Blood Pressure Measurement Using ECG and PPG Signals
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Solution Overview
Problem
Current blood pressure measurement methods, such as pulse wave sphygmomanometers, face challenges in accuracy due to subjective judgments and inability to provide continuous, reliable measurements, especially with cuff-based methods causing discomfort and precision issues.
Innovation Solution
An electronic device that acquires electrocardiosignals and blood oxygen volume wave signals to determine beat-wise diastolic and systolic blood pressures using trained neural network models, with differential processing and principal component analysis to improve measurement accuracy and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cuff-based blood pressure measurement methods are used, then blood pressure values can be obtained, but measurement accuracy deteriorates due to subjective judgment and discomfort
Solution Approach 1:
The patent replaces the traditional mechanical cuff-based measurement system with an optical sensing system using photoplethysmography (PPG) to detect blood volume pulse waves. This substitution eliminates the need for inflating cuffs that cause discomfort, while providing continuous, objective measurements through optical detection of blood volume changes in the tissue.
Solution Approach 2:
The patent introduces pulse wave transmission time (PWTT) as an intermediary parameter to indirectly determine blood pressure. Instead of directly measuring pressure with a cuff, the system measures the time delay between ECG R-wave and PPG pulse wave, which correlates with blood pressure changes, providing an accurate and comfortable indirect measurement method.
2Duration of action of stationary object
If traditional pulse wave sphygmomanometers are used, then blood pressure can be measured, but continuous measurement capability deteriorates due to discontinuous pulse beating events
Solution Approach 1:
The patent implements continuous blood pressure measurement by continuously monitoring pulse wave transmission time through ongoing ECG and PPG signal acquisition. The system processes each heartbeat cycle continuously, calculating BP values for every pulse wave detected, thereby transforming discontinuous pulse events into a continuous blood pressure monitoring stream without gaps between measurements.
3Measurement precision
If beat-wise blood pressure measurement is implemented, then measurement detail and accuracy improve, but processing complexity increases
Solution Approach 1:
The patent performs preliminary processing of ECG and PPG signals by detecting characteristic points (R-wave in ECG, peak points in PPG) and calculating pulse wave transmission time before blood pressure computation. This preliminary extraction of key features simplifies the subsequent BP calculation process, making beat-wise measurement feasible by reducing raw signal data to essential timing parameters.
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 accurate and continuous blood pressure measurement without discomfort, improving user experience by providing multiple blood pressure values per measurement period, enhancing the reliability of cardiovascular function assessment.
Implementation Method 1
a blood oxygen volume wave signal... acquired by a photodetector
Data Source
AI summary
Embodiments of the present disclosure provide a blood pressure measuring method, a blood pressure measuring apparatus, an electronic device and a computer readable storage medium. The electronic device includes a processor configured to: acquire an electrocardiosignal and a blood oxygen volume wave signal of a target object within a preset measurement period; and determine beat-wise blood pressure values of the target object within the preset measurement period by means of a first trained blood pressure calculation model based on the acquired electrocardiosignal and blood oxygen volume wave signal.