Patent ID: 6059755
Filing Date: 2000-05-09
Classification: A61M

Abstract:
An injection device for injecting a medicament comprising:a disposable part comprising an ampoule holder for accommodating a container of medicament, said container operably carrying an axially movable plug, a plunger rod operably coupled to the ampoule holder, said plunger rod non-rotatable, but axially movable with respect to the ampoule holder, a nut rotatably and axially fixed with respect to the disposable part during the selecting of dose and a spring disposed around the plunger rod for tending to cause the nut to remain in its axial position; anda reusable part removably connectable to said disposable part and comprising a casing detachably connectable to the ampoule holder, dosing means operably coupled to the casing for selecting a dose of the medicament and comprising a rotatable dosing button and a coupling element for releasably linking the dosing button and the nut and transmitting rotation of the dosing button to the nut, and ejection means operably coupled to the reusable part for moving the plunger rod axially when the disposable part is connected to the reusable part whereby said rod moves said plug to eject the selected dose of medicament from the container.