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Related Experiment Videos

Artificial grasping system for the paralyzed hand.

M C Ferrari de Castro1, A Cliquet

  • 1Department of Orthopaedics and Traumatology, Faculty of Medical Sciences, State University of Campinas, Campinas, and Department of Electrical Engineering, Engineering School, University of São Paulo, São Carlos, São Paulo, Brazil.

Artificial Organs
|April 12, 2000
PubMed
Summary

Neuromuscular electrical stimulation (NMES) aids upper limb rehabilitation by restoring hand function. This study utilized a custom stimulator to enable prehension and grip, facilitating daily activities like eating and writing.

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Area of Science:

  • Rehabilitation engineering
  • Neuroprosthetics
  • Biomedical engineering

Background:

  • Upper limb motor dysfunction significantly impacts daily living.
  • Neuromuscular electrical stimulation (NMES) is a key technology in restoring hand function.
  • Existing NMES devices often lack the precision for complex grasp patterns.

Purpose of the Study:

  • To develop and evaluate a microcomputer-controlled NMES system for upper limb rehabilitation.
  • To enable functional grasp patterns for activities of daily living (ADLs).
  • To assess the efficacy of defined muscle activation sequences for prehension and power grips.

Main Methods:

  • An 8-channel microcomputer-controlled stimulator with monophasic square voltage output was employed.
  • Customized muscle activation sequences were programmed for palmar, lateral prehension, and power grip.

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  • Subjects performed tasks involving holding and releasing everyday objects.

    • Main Results:

    • The developed NMES system successfully facilitated functional grasp patterns.
    • Subjects demonstrated the ability to perform tasks such as drinking, eating, writing, and typing.
    • The system's muscle activation sequences were effective in restoring voluntary-like hand movements.

    Conclusions:

    • Microcomputer-controlled NMES is a viable approach for upper limb rehabilitation.
    • Functional restoration of hand motor function can be achieved through targeted NMES.
    • This technology holds promise for enhancing independence in ADLs for individuals with motor impairments.