Surgery – Truss – Pad
Patent
1988-04-04
1989-06-20
Howell, Kyle L.
Surgery
Truss
Pad
128692, 128734, A61B 502
Patent
active
048401820
ABSTRACT:
Conductance catheter apparatus for measuring the volume of a biological chamber, the apparatus including a catheter employing a plurality of electrodes along its length, the plurality including outer transmitting electrodes and intermediate potential sensing electrodes between the outer electrodes, an alternating current source connected to provide alternating currents at high and low frequencies to the outer transmitting electrodes, processing circuitry connected to the intermediate potential sensing electrodes for processing potential signals to obtain conductance signals indicating high frequency and low frequency conductance and for using the conductance signals to determine volume in a manner that excludes parallel conductance through the wall of the chamber and surrounding tissue.
REFERENCES:
patent: 3882851 (1975-05-01), Sigworth
patent: 4380237 (1983-04-01), Newbower
patent: 4641658 (1987-02-01), Lepper
patent: 4674518 (1987-06-01), Salo
Baan, J., et al., "Continuous Stroke Volume and Cardiac Output from Intra-Ventricular Dimensions Obtained with Impedance Catheter", Cardiovasc. Res. 15: 328-334 (1981).
Baan, J., et al., "Continuous Measurement of Left Ventricular Volume in Animals and Humans by Conductance Catheter", Circulation 70: 812-823 (1984).
Burkhoff, D., et al., "Accuracy of Volume Measurement by Conductance Catheter in Isolated, Ejecting Canine Hearts", Circulation 72: 440-447 (1985).
Carlson, Drew E., et al., "Right Atrial Volume During Hemorrhage in the Dog", Am. J. Physiol. H1136-1144 (1986).
McKay, Raymond G., et al., "Instantaneous Measurement of Left and Right Ventricular Stroke Volume and Pressure-Volume Relationships with an Impedance Catheter", Circulation 69: 703-710 (1984).
Howell Kyle L.
Rhode Island Hospital
Sykes Angela D.
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