Impedance feedback monitor for electrosurgical instrument

Details Impedance feedback monitor for electrosurgical instrument Impedance feedback monitor for electrosurgical instrument

A - Human Necessities

61

B

A61B 18/12 (2006.01) A61B 5/053 (2006.01) A61B 18/14 (2006.01)

Patent

CA 2158783

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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