Novo Nordisk A/s

Nicolai Michael Jensen

Lars Peter Klitmose

Noekkvi Steinn Sigurdarson

Klaus Bendix

Nökkvi Steinn Sigurdarson

A drug delivery device includes a dose counting mechanism and an end-of-content or remaining-dose indication. For example, a dose expelling mechanism is coupled to a reciprocating element configured to undergo a predefined motion during each dose expelling action to allow a dose to be expelled. The predefined motion includes displacement in a first axial direction from a first position to a second position followed by displacement in a second axial direction from the second position to the first position, with a counter element being movable in the first axial direction. First and second unidirectional ratchet mechanisms prevent motion in the first axial direction and allow motion in the second axial direction of the reciprocating element relative to the counter element, and vice versa, respectively.

Drug delivery device with dose counting mechanism

The present invention provides a power unit () for a drug delivery device as well as methods for providing and mounting the power unit () in the drug delivery device. The power unit () comprises a first interface member () extending along a reference axis and comprising a hollow body () and a first engagement structure (), a second interface member () comprising a tubular structure () extending at least partially through the hollow body () and having a skirt (), and a second engagement structure () configured for releasable engagement with the first engagement structure (), and a torsion spring () comprising a first end portion () being attached to the first interface member () and a second end portion () being attached to the second interface member (), the torsion spring () being pre-strained to induce a relative rotational motion between the first interface member () and the second interface member (). The first interface member () and the second interface member () are configured for relative motion along the reference axis from a first relative axial position in which the first engagement structure () and the second engagement structure () are engaged to prevent the relative rotational motion between the first interface member () and the second interface member () to a second relative axial position in which the first engagement structure () and the second engagement structure () are disengaged. In the first relative axial position of the first interface member () and the second interface member () the torsion spring () is accommodated in a user inaccessible space () defined by the hollow body () and the skirt ().

Power unit for drug delivery device

The present invention concerns a drug delivery device () comprising: a housing () extending along a main axis, a torsion spring () comprising a first spring end () arranged stationarily with respect to the housing () and a second spring end () capable of rotation about the main axis, a rotatable shaft () extending along the main axis, the rotatable shaft () having a non-self-locking thread () and being axially fixed with respect to the housing (), a spring end retainer () to which the second spring end () is attached, the spring end retainer () being rotationally fixed relative to the rotatable shaft (), and a nut member () engaged with the non-self-locking thread (), the nut member () being axially movable by translation relative to the housing () to thereby travel the non-self-locking thread () between a first position in which the torsion spring () is in a relaxed state and a second position in which the torsion spring () is in a strained state.

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Koebenhaven SV, Denmark

Nicolai Michael Jensen