Self-contained Biological Indicator with Breakable Barrier
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Solution Overview
Problem
Current sterilization indicators, particularly those using glass ampoules, face challenges in quickly evaluating sterilization efficacy due to long incubation periods and potential light path obstruction from ampoule fragments, which can be impractical for medical devices and instruments.
Innovation Solution
A self-contained sterilization indicator system featuring a polymeric container with a cap that encapsulates the growth medium and microorganisms, utilizing a breakable barrier made from polymeric material or metal foil that does not shatter, allowing for reduced light path obstruction and enabling rapid activation by puncturing the barrier to release the medium, thus minimizing the need for extensive incubation periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass ampoules are used to contain growth medium, then the indicator system can be activated by breaking the ampoule, but light path obstruction occurs due to ampoule fragments
Solution Approach 1:
The patent replaces durable glass ampoules with disposable polymeric containers that can be safely discarded after use. The polymeric container holds the growth medium and is activated by puncturing a barrier, then discarded along with any potential contaminants, eliminating the need to break glass and avoiding light path obstruction from fragments.
Solution Approach 2:
The patent changes the material parameter from glass to polymeric material for the container. This material substitution maintains the container's integrity during sterilization and handling while eliminating the harmful fragmentation issue. The polymeric barrier is designed to puncture cleanly without shattering, maintaining reliability while removing the harmful effect.
2Measurement precision
If long incubation periods are used to obtain detectable spore outgrowth, then accurate sterilization efficacy evaluation is achieved, but the time required for results becomes impractical
Solution Approach 1:
The patent introduces an intermediary substance - a fluorescent substrate - that reacts with enzymes produced by surviving spores. Instead of directly observing slow spore outgrowth and colony formation, the system uses the fluorescent substrate as a mediator that produces a rapid fluorescent signal when enzymatically degraded, allowing quick detection of sterilization efficacy within hours rather than days.
Solution Approach 2:
The patent employs fluorescent substrates that undergo color/fluorescence changes when acted upon by microbial enzymes. This optical signal provides rapid, visible evidence of spore survival or death, replacing the slow visual observation of colony growth. The fluorescent signal appears within hours, enabling quick assessment of sterilization efficacy without extended incubation.
3Reliability
If medical devices are kept inactive during extended evaluation periods, then thorough sterilization verification is achieved, but device availability and productivity are reduced
Solution Approach 1:
The patent uses fluorescent substrates as intermediaries that provide rapid detection signals. This allows sterilization verification to be completed within hours rather than days, enabling medical devices to remain available for use while still achieving thorough verification. The fluorescent signal provides definitive evidence of sterilization efficacy quickly, eliminating the need to keep devices inactive for extended periods.
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 allows for a more rapid assessment of sterilization efficacy, reducing the time required for results and preventing light path obstruction, making it suitable for immediate use with medical devices and instruments.
Implementation Method 1
at least one projection (36) disposed within the container for puncturing the breakable barrier (40)
Implementation Method 2
which utilizes an enzyme that occurs naturally in the spore coat to degrade 4-methylumbelliferyl-α-D-glucoside to a fluorescent breakdown product
Implementation Method 3
The fluorescence signal associated with this enzyme can be measured within one to three hours
Data Source
AI summary
The disclosed invention provides a self-contained sterilization indicator for evaluating the effectiveness of a sterilization process. The sterilization indicator includes a cap configured for housing a growth medium, the cap being mountable on a container that contains a concentration of microorganisms. The cap comprises an inner chamber for housing the growth media. The inner chamber has an opening and a breakable barrier overlying the opening for encapsulating the growth media within the inner chamber of the cap. The biological indicator is adapted for breaking the breakable barrier at a selected time to introduce the growth medium into the container such that the growth medium contacts the microorganisms.