Patent ID: 8828225

Claim:
A polysulfone hemodialyzer comprising a tubular housing having a body portion and head portions and providing a dialysate inlet port in one of the head portions and a dialysate outlet port in the other head portion, a hollow fiber membrane bundle which is formed from a polysulfone polymer and polyvinylpyrrolidone and filled in the tubular housing, a resin layer portion provided on an end of the head portion of the housing, securing the bundle in the housing and forming an open end for the hollow fiber membranes, and a header portion which has a blood circulation port and with which the resin layer portion is capped, wherein the hemodialyzer has a membrane area of more than 2.4 m 2 and 3.2 m 2 or less, and the bundle includes a straight portion and a dialysate rectifying portion, a ratio of a dialysate channel area in a diameter-expansion-start portion to a dialysate channel area inside the resin layer portion is 0.2 to 0.5, and the dialysate rectifying portion having a distance from the diameter-expansion-start portion to the inside of the resin layer portion of 10 to 46 mm is provided in a dialysate inlet port side end portion of the bundle, wherein a filling rate of the bundle with respect to the minimum diameter of the body portion of the housing is 55% or more and less than 69%.