Phacoemulsification probe circuit with pulse width Modulating dr

Details Phacoemulsification probe circuit with pulse width Modulating dr Phacoemulsification probe circuit with pulse width Modulating dr

1993-07-29

1994-12-06

Cohen, Lee S.

Surgery: kinesitherapy

Kinesitherapy

Ultrasonic

606127, 606128, 604 22, A61F 900, A61B 810

Patent

active

053706021

ABSTRACT:
A drive for a phacoemulsification probe includes a drive circuit for supplying electrical power to the probe, circuitry for sensing the electrical power supplied by the drive circuit to the probe and for supplying electrical signals indicative of the magnitude of the electrical power supplied. A manually operable input device provides a signal indicative of the transducer power level desired by the user of the probe. A control circuit is responsive to the signal indicative of the desired transducer power level and to the signals indicative of the magnitude of the supplied electrical power for providing control signals to the drive circuit to control the power applied in an efficient manner. The drive circuit includes a voltage controlled oscillator, responsive to at least one of the control signals, connected to a class S amplifier. The output of the class S amplifier is filtered before application to the probe transducer. The drive circuit has high efficiency when compared to prior art probe drives.

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P. J. Baxandall, B.Sc. English, Transistor Sine-Wave LC Oscillators Feb. 1960.

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