Abstract: A disposable reservoir unit configured for releasable attachment to a reusable drive unit of an injection device includes a reservoir holder for holding a reservoir, two radially extending and oppositely arranged protrusions for releasably attaching the reservoir unit to the drive unit, and a needle cover sleeve guided by guiding means and movable along the longitudinal axis relative to the reservoir holder between a covering position and a retracted position. In a plane perpendicular to the longitudinal axis the needle cover sleeve has a first outer dimension along a first axis and a second outer dimension along a second axis perpendicular to the first axis, the first outer dimension is larger than the second outer dimension, and the protrusions are arranged on the first axis.

Abstract: An electronic module configured for releasable attachment to a medicament delivery device (20) includes a printed circuit board (16c) with an electronic circuit (29), a battery (16b), and a switch for activating the electronic module (16). The switch includes an electric activation contact (28) providing a connection with the electronic circuit (29) and a battery contact extension (27) extending from a terminal (16d, 16e) of the battery (16b). The battery contact extension (27) is biased towards the electric contact (28) for closing a switching or air gap (30) between the battery contact extension (27) and the electric activation contact (28), and the battery contact extension (27) is configured to engage an actuation element (11, 6) of the medicament delivery device (20) such that the actuation element (11, 6) pushes the battery contact extension (27) against the bias thereby creating the switching or air gap (30).

Abstract: An electronic module configured for releasable attachment to a medicament delivery device (20) includes a printed circuit board (16c) with an electronic circuit (29), a battery (16b), and a switch for activating the electronic module (16). The switch includes an electric activation contact (28) providing a connection with the electronic circuit (29) and a battery contact extension (27) extending from a terminal (16d, 16e) of the battery (16b). The battery contact extension (27) is biased towards the electric contact (28) for closing a switching or air gap (30) between the battery contact extension (27) and the electric activation contact (28), and the battery contact extension (27) is configured to engage an actuation element (11, 6) of the medicament delivery device (20) such that the actuation element (11, 6) pushes the battery contact extension (27) against the bias thereby creating the switching or air gap (30).

Abstract: The present invention concerns a drug delivery device with an electric brushless DC or stepper motor. A novel approach to motor control uses the micro-stepping technique in combination with over-revving the commutation of the stepper motor and reversing the rotor for a small number of microsteps with each delivery cycle. This approach has the effect of keeping the elasticity of the drive train behind the plunger in a relaxed state after completing a delivery cycle, providing better control of the movement of the rotor. Loss of steps can be avoided for a wide range of friction or speed situations, increasing the accuracy of drug delivery and making tracking of the rotor position and detecting loss of steps a much better parameter to detect blockage or occlusion. The increased controllability allows to substantially increase the motor speed for delivery, resulting in an optimum of energy efficiency while still ensuring reliable operation.