Patent ID: 8469942
Filing Date: 2013-06-25
Classification: A61M,G01F,G01L

Abstract:
1. In a fluid infusion device comprising a drive motor assembly and a force sensor associated with the drive motor assembly, a method of detecting occlusions in a fluid path of the fluid infusion device, the method comprising: determining a plurality of force measurements for a fluid delivery action of the drive motor assembly, the plurality of force measurements indicating measures of actuation force imparted to the force sensor for the fluid delivery action; determining a plurality of quantity measurements for the fluid delivery action, each of the plurality of quantity measurements being determined relative to a reference quantity measurement; indicating an occlusion when a first slope of force-versus-quantity for a large sample of the plurality of quantity measurements is greater than or equal to a first threshold slope value; and indicating an occlusion when both: (a) a second slope of force-versus-quantity for a small sample of the plurality of quantity measurements is greater than or equal to a second threshold slope value; and (b) a current one of the plurality of force measurements is greater than or equal to a threshold force value, wherein: each of the plurality of quantity measurements indicates a volume of fluid dispensed from a fluid reservoir of the fluid infusion device; the large sample corresponds to a predefined large volume reference; and the small sample corresponds to a predefined small volume reference.