Housing Components for an Injection Device

A housing of a drug delivery device, the housing comprising:

• a first housing component configured to accommodate a cartridge filled with a medicament, the first housing component comprising a first connecting end;
• a second housing component configured to accommodate a drive mechanism of the drug delivery device, the second housing component comprising a second connecting end;
• an insert provided on one of the first connecting end and the second connecting end;
• a receptacle provided on the other one of the first connecting end and the second connecting end, wherein the insert is insertable into the receptacle along a longitudinal direction for mutually fastening the first housing component and the second housing component;
• a threaded connection to mutually connect the first connecting end and the second connecting end, the threaded connection comprising a helical thread provided on the insert and a helical counter thread complementary shaped to the helical thread and provided in the receptacle;
• a rotation lock configured to impede screwing and/or unscrewing of the first housing component and the second housing component when the housing is in a final assembly configuration, the rotation lock comprising a locking structure on the first housing component and a counter locking structure complementary shaped to the locking structure and provided on the second housing component.

An injection device for injecting a dose of a medicament, the injection device comprising:

• a housing comprising:
• a first connecting end;
• a second connecting end;
• an insert provided on one of the first connecting end and the second connecting end;
• a receptacle provided on the other one of the first connecting end and the second connecting end, wherein the insert is insertable into the receptacle along a longitudinal direction;
• a threaded connection to mutually connect the first connecting end and the second connecting end, the threaded connection comprising a helical thread provided on the insert and a helical counter thread complementary shaped to the helical thread and provided in the receptacle;
• a rotation lock configured to impede screwing and/or unscrewing of the first connecting end and the second connecting end when the housing is in a final assembly configuration, the rotation lock comprising a locking structure and a counter locking structure complementary shaped to the locking structure;
• a cartridge arranged inside the housing, the cartridge comprising a barrel filled with a medicament and sealed in a proximal longitudinal direction by a movable bung;
• and
• a drive mechanism arranged inside the housing, the drive mechanism comprising a piston rod operable to exert a distally directed dispensing force onto the bung of the cartridge.

An injection device kit comprising:

• a first housing and a second housing, wherein each of the first and second housing comprises:
• a first connecting end;
• a second connecting end;
• an insert provided on one of the first connecting end and the second connecting end;
• a receptacle provided on the other one of the first connecting end and the second connecting end, wherein the insert is insertable into the receptacle along a longitudinal direction;
• a threaded connection to mutually connect the first connecting end and the second connecting end, the threaded connection comprising a helical thread provided on the insert and a helical counter thread complementary shaped to the helical thread and provided in the receptacle;
• a rotation lock configured to impede screwing and/or unscrewing of the first connecting end and the second connecting end when the housing is in a final assembly configuration, the rotation lock comprising a locking structure and a counter locking structure complementary shaped to the locking structure;
• a mechanical coding provided on the insert,
• a mechanical counter coding provided in the receptacle,
• wherein when the mechanical coding does not match the mechanical counter coding the mechanical coding and the mechanical counter coding being operable to prevent a mutual assembly of the first connecting end and the second connecting end in the final assembly configuration;
• and
• wherein a coding feature of the mechanical coding of the first housing distinguishes from a coding feature of the mechanical coding of the second housing with regard to at least one of a thread type, a thread profile and a thread pitch of the helical thread.