US 12,426,839 B2
Method for estimating core body temperature
Mark Jonathan Buller, Douglas, MA (US); and David Patrick Looney, Framingham, MA (US)
Assigned to The Government of the United States, as represented by the Secretary of the Army, Ft. Detrick, MD (US)
Appl. No. 17/428,525
Filed by The Government of the United States, as Represented by the Secretary of the Army, Fort Detrick, MD (US)
PCT Filed Feb. 7, 2020, PCT No. PCT/US2020/017136
§ 371(c)(1), (2) Date Aug. 4, 2021,
PCT Pub. No. WO2020/180454, PCT Pub. Date Sep. 10, 2020.
Claims priority of provisional application 62/802,373, filed on Feb. 7, 2019.
Prior Publication US 2022/0125388 A1, Apr. 28, 2022
Int. Cl. A61B 5/00 (2006.01); A61B 5/0205 (2006.01); A61B 5/024 (2006.01); G16H 10/60 (2018.01); G16H 50/30 (2018.01)
CPC A61B 5/7278 (2013.01) [A61B 5/0008 (2013.01); A61B 5/02055 (2013.01); A61B 5/024 (2013.01); A61B 5/7225 (2013.01); A61B 5/7275 (2013.01); A61B 5/742 (2013.01); A61B 5/746 (2013.01); G16H 10/60 (2018.01); G16H 50/30 (2018.01)] 20 Claims
OG exemplary drawing
 
1. A method for indirectly predicting a core body temperature of a person in substantially real-time to allow the person to act on the core body temperature to avoid a heat illness, the method comprising:
setting an initial core body temperature with a mobile device comprising a heart rate monitor, a processor, and a display;
receiving at least two heart rates of the person with the processor, where the heart rates are detected by the heart rate monitor attached to the person, wherein the at least two heart rates include a first heart rate and a second heart rate;
calculating the core body temperature with the processor using an extended Kalman filter based on a sigmoid model using solely the second heart rate and the initial core body temperature;
providing the core body temperature to the display and/or an external device; and,
using the provided core body temperature by the person to adjust an activity level in real-time when the core body temperature indicates there is an elevated risk of suffering from heat illness, and
wherein the initial core body temperature is set by the processor
based solely on the first heart rate of the person or
on a predetermined resting core body temperature for that person; and
the sigmoid model uses an error between the measured heart rate and an estimated heart rate based on the estimated core body temperature to adjust the sigmoid model.