EtO Sterilization Indicator Label Using Color-Changing Dyes
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Solution Overview
Problem
Current methods for monitoring ethylene oxide (EtO) sterilization processes are costly and risky, involving biological indicators that require laboratory testing and can lead to contamination risks, while chemical indicators may not be compatible with cellulose-based papers and interfere with DNA amplification methods.
Innovation Solution
Development of a chemical indicator label comprising dyes like Bromophenol Red, Bromocresol Purple, and Chlorophenol Red, which change color upon EtO exposure, compatible with cellulose-based papers and non-interfering with DNA amplification, allowing for direct visual confirmation of EtO exposure and nucleic acid decontamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biological indicators are used to monitor EtO sterilization, then sterilization effectiveness can be confirmed, but costs increase and contamination risks arise
Solution Approach 1:
The patent employs disposable chemical indicator strips that change color to indicate EtO exposure and sterilization completion. These single-use indicators eliminate the need for reusable biological indicators that require laboratory processing, thereby reducing contamination risks while maintaining reliability through visual color change confirmation.
Solution Approach 2:
The patent replaces the biological indicator system (which requires mechanical handling, laboratory incubation, and manual reading) with a chemical indicator system that provides immediate visual feedback through color change. This substitution eliminates the mechanical handling steps that create contamination opportunities while maintaining sterilization verification capability.
2Ease of manufacture
If chemical indicators are used for EtO monitoring, then costs are reduced, but compatibility with cellulose-based papers and DNA amplification may be compromised
Solution Approach 1:
The patent applies specific chemical dyes (such as bromophenol blue, methyl red, or their mixtures) to localized indicator strips rather than treating the entire packaging material. This localized application ensures that the chemical indicators are placed only where needed for monitoring, preventing interference with cellulose-based paper properties and DNA amplification processes in other areas of the packaging.
Solution Approach 2:
The patent uses paper or plastic strips as intermediary carriers for the chemical indicators. These intermediaries separate the chemical dye from direct contact with the product packaging and DNA samples, preventing interference with DNA amplification while still providing visual indication of EtO exposure. The intermediary substrate allows the indicator to function without compromising the integrity of the packaged items.
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 indicator label provides a cost-effective and safer means to confirm successful EtO exposure and nucleic acid decontamination, facilitating faster quality control processes without interfering with DNA amplification methods, ensuring sterility and DNA-free status.
Implementation Method 1
an indicator for confirming successful ethylene oxide (EtO) exposure wherein the indicator comprises a solid support treated with a dye
Data Source
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AI summary
The present invention provides an indicator useful in confirming successful sterilisation and/or nucleic acid decontamination by ethylene oxide (EtO) treatment. The invention also providesa label comprising said indicator and methods for use of the indicator and label in a method of EtO treatment.