ASSEMBLY FOR A DRUG DELIVERY DEVICE AND DRUG DELIVERY DEVICE

• US 20130046248A1
• Filed: 02/02/2011
• Published: 02/21/2013
• Est. Priority Date: 02/02/2010
• Status: Active Grant

• Current Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Original Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Inventors: Raab, Steffen
• Granted Patent: US 9,492,619 B2
• Time in Patent Office: Days
• US Class Current: 604/211
• CPC Class Codes: A61M 5/31541 Means preventing setting of a dose beyond the amount remaining in the cartridge
• CPC Class Codes: A61M 5/31555 by purely axial movement of dose setting member, e.g. during setting or filling of a syringe
• CPC Class Codes: A61M 5/31585 performed by axially moving actuator, e.g. an injection button
• CPC Class Codes: A61M 5/31593 Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir

Abstract

An assembly for a drug delivery device comprises a housing, at least one stop feature and at least one blocking member. For setting a dose of a drug, the stop feature is configured to be rotated in a dose setting direction with respect to the blocking member and with respect to the housing. For delivering the set dose of the drug, the blocking member is configured to be axially displaced with respect to the stop feature away from an axial starting position and towards an axial interaction position. When the blocking member is in the axial starting position, the blocking member is axially offset from the stop feature and, when the blocking member is in the axial interaction position, the blocking member is configured to mechanically cooperate with the stop feature such that rotation of the stop feature in the dose setting direction with respect to the housing is prevented.

Claims

1-15. -15. (canceled)

16. An assembly for a drug delivery device, comprising:

a housing,

at least one stop feature,

at least one blocking member,

a piston rod configured to be axially displaced with respect to the housing for delivering a dose of a drug, wherein blocking member is part of the piston rod,

a rotation member, wherein the stop feature is part of the rotation member and wherein the rotation member is configured to rotate in a dose setting direction with respect to the housing for setting a dose of the drug and to rotate in a dose delivery direction with respect to the housing for delivering the set dose of the drug, and

a drive member which is adapted to follow rotational movement of the rotation member in the dose delivery direction with respect to the housing by mechanical interaction with the rotation member,

wherein for setting the dose of the drug, the stop feature is configured to be rotated in the dose setting direction with respect to the blocking member and with respect to the housing and, for delivering the set dose of the drug, the blocking member is configured to be axially displaced with respect to the stop feature away from an axial starting position and towards an axial interaction position, wherein,

when the blocking member is in the axial starting position, the blocking member is axially offset from the stop feature and, when the blocking member is in the axial interaction position, the blocking member is configured to mechanically cooperate with the stop feature such that rotation of the stop feature in the dose setting direction with respect to the housing is prevented,

characterized in that

the assembly comprises a stop member which is adapted to prevent rotational movement of the drive member in the dose setting direction with respect to the housing by mechanical cooperation with the drive member when the rotation member is rotated in the dose setting direction with respect to the housing.

17. The assembly of claim 16, wherein for delivering the set dose of the drug the blocking member and the stop feature are configured to rotate together in the dose delivery direction with respect to the housing.

18. The assembly of claim 16, wherein the blocking member is secured against rotation in the dose setting direction with respect to the housing as the piston rod is prevented from being rotated in the dose setting direction with respect to the housing such that common rotation of the blocking member and the stop feature in the dose setting direction with respect to the housing is prevented when the blocking member and the stop feature mechanically cooperate with each other.

19. The assembly according to claim 16, wherein the stop feature is configured to be rotated about a stop feature angle in the dose setting direction with respect to the housing for setting a dose of the drug and the blocking member is configured to be rotated about a blocking member delivery angle in the dose delivery direction with respect to the housing when the blocking member is displaced from the axial starting position towards the axial interaction position, and wherein, when the blocking member is in the axial interaction position, the angular distance between the blocking member and the stop feature is less than the stop feature angle.

20. The assembly according to claim 16, wherein the stop feature is configured to be rotated by less than 360 degrees in the dose setting direction with respect to the housing for setting a dose of the drug.

21. The assembly according to claim 16, wherein the blocking member is configured to be rotated by 360 degrees or more in the dose delivery direction with respect to the housing when being displaced from the axial starting position towards the axial interaction position.

22. The assembly according to claim 16, wherein, when the blocking member is out of the axial interaction position, the stop feature is configured to pass an angular position of the blocking member for setting a dose of the drug.

23. The assembly according to claim 16, wherein the axial interaction position is defined by the axial position of the stop feature with respect to the housing.

24. The assembly according to claim 16, wherein the piston rod is configured to be axially displaced with respect to the housing for delivering the set dose of the drug.

25. The assembly according to claim 16, wherein the stop feature radially protrudes from the rotation member and the blocking member radially protrudes from the piston rod.

26. The assembly according to claim 16, wherein, when the blocking member and the stop feature mechanically cooperate in the axial interaction position, completion of a further dose setting action is prevented.

27. The assembly according to claim 24, wherein rotation of the drive member in the dose delivery direction with respect to the housing is converted into axial movement of the piston rod with respect to the housing.

28. The assembly according to claim 24, wherein the drive member and the piston rod are rotationally locked with each other.

29. The assembly according to claim 16, comprising at least two oppositely disposed blocking members.