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Air detection system and method for detecting air in a pump of an infusion system

  • US 10,578,474 B2
  • Filed: 06/06/2018
  • Issued: 03/03/2020
  • Est. Priority Date: 03/30/2012
  • Status: Active Grant
First Claim
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1. A system for detecting air in a chamber of an infusion system, the infusion system comprising a pump and a plunger moveably disposed against the chamber, the chamber configured to hold fluid, the system comprising:

  • an actuator device configured to move the plunger against the chamber;

    a sensor configured to detect a force acting on the plunger as it moves against the chamber; and

    one or more hardware processors configured to;

    determine a change in force per unit volume of the fluid at a first time during infusion;

    determine the change in force per unit volume satisfies a threshold at the first time;

    determine a difference between a first average force acting on the plunger prior to the first time and a second average force acting on the plunger after a delay time from the first time;

    determine the difference satisfies a force differential; and

    detect a presence of air in the chamber based on the determination of the difference satisfying the force differential and the determination of the change in force satisfying the threshold.

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