Patent ID: 7951108

Claim:
A mixing syringe comprising: a needle; a housing defining a first chamber that includes a first component of a mixture therein, wherein the needle is attached to the housing, and wherein the housing comprises a valve configured to selectively seal a pathway between the first chamber and the needle; a first plunger configured to slide within the housing, wherein the first plunger defines a second chamber that includes a second component of the mixture therein; a plunger rod including a rib that forms a fluid tight seal in a closed state and a side port providing a fluid passageway in an open state, the first component separated from the second component in the closed state; and a second plunger configured to slide within the first plunger; wherein the first plunger is configured to transfer the first component from the first chamber to the second chamber when the fluid passageway is in the open state and the first plunger is displaced forwardly, wherein the second plunger is configured to transfer the second component from the second chamber to the first chamber when the fluid passageway is in the open state and the second plunger is displaced forwardly, and wherein the valve is configured to seal the pathway between the first chamber and the needle to permit mixing of the first component and the second component and to be opened to permit the mixed first and second components to pass through the pathway.