Safety device for a pre-filled syringe and injection device

Patent metadata

Field	Value
Publication number	US-9604011-B2
Application number	US-201113977447-A
Country	US
Kind code	B2
Filing date	Dec 30, 2011
Priority date	Jan 4, 2011
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

According to the invention, a safety device for a pre-filled syringe comprises
a hollow support body for retaining the pre-filled syringe, a hollow needle shield that is movable relative to the support body from a first position to a second position, releasable mounting means to mount the pre-filled syringe within the support body and a spring means arranged within the support body in a non-energized or only slightly energized state.

The movement of the needle shield from the first position to the second position fully energizes the spring means.

First claim

The invention claimed is:

1. A safety device for a pre-filled syringe, comprising:
a hollow support body for retaining the pre-filled syringe,
a hollow needle shield movable relative to the support body from a first position to a second position,
a releasable mounting member to mount the pre-filled syringe within the support body,
an outer body slidably arranged relative to the support body, wherein, at an end of an injection stroke, the outer body releases the releasable mounting member and substantially receives the support body,
a locking mechanism configured to inhibit movement of the needle shield to the first position when the needle shield is in the second position, the locking mechanism comprising
at least one locking catch configured to protrude from the needle shield into a first recess formed into the support body to retain the needle shield in the first position, and
a second recess formed into the support body, wherein the at least one locking catch is configured to latch to the second recess to irreversibly lock the needle shield in the second position after the needle shield moves from the first position to the second position, and

a spring arranged within the support body in a non-energized or partially energized state, wherein movement of the needle shield from the first position to the second position fully energizes the spring.

2. The safety device according claim 1 , wherein the movement of the needle shield from the first position to the second position causes the safety device to generate an audible feedback indicating that the spring is fully energized.

3. The safety device according to claim 1 , wherein the spring is made from plastics material.

4. The safety device according to claim 1 , wherein, when the outer body releases the releasable mounting member, the safety device generates an audible feedback.

5. The safety device according to claim 1 , wherein the releasable mounting member comprises at least one clamp arm connected or integrated to the support body and adapted to clamp to a collar of the pre-filled syringe.

6. The safety device according to claim 5 , wherein the outer body comprises a release catch that engages a tapered flank of the clamp arm to deflect the at least one clamp arm in a radial outward direction to release the releasable mounting member.

7. The safety device according to claim 5 , wherein the at least one clamp arm connects to the support body at a hinge and comprises an outward projection adapted to be engaged by an inward projection formed to an inner surface of the outer body to pivot the at least one clamp arm about the hinge to release the releasable mounting member.

8. An injection device comprising:
a pre-filled syringe with a hypodermic needle; and
a safety device comprising:
a hollow support body retaining the pre-filled syringe in an advanced position such that the hypodermic needle protrudes beyond a distal end of the support body,
an outer body slidable relative to the support body,
a hollow needle shield movable relative to the support body from a first position to a second position, wherein the hypodermic needle is surrounded by the needle shield in the first position and the hypodermic needle is exposed in the second position,
a releasable mounting member mounting the pre-filled syringe within the support body the releasable mounting member comprising at least one clamp arm connected or integrated to the support body and adapted to clamp to a collar of the pre-filled syringe, wherein a release catch of the outer body is configured to engage a tapered flank of the clamp arm to deflect the at least one clamp arm in a radial outward direction to release the releasable mounting member, and
a spring arranged within the support body in a non-energized or partially energized state, wherein movement of the needle shield from the first position to the second position energizes the spring.

9. The injection device according to claim 8 , wherein the spring engages the collar of the pre-filled syringe to move the pre-filled syringe proximally with respect to the support body.

10. The injection device according to claim 8 , wherein, at an end of an injection stroke, the outer body releases the releasable mounting member and the spring relaxes and moves the pre-filled syringe from the advanced position to a retracted position in which the hypodermic needle is surrounded by the support body.

11. The safety device according to claim 1 , wherein, in the first position, the hollow needle shield is configured to surround a hypodermic needle of the pre-filled syringe, and in the second position, the hollow needle shield is configured to expose the hypodermic needle.

12. The safety device according to claim 1 , wherein the needle shield comprises a surface adapted to rest on a skin of a patient.

13. The safety device according to claim 1 , wherein the needle shield is configured to move from the first position to the second position against a biasing force of the spring, and the spring is in the non-energized or partially energized state in the first position.

14. The injection device according to claim 8 , wherein the movement of the needle shield from the first position to the second position fully energizes the spring.

15. The injection device according to claim 8 , wherein the needle shield is configured to move from the first position to the second position against a biasing force of the spring, and the spring is in the non-energized or partially energized state in the first position.

16. The injection device according to claim 8 , wherein the needle shield comprises a surface adapted to rest on a skin of a patient.

17. The safety device according to claim 8 , further comprising a locking mechanism configured to inhibit movement of the needle shield to the first position when the needle shield is in the second position, the locking mechanism comprising
at least one locking catch configured to protrude from the needle shield into a first recess formed into the support body to retain the needle shield in the first position, and
a second recess formed into the support body, wherein the at least one locking catch is configured to latch to the second recess to irreversibly lock the needle shield in the second position after the needle shield moves from the first position to the second position.

18. A safety device for a pre-filled syringe, comprising:
a hollow support body for retaining the pre-filled syringe,
an outer body slidable relative to the support body,
a hollow needle shield movable relative to the support body from a first position to a second position,
a releasable mounting member to mount the pre-filled syringe within the support body, the releasable mounting member comprising at least one clamp arm connected or integrated to the support body and adapted to clamp to a collar of the pre-filled syringe, and the at least one clamp arm connecting to the support body at a hinge and comprising an outward projection adapted to be engaged by an inward projection formed to an inner surface of the outer body to pivot the at least one clamp arm about the hinge to release the releasable mounting member, and
a spring arranged within the support body in a non-energized or partially energized state, wherein movement of the needle shield from the first position to the second position energizes the spring.

19. The safety device according claim 17 , wherein the movement of the needle shield from the first position to the second position causes the safety device to generate an

Assignees

• Roberts Gareth
• Owen Sioned
• Ekman Matthew
• Sanofi Aventis Deutschland

Inventors

• Roberts Gareth
• Owen Sioned
• Ekman Matthew

Classifications

• A61M5/3257

  Semi-automatic sleeve extension, i.e. in which triggering of the sleeve extension requires a deliberate action by the user, e.g. manual release of spring-biased extension means · CPC title

• A61M2005/3267

  Biased sleeves where the needle is uncovered by insertion of the needle into a patient's body · CPC title

• A61M5/326 Primary

  Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user · CPC title

• A61M5/3204

  Needle cap remover, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices · CPC title

• A61M5/3287

  Accessories for bringing the needle into the body; Automatic needle insertion (A61M5/20, A61M5/31525 take precedence) · CPC title