Ambient temperature sensor systems and methods

• US 9,326,708 B2
• Filed: 03/26/2010
• Issued: 05/03/2016
• Est. Priority Date: 03/26/2010
• Status: Active Grant

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Inventors: Hanson, Ian B., Mark, Dore, Daley, Sean, Moberg, Sheldon B., Buckman, Susie E., Bente, Paul F. IV
• Primary Examiner(s): Kahelin, Michael
• Assistant Examiner(s): TRAN, THO Q
• Application Number:
  US12/748,239
• Publication Number:
  US 20110237916A1
• Time in Patent Office: 2,230 Days
• Field of Search: 600/365, 600/319, 600/316, 600/331, 600/332, 600/347
• US Class Current: 1/1
• CPC Class Codes: A61B 5/0008 Temperature signals
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement

Abstract

A first sensor may be configured to measure a sensed amount of a physiological parameter and to generate a first signal based on the sensed amount of the physiological parameter measured by the first sensor. A second sensor may be configured to measure a temperature and to generate a second signal based on the temperate measured by the second sensor. A housing may have heat-generating electronics including a processor that may be configured to determine an overall amount of the physiological parameter based on the first signal generated from the first sensor and the second signal generated from the second sensor. The second sensor may be thermally insulated from the heat-generating electronics.

Claims

1. A monitoring system for measuring a physiological parameter, the system comprising:

a housing having electronics, the electronics including heat-generating electronics, a first sensor and a second sensor;

the first sensor configured to measure a sensed amount of a physiological parameter and to generate a first signal based on the sensed amount of the physiological parameter measured by the first sensor; and

the second sensor electrically connected to the electronics in the housing and configured to measure a temperature and to generate a second signal based on the temperature measured by the second sensor;

the heat-generating electronics comprising a processor configured to determine an overall amount of the physiological parameter based on the first signal generated from the first sensor and the second signal generated from the second sensor;

the second sensor held by a support structure, the second sensor thermally insulated from the heat-generating electronics and the first sensor and the second sensor are non-abutting; and

a thermal insulation material arranged to thermally insulate the second sensor from the heat-generating electronics and the first sensor, while the second sensor remains electrically connected to the heat-generating electronics in the housing, wherein the thermal insulation material is configured to thermally insulate the second sensor so that the temperature measured by the second sensor is thermally insulated from heat emitted by the first sensor, and the thermal insulation material is arranged between the first sensor and the second sensor through all direct line-of-sight convection paths from the first sensor to the second sensor such that the temperature measured by the second sensor is isolated from the heat emitted by the first sensor through all direct line-of-sight convection paths.

2. The system of claim 1, wherein the physiological parameter comprises a concentration of blood glucose.

3. The system of claim 1, wherein the thermal insulation material surrounds at least a portion of the second sensor, the thermal insulation material is adapted to thermally insulate the second sensor from heat generated by the heat-generating electronics.

4. The system of claim 1,

the housing having a chamber, the second sensor arranged within the chamber;

the chamber being coupled to the thermal insulation material; and

the chamber sufficiently located away from the heat-generating electronics to minimize an affect of the heat-generating electronics on the temperature measured by the second sensor.

5. The system of claim 4,

the chamber located at a location corresponding to approximately a furthest distance within the housing from the heat-generating electronics.

6. The system of claim 4,

the chamber located at a location corresponding to a coolest portion of the housing during operation of the monitoring system.

7. The system of claim 1, wherein the thermal insulation material surrounds at least a portion of the second sensor, the thermal insulation material adapted to thermally insulate the second sensor from at least one of heat generated by the heat-generating electronics and air external to the housing;

and

the housing has a chamber, the support structure arranged within the chamber of the housing.

8. The system of claim 1, the second sensor arranged external to the housing.

9. The system of claim 8, the second sensor attached to an external surface of the housing.

10. The system of claim 8, the second sensor located separate and spaced apart from the housing.

11. The system of claim 1, wherein the first sensor is arranged within the housing.

12. The system of claim 1,

the first sensor configured to measure the sensed amount of the physiological parameter at a location having a local temperature;

and

the second sensor adapted to be positioned relative to the housing at a location at which the temperature measured by the second sensor is closer to the local temperature than a temperature of a heat source emitted by the heat-generating electronics.

13. The system of claim 1, the system further comprising:

a heat-conductive material adapted to transfer heat away from at least one of a portion of the housing containing the heat-generating electronics and a portion of the housing containing the second sensor to raise or lower a temperature within the housing measured by the second sensor.

14. The system of claim 13, wherein the heat-conductive material comprises a heat sink.

15. The system of claim 1, the system further comprising:

a heat-conductive material adapted to transfer ambient temperature to at least one of a portion of the housing containing the heat-generating electronics and a portion of the housing containing the second sensor to raise or lower a temperature within the housing measured by the second sensor.

16. The system of claim 1, the housing having an opening for allowing air external to the housing to flow to at least one of a portion of the housing containing the heat-generating electronics and a portion of the housing containing the second sensor to raise or lower a temperature within the housing measured by the second sensor.

17. The system of claim 1, the system further comprising:

a ventilation device for providing air external to the housing to at least one of a portion of the housing containing the heat-generating electronics and a portion of the housing containing the second sensor to raise or lower a temperature within the housing measured by the second sensor.

18. The system of claim 1, the system further comprising:

a ventilation device for transferring air away from within at least one of a portion of the housing containing the heat-generating electronics and a portion of the housing containing the second sensor to outside the housing to raise or lower a temperature within the housing measured by the second sensor.

19. The system of claim 1, the processor further configured to provide an indicator based upon at least one of the first signal exceeding a threshold range and the second signal exceeding a threshold range.

