Mechanical Coding for Injection Device Housing Components
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Solution Overview
Problem
Current drug delivery devices lack mechanisms to prevent the incorrect loading and dispensing of medicaments, particularly in reusable injection systems where cartridges from different suppliers can be mistakenly used, leading to potential misuse of medications.
Innovation Solution
A drug delivery device housing system with mechanically coded components that ensure compatibility between the cartridge and the device, featuring a first housing component for the medicament and a second housing component with a drive mechanism, where the mechanical coding on one component matches a complementary counter coding on the other, preventing incorrect assembly and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cartridges are manufactured in standard sizes to comply with international standards, then manufacturing cost and supply chain efficiency are improved, but the risk of incorrect medicament loading increases
Solution Approach 1:
The patent applies local quality by adding specific coding features (protrusions, recesses, geometric patterns) to specific locations on the cartridge and housing components. These localized features differentiate otherwise identical standard-sized cartridges, enabling the system to maintain standardization benefits while preventing incorrect loading through localized identification markers.
Solution Approach 2:
The coding features act as an intermediary between the cartridge and housing components. This intermediary mechanism verifies compatibility before allowing assembly, serving as a mediator that prevents incorrect medicament loading while maintaining the benefits of standard cartridge sizes and suppliers.
2Adaptability or versatility
If reusable injection devices allow cartridge replacement, then device versatility and cost-effectiveness are improved, but the risk of unintended cross-use increases
Solution Approach 1:
The patent implements preliminary anti-action by incorporating coding features that prevent incorrect cartridge-housing combinations before assembly can occur. The geometric or positional coding on cartridges is designed to be incompatible with non-matching housing components, proactively blocking unintended cross-use before the harmful action can take place.
Solution Approach 2:
The patent applies asymmetry through non-uniform coding features (specific patterns of protrusions, recesses, or geometric shapes) on cartridges and corresponding housing components. This asymmetric design ensures that only the correct matching pair can be assembled, while asymmetric mismatches physically prevent incorrect cartridge replacement or cross-use.
3Reliability
If mechanical coding features are added to housing components, then medication error prevention is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the coding function into separate, modular features on the cartridge and housing components. Rather than creating a completely new complex system, the coding mechanism is segmented into discrete geometric elements (protrusions, recesses, patterns) that can be independently manufactured and assembled, minimizing overall device complexity while achieving the reliability goal.
Data Source
AI summary
A coded housing of a drug delivery device includes first and second housing components, respectively including a first and second connecting ends. An insert is provided on the first or second connecting end, and a receptacle is provided on the other one of the first and second connecting ends. The insert is insertable into the receptacle for mutually fastening the first and second housing components. A fastening element is provided on the insert, a counter fastening element complementary shaped to the fastening element is provided in the receptacle, a mechanical coding is provided on the insert and includes a coding feature, and a mechanical counter coding is provided in the receptacle and includes a counter coding feature. The mechanical coding and counter coding are operable to prevent an engagement of the fastening element with the counter fastening element when the mechanical coding does not match the mechanical counter coding.