PEN-TYPE DRUG INJECTION DEVICE AND DOSE SETTING LIMITER MECHANISM THEREFOR

摘要

The present invention relates to a pen type drug delivery device having a dose setting limiter mechanism. The mechanism comprises a housing (10, 30, 40; 40′), a dose setting member (50), which during dose setting rotates relative to the housing (10, 30, 40; 40′) in a first direction and which during dose dispensing rotates relative to the housing (10, 30, 40; 40′) in a second opposite direction, and a limiting element (60) limiting the rotational movement of the dose setting member between a zero dose position and a maximum dose position. The limiting element (60) is rotationally constrained but axially displaceable relative to one of the housing (10, 30, 40; 40′) or the dose setting member (50) and is movable helically (53) relative to the other of the housing (10, 30, 40; 40′)or the dose setting member (50). These movements have end stops (54, 55) limiting the relative movement of the limiting element (60) and thus the dose setting member.

主权项

1. Limiter mechanism for an injection device, the mechanism comprising a housing (10, 30, 40; 40′), a dose setting member (50), which during dose setting rotates relative to the housing (10, 30, 40; 40′) in a first direction and which during dose dispensing rotates relative to the housing (10, 30, 40; 40′) in a second opposite direction, and a limiting element (60) limiting the rotational movement of the dose setting member between a zero dose position and a maximum dose position, wherein the limiting element (60) is movable on a first path axially displaceable relative to one of the housing (10, 30, 40; 40′) or the dose setting member (50) and is movable on a second, helical path (53) relative to the other of the housing (10, 30, 40; 40′) or the dose setting member (50), and wherein at least one of one of the first path and the second path (53) has an end stop (54, 55) limiting the relative movement of the limiting element (60).