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A Wireless Miniature Injectable Device With Memory-Assisted Backscatter for Multimodal Animal Physiological

Yiming Han, Raymond G Stephany, Linran Zhao

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    This study presents a wirelessly powered integrated circuit for monitoring animal body temperature, ECG, and PPG. The device uses a novel coil design and memory-assisted backscatter for reliable, long-term data transmission in injectable sensors.

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    Area of Science:

    • Biomedical Engineering
    • Implantable Devices
    • Wireless Sensor Networks

    Background:

    • Accurate physiological monitoring in animals is crucial for research.
    • Existing methods often require invasive procedures or tethered equipment.
    • Miniaturized, wirelessly powered sensors offer a less intrusive alternative.

    Purpose of the Study:

    • To develop a wirelessly powered, multimodal animal physiological monitoring ASIC.
    • To enable continuous subcutaneous monitoring of body temperature, ECG, and PPG.
    • To achieve miniaturization and reliable data transmission for injectable devices.

    Main Methods:

    • Fabrication of an 180 nm ASIC with a miniature receiver coil for wireless power and data.
    • Implementation of a folded L-shape Rx coil for improved coupling and quality factor.
    • Utilizing a memory-assisted backscatter scheme for reliable data transmission and storage.

    Main Results:

    • The ASIC consumes 2.55 µW average power and integrates temperature, ECG, and PPG sensors.
    • Achieved 0.02 °C inaccuracy for temperature sensing (27-47 °C).
    • Demonstrated a package loss rate (PLR) < 0.2% with 24-hour data storage.

    Conclusions:

    • The developed ASIC enables efficient, wireless, multimodal physiological monitoring in animals.
    • The novel coil and backscatter scheme enhance data reliability and device longevity.
    • In vivo experiments validated the functionality of the injectable monitoring system.