Surgery – Diagnostic testing – Measuring electrical impedance or conductance of body portion
Reexamination Certificate
2006-12-12
2006-12-12
Hindenburg, Max (Department: 3736)
Surgery
Diagnostic testing
Measuring electrical impedance or conductance of body portion
C600S301000, C600S512000
Reexamination Certificate
active
07149573
ABSTRACT:
A patient monitoring system including an implantable medical device for monitoring a plurality of physiological factors contributing to physiological conditions of a patient's heart by measuring a first impedance affected by the plurality of physiological factors, across one of a plurality of vectors, and a second impedance affected by the plurality of physiological factors, across a second one of the plurality of vectors subsequent to determining the first impedance. A change in impedance is determined based upon the first impedance and the second impedance measurements. Using an equation ΔZVX=αAVX*QA+αBVX*QB, where QAis a fractional resistivity change of a first contributing physiological impedance factor, QBis a fractional resistivity change of a second physiological impedance factor, αAVXis an impedance sensitivity factor for physiological impedance factor QA, and αBVXis an impedance sensitivity factor for physiological impedance factor QB, the value of one of the contributing physiological impedance factors is determined. The contributing physiological impedance factors may include lung resistivity, blood resistivity, heart muscle resistivity, skeletal muscle resistivity, heart volume and lung volume.
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Hindenburg Max
Medtronic Inc.
Soldner Michael C.
Towa Rene
Wolde-Michael Girma
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