Surgery – Diagnostic testing – Cardiovascular
Patent
1997-08-27
1999-10-26
Kamm, William E.
Surgery
Diagnostic testing
Cardiovascular
A61B 5029
Patent
active
059719338
ABSTRACT:
A method of determining cardiac volume including the steps of positioning a catheter in a blood-filled chamber of a patient's heart. The catheter comprises an elongated body having a distal end, a proximal end, a plurality of spaced electrodes arrayed on the outer surface of the catheter and spaced apart a predetermined distance from each other to define a distal electrode, a proximal electrode and a plurality of pairs of adjacent electrodes between the distal and proximal electrodes to define volume segments within the chamber. The method includes the steps of providing a constant alternating current to the distal and proximal electrodes, measuring the potential between pairs of electrodes located between a distal and proximal electrodes while the distal and proximal electrodes are energized with the constant amplitude alternating current; determining a set of correction factors from the measured raw segmental volumes and catheter curvature; and correcting for field non-uniformity by multiplying the raw volumes by the set of correction factors.
REFERENCES:
patent: 4674518 (1987-06-01), Salo
patent: 4840182 (1989-06-01), Carlson
patent: 4951682 (1990-08-01), Petre
Gopakumaran Balakrishnan
Osborn Peter K.
Petre John H.
Schluter Paul
Cleveland Clinic Foundation
Evanison George R.
Kamm William E.
Marquette Medical Systems
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