Froth detection system and method
An infusion system includes a pump, a fluid delivery line, at least one sensor, a processor, and a memory. The fluid delivery line is connected to the pump for delivering fluid. The at least one sensor is connected to the fluid delivery line for emitting and receiving signals to detect whether there is air in the fluid delivery line. The processor is in electronic communication with the pump and the at least one sensor. The memory is in electronic communication with the processor. The memory comprises programming code for execution by the processor. The programming code is configured to determine a percentage of the air within an observed volume of the fluid delivery line.
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 determine a partial/percentage volume of the air within an observed volume of the fluid delivery line, by analyzing a plurality of analog-to-digital count readings taken by the at least one sensor to determine in what total number of the plurality of the analog-to-digital count readings a froth exceeded an air-fluid threshold, and by multiplying the total number of the plurality of the analog-to-digital count readings in which the froth exceeded the air-fluid threshold by a calibrated volume per analog-to-digital count reading to determine the partial/percentage volume within the observed volume that the froth exceeded the air-fluid threshold, and is configured to generate an alarm if the partial/percentage volume exceeds an alarm limit.
2. The infusion system of claim 1 wherein the alarm limit comprises a froth threshold.
3. The infusion system of claim 2 wherein the memory comprises a plurality of saved pair settings comprising different froth thresholds for different observed volumes, and the programming code is configured to accept a user input which determines which of the saved pair settings is applied by the programming code.
4. The infusion system of claim 1 wherein the programming code is configured to determine a dynamic froth threshold, and is configured to generate the alarm if the partial/percentage volume exceeds the dynamic froth threshold.
5. The infusion system of claim 1 wherein the observed volume comprises a window of a set volume, wherein the programming code is configured to continually analyze the partial/percentage volume within the observed volume of the fluid delivery line which is disposed within the window at various points in time as the fluid moves through the fluid delivery line.
6. The infusion system of claim 1 wherein the programming code is configured to analyze the plurality of analog-to-digital count readings taken by the at least one sensor to determine what measurement-weighted number, which is weighted by a weighting factor to account for a confidence level that the particular analog-to-digital count reading comprises either the air or the fluid, of the plurality of the analog-to-digital count readings exceed the air-fluid threshold.
7. A method for detecting froth in a fluid delivery line of an infusion system comprising:
pumping fluid through a fluid delivery line over at least one sensor;
emitting and receiving signals from the at least one sensor into and from the fluid delivery line to detect whether there is air in the fluid delivery line;
processing measurements of the signals, using a processor, to determine a partial/percentage volume within an observed volume of the fluid delivery line, to analyze, with the processor, a plurality of analog-to-digital count readings taken by the at least one sensor, to determine, with the processor, in what total number of the plurality of analog-to-digital count readings a froth exceeded an air-fluid threshold, and to multiply, with the processor, the total number of the plurality of the analog-to-digital count readings in which the froth exceeded the air-fluid threshold by a calibrated volume per analog-to-digital count reading to determine the partial/percentage volume within the observed volume that the froth exceeded the air-fluid threshold; and
generating an alarm if the partial/percentage volume exceeds an alarm limit.
8. The method of claim 7 wherein the alarm limit comprises a froth threshold.
9. The method of claim 8 further comprising the processor processing a user input and determining, based on the user input, which of a plurality of saved pair settings, comprising different froth thresholds for different observed volumes, will be used by the processor to determine the partial/percentage volume within the observed volume that the froth exceeded the air-fluid threshold.
10. The method of claim 7 further comprising the processor determining a dynamic froth threshold and triggering the alarm if the partial/percentage volume within the observed volume that the froth exceeded the air-fluid threshold exceeds the dynamic froth threshold.
11. The method of claim 7 further comprising the processor continually analyzing the partial/percentage volume within the observed volume, comprising a window of a set volume, at various points in time as the fluid moves through the fluid delivery line.
12. The method of claim 7 further comprising the processor analyzing the plurality of analog-to-digital count readings taken by the at least one sensor to determine what measurement-weighted number, which is weighted by a weighting factor to account for a confidence level that the particular analog-to-digital count reading comprises either the air or the fluid, of the plurality of the analog-to-digital count readings exceed the air-fluid threshold.