Patent ID: 9199040
Filing Date: 2015-12-01
Classification: A61M

Abstract:
1. A dose setting mechanism for a drug delivery device, wherein the dose setting mechanism is operable to be coupled to a cartridge housing of the drug delivery device configured to house a cartridge of medication, the dose setting mechanism comprising: a last dose lock-out mechanism preventing a user of said dose setting mechanism from setting a dose of said medication that is greater than said medication in said cartridge, said lock-out mechanism comprising: a dose setting mechanism housing; a rotatable shaft; a helical groove having a first pitch provided along a first portion of said rotatable shaft and a second pitch provided along a second portion of said rotatable shaft, said first pitch different from said second pitch; and a non-rotating member disposed between said dose setting mechanism housing and said helical groove of said shaft, wherein during dose setting of said drug delivery device, said shaft is rotated relative to said non-rotating member and moves axially with respect to said dose setting mechanism housing, while said non-rotating member traverses along said groove from a first end of said shaft towards a second end of said shaft, wherein said non-rotating member traverses along said groove until a dose greater than said medication remaining in said cartridge is selected and said non-rotating member prevents said shaft from rotating and increasing said dose, and wherein said non-rotating member comprises at least one substantially radial stop face, said at least one substantially radial stop face engaging at least one stop face on said rotatable shaft so that said non-rotating member prevents said shaft from rotating.