Driver Tissue Spectroscopy for Non-Invasive Alcohol Detection
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Solution Overview
Problem
Current alcohol measurement methods, such as blood and breath testing, are invasive, unreliable, and sensitive to physiological and environmental factors, lacking a non-invasive alternative with sufficient accuracy and precision for determining analyte presence and concentration.
Innovation Solution
A non-invasive system using solid-state light sources, optical detectors, and a controller to measure analyte levels in tissue, incorporating a novel tissue interface device for sampling and data acquisition, with optimized subsystems for reproducible measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blood measurement is used to determine alcohol intoxication levels, then measurement accuracy is improved, but invasiveness and sample handling complexity increase
Solution Approach 1:
The patent replaces the mechanical/invasive blood sampling system with an optical spectroscopy system that measures alcohol through light absorption in tissue. The system uses a light source, optical path through tissue, and detector to non-invasively determine alcohol concentration, eliminating needles, blood draws, and laboratory processing while maintaining measurement accuracy through Beer-Lambert law-based optical detection
Solution Approach 2:
The patent introduces tissue as an intermediary medium between the alcohol in the body and the measurement device. Instead of directly measuring blood alcohol through invasive sampling, the system measures light absorption through tissue, which correlates with alcohol concentration. This intermediary approach enables non-invasive measurement while preserving accuracy through proper calibration and correction for tissue optical properties
2Ease of operation
If breath testing is used for alcohol measurement, then invasiveness is reduced, but measurement reliability deteriorates due to partition coefficient variability
Solution Approach 1:
The patent replaces the breath testing mechanical system with optical spectroscopy that directly measures alcohol in tissue. This substitution eliminates the need for breath collection, partition coefficient calculations, and alveolar air sampling, providing more reliable direct measurement of alcohol concentration without the variability inherent in breath-blood partition relationships
Solution Approach 2:
The patent creates an optical copy or proxy measurement of alcohol concentration by measuring light absorption characteristics that correlate with alcohol presence in tissue. Instead of directly analyzing blood or breath, the system uses optical properties of tissue as a proxy, creating a reliable indirect measurement that avoids the reliability issues of breath testing while maintaining non-invasiveness
3Ease of operation
If non-invasive spectroscopy is implemented, then ease of operation is improved, but measurement precision deteriorates due to tissue spectral complexities
Solution Approach 1:
The patent applies local quality by selecting specific wavelengths of light that correspond to alcohol absorption peaks and are less affected by tissue spectral variations. The system uses wavelength selection and differential measurement at multiple wavelengths to isolate the alcohol signal from tissue background, improving precision while maintaining non-invasive operation
Solution Approach 2:
The patent changes measurement parameters by using multiple wavelengths, varying path lengths, and different optical geometries to distinguish alcohol signals from tissue interference. The system employs parameter variation in the optical measurement process, including wavelength modulation and path length adjustment, to enhance signal specificity and measurement precision despite tissue spectral complexities
4Measurement precision
If multiple wavelengths of light are used for measurement, then analyte detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using a single optical system that can operate at multiple wavelengths through a combination of light sources and spectral filtering. The system integrates multiple functions (light generation, wavelength selection, tissue interaction, and detection) into a unified portable device, achieving multi-wavelength measurement capability without proportionally increasing overall device complexity
Solution Approach 2:
The patent merges multiple wavelength measurements into a single integrated optical path and detection system. By combining light sources, optical components, and detection electronics into a unified portable device, the system achieves multi-wavelength analytical capability while minimizing the increase in device complexity through integrated design and shared components
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 and precise non-invasive measurement of analytes like alcohol, overcoming tissue spectral complexities and environmental variability, suitable for vehicle applications.
Implementation Method 1
The at least one solid-state light source is configured to emit different wavelengths of light
Implementation Method 2
The one or more optical detectors are configured to detect a portion of the light that is not absorbed by the tissue of the vehicle driver
Data Source
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AI summary
A system for non-invasively measuring an analyte in a vehicle driver and controlling a vehicle based on a measurement of the analyte. At least one solid- state light source is configured to emit different wavelengths of light. A sample device is configured to introduce the light emitted by the at least one solid-state light source into tissue of the vehicle driver. One or more optical detectors are configured to detect a portion of the light that is not absorbed by the tissue of the vehicle driver. A controller is configured to calculate a measurement of the analyte in the tissue of the vehicle driver based on the light detected by the one or more optical detectors, determine whether the measurement of the analyte in the tissue of the vehicle driver exceeds a pre-determined value, and provide a signal to a device configured to control the vehicle.