System and method for tissue sealing
First Claim
1. A method for performing electrosurgical tissue fusion comprising the steps of:
- closing a pair of jaw members of an electrosurgical instrument about tissue;
applying electrosurgical energy at an output level to tissue from an electrosurgical generator;
determining whether tissue reaction has occurred as a function of a minimum impedance value and a predetermined rise in impedance, wherein tissue reaction corresponds to a boiling point of tissue fluid;
generating a target impedance trajectory as a function of measured impedance and desired rate of change based on the tissue reaction determination, the target impedance trajectory including a plurality of target impedance values;
determining whether a negative deviation between the measured tissue impedance and a corresponding target impedance value associated with an unexpected drop in tissue impedance has occurred for more than a predetermined amount of time, wherein if the negative deviation is detected for more than the predetermined amount of time the processor recalculates and generates a subsequent target impedance trajectory to compensate for the negative deviation;
interrupting the application of electrosurgical energy to tissue;
cooling the tissue; and
releasing the jaw members of the electrosurgical instrument from tissue.
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Accused Products
Abstract
An electrosurgical system is disclosed. The electrosurgical system includes an electrosurgical generator adapted to supply electrosurgical energy to tissue. The electrosurgical generator includes impedance sensing circuitry which measures impedance of tissue, a processor configured to determine whether a tissue reaction has occurred as a function of a minimum impedance value and a predetermined rise in impedance, wherein tissue reaction corresponds to a boiling point of tissue fluid, and an electrosurgical instrument including at least one active electrode adapted to apply electrosurgical energy to tissue. A tissue cooling period is provided to enhance operative outcomes.
2052 Citations
21 Claims
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1. A method for performing electrosurgical tissue fusion comprising the steps of:
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closing a pair of jaw members of an electrosurgical instrument about tissue; applying electrosurgical energy at an output level to tissue from an electrosurgical generator; determining whether tissue reaction has occurred as a function of a minimum impedance value and a predetermined rise in impedance, wherein tissue reaction corresponds to a boiling point of tissue fluid; generating a target impedance trajectory as a function of measured impedance and desired rate of change based on the tissue reaction determination, the target impedance trajectory including a plurality of target impedance values; determining whether a negative deviation between the measured tissue impedance and a corresponding target impedance value associated with an unexpected drop in tissue impedance has occurred for more than a predetermined amount of time, wherein if the negative deviation is detected for more than the predetermined amount of time the processor recalculates and generates a subsequent target impedance trajectory to compensate for the negative deviation; interrupting the application of electrosurgical energy to tissue; cooling the tissue; and releasing the jaw members of the electrosurgical instrument from tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for fusing biologic tissue comprising the steps of:
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providing an electrosurgical instrument including; at least one active electrode adapted to apply electrosurgical energy to tissue; and a pair of jaw members configured to grasp tissue; providing an electrosurgical instrument adapted to supply electrosurgical energy to the at least one active electrode, the electrosurgical generator including; impedance sensing circuitry configured to measure impedance of tissue; providing a processor in operable communication with the electrosurgical instrument; closing a pair of jaw members of an electrosurgical instrument about tissue; applying electrosurgical energy to tissue from an electrosurgical generator; determining whether tissue reaction has occurred as a function of a minimum impedance value and a predetermined rise in impedance; generating a target impedance trajectory as a function of measured impedance and desired rate of change based on the tissue reaction determination, the target impedance trajectory including a plurality of target impedance values; determining whether a final tissue impedance value was reached; responding to a determination that a final tissue impedance value was reached by; determining a cooling period in response to the tissue reaction; interrupting the application of electrosurgical energy to tissue to effectuate a cooling period; cooling the tissue during a cooling period; and indicating tissue fusing was successful; responding to a determination that a final tissue impedance value was not reached by; interrupting the application of electrosurgical energy to tissue; indicating tissue fusing was unsuccessful; and releasing the jaw members from tissue. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification