DRUG DELIVERY DEVICE SYSTEM AND DRUG DELIVERY DEVICE Russian patent published in 2025 - IPC A61M5/24 

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment and is aimed at a system for a drug delivery device, for example, an injection device, for selecting and dispensing a certain number of variable user doses of the drug, and to the drug delivery device. Drug delivery device system comprises a casing, a cartridge holder and additionally comprises at least one spring element. Casing comprises at least one coding element of the casing selected from a group of at least two different coding elements of the casing. Cartridge holder comprises at least one holder coding element selected from a group of at least two different holder coding elements, wherein the cartridge holder is adapted for detachable attachment to the casing, if the coding element of the casing corresponds to the coding element of the cartridge holder, whereas if the coding element of the casing does not correspond to the coding element of the cartridge holder, then complete attachment of the cartridge holder to the casing is prevented. Housing and the cartridge holder comprise at least one bayonet type fastening interface for detachable attachment of the cartridge holder to the housing by means of a fastening movement comprising a first step and a second step, wherein the first step includes at least a component of axial movement of the cartridge holder relative to the casing and the second step includes at least a component of rotational movement of the cartridge holder relative to the casing. At least one spring element is arranged and configured so that it is stretched during the first and/or second stage of the fastening movement, at least if the coding element of the casing does not correspond to the coding element of the holder, and wherein the spring element is positioned and configured to move the cartridge holder relative to the casing in a direction opposite to the fastening movement when it relaxes. Drug delivery device comprises the above-described system and a cartridge containing a drug preparation.

EFFECT: invention provides additional, for example, tactile or visual feedback for the user when a blockage occurs, so that an attempt to attach an incompatible cartridge holder/mechanism becomes more evident.

15 cl, 10 dwg