System and method for tissue sealing
First Claim
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1. An electrosurgical system comprising:
- an electrosurgical generator adapted to supply electrosurgical energy to tissue, the electrosurgical generator including;
impedance sensing circuitry which measures impedance of tissue; and
a microprocessor 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,wherein when measured impedance is greater than the predetermined rise in impedance, the microprocessor is configured to generate a target impedance trajectory as a function of the measured impedance and a predefined rate of change of impedance based on the tissue reaction determination, the target impedance trajectory including a plurality of target impedance values.
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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 microprocessor 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.
1026 Citations
19 Claims
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1. An electrosurgical system comprising:
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an electrosurgical generator adapted to supply electrosurgical energy to tissue, the electrosurgical generator including; impedance sensing circuitry which measures impedance of tissue; and a microprocessor 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, wherein when measured impedance is greater than the predetermined rise in impedance, the microprocessor is configured to generate a target impedance trajectory as a function of the measured impedance and a predefined rate of change of impedance based on the tissue reaction determination, the target impedance trajectory including a plurality of target impedance values. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for performing an electrosurgical procedure comprising the steps of:
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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; determining whether measured impedance is greater than the predetermined rise in impedance; and generating a target impedance trajectory as a function of the measured impedance and a predefined rate of change of impedance based on the tissue reaction determination, the target impedance trajectory including a plurality of target impedance values. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An electrosurgical generator comprising:
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an RF output stage adapted to supply electrosurgical energy to tissue; impedance sensing circuitry which measures impedance of tissue; a microprocessor configured to determine 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, wherein when measured impedance is greater than the predetermined rise in impedance the microprocessor being configured to generate a target impedance trajectory as a function of measured impedance and a predefined rate of change of impedance based on the tissue reaction determination, wherein the target impedance trajectory includes a plurality of target impedance values; and an electrosurgical instrument including at least one active electrode adapted to apply electrosurgical energy to tissue. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification