Pen-type injector

• US 8,021,345 B2
• Filed: 10/08/2010
• Issued: 09/20/2011
• Est. Priority Date: 03/03/2003
• Status: Active Grant

• Current Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Original Assignee: Dca Design International Ltd.
• Inventors: Wimpenny, Steven, Veasey, Robert Frederick, Langley, Christopher Nigel
• Primary Examiner(s): Sirmons; Kevin C
• Assistant Examiner(s): PATEL, SHEFALI DILIP
• Application Number:
  US12/900,725
• Publication Number:
  US 20110028911A1
• Time in Patent Office: 347 Days
• Field of Search: 604/181, 604/187, 604/207, 604/208, 604/209, 604/210, 604/211, 604/218, 604/224
• US Class Current: 604/209
• 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 5/2422 using emptying means to expel or eject media, e.g. pistons, deformation of the ampoule, or telescoping of the ampoule
• 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 5/31511 Piston or piston-rod constructions, e.g. connection of piston with piston-rod A61M5/5066 takes precedence
• CPC Class Codes: A61M 5/31526 by means of stepwise axial movements, e.g. ratchet mechanisms or detents
• CPC Class Codes: A61M 5/31528 by means of rotational movements, e.g. screw-thread mechanisms
• CPC Class Codes: A61M 5/31533 Dosing mechanisms, i.e. setting a dose administrating mechanisms A61M5/31565
• CPC Class Codes: A61M 5/31541 Means preventing setting of a dose beyond the amount remaining in the cartridge
• CPC Class Codes: A61M 5/3155 by rotational movement of dose setting member, e.g. during setting or filling of a syringe
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member
• CPC Class Codes: A61M 5/3156 using volume steps only adjustable in discrete intervals, i.e. individually distinct intervals
• CPC Class Codes: A61M 5/31583 based on rotational translation, i.e. movement of piston rod is caused by relative rotation between the user activated actuator and the piston rod
• 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

The present invention relates to injectors, such as pen-type injectors, that provide for administration of medicinal products from a multidose cartridge and permit a user to set the delivery dose. The injector may include a housing, a cartridge containing medicinal product, the cartridge being retained within the housing, means for selecting a dose of medicinal product to be expelled, and means for expelling the selected dose of medicinal product. The housing may be a unitary housing within which the means for selecting a dose and the means for expelling the selected dose are moveably retained. Alternatively, the injector may include a housing, a piston rod, an insert located in the housing and through which the piston may rotate, a ratchet, a dose dial sleeve, a drive sleeve, a button located on the drive sleeve and rotatable with respect to the drive sleeve, and a clutch which upon depression of the button prevents rotation between the dose dial sleeve and the drive sleeve.

Claims

1. A pen-type injector, comprising:

a housing;

a piston rod having a screw thread;

a cylindrical insert located in the housing, where the insert is rotationally fixed with respect to the housing during dose setting and has a cylindrical portion extending longitudinally in a proximal direction enclosing a portion of the piston rod;

a ratchet to ensure the piston rod only rotates in a single direction;

a dose dial sleeve rotatable with respect to the housing and the insert during dose setting;

a drive sleeve engaged with the piston rod but not rotatable with respect to the piston rod; and

a clutch which controls rotation between the dose dial sleeve and the drive sleeve.

2. An injector according to claim 1, characterized in that an outer surface of the dose dial sleeve includes graphics and wherein the housing is provided with an aperture or window through which a portion of the graphics may be viewed.