# Flexible Piezoelectric Sensor for Real-Time Comprehensive Cardiovascular Monitoring

## TL;DR

This paper introduces a flexible piezoelectric sensor system for real-time, wearable cardiovascular monitoring that captures multiple heart signals.

## Contribution

A self-contained, flexible biosensing platform integrating a piezoelectric sensor and custom PCB for on-body signal processing.

## Key findings

- The system captures radial, carotid, and seismocardiogram signals effectively.
- Thermal annealing improved the sensor's stable and linear performance.
- The PCB preserves high-impedance signals for reliable cardiovascular monitoring.

## Abstract

Wearable cardiovascular monitoring requires sensitive
sensors and
body-conforming electronics for reliable and automatic signal processing.
Here, we present a fully self-contained platform that integrates a
piezoelectric nanofibrous sensor with a custom flexible printed circuit
board (PCB) for on-body charge amplification and filtering. Fabricated
on a polyimide substrate with an ultralow bias current amplifier,
the PCB preserves high-impedance piezoelectric signals for on-body
signal processing. Electromechanical tests verified stable, linear
performance improved by thermal annealing. System-level evaluation
showed robust operation during cardiovascular monitoring, capturing
radial, carotid, and seismocardiogram signals and extracting key cardiac
parameters, demonstrating its potential as a practical, comprehensive,
and wearable biosensing solution.