Cardiac and temperature monitor

Patent metadata

Field	Value
Publication number	US-12521045-B2
Application number	US-202217821964-A
Country	US
Kind code	B2
Filing date	Aug 24, 2022
Priority date	Sep 1, 2021
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A medical system including processing circuitry configured to assess a blood glucose level of a patient. The processing circuitry is configured to use a cardiac signal indicative of the electrical activity of the patient's heart and a temperature signal indicative of a body temperature of the patient. The cardiac signal may be, for example, an electrocardiogram (ECG), an electrogram (EGM), or another measure. The medical system is configured to determine a representative cardiac measure indicative of the cardiac signal and determine a representative temperature measure indicative of the temperature signal. The medical system is configured to assess when a blood glucose level of the patient may be outside a euglycemic range based on the representative cardiac measure and the representative temperature measure determined.

First claim

What is claimed is:

1 . A medical system comprising:
a housing configured to contact a body of a patient; an electrode supported by the housing, the electrode configured to sense a cardiac signal indicative of an electrical activity of a heart of the patient; a temperature sensor configured to sense a temperature signal indicative of a body temperature of the patient; a memory; and processing circuitry supported by the housing and operably connected to the memory, wherein the processing circuitry is configured to:
define a cardiac threshold for the patient, wherein the cardiac threshold is indicative of the electrical activity of the heart when the patient is in a euglycemic range,
define a temperature threshold for the patient, wherein the temperature threshold is indicative of the body temperature when the patient is in the euglycemic range,
store the cardiac threshold and the temperature threshold using the memory,
receive the cardiac signal via the electrode and receive the temperature signal via the temperature sensor, and
assess a glycemic state of the patient by:
retrieving the cardiac threshold and the temperature threshold from the memory,
determining a representative cardiac measure using the cardiac signal,
comparing the representative cardiac measure and the cardiac threshold to determine a cardiac deviation,
determining a representative temperature measure using the temperature signal,
comparing the representative temperature measure and the temperature threshold to determine a temperature deviation, and
generating a communication indicative of the glycemic state only when the cardiac deviation meets or exceeds a cardiac deviation limit and also the temperature deviation meets or exceeds a temperature deviation limit.

2 . The medical system of claim 1 , wherein the temperature sensor is supported by the housing.

3 . The medical system of claim 1 , wherein the processing circuitry is configured to determine one or more cardiac measures using the cardiac signal, and wherein the processing circuitry is configured to determine the representative cardiac measure using the one or more cardiac measures.

4 . The medical system of claim 1 , wherein the processing circuitry is configured to determine one or more temperature measures using the temperature signal, and wherein the processing circuitry is configured to determine the representative temperature measure using the one or more temperature measures.

5 . The medical system of claim 1 , wherein the processing circuitry is configured to define a set of thresholding cardiac measures using the cardiac signal, and wherein the processing circuitry is configured to determine the cardiac threshold using the set of thresholding cardiac measures.

6 . The medical system of claim 1 , wherein the processing circuitry is configured to define a set of thresholding temperature measures using the temperature signal, and wherein the temperature threshold is determined based on the set of thresholding temperature measures.

7 . The medical system of claim 1 , wherein the processing circuitry is configured to:
define a set of thresholding cardiac measures comprising a set of cardiac signals received over a thresholding window, and determine the cardiac threshold using the set of thresholding cardiac measures; and define a set of sensed cardiac measures comprising a set of cardiac signals received over a beat window, and determine the representative cardiac measure using the set of sensed cardiac measures, wherein the thresholding window chronologically precedes the beat window.

8 . The medical system of claim 7 , wherein the processing circuitry is configured to:
define a redefined beat window by defining a new sensed cardiac measure using the cardiac signal, update the set of sensed cardiac measures by replacing at least one of a cardiac signal of the set of cardiac signals received over the beat window with the new sensed cardiac measure, wherein the at least one of the cardiac signal of the set of cardiac signals received over the beat window chronologically precedes the new sensed cardiac measure, and determine the representative cardiac measure using the updated set of sensed cardiac measures.

9 . The medical system of claim 8 , wherein the processing circuitry is configured to:
define a new sensed temperature measure during the redefined beat window using the temperature signal, and determine the representative temperature measure using the new sensed temperature measure.

10 . The medical system of claim 1 , wherein the processing circuitry is configured to:
define a set of thresholding temperature measures comprising a set of temperature signals received over a thresholding window, and determine the temperature threshold using the set of thresholding temperature measures; and define a set of sensed temperature measures comprising a set of temperature signals received over a beat window, and determine the representative temperature measure using the set of sensed temperature measures, and wherein the thresholding window chronologically precedes the beat window.

11 . The medical system of claim 1 , wherein the processing circuitry is configured to increment a count of a tracking counter when the processing circuitry generates the communication, wherein the processing circuitry is configured to issue a system alert indicative of the glycemic state of the patient when the count of the tracking counter exceeds an alert threshold.

12 . The medical system of claim 11 ,
wherein the processing circuitry is configured to generate a second communication when either the cardiac deviation fails to meet or exceed the cardiac deviation limit or the temperature deviation fails to meet or exceed the temperature deviation limit, and wherein the processing circuitry is configured to decrement the count of the tracking counter when the processing circuitry generates the second communication.

13 . The medical system of claim 12 , wherein the medical system is configured to generate an output viewable by the patient in response to the system alert.

14 . The medical system of claim 1 , wherein the cardiac signal is indicative of one or more parameters of at least one of a P-wave, a Q-wave, and R-wave, an S-wave, or a T-wave, and where the representative cardiac measure is a summary statistic of the one or more parameters.

15 . A medical system comprising:
a housing configured to contact a body of a patient; an electrode supported by the housing, the electrode configured to sense a cardiac signal indicative of an electrical activity of a heart of the patient; a temperature sensor supported by the housing, the temperature sensor configured to sense a temperature signal indicative of a body temperature of the patient; a memory supported by the housing; and processing circuitry supported by the housing and operably connected to the memory, wherein the processing circuitry is configured to:
define a cardiac threshold for the patient, wherein the cardiac threshold is indicative of the electrical activity of the heart when the patient is in a euglycemic range,
define a temperature threshold for the patient, wherein the temperature threshold is indicative of the body temperature when the patient is in the euglycemic range,
store the cardiac threshold and the temperature threshold using the memory,
receive the cardiac signal via the electrode and determine one or more cardiac measures using the cardiac signal, and determine a representative cardiac measure using the one or more cardiac measures;
receive the temperature signal

Assignees

• Medtronic Inc

Inventors

• Shrivastav Maneesh
• Musley Shailesh Kumar V
• Sharma Vinod

Classifications

• A61B5/0008

  Temperature signals · CPC title

• A61B5/746

  Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms · CPC title

• A61B5/355

  Detecting T-waves · CPC title

• A61B5/352

  Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval · CPC title

• A61B2562/0271

  Thermal or temperature sensors · CPC title