Low energy or minimum disturbance method for measuring frequency response functions of ultrasonic surgical devices in determining optimum operating point
First Claim
1. An ultrasonic system, comprising:
- an ultrasonic device configured to impart ultrasonic energy to tissue; and
an ultrasonic generator configured to supply power to the ultrasonic device, the ultrasonic generator comprising;
a controllable drive signal generator configured to provide a drive signal;
a controllable noise signal generator configured to provide a noise signal, wherein the noise signal is a pseudo random noise sequence;
an adder configured to combine the drive signal and the noise signal;
an amplifier having a gain, the amplifier configured to amplify the combined drive signal and noise signal and provide the amplified signal to the ultrasonic device; and
a controller configured to;
receive an output signal from the ultrasonic device and the noise signal from the noise signal generator, calculate a transfer function estimate based on the output signal and the noise signal, adjust the drive signal generator based on the calculated transfer function estimate, and determine a phase difference by time aligning a noise signal in the output signal with the noise signal provided by the noise generator.
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Accused Products
Abstract
An ultrasonic system is provided that includes an ultrasonic device having an elongated member configured to impart ultrasonic energy to tissue and a resonator configured to impart a frequency to the elongated member. The system also includes an ultrasonic generator configured to supply power to the resonator of the ultrasonic device. The ultrasonic generator has a drive signal generator configured to provide a drive signal, a noise signal generator configure to provide a noise signal, and a controller. The controller receives an output signal from the ultrasonic device and the noise signal from the noise signal generator, calculates a transfer function based on the output signal and the noise signal, and adjusts the drive signal generator based on the calculated transfer function.
271 Citations
8 Claims
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1. An ultrasonic system, comprising:
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an ultrasonic device configured to impart ultrasonic energy to tissue; and an ultrasonic generator configured to supply power to the ultrasonic device, the ultrasonic generator comprising; a controllable drive signal generator configured to provide a drive signal; a controllable noise signal generator configured to provide a noise signal, wherein the noise signal is a pseudo random noise sequence; an adder configured to combine the drive signal and the noise signal; an amplifier having a gain, the amplifier configured to amplify the combined drive signal and noise signal and provide the amplified signal to the ultrasonic device; and a controller configured to; receive an output signal from the ultrasonic device and the noise signal from the noise signal generator, calculate a transfer function estimate based on the output signal and the noise signal, adjust the drive signal generator based on the calculated transfer function estimate, and determine a phase difference by time aligning a noise signal in the output signal with the noise signal provided by the noise generator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An ultrasonic generator configured to supply power to an ultrasonic device, the ultrasonic generator comprising:
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a drive signal generator configured to provide a drive signal; a noise signal generator configure to provide a noise signal; an adder configured to combine the drive signal and the noise signal; an amplifier having a gain configured to amplify the combined signal; and a controller configured to; receive an output signal from the ultrasonic device and the noise signal from the noise signal generator, calculate a transfer function estimate based on the output signal, the noise signal and the gain, adjust the drive signal generator based on the calculated transfer function estimate, and determine a phase difference by time aligning a noise signal in the output signal with the noise signal provided by the noise generator.
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Specification