Design and Implementation of a blood pressure device with high sampling frequency to analyze cardiovascular diseases in LabVIEW

摘要

Considering the prevalence of hypertension in communities, the measurement of blood pressure is one of the most important parameters in the field of health. The first biomedical parameter taken from clients in health centers is blood pressure changes. With the advancement of technology in the field of medical engineering, analog blood pressure monitors have gradually been replaced by digital devices, such that the digital blood pressure monitors are used today. In this study, a system was designed and built that measures changes in blood pressure non-invasively and by an oscillometric method with high sampling frequency. In this research, first, the blood pressure hardware was designed and manufactured by instrumentation amplifier circuits to obtain the highest quality pressure signal. Then, in order to receive the signal and send digital data, the sampling frequency of one kHz was set in the microcontroller software to digitize the analog signal with high accuracy. Finally, the blood pressure signals were recorded with very low noise, and also systolic and diastolic pressures were calculated with appropriate quality in LabVIEW software. The performance of the device was tested on 20 subjects and the results were compared with valid digital sphygmomanometer. The number of heartbeats was also displayed according to the processing performed on the signal of changes in blood pressure. The system designed in this study provides the possibility of research on cardiovascular diseases by considering the record of the signal of high sampling frequency blood pressure changes and storing its data on the computer.