Cellulose ester hollow fiber membrane for plasma separation

摘要

A hollow fiber membrane made of a cellulose ester having a membrane thickness of not more than 75 mu m, and having void volume (x, % by volume) of the membrane and a rate of ultrafiltration (y, ml/m2.hr.mmHg) satisfying the following formula: 55x-2500/=60, and further has a beta -lipoprotein sieving coefficient (sc) of not less than 0.95, and preferably having further not more than 2% of change ratio in the axial direction and in the radial direction when dipped freely in water at 121 DEG C. for 20 minutes. Said hollow fiber membrane is useful for the medical use, such as the exchange of plasma in patients, collection of plasma from healthy donor, the pre-treatment of plasma for the collection and purification of valuable materials contained in plasma.