A dose setting mechanism for a medicament delivery device is presented having a locking assembly that reliably and consistently unlocks a dose injection button and concurrently a lead screw when the dose setting mechanism is transitioned from a non-activated state to an activated state. This locking assembly uses a rotating plate having a locking protrusion that engages a radial projecting tab on a rotationally fixed plunger rod nut. An alignment member is also presented that prevents rotational drift of a dosing member.

A medication injection pen (50) includes a housing (1) and a dose set knob (2) rotatably connected to the housing (1) for setting a dose. An indicator member (200) is movable between a visible position indicating a zero position of the dose set knob (2) and a non-visible position indicating a non-zero position of the dose set knob (2). The indicator member is visible to a user in the visible position and not visible to the user in the non-visible position. The dose set knob is in the zero position when a set dose has been completely administered. Accordingly, a visible indication is provided to the user when a set dose has been completely administered.

The present disclosure relates to a medication delivery device having a dose detection system and an associated control system configured to determine an amount of medication delivered from the medication delivery device based on the sensing of relative rotation within the medication delivery device. The relative rotation may occur between a dose setting member and an actuator and/or housing of the medication delivery device. The rotation sensing may involve piezoelectric sensing, more specifically repeatedly deforming a piezoelectric sensor with a mechanical force. The dose detection system may be a modular or integral component of the medication delivery device.

A mechanism unit for a drug delivery device, comprising a housing (10), a piston rod (30), and a dose setting and drive mechanism, which is configured to perform a dose setting operation and a dose delivery operation by transferring a delivery force to the piston rod (30) in order to drive the piston rod (30) in a distal direction in a dose delivery operation, wherein the dose setting and drive mechanism comprises a first drive member (40a), a second drive member (40b), and a clutch mechanism, which has at least two different states, a setting state and a delivery state, wherein, in the setting state, the second drive member (40b) is rotationally secured with respect to the housing (10) at least against rotation in a delivery direction, and wherein, in the delivery state, the second drive member (40b) is rotatable relative to the housing (10) in the delivery direction, wherein, in the setting state, the first drive member (40a) is rotatable relative to the second drive member (40b) at least in the delivery direction, and wherein, in the delivery state, the second drive member (40b) is rotationally locked to the first drive member (40a) at least against rotation of the second drive member (40b) relative to the first drive member (40a) in the delivery direction.

An injection device includes a housing; an actuation member movable between a first position relative to the housing and a second position relative to the housing, wherein the actuation member is arranged to inhibit a mechanical operation of the injection device when the actuation member is in the first position, and allow the mechanical operation of the injection device when the actuation member is in the second position; electronic circuitry; and an actuation sensing arrangement, wherein the actuation sensing arrangement is configured to detect movement of the actuation member from the first position relative to the housing to the second position relative to the housing, and wherein the electronic circuitry is configured to be activated in response to detection by the actuation sensing arrangement that the actuation member has moved from the first position relative to the housing to the second position relative to the housing.

An auto-injector device for delivering medicaments is disclosed. The auto-injector device includes a syringe assembly having a needle adapted to expel medicaments from the syringe assembly and a barrel adapted to hold the medicaments. The syringe assembly includes a plunger positioned coaxially with respect to the barrel and adapted to reciprocate within the barrel to expel the medicaments from the barrel. Further, the syringe assembly includes a locking member adapted to be engaged with the plunger to hold he plunger in a position with respect to the barrel. The position of the plunger with respect to the barrel is adapted to be adjusted to vary a volume of medicaments to be expelled from the barrel. The position of the plunger is adjusted by engaging the locking member with the plunger at one of a plurality of positions along a length of the plunger.

Medication delivery devices are provided having a dose delivery sensing capability. A sensed element is attached to a dose setting member of the device. The sensed element includes surface features radially-spaced from one another. A rotational sensor is attached to an actuator of the device. The rotational sensor includes a movable element that is contactable against the surface features. The rotational sensor is configured to generate a signal in response to the movement of the movable element over the surface features during their rotation. A controller is operatively coupled to the rotational sensor, and in response to receiving the generated signal, the controller is configured to determine a number of the surface features passing the movable element of the rotational sensor during dose delivery. The number can be associated with an amount of dose delivered. Sensing can be provided in a module or integrated in device.

The present invention relates to a drug delivery device (100) comprising a housing (101), a threaded piston rod (102), a rotatable drive tube (103), a drive nut (104) in threaded engagement with the piston rod (102) and being rotationally locked but axially moveable relative to the drive tube (103), and a support member (105) arranged rotationally free on the piston rod (102), the support member (105) being axially locked relative to the housing (101) and arranged to allow the drive tube (103) to move axially. The device further comprises a compression drive spring (106) arranged between the piston rod (102) and the drive tube (103), the compression drive spring (106) being arranged axially between the drive nut (104) and the support member (105).

The invention relates to an injection unit, preferably a pen-shaped injection unit, for administering or delivering a fluid product. The injection unit comprises a housing, an axially movable piston rod mounted in the housing in a non-rotatable manner, a delivery apparatus having a threaded nut that is able to move the piston rod in order to deliver product, a dosing device having a dosing sleeve, a rotary knob, a discharge button arranged coaxially on the dosing sleeve, and a receptacle for the product. The dosing device is connected to the delivery apparatus via a coupling mechanism, wherein the coupling mechanism includes of at least two coupling surfaces that each carry a toothing comprising teeth, wherein the coupling surfaces are used to generate an acoustic and/or tactile signal corresponding to the set or corrected dose of the product to be administered during the dosing operation or during correction of the dose.