Leukapheretic filter medium

摘要

A leukocyte-removing filter medium which comprises a matrix and ultra-fine fibers having a fiber diameter of less than 1.0 mum and not less than 0.01 mum which contains ultra-fine fibers in an amount of less than 50 wt % and not less than 0.1 wt %, the degree of curvature of the ultra-fine fibers being 1.2 or more, and/or the ultra-fine fibers form pores having a roundness of 1.7 or less.