Computer controlled smart phacoemulsification method and...

A - Human Necessities – 61 – F

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A61F 9/00 (2006.01) A61F 9/007 (2006.01) A61M 1/00 (2006.01) A61B 17/00 (2006.01) A61B 19/00 (2006.01) A61B 17/36 (1995.01)

Patent

CA 2099780

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 indicates 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), e.g., a piezoelectric element coupled to the operating needle detecting the movement thereof.

Un procédé et un appareil opérant sur l'oeil humain détectent les changements de charge, plus spécifiquement, l'impédance mécanique du transducteur (300) et régulent l'aspiration sur la base des changements de charge. Un changement d'une charge inférieure à une charge supérieure indique que des tissus plus durs sont rencontrés et par conséquent provoquent l'augmentation de l'aspiration. A l'inverse, un changement d'une charge supérieure à une charge inférieure indique que l'aspiration doit être rapidement réduite puisque les tissus rencontrés sont plus tendres. Une manière de détecter l'impédance consiste à utiliser un capteur (1008), par exemple, un élément piézoélectrique couplé à l'aiguille opératoire détectant son mouvement.

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