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

• Current Assignee: Nissho Corporation (Nitto Denko Corporation), Toru Shinzato
• Original Assignee: Nissho Corporation (Nitto Denko Corporation), Toru Shinzato
• Inventors: Shinzato, Toru
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): Nasser, Robert L.
• Application Number:
  US08/147,445
• Time in Patent Office: 396 Days
• Field of Search: 128/673, 604/4-6, 604/29-31, 604/64-66
• US Class Current: 600/486
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: A61M 1/3639 Blood pressure control, pressure transducers specially adapted therefor
• CPC Class Codes: A61M 1/3653 Interfaces between patient blood circulation and extra-corporal blood circuit
• CPC Class Codes: A61M 2025/0003 having an additional lumen transmitting fluid pressure to the outside for measurement
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/3351 Controlling upstream pump pressure
• CPC Class Codes: A61M 2230/30 Blood pressure A61M2230/04 takes precedence

Abstract

A blood clarification device wherein a means for measuring blood pressure comprises (a) a needle-detector which is much thinner than the puncture needle and capable of being smoothly inserted into a blood vessel from outside through an inner aperture of the puncture needle, (b) an insertion aperture, for allowing fluid-tight insertion of the needle-detector, positioned on a wall of the blood supply passage in the vicinity of the puncture needle, and (c) a pressure transducer for detecting the blood pressure inside the blood vessel transmitted thereto via the needle-detector. In a blood clarification apparatus of the present invention, blood pressure inside a blood vessel is transmitted to a pressure transducer via a needle-detector during dialysis/filtration operation and blood pressure of a patient is detected continuously and automatically by the pressure transducer. A counterplan such as control of water-removing-rate or supplying-supplementary-fluid-rate based on the detected blood pressure is automatically carried out, so that safety of dialysis/filtration operation can be effectively improved.

Claims

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, and

a 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.