Assembly for a drug delivery device and drug delivery device

Patent metadata

Field	Value
Publication number	US-9737666-B2
Application number	US-201013504296-A
Country	US
Kind code	B2
Filing date	Nov 1, 2010
Priority date	Nov 3, 2009
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

An assembly for a drug delivery device is disclosed. An example assembly includes 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, the rotation member being adapted to be rotated with respect to the housing in a first rotational direction for delivering a dose of a drug, and
a drive member, the drive member being coupleable to the rotation member for delivering the dose,
at least one correction member,
wherein, 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,
and wherein, 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,
wherein, for switching from the delivery mode into the correction mode, the at least one correction member is moveable with respect to the housing, and wherein the assembly is configured such that movement of the at least one correction member with respect to the housing is converted into a relative movement between the drive member and the rotation member for decoupling the drive member and the rotation member.

2. The assembly of claim 1 , wherein, in a setting mode, the rotation member is adapted to be rotated in a second rotational direction with respect to the drive member for setting the dose of the drug, and wherein, in the delivery mode and in the setting mode, the drive member and the rotation member are coupled to one another by means of a uni-directional friction clutch mechanism, which is configured to prevent relative rotational movement between the rotation member and the drive member during rotation of the rotation member in the first rotational direction and to permit relative rotational movement between the rotation member and the drive member during rotation of the rotation member in the second rotational direction.

3. The assembly of claim 2 , comprising a stop member, wherein the drive member and the stop member are coupled to one another by an other uni-directional friction clutch mechanism, which is configured to permit relative rotational movement between the stop member and the drive member during rotation of the rotation member in the first rotational direction.

4. The assembly of claim 3 , wherein the other uni-directional friction clutch mechanism is configured to prevent relative rotational movement between the stop member and the drive member during rotation of the rotation member in the second rotational direction.

5. The assembly of claim 3 , wherein, for switching into the correction mode, the drive member and the rotation member are moved relatively to each other and with respect to the piston rod for decoupling the rotation member and the drive member and, wherein, when the drive member is moved with respect to the rotation member, the stop member is moved together with the drive member.

6. The assembly according to claim 3 , wherein, in the delivery mode and in the setting mode, the rotation member and the stop member are held in abutment with the drive member by a force provided by a resilient member.

7. The assembly of claim 6 , wherein, for switching into the correction mode, a correction force must be applied acting against the force exerted by the resilient member.

8. The assembly according to claim 1 , comprising a piston rod, wherein the drive member and the piston rod are rotationally locked with each other.

9. The assembly according to claim 1 , wherein at least one of the drive member and the rotation member comprises at least one interaction element, and wherein, for switching into the correction mode, the at least one correction member mechanically interacts with the at least one interaction element to convert movement of the at least one correction member into relative movement between the drive member and the rotation member.

10. The assembly of claim 9 , wherein the at least one interaction element has an oblique outer face, and wherein the at least one correction member exerts a radially directed force onto the at least one interaction element, the force being converted into an axially directed force by mechanical cooperation of the at least one correction member and the oblique outer face.

11. The assembly according to claim 9 , wherein the at least one correction member is secured against rotational movement with respect to the housing and against movement along a main longitudinal axis of the housing, and wherein the at least one correction member and the at least one interaction element axially overlap.

12. The assembly according to claim 1 , wherein the at least one correction member is externally actuatable.

13. The assembly according to claim 1 , wherein the at least one correction member is a resilient member or a resiliently mounted member.

14. The assembly according to claim 1 , comprising two equally configured correction members, the correction members being oppositely disposed.

15. A drug delivery device comprising the assembly according to claim 1 , further comprising a cartridge, the cartridge holding a plurality of doses of a drug, wherein the assembly provides a dose correction mechanism allowing for correcting a set dose.

16. The assembly of claim 1 , further comprising a dose member for setting the dose, wherein the at least one correction member is different than the dose member for setting the dose.

17. The assembly of claim 16 , wherein, for switching from the delivery mode into the correction mode, the at least one correction member is moveable radially inward with respect to the housing.

Assignees

• Nzike Philippe
• Raab Steffen
• Dasbach Uwe
• Boeser Uwe
• Bruggemann Ulrich
• Tchouadje Brice Ulrich
• Youmbi Ngatchou Kevin Igor
• Sanofi Aventis Deutschland

Inventors

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

Classifications

• A61M5/31555

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

• A61M2005/2407

  from the rear · CPC title

• A61M5/31585

  performed by axially moving actuator, e.g. an injection button · CPC title

• A61M5/31556

  Accuracy improving means · CPC title

• A61M2205/582

  by tactile feedback · CPC title