Method for projecting blood loss of a patient during a surgery

• US 10,555,675 B2
• Filed: 05/13/2016
• Issued: 02/11/2020
• Est. Priority Date: 05/15/2015
• Status: Active Grant

• Current Assignee: Gauss Surgical, Inc. (Stryker Corporation)
• Original Assignee: Gauss Surgical, Inc. (Stryker Corporation)
• Inventors: Satish, Siddarth, Miller, Kevin, De, Titas
• Primary Examiner(s): Bloch, Michael R
• Application Number:
  US15/154,921
• Publication Number:
  US 20160331248A1
• Time in Patent Office: 1,369 Days
• Field of Search: None
• CPC Class Codes: A61B 2576/00 Medical imaging apparatus involving image processing or analysis A61B1/00009, A61B6/52 and A61B8/52 take precedence; image processing per se G06T; details of algorithms for analysing medical images G06T7/0012
• CPC Class Codes: A61B 5/0077 Devices for viewing the surface of the body, e.g. camera, magnifying lens
• CPC Class Codes: A61B 5/02042 Determining blood loss or bleeding, e.g. during a surgical procedure
• CPC Class Codes: A61B 5/14546 for measuring analytes not otherwise provided for, e.g. ions, cytochromes
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/7445 Display arrangements, e.g. multiple display units
• CPC Class Codes: A61B 90/361 Image-producing devices, e.g. surgical cameras
• CPC Class Codes: G06T 2207/30004 Biomedical image processing
• CPC Class Codes: G06T 2207/30024 Cell structures in vitro; Tissue sections in vitro
• CPC Class Codes: G06T 7/0012 Biomedical image inspection
• CPC Class Codes: G16H 20/40 relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture
• CPC Class Codes: G16H 40/63 for local operation
• CPC Class Codes: G16H 50/70 for mining of medical data, e.g. analysing previous cases of other patients

Abstract

Systems for monitoring blood loss include a display for simultaneously depicting a current blood loss metric at different time points or along a time line. In addition, historical or comparative blood loss information is provided on the display so that the healthcare provider can see assess the current blood loss metric relative to other metrics, so that the healthcare provider can more accurately assess and manage the patient'"'"'s status.

Claims

1. A method of monitoring a patient in a medical procedure, comprising:

at one or more processors;

estimating real-time blood loss of the patient;

selecting at least one reference blood loss data set corresponding to a reference medical procedure;

estimating future blood loss of the patient based at least partially on the estimated real-time blood loss and the at least one reference blood loss data set; and

providing an indication of the estimated future blood loss of the patient on a display associated with the one or more processors.

2. The method of claim 1, wherein selecting at least one reference blood loss data set comprises selecting at least one reference blood loss data set from a database of prior medical procedures.

3. The method of claim 1, wherein the indication of estimated real-time blood loss and the estimated future blood loss are displayed simultaneously on a monitor screen.

4. The method of claim 1, further comprising displaying the estimated real-time blood loss and the indication of estimated future blood loss on a two-dimensional plot.

5. The method of claim 4, wherein the two-dimensional plot depicts estimated blood loss over time.

6. The method of claim 4, further comprising displaying the at least one reference blood loss data set on the two-dimensional plot.

7. The method of claim 6, wherein displaying the at least one reference blood loss data set comprises displaying at least one blood loss tracing over time.

8. The method of claim 7, wherein each of the at least one blood loss tracings is based upon a single historical medical procedure.

9. The method of claim 8, wherein displaying the at least one reference blood loss data set comprises displaying a plurality of database blood loss tracings over time.

10. The method of claim 6, wherein the at least one reference blood loss data set is provided as at least one band plot on the two-dimensional plot.

11. The method of claim 10, wherein the at least one band plot comprises a plurality of nested confidence bands on the two-dimensional plot.

12. The method of claim 6, wherein the estimated real-time blood loss and the estimated future blood loss are overlaid on the at least one reference blood loss data set.

13. The method of claim 1, further comprising receiving the at least one reference blood loss data set from a remote server.

14. The method of claim 1, wherein selecting the at least one reference blood loss data set is based at least in part upon type of medical procedure.

15. The method of claim 1, wherein selecting the at least one reference blood loss data set is based at least in part upon one or more patient factors.

16. The method of claim 15, wherein selecting the at least one reference blood loss data set is based at least in part upon one or more health condition or disease factors, or practice-based factors.

17. The method of claim 16, wherein the at least one reference blood loss data set comprises an average, median, mode or a range of historical blood loss values from a plurality of prior medical procedures.

18. The method of claim 17, wherein each of the plurality of prior medical procedures is a same type of procedure as the medical procedure.

19. The method of claim 18, wherein the plurality of prior medical procedures are medical procedures selected based upon n blood loss tracings closest to a curve-of-best-fit of a current blood loss tracing that includes the estimated real-time blood loss.

20. The method of claim 19, wherein n is between 2 and 50.

21. The method of claim 19, wherein n is between 2 and 10.

22. The method of claim 1, further comprising:

comparing the estimated real-time blood loss to a threshold value; and

displaying a message if the estimated real-time blood loss meets or exceeds the threshold value.

23. The method of claim 22, wherein the threshold value is a time-dependent threshold value.

24. The method of claim 22, wherein the threshold value is based on the at least one reference blood loss data set.

25. The method of claim 22, wherein the message is a clinical message indicating that a blood transfusion threshold has been met.

26. The method of claim 22, wherein the message is a clinical message indicating that a blood transfusion threshold is estimated to be met at a future time point.

27. The method of claim 1, wherein estimating future blood loss comprises providing at least two predicted future blood loss values, wherein one of the least two predicted future blood loss values is a lower limited predicted future blood loss value.

28. The method of claim 27, wherein one of the at least two predicted future blood loss values is an upper limited predicted future blood loss value.

29. The method of claim 1, wherein providing the indication of the estimated future blood loss comprises displaying a predicted future blood loss area plot.

30. The method of claim 1, wherein estimating real-time blood loss comprises estimating real-time blood loss based on at least one image.

31. The method of claim 30, wherein estimating real-time blood loss comprises evaluating a color-related value of the at least one image.

32. The method of claim 1, wherein estimating real-time blood loss comprises aggregating a plurality of real-time blood loss estimates from two or more images.