Implantable cardiac stimulating device incorporating high frequency low amplitude lead impedance measurement
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United States of America Patent
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Sep 3, 2002
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N/A
app pub date -
Oct 12, 1999
filing date -
Oct 12, 1999
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Abstract
An implantable cardiac stimulating device incorporating high voltage leads for the delivery of cardioversion or defibrillation waveforms is provided. The implantable cardiac stimulating device incorporates a lead impedance measurement which measures the impedance of the high voltage lead using a high frequency, e.g., 20 KHz or higher, low amplitude, e.g., 500 microamps or lower, signal which results in a lead impedance measurement that has a high degree of correlation to the lead impedance that would occur when the high voltage defibrillation or cardioversion waveform is applied to the heart from the electrode. The implantable cardiac stimulating device is further configured to take corrective action upon the detection of a lead having a high or low impedance that suggests a broken, shorted or damaged lead.
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