Apparatus and method for the autotransfusion of blood
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United States of America Patent
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Jun 19, 1990
Grant Date -
N/A
app pub date -
Jun 29, 1988
filing date -
Jun 29, 1988
priority date (Note) -
Expired
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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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