Coded Cartridge Holder Fastening for Correct Drug Cartridge Fit

The patent replaces the optical/color-based identification system with a mechanical coding system. The cartridge holder includes a coding feature (such as a protrusion or groove) that mechanically interacts with a corresponding feature on the cartridge. This mechanical interface ensures that only the correct cartridge type can be physically inserted and secured to the drug delivery device, eliminating reliance on visual discrimination and providing tactile feedback for proper identification.

The patent implements preliminary anti-action by designing the cartridge holder with a coding feature that prevents incorrect cartridges from being inserted in the first place. The mechanical code (protrusion/groove configuration) is designed such that mismatched cartridges physically cannot engage with the holder, blocking the harmful action of incorrect cartridge insertion before it can occur. This proactive prevention mechanism addresses medication errors at the source rather than requiring complex verification procedures.

The patent employs asymmetry in the mechanical coding system by creating non-symmetric protrusions or grooves on the cartridge and corresponding asymmetric receiving features on the cartridge holder. This asymmetric design ensures that only the correct cartridge type with the matching asymmetric code can be inserted and secured. The asymmetric features provide reliable compatibility verification while maintaining a relatively simple overall structure, as the coding is integrated into the existing fastening mechanism rather than adding separate complex verification systems.