Syringe Tip Cap with Frangible Breaking Lines
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Solution Overview
Problem
Existing syringe tip caps for securing the tip of syringe barrels are often complex, difficult to manufacture, and lack intuitive and cost-effective tamper evidence mechanisms.
Innovation Solution
A simple syringe tip cap design featuring a rigid outer cap with a cup-shaped distal cap member and a proximal sleeve member, incorporating annular breaking lines and a coupling strip for easy separation and removal, while providing tamper evidence through frangible portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional syringe tip caps are designed with complex structures to provide tamper evidence, then reliability of tamper evidence is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The tip cap is divided into multiple segments (first cap portion, second cap portion, bridge portion) connected by break lines. This segmentation allows the cap to provide tamper evidence through the separation of segments while maintaining a relatively simple overall structure that is easy to manufacture.
Solution Approach 2:
The tamper evidence function is extracted into a separate mechanism (the break lines and frangible portions) rather than being integrated into a complex overall structure. This allows the tamper evidence feature to be added without significantly increasing manufacturing complexity.
2Reliability
If conventional tip caps use multiple components and complex assembly, then sealing reliability is improved, but ease of manufacture deteriorates
Solution Approach 1:
Multiple functional elements (cap portions, bridge, tamper evidence features) are merged into a single integrated tip cap component. This merging reduces the number of parts and assembly steps while maintaining sealing reliability through the continuous structure that includes the resilient closure engagement features.
Solution Approach 2:
The tip cap structure serves multiple functions simultaneously: sealing the syringe tip, providing tamper evidence, and enabling needle attachment. The single integrated structure performs all these functions, reducing manufacturing complexity compared to separate components for each function.
3Reliability
If conventional tip caps use complex tamper evidence mechanisms, then reliability of tamper evidence is improved, but ease of operation deteriorates
Solution Approach 1:
The break lines are pre-formed during manufacturing, creating predetermined weak points that guide the user on how to open the cap. This preliminary action makes the opening process intuitive and easy while ensuring reliable tamper evidence, as the break lines are designed to break at specific locations.
Solution Approach 2:
The bridge portion acts as an intermediary element connecting the first and second cap portions. It includes break lines that serve as intermediaries for controlled separation, making the opening process simple while maintaining the integrity of the tamper evidence mechanism.
Data Source
AI summary
Disclosed is a method of sealing a syringe barrel having a syringe tip with a collar. The syringe tip is sealed with a resilient closure. A tamper evident syringe tip cap comprising a cap member and a sleeve member separated by an annular first breaking line is then pushed over the resilient closure, to couple the proximal end of the sleeve member with the collar. The distal end of the resilient closure is accommodated in the cap member and protrudes beyond the sleeve member. The first breaking line is bridged by a coupling strip. For use of the syringe and providing access to the closure, the first breaking line is broken by pivoting the cap member away. The sleeve member remains coupled to the collar. Further tearing the cap member downward causes breaking a second breaking line provided in the sleeve member, thereby enabling removing the entire syringe tip cap.