Sterilization Chemical Indicator With Segmented Barrier
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Solution Overview
Problem
Current sterilization indicators face challenges in accurately monitoring sterilization processes using gaseous sterilants like hydrogen peroxide due to diffusion issues and the high oxidizing power of the sterilant, which can cause premature color change, making it difficult to assess critical sterilization parameters, especially for complex medical devices and hard-to-reach surfaces.
Innovation Solution
The development of a chemical indicator with a fluid pathway and chamber design, where the first and second sheets are substantially impermeable to sterilants, allowing controlled exposure of the chemical-indicating composition to the sterilant, preventing premature reactions and ensuring accurate monitoring of sterilization parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If gaseous sterilants like hydrogen peroxide are used for sterilization monitoring, then temperature-sensitive devices can be sterilized at lower temperatures, but the sterilant penetrates and diffuses slowly out of indicator materials causing continued color change after sterilization is complete
Solution Approach 1:
The indicator is segmented into multiple functional layers: a sterilant-permeable layer that allows controlled diffusion of hydrogen peroxide to the chemical indicator, and a sterilant-impermeable layer that prevents further penetration and slow outgassing. This segmentation resolves the contradiction by enabling temperature-sensitive device sterilization at lower temperatures while maintaining monitoring accuracy through controlled sterilant release.
2Reliability
If hydrogen peroxide is used as sterilant, then effective sterilization can be achieved, but the high oxidizing power causes the indicator color to change too quickly to monitor critical parameters
Solution Approach 1:
A sterilant-permeable intermediary layer is introduced between the hydrogen peroxide sterilant and the chemical indicator. This intermediary layer allows the sterilant to reach the indicator for effective sterilization while modulating the rate of interaction to prevent excessively rapid color change, thereby enabling monitoring of critical sterilization parameters.
3Productivity
If sterilant is allowed to contact the chemical-indicating composition directly, then rapid color change occurs for immediate indication, but it becomes difficult to assess exposure time and concentration parameters
Solution Approach 1:
The physical state and permeability parameters of the indicator structure are changed by introducing layered materials with different sterilant permeability. The sterilant-permeable layer allows controlled diffusion that maintains indication response while the sterilant-impermeable layer modulates the release rate to enable assessment of exposure time and concentration parameters.
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
This design enables precise monitoring of sterilization processes by preventing sterilant penetration through the sheets, allowing only controlled exposure to the chemical-indicating composition, thereby providing accurate and reliable indicators of sterilization completion and parameters, even for temperature-sensitive devices.
Implementation Method 1
the tendency of those gasses to penetrate and then slowly diffuse out of the materials of the indicator and the medical device being sterilized
Implementation Method 2
the high oxidizing power of hydrogen peroxide, which may cause the color of the indicator to change too quickly
Data Source
AI summary
The present disclosure relates generally to chemical indicators. In particular, the chemical indicators are useful for monitoring sterilization processes. The chemical indicator includes a fluid pathway and a chamber comprises a chemical-indicating composition.