Accurate blood pressure measurement can now be cuff-less & calibration-free – and built into every smartphone
27 November 2019
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“Cuff-less” devices that require cuff calibration or wearables that are not medically accurate will not solve the global hypertension epidemic – but new sensor technology from LMD can help overcome this problem.
The first measurement of blood pressure was made in 1896, by squeezing the flesh around an artery. This method remains the only non-invasive way to measure blood pressure, and 123 years later, there is only one device in the world that can do it without a cuff and to medical accuracy. That device, the V-Sensor, is the technical implementation of proven medical science by Leman Micro Devices (LMD), a developer of regulated consumer healthcare products that is backed by major players within the mobile device industry.
There are many ways of tracking changes in blood pressure and a plethora of wearable and non-wearable devices now on the market that do it. These devices are not cuff-less; they require the input of cuff-measured blood pressure and then monitor changes over the next few days. Then a new calibration is necessary, using a cuff again. That doesn’t help the one billion plus people in the world at risk of dying from hypertension, because they do not know they have it – once they have used a cuff to calibrate a device, they will know that they’re ill and don’t need the device. Other wearable devices are simply not medically accurate, which is even worse.
LMD’s unique and patented solution uses the same principle as a cuff, but acts on the fingertip. Its V-Sensor module instructs the user to press harder or softer to occlude the arteries of the tip of the index finger, and detects it optically using a pulse oximeter. The V-Sensor is small enough and cheap enough to be built into every mobile phone and is fully engineered for production in smartphone quantities.
Its accuracy for both Systolic and Diastolic blood pressure measurement complies with international standard ISO 81060-2: mean error < 5 mmHg and standard deviation < 8 mmHg. With no personal calibration, V-Sensor has demonstrated accuracy for systolic blood pressure (SBP) of mean error -0.4 mmHg, standard deviation 7.2 mmHg, and for diastolic blood pressure (DBP) of mean error -0.2 mmHg, standard deviation 6.0 mmHg, both well within the deviation allowed by the ISO standard.
Mark-Eric Jones, LMD CEO comments: “By creating our unique technical solution – the V-Sensor – in a device that can be built into every smartphone, as well as wearables, we bring massive health benefits, because we give users medically-accurate blood pressure measurement that is truly cuff-less and calibration-free. V-Sensor with our e-Checkup software will save lives.”
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