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A Chair-Based Unconstrained/Nonintrusive Cuffless Blood Pressure Monitoring System Using a Two-Channel Ballistocardiogram

Deepmedi Research Institute of Technology, Deepmedi Inc., Seoul 06232, Korea
Human Convergence Technology Group, Korea Institute of Industrial Technology (KITECH), 143 Hanggaulro, Ansan 15588, Korea
Author to whom correspondence should be addressed.
Sensors 2019, 19(3), 595;
Received: 21 December 2018 / Revised: 29 January 2019 / Accepted: 29 January 2019 / Published: 31 January 2019
(This article belongs to the Special Issue Sensors for Biopotential, Physiological and Biomedical Monitoring)
PDF [2787 KB, uploaded 31 January 2019]


Hypertension is a well-known chronic disease that causes complications such as cardiovascular diseases or stroke, and thus needs to be continuously managed by using a simple system for measuring blood pressure. The existing method for measuring blood pressure uses a wrapping cuff, which makes measuring difficult for patients. To address this problem, cuffless blood pressure measurement methods that detect the peak pressure via signals measured using photoplethysmogram (PPG) and electrocardiogram (ECG) sensors and use it to calculate the pulse transit time (PTT) or pulse wave velocity (PWV) have been studied. However, a drawback of these methods is that a user must be able to recognize and establish contact with the sensor. Furthermore, the peak of the PPG or ECG cannot be detected if the signal quality drops, leading to a decrease in accuracy. In this study, a chair-type system that can monitor blood pressure using polyvinylidene fluoride (PVDF) films in a nonintrusive manner to users was developed. The proposed method also uses instantaneous phase difference (IPD) instead of PTT as the feature value for estimating blood pressure. Experiments were conducted using a blood pressure estimation model created via an artificial neural network (ANN), which showed that IPD could estimate more accurate readings of blood pressure compared to PTT, thus demonstrating the possibility of a nonintrusive blood pressure monitoring system. View Full-Text
Keywords: cuffless blood pressure monitoring system; hypertension; photoplethysmogram cuffless blood pressure monitoring system; hypertension; photoplethysmogram

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Lee, K.J.; Roh, J.; Cho, D.; Hyeong, J.; Kim, S. A Chair-Based Unconstrained/Nonintrusive Cuffless Blood Pressure Monitoring System Using a Two-Channel Ballistocardiogram. Sensors 2019, 19, 595.

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