A medication injection device comprising a medication container to contain medication; a connector provided with a blocking feature; a push rod having a plurality of teeth disposed along the length, and a spring biasing against the push rod to move proximally. The spring can be compression spring, extension spring, torsion spring, or constant force spring. By enabling or disabling engagement between the blocking feature on the connector and the tooth on the push rod, the push rod is either prevented from moving distally or allowed to move distally. The medication is drawn into the medication container when the push rod moves proximally and the medication is dispensed out of the medication container when the push rod moves distally.

A combination assembly comprising a process assembly and a thereto attachable sensor assembly is provided. The process assembly comprises an indicator element and a type identifier. The indicator element is arranged to rotate relative to a reference component and corresponding to a reference axis. The sensor assembly comprises a first sensor adapted to detect a rotational position and/or rotational movement of the indicator element, a second sensor adapted to detect a type identifier, an energy source, and a switch actuatable between an off state and an on state in which an operational cycle is initiated. The first sensor is operated to detect an amount of rotational movement performed by the indicator element, and the second sensor is operated to detect a type identifier. During an operational cycle the first and the second sensor are operated sequentially to prevent that peak draws of resources from the sensors take place concurrently.

Dose detection systems for medication delivery devices are described. One is a module for removable attachment to a dose button of a medication delivery device. A device with a dose detection system is also disclosed. The module includes a processor and a plurality of magnetic sensors, such as, for example, five or six sensors, operably coupled to the processor and configured to detect the positon of a rotating bipolar magnetic ring within the delivery device. Medication identification system may also be provided.

An injection device comprises a housing (12) having a longitudinal axis. The injection device further comprises a dose selector (16) capable of setting a dose to be ejected from the injection device and a dose indicator comprising a units wheel (18) operatively connectable to the dose selector so that rotation of the dose selector about the longitudinal axis also rotates the units wheel, and a tens wheel (19) selectively engageable with the units wheel so that rotation of the units wheel also rotates the tens wheel. A biasing means biases the dose indicator axially-rearwardly in the housing. An internal surface of the housing is provided with a tens housing feature selectively engageable with the tens wheel to prevent rotation thereof. An internal surface of the housing is provided with a units housing feature capable of moving the units wheel axially-forward against said biasing means such that the units wheel engages and moves the tens wheel axially-forward and free of said tens housing feature so as to allow rotation thereof.

A needle-free injection system may include an active substance cartridge, which may have a nozzle and a plunger-actuated dosing chamber for the pressurized dispensing of an active substance. The injection device may have a housing with a receptacle for accommodating the active substance cartridge and a piston, which may be movable relative to the housing and may be designed to execute a movement for the ejection of the active substance from the active substance cartridge, where a mechanism for driving the plunger may be provided, and the plunger may have a starting position related to the mechanism, from which position the piston may be released to move by means of a trigger. The mechanism may be designed to allow the piston to return to the starting position. The dispensing quantity of the active substance may be adjustable.

A medical device and system for the administration of a medical substance or for dosing body fluids comprising a rotor, rotating around an axis X-X, operatively connected to an injection device of said medical substance, and a rotor locking/unlocking device mechanically separate from the rotor and integral in rotation therewith. The locking/unlocking device comprises, in one piece, a disc, centered with respect to said axis X-X, from which a plurality of flexible fins radially unravel. The flexible fins are configured to flex around transverse hinges at a connection portion with the disc, and are angularly spaced so as to define gaps between adjacent pairs of fins which prevent interferences between adjacent fins in the respective flexing movement. The flexible fins are associated with ferromagnetic means for the operation of the same fins and locking/unlocking means of the rotation of the disc. The disc and fins are formed from a single plastic body.

A drive mechanism suitable for use in drug delivery devices is disclosed. The drive mechanism may be used with injector-type drug delivery devices, such as those permitting a user to set the delivery dose. The drive mechanism may include a housing, a dose dial sleeve, and a drive sleeve. A clutch is configured to permit rotation of the drive sleeve and the dose dial sleeve with respect to the housing when the dose dial sleeve and drive sleeve are coupled through the clutch. Conversely, when the dose dial sleeve and drive sleeve are in a de-coupled state, rotation of the dose dial sleeve with respect to the housing is permitted and rotation of the drive sleeve with respect to the housing is prevented. In the de-coupled state, axial movement of the drive sleeve transfers force in a longitudinal direction for actuation of a drug delivery device.

An assembly for a drug delivery device is provided comprising a housing, and a lead screw having a longitudinal axis, a distal end and a proximal end, the lead screw being rotatably fixed during dose setting and dose delivery and axially movable in a distal direction relative to the housing, the lead screw further including a thread. The assembly further comprises a drive nut threadedly engaged with and screwable along the lead screw thread and a dial link connected with the drive nut and axially movable and rotatably fixed relative to the drive nut, where the dial link comprises a first portion of a feedback ratchet. The assembly is configured such that, during dose delivery, the assembly generates a feedback signal.

The present invention provides a drug injection device (100) comprising a first element (140) and a second element (103) configured to undergo unidirectional movement relative to each other corresponding to an action performed on or by the drug injection device (100), wherein the first element (140) comprises a plurality of serially disposed protrusions (143), wherein the second element (103) comprises first and second deflectable transducers (103a/153a, 103b/153b) configured for sequentially cooperating with the plurality of protrusions (143), and wherein a processor (151) is electrically connected with the first and second deflectable transducers (103a/153a, 103b/153b) to register activation signals, wherein the protrusion configuration is so disposed on the first element (140) and the first and second deflectable transducers (103a/153a, 103b/153b) are so disposed on the second element (103) that a second activation signal generated by the second deflectable transducer (103b/153b) is delayed relative to a first activation signal generated by the first deflectable transducer (103a/153a) as the first element (140) and the second element (103) move relative to each other, and wherein the processor (151) is configured to provide a) a first control action if a time delay between the first and second activation signals is above or equal to a pre-defined value, and b) a second control action if said time delay is below said pre-defined value.

A fixed dose injector pen is provided that includes a transmission element that is rotated to set and deliver a dose of a drug from a multi-dose cartridge. A circular ratchet defines a small number of engagement positions around its circumference and selectively transmits the rotation of the transmission element to a piston rod driver. The circular ratchet transmits the rotation of the transmission element to the piston rod driver only when the transmission element is rotated in a dose delivery direction, and only if the transmission element has previously been rotated in an opposite, dose setting direction through an angle sufficient to reach one of the engagement positions. An axially moving injector element can be used to drive rotation of the transmission element via a helical coupling. When the piston rod has advanced to a predetermined axial position, a last dose lock-out mechanism maintains the circular ratchet in engagement.