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A wireless device for measuring hand-applied forces.

William Tam1, Robert Allen, Y S G Hoe

  • 1Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|February 3, 2007
PubMed
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This study introduces a wireless system using electromyography (EMG) to measure hand forces accurately. The non-invasive device offers potential for rehabilitation and training applications.

Area of Science:

  • Biomedical Engineering
  • Rehabilitation Technology
  • Wearable Sensors

Background:

  • Measuring hand-applied forces is crucial for rehabilitation and training.
  • Existing methods can be intrusive or lack real-time feedback.
  • Electromyography (EMG) signals reflect muscle activity related to force generation.

Purpose of the Study:

  • To develop and validate a wireless EMG-based system for quantifying hand-applied forces.
  • To assess the system's accuracy, linearity, and repeatability.
  • To explore its potential clinical applications.

Main Methods:

  • A portable surface EMG device captures forearm muscle biopotentials.
  • Radio frequency (RF) transmission wirelessly sends data to a data acquisition system.

Related Experiment Videos

  • Individual calibration relates EMG signals to specific force outputs (pulling, clenching).

    • Main Results:

    • Calibration curves demonstrated high linearity (R(2) > 0.9) and repeatability (<10% slope variation).
    • The system accurately measured forces up to 110 Newtons (N).
    • Wireless data transmission was effective up to 20 meters.

    Conclusions:

    • The wireless EMG system provides an unobtrusive and accurate method for measuring hand forces.
    • This technology shows promise for applications in physical rehabilitation and skill training.
    • Further clinical validation, such as in newborn delivery assistance, is warranted.