Tamper-Evident Closure Assembly for Medical Syringes
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Solution Overview
Problem
Current medical device closures fail to provide a secure, tamper-evident, and cost-effective solution for pre-loaded syringes and other administering devices, risking unauthorized access and contamination, especially in scenarios where expensive or addictive medications are involved.
Innovation Solution
A tamper-evident closure assembly featuring a housing with a snap-fit cover and indicator ring that restricts removal of the tip cap, providing a clear visual indication of tampering or use through a frangible connection, allowing secure attachment to various medical devices without requiring welding or complex assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional closure assembly is used for pre-loaded syringes, then the device can be manufactured and distributed, but the closure fails to prevent or indicate unauthorized access and tampering
Solution Approach 1:
The closure assembly is divided into distinct functional segments: a tip cap that seals the syringe tip, a frangible ring that provides tamper evidence, and a retention structure that holds the cap in place. This segmentation allows each component to perform its specific function while maintaining overall simplicity
Solution Approach 2:
The frangible ring is pre-positioned around the tip cap in a captured state before the syringe is used. This preliminary arrangement ensures that any attempt to access the syringe contents will automatically break the ring, providing immediate tamper evidence without requiring additional mechanisms
2Reliability
If a secure tamper-evident closure is implemented, then unauthorized access is prevented, but the manufacturing cost and complexity increase
Solution Approach 1:
The frangible ring is constructed as a thin, flexible band that can be easily formed and attached to the tip cap. This thin-film approach reduces material costs and simplifies manufacturing compared to rigid tamper-evident mechanisms
Solution Approach 2:
The frangible ring is designed as a disposable component that is discarded after providing its tamper-evident function. This approach uses inexpensive materials and simplifies the overall manufacturing process by not requiring reusable or complex mechanisms
3Ease of operation
If the tip cap is made removable for access, then the discharge port can be accessed, but the sterility and security are compromised
Solution Approach 1:
The frangible ring is positioned to preemptively prevent unauthorized removal of the tip cap by creating a physical barrier that must be broken. This preliminary protective action maintains sterility and security while allowing legitimate access when the ring is intentionally broken by authorized personnel
4Reliability
If an indicator mechanism is added to show tampering, then tamper evidence is provided, but the device complexity increases
Solution Approach 1:
The frangible ring incorporates visual indicators such as color changes or visible break points that clearly indicate whether the ring has been broken. This provides obvious tamper evidence without requiring complex electronic or mechanical indicator mechanisms
Solution Approach 2:
The frangible ring serves dual functions: it physically prevents unauthorized access and simultaneously provides tamper evidence through its breakage. This self-service approach eliminates the need for separate indicator mechanisms, reducing overall device complexity
Data Source
AI summary
A closure assembly for a medical device such as a syringe comprises a housing having an open end and a hollow interior. A tip cap is removably disposed within the housing and includes a cover connected to the open end by a snap-fit connection. An indicator ring includes an access opening and is removably connected to the cover in interruptive, removable restricting relation to said tip cap. The access opening is dimensioned to facilitate passage of the syringe therethrough into attachment with the tip cap, with the tip cap disposed into disconnecting engagement with said indicator ring concurrent to removal of said tip cap and attached syringe through said open end. Upon removal of the tip cap and attached syringe through the open end of the housing, the indicator ring will be disposed in a surrounding captured disposition on the syringe, thereby providing a clear indication of tampering or use.