Jorge Silva, MASc, Winfried Heim, CP(c), Tom Chau, PhD, PEng

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Presentation transcript:

A Self-Contained, Mechanomyography-Driven Externally Powered Prosthesis Jorge Silva, MASc, Winfried Heim, CP(c), Tom Chau, PhD, PEng Archives of Physical Medicine and Rehabilitation Volume 86, Issue 10, Pages 2066-2070 (October 2005) DOI: 10.1016/j.apmr.2005.03.034 Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 1 Hardware components of the MMG-driven prosthesis arm. The MMG socket (bottom left) contains the 3 CMASPs used to record sounds from contracting muscles. The electromyographic emulator board (bottom right) generates sound-based estimates of electric muscle activity. Archives of Physical Medicine and Rehabilitation 2005 86, 2066-2070DOI: (10.1016/j.apmr.2005.03.034) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 2 The CMASP.6 (A) top view (accelerometer’s side), (B) bottom view (microphone’s side), (C) schematic diagram, and (D) bottom view after encasing (an additional membrane is later added to seal the air chamber). Archives of Physical Medicine and Rehabilitation 2005 86, 2066-2070DOI: (10.1016/j.apmr.2005.03.034) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 3 Schematic diagram of the software modules programmed in the electromyographic (EMG) emulator board. MMG-based estimates of electric muscle activity are obtained for the wrist flexors (EMGf′) and extensors (EMGe′). These signals are then fed to the conventional prosthesis hand hardware. Abbreviation: RMS, root mean square. Archives of Physical Medicine and Rehabilitation 2005 86, 2066-2070DOI: (10.1016/j.apmr.2005.03.034) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 4 Comparison of measured (gray trace) and estimated (black trace) electric muscle activity signals. Measured electromyographic signals were obtained with conventional Otto Bock electromyography electrodes. Estimated signals were obtained from raw MMG signals acquired with the CMASPs within the MMG socket, and processed by the proposed emulation algorithms. Archives of Physical Medicine and Rehabilitation 2005 86, 2066-2070DOI: (10.1016/j.apmr.2005.03.034) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions