An assembly comprising a drug delivery device and an add-on device adapted to be releasably mounted thereon, the drug delivery device comprising a rotatable dose setting member with an outer surface and at least one axially oriented drive groove. The add-on device comprises a drive portion adapted to be mounted in engagement with the dose setting member and comprises a drive structure adapted to engage a drive groove and being biased in a radially inwards direction. This arrangement allows the drive structure to rotationally slide on the dose setting member outer surface and into engagement with the drive groove(s).

A drug delivery assembly comprising a sensor system in combination with an indicator arranged to rotate, the amount of rotation being indicative of the size of an expelled dose amount. The sensor system comprises a sensor assembly adapted to measure a rotational position and/or a rotational movement of the indicator, the sensor assembly comprising a sensor element adapted to be operated at a non-constant sampling frequency. A processor is configured to determine on the basis of measured values from the sensor element rotational position(s) and/or amount of rotational movement of the indicator, as well as rotational speed of the indicator. To optimize energy consumption the processor is configured to dynamically control the sampling frequency in response to the determined rotational speed.

The present disclosure relates to a safety mechanism for a medicament delivery device for mechanical shock absorption, which safety mechanism has a medicament delivery member sleeve, a housing having a proximal opening arranged to receive the medicament delivery member sleeve, wherein the medicament delivery member sleeve is axially displaceable inside the housing, between an extended position in which a proximal end portion of the medicament delivery member sleeve extends proximally from the housing and a retracted position in which the proximal end portion is received by the housing, wherein the proximal end portion has a resilient structure, enabling compression of the proximal end portion in the distal direction upon impact of an axial force greater than a threshold value.

The present disclosure refers to an injection device comprising a housing, a cartridge holder having a first attachment member, a threaded sleeve insert axially and rotationally constrained to the housing, the threaded sleeve insert having a second attachment member for releasable attachment with the first attachment member, and a metering mechanism. The metering mechanism comprises an actuating element, a piston rod, a piston rod sleeve in which the piston rod can be non-rotatably connected in the piston rod sleeve, and a coupling element coupling the actuating element and the piston rod sleeve. The piston rod can be non-rotatably connected to the piston rod sleeve by a coupling sleeve. The cartridge holder is attached to the threaded sleeve insert by axially moving cartridge holder with respect to the threaded sleeve insert and the housing to engage the coupling sleeve with the piston rod sleeve.

A drive mechanism for an applicator for delivering multiple doses of medicament, comprising an axially moveable piston rod (2) having a non-circular cross-section and an external thread, a mounting member (4) with one member of a pair of blocking means, said pair comprising a toothed rim (4a, 3b) and at least one ratchet arm (3a, 4b); a drive sleeve (3) having an internal thread coupled with the thread of the piston rod (2), the drive sleeve (3) provided on the distal end with the other member of said pair of blocking means. A method of assembling the drive mechanism of the invention, in which the drive sleeve (3) together with the piston rod (2) and the piston rod guide (5) into the mounting member (4) are inserted from the side of the distal end of the applicator.

A device for administering a fluid product includes a first housing part with a receiver for the product, a second housing part detachably connectable to the first housing part, a piston rod held such that it can be displaced for the exertion of an emptying movement, an actuatable or releasable drive element for the piston rod, a coupling element including a coupling input element that couples the drive element to the piston rod in a coupling engagement, transmits a driving force of the drive element to the piston rod, and triggers the emptying movement, and a decoupling element displaceably connected to the second housing part and coupled to the first housing part such that it is displaced, by a movement of the housing parts in relation to each other when the housing parts are separated into a decoupling position wherein the piston rod is decoupled from the coupling input element.

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.

The present invention refers to a drug delivery device comprising a housing (5, 10) with an opening (12), a piston rod (11) having a proximal end and a distal end, at least a portion with an interface (14) adapted to engage the opening (12) for guiding the piston rod (11) during a distal or proximal movement of the piston rod (11) relative to the housing (5, 10) and at least one first attachment element (15) located at the distal end, and a bearing (16) with at least one second attachment element (17, 18) for rotatable attachment of the bearing (16) at the distal end of the piston rod (11). The at least one first attachment element (15) and/or the at least one second attachment element (17, 18) is elastically deformable in a radial direction for snap engagement of the piston rod (11) and the bearing (5, 10). The opening (12) comprises at least one portion having a contour adapted to receive the at least one first attachment element (15) and the at least one second attachment element (17, 18) if attached to each other but preventing disengagement of the at least one first attachment element (15) and the at least one second attachment element (17, 18) if received in the opening (12). Further, the present invention refers to an assembly method for a drug delivery device.

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.

The bearing component comprises a contact surface inside a periphery, which surrounds a centre, and a coupling feature arranged inside the periphery for rotatably engaging a component of a piston rod perpendicular to the contact surface. The coupling feature includes at least one flexible feature extending from the periphery towards the centre, and the flexible feature is arranged to be deflected towards the periphery by a force exerted on the flexible feature in a direction towards the contact surface and deflected towards the centre by a force exerted on the flexible feature in the opposite direction. The flexible feature may have a sloping surface facilitating assembly and preventing disassembly in combination with a further component of the piston rod. The component of the piston rod may be a lead screw, and the piston rod may be used in a drug delivery device.