Mixing vial

1. A syringe system, the system comprising:

a syringe with an axially movable plunger having a distal end defining a shoulder, wherein a harpoon extends axially from the distal end of the plunger, wherein the shoulder has a larger diameter than a harpoon minimum diameter, wherein the harpoon is static with respect to the plunger; and

a mixing vial for use in the syringe, said mixing vial including:

a vessel, the vessel comprising a hollow interior chamber with proximal and distal ends, a neck at the proximal end, the neck having distal and proximal open ends; and

a stopper-pistol the stopper-piston comprising a hollow interior chamber with an open distal end and a closed proximal end, and the entire shipper-piston being slidably positioned in a sealing relationship with said neck, wherein the entire stopper-piston is slidable from a first position to a second position, wherein the entire stopper-piston is adjacent the proximal end of the vessel when in the first position, and wherein the entire stopper-piston is closer to the distal end of the vessel than to the proximal end of the vessel when in the second position; and

a dislodgeable plug positioned in and sealing said open distal end of said hollow interior chamber of the stopper-piston, wherein the entire dislodgeable plug is fully dislodgeable as a single piece from the open distal end of the stopper-piston;

wherein said stopper-piston comprises a radially inwardly extending flange, wherein the radially inwardly extending flange defines an inward facing annular groove that receives an edge of the dislodgeable plug,

wherein a stopper-piston breakout force is required to cause the stopper-piston to slide in a direction from the first position toward the second position, and a plug dislodging force is required to fully dislodge the dislodgeable plug from the inward facing annular groove defined by the radially inwardly extending flange of the stopper-piston in the direction from the first position toward the second position, wherein the plug dislodging force is less than the stopper-piston breakout force; and

wherein, when the mixing vial is disposed in the syringe and the plunger is axially moved, the harpoon penetrates the closed proximal end of the stopper-piston, contacts the dislodgeable plug, and fully dislodges the dislodgeable plug prior to the shoulder of the plunger contacting the closed proximal end of the stopper-piston.

2. The system of claim 1 , wherein said interior chamber of said vessel comprises an anesthetic, and said interior chamber of said stopper-piston comprises a buffering reagent.

3. The system of claim 1 , wherein the syringe comprises a dental syringe, the vessel comprising a shape that allows use with the dental syringe.

4. The system of claim 1 , wherein the distal end of the vessel is open and sealed by a sealing cap.

5. The system of claim 1 , wherein the stopper-piston comprises an elastomeric plastic or rubber.

6. The system of claim 4 , wherein the stopper-piston slides within the hollow interior chamber of the vessel.

7. The system of claim 4 , wherein the harpoon pierces the stopper-piston and dislodges the dislodgeable plug when the mixing vial is loaded into or placed in the syringe.

8. The system of claim 7 , wherein said interior chamber of said vessel comprises an anesthetic, and said interior chamber of said stopper-piston comprises a buffering reagent, and the anesthetic and the buffering reagent are mixed.

9. The system of claim 1 , wherein the plug dislodging force is less than the a force necessary to penetrate the dislodgeable plug.

10. The system of claim 1 , wherein the dislodgeable plug includes a strike plate, wherein the dislodgeable plug is disposed within the open distal end of the stopper-piston such that the strike plate faces the hollow interior chamber of the stopper-piston, the strike plate being configured to resist penetration by the harpoon when the harpoon is used to dislodge the dislodgeable plug.