Humidification Chamber Valve with Dual Float Safety Mechanism

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Solution Overview

Problem

Conventional humidification chambers for breathing circuits face issues with complex construction and increased manufacturing costs due to secondary float actuator mechanisms, which are required to prevent water overflow in case of primary float failure, leading to potential harm to patients if water enters the breathing circuit.

Innovation Solution

A simplified valve mechanism using a secondary float that engages the primary float to force it into a closed configuration when the liquid level is too high, reducing manufacturing complexity and costs by eliminating the need for a separate actuating member, with the secondary float having greater buoyancy to overcome primary float failures such as foreign object obstruction or reduced buoyancy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a secondary float actuator is added to close the liquid inlet valve when the primary float fails, then patient safety is improved by preventing water overflow, but device complexity and manufacturing costs increase significantly

Engineering Contradiction:

Improvepatient safetyVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the secondary float actuator with the primary float structure, allowing the secondary float to engage directly with the primary float's actuating member rather than requiring a completely separate valve mechanism. This merging approach maintains the safety function while reducing overall device complexity and manufacturing costs.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The actuating member serves multiple functions: it responds to the primary float during normal operation and also receives engagement from the secondary float when needed. This multi-functionality eliminates the need for separate actuating mechanisms, thereby reducing device complexity while maintaining reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a secondary float actuator is added to close the liquid inlet valve when the primary float fails, then patient safety is improved by preventing water overflow, but manufacturing costs increase significantly

Engineering Contradiction:

Improvepatient safetyVSAvoidmanufacturing costs

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If the secondary float engages the primary float directly to impart force, then the valve construction is simplified and manufacturing costs are reduced, but the secondary float must have greater buoyancy to overcome primary float failures

Engineering Contradiction:

Improvevalve constructionVSAvoidbuoyancy force

Core Design Contradiction:

Device complexityVSForce

Solution Approach 1:

The patent specifies that the secondary float must have greater buoyancy than the primary float to ensure it can overcome failures of the primary float mechanism. This parameter change in buoyancy force enables the simplified direct engagement design to work reliably, as the secondary float's enhanced buoyancy provides sufficient force to move the primary float against resistance from foreign objects or mechanical failures.

Inventive Principle:

Principle #35Parameter changes

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 ensures reliable operation and reduced manufacturing costs by using a secondary float to maintain the liquid level within a safe range, preventing water overflow into the breathing circuit and ensuring patient safety without the complexity of additional actuating members.

Implementation Method 1

the secondary float having greater buoyancy to overcome primary float failures

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Data Source

PatentEP2056910B1Improvements relating to humidification chambers

Publication Date: 2013.07.24 INTERSURGIGAL AG

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AI summary

A valve for controlling the level of liquid within a chamber (10) is disclosed. The valve comprises a liquid inlet (30) and a primary float (40) that is movable in response to a change in the level of liquid (20) within the chamber (10) between an open configuration in which liquid (20) is able to flow through the liquid inlet (30) into the chamber (10) when the liquid (20) within the chamber (10) is below a predetermined acceptable level, and a closed configuration in which liquid (20) is prevented from flowing through the liquid inlet (30) into the chamber (10) when the liquid within the chamber (10) is at or above the predetermined acceptable level. The valve also includes a secondary float (50) that is movable in response to an increase in the level of liquid within the chamber (10) above the predetermined acceptable level from an inoperative configuration to an operative configuration in which the secondary float (50) imparts a force upon the primary float (40) that urges the primary float (40) towards its closed configuration.