(i9) United States
(12) Patent Application Publication oo) Pub. No.: US 2008/0269591 Al
Halperin et al. (43) Pub. Date: Oct. 30,2008
(54) BAND STOP FILTER EMPLOYING A
CAPACITOR AND AN INDUCTOR TANK
CIRCUIT TO ENHANCE MRI
COMPATIBILITY OF ACTIVE MEDICAL
DEVICES
(75) Inventors: Henry R. Halperin, Pikesville, MD (US); Robert A. Stevenson,
Canyon Country, CA (US)
Correspondence Address:
KELLY LOWRY & KELLEY, LLP
6320 CANOGA AVENUE, SUITE 1650
WOODLAND HILLS, CA 91367 (US)
(73) Assignee: GREATBATCH LTD., Clarence, NY (US)
(21) Appl.No.: 12/170,811
(22) Filed: Jul. 10, 2008
Related U.S. Application Data
(60) Division of application No. 11/423,073, filedon Jun. 8, 2006, which is a continuation-in-part of application No. 10/123,534, filed on Apr. 15, 2002.
(60) Provisional application No. 60/283,725, filed on Apr. 13, 2001.
Publication Classification
(51) Int. CI.
A61B 5/05 (2006.01)
(52) U.S. CI 600/407
(57) 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.
