Abstract: A pharmaceutical cartridge piston including a rigid core to resist compression of the piston. The resistance to compression contributes to the piston providing dose accuracy and dynamic recovery advantages.

Abstract: A medication dispensing apparatus that can be actuated with a small force to deliver a precise dose. The apparatus includes a fluid container having an injection chamber and a storage chamber in fluid flow communication. A first plunger is movable to alter the volume of the injection chamber, and a second plunger is movable to alter the volume of the storage chamber. The injection chamber has a cross-sectional area that is smaller than a cross-section area of the storage chamber. During dose setting, a drive assembly drivingly connected to the plungers shifts the plungers different distances so as to reduce the volume of the storage chamber while simultaneously increasing the volume of the injection chamber a similar amount. After dose setting, an actuator is movable with a small force to shift the first plunger to reduce the volume of the injection chamber to force medicine through an outlet of the fluid container.