A composite sensing cuff integrating a PVDF module acquired oscillometric signals with high similarity to traditional cuffs but higher response sensitivity to the AC component.
Does a composite sensing cuff with PVDF sensing improve the accuracy of oscillography blood pressure measurement?
A novel composite sensing cuff utilizing PVDF piezoelectric sensing improves the extraction of oscillometric signals, enabling more accurate and personalized blood pressure estimation.
Objective: This work focuses on development a composite sensing cuff by introducing PVDF sensing module to improve the quality of oscillating signals, which aims at establishing personalized parameter estimation and blood pressure measurement methods.Design and method: Oscillography is widely used in general populations, but its fixed-ratio method shows significant deviations in obese individuals, those with hypertension abnormalities, and populations with special physiological conditions. This study establishes a comprehensive physical framework for the oscillometric measurement process, encompassing an arterial compliance model, a vessel-cuff volume coupling model, a cuff pressure-volume model, and a cuff inflation/deflation model. Building on this framework, a personalized systolic/diastolic pressure calibration method is proposed, which is presented in fig.1. The composite sensing cuff integrates PVDF piezoelectric sensing and US9111 air pressure sensing. The PVDF equivalent circuit model and amplification circuit were simulated to design corresponding sensing circuits. Simultaneously, aluminum foil and electrical tape were wrapped around the sensor signal lines to achieve electromagnetic shielding (fig.2). To extract cuff information from data acquired by the composite sensing cuff, this work employs a series of processing steps including automatic localization of the deflation segment, wavelet transform (db5) for DC baseline separation, the AMPD algorithm for peak-valley extraction, and smooth curve fitting for envelope generation(fig.3). This produces sample sequences for personalized blood pressure fitting. Results: Experiments have proved the effectiveness of the scheme. Conclusions: The PVDF oscillometric signals acquired by the composite sensing cuff exhibit high similarity to traditional cuff pressure oscillometric signals, with PVDF showing higher response sensitivity to the AC component. The signal processing procedure can stably extract the DC baseline and accurate oscillometric envelope. The personalized model outputs systolic and diastolic pressure estimates based on subject characteristics.
Xu et al. (Fri,) conducted a other in Blood pressure measurement. Composite sensing cuff with PVDF sensing module vs. Traditional cuff pressure oscillometric signals was evaluated on Quality of oscillating signals and personalized parameter estimation. A composite sensing cuff integrating a PVDF module acquired oscillometric signals with high similarity to traditional cuffs but higher response sensitivity to the AC component.