A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
326/15
A61B 18/12 (2006.01)
Patent
CA 1099789
ABSTRACT An electrosurgical unit having a feedback control circuit for providing control of the power amplifier of the unit so power delivered to tissue presented between the active and return electrodes of the unit will be substan- tially constant over the range of impedance presented by various tissues that are encountered. The feedback signal to the power amplifier is determined from a comparison of a power level reference signal and the mathematical product of two signals which are derived from a sensed current in the unit that is directly related to current delivered to tissue and a sensed voltage that is directly related to voltage delivered to tissue. A non-linear compensation circuit in the feedback circuit corrects for non-linearities introduced by components selected for the circuit.
294306
Minnesota Mining And Manufacturing Company
Smart & Biggar
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