Axially Movable Shield Grabber for Medicament Delivery Device
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Solution Overview
Problem
Existing medicament delivery devices with rigid needle shield removal assemblies are not compatible with flexible needle shields, leading to potential sterility issues due to movement of the syringe within the housing during impacts, as the shield grabber is fixedly arranged and cannot accommodate tolerance variations.
Innovation Solution
A front cap with an axially movable shield grabber support and hook elements that securely connect to the needle shield, allowing for axial movement to compensate for syringe play within the device, ensuring the needle shield remains attached during impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the shield grabber is rigidly arranged in the cap, then the structure is simple and stable, but the needle shield may come loose during impact due to syringe movement
Solution Approach 1:
The shield grabber is designed to be axially movable relative to the cap housing, transforming from a static rigid connection to a dynamic adjustable connection. This allows the shield grabber to move axially within the cap to maintain engagement with the needle shield during syringe movement or impact, preventing dislodgement while preserving structural integrity.
2Reliability
If the shield grabber is axially movable relative to the cap, then the needle shield remains secure during impact, but the device complexity increases
Solution Approach 1:
The shield grabber assembly is segmented into movable and stationary components. The shield grabber itself is made as a separate movable element that can slide axially within the cap housing, while the cap remains stationary. This segmentation allows independent movement of the grabber to maintain needle shield engagement without requiring complex mechanisms in the entire device.
Solution Approach 2:
The shield grabber acts as an intermediary element between the cap and the needle shield. It provides a flexible connection that can accommodate movement while maintaining secure engagement. The grabber's movable nature allows it to absorb displacement caused by syringe play or impact, preventing direct transmission of movement to the needle shield that would cause dislodgement.
3Ease of manufacture
If a fixed shield grabber arrangement is used, then the manufacturing is simpler, but the device is not compatible with flexible needle shields
Solution Approach 1:
The movable shield grabber design creates a dynamic connection that can adapt to different needle shield types. The axial movement capability allows the grabber to maintain engagement whether the needle shield is rigid or flexible, as the grabber can accommodate the different mechanical properties and deformation characteristics of various shield types during use and impact.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The present invention relates to a front cap (104) for a medicament delivery device (100) having a proximal end (101) and a distal end (102), said front cap being configured to be releasably connected to the medicament delivery device and comprising a shield grabber support (108) and a shield grabber (115) for connecting the front cap (104) to an outer surface of a needle shield (114) of a syringe (107) positioned within said medicament delivery device, wherein said shield grabber (115) is coupled to said shield grabber support (108) such that said shield grabber (1 15) is axially moveable relative to the shield grabber support (108).