Scientists have created a non-invasive, adhesive patch, which promises the measurement of glucose levels through the skin without a finger-prick blood test…
Scientists have created a non-invasive, adhesive patch, which promises the measurement of glucose levels through the skin without a finger-prick blood test, potentially removing the need for millions of diabetics to frequently carry out the painful and unpopular tests.
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The patch does not pierce the skin, instead, it draws glucose out from fluid between cells across hair follicles, which are individually accessed via an array of miniature sensors using a small electric current. The glucose collects in tiny reservoirs and is measured. Readings can be taken every 10 to 15 minutes over several hours.
The patch can be attached to the wrist to measure blood glucose without piercing the skin. University of Bath
Crucially, because of the design of the array of sensors and reservoirs, the patch does not require calibration with a blood sample — meaning that finger prick blood tests are unnecessary.
Having established proof of the concept behind the device, the research team from the University of Bath hopes that it can eventually become a low-cost, wearable sensor that sends regular, clinically relevant glucose measurements to the wearer’s phone or smartwatch wirelessly, alerting them when they may need to take action.
An important advantage of this device over others is that each miniature sensor of the array can operate on a small area over an individual hair follicle – this significantly reduces inter- and intra-skin variability in glucose extraction and increases the accuracy of the measurements taken such that calibration via a blood sample is not required.
Professor Richard Guy, from the Department of Pharmacy & Pharmacology, said: “A non-invasive – that is, needle-less – method to monitor blood sugar has proven a difficult goal to attain. The closest that has been achieved has required either at least a single-point calibration with a classic ‘finger-stick’ or the implantation of a pre-calibrated sensor via a single needle insertion. The monitor developed at Bath promises a truly calibration-free approach, an essential contribution in the fight to combat the ever-increasing global incidence of diabetes.”
Dr Adelina Ilie, from the Department of Physics, said: “The specific architecture of our array permits calibration-free operation, and it has the further benefit of allowing realisation with a variety of materials in combination. We utilised graphene as one of the components as it brings important advantages: specifically, it is strong, conductive, flexible, and potentially low-cost and environmentally friendly. In addition, our design can be implemented using high-throughput fabrication techniques like screen printing, which we hope will ultimately support a disposable, widely affordable device.”
In this study, the team tested the patch on both pigskin, where they showed it could accurately track glucose levels across the range seen in diabetic human patients, and on healthy human volunteers, where again the patch was able to track blood sugar variations throughout the day.
The next steps include further refinement of the design of the patch to optimise the number of sensors in the array, to demonstrate full functionality over a 24-hour wear period, and to undertake a number of key clinical trials.
An effective, non-invasive way of monitoring blood glucose could both help diabetics, as well as those at risk of developing diabetes, make the right choices to either manage the disease well or reduce their risk of developing the condition.
It’s interesting to know that an adhesive patch will offer bloodless diabetes monitoring at all times. My husband was recently told he should buy skin grip patches but I was unsure of what they really were for. I will pass this information to him to ensure that he buys them, and I will help him to find the right ones.
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It’s interesting to know that an adhesive patch will offer bloodless diabetes monitoring at all times. My husband was recently told he should buy skin grip patches but I was unsure of what they really were for. I will pass this information to him to ensure that he buys them, and I will help him to find the right ones.