System and method for tissue sealing
First Claim
1. An electrosurgical generator for tissue fusion, comprising:
- an RF output stage adapted to supply electrosurgical energy to tissue to an electrosurgical instrument, wherein the electrosurgical instrument includes at least one active electrode adapted to apply electrosurgical energy to tissue;
impedance sensing circuitry configured to measure impedance of tissue; and
a processor 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;
generate a target impedance trajectory as a function of measured impedance and desired rate of change based on the tissue reaction determination, wherein the target impedance trajectory includes a plurality of target impedance values;
detect a negative deviation between the measured tissue impedance and a corresponding target impedance value associated with an unexpected drop in tissue impedance, wherein if the negative deviation is detected for more than a predetermined time period the processor recalculates and generates a subsequent reset impedance trajectory to compensate for the negative deviation, the reset impedance trajectory configured to mirror the target impedance trajectory;
interrupt the supply of electrosurgical energy to tissue to effectuate a cooling period; and
indicate expiration of the cooling period.
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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.
840 Citations
20 Claims
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1. An electrosurgical generator for tissue fusion, comprising:
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an RF output stage adapted to supply electrosurgical energy to tissue to an electrosurgical instrument, wherein the electrosurgical instrument includes at least one active electrode adapted to apply electrosurgical energy to tissue; impedance sensing circuitry configured to measure impedance of tissue; and a processor 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; generate a target impedance trajectory as a function of measured impedance and desired rate of change based on the tissue reaction determination, wherein the target impedance trajectory includes a plurality of target impedance values; detect a negative deviation between the measured tissue impedance and a corresponding target impedance value associated with an unexpected drop in tissue impedance, wherein if the negative deviation is detected for more than a predetermined time period the processor recalculates and generates a subsequent reset impedance trajectory to compensate for the negative deviation, the reset impedance trajectory configured to mirror the target impedance trajectory; interrupt the supply of electrosurgical energy to tissue to effectuate a 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)
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Specification