Patent ID: 9687612
Date: 2017-06-27
CPC Classifications: A61M

Claim:
1. A dose setting mechanism comprising: a spindle; a spindle nut engaged with the spindle, wherein the spindle has a first helical groove extending along an outer surface of the spindle, the spindle nut has a second helical groove extending along an inner surface of the spindle nut, and the first helical groove is engaged with the second helical groove; and a lock nut having a first coding feature, wherein the spindle nut comprises one of a first plurality of protrusions and teeth that is configured to non-rotationally engage with one of a second plurality of protrusions and teeth on the lock nut and thereby prevent the spindle nut from rotation relative to the lock nut, wherein when a first cartridge assembly having a second coding feature is inserted in the dose setting mechanism, the first coding feature non-rotationally engages the second coding feature such that the lock nut prevents rotation of the spindle nut and dispensing of a dose is allowed, and wherein when a second cartridge assembly that does not have the second coding feature is inserted in the dose setting mechanism, the spindle nut is allowed to rotate and dispensing a dose is prevented, wherein the first coding feature corresponds to the second coding feature such that, when the first coding feature engages the second coding feature, the lock nut is non-rotationally engaged to the first cartridge assembly wherein the lock nut is allowed to rotate relative to the housing when the second cartridge assembly is inserted in the drive setting mechanism, and wherein the lock nut is prevented from rotating relative to the housing, by the non-rotational engagement between the first coding feature and the second coding feature, when the first cartridge assembly is inserted in the dose setting mechanism.