Chronically-implantable active fixation medical electrical leads and related methods for non-fluoroscopic implantation
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United States of America Patent
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Mar 13, 2012
Grant Date -
Jan 7, 2010
app pub date -
Jun 26, 2009
filing date -
Apr 18, 2007
priority date (Note) -
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Abstract
Bio-impedance may be used for navigation systems to chronically implant pacing and defibrillation leads in the heart using a non-fluoroscopic position sensing unit (PSU). Such a system requires that a conductive material, such as a retractable helical tip-electrode, be exposed during implantation. Since the tip is retracted during implantation, this disclosure provides a modified distal portion employing at least one aperture (or “window”) for fluid exposure of the helix-electrode and a deployable internal sleeve for covering the aperture(s) when the helix-electrode is extended.
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