Needle Shield Connector for Reliable Removal and Sterile Assembly
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Solution Overview
Problem
Existing injection devices face challenges in efficiently and reliably removing needle shields due to variations in geometry and type, which can compromise sterility and require complex assembly processes.
Innovation Solution
A connector mechanism, such as a staple or annular disc, is used to positively connect the needle shield to the main part, allowing for removal by moving the main part along the axis, accommodating various geometries and types of needle shields without axial insertion force, and ensuring secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connector mechanism is used to positively connect the needle shield to the main part, then the reliability of needle shield removal is improved, but the device complexity increases
Solution Approach 1:
The connector is designed as a separate component that can be independently manufactured and assembled. It includes distinct functional elements such as connection elements for attaching to the needle shield and engagement elements for interfacing with the main part, allowing each segment to be optimized independently while maintaining overall system reliability.
Solution Approach 2:
The connector is designed as a universal component that can accommodate different needle shield geometries and types through standardized connection interfaces. This multi-functional design allows the same connector structure to work with various needle shield configurations, reducing overall device complexity while maintaining reliable removal capability.
2Adaptability or versatility
If the connector accommodates various geometries and types of needle shields, then the adaptability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The connector incorporates adjustable geometric parameters such as flexible connection elements with varying angles and lengths, and engagement surfaces that can accommodate different radial and axial dimensions. These parameter variations allow the same connector design to adapt to multiple needle shield geometries without requiring high manufacturing precision for each specific configuration.
Solution Approach 2:
The connector includes dynamic elements such as flexible arms or springs that can deform elastically to accommodate variations in needle shield geometry. This dynamic adaptability allows the connector to maintain proper engagement across different needle shield types while using standard manufacturing tolerances, reducing the stringency of precision requirements.
3Ease of operation
If the connector provides secure attachment without axial insertion force, then the ease of operation is improved, but the strength of connection may be compromised
Solution Approach 1:
The connector transfers the connection force from the axial direction to radial or tangential dimensions through lever arms or cam mechanisms. This dimensional transformation allows the connector to achieve secure attachment through lateral engagement rather than axial insertion, making assembly easier while maintaining strong connection through mechanical advantage in alternative directions.
Solution Approach 2:
The connector acts as an intermediary element that mediates between the main part and the needle shield, distributing connection forces through multiple contact points and intermediate structural elements. This intermediary function allows secure attachment to be achieved through distributed lateral forces rather than concentrated axial insertion, improving ease of operation while maintaining connection strength.
Data Source
AI summary
The disclosure refers to an apparatus, including a needle unit including a needle arranged along a first axis, a needle shield which covers the needle, a main part, a connector for connecting the needle shield to the main part by a positive connection or an adhesive bond, such that the needle shield is removed when the main part is moved along the first axis away from the needle.