Surgery – Truss – Perineal
Patent
1975-07-09
1976-10-26
Howell, Kyle L.
Surgery
Truss
Perineal
73204, A61B 502
Patent
active
039877884
ABSTRACT:
A thermistor is used to sense the temperature of blood at a location downstream of a point at which a small quantity of liquid (indicator) having a temperature lower than the blood is introduced. Circuitry is used to compute the flow measurement from the sensed blood temperature according to the Stewart-Hamilton dilution equation for a thermal indicator. Values are manually entered into the system for a computation constant, the temperature of the body and the temperature of the indicator. The thermodilution curve sensed by the thermistor is integrated through the peak value to a predetermined per cent of the peak value and increased by a predetermined per cent to generate an estimated integral value. The flow value is computed in a dual slope ratiometric analog-to-digital converter by taking the ratio of the product of the temperature difference times the computation constant to the estimated integral value.
REFERENCES:
patent: 3269386 (1966-08-01), Sherman
patent: 3651318 (1972-03-01), Czekajewski
patent: 3678922 (1972-07-01), Philips et al.
Journ. of Assoc. for Advancement of Medical Instr., vol. 6, No. 2, Mar.-Apr. 1972, pp. 116-121.
American Hospital Supply Corporation
Howell Kyle L.
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