A syringe with an exchangeable cartridge

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/24 (2006.01) A61M 5/315 (2006.01)

Patent

CA 2222411

A syringe for dosed injection of a medicine from an exchangeable cartridge has a housing comprising a cartridge holder and a dosing mechanism by which a dose is set and subsequently injected by successively advancing a piston rod to press a piston into the cartridge. The dosing mechanism comprises a threaded spindle and a nut member co- operating with the spindle. A dose is set by relative rotation of the spindle and nut member whereby the nut member is moved along the spindle. The position of the nut member on the spindle defines how far the piston rod is advanced. The spindle and the nut is locked against relative rotation when the dosing mechanism is not operated to set a dose. Access to the cartridge holder is obtained by opening a lid connected to the housing and coupled to the dosing mechanism in such a way that the locking of the nut element in its position on the spindle is released when the lid is opened, and the opening movement of the lid is transmitted to a piston rod retraction mechanism.

Seringue conçue pour injecter des doses de médicaments à partir d'une cartouche interchangeable, qui comprend un logement contenant un porte-cartouche et un mécanisme de dosage permettant de fixer une dose puis de l'injecter en faisant avancer une tige de piston pour que celle-ci force le piston à s'introduire dans la cartouche. Le mécanisme de dosage comprend un axe fileté et un écrou agissant en coopération avec l'axe. La rotation de l'axe par rapport à l'écrou permet de fixer une dose en faisant en sorte que l'écrou se déplace le long de l'axe. La position de l'écrou sur l'axe détermine la distance de déplacement de la tige du piston. L'axe et la tige du piston sont bloqués lorsque le mécanisme de dosage n'est pas utilisé pour fixer une dose. On accède au porte-cartouche en ouvrant un couvercle relié au logement et couplé au mécanisme de dosage, de manière à libérer l'écrou se trouvant en position verrouillée sur l'axe lorsqu'on ouvre le couvercle. Le mouvement d'ouverture du couvercle est alors transmis à un mécanisme de rétraction de la tige de piston.

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