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Artificial kidney device

  • US 3,986,956 A
  • Filed: 12/04/1974
  • Issued: 10/19/1976
  • Est. Priority Date: 12/04/1973
  • Status: Expired due to Term
First Claim
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1. An artificial kidney device for a human being comprising:

  • a dialyzer for removing specified components from blood;

    blood pumping means for transporting blood from an artery of the human being to the dialyzer and creating a blood pressure in the dialyzer above arterial pressure;

    means forming a flow passage in communication with said dialyzer for transporting blood passed through the dialyzer to a vein of the human being;

    means for maintaining a substantially constant ultrafiltration pressure in said dialyzer including an inner tube forming part of said flow passage and an outer tube surrounding said inner tube and defining a closed chamber therewith, the pressure within said inner tube being subject to change in accordance with prevailing blood pressure in said dialyzer; and

    means for applying and maintaining a substantially constant predetermined pressure in excess of atmospheric pressure within said closed chamber;

    said inner tube being formed of material deformable in response to changes in pressure within said inner tube and the pressure differentials created thereby between the inside of said inner tube and said chamber to enlarge or restrict said flow passage through said inner tube so that the pressure inside said inner tube will balance the substantially constant predetermined pressure in said closed chamber to thereby maintain said ultrafiltration pressure in the dialyzer substantially constant.

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