Vacuum Chamber Moisture Detection for Hydrogen Peroxide Sterilization
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Solution Overview
Problem
Current chemical vapor sterilization processes for medical devices are inefficient due to the time required to confirm sterilization efficacy, which can lead to inventory management issues and risk of infection, especially when moisture is present in the vacuum chamber, as it can interfere with hydrogen peroxide sterilization.
Innovation Solution
A sterilization system that uses a humidity sensor to measure moisture content within the vacuum chamber by withdrawing air, maintaining a conditioning pressure, and reintroducing air to detect residual water vapor, allowing for accurate determination of chamber dryness before introducing hydrogen peroxide, and incorporating load conditioning techniques to remove excess moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sterilization processes are used without moisture detection, then the sterilization can proceed without delay, but the sterilization efficacy cannot be confirmed and may be compromised by moisture presence
Solution Approach 1:
The system performs preliminary moisture detection by drawing vacuum and measuring pressure changes before introducing the sterilant. This preliminary action confirms the absence of moisture that would compromise sterilization efficacy, allowing the process to proceed confidently without delay.
Solution Approach 2:
The system continuously monitors pressure changes during vacuum drawing and provides feedback on moisture presence. This feedback mechanism enables real-time determination of whether sterilization conditions are appropriate, eliminating uncertainty and potential reprocessing delays.
2Reliability
If moisture detection methods are implemented, then sterilization efficacy can be confirmed, but the system complexity increases
Solution Approach 1:
The system uses the existing vacuum pump and pressure sensor to perform moisture detection as a self-service function. The vacuum drawing process serves dual purposes: creating vacuum conditions for sterilization and simultaneously detecting moisture through pressure change measurement. This eliminates the need for separate moisture detection equipment.
Solution Approach 2:
The pressure sensor and vacuum system perform multiple functions: they create the vacuum environment required for sterilization and simultaneously detect moisture presence through pressure change analysis. This multi-functionality reduces overall system complexity while enabling reliable sterilization verification.
3Quantity of substance
If vacuum drawing is performed to remove moisture, then moisture content decreases, but the process time increases
Solution Approach 1:
The system performs partial vacuum drawing just sufficient to detect moisture presence through pressure changes, rather than extending vacuum drawing to completely remove all moisture. This partial action achieves the critical detection function without unnecessary time extension.
Solution Approach 2:
The system rapidly draws vacuum only long enough to measure pressure changes and determine moisture content, then quickly transitions to the sterilization phase. This rushing through the vacuum drawing phase minimizes time loss while still achieving the essential moisture assessment.
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 approach reduces the time needed to confirm sterilization efficacy, ensures effective hydrogen peroxide sterilization by ensuring dry conditions, and prevents the use of non-sterile devices, thereby minimizing infection risks and optimizing inventory management.
Implementation Method 1
A first humidity sensor disposed within the vacuum chamber and configured to detect water vapor in a gas phase
Implementation Method 2
A vacuum pump configured to draw a vacuum within the vacuum chamber
Implementation Method 3
If healthcare personnel erroneously introduced water into the chamber on the load, the water will begin evaporating as the pressure within the chamber is lowered
Implementation Method 4
The chamber may be heated, which may help vaporize water that may be within the chamber
Implementation Method 5
the hydrogen peroxide gas may be excited via an electric field to change the gas into a plasma
Data Source
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AI summary
A method of operating a sterilization system having a vacuum chamber for sterilizing instruments, the chamber connected to a reservoir of sterilant by a valve in a closed state, is disclosed. The method comprises placing the instruments in a non-sterile state in a sterilization pack, opening the chamber, placing the pack into the chamber, closing the chamber, withdrawing a first volume of air from the chamber, changing a volume of liquid water into vapor, opening the valve, introducing the sterilant into the chamber, withdrawing the sterilant from the chamber, introducing a second volume of air into the chamber, opening the chamber, removing the pack from the chamber, and removing the instruments in a sterile-state from the pack. The method may also include taking a baseline humidity measurement while the pressure within the chamber is a first pressure, lowering the pressure within the chamber to a conditioning pressure, maintaining the conditioning pressure for a dwell time, increasing the pressure within the chamber, acquiring a second humidity measurement from within the chamber, and comparing the baseline humidity measurement to the second humidity measurement.