Pharmaceutical Overcap Top-Down Stopper Welding
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Solution Overview
Problem
Existing overcaps for pharmaceutical containers, such as those for infusion or injection solutions, require laborious handling due to the complex insertion of cannulas, spikes, or transfer sets, especially when the stopper is not fully exposed and is inserted from the bottom, leading to potential leakage and material contact issues.
Innovation Solution
An overcap design with a preproduced closure stopper made of soft plastic, where the complete top surface is exposed, allowing press fitting or welding to the receptacle from the top, facilitating easier insertion and ensuring a leak-tight connection, even when a cannula, spike, or transfer set is introduced, and incorporating a septum-like membrane to prevent solution contact with the stopper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stopper is inserted from the bottom of the receptacle and welded to the end face, then the connection strength and leak-proofing are improved, but the handling complexity increases and the top surface exposure is reduced
Solution Approach 1:
The stopper insertion direction is inverted from the conventional bottom-up approach to a top-down approach. The stopper is now inserted from the top opening of the receptacle and welded to the top surface, reversing the traditional manufacturing sequence to achieve both ease of operation and reliable sealing.
Solution Approach 2:
The stopper is pre-positioned and welded to the top surface of the receptacle before final assembly. This preliminary action ensures proper alignment and secure attachment, making subsequent handling and cannula insertion operations simpler and more reliable.
2Reliability
If the stopper is inserted from the bottom and welded to the end face, then the welding ensures leak prohibition, but the material contact prevention is compromised
Solution Approach 1:
By inverting the insertion direction to top-down, the welding process occurs at the top surface where controlled conditions can prevent material contact, while still achieving leak-proof sealing through the same welding mechanism applied at the inverted location.
3Ease of operation
If the stopper is fully exposed at the top surface, then the ease of insertion for cannulas is improved, but the manufacturing complexity increases
Solution Approach 1:
The stopper is preliminarily positioned and welded to the top surface in a controlled manufacturing step, ensuring full exposure is achieved systematically. This preliminary action simplifies subsequent cannula insertion operations while managing manufacturing complexity through structured process design.
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
This design simplifies the manufacturing process, ensures a leak-tight connection, and prevents material contact during use, making it easier to administer contents while maintaining sterility and preventing leakage.
Implementation Method 1
the stopper consisting of a soft plastic material
Implementation Method 2
the stopper is press fitted and/or welded to the receptacle
Data Source
AI summary
The present invention relates to an overcap intended for a pharmaceutical container, in particular a container for an infusion solution or an injection solution, having a receptacle containing at least one preproduced closure stopper accommodated therein, the stopper consisting of a soft plastic material, optionally after pulling off a protective covering, for insertion of a withdrawal cannula, a spike and/or a transfer set.