Pressure-Responsive CPAP Valve Venting to Prevent CO2 Rebreathing
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Solution Overview
Problem
Existing CPAP therapy systems face issues with CO2 rebreathing due to inadequate exhalation gas venting, particularly under low pressure conditions, leading to discomfort and potential health risks, and traditional valves cause noise and displacement of the mask due to their design.
Innovation Solution
The development of valves with internal members that transition between open and closed configurations based on pressure thresholds, allowing for controlled exhalation gas venting and maintaining a constant gas flow rate, reducing noise and mask displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional valve designs are used, then gas flow control is achieved, but mask displacement and noise occur
Solution Approach 1:
The invention extracts the noise-generating and mask-displacing elements from the gas flow control function. The internal member provides silent, displacement-free operation by moving within the valve body rather than requiring external mechanical components that contact the mask or generate noise.
Solution Approach 2:
The internal member acts as an intermediary between the pressure differential and the gas flow. It translates pressure changes into controlled opening/closing actions without requiring external actuators, mechanical linkages, or components that would generate noise or displacement, thus mediating the control function cleanly.
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 effectively mitigates CO2 rebreathing, reduces noise, and maintains a consistent gas flow, enhancing patient comfort and therapy efficacy by ensuring efficient gas exchange and minimizing mask displacement.
Implementation Method 1
the internal member having a closed configuration that occludes the one or more ports when a gas pressure in the valve is above a threshold pressure and an open configuration that allows gas to pass from the passageway to the environment when the gas pressure in the valve is at or below a threshold pressure
Data Source
AI summary
A valve with an internal member is disclosed which allows exhaled carbon dioxide to escape from a breathing circuit when the circuit gas pressure drops below a threshold pressure. The valve operates by occluding one or more ports under a relatively high pressure and opening the one or more ports under a relatively low pressure. The internal member is attached to the body of the valve at two or more locations on the internal member. The internal member moves in a direction perpendicular to the gas flow through the valve.