Safety device for a pre-filled syringe and an injection device

Patent metadata

Field	Value
Publication number	US-9352101-B2
Application number	US-201113997370-A
Country	US
Kind code	B2
Filing date	Dec 30, 2011
Priority date	Jan 4, 2011
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

According to the invention, a safety device for a pre-filled syringe with an injection needle comprises of a support body adapted to mount the pre-filled syringe, a needle shield slidably arranged with respect to the support body, a retention and locking means (M) for retaining and locking the needle shield with respect to the support body in a first and a second advanced position (PA 1 , PA 2 ) and in a retracted position (PR). The needle shield comprises an annular flange adapted to rest on the skin of the patient receiving an injection. The retention and locking means (M) are arranged at a distal end of the safety device.

First claim

The invention claimed is:

1. A safety device for a pre-filled syringe with an injection needle comprising
a support body adapted to mount the pre-filled syringe,
a needle shield slidably arranged with respect to the support body,
a retention and locking mechanism (M) configured to retain and lock the needle shield with respect to the support body in a first and a second advanced position (PA 1 , P A 2 ) and in a retracted position (PR),
wherein the needle shield comprises an annular flange adapted to rest on the skin of the patient receiving an injection and wherein the retention and locking mechanism (M) are arranged at a distal end of the safety device, and
wherein the needle shield is movable from the first advanced position (PA 1 ) to the retracted position (PR) and further to the second advanced position (PA 2 ), wherein the needle shield in the first advanced position (PAI) protrudes the support body in the distal direction by a first distance (D 1 ) and the needle shield in the second advanced position (PA 2 ) protrudes the support body in the distal direction by a second distance (D 2 ), wherein the first distance (D 1 ) is smaller than the second distance (D 2 ).

2. A safety device according to claim 1 , wherein the support body or the needle shield is at least partially made from a transparent plastics material.

3. A safety device according to claim 1 , wherein the retaining and locking mechanism (M) are arranged to releasably retain the needle shield in the first advanced position (PAI) in a manner that is releasable by a linear translatory movement of the needle shield with respect to the support body parallel to a central axis (A) of the safety device.

4. A safety device according to claim 1 , wherein the retention and locking mechanism (M) comprise at least one deflectable resilient arm.

5. A safety device according to claim 4 , wherein the at least one resilient arm is arranged with the needle shield as one piece and is arranged within the needle shield so as to shield the at least one resilient arm from being influenced from the exterior.

6. A safety device according to claim 4 , wherein the at least one resilient arm latches to a catching recess formed to a distal end of the support body to releasably retain the needle shield in the first advanced position (PA 1 ).

7. A safety device according to claim 6 , wherein the at least one resilient arm is pre-tensioned and defected in the radial outward direction when latching to the catching recess to releasably retain the needle shield in the first advanced position (PA 1 ).

8. A safety device according to claim 7 , wherein the at least one resilient arm, when pre-tensioned, unbends due to a material memory effect when the needle shield is released from being retained in the first advanced position (PAI).

9. A safety device according to claim 6 , wherein the at least one resilient arm is stressed and inwardly deflected when the needle shield is in the retracted and in the second advanced position (PA 2 ).

10. A safety device according to claim 9 , wherein the at least one resilient arm is a first resilient arm, the retention and locking mechanism (M) comprises a second deflectable resilient arm, wherein the first resilient arm and the second resilient arm, when stressed and inwardly deflected, arms are locked to each other by interlocking elements of the retaining and locking mechanism (M).

11. A safety device according to claim 10 , wherein two inwardly deflected resilient arms that are arranged opposite to each other are locked to each other by two interjacent interlocking elements arranged opposite to each other in manner that the two inwardly deflected resilient arms and the two interlocking elements form an interlocked structure (S) that comprises an essentially ring-shaped cross-section.

12. A safety device according to claim 1 , wherein the needle shield is biased with respect to the support body in the distal direction by a spring.

13. A safety device according to claim 12 , wherein the spring comprises a spring arm made from a plastics material, wherein the spring arm is attached to the needle shield and engages a first ramp formed to an outer surface of the support body.

14. An injection device (D) comprising:
a pre-filled syringe; and
a safety device comprising:
a support body adapted to mount the pre-filled syringe,
a needle shield slidably arranged with respect to the support body,
a retention and locking mechanism (M) configured to retain and lock the needle shield with respect to the support body in a first and a second advanced position (PA 1 , PA 2 ) and in a retracted position (PR), wherein the retention and locking mechanism (M) are arranged at a distal end of the safety device,
wherein the needle shield comprises an annular flange adapted to rest on the skin of the patient receiving an injection and wherein the retention and locking mechanism (M) are arranged at a distal end of the safety device, and
wherein the needle shield is movable from the first advanced position (PA 1 ) to the retracted position (PR) and further to the second advanced position (PA 2 ), wherein the needle shield in the first advanced position (PAI) protrudes the support body in the distal direction by a first distance (D 1 ) and the needle shield in the second advanced position (PA 2 ) protrudes the support body in the distal direction by a second distance (D 2 ), wherein the first distance (D 1 ) is smaller than the second distance (D 2 ).

15. A safety device according to claim 1 , further comprising an outer body comprising an open distal end and a closed proximal end, wherein a proximal end of the support body is received within the open distal end of the outer body, and wherein the outer body is at least partially made from a transparent plastics material.

Assignees

• Roberts Gareth
• Slemmen John
• Ekman Matthew
• Sanofi Aventis Deutschland

Inventors

• Roberts Gareth
• Slemmen John
• Ekman Matthew

Classifications

• 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

• A61M2005/3267

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

• A61M5/3213 Primary

  Caps placed axially onto the needle, e.g. equipped with finger protection guards (axially-extensible protective sleeves A61M5/3243) · CPC title

• A61M2005/3223

  Means impeding or disabling repositioning of used needles at the syringe nozzle · CPC title

• A61M5/3287

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