Generator for digitally generating combined electrical signal waveforms for ultrasonic surgical instruments
First Claim
1. A method of generating electrical signal waveforms by a generator, the generator comprising a digital processing circuit, a memory circuit in communication with the digital processing circuit, the memory circuit defining first and second lookup tables, a digital synthesis circuit in communication with the digital processing circuit and the memory circuit, and a digital-to-analog (DAC) circuit, the method comprising:
- storing, by the digital processing circuit, phase points of a first digital electrical signal waveform in the first lookup table defined by the memory circuit, wherein the first digital electrical signal waveform is represented by a first predetermined number of phase points, wherein the first predetermined number of phase points define a first predetermined wave shape;
storing, by the digital processing circuit, phase points of a second digital electrical signal waveform in the second lookup table defined by the memory circuit, wherein the second digital electrical signal waveform is represented by a second predetermined number of phase points, wherein the second predetermined number of phase points define a second predetermined wave shape; and
receiving a plurality of clock signals by the digital synthesis circuit, and at each clock cycle of the plurality of clock signals;
retrieving, by the digital synthesis circuit, a phase point from the first lookup table;
retrieving, by the digital synthesis circuit, a phase point from the second lookup table;
combining, by the digital processing circuit, the phase point from the first lookup table with the phase point from the second lookup table to generate a combined phase point; and
converting, by the DAC circuit, the combined phase point into a first analog signal;
transmitting the first analog signal to an ultrasonic transducer of a surgical instrument;
receiving, by the digital processing circuit, a feedback signal associated with tissue parameters at a surgical site of a patient during a surgical procedure, in response to the transmitted first analog signal;
modifying, in real time, the first or second predetermined wave shape according to the feedback signal to generate a third wave shape;
converting a combination of the third wave shape and either the first predetermined wave shape or the second predetermined wave shape into a second analog signal; and
transmitting the second analog signal to the ultrasonic transducer during the surgical procedure.
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Accused Products
Abstract
Disclosed is a method of generating electrical signal waveforms by a generator. The method includes storing phase points of first and second digital electrical signal waveforms in first and second lookup tables. The first and second digital electrical signal waveforms are represented by a predetermined number of phase points that define wave shapes. At each clock cycle, a digital synthesis circuit retrieves phase points from the first and second lookup tables and the digital processing circuit combines phase points from the first and second lookup tables. A digital-to-analog converter (DAC) circuit converts the combined phase point into an analog signal. The analog signal is configured to drive a first and second ultrasonic transducer.
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Citations
19 Claims
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1. A method of generating electrical signal waveforms by a generator, the generator comprising a digital processing circuit, a memory circuit in communication with the digital processing circuit, the memory circuit defining first and second lookup tables, a digital synthesis circuit in communication with the digital processing circuit and the memory circuit, and a digital-to-analog (DAC) circuit, the method comprising:
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storing, by the digital processing circuit, phase points of a first digital electrical signal waveform in the first lookup table defined by the memory circuit, wherein the first digital electrical signal waveform is represented by a first predetermined number of phase points, wherein the first predetermined number of phase points define a first predetermined wave shape; storing, by the digital processing circuit, phase points of a second digital electrical signal waveform in the second lookup table defined by the memory circuit, wherein the second digital electrical signal waveform is represented by a second predetermined number of phase points, wherein the second predetermined number of phase points define a second predetermined wave shape; and receiving a plurality of clock signals by the digital synthesis circuit, and at each clock cycle of the plurality of clock signals; retrieving, by the digital synthesis circuit, a phase point from the first lookup table; retrieving, by the digital synthesis circuit, a phase point from the second lookup table; combining, by the digital processing circuit, the phase point from the first lookup table with the phase point from the second lookup table to generate a combined phase point; and converting, by the DAC circuit, the combined phase point into a first analog signal; transmitting the first analog signal to an ultrasonic transducer of a surgical instrument; receiving, by the digital processing circuit, a feedback signal associated with tissue parameters at a surgical site of a patient during a surgical procedure, in response to the transmitted first analog