Patent ID: 8075533

Claim:
A two chambered syringe comprising: a first chamber comprising an outlet and a movable seal, the first chamber containing a liquid; a second chamber connected to the first chamber seal and movably disposed with the first chamber movable seal within the first chamber, the second chamber comprising a movable seal, and a conduit coupled between the first chamber and the second chamber and adapted to allow fluid communication between the chambers when the second chamber moveable seal is moved relative to the first chamber moveable seal, the conduit having a reduced cross sectional area relative to a respective cross sectional areas of the first and second chambers, the second chamber containing a solution, wherein the liquid and the solution do not contact each other due to fluid mechanics when disposed within the syringe; a latching mechanism having a first position in which movement between the first chamber seal and the second chamber seal is prevented to maintain a volume of the second chamber at a fixed volume, and a second position in which movement between the first chamber seal and the second chamber seal is permitted; and a single handle operably connected to the second chamber movable seal to move the first chamber seal within the first chamber when the latching mechanism is in the first position while maintaining the volume of the second chamber at the fixed volume and while expelling the liquid from the first chamber and to move the second chamber seal within the second chamber when the latching mechanism is in the second position allowing for reduction of the volume of the second chamber to expel the solution from the second chamber, and where the conduit remains fluidly coupled between the first and second chamber and the conduit remains at least partially unfilled while expelling the liquid from the first chamber and retaining the solution in the second chamber.