Method and apparatus for measuring cardiac output

Details Method and apparatus for measuring cardiac output Method and apparatus for measuring cardiac output

1982-04-21

1986-02-25

Cohen, Lee S.

Surgery

Truss

Pad

128713, A61B 502

Patent

active

045722064

ABSTRACT:
Cardiac output is measured utilizing an indicator, such as saline, which alters blood resistivity, and an electrically calibrated conductivity cell positioned at the tip of a catheter. The catheter with the tetrapolar conductivity cell at the tip is inserted into a blood vessel for current injection to develop a potential which is proportional to blood resistivity for inscribing the dilution curve occurring due to injection of the indicator, which curve is utilized to determine blood flow or cardiac output.

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patent: 3930493 (1976-01-01), Williamson
patent: 3985123 (1976-10-01), Herzlinger et al.
patent: 4015593 (1977-04-01), Elings et al.
patent: 4175566 (1979-11-01), Millar
patent: 4380237 (1983-04-01), Newbower
Stewart; "Researches on the Circulation and on the Influences Which Affect It"; Journ. of Physiology; 22: 159-83; 1897.
Stewart; "The Output of the Heart in Dogs"; Amer. Journ. of Physiology; 57: 27-50; 1921.
Geddes et al.; "Cardiac Output Using an Electrically Calibrated Flow Through Conductivity Cell"; Journ. of Applied Physiology; 37: 972-7; 1974.
Geddes et al.; "Elect. Calibration of the Saline Conductivity Method for Cardiac Output: Prelim. Report"; Cardiovascular Research Center Bulletin; 10: 91-106; 1972.
Smith et al.; "Cardiac Output Determined by the Saline Conductivity Method Using an Extra-Arterial Conductivity Cell"; Cardiovascular Research Center Bulletin; 5: 123-35; 1967.
Geddes et al.; "Princ. of Applied Biomedical Instrumentation"; 1975, pp. 330-342.
Smith et al.; "Elect. Calibration for the Saline Dilution Method for Cardiac Output"; Cardiovascular Research Center Bulletin; 6: 142-56; 1968.

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