Allergan, Inc.

Abbott Medical Optics Inc.

Advanced Medical Optics, Inc.

Pravin V Mehta

Michael W Fellinger

David L Anderson

Nate G Elsen

George Bromfield

A phacoemulsification system includes a phacoemulsification handpiece including a cutting tip ultrasonically vibrated by an ultrasonic transducer. A power supply is provided for driving the ultrasonic transducer at a resonant frequency of the transducer and cutting tip and varying power to the transducer, in response to loading of the cutting tip, by phase shifting voltage and current supplied to the transducer.

Resonant converter tuning for maintaining substantial constant phaco handpiece power under increased load

A phacoemulsification system includes a phacoemulsification handpiece including a cutting tip ultrasonically vibrated by an ultrasonic transducer. A power supply is provided for driving the ultrasonic transducer at a resonant frequency of the transducer and cutting tip and varying power to the transducer, in response to loading of the cutting tip, by phase shifting drive signals to the resonant converter which supplies power to the transducer.

Resonant converter tuning for maintaining substantially constant phaco handpiece power under increased load

Handpiece apparatus is provided for disruption and removal of tissue, tumors, bone, cartilage, calculi or the like which includes an arrangement of piezoelectric crystals and a heat sink in order to control crystal temperature despite interruption of cooling irrigation flow through the handpiece.

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Huntington Beach, CA, United States of America

Pravin V Mehta