Computerstyret intelligent phacoemulgeringsapparat

摘要

A method and apparatus for operating on the human eye detects changes in load, more specifically, mechanical impedance, of the transducer (300) and controls aspiration based on the load changes. A change from a lower load to a higher load indications that harder tissue is being encountered and accordingly causes aspiration amount to increase. Conversely, a change from a higher load to a lower load indicates that aspiration amount should be quickly decreased since the tissue which is being encountered is softer. One way to detect the impedance is by a sensor (1008), i.e., a piezoelectric element coupled to the operating needle detecting the movement thereof.