Phaco driver system, a method and a computer program product
AssigneeD.O.R.C. Dutch Ophthalmic Research Center (International) B.V.
InventorsKees BIJKERK, Pieter VAN 'T HOF, John Peter KUNTZ, Alejandro Enrique VITERI VOGEL
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Abstract
The invention relates to a phaco driver system for controlling operation of an ophthalmic surgical phacoemulsification device. The phaco driver system comprises a resonant output circuit for generating a transducer voltage for driving an ultrasonic transducer of the ophthalmic surgical phacoemulsification device. Further, the phaco driver system includes a bridge unit for generating a bridge output signal for feeding the resonant output circuit, the bridge output signal being based on a composition of the first and second phase signals having a fixed mutual phase difference.
Claims11
A phaco driver system for controlling operation of an ophthalmic surgical phacoemulsification device, comprising:
- a resonant output circuit for generating a transducer voltage for driving an ultrasonic transducer of the ophthalmic surgical phacoemulsification device;
- a control unit for generating:
- a frequency command signal having a frequency based on a phase difference between a sensed current signal and a sensed voltage signal in the resonant output circuit, and
- an amplitude command signal based on a time averaged product of the sensed current signal and the sensed voltage signal;
- a phase shift unit for generating a first phase signal and a second phase signal based on the frequency command signal, the first and second phase signals having the same frequency and a fixed mutual phase difference;
- a bridge unit for generating a bridge output signal for feeding the resonant output circuit, the bridge output signal being based on a composition of the first and second phase signals, and
- a power supply unit for generating a power supply to the bridge unit, the power supply being controlled by the amplitude command signal.
A method for controlling operation of an ophthalmic surgical phacoemulsification device, comprising the steps of:
- generating, using a resonant output circuit, a transducer voltage for driving an ultrasonic transducer of the ophthalmic surgical phacoemulsification device;
- generating a frequency command signal having a frequency based on a phase difference between a sensed current signal and a sensed voltage signal in the resonant output circuit;
- generating an amplitude command signal having an amplitude that is based on a time averaged product of the sensed current signal and the sensed voltage signal;
- generating a first phase signal and a second phase signal based on the frequency command signal, the first and second phase signals having the same frequency and a fixed mutual phase difference;
- generating a power supply to a bridge unit, the power supply being proportional to the amplitude of the amplitude command signal, and
- generating, using the bridge unit, a bridge output signal for feeding the resonant output circuit, the bridge output signal being based on a composition of the first and second phase signals.
A computer program product for controlling operation of an ophthalmic surgical phacoemulsification device, the computer program product comprising computer readable code for causing a processor to perform the steps of:
- generating, using a resonant output circuit, a transducer voltage for driving an ultrasonic transducer of the ophthalmic surgical phacoemulsification device;
- generating a frequency command signal having a frequency based on a phase difference between a sensed current signal and a sensed voltage signal in the resonant output circuit;
- generating an amplitude command signal having an amplitude that is based on a time averaged product of the sensed current signal and the sensed voltage signal;
- generating a first phase signal and a second phase signal based on the frequency command signal, the first and second phase signals having the same frequency and a fixed mutual phase difference;
- generating a power supply to a bridge unit, the power supply being proportional to the amplitude of the amplitude command signal, and
- generating, using the bridge unit, a bridge output signal for feeding the resonant output circuit, the bridge output signal being based on a composition of the first and second phase signals.
Dependencies are inferred from the claim text.