Implementations of the present disclosure are directed to an injection device (102) including a medicament reservoir (103) configured to store a medicament to be expelled by the injection device (102), an acoustic source (122a, 122b, 122c, 122d, 200, 300, 400) configured to generate an acoustic signal including information indicative of an amount of the medicament stored in the medicament reservoir (103), the acoustic signal being transmitted to an external device (104) configured to process the acoustic signal and to extract injection device data.

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.

An injection device, in particular an auto-injector, with a single-use part for dispensing an injection solution has a sensor for acquiring a signal, with which an indicator can be determined, which represents a state or a change in state in a process for dispensing the injection solution with the single-use part. Additionally, the injection device has a reusable part, which is held in a detachable manner by coupling to the single-use part and is coupled via a signal connection, wherein the single-use part has the sensor, and/or wherein the reusable part has a reporting system for detecting the single-use part.

An electronic system for a drug delivery device is provided. The electronic system comprises a dose setting and drive mechanism comprising a first member and a second member, wherein in the dose delivery operation and/or in the dose setting operation, the first member moves, e.g. rotates, relative to the second member; an electronic control unit; an electrical use detection unit operatively connected to the electronic control unit, and configured to generate a use signal in response to the relative movement, e.g. a relative rotational movement, between the first member and the second member, preferably during the dose delivery operation. The electronic system is configured such that it is switched from a first state into a second state by the electronic control unit in response to the use signal, wherein the electronic system has an increased electrical power consumption in the second state as compared to the first state.

The present disclosure refers to a switch assembly for an electronic system of a drug delivery device. The switch assembly includes a chassis supporting a PCBA including at least a first electrical contact, a second electrical contact, a third electrical contact and a fourth electrical contact and a ring with a ratchet profile. The chassis moves axially relative to the ring from a first axial position to a second axial position during a first switch operation mode. The chassis and the ring are configured such that the ring rotates relative to the chassis during a second switch operation mode. The first electrical contact and the second electrical contact are arranged such that upon axial movement of the chassis towards the ring during the first switch operation mode, an electrical connection between the first electrical contact and the second electrical contact is closed.

An add-on device adapted to be releasably mounted on a drug delivery device, the add-on device comprising an outer assembly with an add-on dose setting member adapted to be coupled to the outer housing of a pen housing, as well as an inner assembly engaging the pen dose setting member and being in rotational engagement with the add-on dose setting member during dose setting. The invention addresses the issue of preventing transfer of movement from the add-on dose setting member to the inner assembly during dose expelling, which in accordance with the invention is realized by rotationally de-coupling the inner and outer assembly during dose expelling.

The present disclosure relates to a dose detection system for use in combination with a medication delivery device. In one aspect, the system includes a module keyed to the device and including a sensor operable to detect the relative angular position of a sensed element attached to the medication delivery device. The system determines the type of medication contained by the device, and/or the type of device, based on the detected angular position of the sensed element. In another aspect, the dose detection system is used in combination with a medication delivery device including a dose setting member which rotates relative to an actuator during dose delivery. The dose detection system includes a sensor and is operable to detect the relative angular positions of a sensed element attached to the dose setting member during dose delivery and to determine the amount of dose delivered. Related methods are also disclosed.

A sliding cover for a liquid delivery device, such as a cap (100) for a pen injector (200), incorporates a set of sensors including an optical sensor (110) with an output which changes during uncapping or capping motions on passing of a plunger (220) of the pen injector. This output is used together with a position sensor (120) to determine the position of the plunger along a cylinder (210) of the liquid delivery device. By monitoring changes in the plunger position, the quantity of dosages delivered by the liquid delivery device can be determined, displayed, stored and/or transmitted to an external device for further data processing or storage. Preferred implementations of the invention employ optical sensors with a converging beam (115), and/or position sensors employing linear potentiometer strips (132).

An electronic system for a drug delivery device including a dose setting and drive mechanism, a communication unit, an electronic control unit, and an electrical use detection. The dose setting and drive mechanism includes a first member and a second member that move relative to each other at least in the dose delivery operation and/or in the dose setting operation of the drug delivery device. The electronic system has a first state in which the communication unit is not activated and a second state in which the communication unit is activated. The electrical use detection unit is configured to generate a first signal indicative that the user has commenced or finished the relative movement between the first member and the second member. The electronic control unit is configured to switch the electronic system from the first state into the second state in response to the first signal.

Systems and methods for monitoring an operational state and/or a fill status of a drug container of a drug delivery device are provided. The drug container can hold a liquid drug. A plunger can be positioned within the drug container. A drive system can advance the plunger to expel the liquid drug from the container. A monitoring system can detect a movement and/or a position of the plunger and/or any component coupled to the plunger. The detection can enable determination of an amount of liquid drug that has been expelled and/or an amount of liquid drug remaining in the drug container. Dosing rates, flow rates, and dosage completion can also be determined.