Temperature measuring device

Abstract

This temperature measurement device comprises a sensor part (1) for measuring the size of the heat flow transferred from a living body (100). This sensor part (1) comprises: a heat resistor (10) that is disposed so as to contact the living body (100); a detection part (18) that is provided to the heat resistor (10) so as to measure the size of the heat flow transferred from the living body (100); and heat resistors (11) that are disposed at the periphery of the heat resistor (10) so as to contact the living body (100).

Description

[Technical field]

[0001] The present invention relates to a temperature measuring device for measuring the internal temperature of a living body non-invasively and with high accuracy. [Background technology]

[0002] Recent research in chronobiology has revealed that the human circadian rhythm, or so-called biological clock, is closely related to various aspects of our bodies, including not only the quality of sleep, exercise, and work, but also the effectiveness of medication and the onset of diseases. Although the circadian rhythm is almost constant, it is known to vary greatly depending on the light we are exposed to in our daily lives, exercise, diet, as well as age and gender.

[0003] Deep body temperature is known as an index for measuring circadian rhythms, but the most common methods for measuring deep body temperature are to insert a thermometer into the rectum or to measure the temperature of the eardrum with the ear sealed, which are very stressful methods for measuring deep body temperature during daily activities or while sleeping.

[0004] On the other hand, a technology has been proposed for non-invasively measuring the deep body temperature of a living body by replacing the heat flow with a one-dimensional equivalent circuit model to estimate the deep body temperature of a living body (see Non-Patent Document 1).

[0005] The method disclosed in Non-Patent Document 1 uses a thermal equivalent circuit model of a living body 100 and a sensor 101 as shown in FIG. cbt The deep body temperature T of the living body 100 is estimated. cbt is the thermal resistance R s When a sensor 101 having the above-mentioned temperature is placed on the skin surface of a living body 100, the temperature T s and the temperature T of the top surface of the sensor 101 opposite to the surface in contact with the living body 100. u Therefore, it can be estimated using equation (1). T cbt =T s +α(T s -T u ) ···(1)

[0006] Or, core temperature T cbt is the heat flux H on the skin surface of the living body 100 s From this, it can be estimated as shown in equation (2). T cbt =T s +αH s (2)

[0007] In equations (1) and (2), α is the thermal resistance R of the living body 100. b The proportionality coefficient α can be calibrated in advance by other measuring means for measuring the eardrum temperature, the rectal temperature, or the like.

[0008] However, the deep body temperature T according to formula (1) and formula (2) cbt In the estimation method of (1), when the outside temperature changes or the living body 100 is exposed to wind, the heat flow is no longer one-dimensional, and the heat that should flow into the sensor 101 flows out to the surroundings, decreasing the magnitude of the heat flow that should be measured, and the deep body temperature T cbt This has the problem of error in estimating the temperature. For this reason, its use has been limited to the limited environment of hospitals, and it may be difficult to apply it to monitoring deep body temperature in daily life.

[0009] Therefore, the inventors cbt In order to reduce the estimation error of the deep body temperature T, a sensor structure that allows for one-dimensional heat flow even if the surrounding environment changes was proposed in Non-Patent Document 1. In this structure, the temperature sensor is covered with a truncated cone or dome-shaped metal member made of aluminum or other material with good thermal conductivity, and the surrounding temperature is increased relative to the center where the temperature sensor is located, thereby reducing the heat flow (loss) to the surroundings. cbt This can reduce the estimation error.

