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Transfusion device

  • US 5,505,696 A
  • Filed: 12/13/1993
  • Issued: 04/09/1996
  • Est. Priority Date: 12/14/1992
  • Status: Expired due to Term
First Claim
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1. A transfusion device in which a transfusion tube is squeezed by a transfusion pump mechanism so as to feed transfusion solution in the transfusion tube through pressurization, comprising:

  • first means operatively connected to the transfusion device for setting sizes of air bubbles to be detected in the transfusion solution, the first means including a bubble sensor formed by an ultrasonic transmitter and an ultrasonic receiver;

    the ultrasonic transmitter and the ultrasonic receiver being located on an outer periphery of the transfusion tube so as to be opposed to each other through the transfusion tube;

    said first means also for setting a transfusion rate and a transfusion quantity of the transfusion solution;

    a second means responsive to said first means for calculating a pressurization feed rate of the transfusion solution on the basis of the transfusion rate and a cross-sectional area of the transfusion tube;

    third means responsive to said first and second means for calculating a permissible quantity of the air bubbles mixed into a unit volume of the transfusion solution on the basis of the size of the air bubbles and the transfusion rate;

    fourth means responsive to said third means for calculating an integrated value of the air bubbles per unit volume of the transfusion solution on the basis of the pressurization feed rate of the transfusion solution and output level of the bubble sensor;

    fifth means responsive to said fourth means for judging whether or not the integrated value of the air bubbles per unit volume of the transfusion solution exceeds the permissible quantity of the air bubbles mixed into the unit volume of the transfusion solution; and

    sixth means responsive to said fifth means for stopping, when the fifth means has judged that the integrated value of the air bubbles per unit volume of the transfusion solution exceeds the permissible quantity of the air bubbles mixed into the unit volume of the transfusion solution, the transfusion pump mechanism.

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