A syringe device for ejecting a dose of a medicament, the syringe device comprising: a dose limiting mechanism arranged to interact with a dose ejecting mechanism to prevent ejection of a dose exceeding a set dose, and a safety mechanism, which is arranged such with respect to the dose ejecting mechanism that, if the dose limiting mechanism fails, the safety mechanism prevents ejection of a dose exceeding the set dose.

A dose setting mechanism includes a housing, a dose setting knob, and a dose setting device. The dose setting knob sets the desired dose by compulsory guided combined axial and rotational movement of the dose setting knob relative to the housing. The dose setting mechanism includes a coupling element, and upon drug delivery, the dose setting knob moves axially relative to the dose setting device or the housing. The coupling element engages at least one of the dose setting device and the housing to permanently axially lock the dose setting knob to one of the dose setting device or the housing.

A device includes a motor and a hollow drive shaft. The motor is configured to rotate the hollow drive shaft. A lead screw nut is operably connected to the hollow drive shaft. The lead screw nut is configured to rotate upon rotation of the hollow drive shaft. A lead screw is operably connected to the lead screw nut. The lead screw is configured to move within the lead screw nut and the lead screw is configured to pass through at least part of the hollow drive shaft.

An injection device including a housing, a dose indicator, and a release mechanism. The dose indicator is positioned within the internal space of the housing and includes a number of engaging members at least one thereof being configured to contact multiple of distinct ratchet features in course of a helical or screwing movement in distinct positions to provide a user with a tactile indexing appearance in the way of an increased or decreased dwelling torque at each of the multiple distinct positions. The release mechanism is connected to the dose indicator and includes a drive member. The release mechanism is configured to, when activated during dose dispense, urge the engaging members away from the distant position and against the force of the resilient bias thereby suspending the indexing ratchet appearance at least for a subset of the multiple distinct positions.

A method of delivering a dose from a single dose syringe includes applying a user input to a rotational component of a plunger rod assembly that is engaged with a plunger rod of the plunger rod assembly to advance a plunger seal in a direction parallel to an axis of rotation of the rotational component from an initial position towards a start of dose delivery position, and upon disengagement of the rotational component from the plunger rod, applying an axial user input to the plunger rod of the plunger rod assembly to advance the plunger seal from the start of dose delivery position to a completion of dose delivery position to deliver the dose, wherein the completion of dose delivery position is defined by abutment between the plunger rod and a housing of the plunger rod assembly.

A disclosed drug injection device includes: a case having a drug container located therein at one side; and a discharge amount adjustment module that is provided at the other side inside the case and, while rotating by a set angle only in one direction, adjusts a discharge amount of a drug stored in the drug container while speed is reduced by a speed reduction unit consisting of a combination of gears; a rotation amount detection module that detects a rotation value of the speed reduction unit and transmits detected data to a control device; and a locking module for locking to restrict rotation of the speed reduction unit when the rotation value detected by the rotation amount detection module reaches a set value.