Patent ID: 9486359
Filing Date: 2016-11-08
CPC Classification: A61B,A61F

Claim Text:
1. A control arrangement for an ophthalmic surgical system for phacoemulsification of an eye lens, the ophthalmic surgical system including a phacoemulsification handpiece having a needle; and, an ultrasound energy source for supplying ultrasound energy to said phacoemulsification handpiece; said control arrangement comprising: an optical system for generating an image of an object region wherein at least a part of said eye lens and a part of said needle are arranged; an image evaluation unit configured to evaluate said image so as to determine at least one evaluation variable dependent upon a characteristic of a particle of said eye lens generated by phacoemulsification or a relation of said particle to its surroundings; a control unit operatively connected to said image evaluation unit for receiving said evaluation variable; said control unit being configured to generate a control variable in dependence upon said evaluation variable and, with said control variable, control an absolute value of said ultrasound energy for the phacoemulsification of said eye lens; said evaluation variable being a geometric measurement variable of said particle of said eye lens to be emulsified; and, said geometric measurement variable being the area or the circumference or the volume of the particle to be emulsified in said image, wherein said optical system includes a light microscope and/or an optical coherence tomography (OCT) system.