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    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
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    Summary

    This study introduces a novel wireless, implantable pressure sensor for monitoring blood vessels. The flexible device uses magnetic resonance imaging (MRI) for readout, overcoming challenges of traditional wired sensors.

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    Area of Science:

    • Biomedical Engineering
    • Medical Devices
    • Sensor Technology

    Background:

    • Postoperative monitoring of aneurysms requires accurate local blood vessel pressure measurement.
    • Conventional pressure sensors present challenges, including operative difficulties and infection risks due to implanted cables.
    • A need exists for minimally invasive, wireless pressure monitoring solutions.

    Purpose of the Study:

    • To develop and demonstrate a wireless, implantable, and flexible pressure sensor for blood vessel monitoring.
    • To utilize magnetic resonance imaging (MRI) for non-invasive sensor readout.
    • To provide a safer and more convenient alternative to conventional cabled pressure sensors.

    Main Methods:

    • Designed a wireless sensor based on an LC resonant circuit with a spiral coil and a pressure-sensitive capacitor.
    • Fabricated a prototype using a silicone elastomer dielectric and a gold spiral coil.
    • Utilized MRI to detect signal variations caused by pressure-induced capacitance changes.

    Main Results:

    • The prototype sensor demonstrated a maximum capacitance change of 8% under 20 kPa external pressure.
    • Pressure-induced changes in dielectric elastomer thickness altered capacitance, leading to detectable MRI signal variations.
    • The wireless, flexible sensor successfully transmitted pressure-related data via MRI.

    Conclusions:

    • The developed wireless implantable pressure sensor offers a promising solution for postoperative aneurysm monitoring.
    • MRI-based readout eliminates the need for cables, reducing surgical complications and infection risk.
    • This technology advances minimally invasive diagnostic tools for vascular applications.