Systems and methods for tracking particles in a fluid flow

Patent metadata

Field	Value
Publication number	US-10444141-B2
Application number	US-201514677789-A
Country	US
Kind code	B2
Filing date	Apr 2, 2015
Priority date	Apr 2, 2015
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

A system is described that can detect, track and analyze a bubble of a secondary substance contained within a primary substance along a part of a fluid line. For example, the system can detect the presence of the bubble within the primary substance along the part of the fluid line, which can include assigning a digital signature to the bubble. In addition, the system can track the movement of the bubble in order to ensure that the bubble is accounted for only once as it passes through the part of the fluid line. Furthermore, the system can analyze the bubble, such as determine its direction of travel, speed of travel, volume and size.

First claim

What is claimed is:

1. A system for tracking bubbles in a patient fluid line of an intravenous system that delivers fluid to a patient, comprising:
a light source positioned adjacent the fluid line for directing light to a part of the fluid line, wherein the fluid line is intravenously connected to a patient and contains a primary substance flowing toward and into a patient;
an image capturing device positioned adjacent the fluid line and configured to capture a first image and capture a second image of the part of the fluid line that contains the primary substance flowing toward and into the patient;
a controller configured to adjust a frame rate of the image capturing device based on an actual fluid flow rate of the primary substance in the fluid line; and
a processing system configured to:
process the first image for detecting a secondary substance within the primary substance, wherein the secondary substance is in the form of a bubble;
create a digital signature of the bubble, with the digital signature identifying an outline of the bubble that is used to track and analyze the bubble;
identify a first location of the bubble within the first image;
analyze the second image and identify a second location of the bubble within the second image;
calculate a distance between the first location and the second location and determine if the distance is within a predetermined range, wherein the predetermined range indicates a minimum and maximum distance the bubble is able to travel given the flow rate of fluid within the part of the fluid line;
determine that more than one bubble traveled past the part of the fluid line if the calculated distance is outside of the predetermined range;
determine, along with the digital signature of the bubble, that the same bubble is being tracked if the calculated distance is within the predetermined range

and wherein the controller further adjusts the frame rate such that the bubble does not move farther than a diameter of the bubble from the first image to the second image.

2. The system of claim 1 , wherein the image capturing device is one or more of a digital camera, an infrared camera, and a video camera.

3. The system of claim 1 , wherein the light comprises infrared light.

4. The system of claim 1 , wherein the image capturing device is positioned at an angle from the light source relative to the fluid line.

5. The system of claim 1 , wherein the image capturing device is positioned in line with the light source and system further includes a background positioned on an opposite side of the fluid line from the image capturing device and light source.

6. The system of claim 1 , wherein the processing system is further configured to identify a refraction of the light through at least one of the primary substance and the secondary substance.

7. The system of claim 1 , wherein the processing system is further configured to determine a property of the bubble, wherein the property includes one or more of a speed of travel, a direction of travel, a volume, a size, and a type of substance comprising the bubble.

8. A method of tracking air flow in an intravenous fluid delivery system that delivers fluid to a patient, comprising:
intravenously connecting a fluid line to the patient;
causing a primary substance to flow toward and into a patient through the fluid line;
adjusting, by a controller, a frame rate of an image capturing device based on an actual flow rate of the primary substance in the fluid line as the primary substance flows toward and into the patient;
capturing a first image of a part of the fluid line containing the primary substance with the image capturing device;
determining whether the fluid line contains a secondary substance, with the secondary substance being in the form of a bubble;
creating a digital signature of the bubble, with the digital signature identifying an outline of the bubble that is used to track and analyze the bubble;
identifying, with a processing system, a first location of the bubble within the first image;
capturing a second image of the part of the fluid line with the image capturing device;
further adjusting the frame rate such that the bubble does not move farther than a diameter of the bubble from the first image to the second image;
identifying, with the processing system, a second location of the bubble within the second image;
calculating, with the processing system, a distance between the first location and the second location;
comparing, with the processing system, the calculated distance with a predetermined range, wherein the predetermined range indicates a minimum and maximum distance the bubble is able to travel given the flow rate of fluid within the part of the fluid line;
determining that more than one bubble traveled past the part of the fluid line, if the calculated distance is outside of the predetermined range; and
determining, along with the digital signature of the bubble, that the same bubble is being tracked, if the calculated distance is within the predetermined range.

9. The method of claim 8 , further comprising calculating a distance between the first location and the second location.

10. The method of claim 9 , further comprising comparing the calculated distance with a predetermined range, wherein the predetermined range is dependent on the actual flow rate within the fluid line.

11. The method of claim 10 , further comprising adjusting a frame rate of the image capturing device based on the comparison of the calculated distance with the predetermined range.

12. The method of claim 8 , further comprising analyzing the bubble in at least one of the first image and the second image in order to determine a property of the bubble, wherein the property includes one or more of a speed of travel, a direction of travel, a volume, a size, and a type of substance comprising the bubble.

13. The method of claim 8 , further comprising illuminating a part of a fluid line with light from a light source.

14. The method of claim 13 , wherein the image capturing device is positioned at an angle from the light source relative to the fluid line.

15. The method of claim 13 , wherein the image capturing device is positioned in line with the light source and the bubble tracking system further includes a background positioned on an opposite side of the fluid line from the image capturing device and light source.

16. The system of claim 1 , wherein the controller adjusts the frame rate of the image capturing device to increase based on an increase in the actual fluid flow rate, and the controller adjusts the frame rate of the image capturing device to decrease based on a decrease in the actual fluid flow rate.

Assignees

• Carefusion 303 Inc

Inventors

• Bloom Mark
• Oscolai Cathal
• Brown David

Classifications

• H04N23/56

  provided with illuminating means · CPC title

• G06T2207/10016

  Video; Image sequence · CPC title

• G01N2291/02433

  Gases in liquids, e.g. bubbles, foams · CPC title

• G06T7/246 Primary

  using feature-based methods, e.g. the tracking of corners or segments · CPC title

• G01N2021/177

  Detector of the video camera type · CPC title