Exhaled CO2 Detection Device with Air Path Switching
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Solution Overview
Problem
Current carbon dioxide detection systems for human exhaled air are hindered by high costs, large size, frequent maintenance needs, and delayed analysis due to temperature and humidity changes, as well as limitations in continuous monitoring and post-processing of exhaled air, leading to inaccurate and inconvenient measurements.
Innovation Solution
A real-time dynamic and quantitative detection device featuring a face mask with one-way valves, an air path switching element, a detection chamber with a carbon dioxide sensor, and a micropump, which allows for continuous and dynamic monitoring of exhaled carbon dioxide while maintaining a closed detection environment using a carbon dioxide absorber to prevent re-entry of CO2 into the chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared analyzers or mass spectrometers are used for carbon dioxide detection, then measurement accuracy and stability are improved, but device cost and size increase significantly
Solution Approach 1:
The patent extracts only the essential detection function from complex infrared analyzers and mass spectrometers by using a simplified optical path with a二氧化碳 sensor. The device isolates the core measurement capability while removing unnecessary complex components, achieving accurate detection with a compact structure suitable for portable use.
Solution Approach 2:
The patent employs cost-effective infrared sensors and simple optical components instead of expensive mass spectrometers. The design prioritizes economical materials and straightforward construction, making the device affordable and suitable for widespread clinical application without sacrificing essential measurement functionality.
2Productivity
If constant sampling is performed for carbon dioxide detection, then real-time monitoring capability is improved, but response speed decreases due to temperature and humidity changes
Solution Approach 1:
The patent pre-heats the detection chamber and stabilizes environmental conditions before actual measurement begins. This preliminary preparation eliminates the lag caused by temperature and humidity adjustments during sampling, enabling immediate accurate detection when exhaled air enters the chamber without analysis delays.
Solution Approach 2:
The device uses periodic one-way valve operation to control air flow through the detection chamber, allowing continuous monitoring through rhythmic sampling cycles. This periodic mechanism ensures fresh exhaled air is continuously introduced while maintaining stable detection conditions, achieving real-time monitoring without the delays associated with continuous uncontrolled sampling.
3Ease of operation
If bypass type monitoring is used for non-invasive detection, then patient comfort is improved, but long-term continuous monitoring becomes inconvenient
Solution Approach 1:
The patent implements continuous operation capability through stable power supply design, automated one-way valve control, and sustained sensor functionality. The device maintains uninterrupted detection over extended periods with consistent performance, enabling long-term continuous monitoring while preserving the non-invasive comfort of bypass type design through automated operational sequences.
4Device complexity
If exhaled air is not processed after detection, then device complexity is reduced, but carbon dioxide concentration in inhaled air increases creating harmful effects
Solution Approach 1:
The patent extracts and isolates the carbon dioxide detection function from the complete respiratory gas management system. By separating detection from air processing, the device achieves accurate measurement without requiring complex air handling mechanisms, while the simple one-way valve system naturally prevents re-breathing of concentrated carbon dioxide without adding processing complexity.
Solution Approach 2:
The one-way valve acts as an intermediary element that controls air flow direction between the patient and detection chamber. This simple mediating component ensures exhaled air with high carbon dioxide concentration is directed away from the patient's inhalation path, preventing harmful re-breathing while maintaining device simplicity without requiring complex active processing systems.
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 continuous, real-time, and accurate detection of carbon dioxide in exhaled air, ensuring independence from environmental factors and reducing environmental pollution, while maintaining normal respiration and providing a convenient and user-friendly operation.
Implementation Method 1
at least one carbon dioxide sensor connected with an external upper computer is provided in the detection air chamber
Data Source
AI summary
Disclosed is a real-time dynamic and quantitative detection device for carbon dioxide in human exhaled air, which comprises: a face mask which comprises an air inlet and an air outlet; an inhalation channel connected with the air inlet of the face mask, a first one-way valve is provided in the inhalation channel; an exhalation channel connected with the air outlet of the face mask, a second one-way valve is provided in the exhalation channel; an air path switching element connected with the exhalation channel to realize the switching between an exhalation air path to be detected and an inflation air path; a detection air chamber connected with the exhalation channel, at least one carbon dioxide sensor connected with an external upper computer is provided in the detection air chamber; before detection, the air path switching element switches to the inflation air path to clean and initialize the detection air chamber; during detection, the air path switching element switches to the exhalation air path to be detected, then the human exhaled air enters the detection air chamber through the exhalation channel, and real-time dynamic and quantitative detection of carbon dioxide in the exhaled air is realized by the carbon dioxide sensor. Compared with the prior art, the present invention has the advantages of high detection precision, convenient use, and the like.