DRUG DELIVERY DEVICE
A drug delivery device has a housing with a longitudinal axis, a dose setting member actuatable by a user and rotatable around the longitudinal axis to set a dose to be delivered by the drug delivery device, a piston rod that is configured to be axially advanced in a proximal direction to deliver the set dose, and a dosing member for defining the axial advancement of the piston rod upon delivery of the set dose. The dosing member is axially movable along the longitudinal axis and rotationally movable around the longitudinal axis during dose setting, and the dosing member is rotationally fixed to the dose setting member during dose setting. The dosing member includes a maximum dose stop that is configured to engage with a maximum stop feature provided at the housing to limit movement of the dosing member with respect to the housing upon setting a maximum dose.
1 . A drug delivery device comprising:
a housing with a longitudinal axis;
a dose setting member configured to be actuatable by a user and rotatable around the longitudinal axis to set a dose to be delivered by the drug delivery device;
a piston rod configured to be axially advanced in a proximal direction to deliver the set dose; and
a dosing member to define the axial advancement of the piston rod upon delivery of the set dose,
the dosing member being axially movable along the longitudinal axis and rotationally movable around the longitudinal axis during dose setting,
the dosing member being rotationally fixed to the dose setting member during dose setting,
the dosing member comprising a maximum dose stop, the maximum dose stop configured to engage with a maximum stop feature to limit movement of the dosing member with respect to the housing when having set a maximum dose,
the maximum stop feature provided at the housing.
2 . The drug delivery device according to claim 1 , wherein the dosing member is rotationally movable with respect to the dose setting member during dose delivery.
3 . The drug delivery device according to claim 1 , wherein the dosing member is threadedly connected to the housing.
4 . The drug delivery device according to claim 1 , wherein the maximum dose stop comprises a stopping surface that is configured to axially abut the maximum stop feature of the housing upon setting the maximum dose, the stopping surface is orientated perpendicular to the longitudinal axis, and the stopping surface is an annular surface surrounding the longitudinal axis.
5 . The drug delivery device according to claim 1 , wherein the maximum dose stop protrudes from an outer surface of the dosing member or the maximum stop feature protrudes from an inner surface of the housing.
6 . The drug delivery device according to claim 1 , wherein the maximum dose stop is spaced apart from a distal end of the dosing member.
7 . The drug delivery device according to claim 1 , wherein the maximum stop feature of the housing has a limiting surface that is orientated perpendicular to the longitudinal axis, and the maximum dose stop engages with the limiting surface upon setting the maximum dose.
8 . The drug delivery device according to claim 1 , wherein the maximum stop feature of the housing is provided on a flexible element configured to snap over the maximum dose stop of the dosing member upon assembly of the drug delivery device, and the flexible element rests against a backing element, as the backing element being an outer housing surrounding an inner housing having the flexible element, after assembly of the drug delivery device to prevent disengagement of the maximum stop feature from the maximum dose stop.
9 . The drug delivery device according to claim 1 wherein the dosing member comprises a zero dose stop, the zero dose stop configured to engage with a zero stop feature to limit movement of the dosing member with respect to the housing upon the dosing member reaching a zero dose position, and the zero stop feature is provided at the housing.
10 . The drug delivery device according to claim 9 , wherein the zero dose stop engages with the zero stop feature in a contact plane that is angled with respect to a radial plane perpendicular to the longitudinal axis, and the contact plane is orientated perpendicular to the radial plane.
11 . The drug delivery device according to claim 9 , wherein the zero dose stop is provided at a proximal end of the dosing member or the zero stop feature is provided at a proximal end of a housing cavity of the housing.
12 . The drug delivery device according to claim 9 , wherein the zero stop feature and the maximum stop feature are provided at a same structural element of the housing, and the structural element comprises a dose thread that threadedly engages with the dosing member.
13 . The drug delivery device according to claim 1 , wherein the drug delivery device comprises a dose definition mechanism configured to define rotational dose positions of the dose setting member with respect to the housing, the dose setting member connected to the housing via a dose selector member, the dose selector member is rotationally fixed and axially movable with respect to the housing, and the dose definition mechanism is configured to act between the dose selector member and the dose setting member.
14 . The drug delivery device according to claim 13 , wherein the dose selector member is connected to the housing via a connection that enables the dose selector member to be mounted to the housing only in rotational orientations that ensure that the dose setting member is set to a dose position upon engagement of the maximum dose stop with the maximum stop feature, and the connection enables a single rotational orientation only.
15 . A Drug delivery device comprising:
a housing with a longitudinal axis;
a dose setting member configured to be actuatable by a user and rotatable around the longitudinal axis to set a dose to be delivered by the drug delivery device;
a piston rod configured to be axially advanced in a proximal direction to deliver the set dose; and
a dosing member configured to define the axial advancement of the piston rod upon delivery of the set dose,
the dosing member being axially movable along the longitudinal axis and rotationally movable around the longitudinal axis during dose setting,
the dosing member being rotationally fixed to the dose setting member during dose setting,
the dosing member comprising a zero dose stop,
the zero dose stop configured to engage with a zero stop feature to limit movement of the dosing member with respect to the housing upon setting a zero dose, and
the zero stop feature being provided at the housing.
16 . The drug delivery device according to claim 1 , wherein the dosing member is threadedly connected to the housing by an outer thread disposed on the dosing member and a corresponding inner thread disposed on the housing.
17 . The drug delivery device according to claim 9 , wherein the zero stop feature and the maximum stop feature are provided at an inner housing, and the inner housing comprises a dose thread that threadedly engages with the dosing member.