Method for driving an ultrasonic handpiece with a class D amplifier
First Claim
1. A method for controlling an ultrasonic handpiece of a phacoemulsification surgical system, the method comprising:
- providing a first signal at a first frequency and a second signal at a second frequency as inputs to a class D amplifier; and
driving the ultrasonic handpiece using the output of the class D amplifier, the output of the class D amplifier having at least two frequency components that simultaneously move a cutting tip of the ultrasonic handpiece in different directions.
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Accused Products
Abstract
Method for controlling an ultrasonic handpiece of an ocular surgical system, such as a phacoemulsification system. First and second signal sources generate first and second drive signals. The first signal is at a first frequency and is used to drive a cutting tip of the handpiece with a first type of motion. The second signal is at a second frequency and is used to drive the cutting tip with a second type of motion. The different motions can be generated with different first and second frequencies. The first and second signals can be summed or combined and provided to a class D amplifier, the output of which includes multiple frequency components or multiple signals of different frequencies to drive the cutting tip in different directions at the same time, for example, with simultaneous longitudinal and torsional motions.
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Citations
23 Claims
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1. A method for controlling an ultrasonic handpiece of a phacoemulsification surgical system, the method comprising:
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providing a first signal at a first frequency and a second signal at a second frequency as inputs to a class D amplifier; and
driving the ultrasonic handpiece using the output of the class D amplifier, the output of the class D amplifier having at least two frequency components that simultaneously move a cutting tip of the ultrasonic handpiece in different directions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for controlling an ultrasonic handpiece of a phacoemulsification surgical system, the method comprising:
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providing a first signal at a first frequency to a class D amplifier, the first signal controlling longitudinal motion of a cutting tip of the ultrasonic handpiece;
providing a second signal at a second frequency to the class D amplifier, the second signal controlling torsional motion of the cutting tip;
driving the handpiece with an output of the class D amplifier so that the cutting tip of the handpiece moves with combined longitudinal and torsional motions. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for controlling an ultrasonic handpiece of a phacoemulsification surgical system, the method comprising:
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providing a first sinusoidal signal as an input to a class D amplifier, the first sinusoidal signal being at a frequency of about 40 kHz to about 45 kHz and controlling longitudinal motion of a cutting tip of the ultrasonic handpiece;
providing a second sinusoidal signal as an input to the class D amplifier, the second sinusoidal signal being at a frequency of about 30-34 kHz and controlling torsional motion of the cutting tip;
amplifying the first and second sinusoidal signals with the class D amplifier; and
driving the ultrasonic handpiece with the output of the class D amplifier so that the cutting tip moves with longitudinal and torsional motions at the same time. - View Dependent Claims (21, 22)
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23. A method for controlling an ultrasonic handpiece of a phacoemulsification surgical system, the method comprising:
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providing a first signal and a second signal as inputs to a class D amplifier, the first and second signals being different frequencies;
driving the handpiece with an output of the class D amplifier, wherein the class D amplifier switches between a first output at a first frequency corresponding to the first input and a second output at a second frequency corresponding to the second input to move the cutting tip in different directions at different times.
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Specification