Optical Blood Parameter Measurement via Spectral Shape Analysis
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Solution Overview
Problem
Existing blood parameter monitors using optical measurements face challenges such as inaccurate light transmission due to skin variations, motion artifacts, and limited wavelength techniques, leading to poor signal-to-noise ratios and increased susceptibility to ambient interference, which affects the accuracy of oxygen saturation and hemoglobin concentration measurements.
Innovation Solution
An indwelling system employing a broad-spectrum light source, waveguides for transmitting and capturing light, a spectrometer for decomposing remitted light into spectral components, and a processor for comparing these components to a database of known morphologies to determine blood parameters like oxygen saturation, oxyhemoglobin percentage, and total hemoglobin concentration simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a limited number of wavelengths are used for optical measurement, then the device complexity is reduced, but the signal-to-noise ratio deteriorates and measurement precision is reduced
Solution Approach 1:
The patent segments the optical measurement into multiple discrete wavelength channels (at least 3, preferably more) to capture spectral information at different wavelengths. This segmentation allows the system to analyze spectral shapes and patterns, improving measurement precision and signal-to-noise ratio while maintaining manageable device complexity through modular wavelength detection architecture
Solution Approach 2:
The patent transitions from single-wavelength or dual-wavelength measurement to multi-wavelength spectral measurement, adding the dimension of spectral analysis. By measuring light absorption across multiple wavelengths and analyzing the spectral shape, the system achieves better measurement precision and robustness against noise without proportionally increasing device complexity
2Ease of operation
If non-invasive optical measurement is used, then ease of operation is improved, but measurement precision deteriorates due to skin variations and motion artifacts
Solution Approach 1:
The patent changes the measurement parameter from single-wavelength intensity to multi-wavelength spectral shape analysis. By analyzing the shape of the absorption spectrum across multiple wavelengths rather than relying on absolute intensity at one or two wavelengths, the system becomes insensitive to skin pigmentation variations, motion artifacts, and other confounding factors, thereby maintaining high measurement precision in non-invasive applications
Solution Approach 2:
The patent converts the harmful effect of skin pigmentation and tissue variations into a beneficial feature by using spectral shape analysis. Instead of being disrupted by these variations, the system uses the characteristic spectral fingerprints of hemoglobin at different wavelengths to extract accurate blood parameter information, turning potential sources of error into confirmation signals for measurement accuracy
3Measurement precision
If invasive catheter-based measurement is used, then measurement precision is improved, but reliability deteriorates due to infection risk and calibration requirements
Solution Approach 1:
The patent implements self-calibration through spectral shape matching algorithms that compare measured spectra against reference spectral libraries. The system automatically determines blood parameters by pattern recognition rather than requiring external calibration standards or invasive blood draws, achieving both high measurement precision and improved reliability by eliminating calibration-related infection risks and maintenance requirements
4Measurement precision
If broad-spectrum light source is used, then measurement precision is improved through better spectral coverage, but use of energy increases
Solution Approach 1:
The patent segments the broad spectrum into discrete wavelength channels of interest, using targeted optical filters or wavelength-selective detectors to measure only the specific spectral regions where hemoglobin has diagnostic absorption features. This approach maintains the measurement precision benefits of broad-spectrum analysis while reducing energy consumption by excluding irrelevant wavelengths from detection
Solution Approach 2:
The patent extracts and analyzes only the relevant spectral components from the broad-spectrum light that contain information about blood parameters. By using optical filtering to isolate specific wavelength bands where hemoglobin absorption is diagnostic, the system achieves accurate measurement with reduced energy consumption compared to detecting the entire broad spectrum
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 system provides accurate and reliable simultaneous measurement of multiple blood parameters without the need for intermittent calibration, reducing the risk of nosocomial infection and labor-intensive validation processes, while minimizing the impact of skin pigmentation and motion artifacts.
Implementation Method 1
a light source configured to generate light over a broad spectrum. Generated light from the light source is directed into the blood through a fiber optic waveguide
Implementation Method 2
a spectrometer for determining the spectral composition of the remitted light
Implementation Method 3
The processor compares the spectral composition to a database of known morphologies
Data Source
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AI summary
A system for optically measuring blood parameters including a light source and light transmitter for transmitting light to the blood, a light remitter for capturing remitted light, a spectrometer breaking the remitted light into its spectral components and a processor for comparing a morphologically distinct portion of the remitted light to a database of known morphologies. Each of the known morphologies corresponds to a measurement value at least one parameter, such as an analyte. Advantageously, the determined morphologies can uniquely correspond to two or more blood parameters, such as O2Hb and tHb, allowing simultaneous determination of the two parameters.