Breathing System Humidifier Liquid Trap Design
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Solution Overview
Problem
Conventional in-line humidifiers used in breathing systems can experience liquid back-flow or splashing, which damages PAP machines and interferes with their operation, especially when the humidifier is turned upside-down or shaken.
Innovation Solution
An in-line humidifier with a liquid trap and a tiered configuration of chambers that includes a humidification chamber and a liquid trap, where the fluid outlets and inlets are designed to prevent liquid from flowing back into the PAP machine, even when the humidifier is moved or oriented in various ways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional humidifier is used in a breathing system, then the gas flow can be humidified, but liquid can back-flow or splash into the PAP machine when the humidifier is turned upside-down or shaken, causing damage and operational interference
Solution Approach 1:
The humidifier is divided into separate functional chambers: a humidification chamber for adding moisture to the gas flow, and a liquid trap chamber for capturing and containing any liquid that attempts to back-flow. This segmentation isolates the liquid containment function from the humidification function, preventing liquid from reaching the PAP machine while maintaining effective humidification.
Solution Approach 2:
The liquid trap chamber acts as an intermediary barrier between the humidification chamber and the PAP machine. It intercepts and contains liquid back-flow before the liquid can enter the PAP machine, serving as a protective mediator that absorbs the harmful effect while allowing the gas flow to pass through unaffected.
2Reliability
If the humidifier is designed with liquid prevention features, then liquid back-flow is reduced, but the device complexity increases due to additional chambers and fluid communication pathways
Solution Approach 1:
The liquid trap chamber and humidification chamber are merged into a single integrated humidifier assembly with defined fluid communication pathways. This combining of functions into one unit provides liquid protection without requiring entirely separate systems, maintaining a relatively simple overall structure while achieving the desired reliability improvement.
Data Source
AI summary
An in-line humidifier is disposed along the passageway of a breathing system. The humidifier includes a humidification chamber having a fluid inlet, a fluid outlet, and a reservoir. The humidifier includes a liquid trap which includes a chamber, a fluid inlet in communication with the liquid trap chamber, and a fluid outlet in communication with the liquid trap chamber. The liquid trap is constructed and arranged to discourage liquid from back-flowing from the humidifier to a source of gas.