Humidity Indicator Device for Respiratory Circuit Monitoring
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Solution Overview
Problem
Current medical equipment for humidification in anesthesia and intensive care units lacks intuitive means for users to verify the relative humidity levels, relying on manufacturer tests and visual indicators like water drops, which are not immediate or comprehensive.
Innovation Solution
A device with a transparent housing and a semi-permeable membrane for housing a humidity indicator strip, using copper or cobalt salts that change color with humidity levels, allowing direct visualization of humidity without contaminating patients and enabling comparison of humidification efficiency across products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manufacturer tests and instruction manuals are used to declare humidity values, then product validation is performed, but users cannot immediately verify or intuitively assess the humidity values in real-time
Solution Approach 1:
The patent employs a humidity indicator element containing copper salts or cobalt salts that undergo color changes in response to different humidity levels. This visual colorimetric indication allows users to immediately and intuitively verify humidity values without requiring complex measurement instruments or relying solely on manufacturer declarations, directly resolving the contradiction between measurement precision and ease of operation.
2Ease of operation
If water drops are used to indicate saturation, then saturation is visually indicated, but this method is not immediate or comprehensive for assessing humidity levels
Solution Approach 1:
The patent replaces the limited water drop saturation indicator with a humidity indicator element that exhibits progressive color changes across the full humidity range. This provides both immediate visual control and comprehensive humidity level assessment, simultaneously improving ease of operation and measurement precision.
3Measurement precision
If humidity indicator elements containing copper or cobalt salts are used, then humidity levels can be visually indicated, but there is risk of salt contamination to the patient
Solution Approach 1:
The patent introduces a semi-permeable membrane as an intermediary barrier between the humidity indicator element containing copper or cobalt salts and the patient's respiratory pathway. This membrane allows water vapor to pass through for humidity indication while preventing salt particles from contaminating the patient, thus maintaining measurement precision while eliminating the harmful contamination effect.
4Object-affected harmful factors
If a semi-permeable membrane is used to prevent salt contamination, then patient safety is improved, but the device structure becomes more complex
Solution Approach 1:
The patent employs a thin semi-permeable membrane that can be easily integrated into the existing device structure. This flexible film provides the necessary protection against salt contamination while adding minimal structural complexity, allowing for straightforward manufacturing and assembly.
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
Enables immediate and intuitive monitoring of humidity levels within medical devices, ensuring correct humidification conditions for patients without complex instruments and preventing salt contamination, thus verifying manufacturer claims and monitoring patient conditions effectively.
Implementation Method 1
copper or cobalt salts that change color with humidity levels
Implementation Method 2
a membrane permeable to the humidified gas passing through the equipment
Data Source
AI summary
A device for detecting the relative humidity in a respiratory circuit is provided which includes a housing closed towards the outside by a transparent element, and towards the inside by a membrane permeable to the humidified gas passing through the equipment to which the device is applied and wherein the housing includes a humidity indicator element.