Patent ID: 8852139

Claim:
An eye treatment method comprising: providing a phacoemulsification system comprising an irrigation conduit pathway, an aspiration pathway, a pump, wherein the pump is coupled with the aspiration pathway, and a pressure sensor, wherein the pressure sensor is coupled with the aspiration pathway; directing an irrigation flow into the eye through the irrigation conduit pathway; aspirating material from within the eye by drawing an aspiration flow through the aspiration conduit pathway with the pump; and sensing a pressure via the pressure sensor indicating pressure within the aspiration conduit pathway; providing a first correlation between the sensed pressure and a reverse pump speed, or between the sensed pressure and a reverse flow rate; providing a second correlation between the sensed pressure and the reverse pump speed, or between the sensed pressure and the reverse flow rate; reversing the pump to provide an initial reverse flow rate; based on the sensed pressure, selecting the first correlation or the second correlation, the sensed pressure being within a predetermined pressure range; and based on the selection, controlling the reverse pumping flow rate.