System and method for detecting occlusions in an infusion pump

  • US 9,962,486 B2
  • Filed: 11/02/2015
  • Issued: 05/08/2018
  • Est. Priority Date: 03/14/2013
  • Status: Active Grant
First Claim
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1. A method of detecting occlusions in an infusion pump comprising a disposable infusion cartridge and a pump device, the infusion cartridge including a collapsible reservoir for containing a fluid and a substantially rigid shell disposed over the collapsible reservoir and forming an interior volume between an outside surface of the collapsible reservoir and an inside surface of the shell, the infusion cartridge further including a delivery mechanism having a spool slidingly disposed in a bore, the spool including a main section and a distal section axially displaceable relative to the main section with a collapsible volume formed between a seal on the main section and a seal on the distal section, the pump device configured to selectively receive the infusion cartridge and cooperate with the infusion cartridge to deliver fluid from the reservoir into the collapsible volume and to a patient, the pump device including a drive mechanism powered by a motor and selectively engageable with the spool to impart controlled axial movements to the spool to deliver fluid to the patient, wherein the method comprises:

  • actuating an operation to deliver fluid stored in the collapsible volume to a patient;

    determining whether the distal section of the spool moved axially at a time during the operation configured to deliver fluid from the collapsible volume to the patient when the distal section should have remained stationary; and

    selectively generating an occlusion alarm if it is determined that the distal section of the spool moved at the time it should have remained stationary.

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