Method and measurement apparatus for determining the transition impedance between two parts of a subdivided neutral electrode
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United States of America Patent
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Sep 16, 2008
Grant Date -
Sep 27, 2007
app pub date -
May 20, 2005
filing date -
May 25, 2004
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Abstract
A method and a measurement apparatus are provided for determining the transition impedance between two electrode parts of a subdivided neutral electrode used in high-frequency surgery. These make it possible for the purely capacitive component of the transition impedance to be measured. For this purpose a resonant-frequency shift is measured, which occurs when a basic resonant circuit is expanded to an expanded resonant circuit by incorporating the two electrode parts into it in parallel. In particular, in order to determine the basic resonant frequency of the basic resonant circuit and/or the sample resonant frequency of the expanded resonant circuit, the phase shift between current and voltage is measured and the frequency is adjusted until current and voltage are in phase.
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