Patent ID: 9511193
Filing Date: 2016-12-06
CPC Classification: A61M

Claim Text:
1. An assembly for a drug delivery device, comprising: a housing having a proximal end and a distal end, a piston rod which is adapted to be displaced distally with respect to the housing away from a proximal start position and towards a distal end position for delivering a drug, an indicator for indicating at least two different operation conditions of the assembly, the indicator being rotatable with respect to the housing from a first indication position for a first condition of the assembly into a second indication position for a second condition of the assembly, the indicator including an inner member and an outer indication element, wherein the piston rod and the indicator are configured to mechanically interact for converting movement of the piston rod into rotational movement of the indicator, and wherein a first detent is provided which is configured to releasably secure the indicator in the first indication position such that movement into the second indication position is allowed, a second detent is provided which is configured to secure the indicator in the second indication position such that movement into the first indication position is prevented, at least one counter element configured to engage at least one of the first detent or the second detent, the piston rod is rotatable in a first rotational direction with respect to the housing in order to be displaced away from the proximal start position and towards the distal end position for delivering the drug, the indicator is arranged and configured to mechanically interact with the piston rod such that the indicator is rotated together with the piston rod in the first rotational direction in order to move the indicator from the first indication position into the second indication position, the first detent comprises a ramp on the outer indication element of the indicator for releasably securing the indicator in the first indication position, the ramp rising in the first rotational direction, and the second detent irreleasably secures the indicator in the second indication position while the piston rod travels to the distal end position, wherein the inner member and the outer indication element are connected by means of at least one flexible member and, wherein, when the first detent and the second detent are disengaged from the at least one counter element, the at least one flexible member provides a force which tends to displace the outer indication element in the distal direction with respect to the housing.