Sealed Bedding Vent Filter for Infection Control and Airflow
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Solution Overview
Problem
Current infection control bedding products, such as pillows and mattresses, face challenges with 'strikethrough' where contaminants penetrate, leading to cross-infection risks, and lack adequate ventilation, causing discomfort and material degradation.
Innovation Solution
A hermetically sealed bedding product with a vent system featuring a filter membrane that combines mechanical strength with air permeability, using an oleophobic expanded polytetrafluoroethylene (PTFE) filter membrane and a spun non-woven polypropylene strengthening layer, ensuring liquid resistance and efficient filtration of particles down to 0.2 microns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hermetically sealed cover is used to prevent liquid penetration and cross-infection, then infection control is improved, but ventilation is insufficient causing discomfort and material degradation
Solution Approach 1:
The patent applies porous PTFE (polytetrafluoroethylene) membrane material in the vent filter assembly. This porous material allows air molecules to pass through while blocking larger particles and liquids, thereby providing ventilation to the hermetically sealed bedding product without compromising infection control. The porous structure enables gas permeability while maintaining liquid barrier properties.
Solution Approach 2:
The vent filter assembly uses a composite structure combining PTFE membrane material with a strengthening layer. This composite material configuration allows the filter to simultaneously achieve air permeability through the porous PTFE layer while the strengthening layer provides mechanical durability. The composite approach resolves the contradiction by integrating materials with complementary properties.
2Ease of operation
If a vent opening is provided to improve ventilation, then air flow is improved, but liquid penetration and bacterial contamination risk increase
Solution Approach 1:
The porous PTFE membrane in the vent filter allows selective passage of air molecules while blocking liquids and bacteria. The pore size is engineered to permit gas diffusion while excluding larger contaminants, thus providing ventilation without compromising protection against harmful factors.
Solution Approach 2:
The vent filter assembly acts as an intermediary component between the internal pillow environment and external atmosphere. It mediates the exchange of gases while filtering out harmful substances, allowing ventilation to occur without direct exposure to liquids and bacteria.
3Object-affected harmful factors
If conventional filter materials are used in vent openings, then filtration is provided, but mechanical strength is insufficient leading to product failure
Solution Approach 1:
The vent filter assembly combines PTFE membrane material with a strengthening layer to create a composite structure. The PTFE layer provides filtration capabilities while the strengthening layer adds mechanical durability. This composite construction allows the filter to withstand operational stresses without compromising filtration performance.
Solution Approach 2:
The strengthening layer is strategically positioned in the vent filter assembly to provide mechanical support where needed. This localized reinforcement maintains filtration properties in the PTFE layer while adding strength only where structural integrity is required, optimizing both filtration and mechanical properties.
4Reliability
If welding seams are used to create hermetic seals, then liquid tightness is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent uses a continuous polyurethane coating film applied to the bedding product cover to achieve hermetic sealing. This thin film approach provides liquid barrier properties without requiring complex welded seam constructions. The coating forms a seamless barrier that is both effective and simpler to manufacture.
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 solution provides effective ventilation while preventing liquid ingress and bacterial contamination, enhancing user comfort and product durability, and is suitable for mass production.
Implementation Method 1
a filter medium including a filter membrane for the removal of particles of microbial size
Implementation Method 2
an oleophobic expanded polytetrafluoroethylene (PTFE) filter membrane
Implementation Method 3
a spun non-woven polypropylene strengthening layer, whereby the filter medium allows air flow therethrough
Implementation Method 4
a hermetically sealed infection control bedding product
Implementation Method 5
providing liquid resistance
Data Source
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AI summary
A hermetically sealed infection control bedding product such as a pillow, duvet, mattress, cushion or such like having a sealed cover and having a resiliently deformable filling material, comprising a vent means in the cover, characterised in that the vent means comprises a filter medium including a filter membrane for the removal of particles of microbial size and wherein the filter medium also comprises a strengthening layer of material for providing mechanical strength to the filter medium whereby the filter medium allows air flow therethrough but is substantially impermeable to liquid while maintaining a barrier to particles of microbial size.