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Shape Memory Ankle-Foot Orthoses.

Jianming Chen, Jinlian Hu, Aaron K L Leung

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    |September 18, 2018
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    Summary
    This summary is machine-generated.

    New shape memory ankle-foot orthoses (SM-AFOs) use textile composites for controlled ankle movement. These advanced orthotics offer stable, repeatable actuation for improved rehabilitation outcomes.

    Keywords:
    acrylic copolymersankle-foot orthosesdrop footelectrothermal fabricsshape memory

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    Area of Science:

    • Biomaterials Science
    • Orthotics and Prosthetics
    • Rehabilitation Engineering

    Background:

    • Conventional ankle-foot orthoses (AFOs) lack dynamic actuation capabilities.
    • Existing polymeric orthoses may have limitations in durability and responsiveness.
    • There is a need for advanced orthotic devices for effective ankle rehabilitation.

    Purpose of the Study:

    • To design and prototype electrically actuated ankle-foot orthoses (SM-AFOs) using shape memory textile composites.
    • To evaluate the shape memory properties, programming stability, and actuation performance of the developed SM-AFOs.
    • To explore the potential of SM-AFOs in clinical applications for ankle rehabilitation.

    Main Methods:

    • Synthesized acrylic copolymers to serve as the shape memory matrix.
    • Embedded electrothermal fabrics within the composite for uniform heat-triggered actuation.
    • Tested shape fixity, recovery, and programming cycles (at least 20 repetitions).
    • Evaluated actuation performance at 10 V for ankle angle correction.

    Main Results:

    • Achieved stable shape fixity and recovery over multiple programming cycles (>20).
    • Demonstrated effective electrical actuation of SM-AFOs at 10 V.
    • Successfully corrected ankle angles by 10° plantarflexion in clinical practice.
    • SM-AFOs exhibited superior performance compared to conventional polymeric orthoses.

    Conclusions:

    • Developed novel shape memory ankle-foot orthoses (SM-AFOs) with integrated electrothermal fabrics.
    • SM-AFOs offer reliable and repeatable actuation for therapeutic ankle angle correction.
    • This technology represents a promising advancement for smart orthopedic systems in progressive rehabilitation.