IP Library › Granted Patent US 12,521,021
Granted Patent B2
US 12,521,021 · App. 17/933,604 · Granted Jan 13, 2026

Wearable device for noninvasive body temperature measurement

Inventors: Ammar Al-ALi (San Juan Capistrano, CA); Stephen Scruggs (Newport Beach, CA); Joel Amposta (Irvine, CA); Valery G. Telfort (Irvine, CA)
Assignee: Masimo Corporation
A61B5/01A61B5/6832G01K1/16G01K7/22G01K13/20A61B2562/0271A61B2562/043
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Quick Facts
Patent No.
US 12,521,021
App. No.
17/933,604
Granted
Jan 13, 2026
Kind
B2
Abstract

A wearable device configured to secure to skin of a user and noninvasively measure body temperature of the user can include first and second pairs of temperature sensors configured to generate one or more signals responsive to detected thermal energy, a thermally conductive element positioned at least partially between the second pair of temperature sensors, and one or more hardware processors configured to receive the one or more signals generated by each of said first and second pairs of temperature sensors and determine one or more body temperature values of the user based on at least comparisons between different ones of the first and second pairs of temperature sensors. In some implementations, the wearable device includes thermally conductive probes for transmitting thermal energy toward ones of the first and second pairs of temperature sensors and a substrate positioned between the probes and the skin.

Claims (61)

1 . A wearable device configured to secure to skin of a user and noninvasively measure body temperature of the user, the wearable device comprising:

a first pair of temperature sensors, said first pair of temperature sensors comprising a first temperature sensor and a second temperature sensor, each of said first and second temperature sensors configured to generate one or more signals responsive to detected thermal energy, said first temperature sensor operably positioned to be closer to the user's skin than the second temperature sensor when the wearable device is secured to the user's skin, wherein the first pair of temperature sensors are thermally insulated from one another by an air gap;

a second pair of temperature sensors spaced from said first pair of temperature sensors, said second pair of temperature sensors comprising a third temperature sensor and a fourth temperature sensor, each of said third and fourth temperature sensors configured to generate one or more signals responsive to detected thermal energy, said third temperature sensor operably positioned to be closer to the user's skin than the fourth temperature sensor when the wearable device is secured to the user's skin;

a thermally conductive element positioned at least partially between the third and fourth temperature sensors; and

one or more hardware processors configured to:

receive said one or more signals generated by each of said first and second temperature sensors;

receive said one or more signals generated by each of said third and fourth temperature sensors;

determine one or more body temperature values of the user based on at least:

a first comparison between said one or more signals generated by said first temperature sensor and said one or more signals generated by said second temperature sensor; and

a second comparison between said one or more signals generated by said third temperature sensor and said one or more signals generated by said fourth temperature sensor.

2 . The wearable device of claim 1 , wherein:

the wearable device further comprises a first circuit board and a second circuit board, the first and second circuit boards spaced from one another, the first circuit board positioned closer to the skin of the user than the second circuit board when the wearable device is secured to the user's skin;

said first temperature sensor is mounted to the first circuit board and the second temperature sensor is mounted to the second circuit board;

said third temperature sensor is mounted to the first circuit board and spaced from the first temperature sensor;

said fourth temperature sensor is mounted to the second circuit board and spaced from the second temperature sensor;

a distance between the first temperature sensor and the second circuit board at least partially defines said air gap; and

said thermally conductive element is positioned between the third temperature sensor and a portion of the second circuit board that is adjacent to the fourth temperature sensor.

3 . The wearable device of claim 2 , wherein:

said first circuit board comprises a first surface and a second surface;

said second circuit board comprises a first surface and a second surface;

said first surface of the first circuit board faces toward the second surface of the second circuit board;

said first and third temperature sensors are mounted on the first surface of the first circuit board;

said second and fourth temperature sensors are mounted on the first surface of the second circuit board; and

said thermally conductive element is positioned between the third temperature sensor and a portion of the second surface of the second circuit board that is adjacent to the fourth temperature sensor.

4 . The wearable device of claim 3 , wherein said second circuit board comprises at least one opening positioned between the fourth temperature sensor and a portion of said thermally conductive element, said at least one opening configured to allow thermal energy to pass from the thermally conductive element through the second circuit board and to the fourth temperature sensor.

5 . The wearable device of claim 2 , wherein the first and second circuit boards are arranged to be substantially parallel to one another.

6 . The wearable device of claim 1 , wherein said first and second temperature sensors are substantially aligned with one another and wherein said third and fourth temperature sensors are substantially aligned with one another.

7 . The wearable device of claim 1 , wherein said thermally conductive element comprises a metal strip.

