Patent ID: 8529503

Claim:
A medicament delivery device, comprising: a generally elongated housing, comprising a proximal part and a distal part, each part having distal and proximal ends; a medicament cartridge, comprising a proximal opening closed by a septum, an axially movable distal stopper, and a first enclosure, wherein a liquid and a gaseous fluid are enclosed by the medicament cartridge; a medicament delivery member configured for attachment to the proximal part and having a non-delivery end; a medicament cartridge holder, wherein the medicament cartridge is coaxially arranged with the medicament cartridge holder, the medicament cartridge holder is arranged coaxially movable inside the proximal part, and the medicament cartridge holder comprises a second holder configured for holding the medicament cartridge holder in a non-activated position in which the medicament cartridge holder is releasably engaged to the proximal part and in which a predetermined distance is present between the septum and the non-delivery end; a manual pressure mechanism, comprising the proximal and distal parts and a static plunger rod arranged between the distal stopper and the distal end of the distal part, wherein the manual pressure mechanism is arranged to be moved from a non-pressure position, in which the proximal and distal parts are coaxially and movably connected to each other and the plunger rod abuts the distal stopper, to a pressure position, in which the proximal and distal parts are inwardly moved in relation to each other such that the plunger rod is moved into the medicament cartridge, thereby causing a pressure build-up inside the first enclosure; and an activation mechanism arranged to interact with the second holder only when the manual pressure mechanism is in the pressure position for disengaging the medicament cartridge holder from the non-activated position to an activated position, in which the medicament cartridge holder is axially displaced the predetermined distance, whereby the septum is penetrated by the non-delivery end and the liquid is expelled due to the pressure built up inside the first enclosure.