The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 26, 1999
Filed:
Aug. 27, 1997
Balakrishnan Gopakumaran, Shaker Heights, OH (US);
John H Petre, Cleveland Heights, OH (US);
Peter K Osborn, West Allis, WI (US);
Paul Schluter, Whitefish Bay, WI (US);
Cleveland Clinic Foundation, Cleveland, OH (US);
Marquette Medical Systems, Milwaukee, WI (US);
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.