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Related Experiment Videos

An artificial grasping evaluation system for the paralysed hand.

M C de Castro1, A Cliquet Júnior

  • 1Department of Orthopaedics and Traumatology, Faculty of Medical Sciences, University of Campinas, Brazil.

Medical & Biological Engineering & Computing
|July 27, 2000
PubMed
Summary

Neuromuscular electrical stimulation (NMES) can restore hand function in quadriplegic individuals. Instrumented gloves quantify grasp patterns, showing NMES-generated forces are sufficient for object manipulation and rehabilitation assessment.

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Science
  • Neuroscience

Background:

  • Neuromuscular electrical stimulation (NMES) is a key technique in upper limb rehabilitation for motor function restoration.
  • Quantitative evaluation is crucial for optimizing muscle activation and assessing NMES effectiveness in hand function.
  • Previous studies highlight the need for precise measurement of artificially generated movements.

Purpose of the Study:

  • To quantitatively evaluate artificial grasping in quadriplegic individuals using NMES for a drinking activity.
  • To assess the force distribution and grasp patterns generated by NMES.
  • To determine the efficacy of instrumented gloves for feedback in NMES-controlled grasping.

Main Methods:

  • Custom-made gloves equipped with force and position transducers were utilized.

Related Experiment Videos

  • NMES was applied to simulate grasping actions for a drinking task.
  • Grasp patterns, force distribution among fingers, and force curves were analyzed.
  • Finger positions were measured via interphalangeal joint status to determine hand opening size.

    • Main Results:

    • NMES-induced grasp patterns mirrored those of unimpaired subjects in force distribution and curve shape.
    • The thumb exerted the largest force (2.8–4.5 N), followed by the index or long finger (1.8–3 N).
    • Generated forces were adequate to grasp a 10 N object, indicating functional capacity.
    • Instrumented gloves provided reliable force and position feedback for grasp evaluation.

    Conclusions:

    • NMES-generated grasping in quadriplegia exhibits similar patterns to natural grasping.
    • Instrumented gloves serve as a valuable tool for evaluating NMES-driven grasp function and rehabilitation progress.
    • The system supports closed-loop control for on-line adjustments and clinical assessment of rehabilitation outcomes.