Apparatus and method for the autotransfusion of blood

Details Apparatus and method for the autotransfusion of blood Apparatus and method for the autotransfusion of blood

1988-06-29

1990-06-19

Pellegrino, Stephen C.

Surgery

Blood drawn and replaced or treated and returned to body

604 5, 210645, 210780, 21032168, A61M 134, B01D 1300

Patent

active

049350021

ABSTRACT:
Autotransfusion apparatus and methods are disclosed for collecting, processing and returning blood to a patient during or after surgery. The processing step of the autotransfusion system comprises sequential rough filtering and filtering of the blood. Filtering is achieved within a single filter housing which includes a first ultrafiltration zone where blood fluids and anticoagulant are separated and removed from red blood cells, a washing zone where washing solution is injected into the remaining concentrated red blood cell solution and a second filtration zone where washing solution, residual blood fluids and anticoagulant are separated and removed from the washed and concentrated red blood cell solution. The filtration includes a rotating disc which creates a shear force upon the blood to prevent clotting and red blood cell build up along the face of filter membranes.

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"The Shear Rate Filtration Rate Relationship for Membranes for Plasmaphersis", by E. F. Leonard, Raven Press, New York, 1983.

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