Breath THC Detection with Ambient Air Baseline Correction
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Solution Overview
Problem
Existing technologies face challenges in accurately measuring low levels of tetrahydrocannabinol (THC) in breath samples due to its prevalence in parts per trillion, making it difficult to determine recent use and impairment, especially in non-invasive roadside testing.
Innovation Solution
A method involving immunoassay-based detection systems that compare THC levels in breath samples with ambient air samples, using capture agents and signal amplification reagents to achieve picogram sensitivity, and incorporate a test cartridge with microfluidic devices for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If breath sampling is performed to detect THC, then non-invasive detection is achieved, but ambient contamination makes it difficult to distinguish consumption-related THC from environmental exposure
Solution Approach 1:
The patent divides the breath sample analysis into two distinct components: a first breath sample taken before ambient exposure and a second breath sample taken after ambient exposure. By segmenting the sampling process into these two separate measurements, the system can isolate and subtract the ambient THC contribution from the total THC level, thereby accurately determining consumption-related THC while maintaining non-invasive detection.
2Measurement precision
If ambient air sampling is performed to measure background THC levels, then ambient contamination can be quantified, but the complexity of the testing system increases
Solution Approach 1:
The patent combines the ambient air sampling function with the breath analysis system by integrating an ambient air sensor into the same device that performs breath THC measurement. This merging allows the system to simultaneously or sequentially measure both breath THC and ambient air THC using comparable methodologies, enabling direct comparison and calculation of consumption-related THC without requiring entirely separate testing equipment.
3Measurement precision
If sensitive detection methods are used to detect picogram levels of THC, then detection capability is improved, but the system becomes more susceptible to ambient contamination interference
Solution Approach 1:
The patent implements a feedback mechanism where the ambient THC measurement obtained from the first breath sample (taken before ambient exposure) serves as a baseline reference. This baseline is then subtracted from the second breath sample measurement (taken after ambient exposure) to calculate the consumption-related THC. The feedback loop of using the first measurement to correct the second measurement allows the sensitive detection system to distinguish true consumption signals from ambient contamination interference.
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
Enables reliable, non-invasive roadside detection of THC use by distinguishing between consumption-related THC and ambient contamination, providing a positive test result independent of user frequency, with enhanced sensitivity and device scalability.
Implementation Method 1
immunoassay-based detection systems that compare THC levels in breath samples with ambient air samples, using capture agents and signal amplification reagents to achieve picogram sensitivity
Implementation Method 2
a breath sample generally includes aerosol droplets or particles, which in turn contain various lung proteins and surfactants. Provided herein are breath collection modules, trapping structures, impaction ports, materials, and extraction solutions to trap droplets
Data Source
AI summary
Accurate measurement of breath-borne analyte(s) is disclosed, in which such a measurement can be compared to a background level of the analyte(s) in an ambient air sample. Methods, systems, and devices can include use of this background level for the purposes of detection and/or measurement of an analyte (e.g., THC) in breath samples of for law enforcement, health, and safety applications.