Autoinjector

Patent metadata

Field	Value
Publication number	US-11344676-B2
Application number	US-201916507291-A
Country	US
Kind code	B2
Filing date	Jul 10, 2019
Priority date	Nov 6, 2012
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

Described is an autoinjector comprising a case, a door hingedly coupled to the case and having an open position and a closed position, a plunger slidably disposed in the case, and at least one drive spring applying a biasing force on the plunger relative to the case, wherein the door is operably coupled to the plunger, and wherein rotation of the door from the closed position to the open position moves the plunger from a distal position in the case to a proximal position in the case and compresses the at least one drive spring.

First claim

The invention claimed is:

1. An autoinjector comprising:
a case configured to receive a syringe;
a plunger slidably disposed in the case; and
two parallel compression drive springs disposed on opposite sides of the syringe and positioned between a proximal end of the case and a distal end of the plunger, the two parallel compression drive springs respectively defining two axes along which the two parallel compression drive springs are compressible and that are parallel to the needle insertion direction, the two parallel compression drive springs configured to apply a biasing force on the plunger relative to the case, and the plunger being configured to advance the syringe relative to the case and to advance a stopper of the syringe relative to a body of the syringe when the two parallel compression drive springs apply the biasing force on the plunger.

2. The autoinjector of claim 1 , further comprising:
a trigger button disposed on the case and operably coupled to the plunger.

3. The autoinjector of claim 2 , further comprising:
an interlock sleeve slidably disposed in the case and having an extended position and a retracted position relative to the case.

4. The autoinjector of claim 3 , wherein the interlock sleeve comprises at least one interlock beam extending axially in the case.

5. The autoinjector of claim 4 , further comprising:
at least one resilient button locking beam disposed in the case and configured to engage the at least one interlock beam.

6. The autoinjector of claim 5 , wherein the at least one interlock beam is configured to cause the at least one resilient button locking beam to deflect when the interlock sleeve is in the retracted position.

7. The autoinjector of claim 6 , further comprising:
at least one trigger button beam operably coupled to the trigger button, wherein the at least one trigger button beam is configured to abut the at least one resilient button locking beam when the interlock sleeve is in the extended position.

8. The autoinjector of claim 1 , wherein the plunger comprises:
a transverse beam;
a piston rod extending longitudinally from the transverse beam and configured to advance along the longitudinal axis to engage the stopper of the syringe; and
at least one leg extending from the transverse beam and parallel to the piston rod, the at least one leg comprising a distal foot and a ratchet face having a plurality of teeth, the distal foot being configured to support at least one of the two parallel compression drive springs.

9. The autoinjector of claim 8 , further comprising:
at least one resilient tongue disposed in the case and having a hook configured to engage a tooth of the plurality of teeth.

10. The autoinjector of claim 9 , further comprising:
a trigger button; and
at least one trigger button beam disposed in the case, wherein the at least one trigger button beam is configured to cause the at least one tongue from the ratchet face to disengage from the tooth when the trigger button is actuated.

11. The autoinjector of claim 1 , further comprising:
a door hingedly coupled to the case and having an open position and a closed position;
at least one lever hingedly coupled to the door; and
at least one roller rotatably coupled to the lever.

12. The autoinjector of claim 11 , wherein the at least one roller is disposed in a track formed in the case.

13. The autoinjector of claim 1 , further comprising:
a retraction collar configured to engage a needle boot on the syringe.

14. The autoinjector of claim 13 , further comprising:
a door hingedly coupled to the case and having an open position and a closed position; and
at least one lever hingedly coupled to the door, wherein the at least one lever is configured to engage the retraction collar to push the needle boot at least partially through an aperture of an interlock sleeve slidably disposed in the case when the door is rotated from the open position to the closed position.

Assignees

• Sanofi Aventis Deutschland

Inventors

• Henderson Charley
• Cross David
• Jennings Douglas Ivan
• Mcginley Ryan Anthony

Classifications

• A61M5/2033 Primary

  Spring-loaded one-shot injectors with or without automatic needle insertion (multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287) · 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

• A61M2005/202

  cocking means, e.g. to bias the main drive spring of an injector · CPC title

• A61M2205/3368

  Temperature · CPC title

• A61M2205/586

  Ergonomic details therefor, e.g. specific ergonomics for left or right-handed users · CPC title