Filter medium having a limited surface negative charge for treat

Details Filter medium having a limited surface negative charge for treat Filter medium having a limited surface negative charge for treat

1993-03-17

1995-04-18

Dawson, Robert A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210767, 21032169, 210508, 210929, 502403, B01D 3700, B01D 3916

Patent

active

054075815

ABSTRACT:
Disclosed is a filter medium for treating a blood material selected from the group consisting of a leukocyte-containing suspension and plasma, comprising a polymeric, porous element having, in a surface portion thereof, a negative charge and having a surface electric charge of not smaller than -30 .mu.eq/g of the polymeric, porous element. The filter medium and an apparatus having the filter medium packed in a casing having an inlet and an outlet, can be advantageously used for treating a blood material, for example, for separating leukocytes from a leukocyte-containing suspension including whole blood, for blood dialysis or for removing undesired proteinous substances and the like from whole blood or plasma by adsorption-filtration, while effectively controlling a concentration of bradykinin (which is causative of anaphylactic reactions) in a treated blood to a level not exceeding 4,000 pg/ml.

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patent: 4880548 (1989-11-01), Pall et al.
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patent: 4936998 (1990-06-01), Nishimura et al.
patent: 5021160 (1991-06-01), Wolpert
patent: 5051185 (1991-09-01), Watanabe et al.
patent: 5286449 (1994-02-01), Kuroda et al.

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