Filter Capsule Assembly With Nafion Tube for Humidity Control
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Solution Overview
Problem
Existing methods for controlling humidification levels in breathing circuit gas samples, such as hydrophobic filters and Nafion™ tubes, are inadequate in precision and structural limitations, leading to potential sensor malfunction due to uncontrolled water vapor and droplet presence.
Innovation Solution
A filter capsule assembly that integrates a Nafion™ tube with a dual membrane filter, secured by tube-retaining clips, allowing for precise humidity control and protection against environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hydrophobic filters are used to remove water from gas samples, then water droplets and condensed water are removed, but gas-phase water cannot be removed and humidification control precision is insufficient
Solution Approach 1:
The patent combines a hydrophobic filter capsule assembly with a Nafion tube in a single integrated unit. The filter capsule removes liquid water and aerosols while the Nafion tube simultaneously removes gas-phase water through hygroscopic properties, achieving comprehensive humidification control that neither component could achieve alone.
Solution Approach 2:
The system uses composite filtering mechanisms combining hydrophobic filter media with hygroscopic Nafion tube material. This composite approach leverages the complementary properties of both materials to achieve both liquid water removal and gas-phase water control, improving measurement precision for gas analysis.
2Measurement precision
If Nafion tubes are used to control humidification, then gas-phase water can be removed, but the tube is vulnerable to damage from environmental conditions and connection instability
Solution Approach 1:
The Nafion tube is nested within the filter capsule assembly structure, with the tube positioned inside the capsule housing. This nesting provides physical protection for the fragile Nafion tube from environmental conditions while maintaining its functional integrity for gas-phase water removal.
Solution Approach 2:
The filter capsule assembly acts as a protective shell enclosing the Nafion tube. This protective enclosure shields the tube from mechanical damage, contamination, and environmental factors while allowing the tube to perform its humidification control function through its wall structure.
3Measurement precision
If separate filter apparatus and Nafion tube are used, then comprehensive water removal can be achieved, but device complexity increases and space requirements expand
Solution Approach 1:
The patent merges the filter capsule assembly and Nafion tube into a single integrated unit with a unified housing structure. This combination achieves comprehensive water removal (both liquid and gas-phase) while reducing device complexity compared to separate apparatus, as the two functional components share common mounting structures and connections.
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
The assembly provides enhanced humidity control and protection, ensuring accurate gas analysis by maintaining the integrity of the Nafion™ tube connection and enabling precise adjustment of humidity levels in gas mixtures.
Implementation Method 1
Nafion tubes are formed from a copolymer of tetrafluoroethylene (Teflon®) and another fluorocarbon chain having sulfonic acid groups secured to side chains. Among other properties imparted by the presence of the sulfonic acid groups, the fluorocarbon polymer readily absorbs water whether in a vapor or in a liquid phase.
Implementation Method 2
The first method is to use a filter apparatus to filter out aerosolized water droplets and water condensed from a vapor form in a gas sample with the use of hydrophobic filter media.
Implementation Method 3
filters and related devices are used to remove the water component from the samples to protect the samples from damage and/or malfunction
Data Source
AI summary
A disposable filter capsule assembly to secure a tube to the outer surface of the assembly. The filter capsule assembly includes a single or multiple-layer filter membrane secured in the assembly. Tube clips are formed on a surface of the filter capsule assembly to secure an attached tube. The tube clips can be formed with clip openings in stacked and tandem arrangements to secure multiple coils or multiple tubes, wires or similar elongate components.