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An implanted upper-extremity neuroprosthesis using myoelectric control.

Kevin L Kilgore1, Harry A Hoyen, Anne M Bryden

  • 1MetroHealth Medical Center, Cleveland, OH, USA. klk4@case.edu

The Journal of Hand Surgery
|April 15, 2008
PubMed
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This study shows a new implantable neuroprosthesis effectively restores hand grasp function for individuals with cervical spinal cord injury using electromyographic (EMG) signals for control.

Area of Science:

  • Biomedical Engineering
  • Neuroprosthetics
  • Rehabilitation Medicine

Background:

  • Cervical spinal cord injury significantly impairs hand and arm function.
  • Restoring function is crucial for independence and quality of life.
  • Existing neuroprosthetic technologies have limitations in intuitive control.

Purpose of the Study:

  • To evaluate a second-generation implantable neuroprosthesis for individuals with cervical spinal cord injury.
  • To assess the system's ability to restore hand grasp and elbow extension.
  • To determine the efficacy of using electromyographic (EMG) signals for neuroprosthetic control.

Main Methods:

  • Implantation of a neuroprosthesis with 12 stimulating and 2 EMG recording electrodes.
  • Subjects controlled stimulated functions via recorded EMG signals.

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  • Functional outcomes assessed using body functions, activity performance, and societal participation measures.

    • Main Results:

    • EMG signals were successfully recorded during electrical stimulation in all three subjects.
    • Significant improvements in pinch force and grasp function were observed.
    • The Activities of Daily Living Abilities Test showed improvement in at least 5 daily activities.
    • The device was successfully used at home with no system failures.

    Conclusions:

    • A neuroprosthesis with implanted myoelectric control is effective for restoring hand function in midcervical spinal cord injury.
    • This technology offers a promising avenue for functional recovery.
    • Further research may optimize electrode placement for enhanced performance.