RF FILTER FOR AN ACTIVE MEDICAL DEVICE (AMD) FOR HANDLING HIGH RF POWER INDUCED IN AN ASSOCIATED IMPLANTED LEAD FROM AN EXTERNAL RF FIELD
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United States of America Patent
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Issued Date -
Oct 11, 2012
app pub date -
Feb 29, 2012
filing date -
Mar 1, 2011
priority date (Note) -
Abandoned
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Abstract
An RF filter for an active medical device (AMD), for handling RF power induced in an associated lead from an external RF field at a selected MRI frequency or range frequencies includes a capacitor having a capacitance of between 100 and 10,000 picofarads, and a temperature stable dielectric having a dielectric constant of 200 or less and a temperature coefficient of capacitance (TCC) within the range of plus 400 to minus 7112 parts per million per degree centigrade. The capacitor's dielectric loss tangent in ohms is less than five percent of the capacitor's equivalent series resistance (ESR) at the selected MRI RF frequency or range of frequencies.
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