Oxygen sensor calibration

Patent metadata

Field	Value
Publication number	US-11864893-B2
Application number	US-202117343362-A
Country	US
Kind code	B2
Filing date	Jun 9, 2021
Priority date	Sep 4, 2020
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

An example device includes processing circuitry configured to receive, from an oxygen sensor, an ambient air signal indicative of an oxygen partial pressure of ambient air. The processing circuitry is further configured to receive, from an atmospheric pressure sensor, an atmospheric pressure sensor signal indicative of atmospheric pressure. The processing circuitry is configured to determine, based on the atmospheric pressure sensor signal, an oxygen partial pressure of the ambient air, determine, based at least in part on the oxygen partial pressure of the ambient air and the ambient air signal, the one or more calibration parameters, and calibrate, based on the one or more calibration parameters, the oxygen sensor. The calibrated oxygen sensor may be used to, for example, determine the oxygen content of urine of a patient to monitor renal function of the patient.

First claim

What is claimed is:

1. A method comprising:
receiving, by processing circuitry and from an oxygen sensor, an ambient air signal indicative of an oxygen partial pressure of ambient air;
receiving, by the processing circuitry and from an atmospheric pressure sensor, an atmospheric pressure sensor signal indicative of atmospheric pressure;
determining, by the processing circuitry and based on the atmospheric pressure sensor signal, the oxygen partial pressure of the ambient air;
determining, by the processing circuitry and based at least in part on the oxygen partial pressure of the ambient air and the ambient air signal, one or more calibration parameters;
calibrating, by the processing circuitry and based on the one or more calibration parameters, the oxygen sensor;
receiving, by the processing circuitry and from the oxygen sensor, a signal indicative of an oxygen partial pressure of a fluid; and
determining, by the processing circuitry and based on the signal indicative of the oxygen partial pressure of the fluid and the one or more calibration parameters, a calibrated oxygen partial pressure of the fluid.

2. The method of claim 1 , wherein determining the calibrated oxygen partial pressure of the fluid comprises:
determining, by the processing circuitry, the oxygen partial pressure of the fluid based on the signal indicative of the oxygen partial pressure of the fluid; and
applying, by the processing circuitry, a function to the determined oxygen partial pressure of the fluid, wherein the function is based on the one or more calibration parameters.

3. The method of claim 2 , wherein the function is an offset.

4. The method of claim 1 , further comprising:
receiving, by the processing circuitry and from a temperature sensor, a temperature sensor signal indicative of a temperature of the ambient air,
wherein the one or more calibration parameters are further based on the temperature sensor signal.

5. The method of claim 1 , further comprising:
receiving, by the processing circuitry and from the oxygen sensor, an analyte signal indicative of an oxygen partial pressure of an analyte,
wherein the one or more calibration parameters are further based on the analyte signal.

6. The method of claim 5 , wherein the analyte is nitrogen or carbon dioxide.

7. The method of claim 5 , wherein the oxygen sensor is located in a gas tight container when sensing the oxygen partial pressure of the analyte.

8. The method of claim 5 , wherein determining the calibrated oxygen partial pressure of the fluid comprises:
determining, by the processing circuitry, the oxygen partial pressure of the fluid based on the signal indicative of the oxygen partial pressure of the fluid; and
applying a function to the determined oxygen partial pressure of the fluid, wherein the function is based on the one or more calibration parameters, and the one or more calibration parameters are further based on the analyte signal.

