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Tissue damage thresholds during therapeutic electrical stimulation.

Stuart F Cogan1, Kip A Ludwig, Cristin G Welle

  • 1The Department of Bioengineering, The University of Texas at Dallas, Richardson, TX, USA.

Journal of Neural Engineering
|January 22, 2016
PubMed
Summary
This summary is machine-generated.

New bioelectronic therapies require re-evaluating electrical stimulation safety thresholds. Microelectrodes may need higher charge densities than macroelectrodes, necessitating distinct safety parameters and testing for tissue damage.

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Area of Science:

  • Bioelectronic Medicine
  • Neuroscience
  • Biomedical Engineering

Background:

  • Recent initiatives in bioelectronic modulation (e.g., SPARC, ElectRx) are advancing therapeutic electrical stimulation.
  • These advancements necessitate a re-evaluation of established safety thresholds for stimulation-induced tissue damage.

Purpose of the Study:

  • To review the current literature on tissue damage from electrical stimulation.
  • To identify knowledge gaps and factors influencing tissue damage thresholds.

Main Methods:

  • Literature review of published studies on electrical stimulation and tissue damage.
  • Analysis of factors influencing damage thresholds, including charge density, pulse parameters, and electrode size.
  • Comparison of findings for macroelectrodes versus microelectrodes.

Main Results:

  • The Shannon equation, commonly used for macroelectrodes, has limitations and does not fully capture tissue damage mechanisms.
  • Factors like pulse frequency, duty cycle, current density, and electrode size influence tissue damage.
  • Microelectrodes exhibit different damage characteristics and may not adhere to the charge density/phase charge co-dependence described by the Shannon equation.

Conclusions:

  • Emerging applications, particularly with microelectrodes, may require charge densities exceeding traditional thresholds.
  • Experimental data suggest higher charge densities are possible without damage, indicating distinct safety parameters for microelectrodes.
  • Justification through bench, non-clinical, or clinical testing is crucial to ensure the safety of devices using these increased charge densities.