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Human nerve stimulation thresholds and selectivity using a multi-contact nerve cuff electrode.

Katharine H Polasek1, Harry A Hoyen, Michael W Keith

  • 1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA. katharine.polasek@case.edu

IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
|April 18, 2007
PubMed
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This study evaluated nerve cuff electrodes in humans, finding they can selectively activate muscles with a low stimulation threshold. These findings are crucial for developing advanced neuroprosthetics for individuals with paralysis.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Rehabilitation Technology

Background:

  • Nerve cuff electrodes are promising for restoring function in paralysis.
  • Previous research primarily focused on animal models.
  • Human data on recruitment and selectivity is limited.

Purpose of the Study:

  • To assess the recruitment properties and selective activation of a multi-contact spiral nerve cuff electrode in human subjects.
  • To provide preliminary data for chronic implantation in individuals with high tetraplegia.

Main Methods:

  • Intraoperative testing in 21 human subjects across two phases: exploratory (10 subjects) and systematic (11 subjects).
  • Measurement of stimulation thresholds and selectivity (percentage of first muscle recruited before another reaches threshold).

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Main Results:

  • Mean stimulation threshold was 25 +/- 17 nC, comparable to animal models and lower than muscle electrodes.
  • Selectivity ranged from 27% to 97% (mean 55%), with selective activation occurring at the first muscle branch distal to the cuff.
  • Consistently activated the first distal muscle branch.

Conclusions:

  • Multi-contact spiral nerve cuff electrodes demonstrate effective and selective muscle activation in humans.
  • Results support the potential of these electrodes for neuroprosthetic applications in high tetraplegia.
  • Further evaluation is warranted before chronic implantation.