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Computerized 22-channel stimulator for limb movement.

R Davis1, R Eckhouse, J F Patrick

  • 1Veterans Administration Medical Center, Togus, Maine.

Applied Neurophysiology
|January 1, 1987
PubMed
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This study modified a hearing prosthesis into a functional electrical stimulator for nerve activation. Researchers successfully used it to control limb movements in rabbits, paving the way for wearable devices for paraplegics.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Rehabilitation Technology

Background:

  • Implantable hearing prostheses offer precise electrical stimulation capabilities.
  • Functional electrical stimulation (FES) is a promising approach for restoring movement.

Purpose of the Study:

  • To adapt a Nucleus 22-channel implantable hearing prosthesis into a programmable functional electrical stimulator.
  • To evaluate the efficacy of this modified device for nerve activation and limb movement control.

Main Methods:

  • The Nucleus 22-channel hearing prosthesis was reprogrammed into a functional electrical stimulator.
  • Individual or multiple stimulation channels were sequenced and adjusted for pulse parameters (amplitude, width, frequency).
  • Sciatic nerve branches in anesthetized rabbits were stimulated to elicit muscle contractions and joint movements.

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Main Results:

  • The modified device successfully activated single and multiple nerves, achieving controlled muscle contractions.
  • Both single contractions and co-contractions at the ankle were produced.
  • Simultaneous bilateral joint movements were demonstrated.
  • The spiral (Helix) electrode proved suitable for nerve stimulation.

Conclusions:

  • A modified hearing prosthesis can serve as an effective functional electrical stimulator for nerve activation.
  • This technology shows potential for developing wearable ambulation units for individuals with paraplegia.