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Updated: Feb 13, 2026

Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis
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    Researchers developed a novel wrist-powered partial hand prosthesis, the JTP hand, featuring adaptive grasping and enhanced grip strength. This innovative design offers a potential solution for individuals with transmetacarpal amputations.

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    Area of Science:

    • Biomedical Engineering
    • Rehabilitation Engineering
    • Prosthetics and Orthotics

    Background:

    • Partial hand prostheses face challenges due to diverse presentations and component integration limitations.
    • Existing solutions often do not fully address the functional needs of partial hand amputees.

    Purpose of the Study:

    • To design, construct, and characterize a novel wrist-powered partial hand prosthesis (JTP hand).
    • To address the limitations of current partial hand prostheses through innovative mechanisms.
    • To customize the prosthesis for a specific patient with transmetacarpal amputation.

    Main Methods:

    • Development of a JTP hand incorporating a continuum whiffle tree mechanism for adaptive grasping.
    • Integration of a force-magnifying partial gear pair to augment grip strength.
    • Inclusion of a phalange-embedded disengageable ratchet for controlled backdrivability.
    • Experimental characterization and functional testing of grasps and gestures.

    Main Results:

    • The JTP hand successfully demonstrated various grasps and gestures.
    • The continuum whiffle tree mechanism facilitated adaptive grasping.
    • The force-magnifying gear pair enhanced grip power.
    • The disengageable ratchet provided adjustable backdrivability.

    Conclusions:

    • The designed JTP hand shows promise as a viable prosthetic option for transmetacarpal amputees.
    • The integrated mechanisms address key challenges in partial hand prosthesis design.
    • Further clinical evaluation is warranted to confirm efficacy in diverse patient populations.