Syringe Tip Cap with Irreversible Locking for Tamper Evidence
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Solution Overview
Problem
The existing syringe tip cap production process is complex due to the need for three separate parts and their assembly, which complicates the sealing and tampering indication mechanism.
Innovation Solution
A syringe tip cap design featuring a fastening ring and a closure cap with interlocking tabs and recesses that are irreversibly damaged upon use, produced through a two-component injection-molding process to ensure secure sealing and tampering evidence without separate assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three separate parts (two-part closure cap, sealing element) are produced and joined together, then the sealing function and tampering indication are achieved, but the production process becomes elaborate and complex
Solution Approach 1:
The patent combines the closure cap and sealing element into a single integrated component produced by injection molding. The sealing element is formed as an integral part of the closure cap structure, eliminating the need for separate production and assembly operations while maintaining the sealing function and tampering indication capabilities
Solution Approach 2:
The integrated closure cap structure performs multiple functions simultaneously: it provides the sealing surface, contains the tampering indication mechanism, and forms the locking interface with the fastening ring. This multi-functionality reduces the number of separate components needed while achieving the same reliability
2Reliability
If three separate parts are produced and joined together, then the sealing and tampering indication are achieved, but the structure becomes elaborate and harder to produce
Solution Approach 1:
The sealing element and closure cap are merged into a single injection-molded component, simplifying manufacturing while preserving the tampering indication function. The locking tabs and recesses are formed as integral features of this unified structure, eliminating complex assembly steps
3Reliability
If locking tabs and recesses are designed to be irreversibly damaged upon use, then tampering evidence is ensured, but the locking mechanism cannot be reused
Solution Approach 1:
The locking tabs and recesses are designed as single-use, disposable locking elements. Once engaged, they are intentionally made to be irreversibly damaged or deformed upon attempted removal, providing tampering evidence. This sacrificial locking mechanism prioritizes security and evidence over reusability
Data Source
AI summary
A syringe tip cap sealingly closes a distal opening of a syringe body. The syringe tip cap has a fastening ring which can be placed and fastened on the syringe body about the distal opening, and a closure cap which closes the distal opening in a sealed manner and is connected releasably to the fastening ring. The fastening ring has a locking means device that locks together with a locking device of the closure cap. The locking device of the fastening ring and the locking device of the closure cap are configured in such a way that they cannot be unlocked without sustaining damage. The syringe tip cap may be produced in a two-component injection molding process.