Improvements in and relating to medicament delivery devices

Details Improvements in and relating to medicament delivery devices Improvements in and relating to medicament delivery devices

A - Human Necessities

61

M

A61M 5/315 (2006.01) A61M 5/145 (2006.01)

Patent

CA 2757134

A medicament delivery device (1) comprises a housing (2) for holding a medicament cartridge (9), a piston rod (22, 24) and a drive (11, 20). The medicament cartridge (9) has a medicament outlet and a bung (13) moveable axially along the medicament cartridge for dispensing a medicament, the piston rod has a plunger (24) for moving the bung and a lead member (22) telescopically coupled to the plunger (24) that may be driven by the drive (11, 20) to extend or retract the piston rod (22, 24). Additionally, the device comprises a linkage (40) coupled between the plunger (24) and an anchorage (44) and a drive member (20) telescopically coupled to the lead member (22). The drive (11) is operative to rotate the drive member (20) to telescopically move the lead member relative to the drive member whereby the plunger is moved relative to the lead member by way of the linkage (40).

Un dispositif d'administration de médicament (1) comprend un boîtier (2) renfermant une cartouche de médicament (9), une tige de piston (22, 24) et un entraînement (11, 20). La cartouche de médicament(9) possède une sortie et un bouchon (13) se déplaçant axialement le long de cette cartouche. La tige de piston comporte un piston (24) déplaçant le bouchon et un élément directeur (22) relié télescopiquement au piston (24) qui peut être mu par l'entraînement (11, 20) et ce faisant repousse ou rappelle la tige de piston (22, 24). Par ailleurs, le dispositif comprend une tringlerie (40) reliant le piston (24) et un ancrage (44), et un élément menant (20) relié télescopiquement à l'élément directeur (22). L'entraînement (11) fait tourner l'élément menant (20), ce qui déplace télescopiquement l'élément directeur par rapport à l'élément menant, le piston étant déplacé par rapport à l'élément directeur via la tringlerie (40).

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