Patent ID: 9533104
Date: 2017-01-03
CPC Classifications: A61M

Claim:
1. An assembly for a drug delivery device, comprising a drive member which is adapted and arranged to be displaced in a dose setting direction for setting a dose of a drug and to be displaced in a dose delivery direction for delivering the set dose of the drug, a piston rod which is adapted and arranged to be displaced in the dose delivery direction via mechanical interaction with the drive member for delivering the set dose, at least one resilient pre-delivery element, wherein the assembly is configured such that the resilient pre-delivery element is biased when the drive member is displaced in the dose setting direction for setting the dose, the biased resilient pre-delivery element relaxes before the drive member is displaced in the dose delivery direction for delivering the dose, wherein, when the resilient pre-delivery element relaxes, the piston rod is displaced with respect to the resilient pre-delivery element in the dose delivery direction by a pre-delivery distance, wherein the resilient pre-delivery element is configured to transfer a force to the piston rod during the relaxation of the resilient pre-delivery element such that the force causes the piston rod to be axially displaced by a pre-delivery distance in the dose delivery direction.