Patent ID: 7524417
Filing Date: 2009-04-28
Classification: A61M,B01D

Abstract:
1. A dialyzer comprising a substantially cylindrical case having a length M, a hollow fiber bundle made of a plurality of hollow fiber membranes provided in the case, a gap formed between an inner wall of the case and the hollow fiber bundle, a blood flow path formed by lumens of the hollow fiber membranes, a blood inlet to and a blood outlet from the blood flow path, a dialysate flow path formed by the gap between the inner wall of the case and the hollow fiber membranes and gaps between the hollow fiber membranes, a dialysate inlet to and a dialysate outlet from the dialysate flow path, and a cylindrical elastic tube having a length L inserted in the gap between the inner wall of the case and the hollow fiber bundle and substantially contacting the inner wall of the case, wherein L is 5% to 90% of M; a lubricant is provided between an outer surface of the elastic tube and the inner wall of the case; a rib is formed on an outer circumferential surface of the elastic tube; a concave portion for receiving the rib and fixing the elastic tube is formed on an inner wall of the case; the rib is fitted into the concave portion so that the elastic tube is securely fixed in the case; and the elastic tube is water-tightly contacted with the inner wall of the case by the elastic force of the tube, thereby securely fixing the elastic tube in the case.