Auto-Injector Anti-Pricking Mechanism and Container Stability
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Solution Overview
Problem
Existing injection devices face challenges in preventing accidental pricking and product container dislodgment or breakage during use, with current designs either allowing accidental access to the needle or risking the product container's stability.
Innovation Solution
The injection device incorporates a reducing piece that narrows the opening area around the needle to prevent finger access and a holding member that secures the product container, ensuring it remains attached and stable during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the opening area is made large to facilitate assembly and access, then the ease of operation is improved, but the risk of accidental needle pricking increases
Solution Approach 1:
The opening area is segmented into two functional zones: an outer opening for assembly access and a inner opening with reduced cross-section for needle access. This segmentation allows the outer opening to remain large for easy assembly while the inner opening prevents finger access to the needle, thus resolving the contradiction between ease of assembly and safety.
Solution Approach 2:
A reducing piece is introduced as an intermediary element between the outer opening and the needle. This reducing piece with its reduced cross-section acts as a mediator that allows assembly access through the outer opening while blocking finger access to the needle through the inner opening, thereby maintaining both ease of assembly and safety.
2Reliability
If the product container is firmly secured to prevent dislodgment, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The holding member is merged with the product container holder to form an integrated structure. This combination allows the holding member to secure the product container while being part of the existing holder structure, thus improving reliability without significantly increasing device complexity.
Solution Approach 2:
The holding member is designed to engage with the product container at multiple points along its longitudinal axis, creating equipotential securing positions. This allows the product container to be firmly secured at various positions without requiring complex adjustment mechanisms, thereby improving reliability while maintaining simplicity.
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
The invention relates to an injection device for administering a product, comprising a sleeve-shaped housing (1), a needle guard sleeve (2) which is longitudinally displaceable within the housing and simultaneously serves as a trigger element, a product container holder (4) which receives a product container (5) with a needle guard cap (6) detachably attached thereto, a drive element (7) which acts on the product container, and a withdrawal element (3) with an engagement element (3a) for withdrawing the needle guard cap (6) from the product container (5). In the delivered state of the injection device, the needle guard sleeve is axially fixed relative to the housing and has an engagement element (2a) which engages positively with a counter-engagement element (1b) formed by the housing.The removal element has a retaining section (3c) which, in the delivered state, is located axially at the level of the engagement element and thus ensures that movement of the needle guard sleeve relative to the housing is prevented in the delivered state. Removing the removal element removes the retaining section and releases the engagement element of the needle guard sleeve for movement.