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Automated drug additive infusion system

  • US 4,710,166 A
  • Filed: 11/08/1985
  • Issued: 12/01/1987
  • Est. Priority Date: 11/08/1985
  • Status: Expired due to Term
First Claim
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1. A system for administering to a patient fluid from a secondary fluid container at a selected secondary flow rate, followed by fluid from a primary fluid container at a selected primary flow rate, in which the rates are governed at a rate control site by an electromechanical device, the system comprising:

  • a Y-connector upstream from the rate control site;

    a primary fluid tube extending from the primary fluid container to the Y-connector through a primary valve;

    a secondary fluid tube extending from the secondary fluid container to the Y-connector through a secondary valve;

    an output flow tube extending from the Y-connector toward the patient whereby a primary fluid path is provided from the primary container to the device through the primary fluid tube, Y-connector and output flow tube, and a secondary fluid path is provided from the secondary container to the device through the secondary fluid tube, Y-connector and output flow tube;

    detection means for automatically detecting the absence of fluid at a location in the secondary fluid path near the Y-connector, said location being selected so that no fluid holding means other than tubing is interposed in the secondary fluid path below the detection means and above the Y-connector; and

    switching means responsive to detection by the detection means to close the secondary valve and open the primary valve, and thereafter cause the device to govern flow at the rate selected for the primary fluid.

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