Auto-injector

Patent metadata

Field	Value
Publication number	US-2022031951-A1
Application number	US-201917277376-A
Country	US
Kind code	A1
Filing date	Sep 19, 2019
Priority date	Sep 20, 2018
Publication date	Feb 3, 2022
Grant date	—

Abstract

An autoinjector having a reservoir (110); a piston (111); a needle (112); a driver module having a body (201); a piston rod (210) movable between rest position and injection positions; an injection spring (220); and a lock that blocks the piston rod in its rest position. The lock ha a thread (230) connected to the piston rod and to a toothed winder wheel (240), a locking member (260) co-operating with a tooth (241) of the toothed winder wheel, the locking member (260) movable between a blocking position preventing the winder wheel from turning in the direction of actuation force (Fa) exerted by the injection spring, and an actuated position allowing turning of the winder wheel. The autoinjector includes a re-cocking mechanism (400) for rewinding the thread on the winder wheel by turning the winder wheel in the opposite direction to its direction during the injection stage.

First claim

1 - 8 . (canceled)

9 . An autoinjector, comprising:
a reservoir module ( 100 ) comprising a reservoir ( 110 ) containing fluid and a piston ( 111 ), and including a needle ( 112 ); and a driver module ( 200 ) comprising:
a body ( 201 );
a piston rod ( 210 ) that is adapted to co-operate with the piston ( 111 ) of said reservoir ( 110 ), said piston rod ( 210 ) being movable between a rest position and an injection position in which said piston rod ( 210 ) has moved the piston ( 111 ) of the reservoir ( 110 ) so as to inject the fluid through said needle ( 112 );
an injection spring ( 220 ) for urging said piston rod ( 210 ) towards its injection position; and
a lock that blocks said piston rod ( 210 ) in its rest position, said lock comprising a thread ( 230 ) that is connected at one end to said piston rod ( 210 ) and at its other end to a toothed winder wheel ( 240 ), a locking member ( 260 ) co-operating with a tooth ( 241 ) of said toothed winder wheel ( 240 ), said locking member ( 260 ) being movable, in particular pivotable, between a blocking position in which it prevents the winder wheel ( 240 ) from turning in the direction of the actuation force (Fa) exerted by said injection spring ( 220 ) on said piston rod ( 210 ), and an actuated position in which said turning of the winder wheel ( 240 ) is possible;
said autoinjector being characterized in that it includes a re-cocking knob ( 400 ) for rewinding said thread ( 230 ) on said winder wheel ( 240 ) by turning said winder wheel ( 240 ) in the opposite direction to its direction during the injection stage.

10 . An autoinjector according to claim 9 , wherein said reservoir module ( 100 ) further comprises an actuator sleeve ( 110 ) that is movable relative to said reservoir ( 110 ) between a deployed position in which it is arranged around said needle ( 112 ), and an actuated position in which it is moved axially relative to the reservoir ( 110 ) so as to expose the needle ( 112 ).

11 . An autoinjector according to claim 9 , further comprising an interface module ( 300 ) that is fastened to the driver module ( 200 ) and that receives a reservoir module ( 100 ) before each actuation.

12 . An autoinjector according to claim 11 , wherein said interface module ( 300 ) comprises a selector ring ( 310 ) that is mounted to turn on the driver module ( 200 ), and pivot elements ( 320 ) for fastening the reservoir module ( 100 ) in the interface module ( 300 ).

13 . An autoinjector according to claim 12 , wherein said selector ring ( 310 ) is movable in turning between a locked position in which insertion of a reservoir module ( 100 ) is possible and actuation of the driver module ( 200 ) is not possible, an injection position in which actuation of the driver module ( 200 ) is possible, a safety position in which an actuator sleeve ( 110 ) of the reservoir module ( 100 ) returns into its deployed position around said needle ( 112 ), and an ejection position in which ejection of the used reservoir module is possible.

14 . An autoinjector according to claim 9 , wherein said driver module ( 200 ) includes force control means ( 280 , 290 ), for causing the force exerted by said injection spring ( 220 ) on said piston rod ( 210 ) to vary in predetermined manner throughout the injection stage, said force control means comprising a lever ( 280 ) and a cam ( 290 ), said lever ( 280 ) being pivotally mounted at one end on said piston rod ( 210 ), being connected to said injection spring ( 220 ), and co-operating at its other end with said cam ( 290 ).

15 . An autoinjector according to claim 9 , wherein a deflector wheel ( 250 ) forming a pulley for the thread ( 230 ) is provided between said piston rod ( 210 ) and said winder wheel ( 240 ).

16 . An autoinjector according to claim 9 , wherein said locking member ( 260 ) includes an extension ( 265 ) that is adapted to co-operate with an actuator sleeve ( 120 ) of the reservoir module ( 100 ) when said needle ( 112 ) has jabbed the site that is to be injected, so as to move said locking member ( 260 ) towards its actuated position.

Assignees

• Aptar France Sas

Inventors

• Fabien David

Classifications

• A61M5/31581

  performed by rotationally moving or pivoting actuator operated by user, e.g. an injection lever or handle · CPC title

• A61M5/2422

  using emptying means to expel or eject media, e.g. pistons, deformation of the ampoule, or telescoping of the ampoule · CPC title

• A61M5/2033

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

• A61M2005/2013

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

• A61M5/31593 Primary

  Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir · CPC title