CPAP Mask Vent Diffusion for Quiet CO2 Washout
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Solution Overview
Problem
Existing CPAP therapy systems suffer from noise and discomfort due to high-velocity gas exhaust through mask vents, which can lead to patient non-compliance and discomfort for both the wearer and bed partners.
Innovation Solution
The development of vent inserts and arrangements for CPAP masks that utilize cross-bars, grill components, and covers to create adjustable, porous vent orifices, as well as various configurations such as hourglass-shaped orifices, stainless steel meshes, and diffused vent systems to reduce noise and velocity of exhaled gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent is provided in the mask to discharge exhaled gas, then carbon dioxide build-up is prevented, but noise and air jetting increase causing discomfort
Solution Approach 1:
The vent is divided into multiple separate openings distributed across the mask frame rather than a single large opening. This segmentation reduces the velocity of exhaust gas through each individual opening, thereby reducing noise and air jetting while maintaining adequate carbon dioxide washout capability
Solution Approach 2:
The vent openings are strategically positioned and sized to create localized diffusion zones. The distributed arrangement of multiple small openings throughout the mask frame creates localized exhaust streams that dissipate more gradually, reducing the harmful effects of noise and air jetting in specific areas
2Productivity
If vent size is increased to improve gas washout, then carbon dioxide removal is enhanced, but noise and air jetting increase
Solution Approach 1:
Instead of using a single large vent opening, the invention employs multiple smaller openings that collectively provide adequate gas washout efficiency. The segmented structure allows for improved CO2 removal while each individual opening maintains lower gas velocity, reducing noise and air jetting effects
Solution Approach 2:
The vent openings are distributed across two-dimensional space on the mask frame rather than concentrated in a single location. This spatial distribution allows the system to achieve adequate total venting area for effective gas washout while maintaining low velocity at each opening, thereby reducing noise and air jetting
3Reliability
If bi-level gas delivery is used to treat sleep disordered breathing, then therapy effectiveness is improved, but noise increases due to turbulence
Solution Approach 1:
The multiple distributed vent openings segment the turbulent flow that occurs during bi-level gas delivery cycles. By dividing the exhaust flow into multiple smaller streams, the overall noise from gas acceleration and deceleration is reduced while maintaining effective therapy delivery
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
These designs significantly reduce noise and discomfort by diffusing exhaust gases, minimizing air jetting, and creating a more comfortable therapy experience for patients and bed partners.
Implementation Method 1
These designs significantly reduce noise and discomfort by diffusing exhaust gases, minimizing air jetting
Data Source
AI summary
A vent arrangement is provided to a mask or associated conduit to discharge exhaled gas from the mask to atmosphere. The vent arrangement is structured to diffuse the exhaust vent flow to produce less air jetting, thereby increasing the comfort of the patient and their bed partner. For example, the vent arrangement may include one or more grill components and/or media constructed and arranged to diffuse vent flow.