Mask Expiration Indicator Using Redox Dye Color Change
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing protective masks lack a visual indication system to notify users and others when the mask has reached the end of its service life, leading to potential health risks due to reduced filtration efficiency and increased discomfort.
Innovation Solution
A face protection device with a built-in visual indication system using a dye, such as methylene blue or indigo carmine, and a reducing compound like sodium dithionite, which changes color in response to oxygen exposure, indicating the end of the mask's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If masks are used for long periods of time, then productivity is improved, but reliability deteriorates due to reduced filtration efficiency
Solution Approach 1:
The patent applies preliminary action by incorporating an expiration indicator system into the mask that proactively signals the end of service life before filtration efficiency deteriorates. The indicator uses a chemical reaction (color change) to warn users in advance that the mask has reached its maximum usable duration, allowing them to replace it before protection is compromised.
Solution Approach 2:
The patent implements feedback through a visual indication system that provides real-time information about the mask's service life status. The color-changing indicator acts as a feedback mechanism, continuously monitoring and displaying the mask's degradation state, enabling users to make informed decisions about when to replace the mask to maintain reliable protection.
2Loss of time
If masks are used for long periods of time, then loss of time is reduced, but object-generated harmful factors increase due to increased discomfort and congestion
Solution Approach 1:
The expiration indicator provides feedback about the mask's service life status, enabling users to replace masks at optimal intervals. This prevents excessive use that leads to discomfort and congestion while avoiding premature replacement that would increase loss of time.
Solution Approach 2:
The indicator system performs preliminary action by warning users before the mask reaches a state of excessive discomfort or filtration degradation, allowing them to plan timely replacement without experiencing severe breathing difficulties or health risks.
3Device complexity
If no expiration indication system is provided, then device complexity is reduced, but loss of information occurs regarding service life status
Solution Approach 1:
The patent applies color changes as a simple yet effective information communication method. The indicator transitions from one color to another based on the mask's service life status, providing clear visual information about expiration without adding complex electronic or mechanical components to the mask structure.
Solution Approach 2:
The patent replaces complex mechanical or electronic monitoring systems with a simple chemical-based color change mechanism. This substitution maintains the essential function of service life indication while minimizing added complexity, using a chemical reaction (redox indicator) instead of batteries, circuits, or mechanical sensors.
4Reliability
If visual indication system is added to masks, then reliability is improved through better monitoring, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical or electronic monitoring systems with a simple chemical-based color change mechanism. This substitution maintains the essential function of service life indication while minimizing added complexity, using a chemical reaction (redox indicator) instead of batteries, circuits, or mechanical sensors.
Solution Approach 2:
The patent applies color changes as a simple yet effective information communication method. The indicator transitions from one color to another based on the mask's service life status, providing clear visual information about expiration without adding complex electronic or mechanical components to the mask structure.
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 provides a reliable and precise visual cue for users to replace the mask, ensuring continued protection against biological agents and reducing health risks associated with prolonged mask use.
Implementation Method 1
The dye is subjected to a chemical reduction process with a reducing compound capable of reducing the dye, for example, methylene blue. The reducing compound can be found in a medium at any pH, necessarily being in a basic medium when the dye comprises indigo for the reduction reaction. In these conditions, the dye changes from its characteristic color in the oxidized state to its colorless form in the reduced state
Implementation Method 2
The dye changes from its characteristic color in the oxidized state to its colorless form in the reduced state for methylene blue and to yellow color for indigo carmine, wherein the oxidized and reduced forms thereof are completely water soluble
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3c
AI summary
The present invention relates to a device for protection against biological agents with an expiration indicator system, specifically a face protection device, that visually indicates the end of the service life of the face protection device for protection against biological agents, hereinafter referred to as a mask.