Tonometer Clock: Continuous Monitoring

Health problems accompanied by an increase in blood pressure (hypertension) belong to a number of the most common causes of mortality in the world. However, not every hypertension suffering regularly measures blood pressure, not to mention constant monitoring. Such a monitoring is a rather tedious procedure for the patient: the automatic tonometer cuff dresses on the hand, which is activated at certain time intervals (usually 15 minutes), inflates and compresses the hand to read. In some cases, an invasive method is used: a catheter is inserted into the artery pressure to measure. It is not surprising that patients are not delighted with these manipulations and try to avoid them, as long as it is possible. However, the method proposed by STBL must provide the possibility of non-invasive blood pressure monitoring, pulse and blood flow velocity with a convenient, compact device that can be worn like a clock.

The main difficulty in creating such an appliance is the dependence of the sensor readings not only from blood pressure, but also on the nature of the contact of this sensor with the skin. Muscle voltage, bracelet gliding up-down hand, sharp movements – all this can create "interference", significantly affecting the result. Developers solve this problem with a number of correctional measurements, the data of which are processed by special software, calculating the corrections to determine the true value of blood pressure. For additional measurements, piezoresistive fibers developed in EMPA (Swiss federal laboratory of materials science and technology) are used. They provide high sensitivity of pressure and displacement sensors and allow you to significantly improve measurement accuracy.

Tonometer clock continuous monitoring

Prototypes of "Wrist Tonometers" showed quite good results during testing in parallel with invasive pressure monitoring. According to developer forecasts, such portable devices will cost an order of magnitude cheaper of existing medical facilities for permanent pressure control. It is planned to create two versions: one for professional use by medical workers, and the second, simpler – for athletes and other people who follow their health.

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