Luer-Lock Syringe Closure With Breakaway Tamper-Evident Seal
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Solution Overview
Problem
Existing syringes with Luer-Lock connections lack an easy-to-attach and reliable tamper-evident seal that is also easy to open, compromising security and usability.
Innovation Solution
A tamper-evident seal with an external thread engaging with the Luer-lock connector's internal thread, featuring a predetermined breaking point for easy removal, and an elastic sealing element that ensures a secure seal, facilitated by a plastic structure with positive-locking connections and axial displacement during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tamper-evident seal is provided for the Luer-lock connector, then security against tampering is improved, but the device complexity increases
Solution Approach 1:
The tamper-evident seal is divided into two functional sections: a first annular section with external threading that engages with the Luer-lock connector, and a second annular section that seals against the syringe barrel. These sections are connected by a predetermined breaking point, allowing the seal to be opened after use. This segmentation provides both security and ease of opening without requiring complex mechanisms.
2Ease of operation
If a predetermined breaking point is included for easy opening, then ease of operation is improved, but the reliability of the seal may be compromised
Solution Approach 1:
The predetermined breaking point is pre-formed between the first and second annular sections during manufacturing. This breaking point remains intact during storage and transport, maintaining seal integrity. When opening is required, the user simply applies rotational force, which cleanly breaks the predetermined point without compromising the sealing function. The breaking point is designed to fail in a controlled manner that preserves evidence of opening.
3Ease of operation
If the tamper-evident seal uses threaded engagement with the Luer-lock connector, then ease of operation is improved, but the device complexity increases
Solution Approach 1:
The first annular section of the tamper-evident seal incorporates external threading that engages with the standard Luer-lock connector's internal threading. This allows the seal to utilize the existing, universally accepted Luer-lock mechanism for attachment, eliminating the need for proprietary or complex fastening systems. The threaded engagement provides secure attachment and easy opening through simple rotational motion, while maintaining compatibility with standard syringe components.
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
The solution provides a secure, easy-to-open tamper-evident seal that maintains a tight seal and indicates tampering, enhancing the reliability and usability of pre-filled syringes.
Implementation Method 1
The tamper-evident seal has an elastic sealing element that seals the opening in the Luer cone
Implementation Method 2
The external thread is designed to correspond to the internal thread of the Luer-lock connector, allowing it to engage with the connector in a screw-like manner
Implementation Method 3
By breaking or releasing the predetermined breaking point, the tamper-evident seal can be opened and removed from the syringe barrel
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a syringe with a syringe cylinder (2) which is open at a first axial end and has an end wall (4) at its opposite second axial end with a Luer-Lock connection (6, 8) formed on this end wall, and a tamper-evident seal (12, 12') which closes the Luer-Lock connection (6, 8) and is connected to the syringe cylinder (2) via at least one predetermined breaking point (36), wherein the tamper-evident seal (12, 12') has a first annular section (18, 18') which is provided with an external thread (20, 20') which engages in the internal thread (10) on the outer cylindrical section (8) of the Luer-Lock connection.