Sealed Radionuclide Generator Column Sterilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for sterilizing radionuclide generator column assemblies are complex and costly, as they require vented systems that can lead to radiological contamination and moisture re-entry during the sterilization process, increasing the risk of contamination and reducing efficiency.
Innovation Solution
A method and system for sterilizing radionuclide generator column assemblies by sealing the inlet and outlet ports and exposing them to a steam-air mixture in a controlled sterilization chamber, where the rate of compressed air introduction is managed to match the partial pressure within the sealed assembly, ensuring complete sterilization without venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vented column assemblies are used for sterilization, then sterilization can be performed, but radiological material may be released and moisture may re-enter the fluid line
Solution Approach 1:
The patent removes the vent opening from the column assembly during sterilization, extracting the source of potential contamination and moisture re-entry. By sealing the outlet port with a cap, the system eliminates the vent pathway that would otherwise allow radiological material release and moisture ingress, while still achieving effective sterilization through the sealed autoclave process
Solution Approach 2:
The patent applies preliminary protective action by sealing the outlet port with a cap before the sterilization process begins. This pre-emptive measure prevents radiological contamination and moisture re-entry from occurring in the first place, rather than attempting to mitigate these issues after they arise during vented sterilization
2Object-affected harmful factors
If vented caps or covers are used to cover the outlet port, then moisture re-entry is inhibited, but cost and complexity of the sterilization process increase
Solution Approach 1:
The patent merges the protective cap function with the sterilization chamber environment. Instead of using complex vented caps with multiple components, the simple cap is sealed within the autoclave chamber, combining the protection function with the sterilization process itself. This integration simplifies the overall system while maintaining moisture prevention
Solution Approach 2:
The patent applies local quality by sealing only the specific outlet port area that is susceptible to moisture re-entry, rather than requiring complex vented caps covering the entire assembly. The cap is positioned precisely at the outlet port to provide localized protection, reducing overall device complexity while maintaining effectiveness
3Reliability
If sealed column assemblies are sterilized with steam-air mixture, then sterility assurance is enhanced, but pressure control complexity increases
Solution Approach 1:
The patent implements feedback control by monitoring the pressure differential between the sterilization chamber and the sealed column assembly interior. The system continuously adjusts the steam-air mixture introduction rate based on this feedback, maintaining pressure equilibrium while achieving terminal sterilization. This closed-loop control enhances sterility assurance without requiring overly complex manual pressure management
Solution Approach 2:
The sealed column assembly essentially sterilizes itself through the controlled steam-air exposure. The pressure control system merely facilitates this self-sterilization by maintaining appropriate pressure conditions, rather than requiring complex active sterilization mechanisms within the assembly itself
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 results in a completely sealed, terminally-sterilized column assembly with enhanced sterility assurance, reduced risk of contamination, and simplified sterilization processes, achieving higher Sterility Assurance Levels (SAL) compared to traditional methods.
Implementation Method 1
sterilizing the sealed column assembly, by exposure to a steam-air mixture including steam and compressed air
Implementation Method 2
sterilizing the sealed column assembly, by exposure to a steam-air mixture including steam and compressed air, to form a terminally-sterilized column assembly
Implementation Method 3
controlling the rate at which compressed air is introduced into the sterilization chamber to maintain a partial pressure within the sterilization chamber substantially equal to a partial pressure within the sealed column assembly
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Systems and methods for sterilizing a column assembly including a column having an interior containing a retaining media and a parent radionuclide retained by the retaining media, an inlet port in fluid communication with the interior of the column, and an outlet port in fluid communication with the interior of the column. The method includes sealing at least one of the inlet port and the outlet port to form a sealed column assembly such that fluid communication with the column interior though both the inlet port and the outlet port is prevented, and sterilizing the sealed column assembly to form a terminally-sterilized column assembly.