Ultrasonic device for cutting and coagulating with stepped output
First Claim
1. A method of determining a change in tissue state in an ultrasonic surgical instrument, the method comprising:
- sampling, by a processor, one or more drive signals of a generator for driving an ultrasonic transducer;
calculating, by the processor, a first weighted moving average of at least one of the sampled drive signals;
calculating, by the processor, a slope of the calculated first moving average of at least one of the sampled drive signals;
calculating, by the processor, a second weighted moving average for the slope of the sampled drive signal;
calculating, by the processor, a moving average for the slope;
comparing, by the processor, the second weighted moving average for the slope and the moving average for the slope; and
determining, by the processor, the occurrence of a change in tissue state based on the comparison.
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Accused Products
Abstract
Various embodiments are directed to an apparatus, system, and method for driving an end effector coupled to an ultrasonic transducer. The method comprises generating a first ultrasonic drive signal by a generator coupled to an ultrasonic drive system, actuating the ultrasonic transducer with the first ultrasonic drive signal, generating a second ultrasonic drive signal by the generator, and actuating the ultrasonic transducer with the second ultrasonic drive signal. The first drive signal is different from the second drive signal. The first and second drive signals define a step function waveform. The apparatus comprises a generator configured to couple to an ultrasonic instrument. The system comprises a generator coupled to an ultrasonic instrument. The ultrasonic instrument comprises an ultrasonic drive system comprising an ultrasonic transducer coupled to a waveguide and an end effector coupled to the waveguide, and wherein the ultrasonic drive system resonates at a resonant frequency.
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Citations
22 Claims
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1. A method of determining a change in tissue state in an ultrasonic surgical instrument, the method comprising:
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sampling, by a processor, one or more drive signals of a generator for driving an ultrasonic transducer; calculating, by the processor, a first weighted moving average of at least one of the sampled drive signals; calculating, by the processor, a slope of the calculated first moving average of at least one of the sampled drive signals; calculating, by the processor, a second weighted moving average for the slope of the sampled drive signal; calculating, by the processor, a moving average for the slope; comparing, by the processor, the second weighted moving average for the slope and the moving average for the slope; and determining, by the processor, the occurrence of a change in tissue state based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An ultrasonic surgical instrument configured to determine a change in tissue state, the ultrasonic surgical instrument comprising:
a processor operative to; sample one or more drive signals output by a generator; calculate a first weighted moving average of at least one of the sampled drive signals; calculate a slope of the calculated first moving average of at least one of the sampled drive signals; calculate a second weighted moving average for the slope of the sampled drive signal; calculate a moving average for the slope; compare the second weighted moving average for the slope and the moving average for the slope; and determine the occurrence of a change in tissue state based on the comparison. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
Specification