Patent ID: 8728043

Claim:
A drug delivery device having a driver locking feature comprising, a cartridge holder configured to contain a cartridge of medicament connected to a dose dialing assembly, where the dose dialing assembly comprises an outer housing and an inner stationary housing having at least one internal groove on an inner surface; a driver positioned within the inner housing; and a flexible tab integral with either the driver or a blocking member, where the tab engages the at least one internal groove to form a detent such that the tab disengages from the at least one internal groove during dose dialing, wherein the blocking member is positioned inside the driver, but is not threadedly engaged with the driver, and is configured such that the blocking member must slide relative to the driver to lock the flexible tab into the at least one internal groove to prevent disengagement of the tab from the at least one internal groove during dose dispensing such that the driver follows the path of the groove.