Injection device with needle shield

Patent metadata

Field	Value
Publication number	US-9789264-B2
Application number	US-201414538331-A
Country	US
Kind code	B2
Filing date	Nov 11, 2014
Priority date	Jul 2, 2010
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

According to the invention, an injection device (D) comprises a pre-filled syringe and a safety device. The pre-filled syringe comprises a barrel with an inner cavity in fluid communication with a hypodermic needle attached to a distal end of the pre-filled syringe and a piston fluid-tightly sealing a proximal end of the inner cavity. The safety device comprises a support body for retaining the pre-filled syringe therein, an outer body operably connected to the piston, a needle shield and a releasable retaining means (R). The retaining means comprises a radial projection and a longitudinal recess adapted to receive the radial projection. The radial projection is connected to or integral part of one of the support body or the outer body and a longitudinal recess formed into the other of the support body or the outer body. The needle shield, the support body and the outer body are telescopable relative to each other. The piston is movable in a distal direction to expel a medicament contained in the inner cavity through the hypodermic needle by a manual actuation of the outer body. A telescoping movement of the outer body with respect to the support body is restricted by the retaining means (R) when the needle shield is moved with respect to the support body in a proximal direction from an initial position (I) towards a retracted position (II). The retaining means (R) is released when the needle shield reaches the retracted position (II) allowing for a telescoping movement of the outer body with respect to the support body to expel the medicament contained in the pre-filled syringe through the hypodermic needle.

First claim

The invention claimed is:

1. An injection device comprising
a syringe pre-filled with medicament comprising,
a barrel;
a needle having a distal end and a proximal end, the proximal end attached to a distal end of the syringe; and
a sliding piston sealing a proximal end of the barrel,

where the syringe is contained within an assembly comprising a support body, a needle shield and an outer body, where the assembly is configured to transform from a first stage to a second stage to a third stage during a process where the medicament is expelled from the barrel of the syringe through the needle,
where the outer body,
is operably connected to the piston;
is rotatably fixed relative to the support body; and
is configured to engage a flap on the support body when the assembly transforms from the first stage to the second stage causing the flap to engage and unlatch a detent on the needle shield,

where the needle shield,
has a distal opening that is axially positioned relative to the distal end of the needle such the distal end of the needle protrudes outwardly of the distal opening exposing the needle when the assembly is in the first stage and in the second stage, where the distal opening covers the distal end of the needle when the assembly is in the third stage;
is biased in a distal direction such that the needle shield telescopably extends relative to the support body as the assembly transforms from the second stage to the third stage; and
is permanently locked axially in an extended positioned through engagement of a radial protrusion on the needle shield with a lateral separator located in a guide track on the support body when the assembly is in the third stage.

2. An injection device according to claim 1 , where a piston rod connected to the piston abuts the outer body or is integral with the outer body as one piece.

3. An injection device according to claim 1 , where the radial protrusion contains a notch that engages and permanently retains the lateral separator when the assembly is in the third stage.

4. An injection device according to claim 1 , where the needle shield is releasably retained in a retracted position by the detent being flexibly engaged with a distal end of the support body when the assembly is in the first stage.

5. An injection device according to claim 1 , where the needle shield is biased in a distal direction by a spring engaged on one end with the needle shield and on another end with the support body.

6. An injection device according to claim 1 , where the distal opening is configured with a skin-contact flange.

7. An injection device according to claim 1 , where the flap is pressed radially inwardly by an inside distal end of the outer body as the assembly is transformed to the second stage.

8. An injection device according to claim 7 , where the radially inward movement of the flap simultaneously causes inward radial flexing of the detent disengaging the detent from a retained positioned with the support body.

9. An injection device according to claim 5 where the spring is a compression spring and is in a compressed state when the assembly is in the first and second stages and is in a relaxed state when the assembly is in the third stage.

10. An injection device according to claim 1 , where the radial protrusion is located proximal of the lateral separator when the assembly is in the second stage and slides within the guide track as the assembly transforms from the second stage to the third stage.

11. An injection device according to claim 1 , where the outer body is telescopably arranged with and is rotatably fixed relative to the support body through engagement of a longitudinal tongue with an inner surface of the outer body.

Assignees

• Sanofi Aventis Deutschland

Inventors

• Roberts Gareth
• Ward Chris
• Ekman Matthew

Classifications

• A61M5/3272 Primary

  having projections following labyrinth paths · CPC title

• A61M5/326

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

• A61M5/3202

  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 title

• A61M2005/3267

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