The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 01, 2011
Filed:
Jul. 26, 2006
Karl Gauglitz, Snohomish, WA (US);
Thomas M. Bocek, Seattle, WA (US);
Mark Rutzer, Seattle, WA (US);
Lorin W. Matthews, Brier, WA (US);
William E. Reagor, Bellevue, WA (US);
Blair Erbstoeszer, Kirkland, WA (US);
Karl Gauglitz, Snohomish, WA (US);
Thomas M. Bocek, Seattle, WA (US);
Mark Rutzer, Seattle, WA (US);
Lorin W. Matthews, Brier, WA (US);
William E. Reagor, Bellevue, WA (US);
Blair Erbstoeszer, Kirkland, WA (US);
Cardiac Pacemakers, Inc., St. Paul, MN (US);
Abstract
Systems and methods for sensing external magnetic fields in implantable medical devices are provided. One aspect of this disclosure relates to an apparatus for sensing magnetic fields. An apparatus embodiment includes a sensing circuit with at least one inductor having a magnetic core that saturates in the presence of a magnetic field having a prescribed flux density. The apparatus embodiment also includes an impedance measuring circuit connected to the sensing circuit. The impedance measuring circuit is adapted to measure impedance of the sensing circuit and to provide a signal when the impedance changes by a prescribed amount. According to an embodiment, the sensing circuit includes a resistor-inductor-capacitor (RLC) circuit. The impedance measuring circuit includes a transthoracic impedance measurement module (TIMM), according to an embodiment. Other aspects and embodiments are provided herein.