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Blood clarification apparatus

  • US 5,370,123 A
  • Filed: 11/05/1993
  • Issued: 12/06/1994
  • Est. Priority Date: 02/04/1991
  • Status: Expired due to Term
First Claim
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1. A blood clarification apparatus, comprising:

  • means for taking blood out of a blood vessel of a patient, said means for taking blood including a puncture needle and a blood supply passage through which said blood flows;

    dialyzing and/or filtering means for receiving and clarifying said blood from said means for taking blood;

    blood carry passage means, operably coupled to said dialyzing and/or filtering means, for carrying blood back from said dialyzing and/or filtering means to said patient;

    dialyzate supply and removal control means, operably coupled to said dialyzing and/or filtering means, for controlling an introduction or removal of dialyzate and a flow rate and pressure thereof to or from said blood in said dialyzing and filtering means, said dialyzate supply and removal control means also controlling water removal by said dialyzing and/or filtering means;

    water-removal/supplementary-fluid-supply control means, operably coupled to said dialyzing and/or filtering means and to said dialyzate supply and removal control means, for controlling;

    (a) said dialyzate supply and removal control means, and (b) supply of supplementary fluid to said dialyzing and/or filtering means; and

    a blood pressure measuring means, operably coupled to said water-removal/supplementary-fluid-supply control means, for continuously measuring blood pressure of said patient, water removal rate and/or supplementary fluid supply rate being controlled based on readings of said blood pressure measuring means,wherein said blood pressure measuring means comprises;

    a pressure transducer, anda needle-shaped pipe for detecting a blood pressure, having a tip end portion which is placed to sufficiently project from a tip end portion of the puncture needle and is sticked into the blood vessel in an inverse direction relative to a blood current, from outside of the patient through an inner aperture of said puncture needle and is kept sufficiently deep inside the blood vessel, said needle-shaped pipe further having an inner aperture which is filled with a liquid solution so as to prevent blood from entering therein by which a blood pressure inside the blood vessel is transmitted to said liquid solution and further transmitted to said pressure transducer,said pressure transducer, operably coupled to said needle-shaped pipe for detecting a blood pressure, for continuously detecting said blood pressure within said blood vessel transmitted thereto through said needle-shaped pipe for detecting a blood pressure.

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