Method for determining absolute current density through an implanted electrode
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United States of America Patent
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Jul 31, 1990
Grant Date -
N/A
app pub date -
Jun 16, 1988
filing date -
Jun 16, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for determining absolute current density through an implanted electrode measures the fundamental and harmonic components of an electrical current passing through the electrode and estimates the absolute current density from the ratio between the magnitude of the electrical current measured at one of the harmonics on the fundamental frequency. Another method of the invention applies a wideband noise input voltage to the electrode under investigation and measures the spectrum of the input voltage and output current to determine a first transfer function. A second transfer function representing an increase magnitude of wideband noise input voltage is also obtained. A difference transfer function is computed and used to determine absolute current density through the electrode. The methods may be practiced non-invasively.
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