A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
354/22, 326/13.5
A61B 5/02 (2006.01) A61B 5/029 (2006.01) A61B 5/103 (2006.01) G01F 17/00 (2006.01)
Patent
CA 1261066
METHOD AND APPARATUS FOR MEASURING VENTRICULAR VOLUME ABSTRACT OF THE DISCLOSURE A method and apparatus for the instantaneous measurement of ventricular volume using an intracavity electrical impedance catheter having plural pairs of spaced surface electrodes driven by a corresponding plurality of electrical signals, each of the signals exhibiting a different discrete frequency, and having plural pairs of spaced surface electrodes for sensing the potentials at predetermined locations within the ventricle. Switching means are provided for selectively coupling the drive signals to predetermined pairs of surface electrodes and for selecting the sensing electrode pairs to be utilized at any given time for read-back of the sensed potentials. The read-back signals are demodulated and converted from an analog signal to a digital quantity. Then, a digital computer is used to determine from the sensed digital quantities the extrapolated value of impedance corresponding to sources spaced an infinite distance apart. Knowing the extrapolated impedance value, the volume of blood in the ventricle can be computed using the formula V = ? L2/R0 wherein R0 is the extrapolated impedance value, 1 is the distance between the spaced sensing electrodes spanning the ventricle and ? is the resistivity of the blood.
517432
Cardiac Pacemakers Inc.
Frayne & Company Robert
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