A LIQUEFACTION HANDPIECE

摘要

A surgical handpiece having at least two lumens mounted to a body. At least one lumen is used for aspiration and at least one other lumen is used to inject heated surgical fluid for liquefying a cataractous lens. A portion of the second lumen is enlarged to form a pumping chamber. The pumping chamber works by boiling a small volu me of the surgical fluid. As the fluid boils, it expands rapidly, thereby propelli ng the liquid downstream of the pumping chamber out of the second lumen. The pumping chamb er may use a pair of electrodes, and one of the electrodes may contain a countersink.