Piston rod assembly for a drug delivery device

摘要

Various embodiments of piston rod assemblies, drug delivery devices making use of such piston rod assemblies, and methods for assembling such piston rod assemblies and drug delivery devices are provided. In one embodiment, a piston rod assembly for a drug delivery device is provided, wherein the piston rod assembly is configured to engage a piston of a medicament cartridge. The piston rod assembly comprises (i) a piston rod, (ii) at least one adjusting member displaceably engaged with a distal end section of the piston rod, wherein the at least one adjusting member is displaceable along a long axis of the piston rod, and (iii) at least one interlock member configured to mutually lock the at least one adjusting member and the piston rod in an arbitrary relative axial position.

主权项

1. A piston rod assembly for a drug delivery device, wherein the piston rod assembly is configured to engage a piston of a medicament cartridge, comprising:
a piston rod having a longitudinal axis and terminating at a distal end; an adjusting member displaceably engaged with a distal end of the piston rod, wherein the adjusting member is displaceable along the longitudinal axis of the piston rod while engaged on the distal end, and at least one interlock member configured to mutually lock the adjusting member and the piston rod together in an arbitrary relative axial position, wherein the interlock member is integral to the piston rod and comprises at least one resiliently biased tongue member, where the resiliently biased tongue member is configured to engage with a portion of a corrugated section of an outer surface of the adjusting member.