US 11,883,133 B2
Internal body temperature measurement device and internal body temperature measurement method
Daichi Matsunaga, Tokyo (JP); Yujiro Tanaka, Tokyo (JP); and Michiko Seyama, Tokyo (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 17/252,821
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Jun. 6, 2019, PCT No. PCT/JP2019/022568
§ 371(c)(1), (2) Date Dec. 16, 2020,
PCT Pub. No. WO2020/003960, PCT Pub. Date Jan. 2, 2020.
Claims priority of application No. 2018-121861 (JP), filed on Jun. 27, 2018.
Prior Publication US 2021/0186337 A1, Jun. 24, 2021
Int. Cl. A61B 5/01 (2006.01)
CPC A61B 5/01 (2013.01) [A61B 2562/0271 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An in-vivo temperature measurement device comprising:
a plurality of thermal resistors;
a plurality of first temperature sensors at a first end of the plurality of thermal resistors configured to face a living body;
a plurality of second temperature sensors provided at a second end of the plurality of thermal resistors opposite to the first end;
a memory configured to store an estimation model of a core temperature of the living body according to a non-thermal equilibrium state of the living body and thermal resistance values of the plurality of thermal resistors; and
an arithmetic circuit configured to estimate the core temperature of the living body based on the estimation model, the thermal resistance values, and a plurality of temperatures measured by the plurality of first temperature sensors and the plurality of second temperature sensors;
wherein the first temperature sensors are configured to measure a first temperature indicating an epidermis temperature of the living body;
wherein the second temperature sensors are configured to measure a second temperature at a position away from the living body;
wherein the thermal resistance values of the plurality of thermal resistors are different from one another; and
wherein the estimation model is represented by a following expression:

OG Complex Work Unit Math
wherein Tc indicates the core temperature at a measurement time t, RSi (i=1, 2, 3) indicates a corresponding thermal resistance value of each of the plurality of thermal resistors, TSi (i=1, 2, 3) indicates a corresponding first temperature measured by each of the plurality of first temperature sensors, Ti, =(TSi(t)-TUi(t)), TUi (i=1, 2, 3) indicates a corresponding second temperature measured by each of the plurality of second temperature sensors, and TSi′=dTSi(t)/dt.