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

Area of Science:

• Biomedical Engineering
• Cardiovascular Health
• Sensor Technology

Background:

• Hypertension management requires continuous blood pressure monitoring.
• Existing cuff-based methods are cumbersome for patients.
• Current cuffless methods (e.g., PPG, ECG) require direct user contact and can suffer from signal degradation, impacting accuracy.

Purpose of the Study:

• To develop a non-intrusive, chair-type system for continuous blood pressure monitoring.
• To evaluate the efficacy of instantaneous phase difference (IPD) as a feature for blood pressure estimation.
• To compare the accuracy of IPD with pulse transit time (PTT) in a novel system.

Main Methods:

• Development of a chair-type system incorporating polyvinylidene fluoride (PVDF) films for non-intrusive sensing.
• Utilizing instantaneous phase difference (IPD) derived from sensor signals as the primary feature for blood pressure estimation.
• Employing an artificial neural network (ANN) model for blood pressure estimation based on IPD values.

Main Results:

• The developed chair-type system successfully monitored blood pressure non-intrusively.
• Instantaneous phase difference (IPD) demonstrated higher accuracy in blood pressure estimation compared to pulse transit time (PTT).
• The artificial neural network (ANN) model effectively utilized IPD for blood pressure prediction.

Conclusions:

• The proposed chair-type system offers a viable non-intrusive approach to blood pressure monitoring.
• IPD is a more robust feature than PTT for accurate blood pressure estimation in this context.
• This technology holds promise for improved hypertension management and patient compliance.