Combined core temperature and skin temperature sensor

1. A temperature monitoring device configured to measure a core temperature and a skin temperature of a patient, the temperature monitoring device comprising:

a flexible substrate, comprising;

a first side surface;

a second side surface;

a center section;

a first tail section extending radially from the center section in a first direction;

a second tail section extending radially from the center section in a second direction; and

a tab section extending radially from the center section in a third direction,

wherein the first tail section is at least partially folded over the center section to form the temperature monitoring device;

an electrical circuit on the first side surface of the flexible substrate, the electrical circuit comprising:

an electrically conductive heater trace, surrounding a central zone at a center of the center section of the flexible substrate;

a first thermal sensor disposed in the central zone;

a second thermal sensor disposed on the first tail section;

a third thermal sensor disposed on the second tail section;

a plurality of electrical pads disposed on the tab section; and

a plurality of conductive traces connecting each of the plurality of electrical pads with one of the first thermal sensor, the second thermal sensor, the third thermal sensor and the heater trace;

a first flexible insulator between the first thermal sensor and the second thermal sensor when the first tail section is folded over the center section; and

a second flexible insulator disposed in the central zone to insulate the first thermal sensor from the heater trace,

wherein the first tail section is folded over the first flexible insulator and the center section to position the first thermal sensor directly over the second thermal sensor in a vertical line drawn through the flexible substrate from the first side surface to the second side surface, with the first flexible insulator located between the first thermal sensor and the second thermal sensor, and

wherein the third thermal sensor is located apart from the first thermal sensor and the second thermal sensor when the first tail section is at least partially folded over the center section, such that the first thermal sensor and the second thermal sensor are arranged to measure the core temperature of the patient and the third thermal sensor is configured to measure the skin temperature of the patient.

2. The temperature monitoring device of claim 1 , further comprising multiple heater zones formed by the heater trace, wherein the multiple heater zones are located on the center section of the flexible substrate around the central zone.

3. The temperature monitoring device of claim 1 , wherein the plurality of electrical pads comprises five electrical pads configured to slide into and out of connection with a plug of a patient vital signs monitoring system.

4. The temperature monitoring device of claim 3 , further comprising a flexible stiffener disposed on the second side surface of the flexible substrate along the tab section and a portion of the center section to support the temperature monitoring device being slid into and out of the plug.

5. The temperature monitoring device of claim 1 , further comprising an adhesive on the second side surface of the flexible substrate.

6. The temperature monitoring device of claim 1 , further comprising:

multiple heater zones formed by the heater trace, wherein the multiple heater zones are located on the center section of the flexible substrate around the central zone; and

multiple slits in the flexible substrate, wherein each of the multiple slits is located between two of the multiple heater zones.

7. The temperature monitoring device of claim 6 , wherein a standoff distance between a perimeter of the center section and the third thermal sensor is sufficiently long to thermally isolate the third thermal sensor from the multiple heater zones.

8. The temperature monitoring device of claim 1 , wherein a standoff distance between the first thermal sensor and the second thermal sensor is at least twice a radial distance from the first thermal sensor to a perimeter of the center section.

9. The temperature monitoring device of claim 8 , wherein the first direction of the first tab is oriented 90 degrees around the center section from the second direction of the second tab and 180 degrees around the center section from the third direction of the tab section.