AUTO-INJECTION DEVICE WITH NEEDLE PROTECTING CAP HAVING OUTER AND INNER SLEEVES

• US 20110098656A1
• Filed: 05/28/2004
• Published: 04/28/2011
• Est. Priority Date: 09/27/2005
• Status: Active Grant

• Current Assignee: Cilag Gmbh International (Johnson & Johnson)
• Original Assignee: Cilag Gmbh International (Johnson & Johnson)
• Inventors: Burnell, Rosie L., Johnston, David M.
• Granted Patent: US 9,770,558 B2
• Time in Patent Office: Days
• US Class Current: 604/198
• CPC Class Codes: A61M 2005/2013 triggering of discharging means by contact of injector with patient body
• 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 2005/3109 Caps sealing the needle bore by use of, e.g. air-hardening adhesive, elastomer or epoxy resin
• CPC Class Codes: A61M 2005/312 comprising sealing means, e.g. severable caps, to be removed prior to injection by, e.g. tearing or twisting
• CPC Class Codes: A61M 2005/3215 Tools enabling the cap placement
• 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 sealed boot 123 that covers its needle 118. The syringe 114 is 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. A drive spring 130 acts via a drive to advance the syringe 114 from its retracted position to its extended position and discharge its contents through the needle 118 and a return spring 126, brought into play when the drive has reached a nominal return position, restores the syringe 114 to its retracted position. A releasable locking mechanism retains the syringe 114 in its retracted position. A sleeve 119 projects from the exit aperture 128 and can be depressed to release the locking mechanism. A removable threaded cap 111 closes the housing 112, covers the exit aperture 128 and the sleeve 119, thus preventing the locking mechanism from being released, and engages the boot 123 on the syringe 114. When the cap 111 is removed, it takes the boot 123 with it, no longer closes the exit aperture 128 and no longer prevents the locking mechanism from being released. Then, the locking mechanism can be released and the injection cycle begun.

Claims

1. An injection device comprising:

a housing adapted to receive a syringe having a discharge nozzle and having a boot that covers its 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 releasable locking mechanism that retains the syringe in its retracted position; and

a housing closure member that can occupy a first position, in which it locates on the housing and prevents the locking mechanism from being released, and a second position, in which it does not prevent the locking mechanism from being released, the first position of the housing closure member being one in which it engages the boot, so that movement of the housing closure member to its second position results in removal of the boot from the syringe.

2. An injection device according to claim 1 in which the first position of the housing closure member is one in which it closes the exit aperture to the discharge nozzle, and the second position is one in which it does not.

3. An injection device according to claim 1 or claim 2 in which the first position of the housing closure member is one in which it locates on the housing and the second position is one in which it does not.

4. An injection device according to any preceding claim in which the housing closure member is a cap that locates onto the housing.

5. An injection device according to any preceding claim further comprising:

an actuator; and

a drive that is acted upon by the actuator and in turn acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle.

6. An injection device according to claim 5 in which the housing includes means for biasing the syringe from its extended position to its retracted position, further comprising:

a return mechanism, activated when the drive has reached a nominal return position, to release the syringe from the action of the actuator, whereupon the biasing means restores the syringe to its retracted position.

7. An injection device according to claim 5 or claim 6 further comprising a release mechanism operable to release the locking mechanism, thus allowing the syringe to be advanced by the actuator from its retracted position to its extended position, and in which the first position of the housing closure member is one in which it prevents the release mechanism from being operated.

8. An injection device according to claim 7 in which the release mechanism is a primary member movable between locking and releasing positions and in which the first position of the housing closure member is one in which it covers the primary member.

9. An injection device according to claim 8 in which the locking position of the primary member is one in which it projects from the exit aperture and the releasing position is one in which it does not project from the exit aperture or projects from it to a lesser extent.

10. An injection device according to claim 9 or claim 10 in which the primary member is a sleeve.

11. An injection device according to any preceding claim in which the locking mechanism comprises a latch member that is located within the housing and is biased into a position in which it engages a locking surface and the release mechanism acts to move it from that position into a position in which it no longer engages the locking surface.

12. An injection device according to claim 9 or claim 10 in which the locking mechanism comprises a latch member that is located within the housing and is biased into a position in which it engages a locking surface, and the primary member includes a latch opening through which the latch member projects before it engages the locking surface, the primary member acting as a cam and the latch member as a cam follower, so that movement of the primary member from its locking position to its releasing position causes the latch member to disengage from the locking surface.

13. An injection device according to claim 12 in which the latch member includes a ramped surface against which a surface of the primary member acts to disengage it from the locking surface.

14. An injection device according to any one of claims 5-10 further comprising:

a trigger movable from a rest position, in which it causes the drive to be retained in a position corresponding to the retracted position of the syringe, to an active position, in which it no longer causes the drive to be so retained, thus allowing it to be advanced by the actuator and in turn to advance the syringe from its retracted position to its extended position and discharge its contents through the discharge nozzle; and

an interlock member movable between a locking position, at which it prevents movement of the trigger from its rest position to its active position, and a releasing position, at which it allows movement of the trigger from its rest position to its active position, the trigger thereafter being retained in its active position.

15. An injection device according to any one of claims 8-10 further comprising:

a trigger movable from a rest position, in which it causes the drive to be retained in a position corresponding to the retracted position of the syringe, to an operative position, in which it no longer causes the drive to be so retained, thus allowing it to be advanced by the actuator and in turn to advance the syringe from its retracted position to its extended position and discharge its contents through the discharge nozzle; and

an interlock member comprising the primary member, the interlock member being movable between a locking position, at which it prevents movement of the trigger from its rest position to its active position and the primary member projects from the exit aperture, and a releasing position, at which it allows movement of the trigger from its rest position to its active position and the primary member does not project from the exit aperture or projects from it to a lesser extent, the trigger thereafter being retained in its active position.

16. An injection device according to claim 14 or claim 15, in which the trigger comprises a locking member that, in the rest position of the trigger, engages a locking surface of the drive and, in the active position, does not.

17. An injection device according to any one of claims 14-16 in which the trigger and the interlock member include a projection and an aperture, the projection being in register with the aperture when the interlock member is in its releasing position, but not otherwise, thus allowing the trigger to move from its rest position to its active position by movement of the projection into the aperture.

18. An injection device according to claim 17 in which the projection is on the trigger and the aperture is in the interlock member.

19. An injection device according to any one of claims 14-18 in which the trigger and another component of the device include a latching projection and a corresponding latching surface against which the latching projection latches when the trigger is in its active position.

20. An injection device according to claim 19 in which the latching projection is on the trigger.

21. An injection device according to claim 19 or claim 20 in which the said other component of the device is the interlock member.