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Infusion and blood chemistry monitoring system

  • US 4,573,968 A
  • Filed: 08/16/1983
  • Issued: 03/04/1986
  • Est. Priority Date: 08/16/1983
  • Status: Expired due to Term
First Claim
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1. A system for infusing fluid into a patient and for monitoring patient blood chemistry, comprising:

  • an infusion line;

    a catheter at one end of said infusion line and adapted for insertion into the patient;

    a reversible infusion pump operable for pumping an infusion fluid through said infusion line and said catheter in a first direction for infusion into the patient;

    a blood chemistry sensor mounted in flow communication with said infusion line near said catheter for providing an indication of patient blood chemistry upon contact with a patient blood sample; and

    control means for controllably interrupting operation of said infusion pump in said first direction to interrupt supply of infusion fluid into the patient for a selected time interval;

    said control means further including means for operating said infusing pump for pumping infusion fluid through said infusion line in a second direction for drawing a patient blood sample through said catheter into contact with said sensor and then to resume operation in said first direction for reinforcing the drawn blood sample through said catheter into the patient followed by resumed infusion of said infusion fluid.

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