DRIVE ASSEMBLY FOR A DRUG DELIVERY DEVICE AND DRUG DELIVERY DEVICE

• US 20130110054A1
• Filed: 12/06/2010
• Published: 05/02/2013
• Est. Priority Date: 12/07/2009
• Status: Active Grant

• Current Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Original Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Inventors: Raab, Steffen, Dasbach, Uwe
• Granted Patent: US 9,289,560 B2
• Time in Patent Office: Days
• US Class Current: 604/224
• CPC Class Codes: A61M 5/3146 Priming, e.g. purging, reducing backlash or clearance
• CPC Class Codes: A61M 5/31501 Means for blocking or restricting the movement of the rod or piston A61M5/5013 takes precedence
• 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 5/31556 Accuracy improving means
• CPC Class Codes: A61M 5/3156 using volume steps only adjustable in discrete intervals, i.e. individually distinct intervals
• CPC Class Codes: A61M 5/31573 Accuracy improving means
• CPC Class Codes: A61M 5/31575 using scaling up or down transmissions, e.g. gearbox
• CPC Class Codes: A61M 5/31585 performed by axially moving actuator, e.g. an injection button
• CPC Class Codes: A61M 5/31586 performed by rotationally moving or pivoted actuator, e.g. an injection lever or handle
• CPC Class Codes: A61M 5/31593 Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir

Abstract

A drive assembly for a drug delivery device, comprising a housing with a proximal end and a distal end, and a longitudinal axis (A) extending between the proximal end and the distal end, a rotation sleeve being rotatable relative to the housing, and a piston rod being axially moveable relative to the housing. The piston rod is in mechanical cooperation with the rotation sleeve to be rotatable and moveable in the distal direction relative to the housing when the rotation sleeve rotates in a first direction (D1) and to be stationary in axial direction relative to the housing when the rotation sleeve rotates in a second direction (D2) opposite to the first direction (D1).

Claims

1. A drive assembly for a drug delivery device, comprising:

a housing with a proximal end and a distal end, and a longitudinal axis (A) extending between the proximal end and the distal end,

a rotation sleeve being rotatable relative to the housing, and

a piston rod being axially moveable relative to the housing, wherein

the piston rod is in mechanical cooperation with the rotation sleeve to be moveable in the distal direction relative to the housing when the rotation sleeve rotates in a first direction (D1) and to be stationary in axial direction relative to the housing when the rotation sleeve rotates in a second direction (D2) opposite to the first direction (D1).

2. Drive assembly according to claim 1, wherein a drive member is axially moveable relative to the housing, and the rotation sleeve is in mechanical cooperation with the drive member to be rotatable relative to the housing when the drive member is displaced in axial direction relative to the rotation sleeve.

3. Drive assembly according to claim 2, wherein the rotation sleeve rotates in the first direction (D1) relative to the housing when the drive member is displaced in the distal direction, and rotates in the second direction (D2) when the drive member is displaced in the proximal direction.

4. Drive assembly according to claim 2, wherein the drive member and the rotation sleeve are in engagement by a thread.

5. Drive assembly according to claim 1, wherein the rotation sleeve comprises a radial protrusion being arranged in axial direction between two sections of the housing, the two sections preventing an axial movement of the rotation sleeve.

6. Drive assembly according to claim 1, wherein the piston rod has an outer surface provided with at least one guide track arranged on the outer surface, and the rotation sleeve comprises a guide piece being disposed and being movable in the guide track.

7. Drive assembly according to claim 6, wherein the guide track forms a zigzag-like line on the outer surface of the piston rod, the zigzag-like line essentially extending in axial direction.

8. Drive assembly according to claim 6, wherein the guide track comprises first sections and second sections, the first sections being perpendicular relative to the longitudinal axis (A) and the second sections being oblique relative to the longitudinal axis (A).

9. Drive assembly according to claim 8, wherein the first sections are designed to prevent an axial movement of the piston rod and have an extension perpendicular relative to the longitudinal axis (A) which limits the rotational movement of the rotation sleeve.

10. Drive assembly according to claim 8, wherein the second sections are designed to convert rotational movement of the rotation sleeve in the first direction into axial movement of the piston rod.

11. Drive assembly according to one of the claims 8 to 10, wherein the guide track comprises at least one priming section being arranged between one of the first sections and one of the second sections.

12. Drive assembly according to claim 6, wherein the guide track comprises at least one end section being designed to limit the axial movement of the piston rod.

13. Drive assembly according to claim 1, wherein the piston rod is splined to the housing.

15. Drug delivery device with a drive assembly according to claim 1, wherein the drug delivery device comprises a medication containing cartridge and the piston rod interacts with a bung being arranged in the medication containing cartridge to dispense the medication.

14. A drive assembly for a drug delivery device, comprising:

a housing with a proximal end and a distal end, and a longitudinal axis (A) extending between the proximal end and the distal end,

a rotation sleeve being rotatable relative to the housing, and

a piston rod being axially moveable relative to the housing, wherein

the piston rod has an outer surface with a guide track arranged on the outer surface, the rotation sleeve comprises a guide piece being disposed and being movable in the guide track, the guide track and the guide piece being designed to cooperate as a slotted guide.