| PATENT CLAIMS |
Selectively permeable hollow fiber membrane for blood dialysis consisting of cellulose deriv., which has a dense layer on the innermost side & porous layer of greater void % on the outside, which has UFR > 50 ml/mmHg.hr.square.m as measured with purified water at 37C which has an overall mass transfer coefficient for dextran of > 0.00002 cm/sec when measured using a 0.1 wt % aq soln of dextran of MW 10,000 & a sieving coefficient of albumin (SCalb) of < 0.1 after one hour perfusion of bovine plasma, when the measurement is made with the hollow fiber membrane incorporated into a dialyzer
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