JP7504496B2 - Non-contact body temperature fluctuation detection system - Google Patents

Description

The present invention relates to a non-contact body temperature fluctuation detection system that can detect body temperature fluctuations that are presumed to be due to a person being measured having a fever without contacting the person.

In nursing homes and other care facilities, it is desirable to measure vital signs such as body temperature and blood pressure regularly or irregularly to understand the health condition of those requiring care and to take appropriate measures. However, some care recipients dislike being touched by others when taking their temperature or blood pressure due to factors such as a decline in cognitive function, and as a result, it is difficult to measure their vital signs properly due to strong resistance, or forcibly measuring their vital signs can cause them great stress. In addition, there are small devices such as smart watches that can measure vital signs by wearing them in appropriate places on the body, but some care recipients with reduced cognitive function may feel uncomfortable wearing such small devices and may become violent or damage the small devices in an attempt to remove them. When such care recipients are to be the subjects of vital information measurement, it is desirable to be able to measure their vital signs non-contact without restraining the subjects.

A heart rate measurement method has been proposed that can calculate the average heart rate cycle with high accuracy by transmitting radio waves toward the human body to be measured, receiving the waves reflected off the surface of the body, and performing a specified calculation (see, for example, Patent Document 1). Furthermore, the 24 GHz to millimeter wave band radio waves used in the heart rate measurement method described in Patent Document 1 can penetrate clothing and bedding to accurately capture the surface position of the human body, making it suitable for use in nursing facilities and the like. Furthermore, the heart rate measurement method described in Patent Document 1 can calculate the respiratory rate in addition to the heart rate.

JP 2019-213772 A

However, the heart rate measurement method described in Patent Document 1 does not allow for the determination of body temperature. In care facilities and the like, body temperature is important as vital information for those requiring care, and if an elderly person requiring care with a weakened immune system develops a fever, prompt action is required. Therefore, it is insufficient to simply measure the heart rate and respiratory rate of the person requiring care without contact using the heart rate measurement method described in Patent Document 1, and body temperature measurement continues to be a significant burden for the person requiring care and the caregiver, as before.

In addition, non-contact thermometers that use infrared sensors to measure the surface temperature of the skin are widely used, but in order to take the temperature, the thermometer must be brought close to the face or wrist of the person requiring care. This can sometimes be rejected by the person requiring care, making it difficult to take the temperature properly, and is therefore not user-friendly for caregivers.

The reason why care facilities and other facilities take the temperature of people requiring care is to know if they have a fever, and temperature information is not necessarily required as body temperature. If it is possible to know when a person's body temperature has changed from their normal temperature, which varies from person to person, to a high temperature (a temperature that may indicate a fever), it will be possible to take appropriate measures against the fever as soon as possible.

Therefore, the present invention aims to provide a non-contact body temperature fluctuation detection system that can detect body temperature fluctuations that are presumed to be due to a fever in a subject without contact.

To solve the above problem, the present invention is characterized by including a heart rate information acquisition device that receives reflected waves of radio waves irradiated to the subject and acquires heart rate information based on vibrations on the body surface caused by the subject's pulsation, and a body temperature fluctuation detection device that estimates the subject's body temperature from a detected heart rate based on the heart rate information acquired by the heart rate information acquisition device, and detects body temperature fluctuations due to fever in the subject when the estimated body temperature exceeds the subject's normal body temperature range.

In addition, in the non-contact body temperature fluctuation detection system, the body temperature fluctuation detection device may set the heart rate of the subject when the subject has a normal body temperature as a normal body temperature reference value, set the heart rate corresponding to the increase in body temperature that can be considered as a fever as a fever determination value, set the heart rate obtained by adding the normal body temperature reference value and the fever determination value as a fever reference value, and detect a body temperature fluctuation due to a fever of the subject when the detected heart rate reaches the fever reference value.

In addition, in the non-contact body temperature fluctuation detection system, the body temperature fluctuation detection device may set the heart rate corresponding to the rise in body temperature that can be considered as a high fever as a high fever judgment value, set the heart rate obtained by adding the normal body temperature reference value and the high fever judgment value as a high fever reference value, and detect a state in which the subject is presumed to have a high fever when the detected heart rate reaches the fever reference value.

