Sterilization Indicator With Neutralizer For Rapid Hydrogen Peroxide Readout
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Solution Overview
Problem
Current sterilization indicators for hydrogen peroxide sterilization processes are slow and lack rapid-readout capabilities, and there is a need for self-contained biological indicators that can effectively monitor the effectiveness of hydrogen peroxide vapor phase sterilization procedures.
Innovation Solution
Development of a sterilization indicator that includes a container with a carrier and biological material, such as spores or active enzymes, which are correlated with the survival of test microorganisms, and a neutralizer to neutralize residual oxidizing sterilant, allowing for rapid detection of sterilization procedure effectiveness through detectable indications such as fluorescence, luminescence, or chromogenic signals within 8 hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sterilization indicators using spore growth are used, then accurate monitoring of sterilization effectiveness is achieved, but the readout time is slow (1-7 days)
Solution Approach 1:
The indicator is divided into separate functional components: an inner container holding the growth medium and an outer container holding the spores and neutralizer. This segmentation allows the growth medium to be protected from sterilant exposure while enabling rapid detection when the inner container is breached, resolving the contradiction between accuracy and speed by separating the protection function from the detection function.
Solution Approach 2:
The growth medium is pre-prepared and sealed in the inner container before sterilization, and the spores are pre-positioned on the carrier in the outer container. This preliminary preparation ensures that all components are ready for immediate reaction upon sterilization completion, enabling rapid readout while maintaining the accuracy of spore growth monitoring.
2Loss of time
If rapid-readout enzyme indicators are used, then quick results are obtained (a few hours), but the ability to monitor spore survival is reduced
Solution Approach 1:
The sterilization indicator is designed to perform multiple functions: it can detect sterilization effectiveness through spore growth monitoring (using the growth medium) and simultaneously provide rapid enzyme-based detection. The carrier can contain both spores for long-term accuracy verification and enzyme substrates for rapid initial assessment, making the indicator universal for both rapid and accurate monitoring needs.
3Speed
If a neutralizer is added to retain residual oxidizing sterilant, then rapid detection capability is improved, but the device complexity increases
Solution Approach 1:
The inner container containing the growth medium and neutralizer is nested within the outer container that holds the spores and carrier. This nested structure allows multiple functional components to be integrated in a compact arrangement, enabling rapid detection through the neutralizer while minimizing the increase in device complexity through space-efficient design.
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 provides a rapid and accurate method to assess the effectiveness of hydrogen peroxide sterilization procedures, ensuring the reliability and efficiency of sterilization processes by offering a rapid-readout hydrogen peroxide sterilization indicator that can detect sterilization failures within a short timeframe.
Implementation Method 1
a neutralizer to neutralize residual oxidizing sterilant
Implementation Method 2
detectable indications such as fluorescence, luminescence, or chromogenic signals
Implementation Method 3
detectable indications such as fluorescence, luminescence, or chromogenic signals
Implementation Method 4
detectable indications such as fluorescence, luminescence, or chromogenic signals
Data Source
AI summary
Sterilization indicators that include a neutralizer, such indicators useful for testing the effectiveness of a sterilization procedure by measuring the activity of an active enzyme whose activity is correlated with the survival of microorganisms.