Surgery – Blood drawn and replaced or treated and returned to body – Constituent removed from blood and remainder returned to body
Patent
1982-09-24
1984-12-04
Coven, Edward M.
Surgery
Blood drawn and replaced or treated and returned to body
Constituent removed from blood and remainder returned to body
128DIG3, A61M 103
Patent
active
044861893
ABSTRACT:
A hemodialysis system capable of operation in either a single needle mode or a double needle mode includes an arterial blood pump which is the sole blood pump in the system during the double needle mode. For single needle mode operation a venous blood pump is employed to return blood to the patient. A pump speed control adjusts the speed of the arterial pump in the double needle mode, and the speeds of both blood pumps in the single needle mode. A controller continuously operates the arterial pump in the double needle mode, and alternately activates the two pumps in the single needle mode. A module for modifying a commercially available double needle system for operation in either of the two modes is also described.
REFERENCES:
patent: 3756234 (1973-09-01), Kopp
patent: 3830234 (1974-08-01), Kopp
patent: 3848592 (1974-11-01), Willock
patent: 3982535 (1976-09-01), Bahrton
patent: 3985134 (1976-10-01), Lissot et al.
patent: 4048064 (1977-09-01), Clark
patent: 4231366 (1980-11-01), Schael
"New System for Single-Needle Dialysis", British Medical Journal, vol. 281, p. 1109 (Oct. 25, 1980).
Morrow Richard A.
Troutner Vernon H.
Coven Edward M.
Extracorporeal Medical Specialties Inc.
Hofer Mark A.
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