In addition, in the non-contact body temperature fluctuation detection system, the body temperature fluctuation detection device may set the normal body temperature reference value to a value corresponding to the time of day based on the circadian rhythm of body temperature.

The non-contact body temperature fluctuation detection system according to the present invention allows the body temperature fluctuation detection device to detect body temperature fluctuations due to fever of the subject based on the subject's heart rate information acquired non-contact by the heart rate information acquisition device.

1 is a schematic diagram of a non-contact body temperature variation detection system according to a first embodiment. 1 is an explanatory diagram of a first example of detection conditions that are set in advance in a body temperature variation detection device. FIG. FIG. 1 is a characteristic diagram showing the circadian rhythm of body temperature. FIG. 11 is an explanatory diagram of a second example of detection conditions that are set in advance in the body temperature variation detection device. FIG. 11 is a schematic diagram of a non-contact body temperature variation detection system according to a second embodiment.

The embodiment of the present invention will be described in detail below with reference to the accompanying drawings. First, FIG. 1 shows a schematic configuration of a non-contact body temperature fluctuation detection system 1 according to the first embodiment. In this non-contact body temperature fluctuation detection system 1, a reflected wave of an electric wave irradiated to a person P from a heart rate information acquisition device 10 is received, and heart rate information is acquired based on the vibration of the body surface caused by the pulsation of the person P. The body temperature fluctuation detection device 20 to which the heart rate information is input from the heart rate information acquisition device 10 estimates the body temperature of the person P, and when the estimated body temperature reaches a fever detection range that exceeds the normal body temperature range of the person P, detects the body temperature fluctuation due to the fever of the person P, and displays the body temperature fluctuation on the display device 30. In other words, if a caregiver or the like is looking at the display device 30 on which the body temperature fluctuation of the person P is displayed, the caregiver or the like can quickly know the fever state of the person P and can quickly take appropriate measures. Note that communication between the heart rate information acquisition device 10 and the body temperature fluctuation detection device 20, and communication between the body temperature fluctuation detection device 20 and the display device 30 may be performed using either a wired connection or a wireless connection.

The heart rate information acquisition device 10 can be made into a small unit structure that packages a millimeter wave radar sensor 11 that detects the reflected waves of millimeter waves irradiated from a transmitting antenna 11a with a receiving antenna 11b, a calculation means 12 that processes the detection signal of the millimeter wave radar sensor 11, and a power source (not shown), and is installed on a wall or ceiling of a room. The heart rate information acquisition device 10 may be a constant-drive type that continues to measure the heart rate of the subject P, or an intermittent drive type that is activated at regular intervals or when a specified event occurs to measure the heart rate of the subject P.

It is desirable that the millimeter wave radar sensor 11 of the heart rate information acquisition device 10 can receive reflected waves of sufficient strength from the subject P located 2 to 3 meters away. In addition, by using a MIMO type millimeter wave radar sensor 11 equipped with multiple transmitting antennas 11a and receiving antennas 11b (for example, two transmitting antennas 11a and four receiving antennas 11b), it is possible to obtain detection information that can determine the heart rates of multiple subjects P within the detection area. The calculation means 12 of the heart rate information acquisition device 10 can be composed of a custom IC chip that incorporates a computer function and a heart rate calculation program, etc., and calculates the detection signal of the millimeter wave radar sensor 11 using a specified algorithm to obtain respiratory rate information and heart rate information (pulse cycle, pulse rate per minute, etc.). The calculation algorithm for heart rate information used by the calculation means 12 is not particularly limited, and any appropriate existing calculation method known in the art may be used.

