Cartridge Fixing Member for Asymmetric Drug Delivery Loading
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Solution Overview
Problem
Existing drug delivery devices face challenges in preventing the incorrect loading of cartridges containing different medicaments, which can lead to the dispensing of the wrong medicament or incorrect concentrations, and existing fixing mechanisms can cause mechanical and visual defects to the cartridges during insertion.
Innovation Solution
A fixing member with a fastening portion and a fixing structure that engages with a counter fixing structure on the housing component, accompanied by an alignment portion that aligns with a counter alignment structure on the sidewall, ensuring correct orientation and preventing improper insertion, thereby securing the cartridge in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical fixing structure is used to secure the cartridge in the housing component, then the cartridge fixing reliability is improved, but the risk of causing mechanical defects to the cartridge increases
Solution Approach 1:
A fixing member is introduced as an intermediary component between the cartridge and the housing component. The fixing member includes a fixing structure that engages with a counter-fixing structure on the housing component, while its outer surface is specifically designed to prevent direct harmful contact with the cartridge, thus mediating the interaction to achieve secure fixing without mechanical damage
Solution Approach 2:
The harmful fixing function is extracted from direct contact between the housing component and the cartridge. The fixing member takes over the fixing function by engaging with the housing component's counter-fixing structure, while deliberately avoiding contact with the cartridge, thus separating the fixing action from potential damage to the cartridge
2Ease of manufacture
If standard sized cartridges are used to comply with recognized standards, then the ease of manufacture and availability are improved, but the risk of incorrect medicament loading increases
Solution Approach 1:
While cartridges maintain standard sizes for manufacturing compliance, asymmetric coding features are incorporated: the fixing member has a specific asymmetric geometry that must match a corresponding asymmetric counter-fixing structure on the housing component. This asymmetric pairing ensures that only the correct cartridge type can be properly fixed, preventing incorrect medicament loading while preserving standard cartridge dimensions
3Ease of operation
If a simple insertion mechanism is used for cartridge loading, then the ease of operation is improved, but the ability to prevent improper insertion decreases
Solution Approach 1:
The fixing member incorporates an asymmetric alignment portion with a specific geometric profile that must match a corresponding asymmetric counter-alignment structure on the housing component. This asymmetric design guides the cartridge into the correct orientation during insertion, preventing improper insertion while maintaining a simple push-in operation that does not require complex user manipulation
Data Source
AI summary
The present disclosure relates to a cartridge assembly provided with a fixing member, wherein the fixing member is configured for fastening to a cartridge, wherein the cartridge is configured for insertion into a housing component of a drug delivery device, wherein the housing component comprises a sidewall confining a cartridge receiving space, the cartridge receiving space extending in a longitudinal direction (z), the fixing member comprising:a fastening portion for fastening to a neck portion of the cartridge,a fixing structure comprising a first fixing element configured to engage with a counter fixing structure of the housing component, andan alignment portion configured to align with a counter alignment structure provided on or in the sidewall of the cartridge holder.