Method and assembly for a drug delivery device

摘要

A method for securing a cartridge (4) in a cartridge holder (3) is provided, the method comprising the steps of
inserting the cartridge (4) into the cartridge holder (3), the cartridge holder (3) having a proximal end and a distal end,axially displacing the cartridge (4) in a proximal direction with respect to the cartridge holder (3) from a distal initial position to a proximal end position andsecuring the cartridge (4) in the end position against displacement in the distal direction with respect to the cartridge holder (3). An assembly for a drug delivery device (1) is provided comprising a cartridge (4), an adjusting member (12, 25, 28, 34) and a cartridge holder (3). The cartridge holder (3) has a distal end and a proximal end. The adjusting member (12, 25, 28, 34) is secured to the cartridge holder (3). The adjusting member (12, 25, 28, 34) holds a distal portion of the cartridge (4) at a distance with respect to a distal portion of the cartridge holder (3).

主权项

1. A method for securing a cartridge in a cartridge holder of a drug delivery device, wherein the drug delivery device is configured to dispense at least one dose of a drug, the method comprising the following steps:
providing the cartridge comprising a piston, wherein a distal portion of the cartridge comprises an outwardly directed shoulder portion, inserting the cartridge into the cartridge holder, the cartridge holder comprising a proximal end and a distal end, wherein a distal portion of the cartridge holder comprises an inwardly directed flange portion, the shoulder portion of the cartridge being suitable dimension to abut the flange portion of the cartridge holder, prior to dose dispense, utilizing an adjusting member to axially displace the cartridge in a proximal direction with respect to the cartridge holder from a distal initial position to a proximal end position, so as to reduce a gap between a piston rod and the piston of the cartridge, utilizing the adjusting member to secure the cartridge in the proximal end position against displacement in a distal direction with respect to the cartridge holder, and preventing an abutment of the shoulder portion of the cartridge and the flange portion of the cartridge holder, wherein the adjusting member is used for securing the cartridge in the cartridge holder and wherein securing the cartridge in the cartridge holder comprises securing the adjusting member against displacement with respect to the cartridge holder in the distal direction when the cartridge is in the proximal end position, and wherein the adjusting member extends from an inside of the cartridge holder to an outside of the cartridge holder, wherein an outer surface of the adjusting member accessible from the outside of the cartridge holder is provided for attaching a needle unit to the adjusting member.