Injection device with dose setting mechanism having maximum dose stop

• US 9,789,259 B2
• Filed: 12/16/2011
• Issued: 10/17/2017
• Est. Priority Date: 12/21/2010
• Status: Active Grant

• Current Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Original Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Inventors: Butler, Joseph, Leak, David Martin
• Primary Examiner(s): Price, Nathan R
• Assistant Examiner(s): Lee, Weng
• Application Number:
  US13/994,628
• Publication Number:
  US 20130267911A1
• Time in Patent Office: 2,132 Days
• Field of Search: 604207, 604208, 604211, 604224
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/582 by tactile feedback
• CPC Class Codes: A61M 5/24 Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic ampoules or carpules A61J1/06
• CPC Class Codes: A61M 5/31541 Means preventing setting of a dose beyond the amount remaining in the cartridge
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member
• CPC Class Codes: A61M 5/31561 using freely adjustable volume steps
• CPC Class Codes: A61M 5/31568 Means keeping track of the total dose administered, e.g. since the cartridge was inserted
• CPC Class Codes: A61M 5/31585 performed by axially moving actuator, e.g. an injection button

Abstract

A dose setting mechanism for a drug delivery device is provided comprising a dose setting member and a further element. Maximum dose stop features are provided on a housing and on the further element.

Claims

1. A dose setting mechanism for a drug delivery device, the mechanism comprising:

a housing comprising an internal helical thread,

a dose setting member comprising an external surface that engages the internal helical thread of the housing such that the dose setting member is movable relative to the housing to set a dose,

a drive sleeve which is at least partially located within the housing and which is moved along a helical path having a rotatory component and a translational component in a first axial direction relative to the housing during dose setting,

a threaded piston rod in threaded engagement with the drive sleeve,

wherein an inner side of the housing and a proximal flange of the drive sleeve define corresponding stops,

wherein the corresponding stops are arranged to abut one another so as to limit the movement of the drive sleeve in the first axial direction during dose setting thereby defining a maximum settable dose, and wherein

the dose setting member and the drive sleeve are decoupled during dose dispensing such that the dose setting member is free to rotate relative to the drive sleeve and

the piston rod is free to rotate relative to the drive sleeve.

2. The dose setting mechanism according to claim 1, wherein the housing has a first protrusion and the drive sleeve has a second protrusion and wherein the distance between the first and second protrusions defines the maximum settable dose.

3. The dose setting mechanism according to claim 1, wherein the dose setting member and the drive sleeve are coupled during dose setting and wherein the dose setting member and the drive sleeve are rotated together during dose setting.

4. The dose setting mechanism according to claim 1, wherein the piston rod is in direct contact with the drive sleeve.

5. The dose setting mechanism according to claim 1, wherein the dose setting member and the piston rod are decoupled during dose dispensing such that the dose setting member and the piston rod are allowed to move relative to each other during dose dispensing.

6. The dose setting mechanism according to claim 1, further comprising a reservoir containing a medicament, preferably insulin, which reservoir is attached to the housing.