Medical injection device

An injection device (100,200;

• 100′;
• 100″) comprising:
• a housing (101;101′,101″),
• a cartridge (120;
• 120′;120″) arranged relative to the housing and defining a main axis, the cartridge (120;120′;120″) comprising an outlet covered by a cartridge septum adapted to be pierced by an injection needle (152,153;152′,153′;152″,153″) for establishing fluid communication with a cartridge interior and comprising a piston which is driveable along the main axis towards the outlet,
• a piston driver (110;110′;110″) for engaging the piston and capable of being actuated for driving the piston in a distal direction towards the outlet,
• a needle assembly (150;150′;150″) arranged at a distal end of the housing, the needle assembly comprising an injection needle (152,153;152′,153′;152″,153″) having front and rear sections for respectively penetrating skin of a subject user and for piercing the cartridge septum, the needle assembly (150;150′;150″) further comprising a needle container (151;151′;151″) accommodating the injection needle (152,153;152′,153′;152″,153″), the needle container (151;151′;151″) having an opening which in a storage state of the injection device (100,200;100′;100″) is sealed by a planar film seal (155;155′;155″) for maintaining the injection needle (152,153;152′,153′;152″,153″) in a sterile condition, and
• a cover (200,170;170′;170″) arranged relative to the housing (101;101′,101″) and configured for relative movement, wherein, in the storage state of the injection device (100,200;100′;100″), the cover (200,170;170′;170″) is held relative to the housing (101,101′;101″) in a first relative orientation wherein the cover (200,170;170′;170″) at least partly covers the needle assembly (150;150′;150″),
• wherein the injection device defines an unsealing member (115,206;115′;115″) which is adapted to cause the planar film seal (155;155′;155″) to change from a sealing state into an unsealing state by relative movement between the needle assembly (150;150′;150″)and the unsealing member (115,206;115′;115″), and
• wherein relative movement between the cover (200,170;170′;170″) and the housing (101;
• 101′;101″) from the first relative orientation to a second relative orientation causes the planar film seal (155;155′;155″)to change from the sealing state to the unsealing state for shifting the injection device into a ready-to-administer state, the cover (200,170;170′;170″) being continuously coupled with the housing during said relative movement between the cover (200,170;170′;170″) and the housing (101) from the first relative orientation to the second relative orientation,
• wherein the needle container (151;151′;151″)forms a body having a cup shaped form and defining a single sealed opening, wherein the single sealed opening is sealed by said planar film seal (155;155′;155″) to define a sealed chamber when the injection device (100,200;100′;100″) is in said storage state, the injection needle (152,153;152′,153′;152″,153″) being completely accommodated within the sealed chamber, and
• wherein the cover (200,170;170′;170″) is configured for being separated from the housing (101;101″;101″) subsequent to the cover (200,170;170′;170″) being operated for changing the planar film seal (155;155′;155″) from the sealing state to the unsealing state but prior to actuation of the piston driver (110;110′;110″) for driving the piston towards the outlet, the cover (170;170′;170″) being configured for removing the needle container (151;151′;151″) from the injection needle (152,153;152′,153′;152″,153″) as the cover (170;170′;170″)is separated from the housing (101;101′;101″).