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Related Experiment Videos

A self-contained, mechanomyography-driven externally powered prosthesis.

Jorge Silva1, Winfried Heim, Tom Chau

  • 1Pediatric Rehabilitation Intelligent Systems Multidisciplinary Laboratory, Bloorview MacMillan Children's Centre, Toronto, ON, Canada. jorge.silva@utoronto.ca

Archives of Physical Medicine and Rehabilitation
|October 11, 2005
PubMed
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Mechanomyography (MMG) signals enable intuitive control for prosthetic limbs. This study demonstrated a self-contained MMG-driven prosthesis with successful hand open/close functions in unconstrained environments.

Area of Science:

  • Biomedical Engineering
  • Rehabilitation Technology
  • Biomechanics

Background:

  • Mechanomyography (MMG) measures low-frequency muscle vibrations (5-50 Hz).
  • MMG offers advantages over myoelectric control for prostheses: non-specific sensor placement, distal measurement, impedance robustness, and lower cost.
  • Existing MMG-driven prostheses often require complex setups and are limited to controlled environments.

Purpose of the Study:

  • To demonstrate a two-function prosthesis controlled by MMG signals.
  • To develop a self-contained, practical MMG-driven prosthesis for below-elbow amputees.
  • To identify research needs for clinical implementation of MMG in upper-limb prostheses.

Main Methods:

  • Designed and implemented a novel, self-contained MMG-driven prosthesis with specialized hardware and software.

Related Experiment Videos

  • Emulated a two-site electromyography sensing system using MMG signals.
  • Tested the prosthesis on two below-elbow amputee subjects in unconstrained environments.

    • Main Results:

    • Achieved voluntary open and close control of the prosthesis hand with minimal delay (approx. 120 ms).
    • Demonstrated successful MMG control within a self-contained unit in unconstrained settings.
    • Attained control accuracies of 88% and 71% for the two subjects.

    Conclusions:

    • MMG signals can effectively control a self-contained, externally powered prosthesis in real-world conditions.
    • Standardized sensor attachment, noise reduction, and system miniaturization are feasible for practical MMG prosthesis use.
    • Further research is needed for full clinical integration of MMG control in upper-limb prosthetics.