System and methods for managing blood loss of a patient

Patent metadata

Field	Value
Publication number	US-11712183-B2
Application number	US-202017096716-A
Country	US
Kind code	B2
Filing date	Nov 12, 2020
Priority date	May 14, 2012
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

One variation of the method for managing blood loss of a patient includes: receiving an image of a physical sample; extracting a feature from an area of the image corresponding to the physical sample; estimating a blood volume indicator of the physical sample according to the extracted feature; estimating a patient blood loss based on the blood volume indicator; estimating a euvolemic patient hematocrit based on an estimated patient blood volume and the estimated patient blood loss; receiving a measured patient hematocrit; and generating a volemic status indicator based on a comparison between the measured patient hematocrit and the estimated euvolemic patient hematocrit.

First claim

What is claimed is:

1. A method comprising:
estimating, by one or more processors, an initial blood volume from a weight and height of a patient;
estimating, by the one or more processors, a first extracorporeal blood content of one or more physical samples;
accessing, by the one or more processors, an initial hematocrit of the patient;
estimating, by the one or more processors, a first blood lost volume from the first extracorporeal blood content and the initial hematocrit;
estimating, by the one or more processors, a first updated hematocrit of the patient based on the initial hematocrit of the patient, the initial blood volume of the patient and the first blood lost volume;
estimating, by the one or more processors, a second extracorporeal blood content of one or more physical samples; and
estimating, by the one or more processors, a second blood lost volume from the second extracorporeal blood content and the first updated hematocrit.

2. The method of claim 1 , further comprising:
estimating, by the one or more processors, a second updated hematocrit of the patient based on the first updated hematocrit of the patient, the initial blood volume of the patient and the first and second blood lost volumes.

3. The method of claim 1 wherein the initial blood volume is estimated from the height, weight and a gender of the patient.

4. The method of claim 1 , further comprising:
determining, by the one or more processors, that a quantity of a fluid is intravenously provided to a patient; and
estimating, by the one or more processors, a second updated hematocrit of the patient based on the first updated hematocrit of the patient and the quantity of the fluid intravenously provided to the patient.

5. The method of claim 1 , wherein the estimating of an extracorporeal blood content of a physical sample includes:
accessing an image of the physical sample;
extracting a feature from the image of the physical sample; and
estimating the extracorporeal blood content of the physical sample based on the feature extracted from the image of the physical sample.

6. The method of claim 1 , further comprising:
causing presentation of an alarm based on a total blood lost volume.

7. The method of claim 1 , further comprising:
determining, by the one or more processors, that a quantity of a blood transfusion is provided to the patient; and
estimating, by the one or more processors, a second updated hematocrit of the patient based on the first updated hematocrit of the patient, a hematocrit of the blood transfusion, and the quantity of the blood transfusion.

8. A system comprising:
one or more processors; and
a computer-readable medium storing instructions that, when executed by the one or more processors, causes the one or more processors to perform operations comprising:
estimating an initial blood volume from a weight and height of a patient;
estimating a first extracorporeal blood content of one or more physical samples;
accessing an initial hematocrit of the patient;
estimating a first blood lost volume from the first extracorporeal blood content and the initial hematocrit;
estimating a first updated hematocrit of the patient based on the initial hematocrit of the patient, the initial blood volume of the patient and the first blood lost volume;
estimating a second extracorporeal blood content of one or more physical samples; and
estimating a second blood lost volume from the second extracorporeal blood content and the first updated hematocrit.

9. The system of claim 8 , wherein the operations further comprise:
estimating a second updated hematocrit of the patient based on the first updated hematocrit of the patient, the initial blood volume of the patient and the first and second blood lost volumes.

10. The system of claim 8 , wherein the initial blood volume is estimated from the height, weight and a gender of the patient.

11. The system of claim 8 , wherein the operations further comprise:
determining that a quantity of a fluid is intravenously provided to a patient; and
Estimating a second updated hematocrit of the patient based on the first updated hematocrit of the patient and the quantity of the fluid intravenously provided to the patient.

12. The system of claim 8 , wherein the operation of estimating an extracorporeal blood content of a physical sample includes:
accessing an image of the physical sample;
extracting a feature from the image of the physical sample; and
estimating the extracorporeal blood content of the physical sample based on the feature extracted from the image of the physical sample.

13. The system of claim 8 , wherein the operations further comprise:
causing presentation of an alarm based on a total blood lost volume.

14. The system of claim 8 , wherein the operations further comprise:
Determining that a quantity of a blood transfusion is provided to the patient; and
Estimating a second updated hematocrit of the patient based on the first updated hematocrit of the patient, a hematocrit of the blood transfusion, and the quantity of the blood transfusion.

15. A computer-readable medium storing instructions that, when executed by one or more processors, causes the one or more processors to perform operations comprising:
estimating an initial blood volume from a weight and height of a patient;
estimating a first extracorporeal blood content of one or more physical samples;
accessing an initial hematocrit of the patient;
estimating a first blood lost volume from the first extracorporeal blood content and the initial hematocrit;
estimating a first updated hematocrit of the patient based on the initial hematocrit of the patient, the initial blood volume of the patient and the first blood lost volume;
estimating a second extracorporeal blood content of one or more physical samples; and
estimating a second blood lost volume from the second extracorporeal blood content and the first updated hematocrit.

16. The computer-readable medium of claim 15 , wherein the operations further comprise:
estimating a second updated hematocrit of the patient based on the first updated hematocrit of the patient, the initial blood volume of the patient and the first and second blood lost volumes.

17. The computer-readable medium of claim 15 , wherein the initial blood volume is estimated from the height, weight and a gender of the patient.

18. The computer-readable medium of claim 15 , wherein the estimating of an extracorporeal blood content of a physical sample includes:
accessing an image of the physical sample;
extracting a feature from the image of the physical sample; and
estimating the extracorporeal blood content of the physical sample based on the feature extracted from the image of the physical sample.

19. The computer-readable medium of claim 15 , wherein the operations further comprise:
causing presentation of an alarm based on a total blood lost volume.

20. The computer-readable medium of claim 15 , wherein the operations further comprise:
determining, by the one or more processors, that a quantity of a blood transfusion is provided to the patient; and
estimating, by the one or more processors, a second updated hematocrit of the patient based on the first updated hematocrit of the patient, a hematocrit of the blood transfusion, and the quantity of the blood transfusion.

Assignees

• Gauss Surgical Inc

Inventors

• Satish Siddarth
• Zandifar Ali
• Miller Kevin J

Classifications

• A61B5/14535 Primary

  for measuring haematocrit · CPC title

• A61B5/0082

  adapted for particular medical purposes · CPC title

• A61B5/02028

  Determining haemodynamic parameters not otherwise provided for, e.g. cardiac contractility or left ventricular ejection fraction · CPC title

• A61B5/02042

  Determining blood loss or bleeding, e.g. during a surgical procedure · CPC title

• A61B5/4848

  Monitoring or testing the effects of treatment, e.g. of medication · CPC title