Wax-Enveloped Biological Indicator for Rapid Sterilization
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Solution Overview
Problem
Conventional sterilization processes, particularly steam sterilization, face challenges in rapidly assessing the effectiveness of sterilization cycles due to the need for lengthy incubation periods to detect viable microorganisms, which can delay validation of sterilization efficacy.
Innovation Solution
A self-contained biological indicator with test microorganisms enveloped in a wax composition is introduced, allowing for rapid detection of germination and outgrowth by incorporating a wax composition with a melting point between 78° C. and 120° C., enabling both rapid enzyme activity detection and traditional growth-based detection methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional biological indicators are used to assess sterilization effectiveness, then accurate detection of viable microorganisms can be achieved, but the incubation period requires 24 hours or more which delays validation
Solution Approach 1:
The patent employs color-changing indicators that transition from yellow to red when exposed to steam sterilization conditions, providing immediate visual detection of sterilization effectiveness without requiring lengthy incubation periods. This color change mechanism enables rapid assessment while maintaining detection accuracy.
Solution Approach 2:
The invention replaces the traditional biological incubation system with a chemical indicator system that undergoes physical changes (color transformation) in response to sterilization conditions. This substitution eliminates the need for time-consuming microbial growth observation while preserving the ability to accurately assess sterilization efficacy.
2Measurement precision
If different biological indicators are used for different sterilization temperatures, then accurate assessment for each temperature condition can be achieved, but the device complexity increases requiring multiple indicators
Solution Approach 1:
The patent develops a universal biological indicator that can accurately assess sterilization effectiveness across a broad temperature range (121°C to 135°C) using a single indicator type. The indicator's design incorporates temperature-resistant microorganisms and a stable color-changing mechanism that functions reliably at all specified temperatures, eliminating the need for multiple temperature-specific indicators.
Solution Approach 2:
The invention utilizes microorganisms with altered physiological parameters (heat resistance) that enable the indicator to function across varying temperature conditions. By selecting microorganisms and indicator materials with appropriate thermal stability parameters, the system achieves universal applicability while maintaining precision across the entire sterilization temperature range.
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 solution allows for the rapid assessment of steam sterilization processes, reducing the time required to determine sterilization efficacy and providing a universal indicator suitable for various steam sterilization conditions, eliminating the need for multiple indicators for different temperatures.
Implementation Method 1
test microorganisms enveloped by a wax composition that increases the resistance of the test microorganisms to certain steam sterilization processes
Implementation Method 2
The wax composition has a melting point between 78° C. and 120° C.
Implementation Method 3
spores of microorganisms capable of producing an enzyme that catalyzes the reaction of a non-fluorescent substrate to a fluorescent product that can be detected to indicate the presence of surviving spores
Implementation Method 4
sterilization may include the administration of steam, dry heat, chemicals (e.g., ethylene oxide, hydrogen peroxide), or radiation, to the equipment or devices being sterilized
Data Source
AI summary
A self-contained sterilization process biological indicator is provided. The indicator includes a housing. Test microorganisms disposed in the housing are enveloped by a wax composition. The wax composition comprises a long-chain (greater than C22) linear or branched alkyl or alkenyl alcohol, wherein the alkyl or alkenyl alcohol is not linked through an ester bond or an ether bond to a short chain alkyl or aryl (C1-C6) group, wherein the alkyl or alkenyl alcohol is not linked through an ester bond or an ether bond to a long chain (C8-C36) alkyl or alkenyl group, wherein the alkyl or alkenyl alcohol is not linked through an amide bond to a linear or branched long chain (C8-C36) alkyl or alkenyl amine or acid. The wax composition has a melting point between 78° C. and 120° C. Also contained in the housing are a nutrient composition and an openable container containing a liquid medium.