Auto-injector

An autoinjector, comprising:

• a reservoir module (100) comprising a reservoir (110) containing a 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 the injection position;
• and
• a lock that blocks said piston rod (210) in the rest position, said lock comprising a thread (230) that is connected at one end to said piston rod (210) and at an 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 a direction of an 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 further comprising a re-cocking knob (400) for rewinding said thread (230) on said winder wheel (240) by turning said winder wheel (240) in an opposite direction to the direction during an injection stage;
• 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 a site that is to be injected, so as to move said locking member towards the actuated position.