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A Novel Non-Invasive Intervention for Removing Occlusions From Shunts Using an Abrading Magnetic Microswarm.

Abbas Moghanizadeh, Hesam Khaksar, Ali Kafash Hoshiar

    IEEE Transactions on Bio-Medical Engineering
    |July 21, 2022
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    Summary

    This study presents a new, non-invasive method using magnetic nanoparticles (MNPs) to clear shunt calcifications. This approach minimizes invasive surgeries and complications associated with shunt failure.

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    Area of Science:

    • Biomedical Engineering
    • Nanotechnology
    • Medical Device Development

    Background:

    • Shunts are vital medical devices for fluid drainage but are prone to calcification, leading to failure and requiring invasive replacement surgeries.
    • Current shunt replacement procedures are invasive, increasing patient risk and healthcare costs.

    Purpose of the Study:

    • To introduce and validate a novel, non-invasive method for removing calcifications from shunt walls.
    • To demonstrate the efficacy of magnetic nanoparticles (MNPs) guided by an external magnetic field for shunt deposit removal.

    Main Methods:

    • A prototype device was developed to guide a swarm of magnetic nanoparticles (MNPs) within shunts containing calcification layers.
    • Proof-of-concept experiments utilized a moving magnetic field (0.1–0.3 T, 1–12 cm/s) to abrade deposits using 45 nm MNPs.
    • Five contact theories were applied to predict wear and indentation, with the Hoeprich model showing the best agreement with experimental results.

    Main Results:

    • Experimental results confirmed that MNPs effectively abrade shunt calcification deposits under a moving magnetic field.
    • A direct correlation was observed between magnetic field intensity, magnet velocity, and the rate of calcification removal.
    • The Hoeprich model demonstrated a deviation of only 12.1% from experimental findings, indicating its suitability for predicting wear.

    Conclusions:

    • This research introduces a groundbreaking, minimally invasive technique for shunt deposit removal.
    • The developed MNP-based method has the potential to significantly reduce the need for revision surgeries and associated complications.
    • This innovative approach offers a promising alternative to traditional invasive procedures for shunt maintenance.