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Related Experiment Videos

Control of functional electrical stimulation with extended physiological proprioception.

C Kirtley1, B J Andrews

  • 1Bioengineering Unit, University of Strathclyde, Glasgow, UK.

Journal of Biomedical Engineering
|May 1, 1990
PubMed
Summary

This study introduces extended physiological proprioception (EPP) to improve functional electrical stimulation (FES) for paraplegia. The novel EPP system enhances muscle response control and proprioceptive feedback, outperforming traditional methods.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Rehabilitation Technology

Background:

  • Functional electrical stimulation (FES) for paraplegia and tetraplegia is limited by variable muscle responses.
  • Existing position-servo controllers lack robustness against environmental changes or hardware faults.
  • Sensory feedback is crucial for safe and effective FES control.

Purpose of the Study:

  • To introduce and evaluate extended physiological proprioception (EPP) for FES control.
  • To compensate for muscle response variability in FES.
  • To provide proprioceptive feedback through natural sensory pathways.

Main Methods:

  • Developed an experimental system using EPP to control knee extension in a paraplegic subject via shoulder protraction.

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  • Utilized a Bowden cable with a dynamometer to generate control signals for a computer-controlled stimulator.
  • Applied surface stimulation to the quadriceps muscle group.
  • Performed modeling and parameter identification using step response analysis.
  • Designed the controller based on root locus analysis.

    • Main Results:

    • The EPP system demonstrated improved proprioceptive feedback.
    • Reduced limb-positioning errors were observed with the EPP system.
    • EPP outperformed both open-loop and closed-loop position-servo controllers in joint positioning accuracy tests with vision occluded.

    Conclusions:

    • Extended physiological proprioception (EPP) is a viable technique for enhancing FES control.
    • EPP offers improved sensory feedback and accuracy compared to conventional controllers.
    • This approach holds promise for safer and more effective FES applications in rehabilitation.