Multilayer Breakable Barrier for Leak-Resistant Sterilization Indicators
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Solution Overview
Problem
Existing biological indicators for sterilization processes face issues with culture medium leakage during vacuum and high-temperature sterilization, which compromises the integrity of the sterilization verification process.
Innovation Solution
A biological sterilization indicator system featuring a cap with a multilayer breakable barrier, composed of an aluminum layer and a polypropylene sealing layer, that is designed to prevent culture medium leakage by ensuring the barrier is not punctured until activation, using a snap-fit or screw-thread engagement mechanism to maintain separation from puncture members until activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a breakable barrier is used to separate culture medium from microorganisms, then the biological indicator can be activated to evaluate sterilization efficacy, but the breakable barrier may be punctured during vacuum and high-temperature sterilization processes causing culture medium leakage
Solution Approach 1:
The barrier is segmented into multiple layers (aluminum foil layer and polypropylene sealing layer) where each layer serves a specific protective function. The aluminum layer provides puncture resistance during sterilization while the polypropylene layer provides hermetic sealing, together preventing culture medium leakage while maintaining activation capability.
Solution Approach 2:
The barrier uses a composite structure combining aluminum foil and polypropylene sealing layers. This composite material configuration leverages the puncture resistance of aluminum and the hermetic sealing properties of polypropylene to simultaneously prevent leakage and allow controlled activation.
2Ease of operation
If the cap is positioned close to puncture members for activation, then activation is easier, but the culture medium may leak during sterilization due to barrier puncture
Solution Approach 1:
The cap is pre-positioned in a first position during assembly where the barrier is far from puncture members, ensuring protection during sterilization. Activation is achieved by moving the cap to a second position where the barrier contacts puncture members, separating the protection phase from the activation phase.
Solution Approach 2:
The system transitions from a static protective configuration to a dynamic activated state. The cap can be moved between a first position (barrier远离 puncture members) for sterilization protection and a second position (barrier contacts puncture members) for activation, enabling flexible control.
3Device complexity
If a single-layer barrier is used, then the device complexity is reduced, but the barrier cannot simultaneously provide puncture resistance and hermetic sealing
Solution Approach 1:
The barrier is divided into two functional segments: an aluminum foil layer for puncture resistance and a polypropylene sealing layer for hermetic sealing. This segmentation allows each layer to optimize its specific function while working together to provide comprehensive protection.
Solution Approach 2:
The barrier employs a composite structure with aluminum foil and polypropylene layers, where each material contributes its unique properties. The aluminum provides mechanical strength against puncture while the polypropylene provides hermetic sealing, achieving functionality that neither material could provide alone.
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 multilayer breakable barrier effectively reduces culture medium leakage during sterilization processes, ensuring accurate evaluation of sterilization efficacy by maintaining the integrity of the culture medium within the indicator system.
Implementation Method 1
a breakable barrier in the cap encapsulating the culture medium in the chamber
Data Source
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Figure 6
AI summary
A biological sterilization indicator for evaluating the effectiveness of a sterilization process includes a cap containing a culture medium, a container containing a concentration of microorganism, and a breakable barrier attached to the cap to encapsulate the culture medium therein. The breakable barrier is formed from a multilayer structure including an aluminum layer and a sealing layer. The biological indicator is configured such that the breakable barrier may be broken at a selected time by engaging the cap and the container at an activated position to introduce the culture medium into the container.