Patent ID: 9114217
Filing Date: 2015-08-25
Classification: A61M

Abstract:
1. An infusion system comprising: a pump; a fluid delivery line connected to the pump for delivering fluid; at least one sensor connected to the fluid delivery line for emitting and receiving signals to detect whether there is air in the fluid delivery line; a processor in electronic communication with the pump and the at least one sensor; and a memory in electronic communication with the processor, wherein the memory comprises programming code for execution by the processor, and the programming code is configured to analyze the signals to determine if a stuck fluid droplet is stuck within the fluid delivery line at a location of the at least one sensor; wherein the programming code is configured to determine if the stuck fluid droplet is stuck within the fluid delivery line at the location of the at least one sensor by determining a pattern relationship over time between a plurality of digital measurements of the signals; wherein the programming code is configured to determine that the stuck fluid droplet is present if the determined pattern relationship starts at or below a known liquid signal ADC value at a first period in time, increases from at or below the known liquid signal ADC value to over a primary threshold ADC value at a second period in time, decreases from over the primary threshold ADC value to between the primary threshold ADC value and a secondary threshold ADC value at a third period in time, and passes a stability test while being disposed at a fourth period in time between the primary threshold ADC value and the secondary threshold ADC value.