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US Patent Application 20100222856 - Band stop filter employing a capacitor and an inductor tank circuit to enhance MRI compatibility of active medical devices

Application 20100222856 Filed on May 10, 2010. Published on September 2, 2010

Inventors

Assignee

US Class

607/116Placed in body

Attorney, Agent or Firm

International Class

A61N 1/05


Abstract text


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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