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- Title
Sphygmomanometer Dynamic Pressure Measurement Using a Condenser Microphone.
- Authors
Tomazini, Žan; Geršak, Gregor; Beguš, Samo
- Abstract
There is a worldwide need to improve blood pressure (BP) measurement error in order to correctly diagnose hypertension. Cardiovascular diseases cause 17.9 million deaths annually and are a substantial monetary strain on healthcare. The current measurement uncertainty of 3 mmHg should be improved upon. Dynamic pressure measurement standards are lacking or non-existing. In this study we propose a novel method of measuring air pressure inside the sphygmomanometer tubing during BP measurement using a condenser microphone. We designed, built, and tested a system that uses a radiofrequency (RF) modulation method to convert changes in capacitance of a condenser microphone into pressure signals. We tested the RF microphone with a low-frequency (LF) sound source, BP simulator and using a piezoresistive pressure sensor as a reference. Necessary tests were conducted to assess the uncertainty budget of the system. The RF microphone prototype has a working frequency range from 0.5 Hz to 280 Hz in the pressure range from 0 to 300 mmHg. The total expanded uncertainty (k = 2, p = 95.5%) of the RF microphone was 4.32 mmHg. The proposed method could establish traceability of BP measuring devices to acoustic standards described in IEC 61094-2 and could also be used in forming dynamic BP standards.
- Subjects
DYNAMIC pressure; SPHYGMOMANOMETERS; PRESSURE measurement; BLOOD pressure testing machines; MICROPHONES; MEASUREMENT errors; AIR pressure
- Publication
Sensors (14248220), 2023, Vol 23, Issue 19, p8340
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s23198340