Syringe device with a dose limiting mechanism and an additional safety mechanism

A syringe device for ejecting a dose of a medicament, the syringe device comprising:

• a housing;
• a dose ejecting mechanism comprising:
• a dose setting member rotatable in relation to the housing so as to set a dose to be ejected,
• a piston rod arranged with respect to the housing such that axial movement of the piston rod in a distal direction causes the set dose to be ejected,
• structure for transforming rotational movement of the dose setting member into axial movement of the piston rod during ejection of the set dose in the form of an ejection assisting system comprising a pre-strained torsional spring arranged to rotate a driver relative to the housing, the pre-strained torsional spring providing an ejection force forcing the piston rod in the distal direction so as to eject the set dose without the aid of a user, when the user has initiated the injection of the set dose;
• a dose limiting mechanism operably connected with the dose ejecting mechanism to prevent ejection of a dose exceeding the set dose;
• a safety mechanism structure operably connected to the dose ejecting mechanism such that if the dose limiting mechanism fails, the safety mechanism structure prevents ejection of a dose exceeding the set dose;
• and
• wherein the dose limiting mechanism and the safety mechanism are two independent mechanisms working independently from each other.