Contact-Free Breath Sampling Circuit for Accurate Analyte Detection
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Solution Overview
Problem
Existing breath analyzers require mouth contact for sample collection, which is undesirable due to concerns over disease transmission and cross-contamination, and contactless methods face challenges like sample dilution and false positives.
Innovation Solution
A contact-free breath analysis apparatus with dual inlets and pumps, using pressure sensors and microfluidic channels to direct and process breath samples without physical contact, ensuring accurate analyte detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mouthpiece is used for breath sample collection, then the risk of cross-contamination and disease transmission is reduced, but user comfort decreases and hygiene concerns increase
Solution Approach 1:
The patent removes the mouthpiece component entirely from the breathalyzer system, extracting the harmful element that causes user discomfort and hygiene concerns while maintaining the core function of breath sample collection through alternative means (optical sensors detecting breath condensation on a mirror surface)
Solution Approach 2:
The patent replaces the mechanical mouthpiece-based sample collection system with an optical detection system that uses infrared sensors to detect breath condensation patterns on a mirror, eliminating the need for physical contact between the user and the device
2Ease of operation
If contactless breath collection is implemented, then user comfort and hygiene improve, but sample dilution increases and false positives occur
Solution Approach 1:
The patent introduces a mirror surface as an intermediary medium that captures breath condensation in a controlled manner. The breath condenses on the mirror surface, creating a localized concentration of analytes that can be detected optically, thereby preventing sample dilution even in contactless operation
Solution Approach 2:
The patent utilizes changes in optical properties (infrared absorption characteristics) of the breath condensation on the mirror surface to detect and differentiate between various substances, enabling accurate detection without physical contact
3Reliability
If contactless breath analysis is used, then cross-contamination risk decreases, but false positives increase due to cross-reactivity with environmental substances
Solution Approach 1:
The patent employs multiple infrared sensors detecting different spectral regions to analyze the breath sample. By using excessive detection channels (multiple wavelengths and sensor types), the system can differentiate between target analytes and environmental contaminants, reducing false positives while maintaining contactless operation
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 efficient, accurate, and hygienic breath sample analysis with reduced cross-contamination and dilution, providing rapid results for substances like alcohol and cannabis.
Implementation Method 1
a first pump positioned to draw a portion of the breath sample into the sampling arm of the first fluid flow path
Data Source
AI summary
Apparatus and methods for contact-free breath analysis are provided. One aspect provides a pneumatic circuit that can be used for analyzing a contact-free breath sample or a breath sample provided through an inlet tube. Some aspects provide apparatus that can be incorporated into a rearview mirror or steering wheel of a vehicle, or used as a standalone unit.