Patent ID: 7237693

Claim:
A fluid cartridge for storing and dispensing two fluids, wherein one of the fluids to be stored and dispensed is of a greater amount than the second fluid, comprising: an outer cartridge wall defining an outlet and an open end opposite the outlet; an inner cartridge wall disposed within the outer cartridge wall and defining an outlet that is co-located with the outlet defined by the outer cartridge wall; a first piston disposed within the inner cartridge wall, wherein the inner cartridge wall and the first piston define a fluid chamber for the fluid of lesser amount; a second piston disposed within the outer cartridge wall between the first piston and the open end of the outer cartridge wall; a third piston having a seal on its outer periphery disposed between the outer cartridge wall and the inner cartridge wall forming a first fluid chamber for the fluid of greater amount; a fixed wall disposed between the second piston and the third piston, wherein the fixed wall and the second piston define a second fluid chamber for the fluid of greater amount; means for transmitting force from the second piston to the first piston; means for transmitting force from the second piston to the third piston; and a delivery channel disposed between the first and second fluid chambers for the fluid of greater amount, which allows fluid communication between the first and second fluid chambers for the fluid of greater amount.