Non-invasive Bio-information Measurement via Dual-region Light Scattering
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Solution Overview
Problem
Existing non-invasive bio-information measurement methods face challenges in accurately estimating triglyceride levels in blood due to noise factors such as physical and chemical changes in the skin and hemodynamics, which affect scattered light signals.
Innovation Solution
An apparatus and method that utilize multiple light sources to emit light to both blood vessel and non-blood vessel regions, detecting scattered light signals and correcting the signals based on the rate of change between the two to isolate the scattering coefficient change caused by triglycerides, thereby improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light source is used to measure scattered light signals from blood vessel regions, then the measurement process is simple, but noise factors from skin changes and hemodynamics interfere with measurement accuracy
Solution Approach 1:
The patent divides the measurement system into multiple independent light sources (first light source for blood vessel region, second light source for non-blood vessel region) and corresponding detectors. This segmentation allows separate measurement of signals from different tissue types, enabling noise correction while maintaining manageable system complexity through modular design.
Solution Approach 2:
The patent introduces a non-blood vessel region measurement as an intermediary reference signal. The second light source measures scattered light from non-blood vessel tissue, which serves as a mediator to characterize noise factors (skin changes, hemodynamics) that are not related to triglyceride concentration, allowing these noise factors to be isolated and corrected.
2Reliability
If multiple light sources are used to measure both blood vessel and non-blood vessel regions, then noise interference is reduced, but the device complexity increases
Solution Approach 1:
The patent combines multiple light sources and detectors into an integrated measurement system where the first light source and second light source operate simultaneously or sequentially with their corresponding detectors. The processor merges the signals from both regions, applying correction algorithms that leverage the non-blood vessel signal to clean the blood vessel signal, thereby improving reliability while managing complexity through unified system architecture.
Solution Approach 2:
The patent implements feedback correction where the second electrical signal (from non-blood vessel region) is continuously used to correct the first electrical signal (from blood vessel region). The processor analyzes the noise characteristics from the second region and applies real-time correction to the first region's signal, creating a feedback loop that improves signal accuracy dynamically.
3Productivity
If the scattered light signal is used directly for triglyceride estimation, then the measurement process is straightforward, but various noise factors affect the scattering coefficient changes
Solution Approach 1:
The patent performs preliminary measurement of the non-blood vessel region signal before final triglyceride calculation. By first characterizing the noise factors through the second light source measurement, the system prepares correction data in advance that can be applied to the blood vessel region signal, ensuring accurate scattering coefficient extraction without delaying the overall measurement process.
Solution Approach 2:
The patent transforms the raw scattered light signals into corrected electrical signals by applying parameter-based correction algorithms. The processor modifies the first electrical signal parameters (amplitude, timing) based on the second electrical signal characteristics, effectively changing the signal parameters to remove noise while preserving the triglyceride-related scattering information.
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 approach effectively reduces noise interference, leading to more accurate estimation of triglyceride levels by isolating the scattering coefficient change specific to blood, enhancing the precision of bio-information measurement.
Implementation Method 1
measuring scattered light signals having passed through the blood
Implementation Method 2
detect a first scattered light signal reflected from the first region and a second scattered light signal reflected from the second region
Implementation Method 3
estimate a concentration of triglyceride in blood by placing a measurement device composed of a light source and an optical sensor on a blood vessel and measuring scattered light signals
Data Source
AI summary
An apparatus for non-invasively measuring bio-information is provided. The apparatus includes a plurality of light sources configured to emit light to a first region and a second region of an object, a detector configured to detect a first scattered light signal from the first region and a second scattered light signal from the second region and output a first electrical signal corresponding to the first scattered light signal and a second electrical signal corresponding to the second scattered light signal, and a processor configured to correct the first electrical signal based on the second electrical signal and measure bio-information based on a correction result.