Surgery – Blood drawn and replaced or treated and returned to body
Patent
1981-09-24
1984-08-21
Howell, Kyle L.
Surgery
Blood drawn and replaced or treated and returned to body
128DIG3, 422 44, 422 45, 604 31, 604118, A61M 103
Patent
active
044668040
ABSTRACT:
An extracorporeal blood circulation system including a line for withdrawing the venous blood from the patient, an artificial lung provided on the line, a reservoir for the blood withdrawn, a blood supply line for sending out the blood from the reservoir to the artery of the patient, and a blood supply pump provided on the blood supply line and serving as an artificial heart. The amount of blood to be supplied is automatically controlled to maintain the arterial pressure of the patient in a suitable required range. The blood supply pump is stopped when the arterial pressure of the patient measured is above a predetermined upper limit value, while the pump is driven when the arterial pressure has lowered to a level below a lower limit value. The amount of blood to be withdrawn is also controlled automatically to keep the central venous pressure of the patient approximately constant. The blood withdrawing line has a blood withdrawing pump. The reservoir is connected to the inlet side of this pump by a shunt line having a valve which is usually opened. The valve is closed when the central venous pressure exceeds a predetermined upper limit level. A vertical overflow tube detects the central venous pressure exceeding the upper limit level.
REFERENCES:
patent: 3590809 (1971-07-01), London
patent: 3890969 (1975-06-01), Fischel
patent: 3946731 (1976-03-01), Lichtenstein
patent: 4175264 (1979-11-01), Schiff
patent: 4231354 (1980-11-01), Kurtz et al.
Peter J. Martin, "New Controller for In-Series Cardiac-Assist Devices", pp. 243-249.
Howell Kyle L.
Yanulis George
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