Patent ID: 7087168
Filing Date: 2006-08-08
Classification: A61M,B01D,D01F

Abstract:
1. A hollow fiber blood purification membrane, which is a dry membrane containing no membrane pore holding agent: wherein the dry membrane is prepared by: (a) has a sponge-like structure with the pore size continuously decreasing from the outer surface of the membrane toward the compact layer of the inner surface, (b) has pure water permeability of 10–1,000 mL/(m (c) has permeability of polyvinyl pyrrolidone with a weight average molecular weight of 40,000 of more than 75%, (d) has permeability of albumin in bovine blood plasma of less than 0.3%, (e) has an absorbance in a membrane elution test solution of less than 0.04, with no membrane pore holding agent contained in the elution test solution, and (f) comprises a polysulfone-based polymer and polyvinyl pyrrolidone, with a polyvinyl pyrrolidone content of 30–45 wt % on the inner surface of the membrane.