Surgery – Blood drawn and replaced or treated and returned to body
Patent
1982-09-29
1985-01-15
Howell, Kyle L.
Surgery
Blood drawn and replaced or treated and returned to body
604 28, 604 50, 128635, 128DIG3, 422 44, A61M 103
Patent
active
044936923
ABSTRACT:
Novel methods and apparatus are provided for regulating the concentrations of oxygen and carbon dioxide in blood during extracorporeal cardiopulmonary bypass. According to the invention, probes capable of measuring the partial pressures of oxygen and carbon dioxide in blood are provided in the venous and arterial lines, both probes measuring the blood gas levels at the ambient temperature of the blood in the extracorporeal blood circuit. These concentrations are monitored on a real-time basis by a processor unit which compares the values reported by the arterial probe with selected values chosen by the perfusionist. The processor unit then preferably controls the gas flow to the oxygenator portion of the perfusion system so that the treated blood maintains the chosen concentrations of oxygen and carbon dioxide. In other embodiments, the probes are adapted to measure other perfusion variables, including temperature, hematocrit, blood flow rate, and pH, thus allowing further automation by the processor unit.
REFERENCES:
patent: 3482575 (1969-12-01), Claff et al.
patent: 3910256 (1975-10-01), Clark et al.
patent: 4108607 (1978-08-01), Pearson et al.
patent: 4401431 (1983-08-01), Arp
Hanley John C.
Howell Kyle L.
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