System and method for tissue sealing
First Claim
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1. An electrosurgical tissue fusion system comprising:
- an electrosurgical instrument including at least one active electrode adapted to apply electrosurgical energy to tissue; and
an electrosurgical generator 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; and
a processor configured to;
regulate the supply of electrosurgical energy to tissue;
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 wherein a timer is associated with the rise in impedance, an expiration of the timer setting off an alarm by the generator, the alarm prompting a re-grasp of tissue, whereas non-expiration of the timer triggers the generator to generate a ramping of current in an outer loop and a constant current in an inner loop of a current control curve;
determine a cooling period in response to the tissue reaction;
interrupt the supply of electrosurgical energy to tissue to effectuate the cooling period; and
indicate expiration of the cooling period.
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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 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.
963 Citations
25 Claims
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1. An electrosurgical tissue fusion system comprising:
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an electrosurgical instrument including at least one active electrode adapted to apply electrosurgical energy to tissue; and an electrosurgical generator 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; and a processor configured to; regulate the supply of electrosurgical energy to tissue; 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 wherein a timer is associated with the rise in impedance, an expiration of the timer setting off an alarm by the generator, the alarm prompting a re-grasp of tissue, whereas non-expiration of the timer triggers the generator to generate a ramping of current in an outer loop and a constant current in an inner loop of a current control curve; determine a cooling period in response to the tissue reaction; interrupt the supply of electrosurgical energy to tissue to effectuate the cooling period; and indicate expiration of the cooling period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification