AUTO-INJECTOR

• US 20130317430A1
• Filed: 02/16/2012
• Published: 11/28/2013
• Est. Priority Date: 02/18/2011
• Status: Active Grant

• Current Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Original Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Inventors: Brereton, Simon Francis, Kemp, Thomas, Burnell, Rosie, Ekman, Matthew
• Granted Patent: US 9,925,344 B2
• Time in Patent Office: Days
• US Class Current: 604/117
• CPC Class Codes: A61M 2005/206 With automatic needle insertion
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/582 by tactile feedback
• CPC Class Codes: A61M 2205/583 by visual feedback
• 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 5/2033 Spring-loaded one-shot injectors with or without automatic needle insertion multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287
• CPC Class Codes: A61M 5/3157 Means providing feedback signals when administration is completed A61M5/20 takes precedence
• CPC Class Codes: A61M 5/326 Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
• CPC Class Codes: A61M 5/46 having means for controlling depth of insertion

Abstract

An auto-injector for administering a dose of a liquid medicament (M) is present having a tubular chassis telescopable in a tubular case, a carrier subassembly comprising a tubular carrier slidably arranged relative to the chassis inside the case, where the carrier is adapted to contain a syringe with a hollow injection needle. The injector also has a drive spring and a plunger for forwarding load of the drive spring to a stopper of the syringe, wherein the syringe is lockable for joint axial translation with the carrier. A control spring is arranged around the carrier for translating the carrier in a proximal direction (P) for insertion of the needle through the chassis into an injection site.

Claims

1-15. -15. (canceled)

16. An auto-injector for administering a dose of a liquid medicament (M), comprising:

a tubular chassis telescopable in a tubular case,

a carrier subassembly comprising a tubular carrier slidably arranged relative to the chassis inside the case, the carrier adapted to contain a syringe with a hollow injection needle, a drive spring and a plunger for forwarding load of the drive spring to a stopper of the syringe, wherein the syringe is lockable for joint axial translation with the carrier,

a control spring arranged around the carrier for translating the carrier in a proximal direction (P) for insertion of the needle through the chassis into an injection site,

wherein the control spring is arranged to bias the case against the chassis in a distal direction (D) so as to extend the chassis out of a proximal end (P) of the case, wherein an insertion depth of the needle is defined by the carrier abutting the chassis in a predefined position, wherein the case is arranged to release or allow release of the control spring for needle insertion on translation of the case in the proximal direction (P) relative to the chassis against the bias into an advanced position.