Sidestream Gas Sampling Circuit Segmentation for Cross-Contamination Control
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Solution Overview
Problem
Conventional sidestream gas sampling systems face issues with contamination and performance degradation due to contact between gas samples and non-contacting components, leading to cross-contamination and increased maintenance costs when used on multiple patients.
Innovation Solution
A sidestream gas sampling apparatus with a gas sampling circuit that separates gas-contacting components from non-contacting components, allowing the gas-contacting components to be easily replaced or reused, while the non-contacting components remain contamination-free and are reused or easily maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas samples are transported through a closed sampling circuit containing both gas-contacting and non-contacting components, then complete gas sampling can be achieved, but contamination of non-contacting components occurs leading to cross-contamination between patients
Solution Approach 1:
The sampling circuit is divided into two distinct segments: a disposable gas-contacting segment and a reusable non-contacting segment. The gas-contacting components (sampling tube, flow control valve, sample chamber) are separated from the non-contacting components (pump, analysis equipment, control electronics). This segmentation allows the gas-contacting parts to be discarded after each patient while the non-contacting parts remain contamination-free and reusable across multiple patients, eliminating cross-contamination risk.
Solution Approach 2:
The gas-contacting components are designed as disposable, single-use elements that are discarded after each patient interaction. These include the sampling tube, flow control valve, and sample chamber, which come into direct contact with patient breath samples. By making these components disposable, the system eliminates the risk of cross-contamination between patients while maintaining cost-effectiveness through selective replacement of only the contaminated portions.
2Reliability
If all components are made disposable to eliminate contamination, then patient safety is improved, but manufacturing and operating costs increase
Solution Approach 1:
The system is segmented into disposable and reusable components, allowing selective disposal of only the gas-contacting parts while retaining and reusing the non-contacting parts. This reduces manufacturing costs compared to making the entire system disposable, as the expensive non-contacting components (pump, analysis equipment, control electronics) are reused across multiple patients without requiring sterilization or replacement.
Solution Approach 2:
Only the necessary gas-contacting components are made disposable at low cost, while the expensive non-contacting components are designed for long-term reuse. This selective disposable approach minimizes manufacturing and operating costs by replacing only the inexpensive, contaminated parts rather than the entire system.
3Ease of manufacture
If non-contacting components are reused across multiple patients, then operating costs are reduced, but cross-contamination risk increases
Solution Approach 1:
The system architecture segments components into gas-contacting and non-contacting categories, ensuring that only the gas-contacting components interact with patient samples. The non-contacting components (pump, analysis equipment, control electronics) remain isolated from patient breath, eliminating cross-contamination risk while enabling reuse across multiple patients.
Solution Approach 2:
A disposable intermediary sampling circuit acts as a barrier between the patient and the reusable non-contacting components. This intermediary segment (sampling tube, flow control valve, sample chamber) is discarded after each patient, preventing any potential contamination from reaching the reusable components, thus allowing safe reuse without cross-contamination risk.
4Ease of repair
If the sampling circuit is opened to allow easy component replacement, then maintenance becomes simpler, but gas leakage and contamination control become more difficult
Solution Approach 1:
The sampling circuit is segmented into modular disposable and reusable sections, allowing easy replacement of the gas-contacting components without opening the entire circuit. The disposable segment can be quickly exchanged while the reusable segment remains closed and contamination-free, maintaining both ease of maintenance and contamination control.
Solution Approach 2:
The gas-contacting components are designed as disposable elements that can be easily replaced after each patient interaction. This eliminates the need for complex cleaning and sterilization procedures while maintaining a closed, contamination-controlled system. The disposable nature simplifies maintenance by replacing rather than repairing, and the closed design of each disposable unit ensures contamination control.
Data Source
AI summary
The invention provides a sidestream gas sampling apparatus having a gas sampling circuit and a set of reusable elements. The gas sampling circuit carries the gas sample from a main flow of gas, through a sample analysis area, and vents the gas sample to an analyzed gas destination. The reusable components provide motive forces to remove the gas sample through the gas sampling circuit and provide analysis components for the gas sampling apparatus while not making contact with the gas sample. As such, the reusable components do not become contaminated by the gas sample and do not have to be cleaned or sterilized between applications.