Woven and Knitted Diffuser Pads for Respiratory Vent Noise
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Solution Overview
Problem
Existing diffuser pads for CPAP systems, made of non-woven polyester fibers, suffer from poor bonding, making them difficult to clean and prone to dirt accumulation, leading to noise and airflow issues.
Innovation Solution
The use of woven or knitted diffuser pads with improved thread interlocking and surface textures, along with removable and replaceable diffuser elements, enhances durability and airflow management while reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If non-woven polyester fiber pads are used for diffusing vent gas flow, then noise reduction is achieved, but cleaning difficulty increases and dirt accumulation occurs
Solution Approach 1:
The patent changes the fundamental material parameter from non-woven to woven fabric construction. This parameter change transforms the material structure into interlaced threads that create larger gaps between fibers, allowing easy passage of cleaning fluids while maintaining the diffuser function of scattering gas flow to reduce noise.
Solution Approach 2:
The woven fabric inherently provides a porous structure with interconnected gaps between threads. This porous configuration allows cleaning solutions to penetrate through the material easily, enabling simple rinsing and drying without requiring complex disassembly or special cleaning procedures, thus resolving the cleaning difficulty issue.
2Reliability
If non-woven diffuser pads are used, then initial diffusion performance is achieved, but durability deteriorates due to poor bonding between strands
Solution Approach 1:
The patent changes the construction parameter from non-woven to woven fabric, where threads are interlaced in a systematic pattern. This structural parameter change provides inherent mechanical strength through the interlacing action, eliminating the need for chemical bonding while maintaining the diffusion performance through the fabric's porous structure.
3Illumination intensity
If white polyester material is used for diffuser pads, then initial appearance is achieved, but visual cleanliness deteriorates quickly due to dirt trapping
Solution Approach 1:
The patent changes the surface parameter from non-woven loops to woven fabric surface with larger inter-thread gaps. This parameter change prevents dirt particles from becoming trapped within the material structure, allowing dirt to remain on the surface where it can be easily rinsed away, thus maintaining visual cleanliness.
4Object-affected harmful factors
If integrated diffuser pads are used in vent assemblies, then noise reduction is achieved, but maintenance difficulty increases
Solution Approach 1:
The patent applies segmentation by making the diffuser pad a separate, removable component rather than an integrated permanent part of the vent assembly. This allows the diffuser pad to be easily detached for cleaning or replacement without disassembling the entire vent assembly, significantly improving maintenance ease while retaining the noise reduction function.
Solution Approach 2:
The simplified woven fabric construction and removable design enable the diffuser pad to be treated as a low-cost, replaceable component. When soiled or degraded, the entire pad can be quickly removed and replaced without affecting the permanent vent assembly structure, reducing maintenance complexity.
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 woven or knitted diffuser pads provide enhanced durability, easier cleaning, and improved airflow control, reducing noise and maintaining hygiene.
Implementation Method 1
a diffuser pad has at least a portion formed of a knit or woven material... A woven or knitted diffuser pad can be arranged and configured to transmit a flow of between 16-22 L/min at 4 cm H2O, a flow of between 32-42 L/min at 13 cm H2O and a flow of between 43-59 L/min at 25 cm H2O
Data Source
AI summary
A diffuser element for use over a vent opening of a breathing assistance apparatus. In some configurations, the diffuser element is formed by knitting or weaving one or more threads together into an interlocking pattern. In some configurations, the diffuser pad has a first surface and an opposing second surface and at least the first surface includes a surface texture. Arrangements for coupling the diffuser element to a structure that defines or carries the vent are also disclosed.