Fingertip PPG Hypertension Classification Without Cuff Errors
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Solution Overview
Problem
Current blood pressure measurement methods using cuffs are prone to errors due to operation and environmental factors, and there is a need for a non-invasive, accurate, and reliable method for hypertension screening and management.
Innovation Solution
A cuff-less hypertension screening system utilizing a PPG acquisition probe with a three-channel photoelectric module, signal conditioning, and a portable device with SVM classification, enabling real-time evaluation and management of hypertension through PPG signal analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cuff-based blood pressure measurement methods are used, then measurement accuracy can be maintained, but the measurement is easily affected by operation and environmental factors and has white coat phenomenon
Solution Approach 1:
The patent replaces the mechanical cuff-based measurement system with an optical PPG-based measurement system. The PPG acquisition probe uses photodetectors to detect blood volume changes through tissue, eliminating the need for mechanical cuff inflation and deflation. This substitution removes the sources of operational error and environmental sensitivity associated with cuff methods while maintaining measurement accuracy through optical detection of physiological signals.
2Ease of operation
If PPG signal acquisition is used, then non-invasive and convenient measurement is achieved, but the signal contains noise and requires complex processing
Solution Approach 1:
The patent introduces multiple intermediaries to bridge the PPG signal acquisition and final blood pressure determination. These include: (1) Signal conditioning circuits that amplify and filter raw PPG signals, (2) Feature extraction algorithms that identify characteristic waveform parameters, and (3) Machine learning models that map features to blood pressure values. These intermediaries progressively transform the noisy raw signal into reliable clinical information, managing complexity in a structured manner.
Solution Approach 2:
The system employs self-service mechanisms where the PPG signal processing pipeline automatically adjusts to different users and conditions. The machine learning models are trained on diverse datasets and can adapt to individual physiological variations without manual calibration. The system self-calibrates by using the user's own physiological baseline, eliminating the need for manual setup or professional calibration while maintaining accuracy.
3Measurement precision
If traditional blood pressure measurement is used, then clinical accuracy is achieved, but it causes psychological burden and is not suitable for frequent personal use
Solution Approach 1:
The patent employs a disposable or reusable PPG acquisition probe that can be used frequently without the psychological burden associated with traditional clinical measurements. The probe is designed for easy attachment and detachment, similar to consumer wearable devices, eliminating the need for professional medical settings. This approach makes frequent monitoring acceptable and comfortable for personal use while maintaining clinical-grade accuracy through the PPG measurement methodology.
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
Provides accurate, non-invasive, and user-friendly hypertension screening and management, reducing errors and psychological burden, suitable for personal and family use, with high F1 scores for hypertension classification.
Implementation Method 1
A PPG signal is extracted by the use of (1) an LED transmit section to generate the red or infrared light to illuminate the skin of a fingertip, earlobe or forehead and (2) a photosensitive diode to measure the time-varying light absorption by the tissue which can reflect the changes in the blood volume
Data Source
AI summary
A system for screening and management of hypertension, which includes a high precision fingertip photoplethysmography (PPG) acquisition device and the application software of hypertension screening and management in a portable device such as a smartphone. The former includes 905 nm wavelength infrared light emitting sensor, photoelectric receiving device, and Bluetooth transmission module. The latter includes PPG signal configuration and acquisition module, automatic hypertension classification and screening module and hypertension management module. The system can process the real-time PPG signal and can classify and evaluate the blood pressure level and carry on the long-term management and the hypertension health instruction.