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External blood parameter diagnostic system

  • US 4,608,996 A
  • Filed: 08/10/1984
  • Issued: 09/02/1986
  • Est. Priority Date: 08/10/1984
  • Status: Expired due to Term
First Claim
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1. Apparatus for use in externally monitoring parameters of blood and for obtaining blood samples from a single communication access to a patient'"'"'s blood vessel, comprising:

  • a housing having a sample port for fluid communication with blood sampling means, a patient port for fluid communication with a patient'"'"'s blood vessel by way of said single communication access, a parenteral port for fluid communication with a pressurized source of parenteral fluid and a flow through pressure chamber having first and second inlet-outlet passageways permitting fluid flow through said chamber and having a pressure sensor therein positioned relative to said passageways to be responsive to the pressure of fluid flowing through said chamber;

    flow control means for selectively controlling the fluid flow between said ports and said pressure chamber, said control means having a first condition completing a fluid flow path from said parenteral port through said pressure chamber to said patient port while blocking said sample port so that the parenteral fluid will be in fluid communication with the patient'"'"'s blood for monitoring blood pressure transmitted by said parenteral fluid and maintaining patency of said access, a second condition completing a fluid flow path from said parenteral port through said pressure chamber to said sample port while blocking said patient port for flushing the flow path and minimizing production of air bubbles, and a third condition completing a fluid flow path from said patient port to said sample port while blocking said parenteral port for sampling blood.

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