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New York, June 4 US engineers have developed a simple, low-cost clip that uses a smartphone's camera and flash to monitor blood pressure at the user's fingertip.The clip, developed by a team at the University of California San Diego, works with a custom smartphone app and currently costs about 80 cents to make. The researchers estimate that the cost could be as low as 10 cents apiece when manufactured at scale.The technology, published in the journal Scientific Reports, can help make regular blood pressure monitoring easy, affordable, and accessible to people in resource-poor communities. It could benefit older adults and pregnant women, for example, in managing conditions such as hypertension."Because of their low cost, these clips could be handed out to anyone who needs them but cannot go to a clinic regularly," said Edward Wang, Professor of electrical and computer engineering at UC San Diego."A blood pressure monitoring clip could be given to you at your checkup, much like how you get a pack of floss and toothbrush at your dental visit," he addedTo measure blood pressure, the user simply presses on the clip with a fingertip. A custom smartphone app guides the user on how hard and long to press during the measurement.The clip is a 3D-printed plastic attachment that fits over a smartphone's camera and flash. It features an optical design similar to that of a pinhole camera. When the user presses on the clip, the smartphone's flash lights up the fingertip. That light is then projected through a pinhole-sized channel to the camera as an image of a red circle.A spring inside the clip allows the user to press with different levels of force. The harder the user presses, the bigger the red circle appears on the camera.The smartphone app extracts two main pieces of information from the red circle. By looking at the size of the circle, the app can measure the amount of pressure that the user's fingertip applies.And by looking at the brightness of the circle, the app can measure the volume of blood going in and out of the fingertip. An algorithm converts this information into systolic and diastolic blood pressure readings.Disclaimer: This post has been auto-published from an agency feed without any modifications to the text and has not been reviewed by an editor

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