Band stop filter employing a capacitor and an inductor tank circuit to enhance MRI compatibility of active medical devices
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United States of America Patent
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Sep 1, 2015
Grant Date -
Nov 1, 2012
app pub date -
Jul 9, 2012
filing date -
Jun 8, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A band stop filter is provided for a lead wire of an active medical device (AMD). The band stop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the band stop filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the band stop filter is integrated into a TIP and/or RING electrode for an active implantable medical device.
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