Bio-information Estimation via Scattering Coefficient Noise Correction
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Solution Overview
Problem
Existing non-invasive methods for estimating bio-information, such as triglycerides, face accuracy issues due to noise factors like physical/chemical changes in the skin and other blood substances, which affect the scattering coefficient change, leading to degraded results.
Innovation Solution
An apparatus and method that utilize a sensor to emit light and detect scattered light, with a processor acquiring absorbance and scattering coefficient changes, correcting the scattering coefficient using a relation equation defined by noise components from two blood samples, and applying a bio-information estimation model to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-invasive optical measurement is used to estimate bio-information, then ease of operation and non-invasiveness are improved, but measurement precision deteriorates due to noise factors from skin changes and hemodynamic variations
Solution Approach 1:
The patent segments the scattering coefficient change into multiple components: one caused by bio-information (triglycerides) and another caused by noise factors (skin changes, hemodynamic variations). By separating these components through multi-wavelength measurement and mathematical processing, the system can isolate the bio-information signal from interfering noise, thereby maintaining measurement precision while preserving the non-invasive advantage.
2Device complexity
If scattering coefficient change is used to estimate triglyceride concentration, then measurement simplicity is improved, but measurement precision deteriorates because other blood substances also affect the scattering coefficient
Solution Approach 1:
The patent utilizes parameter changes by measuring at multiple wavelengths and analyzing the differential response of the scattering coefficient to various blood components. By changing the measurement parameter (wavelength) and observing how different substances (triglycerides vs. other blood components) affect scattering differently, the system can selectively extract triglyceride concentration information while filtering out interference from other substances.
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
The solution enhances the accuracy of bio-information estimation by isolating noise components from the scattering coefficient change, allowing for precise measurement of bio-parameters like blood sugar, cholesterol, triglycerides, skin temperature, and uric acid.
Implementation Method 1
a device including a light source and an optical sensor is placed on a blood vessel and a scattered light signal passing through blood is measured
Implementation Method 2
acquire, based on an intensity of the detected light, a first absorbance coefficient change
Data Source
AI summary
An apparatus for estimating bio-information may include a sensor configured to emit light to an object and detect light scattered or reflected from the object and a processor configured to acquire, based on an intensity of the detected light, a first absorbance coefficient change and a first scattering coefficient change, relative to a reference time point, acquire a second scattering coefficient change based on the first absorbance coefficient change, and correct the first scattering coefficient change based on the acquired second scattering coefficient change.