Drive mechanism for a drug injection device comprising adhesive to block drive at end of device life to prevent reuse

摘要

A drive mechanism of a drug delivery device is presented having, a piston rod to operably engage with a piston of a cartridge containing a medicament, a first functional component and a second functional component whose position or orientation relative to each other is unambiguously correlated to a predefined axial position of the piston rod, wherein the first and/or the second functional component comprise at least one engaging portion to inseparably and to adhesively engage the first and the second functional component with each other for rendering the drive mechanism inoperable when the predefined axial position of the piston rod has been reached.

主权项

1. A drive mechanism of a drug delivery device, comprising:
a piston rod to operably engage with a piston of a cartridge containing a medicament; a first functional component; and a second functional component, where position or orientation of the first functional component and the second functional component relative to each other is unambiguously correlated to a predefined axial position of the piston rod, wherein at least one of the first functional component and the second functional component comprises at least one engaging portion to inseparably and to adhesively engage the first functional component and the second functional component with each other for rendering the drive mechanism inoperable when the predefined axial position of the piston rod has been reached, wherein the at least one engaging portion comprises a pressure sensitive adhesive, and wherein the first functional component comprises the piston rod which is adapted to exert distally directed thrust to the piston of the cartridge, wherein the second functional component comprises an insert having a through opening through which the piston rod extends, wherein the piston rod comprises an outer thread engaged with an inner thread of the through opening, and wherein the at least one engaging portion is arranged at a proximal end of the piston rod.