Drug delivery device with dose dial sleeve rotational stop

摘要

A method and system for a dose setting mechanism of a drug delivery device. The dose setting mechanism includes an inner housing having a helical groove along an external surface of the housing. The inner housing includes a rotational stop feature near one end of the helical groove. The dose setting mechanism also includes a dial sleeve rotatably engaged with the helical groove of the inner housing. When a user rotates the dial sleeve to select a dose, the rotational stop member prevents the user from selecting a dose greater than a pre-defined maximum selectable dose.

主权项

1. A dose setting mechanism for a drug delivery device, said mechanism comprising:
an outer housing; an inner housing having a helical groove along an external surface of said inner housing, said inner housing comprising a first rotational stop member near one end of said helical groove, wherein the first rotational stop member comprises a first flexible arm member; and a dial sleeve having internal and external surfaces where the internal surface is rotatably engaged with said helical groove of said inner housing and where the external surface does not contain a helical groove and comprises a generally smooth outer surface, wherein, when a user rotates said dial sleeve to select a dose, said first rotational stop member prevents said user from selecting a dose greater than a pre-defined maximum selectable dose, wherein the internal surface of the said dial sleeve comprises an inner surface having a helical groove and a second rotational stop member, wherein said first rotational stop member of said inner housing engages with said second rotational stop member of said dial sleeve when a user attempts to select a dose greater than said pre-defined maximum selectable dose, wherein said second rotational stop member comprises a second flexible arm member, and wherein the second flexible arm member rotates out and contacts an internal surface of the outer housing when a user attempts to select a dose greater than said pre-defined maximum selectable dose.