Surface Pulse Wave Detection Using Incoherent Light Segmentation
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Solution Overview
Problem
Current non-invasive methods for detecting biometric information, such as pulse waves, often lack accuracy and reliability, particularly in measuring blood vessel dynamics and blood pressure, due to limitations in signal extraction and analysis.
Innovation Solution
An apparatus comprising a surface pulse wave measurement unit with incoherent light sources and photodetectors, along with a biometric signal extractor that includes peak, dicrotic notch, and pulse transit time detectors, and an analyzer for extracting and analyzing parameters like blood vessel elasticity, flow rate velocity, and blood pressure, using both surface pulse wave and photo-plethysmogram signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-invasive pulse wave detection methods are used, then ease of operation and comfort are improved, but measurement precision and reliability deteriorate
Solution Approach 1:
The detection system is segmented into multiple independent detection units, each equipped with light sources and photodetectors positioned at different locations. Multiple pulse wave signals are detected simultaneously from different positions on the blood vessel, and these signals are processed separately before being combined for comprehensive analysis, thereby improving measurement precision while maintaining non-invasive operation
Solution Approach 2:
Optical elements including light sources and photodetectors are introduced as intermediaries to detect pulse wave characteristics non-invasively. The system uses light reflection and absorption properties of blood vessels to obtain pulse wave signals without direct contact with blood flow, thereby maintaining ease of operation while achieving reliable measurements through optical mediation
2Device complexity
If simple non-invasive detection methods are used, then device complexity is reduced, but measurement precision and reliability of blood vessel dynamics deteriorate
Solution Approach 1:
The detection apparatus is divided into multiple modular detection units, each containing light sources and photodetectors. This segmentation allows the system to maintain relatively simple individual units while achieving reliable blood vessel dynamics measurement through the combined data from multiple units detecting pulse waves at different positions
Solution Approach 2:
The detection system is designed with multi-functional capability to measure various blood vessel dynamics parameters including pulse wave velocity, blood flow velocity, and vessel elasticity. By integrating multiple detection functions into a unified system, the apparatus achieves reliable comprehensive measurement without requiring separate complex devices for each parameter
3Measurement precision
If multiple detection parameters are extracted, then measurement precision of biometric information is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary detection of pulse wave signals at multiple positions before extracting various biometric parameters. By first obtaining raw pulse wave data from multiple detection units and then processing this data to extract parameters such as pulse wave velocity, blood flow velocity, and vessel elasticity, the system achieves high measurement precision while managing device complexity through sequential processing
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
This solution provides accurate and reliable extraction of biometric parameters, enhancing the detection of blood vessel dynamics and blood pressure analysis, improving non-invasive biometric information detection with increased precision and usability.
Implementation Method 1
at least one photodetector configured to measure an intensity of light radiated by the at least one light source and reflected from a surface of the object
Implementation Method 2
at least one photodetector configured to measure an intensity of light
Data Source
AI summary
An apparatus for detecting biometric information of a living body detects a pulse wave and extracts the biometric information of the living body in a non-invasive method. The apparatus for detecting biometric information includes a surface pulse wave measurement unit for measuring a surface pulse wave of an object. The surface pulse wave measurement unit includes at least one light source that radiates incoherent light and at least one photodetector that measures an intensity of light radiated by the at least one light source and reflected from a surface of the object. The surface pulse wave measurement unit measures the surface pulse wave of the object based on a change in the intensity of the light reflected from the surface of the object.