9. The method of claim 8 , wherein the function comprises a linear function.

10. The method of claim 8 , wherein the function is based on a Stern-Volmer relationship.

11. A device comprising:
a memory configured to store one or more calibration parameters; and
processing circuitry communicatively coupled to the memory, the processing circuitry being configured to:
receive, from an oxygen sensor, an ambient air signal indicative of an oxygen partial pressure of ambient air;
receive, from an atmospheric pressure sensor, an atmospheric pressure sensor signal indicative of atmospheric pressure;
determine, based on the atmospheric pressure sensor signal, the oxygen partial pressure of the ambient air;
determine, based at least in part on the oxygen partial pressure of the ambient air and the ambient air signal, the one or more calibration parameters; and
calibrate, based on the one or more calibration parameters, the oxygen sensor,
receive, from the oxygen sensor, a signal indicative of an oxygen partial pressure of a fluid; and
determine, based on the signal indicative of the oxygen partial pressure of the fluid and the one or more calibration parameters, a calibrated oxygen partial pressure of the fluid.

12. The device of claim 11 , wherein as part of determining the calibrated oxygen partial pressure of the fluid, the processing circuitry is configured to:
determine the oxygen partial pressure of the fluid based on the signal indicative of the oxygen partial pressure of the fluid; and
apply a function to the determined oxygen partial pressure of the fluid, wherein the function is based on the one or more calibration parameters.

13. The device of claim 12 , wherein the function is an offset.

14. The device of claim 11 , wherein the processing circuitry is further configured to:
receive, from a temperature sensor, a temperature sensor signal indicative of a temperature of the ambient air,
wherein the one or more calibration parameters are further based on the temperature sensor signal.

15. The device of claim 11 , wherein the processing circuitry is further configured to:
receive, from the oxygen sensor, an analyte signal indicative of an oxygen partial pressure of an analyte,
wherein the one or more calibration parameters are further based on the analyte signal.

16. The device of claim 15 , wherein the analyte is nitrogen or carbon dioxide.

17. The device of claim 15 , wherein the oxygen sensor is configured to sense the oxygen partial pressure of the analyte when the oxygen sensor is located in a gas tight container.

18. The device of claim 15 , wherein as part of determining the calibrated oxygen partial pressure of the fluid, the processing circuitry is configured to:
determine the oxygen partial pressure of the fluid based on the signal indicative of the oxygen partial pressure of the fluid; and
apply a function to the determined oxygen partial pressure of the fluid, wherein the function is based on the one or more calibration parameters, and the one or more calibration parameters are further based on the analyte signal.

19. The device of claim 18 , wherein the function comprises a linear function.

20. A device comprising:
a memory configured to store one or more calibration parameters; and
processing circuitry communicatively coupled to the memory, the processing circuitry being configured to:
receive, from an oxygen sensor, an ambient air signal indicative of an oxygen partial pressure of ambient air;
receive, from an atmospheric pressure sensor, an atmospheric pressure sensor signal indicative of atmospheric pressure;
determine, based on the atmospheric pressure sensor signal, the oxygen partial pressure of the ambient air;
determine, based at least in part on the oxygen partial pressure of the ambient air and the ambient air signal, the one or more calibration parameters;
calibrate, based on the one or more calibration parameters, the oxygen sensor;
receive, from the oxygen sensor, a signal indicative of an oxygen partial pressure of urine; and
determine, based on the signal indicative of the oxygen partial pressure of the urine and the one or more calibration parameters, a calibrated oxygen partial pressure of the urine.

Assignees

• Covidien Lp

Inventors

• Dove Jacob D
• Aasmul Søren
• Smith William S
• Miller David J
• Kristensen Jesper Svenning

Classifications

• A61B5/1495 Primary

  Calibrating or testing of in-vivo probes · CPC title

• A61B5/14503

  invasive, e.g. introduced into the body by a catheter or needle or using implanted sensors (A61B5/1459, A61B5/1464, A61B5/1473, A61B5/1482, A61B5/14865 take precedence) · CPC title

• A61B5/14507

  specially adapted for measuring characteristics of body fluids other than blood (devices for taking samples of body liquids A61B10/0045) · CPC title

• A61B5/14542

  for measuring blood gases (A61B5/14551 takes precedence) · CPC title

• A61B5/207

  Sensing devices adapted to collect urine · CPC title