Polar plot to represent glucose sensor performance

Patent metadata

Field	Value
Publication number	US-9307936-B2
Application number	US-201213467728-A
Country	US
Kind code	B2
Filing date	May 9, 2012
Priority date	Oct 26, 2011
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

Disclosed are methods, apparatuses, etc. for providing a visual expression of the performance of one or more blood glucose sensors. In one particular example, a relative comparison of a rate of change sensor blood glucose and a rate of change in reference blood glucose may be expressed in a polar plot or graph. The polar plot or graph may then be generated onto a visual medium.

First claim

What is claimed is:

1. A method comprising:
obtaining a plurality of blood glucose reference samples from a patient;
obtaining a plurality of glucose sensor measurements using a glucose sensor in contact with the patient;
computing a first rate of change in blood glucose concentration as observed from two or more of the plurality of blood glucose reference samples;
computing a second rate of change in the blood glucose concentration as observed from two or more of the plurality of glucose sensor measurements;
generating an angular coordinate and a radial coordinate of a polar plot,
wherein the angular coordinate is a function of the first rate of change and the second rate of change, and
wherein the radial coordinate is proportional to a magnitude of a blood glucose concentration of the patient as measured from one or more of the plurality of blood glucose reference samples; and

generating signals to present a graphical representation of a value on the polar plot in a visual medium, wherein the value corresponds to the angular coordinate and the radial coordinate, and
wherein the computing the first rate of change, the computing the second rate of change, the generating the angular coordinate and the radial coordinate, and the generating signals to present the graphical representation are performed by one or more processors.

2. The method of claim 1 , and further comprising defining an alert region of the polar plot comprising a hypoglycemic region within a threshold radius and an angular section defined, at least in part, by a positive rate of change in blood glucose according to the second rate of change and a negative rate of change according to the first rate of change.

3. The method of claim 1 , wherein the angular coordinate is based, at least in part, on the arctangent of a ratio of the second rate of change to the first rate of change.

4. The method of claim 1 , wherein the visual medium comprises a printed document.

5. The method of claim 1 , wherein the visual medium comprises an image presented on a computer display.

6. The method of claim 1 , wherein the computing the second rate of change further comprises:
obtaining a first value associated with a first blood glucose reference sample of the plurality of blood glucose reference samples at a beginning of a period;
obtaining a second value associated with a second blood glucose reference sample of the plurality of blood glucose reference samples at an end of the period; and
dividing a difference between the first and second values by the period.

7. The method of claim 6 , wherein the radial coordinate is proportional to a magnitude of a blood glucose concentration of the second blood glucose reference sample.

8. A computing platform for use with a glucose sensor in contact with a patient, comprising:
one or more processors to:
receive a first plurality of signals generated in response to a plurality of blood glucose reference samples from the patient;
receive a second plurality of signals generated in response to a plurality of glucose sensor measurements using the glucose sensor in contact with the patient;
compute a first rate of change in blood glucose concentration based, at least in part, on two or more of the plurality of blood glucose reference samples;
compute a second rate of change in the blood glucose concentration based, at least in part, on two or more of the plurality of glucose sensor measurements;
generate an angular coordinate and a radial coordinate of a polar plot,
wherein the angular coordinate is a function of the first rate of change and the second rate of change, and
wherein the radial coordinate is proportional to a magnitude of a blood glucose concentration of the patient as measured from one or more of the plurality of blood glucose reference samples; and

generate signals to present a graphical representation of a value on the polar plot in a visual medium, wherein the value corresponds to the angular coordinate and the radial coordinate.

9. The computing platform of claim 8 , and further comprising a display device to present an image of the graphical representation responsive to the generated signals.

10. The computing platform of claim 8 , and further comprising a storage medium to store a digital image of the graphical representation in a compressed format.

11. The computing platform of claim 8 , wherein the signals comprise commands to a printer for printing the graphical representation onto a printed document.

12. The computing platform of claim 8 , and further comprising a communication device, the one or more processors further to initiate transmission of the generated signals to a communication network.

13. An article for use with a glucose sensor in contact with a patient, comprising:
a non-transitory storage medium comprising machine-readable instructions stored thereon which are executable by a special purpose computing apparatus to:
receive a first plurality of signals generated in response to a plurality of blood glucose reference samples from the patient;
receive a second plurality of signals generated in response to a plurality of glucose sensor measurements using the glucose sensor in contact with the patient;
compute a first rate of change in blood glucose concentration based, at least in part, on two or more of the plurality of blood glucose reference samples;
compute a second rate of change in the blood glucose concentration based, at least in part, on two or more of the plurality of glucose sensor measurements;
generate an angular coordinate and a radial coordinate of a polar plot,
wherein the angular coordinate is a function of the first rate of change and the second rate of change; and
wherein the radial coordinate is proportional to a magnitude of a blood glucose concentration of the patient as measured from one or more of the plurality of blood glucose reference samples; and

generate signals to present a graphical representation of a value on the polar plot in a visual medium, wherein the value corresponds to the angular coordinate and the radial coordinate.

14. The article of claim 13 , wherein the instructions are further executable by the special purpose computing apparatus to compress a digital image of the graphical representation in a format for storage in a non-transitory storage medium or for transmission in a communication network.

15. The article of claim 13 , wherein the instructions are further executable by the special purpose computing apparatus to compute the second rate of change by:
obtaining a first value associated with a first blood glucose reference sample of the plurality of blood glucose reference samples at a beginning of a period;
obtaining a second value associated with a second blood glucose reference sample of the plurality of blood glucose reference samples at an end of the period; and
dividing a difference between the first and second values by the period.

16. The article of claim 15 , wherein the radial coordinate is proportional to a magnitude of a blood glucose concentration of the second blood glucose reference sample.

17. The article claim 13 , wherein the generated signals comprise signals for presenting an image of the graphical representation on a display.

18. An apparatus for use with a glucose sensor in contact with a patient, comprising:
means for receiving a first plurality of signals generated in response to a plurality of blood glucose reference samples from the patient;
means for receiving a second plurality of signals generated in response to a plurality

Assignees

• Gottlieb Rebecca K
• Luo Ying
• Yang Ning
• Chase James Geoffrey
• Medtronic Minimed Inc

Inventors

• Gottlieb Rebecca K
• Luo Ying
• Yang Ning
• Chase James Geoffrey

Classifications

• A61B5/743

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• A61B5/7239

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• A61B5/4839

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• A61B5/1495

  Calibrating or testing of in-vivo probes · CPC title

• A61B5/6849

  in combination with a needle set · CPC title