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Wearable Kinesthetic I/O Device for Sharing Wrist Joint Stiffness.

Jun Nishida, Keisuke Yagi, Modar Hassan

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 18, 2020
    PubMed
    Summary

    This study introduces a wearable system for sharing wrist joint stiffness during rehabilitation. It enables therapists and patients to interactively share muscle activity, improving rehabilitation outcomes.

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    Area of Science:

    • Rehabilitation Engineering
    • Human-Computer Interaction
    • Wearable Technology

    Background:

    • Physical rehabilitation often lacks objective measures for joint stiffness and muscle activity.
    • Sharing kinesthetic information between patients and therapists is challenging due to limited sensory feedback.
    • Current methods for assessing and intervening in muscle activity during rehabilitation can be invasive or provide incomplete data.

    Purpose of the Study:

    • To develop a wearable kinesthetic input-output (I/O) system for real-time sharing of wrist joint stiffness.
    • To enable interactive rehabilitation by enabling the sharing of muscle activities between patients and therapists.
    • To establish a quantifiable relationship between measured muscle activity and applied electrical muscle stimulation (EMS) for stiffness replication.

    Main Methods:

    • Developed a wearable system measuring and intervening in four forearm muscle activities via shared electrodes.
    • Utilized surface electromyography (sEMG) to measure muscle activity and EMS to apply controlled stiffness.
    • Conducted performance and perceptual studies to validate the system's ability to share wrist joint stiffness.

    Main Results:

    • Demonstrated a linear correlation between applied EMS and measured wrist joint stiffness.
    • Showed a linear correlation between produced wrist joint stiffness and measured EMG values.
    • Participants could accurately perceive and linearly rate their confederate's shared wrist joint stiffness.

    Conclusions:

    • The developed wearable kinesthetic I/O system effectively shares wrist joint stiffness and muscle activity.
    • The system establishes a reliable mapping between EMG signals and EMS for replicating joint stiffness.
    • This technology offers a novel approach for enhancing rehabilitation by providing shared sensory feedback for therapists and patients.