An apparatus configured to be arranged within a housing of an injection device and for detecting a manipulation of the injection device comprises a cam part that is configured to be rotatable relative to a follower part; a resilient member arranged to urge the cam part and the follower part towards abutment with each other wherein rotation of the cam part relative to the follower part causes reciprocating motion of the follower part, wherein the follower part is configured to move reciprocally in an axial direction of the injection device; and a contact sensor provided between the cam part and the follower part and configured to detect the reciprocating motion of the follower part. The cam part comprises a profiled section comprising an axially varying profile arranged to be in abutment with the follower part and configured to cause reciprocating motion of the follower part.

A device and method for measuring a volume of liquid expelled from a syringe is provided. The device generally includes a syringe barrel, a plunger actuated with a plunger rod, and a sensor. The sensor may include two ports with one port being in fluid communication with a source of fluid external to the syringe barrel, while the second port is in fluid communication either with a proximal end portion of the syringe barrel or a hollow plunger rod having a first end closed by the plunger. The method may include expelling liquid from the syringe; detecting and recording differential pressure with the sensor over time; and calculating the volume of liquid expelled from the syringe from the recorded differential pressure over time.

A medicine injection pen includes a rotatable drive member and a rotary encoder associated with the drive member. The rotary encoder is configured to determine an amount of liquid medicine dispensed based on a rotational orientation of the drive member.

A needleless injector for performing a subcutaneous injection without a needle. The needleless injector has a drive end having a drive spring for driving a piston system against a plunger to push liquid out a nozzle of an ampoule with sufficient velocity to deliver a subcutaneous injection without a needle.

A needleless injector for performing a subcutaneous injection without a needle. The needleless injector has a drive end having a drive spring for driving a piston system against a plunger to push liquid out a nozzle of an ampoule with sufficient velocity to deliver a subcutaneous injection without a needle.

An assembly for a medication delivery device having a body, a piston rod and a setting nut. The piston rod is rotatable relative to the body in a dose setting state and is axially movable in a distal direction with respect to the body in a dose delivering state. The setting nut is secured against rotational movement with respect to the body, but is axially movable relative to the body, being helically coupled with the piston rod to axially travel in the proximal direction for setting a dose of a medication due to a helical movement of the setting nut with respect to the piston rod when the piston rod is rotated in the dose setting state, and is able to axially travel in the distal direction for delivering the set dose of the medication when the piston rod is axially moved in the dose delivering state of the assembly.

Shown is a simple, reliable manner of monitoring a process of expelling a variable dose of medicament from an injection device by analyzing mechanical feedback of the injection device with reduced requirements on signal data memory space and processing power. Specific measurand and mechanical user feedback sensor configurations enable sensor signal data from which individual dosage units of expelled drug are identifiable at moderate sampling rates. Preferred configurations include a force sensor adapted to measure an axial force component as applied to the device by a user pressing a proximal injection button, and a direction sensor adapted to measure an azimuth angle of an orientation of the device. The specific measurands, or process quantities observed, relate to feedback means of the device including a resilient element that produces a number of successive mechanical feedback events proportionate to a dose or quantity of drug expelled from a medicament reservoir.

The present disclosure relates to an assisted injection device for injecting a composition contained in a medical container. The injection device includes a body configured to receive the medical container in a fixed position relative to the body. The injection device includes a spring-loaded piston rod translationally movable inside the body along a spring axis. The injection device includes a lever pivotably mounted on the body about a first pivot axis orthogonal to the spring axis at a first distance form the spring axis. The injection device includes a selective blocking system coupled to the lever by a second pivot axis orthogonal to the spring axis. The lever is pivotable between a rest position. The selective blocking system engages the piston rod to prevent any translation movement of the piston rod and a second position wherein the selective blocking system releases the piston rod.

A dosage sensing module for or in a pen drug delivery device and comprising a power source unit, a processor unit and a dosage sensor unit with a first sensor part adapted to be fixed to a part not rotating during dose expelling and comprising a flexible printed circuit board sheet on which a pattern of individual electrical conductive sensor areas are arranged. The sensor unit further comprises a second sensor part adapted to be fixed to the piston rod to follow the rotation thereof during dose expelling. The second sensor part comprises individual structures that together with the conductive sensor areas are adapted to, upon relative rotational movement between the first and second sensor part, provide electrical signals to a processor unit indicative of the relative rotational position between the first and second sensor part.

A device for administering a fluid is provided, with a cylinder (16, 116) which has an open dispensing end (17), a piston (36) which is displaceable between a front and rear end position in the cylinder (16, 116) and is connected to a piston rod (35) that protrudes along a first direction beyond a rear end of the cylinder (16, 116) opposite the open dispensing end (17) and is guided in a receiving block (10), a nonreturn valve (18) closing the open dispensing end (17), and a tensioning device (S) which is connected to the piston rod (35, 135) and is arranged in the receiving block (10). The tensioning device (S) has a ramp (52) which is rotatable by means of a motor (12) and has a ramp track (53) extending along a helical line, wherein the ramp track (53) ascends from a first plateau along a region of inclination (S1, S2) to a second plateau and descends from the second plateau to the first plateau via a transition flank (46). The tensioning device (S) furthermore has a roller (51) which is in contact with the ramp track (53) and is mounted rotatably in a driver (50), which is connected to that end of the piston rod (35, 135) which protrudes out of the cylinder (16, 116), and therefore, upon rotation of the ramp (52), the ramp track (53) runs below the roller (51), which thereby rotates, wherein the roller (51) has a support region (55) which rests on the region of inclination (51, S2) of the ramp track (53), and at least one laterally adjoining side region (56, 57) which has a smaller outside diameter than the support region (55) and which does not rest on the region of inclination (S1, S2) of the ramp track (53), wherein, during rotation of the ramp, both the support region (55) and the side region (56, 57) come into contact with an edge (54) of the ramp track (53), said edge connecting the second plateau to the transition flank (46).