| abstract |
A leukocyte-removing filter material which consists of a porous element having fine pores of an average pore diameter of not less than 1.0 µm but less than 100 µm and a fiber structure composed of a plurality of fibers having an average fiber diameter of not less than 0.01 µm but less than 1.0 µm kept on the above porous element, wherein the porosity of the above filter material is not less than 50% but less than 95%, the proportion of the above fiber structure to the above filter material is not less than 0.01% by weight but less than 30% by weight, the ratio between the average pore diameter of the above porous element and the average fiber diameter of the above fiber structure is not less than 2 but less than 2,000 and the above fiber structure forms a reticulate structure; a process for producing the same; and an apparatus for removing leukocyte using the above filter material. |