An Easy Approach to Develop a Digital Blood Pressure Meter

Korotkoff method is the most used method for blood pressure measurement. In this method, sphygmomanometer and a stethoscope are required. A trained person is required for properly measuring blood pressure. In this paper, an easy approach has been introduced to develop a non-invasive digital blood pressure meter that will enable people to measure their blood pressure at home without the help of a trained person. This design consists of a simple circuit. The pressure signal is collected by a pressure sensor, which consists of the valuable signal for blood pressure measurement along with many noise signals. So, it is processed by using a two-stage bandpass filter and an analog to digital converter. The signal obtained after filtering is suitable for calculating systolic and diastolic blood pressure values using simple software design. Then calculated values of systolic and diastolic blood pressure can be shown on a liquid crystal display. In this system, no digital filtering is required. Therefore, this system is easy to implement and by using this system, it is possible to convert an analog sphygmomanometer into a digital blood pressure monitor easily. As this system provides an opportunity for measuring blood pressure at home without a trained person, it will be very helpful for early diagnosing of problems related to blood pressure.