The present invention provides a kind of blood treatment Porous hollow cortina, though for through filming Ju Sulfone system hollow fiber membrane, in what production stage or transmission process or using when be not likely to produce mechanical damage, and fractionation property is excellent. A kind of blood treatment of what Porous hollow cortina is closed in system of the present invention, it contains Ju Sulfone based polymer and polyvinyl pyrrolidone, and formed hole without leave film thickness direction inside towards outside increase gradient porous structure, its characteristic is in what: the film thickness of the porous structure is 25 μm or more, not up to 40 μm, and the porous structure system by ensemble average fineness degree for 100 ~ 200 nm fibrinogen configure in a manner of the ratio (To/Ti) of the outside average thickness (To) of film thickness direction and inside average thickness (Ti) reaches 2 or less.本發明提供一種血液處理用多孔中空絲膜，其雖為經薄膜化之聚碸系中空絲膜，但於生產步驟或輸送過程中或者使用時不易產生機械損傷，並且分餾性優異。本發明係關於一種血液處理用多孔中空絲膜，其含有聚碸系聚合物及聚乙烯吡咯啶酮，且形成孔徑自膜厚方向之內側朝向外側增大之梯度多孔結構，其特徵在於：該多孔結構之膜厚為25 μm以上、未達40 μm，且該多孔結構係將整體平均粗細度為100~200 nm之原纖維以膜厚方向之外側平均粗細度(To)與內側平均粗細度(Ti)之比值(To/Ti)達到2以下之方式進行配置而成。
