Surgery – Instruments – Electrical application
Patent
1994-09-23
1996-09-24
Sykes, Angela D.
Surgery
Instruments
Electrical application
606 34, 606 42, 606 50, A61B 1736
Patent
active
055586716
ABSTRACT:
An impedance monitoring device is provided for monitoring the electrical impedance of tissue as it is treated with electrosurgical energy. Based on a predicted model of tissue impedance and a number of initial impedance readings, the impedance at which tissue treatment is completed is predicted. More particularly, a minimum impedance level is measured and a function of the minimum impedance is used to determine impedance at which coagulation is completed. A control device is provided for bringing the output of the generator within an optimum range based on a system load curve. In one embodiment the impedance monitoring device is used in conjunction with a bipolar electrosurgical instrument. Preferably, the instrument comprises electrically opposite electrodes located on one or more tissue engaging surfaces for engaging tissue to be treated.
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Peffley Michael
Sykes Angela D.
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