Needle Cap Assembly With Septum-Sterilizing Interlock
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Solution Overview
Problem
Existing drug delivery devices require complex user interactions for preparing and operating, particularly in the sterilization of the septum before use, which can be overlooked by users, leading to potential contamination risks.
Innovation Solution
A needle assembly with a cap and blocking member that includes a disinfectant swab, where the blocking member moves to contact the septum upon removal, ensuring sterilization before the cap can be detached, and a pre-stressed resilient member for controlled needle assembly movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking member with disinfectant swab is added to ensure sterilization, then reliability is improved, but device complexity increases
Solution Approach 1:
The blocking member combines multiple functions into a single component: it acts as a physical block to prevent cap removal, holds the disinfectant swab for sterilization, and provides user interaction interface. This merging ensures sterilization is performed while avoiding the need for separate sterilization devices or steps.
Solution Approach 2:
The disinfectant swab is pre-positioned on the blocking member to contact the septum before the cap can be removed. This preliminary sterilization action ensures the septum is disinfected before use, preventing contamination risks that would occur if sterilization were omitted or performed later.
2Reliability
If multiple interaction steps are required for proper sterilization, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The blocking member physically prevents cap removal until the sterilization step is completed. By blocking the unwanted action (cap removal without sterilization), the design ensures users must perform the disinfectant swab contact on the septum before proceeding, making sterilization compliance unavoidable rather than optional.
Solution Approach 2:
The blocking member serves as an intermediary mechanism between the user and the cap. It mediates the interaction by requiring a specific action (moving the blocking member to allow swab contact) before permitting cap removal, thereby ensuring sterilization without requiring complex multi-step procedures.
3Reliability
If the cap is secured with threaded connection requiring multiple rotations, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The cap transitions from a statically secured state (threaded connection in initial position) to a dynamically movable state as it is rotated to the intermediate position. This dynamic transition allows the cap to be securely attached during storage and transport while enabling controlled removal during use, balancing security with operational ease.
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
Ensures proper sterilization of the septum before use, simplifying user interaction and reducing the risk of contamination, while maintaining ease of operation.
Implementation Method 1
A proximal end of the needle may be surrounded by a compressible spacer material... when the needle assembly contacts the cartridge retained within the drug delivery device the compressible spacer material is compressed and the cover foil and cartridge are pierced by the proximal needle end
Data Source
AI summary
A needle assembly for use with a drug delivery device comprises a cap releasably secured to the drug delivery device and a blocking member. The blocking member comprises a disinfectant swab and a user graspable portion. The blocking member is configured to be physically moved with respect to the needle assembly by a user. The needle assembly is configured such that in an initial position, the blocking member blocks the cap from being removed from the drug delivery device and movement of the blocking member from the initial position causes the disinfectant swab to contact a septum of a cartridge retained within the drug delivery device.