Method and measurement apparatus for determining the transition impedance between two parts of a subdivided neutral electrode
First Claim
1. Method of determining the transition impedance between two electrode parts of a subdivided neutral electrode for use in high-frequency surgery, by providing a resonant circuit into which said two electrode parts are incorporated in parallel with one another such that there is a transition impedance between them;
- measuring a resonant-frequency shift in said resonant circuit; and
determining the purely capacitive component of the transition impedance using said resonant-frequency shift.
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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 makes 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.
20 Citations
10 Claims
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1. Method of determining the transition impedance between two electrode parts of a subdivided neutral electrode for use in high-frequency surgery, by providing a resonant circuit into which said two electrode parts are incorporated in parallel with one another such that there is a transition impedance between them;
- measuring a resonant-frequency shift in said resonant circuit; and
determining the purely capacitive component of the transition impedance using said resonant-frequency shift. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- measuring a resonant-frequency shift in said resonant circuit; and
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10-16. -16. (canceled)
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