US 11,883,133 B2Granted

Internal body temperature measurement device and internal body temperature measurement method

AssigneeNippon Telegraph and Telephone Corporation

InventorsDaichi Matsunaga, Yujiro Tanaka, Michiko Seyama

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Abstract

An in-vivo temperature measurement device includes a plurality of thermal resistors, temperature sensors for measuring an epidermis temperature of a living body, and temperature sensors for measuring an upper surface temperature that are provided at both ends of the thermal resistors, respectively, a memory that stores an estimation model of the core temperature of the living body that takes into consideration a non-thermal equilibrium state of the living body, and thermal resistance values of the thermal resistors, and an arithmetic circuit that estimates, based on the plurality of temperatures measured by the temperature sensors and the temperature sensors, the core temperature of the living body using the estimation model and the thermal resistance values, and the thermal resistance values are different from one another.

Claims10

Dependent claims

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:
T
C
=
T
1
⁡
(
T
S
⁢
⁢
2
′
⁢
T
S
⁢
⁢
3
-
T
S
⁢
⁢
3
′
⁢
T
S
⁢
⁢
2
)
+
R
S
⁢
⁢
1
R
S
⁢
⁢
2
⁢
T
2
⁡
(
T
S
⁢
⁢
3
′
⁢
T
S
⁢
⁢
1
-
T
S
⁢
⁢
1
′
⁢
T
S
⁢
⁢
3
)
+
R
S
⁢
⁢
1
R
S
⁢
⁢
3
⁢
T
3
⁡
(
T
S
⁢
⁢
1
′
⁢
T
S
⁢
⁢
2
-
T
S
⁢
⁢
2
′
⁢
T
S
⁢
⁢
1
)
T
1
⁡
(
T
S
⁢
⁢
2
′
-
T
S
⁢
⁢
3
′
)
+
R
S
⁢
⁢
1
R
S
⁢
⁢
2
⁢
T
2
⁡
(
T
S
⁢
⁢
3
′
-
T
S
⁢
⁢
1
′
)
+
R
S
⁢
⁢
1
R
S
⁢
⁢
3
⁢
T
3
⁡
(
T
S
⁢
⁢
1
′
-
T
S
⁢
⁢
2
′
)
,
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.

205 more elements

An in-vivo temperature measurement method comprising:

measuring a plurality of temperatures with first temperature sensors and second temperature sensors, wherein the first temperature sensors are provided at a first end of a plurality of thermal resistors, wherein the second temperature sensors are provided at a second end of the plurality of thermal resistors opposite to the first end, and wherein the first temperature sensors are positioned facing a living body;
and
estimating, using an estimation model of a core temperature based on a non-thermal equilibrium state of the living body and thermal resistance values of the thermal resistors, the core temperature of the living body based on the plurality of temperatures;
wherein the first temperature sensors measure a first temperature indicating an epidermis temperature of the living body;
wherein the second temperature sensors 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:
T
C
=
T
1
⁡
(
T
S
⁢
⁢
2
′
⁢
T
S
⁢
⁢
3
-
T
S
⁢
⁢
3
′
⁢
T
S
⁢
⁢
2
)
+
R
S
⁢
⁢
1
R
S
⁢
⁢
2
⁢
T
2
⁡
(
T
S
⁢
⁢
3
′
⁢
T
S
⁢
⁢
1
-
T
S
⁢
⁢
1
′
⁢
T
S
⁢
⁢
3
)
+
R
S
⁢
⁢
1
R
S
⁢
⁢
3
⁢
T
3
⁡
(
T
S
⁢
⁢
1
′
⁢
T
S
⁢
⁢
2
-
T
S
⁢
⁢
2
′
⁢
T
S
⁢
⁢
1
)
T
1
⁡
(
T
S
⁢
⁢
2
′
-
T
S
⁢
⁢
3
′
)
+
R
S
⁢
⁢
1
R
S
⁢
⁢
2
⁢
T
2
⁡
(
T
S
⁢
⁢
3
′
-
T
S
⁢
⁢
1
′
)
+
R
S
⁢
⁢
1
R
S
⁢
⁢
3
⁢
T
3
⁡
(
T
S
⁢
⁢
1
′
-
T
S
⁢
⁢
2
′
)
,
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 first temperature sensors, Ti, =(TSi(t)-TUi(t)), TUi (i=1, 2, 3) indicates a corresponding second temperature measured by each of the second temperature sensors, and TSi′=dTSi(t)/dt.

202 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/252,821Filed 6 Jun 2019
Priority: JP 2018-12186127 Jun 2018
Published: US 2021/0186337 A124 Jun 2021
Granted: 30 Jan 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

A61B 5/01
Measuring for diagnostic purposes ; Identification of persons: measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for…
G01K 1/143
Supports; Fastening devices; Arrangements for mounting thermometers in particular locations: for measuring surface temperatures
G01K 7/00
Measuring temperature based on the use of electric or magnetic elements directly
G01K 13/20
Thermometers specially adapted for specific purposes: clinical contact thermometers for use with humans or animals