Ventilator Expiratory Filter With Pre-Filter And Condensate Compartment
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Solution Overview
Problem
Existing filters in ventilator systems face issues with condensation and medicament droplets, leading to increased resistance and clogging, particularly in single and dual heat systems, as well as when nebulizers are used, due to inadequate design in handling condensate and medicament droplets.
Innovation Solution
A filter with a housing and a pre-filter member that collects medicament droplets and a dividing element forming two compartments to keep condensate away from the main filter element, allowing air to pass through while preventing clogging and maintaining filter functionality in both single and dual heat systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is arranged in the expiratory branch to prevent contamination, then the ventilator is protected from viruses and bacteria, but condensate from exhaled air condenses on the filter material causing wetting and increased resistance
Solution Approach 1:
The filter device is divided into separate functional zones: a hydrophobic filter element for pathogen filtration and a hydrophilic condensate collection chamber. This segmentation allows condensate to be directed away from the filter material into a dedicated collection area, preventing wetting while maintaining filtration effectiveness.
Solution Approach 2:
A hydrophilic coating or intermediate layer is introduced between the condensate and the hydrophobic filter element. This intermediary layer attracts and collects condensate through capillary action, preventing it from reaching and wetting the filter material that needs to remain dry for effective pathogen blocking.
2Reliability
If a pre-filter with absorbing material is used to catch medicament droplets, then droplet collection is improved, but the design does not optimally prevent condensate contact with the filter element
Solution Approach 1:
Different regions of the filter device are assigned different functional properties: the pre-filter area uses absorbing material for droplet capture, while the main filter element maintains hydrophobicity for pathogen blocking, and the lower region provides a hydrophilic condensate collection zone. This local differentiation allows each zone to perform its specific function without interference from condensate.
Solution Approach 2:
The filter device incorporates a vertical dimension for condensate management by extending the housing downward to create a gravity-driven condensate collection chamber. This dimensional addition allows condensate to be collected in a separate space below the filter elements, preventing contact while maintaining effective droplet and pathogen filtration in the upper regions.
3Productivity
If the filter allows gaseous vapour with tiny droplets to pass through, then respiratory flow is maintained, but condensate forms on the patient side of the filter and reduces filter function
Solution Approach 1:
The filter device performs preliminary condensate collection in a dedicated hydrophilic chamber before air reaches the hydrophobic filter element. By collecting condensate in advance in a separate zone, the system prevents subsequent wetting of the filter material that would compromise its ability to block pathogens while maintaining respiratory flow.
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 filter effectively manages condensate and medicament droplets, reducing pressure drops and extending filter life, making it suitable for various ventilator systems and nebulizer use without the need for specialized filters.
Implementation Method 1
a pre-filter member arranged before the main filter element as seen in the flow direction and comprising an air permeable material capable of collecting medicament droplets in the air stream through said main filter element
Implementation Method 2
The incoming air is thus forced to deflect around the surface while the heavier medicament droplets get caught on the absorbing material
Implementation Method 3
The exhaled air contains quite a lot of vapour. In a single heat system this vapour will condensate in the expiratory branch
Implementation Method 4
the vapour has passed the filter element, it will condense because the expiratory branch on this side of the filter is not heated
Implementation Method 5
a main filter element and a pre-filter member arranged before the main filter element
Data Source
AI summary
Filter to be used in the expiratory branch of a ventilator, comprising a housing arranged with an inlet passage and an outlet passage, a main filter element, further comprising a pre-filter member arranged before said main filter element as seen in the flow direction and comprising an air permeable, material capable of collecting medicament droplets in the air stream through said main filter element.