Abstract
The paper presents two methods of determining calibration curve of a new device for blood pressure measurement. The device was developed at Wrocław University of Science and Technology. First method is based on parallel measurement of systolic and diastolic pressure measurement with use of reference device such as sphygmomanometer and researched new device with pneumatic sensor equipped with voltage type output. Obtained data (systolic ps and diastolic pd pressure, maximum us and minimum ud voltage) was then used to determine individual pressure-voltage characteristic of the device, which can be represented as a linear equation. Second method is based on substitution of experimentally proved coefficient b with its analytical equivalent extracted from mathematical model of described pneumatic sensor. Described methods were verified experimentally and compared. Metrological parameters of the device were designated.
Highlights
Blood pressure measurement is a basic element of medical examination
The developed device for measurement and registration of blood pressure waveform, despite the excellent measuring parameters exhibited during evaluation in laboratory conditions, did not give accurate results during tests on volunteers
The attempt of preliminary improvement of the device’s accuracy was taken with use of two calibration methods – standard method 1 based on mean linear equation’s coefficients and the modification of standard method 2 with one of the coefficients corrected based on mathematical model of the device
Summary
Blood pressure measurement is a basic element of medical examination. Depending on the case different method is used. Different oscillometric devices use various algorithms and calibration coefficients which leads to differing blood pressure readings [3] This method is not considered very accurate, it is popular for domestic uses [4]. A new measurement method with use of the newly developed device allows to examine the blood pressure waveform [5], which can be a source of important data for general practice and clinical diagnosis. Due to the lack of non-invasive accurate method for pressure measurement and blood pressure waveform recording, the new device was developed. Designed application selects the waveform with highest amplitude which designates systolic and diastolic pressure and displays all accessible parameters associated with cardiovascular condition of a patient
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