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Dialyzer and method for manufacturing the same

  • US 7,524,417 B2
  • Filed: 12/24/2003
  • Issued: 04/28/2009
  • Est. Priority Date: 12/26/2002
  • Status: Active Grant
First Claim
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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.

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