[0010] However, in the case of metals such as aluminum, heat is transferred isotropically. Therefore, in the structure disclosed in Non-Patent Document 1, as shown in FIG. 24, the heat flux H Loss It is not possible to suppress the core temperature Tcbt To further reduce the estimation error of the heat flux H Loss In addition, the structure disclosed in Non-Patent Document 1 requires the fabrication of a complex structure inside the temperature measuring device, which increases manufacturing tolerances and increases costs. [Prior art documents] [Non-patent literature]

[0011] [Non-Patent Document 1] Y. Tanaka, D. Matsunaga, T. Tajima, and M. Seyama, “Robust Skin Attachable Sensor for Core Body Temperature Monitoring”, IEEE SENSORS JOURNAL, VOL. 21, NO. 14, pp. 16118-16123, JULY 15, 2021 Summary of the Invention [Problem to be solved by the invention]

[0012] The present invention has been made to solve the above-mentioned problems, and has an object to provide a temperature measuring device that has a simple structure and is capable of measuring the internal temperature of a living body with high accuracy. [Means for solving the problem]

[0013] The temperature measuring device of the present invention comprises a sensor unit configured to measure the magnitude of a heat flow transmitted from a living body, and a transmitter unit configured to calculate an internal temperature of the living body based on the magnitude of the heat flow measured by the sensor unit, and the sensor unit comprises a first thermal resistor arranged to be in contact with the living body, a detection unit provided on the first thermal resistor to measure the magnitude of the heat flow transmitted from the living body, and a second thermal resistor arranged around the first thermal resistor to be in contact with the living body. The second thermal resistor is disposed so as to be in contact with the first thermal resistor, and the thickness of the first and second thermal resistors is 3 mm, and the outer diameter of the second thermal resistor is the diameter of the sensor portion is 30 mm or more, or the diameter of the sensor portion is 30 mm, and the thickness of the first and second thermal resistors is 3 mm or less. It is characterized by the above. Effect of the Invention

[0014] According to the present invention, by providing a second thermal resistor around the first thermal resistor, the distortion of the temperature field in the living body can be alleviated and the heat flux deviating from the center where the sensor part is located can be suppressed, so that the internal temperature of the living body can be measured with high accuracy. Also, in the present invention, the sensor part can have a simple structure compared to the conventional technology in which the temperature sensor is covered with a metal member. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view of a sensor portion of a temperature measuring device according to the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing another configuration of the sensor unit of the temperature measuring device according to the present invention. [Diagram 3] FIG. 3 is a cross-sectional view of a sensor portion of the temperature measuring device according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a block diagram showing the configuration of an electronic circuit section of the temperature measuring device according to the first embodiment of the present invention. [Diagram 5] FIG. 5 is an external view of the temperature measuring device according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a flowchart illustrating the operation of the temperature measuring device according to the first embodiment of the present invention. [Figure 7] FIG. 7 is a diagram showing the relationship between the radius of the sensor unit and the estimation error of the core body temperature according to the first embodiment of the present invention. [Figure 8] FIG. 8 is a diagram showing the relationship between the thickness of the thermal resistor in the sensor unit and the estimation error of the core body temperature according to the first embodiment of the present invention. [Figure 9] FIG. 9 is a graph showing the deep body temperature estimated by the temperature measuring device according to the first embodiment of the present invention and the tympanic membrane temperature measured by a tympanic membrane thermometer. [Figure 10] FIG. 10 is a cross-sectional view of a sensor portion of a temperature measuring device according to a second embodiment of the present invention. [Figure 11] FIG. 11 is an external view of a temperature measuring device according to a second embodiment of the present invention. [Figure 12] FIG. 12 is a diagram showing the relationship between the radius of the sensor unit and the estimation error of the core body temperature according to the second embodiment of the present invention. [Figure 13] FIG. 13 is a diagram showing the relationship between the gap width of the sensor unit and the estimation error of the core body temperature according to the second embodiment of the present invention. [Figure 14] FIG. 14 is an external view of a temperature measuring device according to a second embodiment of the present invention. [Figures 15A-15C] 15A to 15C are plan views and cross-sectional views showing a specific example of a temperature measuring device according to a second embodiment of the present invention. [Figure 16] FIG. 16 is a cross-sectional view of a sensor portion of a temperature measuring device according to a third embodiment of the present invention. [Figure 17] FIG. 17 is an external view of a sensor unit of a temperature measuring device according to a fourth embodiment of the present invention. [Figure 18] FIG. 18 is a cross-sectional view of a sensor portion of a temperature measuring device according to a fourth embodiment of the present invention. [Figure 19] FIG. 19 is a diagram showing the configuration of a temperature measuring device according to a fifth embodiment of the present invention. [Figure 20] FIG. 20 is a cross-sectional view of a sensor portion of a temperature measuring device according to a sixth embodiment of the present invention. [Figure 21] FIG. 21 is a flowchart illustrating the operation of the temperature measuring device according to the sixth embodiment of the present invention. [Figure 22] FIG. 22 is a block diagram showing an example of the configuration of a computer that realizes the temperature measuring device according to the first to sixth embodiments of the present invention. [Diagram 23] FIG. 23 is a diagram showing a thermal equivalent circuit model of a living body and a sensor. [Figure 24] FIG. 24 is a diagram for explaining the problems with the conventional temperature measuring device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] [Principle of the invention] In a temperature measurement device that measures the deep body temperature of a living organism, it is necessary to smooth the temperature field inside the organism and make the heat flow one-dimensional, as assumed in the thermal equivalent circuit model shown in Figure 23.

[0017] The thermal resistor that holds the sensor that measures the temperature and heat flux of the skin surface of a living body can have a thermal conductivity of about 0.05 to 0.5 W / (m·K). In the literature "Ming Huang, Toshiyo Tamura, Wenxi Chen, Shigehi koKanaya, "Evaluation of structural and thermophysical effects on the measurement-ment accuracy of deep body thermometers based on dual-heat-flux method", Journal of Thermal Biology, 47, pp.26-31, 2015", a dual-heat-flux method is described that estimates the deep body temperature of a living body by measuring the heat flux at two points. In this dual-heat-flux method, multiple thermal resistors with different thermal conductivities must be used, so the thermal conductivities of the multiple thermal resistors are never the same as the thermal conductivity of the living body (0.2 to 0.6 W / (m·K)). As a result, the temperature field is distorted at the point of contact of the sensor with the living body, and a two-dimensional heat flow occurs as shown in Figure 24, resulting in heat loss.

[0018] Therefore, in the present invention, as shown in Fig. 1, a heat flow smoothing heat resistor 11 having a thermal conductivity equivalent to that of the heat resistor 10 or an intermediate thermal conductivity between the heat resistor 10 and the living body 100 is provided around the heat flow measuring heat resistor 10 so as to be in contact with the heat resistor 10. This makes it possible to reduce the distortion of the temperature field in the living body 100 in the present invention.

[0019] In addition, in the present invention, a small gap 12 is provided between the thermal resistors 10 and 11 as shown in Fig. 2. The gap 12 is filled with a material with a very low thermal conductivity (<0.02 W / m / K), such as air. This makes it possible to suppress distortion of the temperature field in the living body 100 while suppressing heat loss in the sensor unit.

[0020] [First Example] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 3 is a cross-sectional view of a sensor part of a temperature measuring device according to a first embodiment of the present invention, Fig. 4 is a block diagram showing the configuration of an electronic circuit part of the temperature measuring device, and Fig. 5 is an external view of the temperature measuring device.

[0021] The temperature measuring device 102 of this embodiment includes a sensor unit 1 for measuring the magnitude of heat flow transmitted from a living body 100, and a deep body temperature T of the living body 100 based on the magnitude of the measured heat flow. cbt The transmitter unit 2 calculates the internal temperature.

[0022] The sensor unit 1 includes a cylindrical thermal resistor 10 arranged so as to be in contact with the living body 100, a ring-shaped thermal resistor 11 arranged around the thermal resistor 10 so as to be in contact with the thermal resistor 10 and the living body 100, and a surface of the thermal resistor 10 facing the living body 100 that detects the temperature T s The temperature sensor 13 measures the temperature T u The temperature sensors 13 and 14 constitute a detection unit 18 that measures the magnitude of the heat flow transmitted from the living body 100.

[0023] The transmitter unit 2 includes a memory unit 20 for storing data, and a deep body temperature T cbt A calculation unit 21 for calculating the deep body temperature T cbt The computer includes a communication unit 22 that transmits the data to an external terminal, a control unit 23 that controls reading and writing of data to the memory unit 20 and communication, and a power supply unit 24 that supplies power to the memory unit 20, the calculation unit 21, the communication unit 22, and the control unit 23.

[0024] The sensor unit 1 is attached so that the thermal resistors 10, 11 are in contact with the skin of the living body 100. As the temperature sensors 13, 14, for example, a thermistor, a thermocouple, a platinum resistor, an IC (Integrated Circuit) temperature sensor, or the like can be used.

[0025] The thermal resistor 10 holds the temperature sensors 13 and 14 and acts as a resistor against heat flowing into the temperature sensors 13 and 14. The temperature sensor 14 is disposed directly above the temperature sensor 13. If the distance between the temperature sensors 13 and 14 changes during measurement, the proportionality coefficient α changes, and the deep body temperature T cbt Since an error occurs in the estimation of the temperature, the temperature sensors 13 and 14 are supported by a thermal resistor 10.

[0026] The material of the thermal resistor 10 is preferably a material with a thermal conductivity similar to that of the living body 100 (0.2 to 0.6 W / (m·K)). The material of the thermal resistor 11 for smoothing the heat flow to smooth the temperature field inside the living body may be a material with a thermal conductivity equivalent to that of the thermal resistor 10, or a material with a thermal conductivity intermediate between that of the thermal resistor 10 and the living body 100. The materials of these thermal resistors 10 and 11 may be various resins including silicone-based resins.

[0027] The temperature sensors 13 and 14 are connected to the transmitter unit 2 by a wire 3. FIG. 6 is a flow chart for explaining the operation of the temperature measuring device 102 of this embodiment. The temperature sensor 13 detects the temperature T s The temperature sensor 14 measures the internal temperature T u The measurement data of the temperature sensors 13 and 14 is temporarily stored in the storage unit 20.

[0028] The proportionality coefficient α is stored in advance in the storage unit 20. The calculation unit 21 calculates the temperature T s ,T u Based on and the proportionality coefficient α, the deep body temperature T cbt is calculated, for example, by equation (1) (step S101 in FIG. 6).

[0029] The communication unit 22 detects the deep body temperature T cbtThe data is transmitted to an external terminal such as a PC (Personal Computer) or a smartphone (FIG. 6, step S102). cbt Display the value of .

[0030] The temperature measuring device 102 performs the above-mentioned processes of steps S100 to S102 at regular time intervals, for example, until an instruction to end the measurement is received from the user (YES in step S103 in FIG. 6).

[0031] In this embodiment, the diameter of the sensor part 1 (the outer diameter of the thermal resistor 11) is d, and the thickness of the thermal resistors 10 and 11 is t. The radius d / 2 of the sensor part 1 and the deep body temperature T cbt The relationship between the thickness t of the thermal resistors 10 and 11 and the deep body temperature T cbt The relationship between the estimation error and the core body temperature T is shown in Fig. 8. In Fig. 7, the thickness t of the thermal resistors 10 and 11 is set to 3 mm, and in Fig. 8, the diameter d of the sensor part 1 is set to 30 mm. cbt The estimation error is the difference between the eardrum temperature measured by the eardrum thermometer or the rectal temperature measured by the rectal thermometer and the deep body temperature T estimated by the temperature measuring device 102 of this embodiment. cbt This is the difference between...

[0032] Polydimethylsiloxane is used as the material of the thermal resistors 10 and 11. According to FIG. 7, when the thickness t of the thermal resistors 10 and 11 is 3 mm, if the diameter d of the sensor part 1 is 30 mm or more, the deep body temperature T cbt It can be seen that the deep body temperature T can be estimated with an error of about 0.1°C. Also, according to FIG. 8, when the diameter d of the sensor part 1 is 30 mm and the thickness t of the thermal resistors 10 and 11 is 3 mm or less, the deep body temperature T cbt It can be seen that it is possible to estimate with an error of about 0.1°C.

[0033] FIG. 9 shows a deep body temperature T estimated by attaching the temperature measuring device 102 of this embodiment to the forehead of a living body 100. cbt For comparison, the deep body temperature (tympanic membrane temperature) T measured by a tympanic membrane thermometer e9 shows the results for different living bodies 100. According to FIG. 9, the eardrum temperature T e It can be seen that the present embodiment provides an estimation result close to the above.

[0034] [Second Example] Fig. 10 is a cross-sectional view of a sensor unit of a temperature measuring device according to a second embodiment of the present invention, and Fig. 11 is an external view of the temperature measuring device. Temperature measuring device 102a of this embodiment is composed of a sensor unit 1a and a transmitter unit 2. The configuration of transmitter unit 2 is as described in the first embodiment.

[0035] The sensor section 1a is composed of a cylindrical thermal resistor 10 arranged so as to be in contact with the living body 100, a circular-ring-shaped thermal resistor 11 arranged around the thermal resistor 10 so as to be in contact with the living body 100 and spaced apart from the thermal resistor 10, and temperature sensors 13 and 14.

[0036] In this embodiment, a gap 12 is provided between the thermal resistors 10 and 11 to prevent the heat flux flowing from the living body 100 into the thermal resistor 10 from flowing out to the thermal resistor 11. The inside of the gap 12 is filled with a material having a thermal conductivity (<0.02 W / m / K) lower than that of the living body 100. One such material is air. Alternatively, the inside of the gap 12 may be filled with reduced-pressure air to provide a structure that is isolated from the outside air.

[0037] In this embodiment, the diameter of the thermal resistor 10 is D, the diameter of the sensor part 1a (the outer diameter of the thermal resistor 11) is d, the thickness of the thermal resistors 10 and 11 is t, and the width of the gap 12 is b. cbt The relationship between the estimated error and the thermal resistance is shown by a solid line 120 in Fig. 12. Here, silicone resin is used as the material of the thermal resistors 10 and 11, the diameter D of the thermal resistor 10 is 8 mm, the thickness t of the thermal resistors 10 and 11 is 3 mm, and the width b of the gap 12 is 0.5 mm.

[0038] For comparison, the diameter D of the thermal resistor 10 is set to 14 mm, and the gap 12 is eliminated. The radius d / 2 of the sensor part 1a and the deep body temperature T cbt The relationship between the estimated temperature T and the estimated error is shown by a broken line 121. According to FIG. 12, by providing the gap 12, even if the diameter of the sensor unit 1a is small, the deep body temperature T cbt It can be seen that the estimation error can be reduced.

[0039] The width b of the gap 12 and the deep body temperature T in an environment where the wind speed is about 5 m / s cbt The relationship between the estimated temperature and the estimated error is shown in Fig. 13. Here, silicone resin is used as the material for the thermal resistors 10 and 11, the diameter D of the thermal resistor 10 is 8 mm, the thickness t of the thermal resistors 10 and 11 is 3 mm, and the diameter d of the sensor part 1a is 30 mm. According to Fig. 13, by providing a gap 12 with a width of several mm, the deep body temperature T cbt It can be seen that the estimation error can be suppressed to less than about 0.1°C.

[0040] 5 and 11, the outer shape of the sensor units 1 and 1a is circular, but it may be rectangular as shown in FIG.

[0041] Fig. 15A is a plan view showing a specific example of temperature measuring device 102a of this embodiment, Fig. 15B is a cross-sectional view of temperature measuring device 102a, and Fig. 15C is a plan view of a board on which temperature sensors 13 and 14 are mounted. Temperature measuring device 102a includes housing 30 with a thickness of about 1 mm and made of the same silicone resin as thermal resistors 10 and 11, battery 31 housed in housing 30, battery holder 32 for holding battery 31, knob 33 for pulling out battery holder 32, power switch 34 for turning the power on and off, lamp 35 for checking whether the power is on or off, and lamp 36 for checking the operating state.

[0042] The sensor unit 1a and the transmitter unit 2 are housed in the housing 30. In the examples of Fig. 5, Fig. 11 and Fig. 14, the temperature sensors 13, 14 of the sensor units 1, 1a are connected to the transmitter unit 2 by wiring 3, but in the examples of Fig. 15A to Fig. 15C, the temperature sensors 13, 14 are provided on a flexible substrate 37. The temperature sensors 13, 14 are electrically connected to the transmitter unit 2 via a connector 38 provided on the substrate 37.

[0043] When fabricating the temperature measuring device 102a, as shown in FIG. 15B, the substrate 37 is bent to sandwich the thermal resistor 10 so that the temperature sensor 13 is placed on the bottom surface of the thermal resistor 10 and the temperature sensor 14 is placed on the top surface of the thermal resistor 10.

[0044] [Third Example] 16 is a cross-sectional view of a sensor unit of a temperature measuring device according to a third embodiment of the present invention. The sensor unit 1b of this embodiment is composed of a thermal resistor 10 arranged so as to be in contact with a living body 100, a thermal resistor 11 arranged around the thermal resistor 10 so as to be in contact with the living body 100 and spaced apart from the thermal resistor 10, temperature sensors 13 and 14 held by the thermal resistor 10, and connecting members 15 and 16 connecting the thermal resistor 10 and the thermal resistor 11.

[0045] In this embodiment, the upper surfaces of the thermal resistors 10 and 11 are connected by a connecting member 15, and the lower surfaces of the thermal resistors 10 and 11 are connected by a connecting member 16. The connecting members 15 and 16 may be made of the same material as the thermal resistors 10 and 11. The thickness of the connecting members 15 and 16 is preferably 1 mm or less.

[0046] FIG. 16 shows an example in which the connecting members 15 and 16 are applied to the second embodiment, but they may also be applied to the first embodiment.

[0047] [Fourth Example] Fig. 17 is an external view of a sensor unit of a temperature measuring device according to a fourth embodiment of the present invention, and Fig. 18 is a cross-sectional view of the sensor unit. The sensor unit 1c of this embodiment is provided with a plurality of temperature sensors 13, 14 and thermal resistors 10 to accommodate the dual heat flow method. The plurality of thermal resistors 10 are arranged in the thermal resistor 11 so as to be spaced apart from each other. This embodiment may be applied to the first embodiment.

[0048] [Fifth Example] 19 is a diagram showing the configuration of a temperature measuring device according to a fifth embodiment of the present invention. A temperature measuring device 102d of this embodiment employs an integrated structure in which a transmitter unit 2 is provided on a sensor unit 1b.

[0049] [Sixth Example] 20 is a cross-sectional view of a sensor unit of a temperature measuring device according to a sixth embodiment of the present invention. In the sensor unit 1e of this embodiment, a heat flux sensor 17 is provided on the surface of the thermal resistor 10 facing the living body 100, instead of the temperature sensor 14. The temperature sensor 13 and the heat flux sensor 17 constitute a detection unit 18a that measures the magnitude of the heat flow transmitted from the living body 100. The other configuration of the sensor unit 1e is the same as that of the sensor unit 1a. The configuration of the transmitter unit 2 is the same as that of the first to fifth embodiments.

[0050] 21 is a flow chart for explaining the operation of the temperature measuring device of this embodiment. The temperature sensor 13 detects the temperature T s is measured (FIG. 21, Step S100a). The heat flux sensor 17 detects the heat flux H s (Step S104 in FIG. 21). The measurement data of the temperature sensor 13 and the heat flux sensor 17 are temporarily stored in the memory unit 20 of the transmitter unit 2.

[0051] The proportionality coefficient α is stored in advance in the storage unit 20. The calculation unit 21 of the transmitter unit 2 calculates the temperature T s and heat flux H s Based on and the proportionality coefficient α, the deep body temperature T cbtis calculated, for example, by equation (2) (FIG. 21, step S101a). The communication unit 22 detects the deep body temperature T cbt The data is transmitted to the external terminal (FIG. 21, step S102).

[0052] The temperature measuring device performs the processes of steps S100a, S104, S101a, and S102 at regular time intervals, for example, until an instruction to end the measurement is received from the user (YES in step S103 in FIG. 21).

[0053] FIG. 20 shows an example in which the heat flux sensor 17 is applied to the second embodiment, but it goes without saying that the heat flux sensor 17 may be applied to the first and third to fifth embodiments.

[0054] The storage unit 20, the calculation unit 21, the communication unit 22, and the control unit 23 described in the first to sixth embodiments can be realized by a computer equipped with a CPU (Central Processing Unit), a storage device, and an interface, and a program that controls these hardware resources. An example of the configuration of this computer is shown in FIG.

[0055] The computer includes a CPU 200, a storage device 201, and an interface device (I / F) 202. Hardware such as temperature sensors 13 and 14, heat flux sensor 17, and communication unit 22 are connected to the I / F 202. In such a computer, a program for implementing the temperature measurement method of the present invention is stored in the storage device 201. The CPU 200 executes the processes described in the first to sixth embodiments in accordance with the program stored in the storage device 201. [Industrial Applicability]

[0056] The present invention can be applied to a technique for non-invasively measuring the internal temperature of a living body. [Explanation of symbols]

[0057] 1, 1a, 1b, 1c, 1e...sensor section, 2...transmitter section, 3...wiring, 10, 11...thermal resistor, 12...gap, 13, 14...temperature sensor, 15, 16...connecting member, 17...heat flux sensor, 18, 18a...detection section, 20...memory section, 21...calculation section, 22...communication section, 23...control section, 24...power supply section, 30...housing, 31...battery, 32...battery holder, 33...knob, 34...power switch, 35, 36...lamp, 37...board, 38...connector, 102, 102a, 102d...temperature measuring device.

Claims

1. A sensor unit configured to measure the magnitude of a heat flux transmitted from a living body, and a transmitter unit configured to calculate the internal temperature of the living body based on the magnitude of the heat flux measured by the sensor unit, wherein the sensor unit comprises a first heat resistor arranged to be in contact with the living body, a detection unit provided on the first heat resistor to measure the magnitude of the heat flux transmitted from the living body, and a second heat resistor arranged to be in contact with the living body around the first heat resistor, wherein the second heat resistor is arranged to be in contact with the first heat resistor, and the temperature measurement device is characterized in that the diameter of the sensor unit, which is the outer diameter of the second heat resistor and the thicknesses of the first and second heat resistors are 3 mm, is 30 mm or more, or the diameter of the sensor unit is 30 mm and the thicknesses of the first and second heat resistors are 3 mm or less.

2. The temperature measurement device according to claim 1, wherein the sensor unit further comprises a connecting member that connects the first heat resistor and the second heat resistor.

3. The temperature measurement device according to claim 1 or 2, wherein the sensor unit comprises a plurality of the first heat resistors and the detection units.

4. The temperature measurement device according to any one of claims 1 to 3, wherein the transmitter unit is provided on the sensor unit.

5. The temperature measurement device according to any one of claims 1 to 4, wherein the detection unit comprises a first temperature sensor provided on the surface of the first heat resistor facing the living body and configured to measure the temperature of the surface of the living body, and a second temperature sensor configured to measure the temperature inside the first heat resistor directly above the first temperature sensor, and the transmitter unit calculates the internal temperature of the living body based on the measurement results of the first and second temperature sensors.

6. The temperature measurement device according to any one of claims 1 to 4, wherein the detection unit comprises a temperature sensor provided on the surface of the first heat resistor facing the living body and configured to measure the temperature of the surface of the living body, and a heat flux sensor provided on the surface of the first heat resistor facing the living body and configured to measure the heat flux flowing from the living body into the sensor unit. The temperature measuring device is characterized in that the transmitter unit calculates the internal temperature of the living body based on the measurement results of the temperature sensor and the heat flux sensor.

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