Patent ID: 9440031
Filing Date: 2016-09-13
CPC Classification: A61M

Claim Text:
1. A drug delivery device comprising: a housing having a distal end comprising a needle holder having an outer surface with an outer diameter, where the outer surface is configured with a connector that engages a needle unit such that the needle unit is attached to the outer surface of the housing, where the needle unit has an outside diameter greater than the outer diameter of the needle holder and a reusable cap having an inner surface and configured to cover the distal end of the housing and comprising a retaining member configured to engage and re-engage a corresponding mating member located proximate to the needle holder on the housing to secure the cap to the housing repeatedly when the needle unit is not attached to the housing, where the cap has a protruding element on the inner surface that extends radially inward a distance such that it contacts the needle unit when a user attempts to the replace the cap on the distal end of the housing to prevent the retaining member from engaging the corresponding mating member when the needle unit is attached to the needle holder thereby providing feedback to a user to remove the needle unit before the cap can be replaced on the housing, wherein the at least one protruding element is formed as either (i) a step along the inner side wall of the cap or (ii) at least one rib on the inner side wall of the cap, the at least one rib being arranged along a longitudinal axis being arranged between the distal end and the proximal end.