Appeal No. 98-0194 Page 13
Application No. 08/132,940
Figure 3 of Ensslin illustrates a typical system utilized for
electrosurgical procedures but modified by the inclusion of
components useful for the practice of his invention. An
electrosurgical generator 30 has terminals 31, 32 to which are
connected a dispersive patient plate electrode 35 and an
electrosurgical instrument electrode 36, respectively.
Conductors 33 and 34 extend from terminals 31 and 32,
respectively, to connect the dispersive patient plate electrode
35 and the electrosurgical instrument electrode 36 as shown.
Current flowing through the circuit is detected at conductor 33
by means of a current transformer device 45, the leads 47, 49
of which are connected to the terminals 51, 53, respectively,
of an analog to digital converter device 55. An output 57 from
the converter 55 is fed to a central processing unit 60
(referred to hereinafter as a "CPU"). The CPU 60 is connected
by an input cable 63 and an output cable 65 to the
electrosurgical generator 30. The CPU 60 is programmed to
recognize the power setting (percent maximum power) of the
generator 30, and to determine the actual load impedance of the
circuit from the detected current value by reference to the
mathematical relationship between current and impedance
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Last modified: November 3, 2007