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.

Drug delivery device adapted to expel a set dose, comprising an expelling mechanism with a drive spring, a dose setting mechanism with first and second dose setting ratchet parts, a bias spring as well as control means. The control means is adapted to rotate the second ratchet part in a first direction to thereby set a dose when rotating the dose setting member in the first direction, and move the ratchet parts axially out of engagement with each other when the dose setting member is rotated in the opposite direction. When the first and second ratchet parts have been axially disengaged, the drive spring will rotate the second ratchet part in the second direction to thereby reduce the set dose, the bias spring moving the ratchet parts axially into engagement with each other again, this resulting in the set dose being reduced corresponding to one tooth of the ratchet mechanism.

An injection device incorporating a dose setting mechanism is presented where the dose setting mechanism contains a dose selector having one or more dose stops corresponding to a finite set of predetermined fixed doses, where the set of finite predetermined fixed doses includes a lowest fixed dose and one or more higher fixed doses, and where at least one of the one or more higher fixed doses is equal to the lowest fixed dose plus a fractional amount of the lowest fixed dose. The dose setting mechanism can further include a floating spline that is rotationally engaged with a snap element such that the snap element can rotate relative to the floating spline during both dose setting and dose delivery.

A portable pen-type drug injection device (300) comprises a main portion (301) and a clip (360). The clip comprises a base portion mounted to a portion of the drug delivery device, and a clip gripping portion with a free end. The device further comprises drug expelling means having dose setting means (340) allowing a user to set a dose of drug to be expelled, and a piston rod adapted to move a piston of a loaded cartridge in a distal direction to thereby expel drug from the cartridge. Electronic circuitry comprises sensor means adapted to detect a set and/or an expelled dose, and a display (374) is provided to display dose-related values, wherein at least a portion of the display is arranged in the flexible clip main portion.

The present invention relates to injectors, such as pen-type injectors, that provide for administration of medicinal products from a multidose-cartridge and permit a user to set the delivery dose. The injector may include a housing, a piston rod adapted to operate through the housing, a dose dial sleeve located between the housing and the piston rod, and a drive sleeve located between the dose dial sleeve and the piston rod. The dose dial sleeve may have a helical thread of first lead and the drive sleeve may have a helical groove of second lead. The first lead of the helical thread and the second lead of the helical groove may be the same.

The present invention relates to injectors, such as pen-type injectors, that provide for administration of medicinal products from a multidose cartridge and permit a user to set a delivery dose. An injector may include a housing, a cartridge containing a medicinal product, the cartridge being retained within the housing, means for selecting a dose of the medicinal product to be expelled, and means for expelling the selected dose of the medicinal product. The housing may be a unitary housing within which the means for selecting the dose and the means for expelling the selected dose are moveably retained. Alternatively, the injector may include a housing, a piston rod, an insert located in the housing and through which the piston rod may rotate, ratchet means, a dose dial sleeve, a drive sleeve, a button located on the drive sleeve and rotatable with respect to the drive sleeve, and clutch means which upon depression of the button prevents rotation between the dose dial sleeve and the drive sleeve.

A medication delivery device and/or dosing mechanisms suitable for use in medication delivery devices, in particular in pen-type injectors, preferably having a dose setting system and a drive device enabling the administration of a medicinal product from a single- or multi-dose medication cartridge.

The present invention provides a power unit (1) for a drug delivery device as well as methods for providing and mounting the power unit (1) in the drug delivery device. The power unit (1) comprises a first interface member (30) extending along a reference axis and comprising a hollow body (31) and a first engagement structure (35), a second interface member (10) comprising a tubular structure (11) extending at least partially through the hollow body (31) and having a skirt (12), and a second engagement structure (14) configured for releasable engagement with the first engagement structure (35), and a torsion spring (20) comprising a first end portion (23) being attached to the first interface member (30) and a second end portion (22) being attached to the second interface member (10), the torsion spring (20) being pre-strained to induce a relative rotational motion between the first interface member (30) and the second interface member (10). The first interface member (30) and the second interface member (10) are configured for relative motion along the reference axis from a first relative axial position in which the first engagement structure (35) and the second engagement structure (14) are engaged to prevent the relative rotational motion between the first interface member (30) and the second interface member (10) to a second relative axial position in which the first engagement structure (35) and the second engagement structure (14) are disengaged. In the first relative axial position of the first interface member (30) and the second interface member (10) the torsion spring (20) is accommodated in a user inaccessible space (39) defined by the hollow body (31) and the skirt (12).

Implementations of the present disclosure are directed to a module for attachment to an injection device that includes a flexible carrier foil configured to be attached to a surface of the injection device independent of a geometry of the surface, at least one light emitting diode attached to the flexible carrier foil in a first position and configured to emit a light signal in a direction based on the first position through a transparent wall of the injection device, at least one photodiode attached to the flexible carrier foil in a second position relative to the first position, the at least one photodiode being configured to detect at least a portion of the light signal from a direction based on the second position and being configured to emit an electrical signal based on the light signal to a microprocessor, and wherein the microprocessor is configured to receive the electrical signal emitted by the photodiode and to determine the position of a stopper and the amount of the fluid within the injection device based at least in part on the electrical signal.

The present disclosure relates to a dose detection system for use in combination with a medication delivery device in which a dose setting member rotates relative to an actuator during dose delivery. The dose detection system includes a module which is removably attached to the medication delivery device. The module includes a dosing component attached to the actuator during dose delivery. The dosing component includes a light source and a light sensor. A sensed element is attached to the dose setting member and includes surface features detectable by the light sensor.