fig1 schematically illustrates a drug delivery device 10 according to the prior art designed as a pen - type injector . the device 10 comprises a proximal housing component 12 as well as a distal housing component 14 . the distal housing component 14 may be designed as a protective cap , alternatively as a cartridge holder 18 to keep a cartridge 26 filled with a medicament in position . at a proximal end 15 , the drug delivery device comprises a dose button 16 by way of which a dose to be dispensed by the device 10 can be individually selected and dispensed . the distal end 17 of the drug delivery device 10 and in particular the distal section of a cartridge holder 18 is adapted to be releasably coupled with a piercing assembly , such like an injection needle , in order to dispense a pre - defined amount of the liquid medicament by way of injection . therefore , distally located end section 17 of the cartridge holder 18 comprises a threaded socket . the cartridge holder 18 further comprises at least one inspection window 19 in order to visually inspect the filing level of the cartridge 26 . the cartridge 26 itself is at least partially filled with a medicament to be dispensed by the device 10 . the cartridge 26 comprises a distally located seal 28 adapted to be intersected or pierced by a piercing assembly , which is not particularly illustrated here . towards its proximal end section the cartridge 26 comprises a displacable seal in form of a piston to become operably engaged with the piston rod 30 of a drive mechanism arranged in the proximal housing component 12 . in fig3 , a simplified view of a drug delivery device 10 according to the present invention is illustrated . the device 10 comprises a proximally located housing component 12 and a protective cap 14 at least partially covering the distally located directed and downward pointing cartridge holder 18 . the protective cap 14 is pivot mounted by way of a hinge 20 on a distal portion of the housing 12 . as illustrated in the course of fig3 to 5 , the protective cap 14 starting from an initial configuration as shown in fig3 can be flapped away in a sideward direction 36 in order to provide access to the cartridge holder 18 and its distal end portion 32 . the protective cap 14 is connected with the hinge 20 near its proximal portion in order to enable a respective displacement of its distal portion relative to the cartridge holder 18 . in order to provide and to enable a pivoting motion of the protective cap 14 , the cap itself comprises at least one lateral slit 22 , which , in fig3 to 5 , is only indicated . said lateral slit or through opening 22 is arranged on a lateral side wall portion of the protective cap 14 facing away from the initial pivot direction 36 as indicated in fig3 . this way , the cartridge holder 18 with its distal end section 32 may penetrate said slit or through opening 22 when the protective cap 14 is flapped away . similarly , when starting from a position of use as indicated in fig5 , said lateral opening 22 in the protective cap 14 allows to receive the cartridge holder 18 of the drug delivery device 10 . in the embodiment according to the fig6 to 8 , the protective cap 34 is pivot mounted on the cartridge holder 18 . furthermore , the protective cap 34 comprises two oppositely located slits or through openings 22 , 24 . by way of the second through opening 24 facing towards the pivot direction 36 , the protective cap 34 can even be pivoted or rotated by about 180 °. the cap 34 may therefore receive the proximally located housing 12 of the drug delivery device 10 . in such a position of use as indicated in fig8 , an easy and intuitive handling of the drug delivery device 10 can be provided . additionally or according to another embodiment , the protective cap 34 may even be slidingly supported relative to the cartridge holder 18 and / or relative to the housing 12 in distal and / or proximal direction as indicated by the double - tipped arrow 38 in fig6 . by way of a longitudinal , distally or proximally directed relative displacement of protective cap 34 and cartridge holder 18 , mutual interlocking of protective cap 34 and cartridge holder 18 and / or interlocking of protective cap 34 with the housing 12 can be provided . hence , unintentional pivoting of the protective cap 34 relative to the cartridge holder 18 or relative to the housing 12 can be impeded . additionally , by providing a translational displacement between cartridge holder 18 and protective cap 34 or between housing 12 and protective cap 34 , the size and geometry of the lateral slit or slits 22 , 24 can be adapted accordingly .
the present invention relates to a drug delivery for dispensing of a dose of a medicament comprising : a housing , adapted to receive a drive mechanism , a cartridge holder to receive a cartridge comprising a medicament , and a protective cap adapted to at least partially enclose a distal end section of the cartridge holder and being pivot mounted on the housing or on the cartridge holder .