Humidifier Back-Flow Prevention Valve for Pressure Support Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional humidification systems in pressure support systems fail to effectively prevent back-flow of fluid from the humidifier into the pressure support device, particularly due to condensation and tilting, which can damage the device and lead to bacterial growth.
Innovation Solution
A humidifier with a valve arrangement that moves between open and closed positions based on the orientation of the system, preventing fluid back-flow by blocking the inlet when the pressure support device is tilted or if the fluid level is high, ensuring that gas flows only when the system is properly aligned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a patient circuit is provided between the humidification chamber and pressure support device to prevent back-flow, then device damage is prevented, but the system complexity increases
Solution Approach 1:
A one-way valve is introduced as an intermediary component between the humidification chamber and pressure support device. The valve allows gas to flow from the pressure support device to the humidifier while preventing fluid back-flow, thus protecting the device without requiring a complex patient circuit configuration
Solution Approach 2:
The back-flow prevention function is extracted from the patient circuit and implemented as a dedicated valve component within the humidifier assembly. This separates the protection function from the gas delivery function, simplifying the overall system architecture
2Device complexity
If the humidification chamber is rigidly coupled directly to the pressure support device, then the system structure is simplified, but back-flow prevention becomes less effective
Solution Approach 1:
A one-way valve is positioned at the inlet of the humidification chamber to act as an intermediary that maintains direct coupling between devices while preventing back-flow. The valve enables structural simplicity without compromising protection reliability
Solution Approach 2:
The one-way valve is positioned upstream at the inlet to prevent back-flow before it can reach the pressure support device. This preliminary blocking action occurs at the first opportunity, maintaining effectiveness even with direct coupling
3Ease of manufacture
If the valve is positioned downstream in the fluid chamber, then manufacturing is simplified, but back-flow prevention effectiveness is reduced
Solution Approach 1:
The one-way valve is positioned upstream at the inlet to block back-flow at the earliest possible point. This preliminary action prevents fluid from traveling far into the system, maintaining high effectiveness while the manufacturing process remains feasible
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 prevents fluid back-flow into the pressure support device, reducing the risk of damage and bacterial growth, while allowing uninterrupted gas flow to the patient during normal operation.
Implementation Method 1
A valve is positioned in the inlet and upstream of the fluid chamber. The valve is movable between an open position in which the inlet is substantially unblocked and a closed position in which the inlet is substantially blocked.
Implementation Method 2
pressure support device 10 having an outlet port 12 supplies pressurized gas to a patient circuit 13
Data Source
AI summary
A humidifier for use with a pressure support system. The humidifier includes a body having an inlet, a fluid holding chamber, and an outlet. The inlet is positioned upstream and in fluid communication with the fluid holding chamber. The outlet is positioned downstream of and in fluid communication with the fluid holding chamber. A back-flow preventing valve is positioned upstream of the fluid chamber. The back-flow preventing valve is movable between an open position, in which the inlet is unblocked, and a closed position in which the inlet is blocked. In the closed position, the back-flow preventing valve prevents fluid, fluid vapor, or both from entering the pressure support via the inlet to the humidifier.