Device for monitoring a neutral electrode during HF surgery
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United States of America Patent
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Aug 14, 2001
Grant Date -
N/A
app pub date -
Dec 22, 1999
filing date -
Apr 10, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
The invention refers to a device for monitoring the application of a neutral electrode in unipolar HF surgery, having an impedance sensor with a resonant circuit comprising a secondary coil of a transformer and HF input capacitors of preferably two partial electrode surfaces. The impedance sensor detects the transient impedances of two partial electrode surfaces connected in series with the patient's tissues by application of a patient auxiliary current and is moderated by the transition impedances. The invention is characterized in that the resonant circuit is excited by alternating voltages of variable frequencies in the range of a resonant frequency, and in that a peak value detector is provided which detects an alternating voltage peak value at the resonant frequency. The disclosed device excites the resonant circuit in such a manner that a faultless measurement of the transition impedance at the level of the patient's tissues is made possible.
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