Auto-injector with a delay system

Patent metadata

Field	Value
Publication number	US-2018154084-A1
Application number	US-201615578341-A
Country	US
Kind code	A1
Filing date	Jun 2, 2016
Priority date	Jun 5, 2015
Publication date	Jun 7, 2018
Grant date	—

Abstract

An autoinjector comprising:
a body ( 1 ) receiving a reservoir (S), said reservoir (S) containing fluid and including a piston (P), such as a pre-filled syringe; a piston rod ( 5 ) that is adapted to co-operate with the piston (P) of said reservoir (S), said piston rod ( 5 ) being movable by an injection spring ( 8 ) between a primed position and an injection position in which said piston rod ( 5 ) has moved the piston (P) of the reservoir (S) so as to inject the fluid into an injection site; and a visual, audible, and/or tactile indicator device for indicating to the user that said autoinjector may be removed from said injection site;

said autoinjector including a retarding system for delaying the actuation of said visual, audible and/or tactile indicator device relative to the end of injection, said retarding system including a dashpot ( 16 ) containing a fluid, a piston ( 19 ) being arranged in said dashpot ( 16 ), one of said dashpot ( 16 ) and of said piston ( 19 ) being movable in translation in said body ( 1 ) during actuation of said retarding system, and the other of said dashpot ( 16 ) and of said piston ( 19 ) being stationary relative to said body ( 1 ) during actuation of said retarding system, the movement in translation of one relative to the other moving said fluid out from said dashpot ( 16 ) through at least one flow passage ( 161; 195 ), such that said movement in translation is braked, said retarding system comprising said dashpot ( 16 ) containing said fluid, said piston ( 19 ), a locking key ( 20 ), said injection spring ( 8 ), a pusher element ( 17 ), a support member ( 6 ) interposed between said pusher element ( 17 ) and said injection spring ( 8 ), and said piston rod ( 5 ).

First claim

1 - 12 . (canceled)

13 . An autoinjector comprising:
a body receiving a reservoir, said reservoir containing fluid and including a piston, such as a pre-filled syringe; a piston rod that is adapted to co-operate with the piston of said reservoir, said piston rod being movable by an injection spring between a primed position and an injection position in which said piston rod has moved the piston of the reservoir so as to inject the fluid into an injection site; and a visual, audible, and/or tactile indicator device for indicating to the user that said autoinjector may be removed from said injection site; said autoinjector being characterized in that it includes a retarding system for delaying the actuation of said visual, audible and/or tactile indicator device relative to the end of injection, said retarding system including a dashpot containing a fluid, a piston being arranged in said dashpot, one of said dashpot and of said piston being movable in translation in said body during actuation of said retarding system, and the other of said dashpot and of said piston being stationary relative to said body during actuation of said retarding system, the movement in translation of one relative to the other moving said fluid out from said dashpot through at least one flow passage, such that said movement in translation is braked, said retarding system comprising said dashpot containing said fluid, said piston, a locking key, said injection spring, a pusher element, a support member interposed between said pusher element and said injection spring, and said piston rod, said locking key comprising a head, a longitudinal rod, and an endpiece that is adapted to co-operate with the piston rod, said head of the locking key being in its blocking position before triggering the retarding system, in which position it co-operates with a recess of said pusher element, said piston rod, when it arrives towards its end-of-injection position, co-operating with the endpiece of the locking key so as to pull said locking key axially downwards out from its blocking position, such that said pusher element is thus no longer prevented from moving in translation by said locking key.

14 . The autoinjector according to claim 13 , wherein, during actuation of said retarding system, said piston is movable in translation in said body, and said dashpot is stationary.

15 . The autoinjector according to claim 14 , wherein, during actuation of said retarding system, said dashpot is prevented from moving in translation by a second frustoconical or sloping wall portion of said body that co-operates with at least one flexible tab of said dashpot, said piston, during actuation of said retarding system, preventing said flexible tabs from deforming radially inwards.

16 . The autoinjector according to claim 15 , wherein, after actuating said retarding system, said piston is moved axially relative to said at least one flexible tab of said dashpot and no longer prevents it from deforming radially inwards, such that said dashpot is no longer prevented from moving in translation in said body.

17 . The autoinjector according to claim 13 , wherein said at least one flow passage is formed by an axial groove in the dashpot.

18 . The autoinjector according to claim 13 , wherein said at least one flow passage is formed by a central hole in the piston.

19 . The autoinjector according to claim 13 , wherein said pusher element is axially movable in said body and co-operates with said piston, such that an axial movement of said pusher element causes an axial movement of said piston in said dashpot.

20 . The autoinjector according to claim 13 , wherein said pusher element includes flexible tabs that, before actuation of the retarding system, co-operate with a first frustoconical or sloping wall of the body, the head of the locking key, in its blocking position, preventing said flexible tabs from deforming radially inwards.

21 . The autoinjector according to claim 13 , wherein said autoinjector includes an actuator sleeve that includes a contact end for coming into contact with the user's body, said actuator sleeve extending inside said body at least in part, and being movable relative to said body between projecting positions in which said actuator sleeve projects out from said body at least in part, and an actuated position in which said actuator sleeve is moved axially into said body, said actuator sleeve being in a first projecting position before actuation of the autoinjector, and in a second projecting position after actuation of the autoinjector.

22 . The autoinjector according to claim 13 , wherein said reservoir includes a needle through which said fluid is injected into said injection site.

Assignees

• Aptar France Sas

Inventors

• Fabien David
• Gomez Thomas
• Saussaye Anthony
• His Olivier

Classifications

• A61M5/20 Primary

  Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically (A61M5/142 {, A61M5/46} take precedence; {hypodermic projectiles F42B12/54}) · CPC title

• A61M2005/2013

  triggering of discharging means by contact of injector with patient body · CPC title

• A61M2005/2086

  having piston damping means, e.g. axially or rotationally acting retarders · CPC title

• A61M2205/581

  by audible feedback · CPC title

• A61M2205/582

  by tactile feedback · CPC title