A new biomarker-monitoring patch (IMAGE)
Caption
Researchers have developed a microneedle patch to monitor a range of health biomarkers without drawing blood or relying on batteries or external devices. The patch consists of four layers: a polymer “housing” – which is effectively the part of the patch you can see; a layer of gel; a layer of paper; and the microneedles themselves. The microneedles are made of a material that swells when it touches the ISF. The ISF wicks through the microneedle – like water through a paper towel – until it comes into contact with the paper. As the paper begins absorbing the ISF, the fluid comes into contact with the gel that is on the other side of the paper. That gel contains a high concentration of glycerol. The imbalance of glycerol between the gel and the ISF creates osmotic pressure that pulls more ISF through the paper until the paper is saturated.
Credit
Michael Daniele, NC State University
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