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Microprocessor controlled intravenous feed system

  • US 4,457,750 A
  • Filed: 11/02/1981
  • Issued: 07/03/1984
  • Est. Priority Date: 11/02/1981
  • Status: Expired due to Fees
First Claim
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1. An intravenous feed system, comprising:

  • A. a free hanging container for intravenous fluid, including a gravity feed outlet to a flexible, intravenous tube, and constriction means for the said tube;

    B. sensing means for detecting a weight change in the free hanging container to produce an analogue signal when intravenous fluid is fed therefrom;

    C. means for converting the analogue signal into digital pulses;

    D. clock means for determining Δ

    t;

    E. a plurality of microelectronic circuit registers to receive and output digital pulses, including;

    i. an input register for receiving preset data for dw/dt flow rate and weight settings;

    ii. accumulating registers to store updated container weight and constriction settings; and

    ,iii. output registers for outputting updated constriction settings, flow rate data, fluid weight data and alarm data;

    F. a ROM, including;

    i. a look-up table for determining updated constriction settings;

    ii. a sequencing memory for converting input and instruction information into address words;

    iii. a control sequence memory for generating program steps and jump pulses to control output operations; and

    ,G. an arithmetic unit for;

    i. determining Δ

    w, and dw/dt as measured;

    ii. comparing the measured dw/dt with the preset dw/dt; and

    ,iii. determining the revised constriction settings based on the look-up table.

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