Surgery – Diagnostic testing – Measuring electrical impedance or conductance of body portion
Reexamination Certificate
2008-09-15
2011-10-04
Hindenburg, Max (Department: 3736)
Surgery
Diagnostic testing
Measuring electrical impedance or conductance of body portion
C600S484000, C600S485000, C600S486000, C600S506000, C600S538000, C607S002000, C607S018000
Reexamination Certificate
active
08032212
ABSTRACT:
Techniques are provided for monitoring thoracic fluid levels based on thoracic impedance (ZT) and cardiogenic impedance (ZC). In one example, the implantable device tracks the maximum time rate of change in cardiogenic impedance (i.e. max(dZC/dt)) to detect trends toward hypervolemic or hypovolemic states within the patient based on changes in heart contractility. The detection of these trends in combination with trends in thoracic impedance allows for a determination of whether the thoracic cavity of the patient is generally “too wet” or “too dry,” and thus allows for the titration of diuretics to avoid such extremes. In particular, a decrease in thoracic impedance (ZT) in combination with a decrease in max (dZC/dt) is indicative of the thorax being “too wet” (i.e. a fluid overload). Conversely, an increase in thoracic impedance (ZT) in combination with a decrease in max (dZC/dt) is indicative of the thorax being “too dry” (i.e. a fluid underload).
REFERENCES:
patent: 5174286 (1992-12-01), Chirife
patent: 6512949 (2003-01-01), Combs et al.
patent: 6512952 (2003-01-01), Stahmann et al.
patent: 6628988 (2003-09-01), Kramer et al.
patent: 6643546 (2003-11-01), Mathis et al.
patent: 7308311 (2007-12-01), Sorensen et al.
patent: 7340296 (2008-03-01), Stahmann et al.
patent: 7422560 (2008-09-01), Hatlestsad et al.
patent: 7630763 (2009-12-01), Kwok et al.
patent: 7676266 (2010-03-01), Kroll
patent: 7899522 (2011-03-01), Koh et al.
patent: 2003/0120164 (2003-06-01), Nielsen et al.
patent: 2004/0102712 (2004-05-01), Belalcazar et al.
patent: 2004/0102721 (2004-05-01), Belalcazar et al.
patent: 2004/0220632 (2004-11-01), Burnes
patent: 2005/0090753 (2005-04-01), Goor et al.
patent: 2005/0109338 (2005-05-01), Stahmann et al.
patent: 2005/0182447 (2005-08-01), Schecter
patent: 2005/0216067 (2005-09-01), Min et al.
patent: 2006/0184060 (2006-08-01), Belalcazar et al.
patent: 2006/0258952 (2006-11-01), Stahmann et al.
patent: 2006/0293609 (2006-12-01), Stahmann et al.
patent: 2007/0088220 (2007-04-01), Stahmann et al.
patent: 2007/0142733 (2007-06-01), Hatlestad et al.
patent: 2007/0239054 (2007-10-01), Giftakis et al.
patent: 2008/0091114 (2008-04-01), Min et al.
patent: 2008/0125826 (2008-05-01), Belalcazar et al.
patent: 2008/0194998 (2008-08-01), Holmstrom et al.
patent: 2008/0215108 (2008-09-01), Zhu et al.
patent: 2008/0243025 (2008-10-01), Holmstrom et al.
patent: 2008/0262361 (2008-10-01), Gutfinger et al.
patent: 2008/0300504 (2008-12-01), Lefkov et al.
patent: 2009/0012416 (2009-01-01), Belalcazar et al.
patent: 2009/0099475 (2009-04-01), Bjorling
patent: 2010/0113961 (2010-05-01), Ohlander et al.
patent: 1011802 (2004-06-01), None
patent: 1582233 (2005-10-01), None
patent: 1582233 (2006-06-01), None
patent: 2004101062 (2004-11-01), None
patent: 2004101062 (2004-11-01), None
patent: 2006068566 (2006-06-01), None
patent: 2007043923 (2007-04-01), None
patent: 2007105996 (2007-09-01), None
patent: 2008103078 (2008-08-01), None
Extended European Search Report, dated Dec. 1, 2009—EP App. No. 09252059.2.
Bornzin Gene A.
Koh Steve
Park Euljoon
Dougherty Sean P
Hindenburg Max
Pacesetter Inc.
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