Impedance plethysmograph

Details Impedance plethysmograph Impedance plethysmograph

1975-06-23

1979-09-25

Howell, Kyle L.

Surgery

Truss

Pad

128734, A61B 502

Patent

active

RE0301019

ABSTRACT:
Cardiac output is measured by connecting excitation electrodes at the upper and lower ends of the thorax of a mammalian subject, connecting measuring electrodes to the thorax between the excitation electrodes, applying a constant fluctuating excitation current to the excitation electrodes, measuring, with appropriate circuitry, changes in impedance within the thorax, and simultaneously measuring the beginning and end of systole, and determining cardiac output by measuring the maximum decreasing impedance slope during systole.

REFERENCES:
patent: 2184511 (1939-12-01), Bagno et al.
patent: 3095872 (1963-07-01), Tolles
patent: 3144019 (1964-08-01), Haber
patent: 3149627 (1964-09-01), Bagno
patent: 3224435 (1965-12-01), Traite
patent: 3267933 (1966-08-01), Mills et al.
patent: 3267934 (1966-08-01), Thornton
patent: 3280817 (1966-10-01), Jorgenson et al.
Zajic; F., et al., Physiologia Bohemoslovenica, vol. III, 1954, pp. 355-361.
Nyboer; J., Electrical Impedance Plethysmography, 1954, Charles C. Thomas, Spfld. Ill., Publisher, pp. 50-57.
Bishop; S. et al., Harper Hospital Bulletin, Jul.-Aug. 1962, pp. 142-143.

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