Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2006-07-26
2011-11-01
Hindenburg, Max (Department: 3736)
Electricity: measuring and testing
Magnetic
Displacement
C324S200000, C324S207130, C324S244000, C340S539120, C340S551000, C600S012000, C600S014000, C600S411000, C600S420000, C600S423000, C607S116000
Reexamination Certificate
active
08049489
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.
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Bocek Thomas M.
Erbstoeszer Blair
Gauglitz Karl
Matthews Lorin W.
Reagor William E.
Cardiac Pacemakers Inc.
Dougherty Sean
Hindenburg Max
Schwegman Lundberg & Woessner, P.A.
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