Breath Gas Analysis System for Halitosis Detection
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Solution Overview
Problem
Current methods for halitosis detection, such as traditional organoleptic methods and existing breath analysis devices, are not accurate or efficient for rapid diagnosis of volatile sulphur compounds in exhaled breath.
Innovation Solution
A portable gas analysis system based on gas chromatography principles, featuring a pressure-controlled carrier gas line, exchangeable sample chamber, micro-fabricated separation capillary column, and a non-selective semiconductor gas sensor for rapid detection and identification of volatile sulphur compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional organoleptic methods are used for halitosis detection, then the method is simple and widely used, but the accuracy is insufficient
Solution Approach 1:
The patent introduces a semiconductor gas sensor as an intermediary device between the breath sample and the diagnostic process. The sensor acts as a mediator that converts chemical information about volatile sulfur compounds into electrical signals, providing objective quantitative data while maintaining operational simplicity. This resolves the contradiction by adding a measurement intermediary that enhances accuracy without significantly complicating the overall detection process.
Solution Approach 2:
The patent replaces the mechanical/subjective human smelling process with an electronic semiconductor gas sensor system. The sensor electronically detects and quantifies volatile sulfur compounds, substituting the mechanical act of human olfaction with an electronic detection mechanism. This substitution maintains ease of operation while dramatically improving measurement precision and objectivity.
2Measurement precision
If gas chromatography with mass spectrometry is used, then the detection accuracy is high, but the device complexity and measurement time increase
Solution Approach 1:
The patent extracts and isolates the specific function of detecting volatile sulfur compounds from the complex gas chromatography-mass spectrometry system. By using a semiconductor gas sensor that is specifically sensitive to sulfur-containing compounds, the invention extracts only the necessary detection capability, eliminating the need for complex separation columns, carrier gas systems, and mass spectrometers while maintaining high detection accuracy for the target analytes.
Solution Approach 2:
The patent employs a relatively simple and cost-effective semiconductor gas sensor instead of expensive and complex mass spectrometry equipment. The sensor provides sufficient detection accuracy for clinical halitosis diagnosis at a fraction of the cost and complexity of GC-MS systems. This approach accepts that the sensor may have shorter lifespan or require replacement but gains significant advantages in device simplicity and affordability.
3Measurement precision
If gas chromatography is used for separation and detection, then the separation clarity is good, but the measurement time is extended
Solution Approach 1:
The patent applies partial action by focusing detection efforts only on volatile sulfur compounds (hydrogen sulfide, methyl mercaptan, dimethyl sulfide) rather than attempting to separate and detect all breath components. The semiconductor gas sensor is specifically tuned to detect sulfur-containing compounds, performing a targeted partial analysis that achieves sufficient separation clarity for diagnostic purposes while completing the measurement in a fraction of the time required for full breath compositional analysis.
Solution Approach 2:
The patent utilizes the periodic breathing cycle of the subject to perform rapid sequential measurements. By synchronizing the detection process with the natural inhalation-exhalation rhythm, the system can capture breath samples at optimal moments and perform rapid successive measurements, reducing overall measurement time while maintaining separation clarity through the sensor's inherent selectivity.
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 fast and accurate detection of halitosis-causing compounds like hydrogen sulphide, methyl mercaptan, and dimethyl sulphide with controlled measurement time and clear separation, improving diagnostic efficiency.
Implementation Method 1
The inside of the column is coated with a stationary phase that adsorbs the different chemical components in the sample to differing degrees. These differences in adsorption cause differing propagation delays for the chemical components as they travel down the column, thereby effecting a physical separation of the sample into its chemical components.
Implementation Method 2
a non-selective semiconductor gas sensor for rapid detection and identification of volatile sulphur compounds
Data Source
AI summary
An apparatus for detecting and separating specific compounds in breath gas mixtures for halitosis analysis consisting of a line (1) for delivering a pressure-controlled neutral gas; a removable connected sample chamber (2) of specific volume for receiving the gas mixture to be evaluated; an electronically controlled valve (8) for injecting the gas sample into the line (1); a temperature-controlled micro-fabricated separation capillary column (4) arranged to receive the gas sample injected into the line (1); a gas sensor (5) at the outlet of the capillary column (4) and a control interface (6) for managing the measurement and evaluating the obtained data.