Piezoelectric Sensor Extracting Cardiac Features From Respiration Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for monitoring cardiac and respiratory activity are invasive, cumbersome, and restrict subject movement, requiring bulky equipment and multiple probes, limiting their use for continuous, real-time monitoring.
Innovation Solution
A method using at least one piezoelectric sensor to capture mechanical movements related to breathing and cardiac activity, processing these signals to extract cardiac parameters without the need for traditional equipment, allowing for continuous, non-invasive monitoring and movement freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional monitoring equipment (ECG, PPGG sensors) is used to obtain reliable cardiac measurements, then measurement precision is improved, but device complexity and ease of operation deteriorate due to the need for multiple probes and bulky equipment
Solution Approach 1:
The patent combines multiple monitoring functions (cardiac activity detection, respiration monitoring, and movement tracking) into a single piezoelectric sensor system. The sensor simultaneously captures mechanical vibrations from the heart, respiratory movements, and body motion, eliminating the need for separate ECG electrodes, PPGG sensors, and movement detectors that would otherwise be required.
Solution Approach 2:
The piezoelectric sensor serves multiple functions: it detects cardiac mechanical vibrations through its piezoelectric effect, monitors respiration through chest wall movement, and tracks body motion. This multi-functional approach replaces traditional specialized sensors for each parameter, reducing overall system complexity while maintaining measurement capabilities.
2Measurement precision
If multiple probes are installed to ensure reliable measurements, then measurement precision is improved, but ease of operation deteriorates due to time-consuming installation and subject restriction
Solution Approach 1:
The patent combines multiple monitoring functions (cardiac activity detection, respiration monitoring, and movement tracking) into a single piezoelectric sensor system. The sensor simultaneously captures mechanical vibrations from the heart, respiratory movements, and body motion, eliminating the need for separate ECG electrodes, PPGG sensors, and movement detectors that would otherwise be required.
Solution Approach 2:
The system automatically separates and identifies cardiac signals from respiration and motion artifacts using signal processing algorithms. The processor autonomously analyzes the composite signal, extracts cardiac features, and compensates for motion interference without requiring manual probe placement or configuration by the operator.
3Measurement precision
If traditional ECG and PPGG equipment is used, then cardiac parameters can be monitored, but loss of time occurs due to the need for subject proximity and equipment setup
Solution Approach 1:
The patent replaces traditional electrical and optical sensing systems (ECG electrodes requiring skin contact, PPGG requiring light path alignment) with a mechanical piezoelectric sensor system. This substitution allows the sensor to detect cardiac vibrations through direct mechanical coupling with the body, eliminating the need for complex electrical connections and optical alignment procedures.
4Duration of action of moving object
If piezoelectric sensors are attached to the body for continuous monitoring, then duration of action is improved, but object-affected harmful factors worsen due to subject discomfort and movement restriction
Solution Approach 1:
The patent segments the monitoring function into a small, lightweight piezoelectric sensor that can be attached to convenient body locations such as the chest or back. This segmentation allows the sensor to remain close to the heart for continuous monitoring while minimizing the burden on the subject compared to traditional bulky monitoring equipment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables real-time, continuous monitoring of cardiac activity with high accuracy, reducing equipment burden and allowing subjects to move freely, providing reliable cardiac parameter extraction without the need for invasive setups.
Implementation Method 1
obtaining a first piezoelectric electrical signal from the at least one piezoelectric sensor. The first piezoelectric electrical signal is based on mechanical movement of the body part related to a breathing activity of the subject
Data Source
AI summary
A method and system for extracting cardiac cycle parameters from a respiration signal is disclosed. The technique comprises an array of piezoelectric sensors planted on the chest. The chest membrane exhibits the characteristics of bulky attenuator with certain time delay. Contractions and expansions of the heart and lungs muscles model a mechanical load and produce a relative induced strain on the piezoelectric sheet which in turn causes the piezoelectric material to generate a corresponding conformal voltage signal that is mapped with the heart actions. The resultant voltage signal is therefore used to extract and model the corresponding heart parameters utilizing piezoelectric as well as signal processing theories. a direct relationship is established between the output voltage produced by the piezoelectric transducer under hold breathing and the respiration signal collected by the same transducer with respiration.