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Programmable infusion pump for administering medication to patients

  • US 5,389,078 A
  • Filed: 10/06/1993
  • Issued: 02/14/1995
  • Est. Priority Date: 10/06/1993
  • Status: Expired due to Fees
First Claim
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1. A programmable infusion pump for administering fluid to a patient at multiple programmable rates and for calculating an effective rate on a real-time basis, the pump having a motor with a stroke volume corresponding to a discrete volume of fluid for each pump activation for delivering a volume of fluid during an infusion cycle, comprising:

  • input means for receiving, (i) a basal infusion rate corresponding to a time interval between basal pump activations, (ii) an automatic dose having a start time, an automatic dose volume, and a duration, and (iii) a demand dose having a start time, a demand dose volume and a duration;

    means for identifying the start time of an automatic dose, including means for calculating a rate for the automatic dose;

    means for detecting the start time of a patient activated demand dose, including means for calculating a rate for the demand dose;

    means for calculating the effective rate corresponding to a time interval between pump activations, comprising the sum of the basal rate and any automatic and demand dose rates, the means for calculating including means for identifying a start time for the effective rate;

    means for determining any undelivered volume of fluid which is scheduled for delivery prior to the start time of the effective rate, including means for delivering the portion of the undelivered volume of fluid corresponding to a whole number of stroke volumes;

    means for determining any portion of the undelivered volume of fluid which is a fraction of the stroke volume of the motor;

    means for altering at least one of the time intervals subsequent to the new effective rate to include the fractional portion of the undelivered volume; and

    pump means for administering the fluid to the patient according to the effective rate.

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