Devices and techniques for cutting and coagulating tissue
First Claim
1. A method of driving an end effector coupled to an ultrasonic drive system of a surgical instrument, the method comprising:
- providing, by a generator configured to drive the surgical instrument, a first electrical signal to an ultrasonic transducer acoustically coupled to the end effector;
detecting, by the generator, that an impedance of the ultrasonic transducer exceeds a threshold impedance;
storing, by the generator, a first local resonant frequency of the first electrical signal as a baseline resonant frequency;
monitoring, by the generator, the first electrical signal against a first set of logic conditions comprising a first logic condition and a second logic condition, wherein the first logic condition is defined by a difference between a second local resonant frequency of the first electrical signal and the baseline resonant frequency that is greater than a baseline deviation threshold;
determining, by the generator, that the first logic condition is met; and
triggering, by the generator, a first response.
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Accused Products
Abstract
Various forms are directed to systems and methods for driving an end effector coupled to an ultrasonic drive system of a surgical instrument. A generator may generate at least one electrical signal. The at least one electrical signal may be monitored against a first set of logic conditions. When an ultrasonic impedance of the surgical instrument exceeds a threshold impedance, a resonant frequency of the at least one electrical signal may be stored as a baseline frequency. A first response of the generator may be triggered upon the occurrence of either the first set of logic conditions being met or the resonant frequency of the at least one electrical signal differing from the baseline frequency by a baseline deviation threshold.
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Citations
21 Claims
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1. A method of driving an end effector coupled to an ultrasonic drive system of a surgical instrument, the method comprising:
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providing, by a generator configured to drive the surgical instrument, a first electrical signal to an ultrasonic transducer acoustically coupled to the end effector; detecting, by the generator, that an impedance of the ultrasonic transducer exceeds a threshold impedance; storing, by the generator, a first local resonant frequency of the first electrical signal as a baseline resonant frequency; monitoring, by the generator, the first electrical signal against a first set of logic conditions comprising a first logic condition and a second logic condition, wherein the first logic condition is defined by a difference between a second local resonant frequency of the first electrical signal and the baseline resonant frequency that is greater than a baseline deviation threshold; determining, by the generator, that the first logic condition is met; and triggering, by the generator, a first response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A surgical system, comprising:
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a surgical instrument, comprising; an end effector; and an ultrasonic transducer coupled to the end effector; and at least one circuit configured to; store a first resonant frequency of a drive signal provided to the ultrasonic transducer as a baseline resonant frequency after an impedance of the ultrasonic transducer exceeds a threshold impedance; monitor the drive signal against a first set of logic conditions comprising a first logic condition and a second logic condition, wherein the first logic condition is defined by a difference between a second resonant frequency of the drive signal and the baseline resonant frequency that is greater than a baseline deviation threshold; determine that the first logic condition is met; and trigger a first response.
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12. A method of driving an end effector coupled to an ultrasonic drive system of a surgical instrument, the method comprising:
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providing, by a generator configured to drive the surgical instrument, an electrical signal to an ultrasonic transducer coupled to the end effector; detecting, by the generator, that an impedance of the ultrasonic transducer exceeds a threshold impedance; capturing, by the generator, a first resonant frequency of the electrical signal as a baseline resonant frequency; detecting, by the generator, a load event at the end effector; and monitoring, by the generator, the electrical signal against a first set of logic conditions comprising a first logic condition and a second logic condition, wherein the first logic condition is defined by a difference between a second resonant frequency of the electrical signal and the baseline resonant frequency that is greater than a baseline deviation threshold; determining, by the generator, that the first logic condition is met; and triggering, by the generator, a first response. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification