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Related Experiment Video

Updated: Aug 5, 2025

Preparation of Peripheral Nerve Stimulation Electrodes for Chronic Implantation in Rats
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Fractal Microelectrodes for More Energy-Efficient Cervical Vagus Nerve Stimulation.

Jongcheon Lim1,2,3, Calvin D Eiber4,5, Anina Sun6

  • 1Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, 47907, USA.

Advanced Healthcare Materials
|March 28, 2023
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Summary

Fractal microelectrodes offer a more energy-efficient approach to vagus nerve stimulation (VNS) by activating C-fibers with significantly less energy. This geometric advantage in VNS may lead to more targeted and effective treatments for peripheral dysfunctions.

Keywords:
fractalmicroelectrodesvagus nerve stimulation

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Medical Devices

Background:

  • Vagus nerve stimulation (VNS) holds therapeutic potential for peripheral dysfunctions.
  • Traditional cuff electrodes for VNS can cause off-target effects.
  • Microelectrodes offer selectivity but face challenges with impedance.

Purpose of the Study:

  • To evaluate the efficacy of fractal microelectrodes for VNS.
  • To compare the energy efficiency of fractal versus traditional circle microelectrodes in vivo.
  • To investigate the potential of non-Euclidean geometries for VNS.

Main Methods:

  • Fabrication of a thin-film device with both fractal and circle microelectrodes.
  • In vivo testing in a rodent model (N=3).
  • Comparison of neural stimulation performance at the same radial nerve coordinate.

Main Results:

  • Fractal microelectrodes demonstrated superior energy efficiency.
  • Activation of C-fibers using fractal electrodes required up to 52% less energy (p=0.012) compared to circle electrodes.
  • This study is the first to show a geometric advantage for fractal microelectrodes in VNS.

Conclusions:

  • Fractal microelectrodes represent a promising advancement for VNS.
  • The geometric design of microelectrodes can significantly improve energy efficiency.
  • This technology may mitigate off-target effects and enhance VNS treatment efficacy.