Assembly for a drug delivery device and drug delivery device

Patent metadata

Field	Value
Publication number	US-9974906-B2
Application number	US-201615370916-A
Country	US
Kind code	B2
Filing date	Dec 6, 2016
Priority date	Nov 3, 2009
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

An assembly for a drug delivery device comprises a housing, a rotation member, a drive member and at least one correction member. The rotation member is adapted to be rotated with respect to the housing in a first rotational direction for delivering a dose of a drug. The drive member is coupleable to the rotation member for delivering the dose. In a delivery mode, the drive member and the rotation member are coupled such that the drive member follows rotational movement of the rotation member in the first rotational direction due to mechanical interaction of the rotation member and the drive member. In a correction mode, the rotation member and the drive member are decoupled such that the rotation member is rotatable in the first rotational direction with respect to the drive member.

First claim

The invention claimed is:

1. An assembly for a drug delivery device, comprising:
a housing;
a rotation member rotatable with respect to the housing;
a drive member rotatable with respect to the housing and coupled to the rotation member by a first unidirectional clutch mechanism; and
a first member movable with respect to the housing between a first position and a second position,
wherein when the first member is in the first position, the rotation member and the drive member are rotationally coupled and
a rotational movement of the rotation member in a first rotational direction causes a rotational movement of the drive member in the first rotational direction for delivering a dose of a drug, and
wherein, when the first member is moved from the first position into the second position, the first member uncouples the rotation member and the drive member,
such that, when the first member is in the second position, the rotation member and the drive member are rotationally uncoupled
such that a rotational movement of the rotation member in the first rotational direction for correcting a set dose does not cause a rotational movement of the drive member in the first rotational direction.

2. The assembly of claim 1 , further comprising a dose member axially movable with respect to the housing, the rotation member being coupled to the dose member, and axial movement of the dose member with respect to the housing in a first axial direction causing rotational movement of the rotation member in the first rotational direction.

3. The assembly of claim 2 ,
wherein when the first member is in the first position, axial movement of the dose member with respect to the housing in a second axial direction causes rotational movement of the rotation member in a second rotational direction for setting the set dose without causing rotational movement of the drive member.

4. The assembly of claim 1 ,
wherein when the first member is in the first position, the first unidirectional clutch mechanism prevents relative rotational movement between the rotation member and the drive member during rotation of the rotation member in the first rotational direction and permits relative rotational movement between the rotation member and the drive member during rotation of the rotation member in the second rotational direction.

5. The assembly of claim 1 , further comprising a stop member that is rotationally locked with respect to the housing.

6. The assembly of claim 5 ,
wherein when the first member is in the first position, the stop member prevents relative rotational movement of the drive member with respect to the housing due to the rotational movement of the rotation member in the second rotational direction.

7. The assembly of claim 5 , further comprising a second unidirectional clutch mechanism,
wherein when the first member is in the first position, the second unidirectional clutch mechanism prevents relative rotational movement between the stop member and the drive member during the rotation of the rotation member in the second rotational direction.

8. The assembly of claim 7 ,
wherein the second unidirectional clutch mechanism permits relative rotational movement between the stop member and the drive member during the rotation of the rotation member in the first rotational direction.

9. The assembly of claim 5 , further comprising a resilient member providing an axial force that biases the drive member into mechanical engagement with the stop member.

10. The assembly of claim 9 , wherein
the resilient member provides an axial force that biases the drive member into mechanical engagement with the rotation member.

11. The assembly of claim 1 , wherein the dose member is threadedly engaged with the rotation member.

12. The assembly of claim 1 , wherein the dose member is rotationally-locked with the housing.

13. The assembly of claim 1 , further comprising a piston rod.

14. The assembly of claim 13 , wherein the drive member is rotationally-locked with the piston rod.

15. The assembly of claim 13 , wherein the piston rod comprises a rotating piston rod.

16. The assembly of claim 1 ,
wherein movement of the first member from the first position to the second position allows relative axial movement between the rotation member and the drive member.

17. The assembly of claim 1 ,
wherein either the rotation member or the drive member comprises an interaction element.

18. The assembly of claim 17 ,
wherein the first member mechanically interacts with the interaction element during the movement of the first member from the first position to the second position,
thereby allowing a relative axial movement between the rotation member and the drive member.

19. The assembly of claim 17 ,
wherein the interaction element comprises an outer face, and
wherein the first member exerts a radially directed force onto the interaction element during the movement of the first member from the first position to the second position.

20. The assembly of claim 19 ,
wherein the radially directed force is converted into an axially directed force by a mechanical cooperation of the first member and the oblique outer face.

21. The assembly of claim 17 ,
wherein the first member comprises a first portion arranged at an outer surface of the housing and a second portion protruding radially inward with respect to the housing, and
wherein the second portion exerts the radially directed force onto the interaction element.

22. The assembly of claim 17 ,
wherein the first member is secured against movement along a main longitudinal axis of the housing, and
wherein the first member and the interaction element axially overlap.

23. The assembly of claim 21 ,
wherein movement of the first member from the first position to the second position creates a corrective axial force that opposes the axial force provided by the resilient member,
causing relative axial movement between the rotation member and the drive member.

24. The assembly of claim 1 ,
wherein the first member comprises a first portion arranged at an outer surface of the housing and a second portion protruding radially inward with respect to the housing.

25. The assembly of claim 1 , further comprising a second member.

26. The assembly of claim 25 ,
wherein the first member and the second member are oppositely disposed.

27. The assembly of claim 1 ,
wherein the first unidirectional clutch mechanism comprises a friction clutch mechanism.

28. A drug delivery device, comprising:
a cartridge holding a plurality of doses of a drug; and
an assembly for correcting a set dose of the drug, the assembly comprising:
a housing;
a dose member axially moveable with respect to the housing,
a rotation member rotatable with respect to the housing and coupled to the dose member,
a drive member rotatable with respect to the housing, and
a first member movable with respect to the housing between a first position and a second position,

wherein when the first member is in the first position, the rotation member and the drive member are rotationally coupled and axial movement of the dose member with respect to the housing in a first axial direction causes rotational movement of the rotation member and the drive member in a first rotational direction for delivering a dose of the drug, and
wherein,
when the first membe

Assignees

• Sanofi Aventis Deutschland
• Youmbi Ngatchou Kevin Igor

Inventors

• Nzike Philippe Bertrand
• Raab Steffen
• Dasbach Uwe
• Boeser Uwe
• Bruggemann Ulrich

Classifications

• A61M2205/581

  by audible feedback · CPC title

• A61M5/31555

  by purely axial movement of dose setting member, e.g. during setting or filling of a syringe · CPC title

• A61M5/31535 Primary

  Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose · CPC title

• A61M5/31556

  Accuracy improving means · CPC title

• A61M2205/582

  by tactile feedback · CPC title