Patent ID: 8986259
Filing Date: 2015-03-24
Classification: A61M,Y10T

Abstract:
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.