SYSTEMS AND METHODS FOR SENSING EXTERNAL MAGNETIC FIELDS IN IMPLANTABLE MEDICAL DEVICES

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...

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Bibliographische Detailangaben
Hauptverfasser:	GAUGLITZ KARL, REAGOR WILLIAM E, MATTHEWS LORIN W, ERBSTOESZER BLAIR, BOCEK THOMAS M, RUTZER MARK
Format:	Patent
Sprache:	eng
Schlagworte:	DETECTING MASSES OR OBJECTS DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY DIAGNOSIS GEOPHYSICS GRAVITATIONAL MEASUREMENTS HUMAN NECESSITIES HYGIENE IDENTIFICATION MEASURING MEDICAL OR VETERINARY SCIENCE PHYSICS SURGERY TESTING
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Beschreibung
Zusammenfassung:	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.