Automatic Injection Device with Trigger Lock

• US 20110098655A1
• Filed: 06/10/2009
• Published: 04/28/2011
• Est. Priority Date: 06/19/2008
• Status: Abandoned Application

• Current Assignee: Cilag Gmbh International (Johnson & Johnson)
• Original Assignee: Cilag Gmbh International (Johnson & Johnson)
• Inventors: Hogwood, Jonathan, Jennings, Douglas Ivan, Burnell, Rosemary Louise
• Application Number:
  US12/997,592
• Publication Number:
  US 20110098655A1
• Time in Patent Office: Days
• US Class Current: 604/192
• CPC Class Codes: A61J 1/201 having one piercing end
• CPC Class Codes: A61J 1/2096 Combination of a vial and a syringe for transferring or mixing their contents
• CPC Class Codes: A61M 2005/206 With automatic needle insertion
• 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 2005/2086 having piston damping means, e.g. axially or rotationally acting retarders
• 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 5/3204 Needle cap remover, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices
• 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: Y10T 29/49826 Assembling or joining

Abstract

An injection device comprises a housing adapted to receive a syringe having a discharge nozzle, the syringe being moveable in the housing on actuation of the injection device along a longitudinal axis from a retracted position in which the discharge nozzle is contained within the housing and an extended position in which the discharge nozzle of the syringe extends from the housing through an exit aperture. There is an actuator and a drive adapted to be acted upon by the actuator and in turn act upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle. A locking mechanism is moveable from an engaged position in a direction into the housing at the exit aperture into a disengaged position. The locking mechanism is adapted to prevent actuation of the device when it is in its engaged position and permit actuation of the device when it is in its disengaged position. The exit aperture is defined by a rim located on an edge of the housing and the locking mechanism comprises a contact surface which is adapted to extend over or around at least a part of the rim.

Claims

1. An injection device comprising:

a housing adapted to receive a syringe having a discharge nozzle, the syringe being moveable in the housing on actuation of the injection device along a longitudinal axis from a retracted position in which the discharge nozzle is contained within the housing and an extended position in which the discharge nozzle of the syringe extends from the housing through an exit aperture;

an actuator;

a drive adapted to be acted upon by the actuator and in turn act upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle;

a locking mechanism moveable from an engaged position in a direction into the housing at the exit aperture into a disengaged position,

wherein the locking mechanism is adapted to prevent actuation of the device when it is in its engaged position and permit actuation of the device when it is in its disengaged position,

wherein the exit aperture is defined by a rim located on an edge of the housing, and

wherein the locking mechanism comprises a contact surface which is adapted to extend over or around at least a part of the rim.

2. The injection device of claim 1, wherein the locking mechanism further comprises an arm extending from the contact surface into the housing.

3. The injection device of claim 2, wherein the arm extends into the housing through the exit aperture.

4. The injection device of claim 3, wherein the rim of the exit aperture is elliptical or circular and the arm comprises an elliptical or circular cross-section shaped and positioned in such a way that it first within an inner surface of the exit aperture.

5. The injection device of any one of claims 2 to 4, wherein the rim comprises an opening through which the arm extends into the housing.

6. The injection device of any one of claims 2 to 5, wherein the locking mechanism comprises a plurality of arms.

8. The injection device of claim 1, wherein the locking mechanism further comprises a sleeve extending from the contact surface into the housing.

9. The injection device of claim 8, wherein the sleeve is dimensioned to fit within the exit aperture.

10. The injection device of claim 1, wherein the rim of the exit aperture is elliptical or circular and the sleeve comprises an elliptical or circular cross-section shaped and positioned in such a way that it fits within an inner surface of the exit aperture.

11. The injection device of any one of the preceding claims, wherein the contact surface is formed on a first side of a hoop.

12. The injection device of any one of the preceding claims, wherein a second side of the hoop opposite the first side faces the rim of the exit aperture.

13. The injection device of any one of the preceding claims, wherein the second side moves towards the rim when the locking mechanism is moved from its engaged position to its disengaged position.

14. The injection device of any one of the preceding claims, wherein the release mechanism is arranged on the injection device such that an inner radius of the hoop surrounds the rim when the release mechanism is in its disengaged position.

15. The injection device of any one of the preceding claims, further comprising:

a syringe carrier for carrying the syringe as it is advanced and restraining its advancement beyond its extended position, wherein the syringe carrier is adapted to support the syringe;

a latch member adapted to prevent, in an engaged position of the locking mechanism, movement of the syringe carrier relative to the housing and further adapted to permit, in a disengaged position of the locking mechanism, the syringe carrier moving relative to the housing.

16. The injection device of claim 15, wherein the locking mechanism comprises a primary member movable between the engaged position and the disengaged position.

17. The injection device of claim 15 when dependent on any one of claims 2 to 7, wherein the primary member is the arm connected to the contact surface.

18. The injection device of claim 15 when dependent on any one of claim 8 or 9, wherein the primary member is the sleeve connected to the contact surface.

19. The injection device of any one of claims 16 to 18, wherein the primary member includes a latch opening through which the latch member projects before it engages a locking surface on the syringe carrier, the primary member acting as a cam and the latch member as a cam follower, so that movement of the primary member from its engaged position to its disengaged position causes the latch member to disengage from the locking surface.

20. The injection device of claim 19, wherein the latch member includes a ramped surface against which a surface of the primary member acts to disengage it from the locking surface.

21. The injection device of claim 20, wherein the latch member is provided on the housing.

22. The injection device of any one of the preceding claims, further comprising a release mechanism moveable between an unactuated position and an actuated position, wherein the release mechanism is adapted to prevent the actuator acting on the drive when in its unactuated position and permits the actuator to act on the drive when in its actuated position.

23. The injection device of claim 22, wherein the locking mechanism further comprises an interlock member movable between a locking position when the locking mechanism is in its engaged position, at which it prevents movement of the release mechanism from its unactuated position to its actuated position, and a releasing position when the release mechanism is in its disengaged position, at which it allows movement of the release mechanism from its unactuated position to its actuated position.

7. The injection device of claim 7, wherein the locking mechanism comprises a pair of arms.