Blood filter

Details Blood filter Blood filter

B - Operations, Transporting

01

D

182/74

B01D 29/00 (2006.01) A61M 1/36 (2006.01) B01D 35/00 (2006.01) B01D 36/00 (2006.01)

Patent

CA 1117032

ABSTRACT OF THE DISCLOSURE The present invention relates to a filter device for filtering blood. Previously, considerable difficulty had been experienced in filtering blood so as to remove gas and solid microemboli therefrom. Previous filters tend to exhibit substantially decreased flow rates, large pressure drops, and substantial reductions in the effectiveness of the filtration action after the passage of a relatively small amount of blood therethrough. These and other dis- advantages of the prior art have been overcome according to the present invention wherein an effective, high capacity, low prime volume high flow rate blood filter is provided. Filtration is accomplished, according to the present inven- tion in a plurality of filtration stages. The particle sizes of the blood debris are distributed throughout a plurality of size fractions. A filtration stage can be provided for each selected size fraction with the coarsest size fraction generally containing all particles with a principal dimension in excess of approximately 100 microns. At least two other stages are provided in the filter to remove and retain size fractions wherein the particles have a size of less than 90 microns. The filtering elements which are incorporated in blood filter devices according to the present invention incorporate both depth filter elements and screen filter elements.

303463

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