Exhalation Filtration Device with Aerosol Separator
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Solution Overview
Problem
Current filtration devices used with nebulizers are bulky, prone to saturation, lack bio-fluid collection capabilities, and do not provide a non-rebreather option, posing risks to healthcare workers and patients during aerosolized medication administration, especially in COVID-19 scenarios.
Innovation Solution
A filtration device comprising a flexible bag with an inlet port for nebulizer exhaust tubes, a filter element, and an optional deflector for aerosol extraction and moisture elimination, designed to fit onto nebulizers or respiratory masks, featuring a collection reservoir for aerosols and particles, which separates aerosols before reaching the filter to keep it dry and reduces air resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter element is used to capture aerosols, then protection against aerosolized viral particles is improved, but the filter becomes saturated and loses effectiveness over time
Solution Approach 1:
The device divides the aerosol capture function into two separate components: a hydrophobic filter element for viral particle filtration and a hydrophilic collection reservoir for aerosol condensation and collection. This segmentation allows each component to perform its specific function optimally without interfering with the other, preventing the filter from saturation while maintaining continuous protection.
Solution Approach 2:
The collection reservoir acts as an intermediary between the aerosol stream and the filter element. It condenses and collects aerosols before they reach the filter, reducing the filter's workload and preventing saturation. This intermediary component extends the filter's service life while maintaining protection effectiveness.
2Volume of moving object
If the filtration device is made compact to reduce bulk, then comfort and portability are improved, but material usage is reduced which may compromise filtration capability
Solution Approach 1:
The device employs thin-film hydrophobic and hydrophilic materials that provide effective filtration and aerosol separation with minimal thickness. The flexible membrane structure achieves compact device volume while maintaining sufficient filtration surface area and material effectiveness through high-quality thin-film construction.
3Reliability
If aerosols are not separated before filtration, then the filter captures all particles, but air resistance increases and medication delivery is reduced
Solution Approach 1:
The hydrophilic collection reservoir performs preliminary action by condensing and collecting aerosols before they reach the hydrophobic filter element. This pre-separation reduces the load on the filter, maintaining lower air resistance and ensuring continuous effective medication delivery while still capturing particles.
Solution Approach 2:
The collection reservoir serves as an intermediary that conditions the aerosol stream by removing excess moisture and aerosols before filtration. This protects the filter from clogging and maintains optimal airflow characteristics for medication delivery.
4Productivity
If a non-rebreather function is added to maximize medication delivery, then treatment effectiveness is improved, but device complexity increases
Solution Approach 1:
The device incorporates a dynamic valve mechanism that automatically opens or closes based on the patient's breathing phase. During inhalation, the valve opens to allow fresh air intake; during exhalation, it closes to prevent rebreathing of exhaled air. This dynamic control maximizes medication delivery while adding minimal structural complexity through a simple yet effective valve design.
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 device effectively captures and retains bio-fluids, reduces air resistance during exhalation, provides a non-rebreather function to maximize medication delivery, is less bulky and comfortable to hold, and is more environmentally friendly due to reduced material usage.
Implementation Method 1
a filter element (FE) disposed on the outlet port
Implementation Method 2
A bottom portion of the bag (B) may comprise a collection reservoir (R) for collecting aerosols and particles exhaled by a patient
Data Source
AI summary
A filtration device (FD) having a front plastic sheet (PS), a sponge element (SE), and a filter element (FE) may be secured to a mask (M) with a “stickie” interface (AL, FS; FIGS. 5 and 6), or with a rigid mechanical interface (FIGS. 7 and 8) which may include a rigid support (RS) (FIG. 9). The rigid support (RS) may have a recess for receiving the sponge element (SE) and avoiding it being compressed when the filter element (FE) is disposed between to the outlet side of the rigid support (RS) and the filter element (FE). The sponge element (SE) may be provided with a cutout (CO; FIG. 10) for accommodating the flap of a non-rebreather mask (M). A protective cover (PC; FIG. 11) having perforations (PF) and a second sponge element (SE2) may be provided on the outlet side of the filter element (FE). Methods of use.