Portable Breath Sampling System for VOC Analysis
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Solution Overview
Problem
Current breath test procedures are inefficient and prone to errors due to the need for prolonged subject attachment to testing instruments, poor utilization of expensive equipment, staff inconvenience, systematic errors in CO2 measurement, and inaccuracies in volume and isotope concentration analysis, especially for long-term tests requiring special conditions or volatile organic compound analysis.
Innovation Solution
A portable, automatic breath sampling system that collects samples at predetermined intervals or in response to physiological or environmental signals, using capnographic analysis to differentiate breath components and adjust collection rates, allowing for accurate VOC analysis and minimizing equipment usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a real-time breath tester is used for quick breath tests, then the test results are obtained quickly and definitively, but the subject must remain connected to the instrument for the duration of the test
Solution Approach 1:
The breath test process is segmented into two independent phases: (1) breath sample collection phase using a portable device that the subject can wear freely, and (2) analysis phase using the real-time breath tester. This segmentation allows the subject to complete sample collection without continuous instrument attachment, then transfer samples for analysis, thereby reducing the burden of prolonged connection while maintaining test efficiency.
Solution Approach 2:
Breath collection bags serve as an intermediary medium between the subject's breath and the real-time breath tester. The portable device collects breath samples in these bags, which then serve as temporary storage and transport containers. This intermediary allows decoupling of the sample collection process from the analysis process, enabling the subject to move freely during collection while ensuring accurate analysis later.
2Ease of operation
If breath samples are collected in bags for off-line analysis, then the subject does not need to remain connected to the instrument, but the test period becomes longer and samples must be collected until definitive results are obtained
Solution Approach 1:
The portable breath collection device performs preliminary sample collection and preparation before the actual analysis takes place. By collecting multiple breath samples in advance during a short wearing period, the system ensures that sufficient material is available for comprehensive off-line analysis, thereby preventing the need for extended test periods while maintaining subject convenience.
3Reliability
If a single subject monopolizes a breath test instrument for several hours for long-term tests, then continuous monitoring is achieved, but the utilization of the expensive equipment becomes poor and is not cost-effective
Solution Approach 1:
The monitoring function is segmented between the portable collection device (worn by subject) and the stationary analysis instrument. The portable device continuously collects samples independently, allowing the expensive breath tester to be used intermittently for analysis rather than continuously, thereby improving equipment utilization while maintaining continuous monitoring capability through the distributed collection system.
Solution Approach 2:
The portable breath collection device creates physical copies of breath samples in collection bags, which can be analyzed later. This copying approach allows the original monitoring function to be distributed to the portable device, freeing up the expensive breath tester for multiple subjects and purposes, thereby improving overall equipment utilization while preserving continuous data collection.
4Device complexity
If breath samples are manually taken without concentration regulation, then the collection procedure is simple, but systematic errors in CO2 measurement occur due to differences in CO2 content between samples
Solution Approach 1:
The portable breath collection device incorporates feedback mechanisms that monitor breath characteristics (such as CO2 concentration, flow rate, or breath phase) and automatically adjust the sampling process accordingly. This feedback control ensures that samples are collected under consistent conditions, eliminating systematic errors while maintaining procedural simplicity through automated adjustment rather than manual intervention.
5Device complexity
If conventional methods assume constant volume based on patient weight and height, then the procedure is simple, but accurate volume measurement is not achieved due to physiological factors
Solution Approach 1:
The conventional mechanical/assumption-based volume estimation method (based on weight and height formulas) is replaced with a sensor-based measurement system in the portable device. This system directly measures breath volume, flow rate, or uses capnographic analysis to determine actual exhaled volume, thereby achieving accurate volume measurement that accounts for real-time physiological variations without requiring complex procedural changes.
Data Source
AI summary
An automatic breath collecting and sampling system, which is preferably carried by the subject, or otherwise kept with him or near him, for the recommended duration of the collection period. The system collects samples in separate switchable containers, either at predetermined time intervals, or in response to an automatic stimulus, which could be related to the breath content itself, or to another physiological signal, such as the subject s pulse rate, breath rate, blood pressure, or temperature, or in response to a signal related to an environmental effect, such as the presence of a strong concentration in the air of a foreign gas, which could be detected by an electrochemical sensor, or manually by the subject after being prompted by the system. After collection of the requisite number of separate containers, they may be detached and sent for analysis or other treatment.