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Related Experiment Videos

A voluntarily controlled electrohydraulic above-knee prosthesis.

W R Dyck, S Onyshko, D A Hobson

    Bulletin of Prosthetics Research
    |January 1, 1975
    PubMed
    Summary

    This study introduces a new prosthetic knee system offering above-knee amputees voluntary control over gait via EMG signals. This allows for a more natural, stable, and active walking experience.

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    Area of Science:

    • Biomedical Engineering
    • Rehabilitation Technology
    • Prosthetics

    Background:

    • Current above-knee prostheses offer limited user control over gait mechanics.
    • Existing systems often rely on constant friction or pre-programmed hydraulics, restricting natural movement and speed.
    • Lack of user control in conventional prosthetics impacts gait variability and stability.

    Purpose of the Study:

    • To develop and test a novel lower-limb prosthesis with voluntary user control.
    • To investigate the use of electromyography (EMG) signals for controlling prosthetic knee joint resistance.
    • To enhance gait dynamics, stability, and functional use for above-knee amputees.

    Main Methods:

    • Designed a hydraulic prosthetic knee system with solenoid valves.
    • Utilized EMG signals from residual thigh muscles to actuate the valves.
    • Developed a closed hydraulic loop system allowing variable resistance to knee flexion.
    • Tested the system's ability to control knee joint damping from free swing to full lock.

    Main Results:

    • Demonstrated the viability of an EMG-controlled hydraulic prosthetic knee system.
    • Amputees achieved voluntary control over knee flexion resistance, enabling variable gait.
    • The system provided improved stability on uneven terrain and allowed rising on the prosthesis.
    • The system allows for a more aesthetic and variable gait compared to conventional prostheses.

    Conclusions:

    • The EMG-controlled hydraulic prosthesis concept is proven feasible.
    • Further development is needed to optimize system weight, size, and cosmetic appearance.
    • This technology offers potential for more active and natural ambulation for amputees.

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