8 . The wearable device of claim 7 , wherein said metal strip comprises copper.

9 . The wearable device of claim 1 , wherein said one or more hardware processors are further configured to determine said one or more body temperature values based on:

a third comparison between said one or more signals generated by at least one of the first pair of temperature sensors and said one or more signals generated by at least one of the second pair of temperature sensors.

10 . The wearable device of claim 1 , wherein said one or more hardware processors are further configured to determine said one or more body temperature values based on:

a third comparison between said one or more signals generated by the first temperature sensor and said one or more signals generated by the fourth temperature sensor.

11 . The wearable device of claim 1 , wherein the wearable device comprises a first portion configured to be secured to the user's skin and a second portion configured to removably secure to the first portion, and wherein the one or more hardware processors, the thermally conductive element, the first pair of temperature sensors, and the second pair of temperature sensors are positioned within the second portion of the wearable device.

12 . The wearable device of claim 11 , wherein the first portion comprises a frame and a substrate coupled to the frame, the substrate configured to secure to the user's skin, and wherein the second portion comprises a housing.

13 . The wearable device of claim 12 , wherein the housing comprises a first shell and a second shell, and wherein the first and second shells are permanently secured together.

14 . The wearable device of claim 1 , wherein none of the first temperature sensor, second temperature sensor, third temperature sensor, and fourth temperature sensor contact the user's skin when the wearable device is secured to the user.

15 . A wearable device configured to secure to skin of a user, the wearable device comprising:

a first pair of temperature sensors, said first pair of temperature sensors comprising a first temperature sensor and a second temperature sensor, said first temperature sensor operably positioned to be closer to the user's skin than the second temperature sensor when the wearable device is secured to the user's skin, wherein the first pair of temperature sensors are thermally insulated from one another by an air gap;

a second pair of temperature sensors spaced from said first pair of temperature sensors, said second pair of temperature sensors comprising a third temperature sensor and a fourth temperature sensor, said third temperature sensor operably positioned to be closer to the user's skin than the fourth temperature sensor when the wearable device is secured to the user's skin; and

one or more hardware processors configured to:

receive one or more signals generated by each of said first temperature sensor, second temperature sensor, third temperature sensor, and fourth temperature sensor responsive to thermal energy; and

determine one or more body temperature values of the user based on at least:

a first comparison between said one or more signals generated by said first temperature sensor and said one or more signals generated by said second temperature sensor; and

a second comparison between said one or more signals generated by said third temperature sensor and said one or more signals generated by said fourth temperature sensor.

16 . The wearable device of claim 15 , further comprising a thermally conductive element positioned at least partially between the third and fourth temperature sensors.

17 . The wearable device of claim 16 , wherein:

the wearable device further comprises a first circuit board and a second circuit board, the first and second circuit boards spaced from one another, the first circuit board positioned closer to the skin of the user than the second circuit board when the wearable device is secured to the user's skin;

said first temperature sensor is mounted to the first circuit board and the second temperature sensor is mounted to the second circuit board;

said third temperature sensor is mounted to the first circuit board and spaced from the first temperature sensor;

said fourth temperature sensor is mounted to the second circuit board and spaced from the second temperature sensor;

a distance between the first temperature sensor and the second circuit board at least partially defines said air gap; and

said thermally conductive element is positioned between the third temperature sensor and a portion of the second circuit board that is adjacent to the fourth temperature sensor.

18 . The wearable device of claim 17 , wherein:

said first circuit board comprises a first surface and a second surface;

said second circuit board comprises a first surface and a second surface;

said first surface of the first circuit board faces toward the second surface of the second circuit board;

said first and third temperature sensors are mounted on the first surface of the first circuit board;

said second and fourth temperature sensors are mounted on the first surface of the second circuit board; and

said thermally conductive element is positioned between the third temperature sensor and a portion of the second surface of the second circuit board that is adjacent to the fourth temperature sensor.

19 . The wearable device of claim 18 , wherein said second circuit board comprises at least one opening positioned between the fourth temperature sensor and a portion of said thermally conductive element, said at least one opening configured to allow thermal energy to pass from the thermally conductive element through the second circuit board and to the fourth temperature sensor.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 10, 2025
From: AL-ALI, AMMAR; TELFORT, VALERY G.
To: MASIMO CORPORATION
Reel/Frame 073176/0454 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 3, 2024
From: AMPOSTA, JOEL; SCRUGGS, STEPHEN
To: MASIMO CORPORATION
Reel/Frame 066008/0840 →
Continuity (2)
Provisional Application 63261500 · Sep 22, 2021
Related Publication 20230087671A1 · Mar 23, 2023
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