FLOW CONTROL SYSTEM BASED ON LEAKAGE

摘要

An ophthalmic surgical (100) system utilizes a needle (128) through which fluid is aspirated from a surgical sit (110) e, and a sleeve (122) coaxially received over the needle to define a flow passage (126) between the sleeve and needle through which fluid is communicated to the surgical site. The system further includes a container (130) that provides an adjustable infusion pressure. An aspiration pump (140) urges aspiration of fluid from the surgical site, and a sensor (160) detects the rate of aspiration flow. A controller (200) is configured to calculate an intraocular eye pressure based on the infusion pressure and a pressure drop due to a resistance to the flow rate, which flow includes the sensed flow rate and a predicted leakage selected from a look-up table based on a size of the needle (128), a size of a sleeve (122), and a size of an incision (112) through which the needle and the sleeve are placed.