Granted Patent B2

US 12,373,976 · App. 18/238,620 · Granted Jul 29, 2025

Inventors: Siddarth Satish (Portola Valley, CA); Kevin J. Miller (Mountain View, CA); Ali Zandifar (San Francisco, CA)

Assignee: Stryker Corporation

G06T7/62G06T5/00A61B5/02042G06T2207/10024G06T2207/30004

Abstract

Claims (40)

1. A method for estimating extracorporeal blood volume within a fluid canister containing fluids including blood and non-blood fluid, wherein an optical sensor is supported to be facing the fluid canister, the method comprising:

activating a light source;

capturing an image of the fluid canister with the optical sensor with the light source activated;

extracting a color-related feature from at least a portion of the image;

estimating a concentration of hemoglobin within the fluids based on the extracted color-related feature, wherein a correlation of the color-related feature with the concentration of hemoglobin is enhanced by the light source being active during the step of capturing the image;

estimating the extracorporeal blood volume based on the estimated concentration of hemoglobin and a fluid level or fluid volume within the fluid canister; and

displaying on a display the estimated extracorporeal blood volume.

2. The method of claim 1 , wherein the image is a color frame of a video feed.

3. The method of claim 2 , further comprising displaying on the display a dynamic augmented reality overlay in which the video feed is displayed and updated with each new color frame or number of color frames.

4. The method of claim 1 , further comprising capturing subsequent sample images of the fluid canister as fluid is added to the fluid canister to monitor the estimated extracorporeal blood volume over time.

5. The method of claim 4 , further comprising triggering an alarm based on the estimated extracorporeal blood volume reaching a critical total volume or critical rate of blood loss.

6. The method of claim 1 , further comprising implementing edge detection to isolate the fluid canister from a background of a field of view of the optical sensor.

7. The method of claim 1 , wherein the estimated concentration of hemoglobin based on the extracted color-related feature is according to a parametric model.

8. The method of claim 1 , wherein the optical sensor is mounted to a side of the fluid canister.

9. The method of claim 1 , wherein the light source is a lamp or laser.

10. A method for estimating extracorporeal blood volume within a fluid canister containing fluids including blood and non-blood fluid, wherein an optical sensor is supported to be facing the fluid canister, the method comprising:

capturing an image of the fluid canister with the optical sensor;

extracting a color-related feature from at least a portion of the image;

estimating a fluid level of the fluids within the fluid canister from the image;

estimating a concentration of hemoglobin within the fluids based on the extracted color-related feature, wherein a correlation of the color-related feature with the concentration of hemoglobin is enhanced by a light source being active during the step of capturing the image;

estimating the extracorporeal blood volume based on the estimated concentration of hemoglobin and the estimated fluid level; and

displaying on a display the estimated extracorporeal blood volume.

11. The method of claim 10 , wherein the image is a color frame of a video stream.

12. The method of claim 11 , further comprising displaying on the display a dynamic augmented reality overlay in which the video stream is displayed and updated with each new color frame or number of color frames.

13. The method of claim 10 , further comprising capturing subsequent images of the fluid canister as fluid is added to the fluid canister to monitor the estimated extracorporeal blood volume and the estimated fluid level over time.

14. The method of claim 10 , wherein the estimated concentration of hemoglobin based on the extracted color-related feature is according to a parametric model.

15. The method of claim 10 , further comprising activating a light source, wherein the step of capturing the image is performed with the light source activated.

16. A system for determining extracorporeal blood volume in a fluid canister containing fluids including blood and non-blood fluid, the system comprising:

an optical sensor configured to capture an image of at least a portion of the fluid canister;

a light source;

a processor in electronic communication with the optical sensor and configured to:

cause the optical sensor to capture an image of the fluid canister with the light source activated;

extract a color-related feature from at least a portion of the image;

estimate a concentration of hemoglobin within the fluid based on the extracted color-related feature, wherein a correlation of the color-related feature with the concentration of hemoglobin is enhanced by the light source being active during the step of capturing the image;

estimate the extracorporeal blood volume based on the estimated concentration of hemoglobin; and

a display in communication with the processor and configured to display the extracorporeal blood volume.

17. The system of claim 16 , wherein the processor is further configured to estimate a fluid level of fluid within the fluid canister from the image, wherein the extracorporeal blood volume is estimated based on the estimated concentration of hemoglobin and the estimated fluid level.

18. The system of claim 17 , wherein the processor is further configured to cause the optical sensor to capture a video stream of the fluid canister, wherein the image is a color frame of the video stream.

19. The system of claim 18 , wherein the processor is further configured to monitor the estimated extracorporeal blood volume and the estimated fluid level over time based on subsequent color frames of the video stream.

20. The system of claim 16 , wherein the optical sensor is disposed on a handheld mobile device mounted to a side of the fluid canister.

Assignments (3)

Continuity (8)

References Cited (400)