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Stable Wireless Power Transfer Using a Novel Omnidirectional Receiver and a Flexible Transmitter for Capsule Robots.

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    Wireless power transfer enables continuous charging for capsule endoscopes. A wearable 3D coil system adapts to capsule movement, ensuring efficient and safe power delivery for improved gastrointestinal diagnostics.

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    Area of Science:

    • Biomedical Engineering
    • Medical Devices
    • Wireless Power Transfer

    Background:

    • Capsule endoscopy offers non-invasive gastrointestinal diagnostics but faces power limitations due to high-definition video and advanced features.
    • Compact capsule size restricts battery capacity, hindering prolonged operation and data acquisition.
    • Wireless Power Transfer (WPT) presents a viable solution to address the energy bottleneck in capsule robots.

    Purpose of the Study:

    • To develop a wearable wireless power transfer system for omnidirectional and uninterrupted charging of capsule robots.
    • To enhance the efficiency and safety of power delivery for ingestible biomedical devices.
    • To investigate practical challenges and ensure robust performance in real-world scenarios.

    Main Methods:

    • A wearable three-dimensional transmitting coil (3DTC) and a one-dimensional receiving coil (1DRC) were designed for capsule robots.
    • Adaptive control of the 3DTC's magnetic field based on capsule attitude data to maximize receiving efficiency.
    • Integration of thermal and charging management circuits within the capsule for safety monitoring.

    Main Results:

    • Achieved a maximum received power of 1690 mW and a peak efficiency of 16.09%.
    • Demonstrated adaptive magnetic field control for efficient charging despite capsule movement and orientation changes.
    • Evaluated charging robustness, coil bending effects in garments, and thermal safety under various conditions.

    Conclusions:

    • The developed wearable WPT system enables safer, more efficient, and sustainable capsule robot operation.
    • Adaptive control and integrated safety circuits are crucial for reliable wireless charging of ingestible devices.
    • This technology addresses key limitations, paving the way for advanced gastrointestinal diagnostic tools.