Injection devices

Patent metadata

Field	Value
Publication number	US-9302054-B2
Application number	US-201013318392-A
Country	US
Kind code	B2
Filing date	Apr 30, 2010
Priority date	May 1, 2009
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

An injection device includes a multi-use drive assembly 10 and a single use disposable syringe assembly 12 releasably connected thereto. The syringe assembly includes a syringe 18 and a shield 26 mounted for telescopic movement. The drive assembly 10 is operable to extend the syringe 18 relative to the shield 26 and then to express a dose. Continued forward drive movement extends the shield 26 to re-cover the syringe needle 22 and then ejects the spent syringe assembly 12 in a safe (shrouded) condition.

First claim

The invention claimed is:

1. A syringe assembly comprising:
a syringe having a syringe body and a needle extending from a distal-most application end of the syringe body; and
a shield slideably mounted around the syringe body for telescopic movement between a retracted position in which the syringe needle is exposed in use and an extended position in which the needle is at least partially shrouded by the shield,
wherein the shield is provided with a longitudinal control slot extending in a longitudinal direction along the shield, and the syringe body is provided with a projection which cooperates with the longitudinal control slot on the shield to control relative longitudinal movement of the syringe along the shield,
wherein the projection slidably engages the slot to control the relative longitudinal movement of the syringe along the shield,
wherein the control slot is provided with a latch recess configured to releasably retain the projection,
wherein the wall of the slot, at least in the region of the latch recess, is resiliently deformable to allow the projection to snap out of the latch recess to allow the shield to move rearwardly relative to the syringe, and
the syringe assembly further comprises a locking member engageable adjacent or near the control slot to inhibit resilient movement of the latch recess to prevent release of the projection.

2. The syringe assembly according to claim 1 , wherein the syringe assembly is configured to be releasably coupled in use to the drive assembly of an autoinjector device, the drive assembly including a drive adapted in use to express a dose from the syringe, and
wherein the syringe assembly is coupled to the drive assembly in use by interengagement of a portion of the shield with the drive assembly.

3. The syringe assembly according to claim 2 , wherein the shield includes one or more features for snap engagement in use with an associated one or more features on the drive assembly.

4. The syringe assembly according to claim 2 , wherein, in use, the drive is adapted to uncouple the shield from the drive assembly on approaching or reaching the forwardmost extent of movement.

5. The syringe assembly according to claim 1 , wherein the locking member carries at its forward end a cap configured to close the forward end of the shield, when applied to the forward end of the shield, and with the locking member slid longitudinally into the locking slot.

6. The syringe assembly according to claim 5 , wherein the syringe includes a boot covering the needle prior to use, and
the cap includes means for engaging said boot when the cap is applied to the shield, such that removal of the cap removes the boot.

7. An autoinjection device comprising:
a syringe assembly as claimed in claim 1 , the needle carrying a boot prior to injection;
a drive assembly configured to expel a dose from the syringe, the drive assembly including
a drive,
a trigger configured to actuate the drive assembly, and
a safety arrangement configured to prevent inadvertent actuation of the drive assembly in a locked position; and

a boot remover applied to the forward end of the autoinjector and adapted to engage the boot, the boot remover being configured to
(i) prevent movement of the syringe relative to the shield in at least one direction, and
(ii) prevent release of the safety arrangement of the drive assembly when the boot is in place on the needle,
wherein removal of the boot remover from a distal application end of the autoinjection device enables the safety arrangement of the drive assembly to be unlocked to allow actuation of the drive assembly.

8. The autoinjection device according to claim 7 , wherein the boot remover includes a boot removal finger.

9. The syringe assembly according to claim 1 , wherein the syringe body and the longitudinal slot are made of molded plastics material.

10. The syringe assembly according to claim 1 , wherein the longitudinal slot and the projection cooperate to limit the extent of telescopic movement of the syringe and the shield.

11. The syringe assembly according to claim 1 , wherein the longitudinal slot and the projection are operable releasably to latch the shield in a forward position relative to the syringe.

12. The syringe assembly according to claim 1 , wherein said locking member is engageable by being longitudinally slideable into a locking slot provided alongside said control slot.

13. The syringe assembly according to claim 1 , wherein the syringe assembly is adapted to be releasably coupled in use to a drive assembly of an autoinjection device, the drive assembly including a drive configured to expel a dose from the syringe, a trigger configured to release the drive, and a safety arrangement configured to prevent inadvertent actuation of the drive, and
wherein the locking member releases the safety arrangement and/or unlocks the safety arrangement for subsequent release, when the locking member is removed from the shield.

14. The syringe assembly according to claim 1 , wherein the syringe is carried inside the shield by direct sliding engagement therebetween.

15. An autoinjection device comprising a removable syringe assembly according to claim 1 .

Assignees

• Eaton Mark
• Marshall Jeremy
• Owen Mumford Ltd

Inventors

• Eaton Mark
• Marshall Jeremy

Classifications

• A61M2005/3151

  by friction · CPC title

• A61M2005/206

  With automatic needle insertion · CPC title

• A61M5/3272

  having projections following labyrinth paths · CPC title

• A61M5/31513

  Piston constructions to improve sealing or sliding · CPC title

• A61M5/31571

  Means preventing accidental administration (for automatic syringes A61M5/20) · CPC title