Patent ID: 7217257

Claim:
An ophthalmic surgery system comprising: a surgical control console; an irrigation device; a surgical instrument for performing an surgical operation on an eye and connected to the irrigation device and the instrument is controlled by the console; an aspiration device connected to the surgical instrument for aspirating fluid and tissue from the eye to a collection cassette associated with the aspiration device; and an aspiration flow resistor connected between the aspiration device and the surgical instrument wherein the resistor includes: an inlet and an outlet; a housing connected to the inlet and outlet; a series of spaced walls disposed between the inlet and outlet, wherein each wall has at least one orifice for allowing aspirant to follow through the wall; wherein the walls and the inlet and outlet together with the housing define a plurality of aspiration flow chambers such that as aspirant flows from the inlet to the outlet a pressure decrease in the aspirant flow occurs at each wall and therefore provides resistance to aspirant flow.