CPAP Valve and Venturi Low-Pressure CO2 Venting
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Solution Overview
Problem
Current CPAP systems fail to vent exhaled CO2 effectively when the positive pressure supplied falls below a threshold of approximately 3-5 cm H2O, leading to a buildup of gases within the mask, which can be harmful to the patient.
Innovation Solution
A respiratory delivery system with a valve and conduit arrangement that automatically adjusts to allow exhaled gas ventilation at low pressures, using a two-way valve to direct airflow and a venturi opening to facilitate gas exit, preventing CO2 buildup by ensuring continuous venting regardless of pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predetermined low pressure of greater than approximately 3-5 cm H2O is used to vent exhaled gas, then exhaled gas can be vented through the leak port, but when positive pressure falls below this value, venting ceases and CO2 builds up
Solution Approach 1:
The patent introduces a secondary venting pathway as an intermediary solution. When the primary leak port fails to vent due to low pressure, the secondary conduit with valve provides an alternative route for exhaled gas to escape, preventing CO2 buildup while maintaining system reliability across all pressure conditions
Solution Approach 2:
The system dynamically changes the venting parameter by switching between two different venting pathways based on pressure conditions. The valve responds to pressure changes by opening or closing, thereby changing which conduit is active for venting, ensuring effective venting across the full range of operating pressures
2Object-affected harmful factors
If a valve and dual conduit system is added to enable venting at low pressures, then CO2 buildup is prevented, but device complexity increases
Solution Approach 1:
The valve in the system is designed to operate automatically based on pressure differential without requiring external control or manual intervention. The valve self-regulates the switching between venting pathways in response to changing pressure conditions, eliminating the need for complex control systems while maintaining effective CO2 prevention
Solution Approach 2:
The patent combines the primary and secondary venting pathways into a unified system where both conduits serve the same ultimate function of venting exhaled gas. The valve integrates the switching function within the existing conduit structure, merging multiple functions into a compact arrangement that minimizes overall system 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 system effectively vents exhaled gases at low pressures, preventing CO2 buildup and ensuring patient safety by maintaining ventilation without manual intervention, applicable for treating sleep apnea and other respiratory conditions.
Implementation Method 1
a venturi opening entraining gas from the third end to the ambient environment
Data Source
AI summary
A system comprises a respiratory delivery arrangement adapted to cover at least one respiratory orifice of a patient. The system also comprises a first conduit having a first end and a second end, the second end connected to the respiratory delivery arrangement. A positive pressure is provided to the respiratory orifice via the first conduit and a second conduit having a third end and a fourth end, the fourth end connected to the respiratory delivery arrangement. An exhaled gas is extracted from the respiratory orifice by one or both of a valve configured to redirect flow through the respiratory delivery arrangement and a venturi opening.