Abstract: The present invention relates to a torsion spring driven injection device for delivering multiple set doses of a liquid drug from a cartridge by moving a plunger forward inside the cartridge. The torsion spring (134) applies a rotational torque onto a drive member (120) engaging a piston rod (115) which is then driven forward by this rotation. The piston rod driver can be coupled and de-coupled from the torsion spring mechanism. In the de-coupled position, the piston rod driver is freely rotatable and can thus rotate if the piston rod is moved axially. A further torsion arrangement (124) is preferably provided such that a torque is build up between the piston rod driver and the housing whenever the piston rod is moved backwards. This torsion arrangement urges the piston rod driver to rotate in a direction bringing the piston rod forward into abutment with the plunger.

Abstract: The present invention relates to an injection device for automatic torsion spring driven injection of a liquid drug. The injection device is of the type wherein a telescopically movable needle shield activates the release of the torque of the torsion spring to drive the injection when the needle shield is moved from its extended position to a retracted position. The injection device further has a needle holder carrying the injection needle, which needle holder is axially movable both in relation to the housing and in relation to the needle shield. It is therefore possible to retract the needle shield in relation to the housing and at the same time move the needle holder to its extended position such that the injection needle is presented outside the needle shield thereby providing for easy exchange of the injection needle.

Abstract: The present invention relates to an injection device for automatic torsion spring driven injection of a liquid drug. The injection device is of the type wherein a telescopically movable needle shield (20) activates the release of the torque of the torsion spring to drive the injection when the needle shield is moved from its extended position to a retracted position. The injection device is provided with a needle interface (30) carrying the injection needle, which needle interface is provided with means (32) preventing axial movement of the shield when no injection needle is mounted. Further, other means are provided to restrain the needle shield in the retracted position when the injection device is its “zero” position such that a user has access to the injection needle in order to exchange the injection needle.

Abstract: The invention relates to a torsion spring driven injection device having a dial-down mechanism for dialling down a selected dose size. The torsion spring (2) is strained when setting a dose by rotating a proximally located dose setting button(30) relatively to the housing in a first direction and unstained when rotating the same dose setting button (30) in a second direction opposite the first direction. In order to secure the torsion spring (2) in its strained position a one-way ratchet mechanism is provided. This one-way ratchet mechanism comprises a fixation element (1) coupled to the housing and having a toothing (6) and a ratchet element (20) having at least one ratchet arm (22) engaging the fixation element (1) and which ratchet element (20) is operational coupled to the dose setting button (30).

Abstract: The present invention relates to an injection device (1) having a mechanical dose size display wherein a first scale drum (10) carrying a series of first ciphers (11) and a second scale drum (20) carrying a series of second ciphers (21) are both rotatel able and axially moveable relatively to a housing (2) of the injection device in such a way that one of the first ciphers (11) and one of the a second ciphers (21) appears simultaneously in a window provided in the housing (2) thereby informing the user of the set dose. Bothe the first scale drum (10) and the second drum (20) preferable carries five ciphers (11, 21) around one full circumferential perimeter. The ciphers (11, 21) are provided in different circumferential circles and/or helically provided.

Abstract: The invention provides an assembly comprising a cover and a device arranged fully or partly in the cover. The device comprises a first portion, and a second portion moveable relative to the first portion between an initial and an actuated position, and the cover comprises a cavity portion and a closure portion which together form an enclosure in which the device is arranged initially. Movement of the closure portion from an initial position in a first direction results in the second portion of the device being moved in a second direction between the initial and the actuated position, the first direction being different from the second direction. By this arrangement it is possible to provide a cover-device assembly which is easy and intuitive to use and open and at the same time ensures that the enclosed device is actuated correctly.