Injection Device

• US 20100016793A1
• Filed: 05/29/2007
• Published: 01/21/2010
• Est. Priority Date: 06/01/2006
• Status: Active Grant

• Current Assignee: Cilag Gmbh International (Johnson & Johnson)
• Original Assignee: Cilag Gmbh International (Johnson & Johnson)
• Inventors: Brady, Matthew James, Barrow-Williams, Timothy Donald, Jennings, Douglas Ivan, Corrigan, Joseph Peter
• Granted Patent: US 9,072,833 B2
• Time in Patent Office: Days
• US Class Current: 604/134
• 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 39/162 with antiseptic agent incorporated within the connector
• 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 5/3202 Devices for protection of the needle before use, e.g. caps A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001
• 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

Abstract

An injection device 110 is described having a housing 112 that receives a syringe 114 having a needle 118, wherein the syringe is supported in a syringe carrier 150. The injection device 110 has a removable cap 190. The syringe 114 and syringe carrier 150 are biased by a return spring 126 from an extended position in which the needle 118 extends from the housing 112 through an exit aperture 128 to a retracted position in which it does not. The syringe carrier 150 abuts a surface inside the removable cap 190 which prevents forward movement of the syringe carrier 150 when the cap is in place. The injection device is less prone to failure than prior art devices and is safer should failure occur.

Claims

1. An injection device comprising:

a housing adapted to receive a syringe having a reservoir portion and a discharge nozzle, so that the syringe is movable between a retracted position in which the discharge nozzle is contained within the housing and an extended position in which the discharge nozzle extends from the housing through an exit aperture;

a drive that acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle;

a removable cap adapted to be connected to the housing for closing the exit aperture; and

a syringe carrier for carrying the syringe as it is advanced,

wherein the removable cap is adapted to restrict movement of the syringe carrier in a direction towards the exit aperture when the removable cap is connected to the housing.

2. An injection device according to claim 1, wherein the cap provides a first interface for restricting movement of the syringe carrier in a direction towards the exit aperture.

3. An injection device according to claim 2, wherein the syringe carrier provides a second interface for engaging the first interface.

4. An injection device according to claim 3, wherein the first interface and second interface each comprise a planar surface.

5. An injection device according to any one of claims 2 to 4, wherein the first interface is located at an edge of on an annular component within the cap.

6. An injection device according to claim 5, wherein the annular component is adapted to extend into the exit aperture when connected to the housing.

7. An injection device according to claim 6, wherein the annular component is adapted to grip a removable shield on the discharge nozzle of the syringe.

8. An injection device according to any preceding claim, wherein the syringe carrier comprises a sheath for surrounding the reservoir portion of the syringe, wherein the sheath has a first internal diameter along its length, and an intermediate section with a second internal diameter which is smaller than the first internal diameter so that the first end of the sheath is adapted to support the syringe between the reservoir portion and the discharge nozzle.

9. An injection device according to claim 8, wherein the second interface is located-on an annular protrusion at the first end of the syringe carrier which extends over the discharge nozzle.

10. An injection device according to claim 9, wherein the annular protrusion is a split annular protrusion.

11. An injection device according to claim 10, further comprising:

a sliding sleeve projecting from the exit aperture; and

at least one locking arm which is engageable with the split annular protrusion, wherein the at least one locking arm disengages from the split annular protrusion on movement of the sliding sleeve into the injection device.

12. The injection device of claim 11, wherein the annular protrusion is split on diametrically opposing sides of the protrusion, and wherein each split in the protrusion comprises a locking surface for contacting with a corresponding locking arm.

13. An injection device according to any preceding claim further comprising means for biasing the syringe from its extended position to its retracted position.

14. An injection device according to claim 13, further comprising a support for carrying the means for biasing the syringe.

15. An injection device substantially as hereinbefore described with reference to and as shown in the attached drawings.