Medicament delivery device

Abstract

The present disclosure relates to a medicament delivery device includes a housing configured to receive a cartridge containing a medicament, an injection needle having a proximal end and a distal end, an injection needle holder to which the injection needle is fixed, the injection needle holder being moveable relative to the housing between a rest position and a use position, and an injection needle cap detachably connected to the injection needle holder and enclosing the proximal end of the injection needle. The medicament delivery device is configured such that pushing the injection needle cap towards the cartridge causes the injection needle holder to move from the rest position in which the distal end of the injection needle is spaced from the cartridge towards the use position in which the distal end of the injection needle can engage the cartridge.

1 . A method comprising:
 pushing an injection needle cap of a medicament delivery device toward a cartridge such that a holder for an injection needle is moved distally from a rest position and such that a distal end of an injection needle engages the cartridge; and   pulling the injection needle cap away from the cartridge to expose a proximal end of the injection needle of the medicament delivery device for injection.   
     
     
         2 . The method of  claim 1 , wherein pushing the injection needle cap towards the cartridge comprises causing the holder for the injection needle to move from the rest position in which the distal end of the injection needle is spaced from the cartridge towards a use position in which the distal end of the injection needle engages the cartridge. 
     
     
         3 . The method of  claim 1 , wherein pushing the injection needle cap toward the cartridge comprises causing a plurality of arms of the holder to move away from each other such that a breakable material connecting the plurality of arms breaks. 
     
     
         4 . The method of  claim 3 , wherein the breakable material breaks along a frangible line provided in the breakable material. 
     
     
         5 . The method of  claim 3 , wherein the breakable material comprises a foil. 
     
     
         6 . The method of  claim 3 , wherein in the rest position, before pushing the injection needle cap toward the cartridge, the distal end of the injection needle is sealed by the plurality of arms, the breakable material, and the cartridge. 
     
     
         7 . The method of  claim 1 , wherein pushing the injection needle cap toward the cartridge comprises causing a plurality of arms of the holder to slide along the cartridge. 
     
     
         8 . The method of  claim 7 , wherein in the rest position, before pushing the injection needle cap toward the cartridge, the plurality of arms project from the holder and extend around the distal end of the injection needle. 
     
     
         9 . The method of  claim 7 , wherein the plurality of arms comprise a first arm and a second arm, wherein the first and second arms face each other and extend around the distal end of the injection needle. 
     
     
         10 . The method of  claim 7 , wherein the plurality of arms comprise a flexible material. 
     
     
         11 . The method of  claim 1 , wherein pushing the injection needle cap toward the cartridge comprises causing a locking mechanism of the medicament delivery device to prevent the holder from moving back toward the rest position. 
     
     
         12 . The method of  claim 11 , wherein the locking mechanism allows the holder to move in a first axial direction towards the cartridge and to a use position, whilst preventing the holder from moving in a second axial direction opposed to the first axial direction once the holder has reached the use position. 
     
     
         13 . The method of  claim 12 , wherein the locking mechanism comprises a first locking element provided on a housing of the medicament delivery device and a second locking element provided on the holder, wherein, when the holder is in the use position, the first locking element and the second locking element cooperate to prevent the holder from moving back towards the rest position. 
     
     
         14 . The method of  claim 12 , wherein the locking mechanism comprises a first locking element provided on a housing of a medicament delivery device and a second locking element provided on the holder, wherein pushing the injection needle cap toward the cartridge comprises causing the second locking element to move beyond the first locking element and abut against the second locking element, to prevent the holder from moving back towards the rest position. 
     
     
         15 . The method of  claim 12 , wherein the locking mechanism comprises at least one projection provided on the holder and at least one clip provided on a housing of a medicament delivery device, wherein pushing the injection needle cap toward the cartridge comprises causing the projection to move beyond the clip and abut against the clip, to prevent the holder from moving back towards the rest position. 
     
     
         16 . The method of  claim 1 , wherein in the rest position, the holder is prevented from being removed from a housing of the medicament delivery device by a retaining mechanism. 
     
     
         17 . The method of  claim 1 , wherein before pushing the injection needle cap toward the cartridge, a retaining element provided on at least one of a plurality of arms of the holder cooperates with the cartridge to prevent the holder from being removed from a housing of the medicament delivery device. 
     
     
         18 . The method of  claim 1 , wherein pushing the injection needle cap towards the cartridge comprises causing a fastening element provided on at least one of a plurality of arms of the holder to cooperate with the cartridge, to prevent the holder from moving towards the rest position. 
     
     
         19 . The method of  claim 1 , wherein pushing the injection needle cap towards the cartridge comprises causing a fastening element provided on at least one of a plurality of arms of the holder to cooperate with the cartridge, such that the holder is fixed relative to the cartridge. 
     
     
         20 . The method of  claim 1 , wherein pulling the injection needle cap away from the cartridge comprises detaching the injection needle cap from the holder to cause disengagement of an outer sleeve of the medicament delivery device from a housing of the medicament delivery device.