Automatic injection device with a top release mechanism

• US 9,108,002 B2
• Filed: 12/15/2011
• Issued: 08/18/2015
• Est. Priority Date: 01/21/2005
• Status: Active Grant

• Current Assignee: Novo Nordisk A/S
• Original Assignee: Novo Nordisk A/S
• Inventors: Markussen, Tom Hede
• Primary Examiner(s): BOUCHELLE, LAURA A
• Application Number:
  US13/326,738
• Publication Number:
  US 20120083746A1
• Time in Patent Office: 1,342 Days
• Field of Search: 604134-139, 604151-153, 604/187, 604207-211
• US Class Current: 1/1
• CPC Class Codes: A61M 2005/202 cocking means, e.g. to bias the main drive spring of an injector
• CPC Class Codes: A61M 2005/3126 Specific display means related to dosing
• CPC Class Codes: A61M 5/20 Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically A61M5/142 , A61M5/46 take precedence; hypodermic projectiles F42B12/54
• 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 5/31525 Dosing burettes, pipettes B01L3/02
• CPC Class Codes: A61M 5/31528 by means of rotational movements, e.g. screw-thread mechanisms
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member
• CPC Class Codes: A61M 5/31553 without 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 a handheld mechanical injection device by which set doses of a liquid medicament can be injected from a medical reservoir. The medicament is expelled through an injection needle by release of a power reservoir in the device, the power reservoir being fully or partially released by actuation of a user operable release member being positioned at or near an upper end of the injection device, the upper end being that end of the injection device which is opposite the injection needle.

Claims

1. A handheld injection device, comprising:

a rotatable dose setting member that is rotatable about a longitudinal axis of a housing of the injection device;

a power reservoir, comprising a torsion spring for storing energy to expel a dose from the injection device;

a piston rod;

a release member, located at the most proximal portion of the device, opposite an end of the device wherein a needle may be mounted;

the injection device, further comprising a rotatably arranged multi-component driver (36, 37, 38) having at least a part (38) that at least partly engages with at least part of a drive track of an associated piston rod, and a further part (36) being axially movable into a position disconnected from the housing thus releasing energy accumulated in the power reservoir, the further part (36) being axially movable by the user applying a force onto a generally planar surface of the release member, wherein the generally planar surface is generally perpendicular to a longitudinal direction of the piston rod in the device.

2. An injection device comprising:

a housing;

a drive member;

a piston rod having a longitudinal direction;

a torsion spring for storing energy to drive a dose from the injection device;

a drive mechanism converting relative rotational motion into axial movement of the piston rod;

a release button located at the most proximal end of the device, opposite an end of the device wherein a needle may be mounted, the release button having a generally planar surface that is generally perpendicular to the longitudinal direction of the piston rod.