20. The system of claim 1, the system further comprising:

a removable support structure for removable connection with the housing, the removable support structure for supporting the first sensor.

21. The system of claim 20, wherein the removable support structure comprises a test strip.

22. The system of claim 20, the housing having a receptacle for receiving at least a portion of the removable support structure and for providing an electrical connection for electrically connecting the removable support structure and the housing.

23. The system of claim 22, wherein the portion of the removable support structure receivable by the receptacle is an end of the removable support structure.

24. The system of claim 20, the removable support structure for supporting the second sensor.

25. The system of claim 20,

the removable support structure configured to measure the sensed amount of the physiological parameter at a location along the removable support structure;

and

the second sensor locatable at a position to be adjacent with the location on the removable support structure.

26. The system of claim 25,

the housing having a portion extending away from the housing;

and

the second sensor located along the portion extending away from the housing to be adjacent with the location on the removable support structure.

27. The system of claim 1, the second sensor sufficiently located from the heat-generating electronics to minimize an affect of the heat-generating electronics on the temperature measured by the second sensor.

28. The system of claim 27, the second sensor located at a location corresponding to approximately a furthest distance within the housing from the heat-generating electronics.

29. The system of claim 27, the second sensor located at a location corresponding to a coolest portion of the housing during operation of the monitoring system.

30. The monitoring system of claim 1, wherein the second sensor being in contact with the support structure and the support structure being in contact with a thermal insulation and the thermal insulation being in contact with the housing such that:

the second sensor fails to contact the thermal insulation; and

the support structure fails to contact the housing.

31. The monitoring system of claim 30, wherein the support structure forms a tray shape and the support structure has an opening to outside the housing.

32. The system of claim 1, wherein the support structure and the housing are separated by a first thermal insulating material that is made of different material than the housing.

33. The system of claim 32, further comprising a second thermal insulating material that separates the support structure and the housing.

34. The system of claim 1, further comprising at least two mounting structures, wherein the first sensor and the second sensor are mounted on different mounting structures.

35. The system of claim 1, wherein the first sensor held by a second support structure such that the second support structure is spaced apart from the support structure holding the second sensor.

36. The system of claim 1, wherein the thermal insulation material is arranged between the second sensor and a heat-emitting portion of the first sensor, the thermal insulation material is configured to thermally insulate the second sensor from the heat-emitting portion of the first sensor such that the temperature measured by the second sensor is substantially independent from the heat emitted by the heat-emitting portion of the first sensor.

37. The system of claim 1, wherein:

the second sensor is configured to sense an ambient temperature at approximately a location where enzyme reaction occurs while the second sensor is insulated from the first sensor by the thermal insulation material; and

the first sensor measures the sensed amount of the physiological parameter at approximately the location where enzyme reaction occurs.

38. The system of claim 1, wherein the thermal insulation material is directly connected to only one of the first sensor or the second sensor.

39. A method of manufacturing a monitoring system for measuring a physiological parameter, the method comprising:

providing a housing having electronics, the electronics including heat-generating electronics, a first sensor and a second sensor;

connecting the first sensor with the housing, the first sensor for measuring a sensed amount of a physiological parameter and for generating a first signal based on the sensed amount of the physiological parameter measured by the first sensor;

arranging the second sensor to be held by a support structure, the second sensor for measuring a temperature and for generating a second signal based on the temperature measured by the second sensor, and electrically connecting the second sensor to the electronics in the housing;

determining an overall amount of the physiological parameter based on the first signal generated from the first sensor and the second signal generated from the second sensor; and

thermally insulating, using a thermal insulation material, the second sensor from the heat-generating electronics and the first sensor, and the first sensor and the second sensor are non-abutting; and

placing the thermal insulation material to thermally insulate the second sensor from the first sensor and the heat-generating electronics that are located within the housing, while the second sensor remains electrically connected to the heat-generating electronics in the housing, wherein the thermal insulation material is configured to thermally insulate the second sensor so that the temperature measured by the second sensor is thermally insulated from heat emitted by the first sensor, and the thermal insulation material is arranged between the first sensor and the second sensor through all direct line-of-sight convection paths from the first sensor to the second sensor such that the temperature measured by the second sensor is isolated from the heat emitted by the first sensor through all direct line-of-sight convection paths.

40. A medical device for measuring a parameter, the device comprising:

a medical monitoring or treatment device configured to provide a monitoring or treatment operation on a user, the medical monitoring or treatment device configured to receive a first signal from a parameter sensor configured to detect an amount of a physiological parameter, the first signal being based on the amount of the physiological parameter detected by the parameter sensor;

a temperature sensor configured to measure a temperature and to generate a second signal based on the temperature measured by the temperature sensor;

wherein the parameter sensor and temperature sensor are non-abutting;

the temperature sensor held by a support structure and the temperature sensor electrically connected to a computing element;

a computing element configured to determine an overall amount of the physiological parameter based on the first signal and the second signal; and

the temperature sensor thermally insulated from heat produced within the medical monitoring or treatment device during use of the medical monitoring or treatment device; and

a thermal insulation material arranged to thermally insulate the temperature sensor from the heat-generating electronics and the parameter sensor, while the temperature sensor remains electrically connected to the computing element, wherein the thermal insulation material is configured to thermally insulate the temperature sensor so that the temperature measured by the temperature sensor is thermally insulated from heat emitted by the parameter sensor, and the thermal insulation material is arranged between the parameter sensor and the temperature sensor through all direct line-of-sight convection paths from the parameter sensor to the temperature sensor such that the temperature measured by the temperature sensor is isolated from the heat emitted by the parameter sensor through all direct line-of-sight convection paths.