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    Breaking News

    Microneedle Patch Glucose Monitor Proves Virtually Painless and More Accurate

    The completion of a system for clinical tests is now underway.

    Microneedle Patch Glucose Monitor Proves Virtually Painless and More Accurate
    The microneedle is significantly smaller than the commercial standard for continuous glucose monitoring. Image courtesy of KTH.
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    • Painless Paper Patch Glucose Level Test Uses Microneedles
    KTH The Royal Institute of Technology01.03.19
    A more comfortable and reliable blood-sugar monitoring system is being designed by researchers in Sweden for people with diabetes. After successfully testing a prototype of a microneedle patch on a human subject, the completion of a system for clinical tests is now underway.
     
    Continuous monitoring is a way to safely and reliably lower blood glucose—giving the user a full picture of their glucose levels throughout the day and helping them avoid severe hypoglycemia. But the continuous glucose monitoring systems (known as CGMS) in use today have two main drawbacks: they are uncomfortable since they require a minimum 7mm needle that’s inserted into the skin; and, because of their size, they take measurements in the fat tissue—not the most ideal location.
     
    Researchers at KTH Royal Institute of Technology in Stockholm have developed a promising alternative: a microneedle patch that is 50 times smaller than the needles used in today’s CGM systems. The combination of the patch and an extremely miniaturized three-electrode enzymatic sensor was shown in a recent study to be capable of correctly and dynamically tracking blood glucose levels over time, with a delay of about 10 minutes, when applied to a human subject’s forearm.
     
    One of the researchers, doctoral student Federico Ribet, said the next steps are to develop a transferable adhesive patch, along with algorithms and embedded electronics for a fully-realized system to take to clinical trial.
     
    "Our solution is painless to the user,” Ribet said. “We measure directly in the skin, and there are no nerve receptors that detect pain—just a fine mesh of very tiny blood vessels.”
     
    Within the dermis, the hollow microneedles rely on natural capillary action to fill up with interstitial fluid, the liquid surrounding the cells in the skin. Nutrients like sugar, diffuse out of the blood capillaries in this fluid to reach the cells.
     
    “An important distinction is that unlike commercially available CGMS which measure the subcutaneous fat tissue, ours measures within the skin less than 1mm deep, where the interstitial fluid follows closer and more homogeneously the blood-glucose oscillations,” Ribet said.
     
    This would offer an alternative to pricking one’s fingers several times a day to take a blood test, although a user would still occasionally have to do so—as they do with commercial CGMS—in order to recalibrate the sensor and get the most accurate and immediate readings.
     
    But with this new system, that could one day change. Ribet pointed out that the most advanced CGM device now on the market is factory calibrated and reduces the frequency of having to conduct a finger blood test. He said the research team at KTH believes it could ultimately match, or even surpass this level of quality.
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    • Chronic Disease | Patient Monitoring
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      Painless Paper Patch Glucose Level Test Uses Microneedles

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