (FINE) reshapes nerves into ovoid shapes for better stimulation. Moderate reshaping showed no damage, but extreme reshaping caused nerve injury, suggesting careful design is key for safe, selective electrodes.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Materials Science

Background:

  • Peripheral nerve stimulation requires precise electrode placement.
  • Current cylindrical electrodes offer limited space for contacts.
  • Ovoid nerve geometries may improve stimulation selectivity.

Purpose of the Study:

  • To histologically evaluate the nerve response to the flat interface nerve electrode (FINE).
  • To assess nerve reshaping and potential damage from different FINE designs.
  • To correlate nerve geometry changes with electrode performance.

Main Methods:

  • Three FINE designs ('wide', 'medium', 'narrow' cuffs) were implanted on cat sciatic nerves.
  • Nerves were harvested after 3 months for histological analysis.

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  • Nerve cross-sectional area and eccentricity were measured; fiber counts and axonal integrity were assessed.

    • Main Results:

    • Wide and medium FINE cuffs significantly reshaped nerves, increasing cross-sectional area.
    • Extensive connective tissue deposition occurred in all implanted nerves.
    • Narrow cuffs caused axonal injury and demyelination; wide and medium cuffs did not significantly alter fiber counts.

    Conclusions:

    • Ovoid nerve geometries created by FINEs can enable safer, more selective nerve stimulation.
    • Moderate nerve reshaping is well-tolerated, while extreme reshaping induces nerve damage.
    • FINE cuff redesign may allow for gradual nerve reshaping to prevent injury.