Abstract: Briefly described, the present invention includes a product display and delivery system using uniquely tailored, modular, disposable cartridges. In accordance with the preferred embodiments of the present invention, disposable cartridges having unique features are created from opposed, interlocking sleeves. Also, in accordance with another preferred embodiment of the present invention, disposable cartridges are releasably joined in modular fashion to allow easy stacking, arrangement, and replacement of the cartridges.

Abstract: An first rotor and an second rotor rotate about a longitudinal axis in a housing. The second rotor moves longitudinally relative to the first rotor. Rotor vanes extend outward from the rotors and are longitudinally split into longitudinally extending second vanes and longitudinally extending first vanes that slide longitudinally relative to one another. The second vanes travel longitudinally with the second rotor relative to the first rotor, and the second vanes slide relative to the first vanes that remain with the first rotor. The second rotor and the second vanes move longitudinally toward and away from a recess defined by the first rotor such that the active surface area of the rotor vanes is varied. When the second vanes slide away from the first vanes, surfaces of the first vanes are exposed that reciprocate into and out of specially defined chambers in a pump-like fashion. A movable element is connected to and extends from the second rotor.