AUTO-INJECTOR

• US 20130274671A1
• Filed: 12/21/2011
• Published: 10/17/2013
• Est. Priority Date: 12/21/2010
• Status: Active Grant

• Current Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Original Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Inventors: Jennings, Douglas, Kemp, Thomas, Ekman, Matthew
• Granted Patent: US 9,539,392 B2
• Time in Patent Office: Days
• US Class Current: 604/154
• CPC Class Codes: A61M 2005/208 Release is possible only when device is pushed against the skin, e.g. using a trigger which is blocked or inactive when the device is not pushed against the skin
• CPC Class Codes: A61M 2005/2488 via rotation, e.g. threads or bayonet
• CPC Class Codes: A61M 5/1452 pressurised by means of pistons
• 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 5/3204 Needle cap remover, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices

Abstract

The invention relates to a front-end device of an auto-injector (A) for administering a dose of a liquid medicament, comprising of a support sleeve with a first screw thread adapted to engage a housing of a back-end device of the auto-injector (A) to attach the front-end device to the back-end device and an outer sleeve mounted onto a support sleeve of the front-end device by a second screw thread, wherein the front-end device is adapted to receive a syringe with an injection needle and a barrel containing the dose of the medicament and wherein the direction of rotation of the first screw thread is opposite to the direction of rotation of the second screw thread.

Claims

1-14. -14. (canceled)

15. Front-end device of an auto-injector (A) for administering a dose of a liquid medicament, comprising

a support sleeve with a first screw thread adapted to engage a housing of a back-end device of the auto-injector (A) to attach the front-end device to the back-end device and

an outer sleeve mounted onto a support sleeve of the front-end device by a second screw thread,

wherein the front-end device is adapted to receive a syringe with an injection needle and a barrel containing the dose of the medicament and wherein the direction of rotation of the first screw thread is opposite to the direction of rotation of the second screw thread.

16. Front-end device according to claim 15, characterized in that a syringe retainer adapted to receive the pre-filled syringe is slidably arranged with respect to the support sleeve between a first position (I) with the needle covered inside the support sleeve and a second position (II) with the needle exposed for injection, wherein the outer sleeve is arranged to abut against an assembly lock that comprises a second inward projection arranged to latch to a first flange of the syringe retainer to prevent an axial translation of the syringe retainer in the first position (I) towards the second position (II).

17. Front-end device according to claim 16, characterized in that an annular rib is formed to the support sleeve to limit the axial translation of the syringe retainer in the proximal direction (P) so as to limit a maximal penetration depth of the injection needle.

18. Front-end device according to claim 15, characterized in that a support collar separates the first screw thread from the second screw thread and a latch formed to the outer sleeve is arranged to latch to the support collar of the support sleeve to initially prevent a relative rotation between the outer sleeve and the support sleeve.

19. Front-end device according to claim 18, characterized in that a drive dog is slidably mounted to the support collar and is arranged to abut against the latch, wherein the drive dog is arranged to be engaged by the housing of the back-end device when attached to the support sleeve via the first screw thread and wherein the latch is adapted to be translated by the drive dog engaged by the housing to disengage from the support collar.

20. Front-end device according to claim 15, characterized in that the outer sleeve is connected to at least one clamp arm adapted to clamp to a needle cap covering the injection needle.

21. Front-end device according to claim 20, characterized in that the clamp arm is biased by a clamp spring radially inwards to retain the needle cap within the outer sleeve when the outer sleeve is detached from the support sleeve.

22. Front-end device according to claim 15, characterized in that a needle shroud adapted to rest on the skin of a patient is slidably arranged with respect to the support sleeve, wherein the needle shroud comprises an extension arm adapted to communicate an axial displacement of the needle shroud to the back-end device of the auto-injector (A).