05558671 is referenced by 848 patents and cites 44 patents.

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.

Impedance feedback monitor for electrosurgical instrument
Application Number
Publication Number
Application Date
September 23, 1994
Publication Date
September 24, 1996
David C Yates
7534 Galway Ct., West Chester, 45069
A61B 17/36
View Original Source