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A Novel Waveform for No-Onset Nerve Block Combining Direct Current and Kilohertz Frequency Alternating Current.

Tina L Vrabec1, Niloy Bhadra1, Jesse S Wainright1

  • 1Case Western Reserve University 10900 Euclid Ave., Cleveland, Ohio 44106.

International IEEE/EMBS Conference on Neural Engineering : [Proceedings]. International IEEE EMBS Conference on Neural Engineering
|September 18, 2024
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Kilohertz frequency alternating current (KHFAC) nerve blocks can be improved by combining direct current (DC) with KHFAC. A novel waveform delivered via a single electrode effectively prevents the disruptive "onset response" without nerve damage.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Electrophysiology

Background:

  • Kilohertz frequency alternating current (KHFAC) offers rapid, reversible nerve blockade.
  • A significant limitation of KHFAC is the "onset response," an intense nerve firing burst at initiation.
  • Current methods to mitigate the onset response, like brief direct current (DC) application, are limited by potential nerve damage.

Purpose of the Study:

  • To develop a novel waveform that eliminates the KHFAC "onset response" without causing nerve damage.
  • To investigate the efficacy of combining DC and KHFAC in a single, monopolar electrode delivery system.
  • To validate the novel waveform's performance in both computational simulations and in vivo animal models.

Main Methods:

  • Development of a novel combined DC and KHFAC waveform.
  • Utilizing high surface area electrodes for safe, prolonged DC delivery.
  • Testing the waveform's effectiveness in computational simulations.
  • In vivo testing on rat sciatic nerves.

Main Results:

  • The novel waveform successfully prevented the "onset response" in simulations.
  • In vivo experiments demonstrated the waveform's ability to eliminate the onset response in rat sciatic nerves.
  • The combined waveform achieved nerve block without apparent nerve damage.

Conclusions:

  • A novel, single-electrode waveform effectively combines DC and KHFAC to achieve nerve blockade without the detrimental "onset response".
  • This approach overcomes the limitations of previous methods, offering a safer and more efficient nerve blocking technique.
  • The findings support the potential of this technology for clinical applications requiring precise nerve modulation.