signal; modifying, in real time, the first or second predetermined wave shape according to the feedback signal to generate a third wave shape; converting a combination of the third wave shape and either the first predetermined wave shape or the second predetermined wave shape into a second analog signal; and transmitting the second analog signal to the ultrasonic transducer during the surgical procedure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of generating electrical signal waveforms by a generator, the generator comprising a digital processing circuit, a memory circuit in communication with the digital processing circuit, the memory circuit defining first and second lookup tables, a digital synthesis circuit in communication with the digital processing circuit and the memory circuit, and a digital-to-analog converter (DAC) circuit, the method comprising:
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storing, by the digital processing circuit, phase points of a first digital electrical signal waveform in the first lookup table defined by the memory circuit, wherein the first digital electrical signal waveform is represented by a first predetermined number of phase points, wherein the first predetermined number of phase points define a first predetermined wave shape; storing, by the digital processing circuit, phase points of a second digital electrical signal waveform in the second lookup table defined by the memory circuit, wherein the second digital electrical signal waveform is represented by a second predetermined number of phase points, wherein the second predetermined number of phase points define a second predetermined wave shape; and receiving a plurality of clock signals by the digital synthesis circuit, and at each clock cycle of the plurality of clock signals; retrieving, by the digital synthesis circuit, a phase point from the first lookup table; retrieving, by the digital synthesis circuit, a phase point from the second lookup table; combining, by the digital processing circuit, the phase point from the first lookup table with the phase point from the second lookup table to generate a combined phase point; converting, by the DAC circuit, the combined phase point into a first analog signal; transmitting the first analog signal to an ultrasonic transducer of a surgical instrument; receiving, by the digital processing circuit, a feedback signal associated with tissue parameters at a surgical site of a patient during a surgical procedure, in response to the transmitted first analog signal; modifying, in real time, the first or second predetermined wave shape according to the feedback signal to generate a third wave shape; converting a combination of the third wave shape and either the first predetermined wave shape or the second predetermined wave shape into a second analog signal; and transmitting the second analog signal to the ultrasonic transducer during the surgical procedure. - View Dependent Claims (12, 13)
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14. A generator for generating electrical signal waveforms, the generator comprising:
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a digital processing circuit; a memory circuit in communication with the digital processing circuit, the memory circuit defining a first lookup table and a second lookup table; a digital synthesis circuit in communication with the digital processing circuit and the memory circuit, the digital synthesis circuit configured to receive a plurality of clock signals; and a digital-to-analog converter (DAC) circuit; the digital processing circuit configured to; store phase points of a first digital electrical signal waveform in the first lookup table defined by the memory circuit, wherein the first digital electrical signal waveform is represented by a first predetermined number of phase points, wherein the first predetermined number of phase points define a first predetermined wave shape; and store phase points of a second digital electrical signal waveform in the second lookup table defined by the memory circuit, wherein the second digital electrical signal waveform is represented by a second predetermined number of phase points, wherein the second predetermined number of phase points define a second predetermined wave shape; at each clock cycle of the plurality of clock signals, the digital synthesis circuit configured to; retrieve a phase point from the first lookup table; retrieve a phase point from the second lookup table; the digital processing circuit configured to; combine the phase point from the first lookup table with the phase point from the second lookup table to generate a combined phase point; and the DAC circuit configured to convert the combined phase point into a first analog signal; and transmit the first analog signal to an ultrasonic transducer of a surgical instrument; wherein the digital processing circuit is further configured to; receive a feedback signal associated with tissue parameters at a surgical site of a patient during a surgical procedure, in response to the transmitted first analog signal; modify, in real time, the first or second predetermined wave shape according to the feedback signal to generate a third wave shape; and convert a combination of the third wave shape and either the first predetermined wave shape or the second predetermined wave shape into a second analog signal; and wherein the DAC circuit is further configured to transmit the second analog signal to the ultrasonic transducer during the surgical procedure. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification