JP2012073128A - Clinical thermometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance measurement accuracy and improve a wearing property in a non-heating type clinical thermometer.SOLUTION: A clinical thermometer 400 measures a deep body temperature through making contact with a body surface of a subject being tested. The clinical thermometer 400 comprises: first and second heat resistors 113 and 123 having first temperature sensors 111 and 121 on a side to have contact with the body surface and second temperature sensors 112 and 122 on a side opposite to the side to have contact with the body surface, respectively installed; an equalizing member 130 configured to cover only the side opposite to the side to have contact with the body surface of the first and second heat resistors 113 and 123; and an insulation member 401 formed to surround side faces of the first and second heat resistor 113 and 123.

Description

  The present invention relates to a thermometer.

  Conventionally, a non-heated thermometer is known as a thermometer that is attached to the body surface of a subject and measures the body temperature in the deep part of the subject (see, for example, Patent Documents 1 and 2).

  In general, a non-heating type thermometer is disposed so as to face a first temperature sensor that comes into contact with a body surface when the sample is attached to the body surface of a subject, and the first temperature sensor via a heat insulating material. At least two temperature sensor pairs each including a second temperature sensor, and the respective heat insulating materials on which the temperature sensor pairs are arranged have different thicknesses. By using the temperature difference between the temperature sensor and the second temperature sensor, the heat flow from the deep part is obtained and the body temperature of the deep part is calculated.

JP 2007-212407 A JP 2009-222543 A

  However, a non-heating type thermometer has a large measurement error, and it is difficult to measure a deep body temperature with high accuracy. For this reason, in practical use, it is considered essential to individually examine factors that affect measurement accuracy and to take measures to eliminate those factors. In addition, since the size of the portion to be attached to the body surface is large and a certain amount of thickness is required, the thermometer itself lacks flexibility, and there is a problem with respect to wearability, such as being in the way of wearing.

  The present invention has been made in view of the above problems, and is intended to improve measurement accuracy and wearability in a non-heating type thermometer that is attached to the body surface of a subject and measures the body temperature in the deep part of the subject. For the purpose.

In order to achieve the above object, the thermometer according to the present invention has the following configuration. That is,
A thermometer that measures deep body temperature by contacting the body surface of a subject,
First and second thermal resistances in which a first temperature sensor is disposed on the side in contact with the body surface, and a second temperature sensor is disposed on a side opposite to the surface on the side in contact with the body surface. Body,
A uniformizing member configured to cover only the surface of the first and second thermal resistors that faces the surface that contacts the body surface;
And a heat insulating member disposed so as to surround side surfaces of the first and second thermal resistors.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve a measurement precision in the non-heating-type thermometer which affixes on the body surface of a subject and measures the body temperature of the deep part of a subject. Moreover, it becomes possible to affix the whole thermometer so that it may contact | adhere to the body surface which is not necessarily flat, and a mounting property improves.

In order to explain the measurement principle of a non-heating type thermometer, the heat flow in the non-heating type thermometer is expressed as an electric circuit using an electric circuit similarity method. It is a figure which shows the simulation result of a measurement error. It is a conceptual diagram which shows the factor of a measurement error. It is a figure which shows the cross-sectional structure of a non-heating type thermometer. It is a figure which shows the cross-sectional structure of a non-heating type thermometer. It is a figure which shows the planar structure of a non-heating type thermometer. It is a figure which shows the planar structure of a non-heating type thermometer. It is a figure which shows the external appearance structure of a body temperature measurement system provided with the non-heating-type thermometer and the body temperature display apparatus which can communicate with this non-heating-type thermometer. It is a figure which shows the function structure of a non-heating-type thermometer provided with an antenna and a process part. It is a figure which shows the function structure of a body temperature display apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
1. Principle of measuring deep body temperature with a non-heated thermometer First, a non-heated thermometer (a thermometer that is attached to the body surface of a subject and measures the deep body temperature of the subject and does not have a heating function) The measurement principle of deep body temperature in a thermometer) will be briefly described.

  FIG. 1 is a diagram showing the heat flow in an unheated thermometer as an electric circuit using an electric circuit similarity method in order to explain the measurement principle of the non-heated thermometer.

  As shown in FIG. 1, the heat flow in the non-heated thermometer can be expressed by an equivalent circuit 100 by setting the heat flow as the current I, the temperature as the voltage T, and the heat resistance as the electric resistance R.

  In FIG. 1, Tb is the deep body temperature, Rt is the thermal resistance of the subcutaneous tissue of the subject, Tt1 is the temperature detected by the first temperature sensor 111, and Ta1 is the temperature detected by the second temperature sensor 112. Ra1 indicates the thermal resistance value of the thermal resistor 113, respectively. Tt2 represents the temperature detected by the first temperature sensor 121, Ta2 represents the temperature detected by the second temperature sensor 122, and Ra2 represents the thermal resistance value of the thermal resistor 123. Further, Tc represents an external temperature, and Rc represents a thermal resistance value between the homogenizing member 130 and the outside for equalizing the measured temperature on the outside air side.

  Since the equivalent circuit 100 can be replaced with one to which a voltage (Tb−Tc) is applied, it can be assumed that the current I flows in the equivalent circuit 100 according to the voltage.

  Of these, assuming that the heat flow in the thermal resistor 113 is current I1, and the heat flow in the thermal resistor 123 is current I2, the current I1 and the current I2 can be expressed by the following equations (1) and (2).

  Then, when the respective equations are modified, the following equations (3) and (4) are obtained.

  Here, the thermal resistance Rt of the subcutaneous tissue varies from individual to individual and from site to site, and is not constant. Therefore, when Rt is calculated to remove Rt from the above equations (3) and (4), the following equation (5) is obtained.

  Then, by substituting the above equation (5) into the above equation (4), the following equation (6) is obtained.

  Here, since Ra1 and Ra2 are known, the depth body temperature Tb can be uniquely determined by detecting four temperatures (Tt1, Tt2, Ta1, Ta2).

2. Simulation on Measurement Error in Thermometer Next, a simulation of a measurement error in a non-heating type thermometer that measures the deep body temperature based on the above-described measurement principle will be described. In examining the measurement error in the non-heated thermometer, the applicant of the present application pays attention to the shape (diameter and thickness) of the thermometer, and the measurement error when the shape (diameter and thickness) of the thermometer is changed variously. A simulation was performed.

  In FIG. 2, polyacetal (POM) having a thermal conductivity of 0.25 [W / mk] is used as the material of the thermal resistors 113 and 123, and as a uniformizing member 130 for uniformizing the measurement temperature on the outside air side. The simulation result of the measurement error by the difference in the shape (diameter and thickness) of each thermal resistor 113, 123 when using aluminum with a thermal conductivity of 236 [W / mk] is shown.

  In FIG. 2, when 201 is the thickness of the thermal resistor 113 and the thickness of the thermal resistor 123 is 20 mm, the diameter of each of the thermal resistors 113 and 123 is changed between 10 mm and 30 mm. It is the graph which showed the change of the measured value.

  202 is a measured value when the diameter of each of the thermal resistors 113 and 123 is changed between 10 mm and 30 mm when the thickness of the thermal resistor 113 is 5 mm and the thickness of the thermal resistor 123 is 10 mm. It is the graph which showed change of.

  Similarly, 203 is the case where the thickness of the thermal resistor 113 is 2.5 mm and the thickness of the thermal resistor 123 is 5 mm, and 204 is the thickness of the thermal resistor 113 is 1 mm and the thickness of the thermal resistor 123 is 2 mm. In the case where the thickness of the thermal resistor 113 is 0.5 mm and the thickness of the thermal resistor 123 is 1 mm, the diameter of each of the thermal resistors 113 and 123 is between 10 mm and 30 mm. It is the graph which showed the change of the measured value at the time of changing.

  As can be seen from FIG. 2, the measured value approaches the set temperature (that is, the measurement error decreases) as the diameters of the thermal resistors 113 and 123 increase (toward the right side of the drawing). It can also be seen that the measured value approaches the set temperature (that is, the measurement error becomes smaller) as the thickness of the thermal resistors 113 and 123 becomes thinner (upward in the drawing).

  Therefore, in the non-heating type thermometer, it is presumed that the measurement error decreases as the thickness of the thermal resistor is reduced and the diameter is increased.

3. Examination of simulation results The above simulation results are examined. FIG. 3 is a conceptual diagram showing the cause of the measurement error examined based on the simulation result. In FIG. 3, 301 indicates the deep body temperature of the subject.

  Considering the above-described measurement principle of the deep body temperature, all of the heat flow from the deep body temperature 301 passes through the thermal resistor 113 and the thermal resistor 123 (that is, the first temperature sensors 111 and 121 and the second temperature sensor). Desirably, it passes through one of the temperature sensors 121, 122) and is dissipated outside from the uniformizing member 130. However, in practice, the heat flow from the deep body temperature 301 diffuses while passing through the subcutaneous tissue of the subject, and a part of the heat flows from the body surface around the thermal resistor 113 and the thermal resistor 123 (that is, Without passing through the thermal resistors 113 and 123, they are directly diffused outside (see arrows 311 and 321).

  Further, part of the heat flow incident on the thermal resistor 113 and the thermal resistor 123 does not pass through the thermal resistor 113 and the thermal resistor 123 (that is, even though the first temperature sensor 111 passes). The second temperature sensor 112 does not pass through, or the first temperature sensor 121 passes through but does not pass through the second temperature sensor 122), and is exposed from the side surfaces of the thermal resistor 113 and the thermal resistor 123 to the outside. Dissipated (see arrows 312, 322).

  Here, for the heat flows 312, 322, by reducing the area of the side surfaces of the thermal resistor 113 and the thermal resistor 123 (that is, by reducing the thickness of the thermal resistor 113 and the thermal resistor 123), Dissipation from the side surfaces of the thermal resistor 113 and the thermal resistor 123 can be directly suppressed (this means that in FIG. 2, the thinner the thermal resistors 113 and 123 are, the closer to the upper side of the paper in FIG. 2). And so on) can be derived from the fact that the measured value approaches the set temperature).

  Further, by increasing the diameters of the thermal resistor 113 and the thermal resistor 123, the influence of the heat flows 312 and 322 on the first temperature sensors 111 and 121 and the second temperature sensors 121 and 122 is indirectly increased. (This is because the measured values approach the set temperature as the diameters of the thermal resistors 113 and 123 in FIG. 2 increase (toward the right side of FIG. 2)). Can lead).

  The effect of increasing the diameters of the thermal resistor 113 and the thermal resistor 123 can be replaced by arranging a heat insulating member on the body surface around the thermal resistor 113 and the thermal resistor 123. is there. This is because by disposing the heat insulating member, even if the diameters of the heat resistor 113 and the heat resistor 123 are reduced, the heat insulating member can directly suppress the dissipation due to the heat flows 311 and 321.

  A thermometer consisting of a combination of two heat resistors with a diameter of 10 mm and a thickness of 1 mm and 2 mm, respectively, was made as a prototype, and the water was heated to about 37 ° C instead of the living body. A pseudo-living body was created by placing a plastic plate on the skin and subcutaneous tissue on the skin, and an experiment was conducted using the pseudo-living body. Although a difference of about 1.1 ° C. occurred from the deep temperature calculated using (6), when a heat insulating member is arranged around the thermal resistor, the error is about 0.1 ° C., which is shown in FIG. As a result, it was possible to obtain a result that almost coincided with the calculation result when the diameter of the thermal resistor was 30 mm.

  Furthermore, with respect to the heat flows 311 and 321, the heat dissipation can be directly suppressed by arranging a heat insulating member on the body surface around the thermal resistors 113 and 123.

  Furthermore, by covering the entire upper surface of the thermal resistors 113 and 123 with the uniformizing member 130 having a higher thermal conductivity than the thermal resistors 113 and 123, the heat flow passing through the thermal resistors 113 and 123 is thermally conducted. From the side of the uniformizing member 130 having a high rate (that is, from the upper surface side of the thermal resistors 113 and 123), it is further dissipated (in this case, the thermal resistors 113 and 123 of the uniformizing member 130 are covered. It is assumed that the surface opposite to the side (back side) is exposed, but the exposure here refers not only to the case where the back side surface is in direct contact with the outside air, but also to the back side surface. This includes the case where it comes into contact with the outside air through applied coating agents and other materials). In other words, by directing the direction of the heat flow passing through the thermal resistors 113 and 123 in a direction substantially perpendicular to the body surface, it is possible to indirectly suppress the dissipation from the side surfaces of the thermal resistors 113 and 123. Conceivable.

From the above, in the non-heating type thermometer,
-Reduce the thickness of the thermal resistors 113 and 123,
A heat insulating member is disposed on the side surfaces of the thermal resistors 113 and 123;
The entire upper surface of the thermal resistors 113 and 123 is covered with a uniformizing member 130 having a higher thermal conductivity than the thermal resistors 113 and 123.
-The back surface of the uniformizing member 130 is exposed.
Thus, it is considered that the measurement error can be reduced.

4). Cross-sectional structure of non-heating type thermometer with measures for reducing measurement error Based on the above examination results, the non-heating type thermometer of the present embodiment with measures for reducing measurement errors will be described. FIG. 4A is a diagram showing a cross-sectional configuration of a non-heating type thermometer 400 according to the present embodiment.

  4A, reference numerals 111 and 121 denote first temperature sensors located on the side that comes into contact with the body surface when pasted on the body surface of the subject, and reference numerals 112 and 122 denote the first temperature sensors 111 and 121, respectively. It is the 2nd temperature sensor distribute | arranged to the side which opposes. In addition, the 1st and 2nd temperature sensors (111, 121, 112, 122) shall be comprised by the thermocouple, for example.

  Reference numeral 113 denotes a thermal resistor that is disposed between the first temperature sensor 111 and the second temperature sensor 112 and allows a heat flow from the body surface of the subject to pass therethrough. Similarly, 123 is a thermal resistor that is disposed between the first temperature sensor 121 and the second temperature sensor 122 and allows a heat flow from the body surface of the subject to pass therethrough.

  Note that the thermal resistor 113 and the thermal resistor 123 are each made of polyacetal having a thermal conductivity of 0.25 W / mK. The thermal resistor 113 has a flat plate shape with a thickness of 1 mm and a diameter of 10 mm, and the thermal resistor 123 has a flat plate shape with a thickness of 2 mm and a diameter of 10 mm. The first temperature sensors 111 and 121 and the second temperature sensors 112 and 122 are arranged at the center positions in the thermal resistor 113 and the thermal resistor 123, respectively.

  By having such a shape / arrangement, in the non-heating type thermometer 400 according to the present embodiment, it is possible to suppress the heat flow itself from the side surfaces of the thermal resistor 113 and the thermal resistor 123. Further, it is possible to suppress the influence on the first temperature sensors 111 and 112 and the second temperature sensors 121 and 122 as much as possible due to the heat flow dissipated from the body surface around the thermal resistor 113 and the thermal resistor 123. It becomes.

  Further, on the side surfaces of the thermal resistor 113 and the thermal resistor 123, a heat insulating member 401 (for example, foam rubber, polyurethane, etc.) having a lower thermal conductivity and higher flexibility than the thermal resistor 113 and the thermal resistor 123 is arranged. Has been. Thereby, dissipation of the heat flow from the body surface around the thermal resistor 113 and the thermal resistor 123 can be directly suppressed. Further, since the heat insulating member 401 can be deformed along the shape of the body surface, the heat insulating member 401 is suitable for sticking an unheated thermometer in close contact with the body surface.

  The heat insulating member 401 has a thickness substantially equal to that of each of the adjacent thermal resistors 113 and 123, and the thermal resistors 113 and 123 are fitted into opening holes provided in the center of the heat insulating member 401, respectively. It shall be included. Thereby, the side surfaces of the thermal resistors 113 and 123 are surrounded by the heat insulating member 401. Note that the upper surface of the heat insulating member 401 is covered with a plastic film 402.

  By having such a shape / arrangement, in the non-heating type thermometer 400 according to the present embodiment, it is possible to suppress the heat flow itself from the side surfaces of the thermal resistor 113 and the thermal resistor 123. Further, it is possible to suppress the influence on the first temperature sensors 111 and 112 and the second temperature sensors 121 and 122 as much as possible due to the heat flow dissipated from the body surface around the thermal resistor 113 and the thermal resistor 123. It becomes.

  Further, a uniformizing member 130 made of aluminum having a thermal conductivity of 236 W / mK is disposed on the upper surfaces of the thermal resistor 113 and the thermal resistor 123, and covers the entire upper surface of the thermal resistor 113 and the thermal resistor 123. ing. Thereby, the temperature of the upper surface of the thermal resistor 123 and the upper surface of the thermal resistor 123 (that is, the outside air side where the heat flow is dissipated) is made uniform, and the direction of the heat flow passing through the thermal resistors 113 and 123 is changed. The heat flow from the side surfaces of the thermal resistor 113 and the thermal resistor 123 can be indirectly suppressed by directing in a direction substantially perpendicular to the body surface.

  As shown in FIG. 4A, the thermal resistor 113 and the thermal resistor 123 are juxtaposed via a heat insulating member 401 with an interval of about 1 to 10 mm (preferably 2 to 6 mm). It is assumed that the heat flow passing through the heat resistor and the heat flow passing through the thermal resistor 123 are not mixed.

  It is assumed that the thermal resistor 113, the thermal resistor 123, and the heat insulating member 401 are arranged and fixed so that their bottom surfaces form the same plane. As a result, when pasted on the body surface of the subject, the bottom surface of the thermal resistor 113, the bottom surface of the thermal resistor 123, and the heat insulating member 401 are each pasted on the body surface of the subject without any gaps. Become.

  The bottom surfaces of the heat resistor 113 and the heat resistor 123 are respectively covered with heat conductive members 403 and 404 having good heat conductivity such as aluminum tape, and further, the body surface side of the non-heating type thermometer 400. It is assumed that the whole is covered with an adhesive tape (adhesive layer) 405 and an adhesive tape (release paper) 406.

5. Plan Configuration of Non-Heating Thermometer with Measures to Reduce Measurement Error Next, the plan configuration of the non-heating thermometer 400 will be described. FIGS. 5A and 5B are diagrams showing various planar configurations of the non-heating type thermometer 400 according to the present embodiment, each of which is in contact with the body surface when pasted on the body surface of the subject. The top view when it sees from the side (namely, back side) which opposes the surface of this, the top view when it sees from the side which contacts a body surface, and the top view when it cut | disconnects in the intermediate position are shown .

  5A, the outer peripheral shape of the heat insulating member 401 has a shape in which two linear portions along the direction in which the thermal resistor 113 and the thermal resistor 123 are juxtaposed are connected by two arc portions. And the case where the thermal resistor 113 and the thermal resistor 123 are arranged in the center position is shown. The thermal resistor 113 and the thermal resistor 123 may have a circular planar shape ((a)) or other shapes, for example, a rectangular shape ((b)).

  The example of FIG. 5B shows a case where the outer peripheral shape of the heat insulating member 401 has a shape in which four linear portions are connected, and the thermal resistor 113 and the thermal resistor 123 are arranged at the center position. Also in this case, as in FIG. 5A, the planar shapes of the thermal resistor 113 and the thermal resistor 123 may be circular ((a)) or other shapes, for example, rectangular (( b)).

6). External structure of body temperature measuring system provided with non-heating type thermometer Next, a body temperature measuring system provided with non-heating type thermometer 400 shown in FIG. 4 will be described. FIG. 6 is a diagram showing an external configuration of a body temperature measurement system including a non-heating type thermometer 400 and a body temperature display device 600 that can communicate with the non-heating type thermometer 400.

  The non-heating type thermometer 400 includes an RF-ID tag (not shown) (an antenna unit for performing communication and a processing unit that processes the detected temperature value of each temperature sensor). The RF-ID tag receives power supply from the body temperature display device 600 via an antenna (for example, power supply by generation of induced electromotive force by electromagnetic waves having a frequency of 13.56 MHz), and a power supply circuit (not shown) included in the processing unit. ), The entire processing unit is activated, and the acquired deep body temperature data is transmitted to the body temperature display device 600 together with various information.

  The body temperature display device 600 includes an RF-ID reader / writer. When the body temperature display device 600 is brought close to the RF-ID tag, the body temperature display device 600 is magnetically coupled to the RF-ID tag and is included in the processing unit of the RF-ID tag. Power is supplied to the circuit, and deep body temperature data and various information are received from the RF-ID tag.

  As described above, the body temperature measurement system shown in FIG. 6 has a configuration in which the non-heating type thermometer 400 includes the RF-ID tag and operates by receiving power supply from the RF-ID reader / writer of the body temperature display device 600. Therefore, it is not necessary to mount a power source inside, and it is possible to realize a reduction in size and weight. As a result, it becomes easy to attach to the measurement site of the subject for a long time.

  In addition, the measurement result is that the body temperature display device 600 including an RF-ID reader / writer that transmits electromagnetic waves of a predetermined frequency, for example, 13.56 MHz, is 5 to 30 mm of the measurement site where the non-heating type thermometer 400 is attached. Since reading can be performed simply by bringing the object closer to a certain position, it is possible to significantly reduce the burden of confirmation and recording work of measurement results by the measurer.

7). Functional Configuration of Thermometer and Body Temperature Display Device Next, the functional configuration of the non-heating type thermometer 400 will be described. FIG. 7 is a diagram illustrating a functional configuration of a non-heating type thermometer 400 including an RF-ID tag including an antenna 700 and a processing unit 710.

  In FIG. 7, reference numeral 711 denotes an excessive rise prevention unit that controls to stop the body temperature measurement process when the processing unit 710 enters a state that affects the accuracy of body temperature measurement. Here, the state that affects the accuracy of the body temperature measurement is, for example, that excessive power is supplied from the body temperature display device 600 via the antenna 700 and the entire processing unit 710 generates heat (temperature rise). A state that gives an error to the result.

  A wireless communication unit 712 includes a rectifier circuit, a booster circuit, and the like. In the wireless communication unit 712, the AC voltage generated in the antenna 700 is converted into a predetermined DC voltage and supplied to the storage unit 713 and the control unit 714. Further, the deep body temperature data acquired by the control unit 714 is transmitted to the body temperature display device 600 via the antenna 700 in a predetermined format.

  A storage unit 713 stores identification information unique to the RF-ID tag. Reference numeral 714 denotes a control unit that controls operations of the excessive rise prevention unit 711, the wireless communication unit 712, and the storage unit 713. In addition, the output from the temperature sensing unit 720 is processed and transmitted to the wireless communication unit 712 as deep body temperature data.

  Reference numeral 720 denotes a temperature sensing unit, which includes a sensor unit 721 including first and second temperature sensors (111, 112, 121, 122), and a circuit unit 722 that processes the output of the sensor unit 721.

8). Functional Configuration of Body Temperature Display Device Next, the functional configuration of the body temperature display device 600 will be described. FIG. 8 is a diagram illustrating a functional configuration of the body temperature display device 600. The body temperature display device 600 includes a power supply unit including a battery, a rechargeable battery, and an operation switch including a power ON / OFF switch, but is omitted here.

  In FIG. 8, reference numeral 800 denotes an RF-ID reader / writer, which includes an antenna 801, a wireless communication unit 802, a signal conversion unit 803, and a signal processing unit 804.

  The antenna 801 generates an electromagnetic wave having a predetermined frequency, for example, 13.56 MHz, and is magnetically coupled with the antenna 700 of the RF-ID tag of the non-heating thermometer 400, so that the RF-ID tag. Power is supplied to the processing unit 710 and data is received from the RF-ID tag.

  In the wireless communication unit 802, in order to supply power to the RF-ID tag of the non-heating type thermometer 400 through the antenna 801, the voltage applied to the antenna 801 is controlled, or the non-heating type through the antenna 801. Data received from the RF-ID tag of the thermometer 400 is transmitted to the signal conversion unit 803.

  The signal conversion unit 803 converts the data transmitted from the wireless communication unit 802 into digital data and transmits the digital data to the signal processing unit 804.

  The signal processing unit 804 processes the digital data received from the signal conversion unit 803 and transmits it to the control unit 811.

  The control unit 811 controls operations of the wireless communication unit 802, the signal conversion unit 803, and the signal processing unit 804. Further, the deep body temperature data transmitted from the signal processing unit 804 is stored in the storage unit 812 together with the identification information, or displayed on the display unit 813. Further, the deep body temperature data stored in the storage unit 812 is transmitted together with the identification information to another information processing device (another information processing device connected by wire via the wired communication unit 814) via the wired communication unit 814. To do.

  As is clear from the above description, in the non-heating type thermometer according to the present embodiment, the heat flow from the body surface around the thermal resistor is suppressed and the heat flow from the body surface around the thermal resistor is suppressed. The configuration is such that the influence on the temperature sensor due to the dissipation is suppressed, and the dissipation of the heat flow from the side surface of the thermal resistor is suppressed. As a result, the measurement accuracy of the deep body temperature of the non-heating type thermometer can be improved. Moreover, since it can affix so that the whole thermometer may closely_contact | adhere with respect to the body surface which is not necessarily flat, mounting | wearing property improves.

[Second Embodiment]
In the first embodiment, the temperature sensors (111, 121, 112, 122) are configured by, for example, thermocouples, but other temperature sensors such as a thermistor may be used.

  In the first embodiment, the thermal resistors 113 and 123 have shapes (thickness and diameter) of 1 mm, 20 mm, 2 mm, and 20 mm, respectively, but the present invention is not limited to this. .

  The thermal resistor 113 may have a thickness in the range of 0.5 to 10 mm and a diameter in the range of 5 to 20 mm. The thickness of the thermal resistor 123 may be in the range of 1 mm to 20 mm, and the diameter may be in the range of 5 to 20 mm. However, the ratio of the thicknesses of the thermal resistor 113 and the thermal resistor 123 may be any ratio as long as it is a predetermined value. : Desirably about 2. In addition, for the thermal resistor 113 and the thermal resistor 123, members having different thermal conductivities may be used.

  In the first embodiment, polyacetal is used as the material of the thermal resistors 113 and 123. However, the present invention is not limited to this, and any material having the same or lower thermal conductivity may be used. For example, other materials may be used. In the first embodiment, aluminum is used as the material of the homogenizing member 130. However, the present invention is not limited to this, and the material having higher thermal conductivity than the thermal resistors 113 and 123 is used. Other materials may be used if they exist.

  In the first embodiment, the thickness of the heat insulating member 401 is configured to be substantially equal to the thickness of the adjacent thermal resistors 113 and 123, but the present invention is not limited to this. In the first embodiment, foamed rubber, polyurethane, or the like is used as the material of the heat insulating member 401. However, the present invention is not limited to this, and as shown in FIG. Other materials having lower thermal conductivity and higher flexibility than the thermal resistor 123 may be used.

  In the first embodiment, the thermal resistors 113 and 123 are arranged without gaps with respect to the heat insulating member 401. However, the present invention is not limited to this, and the thermal resistors 113 and 123 and the heat insulating members are insulated. A gap may be provided between the member 401 and the member 401.

DESCRIPTION OF SYMBOLS 100 ... Equivalent circuit, 111 ... 1st temperature sensor, 112 ... 2nd temperature sensor, 113 ... Thermal resistor, 121 ... 1st temperature sensor, 122 ... 1st 2 temperature sensors, 123 ... thermal resistor, 400 ... thermometer, 130 ... homogenizing member, 401 ... heat insulating member, 402 ... plastic film, 403 ... heat conducting member, 404 ... Heat conduction member, 405 ... Attaching tape (adhesive layer), 406 ... Attaching tape (release paper), 600 ... Body temperature display device

Claims (8)

A thermometer that measures deep body temperature by contacting the body surface of a subject,
First and second thermal resistances in which a first temperature sensor is disposed on the side in contact with the body surface, and a second temperature sensor is disposed on a side opposite to the surface on the side in contact with the body surface. Body,
A uniformizing member configured to cover only the surface of the first and second thermal resistors that faces the surface that contacts the body surface;
A heat insulating member disposed so as to surround side surfaces of the first and second thermal resistors;
A thermometer comprising:   The thermometer according to claim 1, wherein the first thermal resistor has a thickness of 0.5 to 10 mm, and the second thermal resistor has a thickness of 1 to 20 mm.   2. The thermometer according to claim 1, wherein the uniformizing member is formed of a material having a higher thermal conductivity than the first and second thermal resistors.   The thermometer according to claim 1, wherein the first and second thermal resistors have a thermal conductivity of 0.5 W / mK or less.   The surface of the first thermal resistor that is in contact with the body surface and the surface of the second thermal resistor that is in contact with the body surface form the same plane. The thermometer according to claim 1, wherein a second thermal resistor is disposed.   The first and second thermal resistors are arranged so that a gap is formed between a side surface of the first thermal resistor and a side surface of the second thermal resistor. Item 1. The thermometer according to Item 1.   The first and second thermal resistors are arranged such that a gap is formed between a side surface of the first and second thermal resistors and the heat insulating member. 1. The thermometer according to 1.   2. The thermometer according to claim 1, wherein the heat insulating member is formed of a material having lower thermal conductivity and higher flexibility than the first and second thermal resistors.

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