Connector Cutting Element for Contamination-Controlled Powder Transfer
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Solution Overview
Problem
Rehydration systems for powder transfer bags are susceptible to contamination during the unsealing process, which compromises the integrity of the powder contents.
Innovation Solution
The use of inflatable sealing devices, such as balloons, and membranes to seal the mouth of the powder transfer bags, combined with a connector that includes a cutting element to safely open the seal when needed, minimizes contamination by maintaining the powder's integrity until use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the powder transfer bag is unsealed to allow powder to feed into the rehydration system, then the powder can be transferred and rehydrated, but the powder transfer bag and powder become susceptible to contamination
Solution Approach 1:
The cutting element is positioned and prepared in advance within the connector assembly, ready to make a precise cut through the sealing membrane at the mouth of the powder transfer bag. This preliminary positioning allows the system to maintain the sealed state during connection, then rapidly transition to an open state for powder transfer, minimizing the window of vulnerability to contamination while ensuring efficient powder flow into the rehydration system
Solution Approach 2:
The connector assembly serves as an intermediary device between the sealed powder transfer bag and the rehydration system. It provides a controlled interface where the cutting element can precisely open the sealing membrane, allowing powder to transfer through a controlled pathway rather than direct exposure, thereby reducing contamination risk while maintaining transfer efficiency
2Object-affected harmful factors
If a sealing membrane is used to seal the mouth of the powder transfer bag, then contamination is prevented, but the device complexity increases
Solution Approach 1:
A flexible sealing membrane made of material such as polyethylene or polypropylene is used to seal the mouth of the powder transfer bag. This thin film provides an effective barrier against contamination while remaining simple in structure. The membrane can be easily cut by the cutting element and allows for clean opening without requiring complex mechanical sealing mechanisms, thus maintaining low device complexity while effectively preventing contamination
Solution Approach 2:
The sealing system is segmented into distinct functional components: the sealing membrane itself, the connector assembly with the cutting element, and the flange structures. This segmentation allows each component to perform its specific function independently - the membrane provides contamination barrier, the cutting element provides controlled opening, and the flanges provide structural connection - simplifying the overall design while maintaining effective contamination prevention
3Reliability
If a cutting element is added to the connector to open the seal, then controlled opening is achieved, but the device complexity increases
Solution Approach 1:
The cutting element is extracted as a separate, dedicated component within the connector assembly, focused solely on the function of cutting the sealing membrane. This extraction allows the cutting function to be performed by a simple, reliable blade structure rather than integrating it into a complex multi-functional mechanism. The cutting element can be a straightforward annular blade that rotates or moves linearly to cut the membrane, providing reliable controlled opening without significantly increasing overall device complexity
Solution Approach 2:
The cutting element is designed with dynamic capability, allowing it to move from a retracted position to an extended cutting position. This dynamic movement enables the cutting action to occur only when needed, maintaining a simple structure during storage and transport, and providing reliable controlled opening during operation. The dynamic nature allows the system to transition between sealed and open states cleanly, enhancing reliability without requiring permanently complex mechanisms
Data Source
AI summary
A connector including a body defining a flange and cutting element sliding between a first position within the body and a second position external of the flange.