The body temperature fluctuation detection device 20 is equipped with an acquired heart rate recording means 21, which continuously stores the heart rate information transmitted from the heart rate information acquisition device 10 together with a time stamp, so that the change in the heart rate can be confirmed in chronological order even later. When the heart rate information of multiple subjects P is received from the heart rate information acquisition device 10, the information is recorded in the acquired heart rate recording means 21 so that each subject P can be identified. When the respiration rate information of the subject P is transmitted from the heart rate information acquisition device 10, an acquired respiration rate recording means may be provided which records the acquired respiration rate as well as the acquired heart rate. This acquired heart rate recording means 21 transmits display data including the latest heart rate information to the display device 30, so that the heart rate information is visually displayed on the display unit 31 of the display device 30. The content displayed on the display unit 31 is not particularly limited, and only the latest heart rate may be displayed, or a graph showing the change in heart rate going back a certain time may be displayed.

The body temperature fluctuation detection device 20 is equipped with a normal body temperature reference value storage means 22, a fever judgment value storage means 23, a high fever judgment value storage means 24, and a fluctuation state judgment means 25, and can detect body temperature fluctuations due to fever of the subject P, and a state in which the subject P is estimated to have a high fever. For this purpose, it uses the knowledge widely known in the medical field that there is a strong correlation between heart rate and body temperature. For example, the following calculation formula for estimated temperature is known: "Estimated body temperature [°C] = normal body temperature [°C] + (detected pulse rate [bpm] - normal pulse rate [bpm]) ÷ 10 x 0.55". This formula means that "when the body temperature rises by 0.55 [°C], the heart rate increases by 10 [beats/min]", and indicates that if the normal body temperature [°C] and the normal pulse rate [bpm] are known, the estimated body temperature [°C] can be uniquely determined from the detected heart rate [bpm] based on the heart rate information acquired by the heart rate information acquisition device 10.

Here, a first example of the detection conditions used by the body temperature fluctuation detection device 20 will be described based on the detection condition explanatory diagram in Figure 2. In Figure 2, the subject P's normal body temperature (normal body temperature) is 36.5 [°C], and the normal pulse rate (normal body temperature reference value N) corresponding to the normal body temperature is 65 [bpm]. Therefore, the normal body temperature of 36.5 [°C] and the normal body temperature reference value of 65 [bpm] are stored in the normal body temperature reference value storage means 22 of the body temperature fluctuation detection device 20. Then, the fluctuation state determination means 25 applies the normal body temperature of 36.5 [°C] and the normal body temperature reference value of 65 [bpm] stored in the normal body temperature reference value storage means 22 and the detected heart rate based on the heart rate information acquired by the heart rate information acquisition device 10 to the calculation formula for the estimated body temperature to obtain the estimated body temperature. In other words, if the detected heart rate based on the heart rate information acquired by the heart rate information acquisition device 10 is 65 bpm, the estimated body temperature = normal body temperature = 36.5°C.

In addition, the Infectious Diseases Act defines fever as 37.5°C or higher. If this definition is adopted as the detection condition, in FIG. 2, if the subject P's normal body temperature is between 36.5°C and 37.5°C, it is considered to be in the normal body temperature range. However, when the subject P's body temperature reaches 37.5°C and enters the temperature range of the fever detection range, the subject P is determined to have a fever. The temperature difference of 10°C from the normal body temperature to the temperature at which the subject P's body temperature is determined to have a fever is equal to the number of times that the heart rate increases 18 times from normal. Therefore, the fever determination value storage means 23 of the body temperature fluctuation detection device 20 stores +18 times as the fever determination value M1, and the fluctuation state determination means 25 calculates the fever reference value = N + M1 = 65 + 18 = 83 bpm, which is the sum of the normal body temperature reference value N and the fever determination value M1. That is, the heart rate of the subject P when his/her body temperature is normal is the normal body temperature reference value N, the heart rate corresponding to the rise in body temperature that can be considered as a fever is the fever determination value M1, and the heart rate obtained by adding the normal body temperature reference value N and the fever determination value M1 is the fever reference value N+M1, and these values are used to detect changes in body temperature caused by the subject P's fever.

When the detected heart rate based on the heart rate information acquired by the heart rate information acquisition device 10 reaches or exceeds the fever reference value (83 bpm or more), the fluctuation state determination means 25 determines that the subject P is in a fever state, and outputs a fever detection signal to the display device 30. That is, by setting the fever reference value N+M1 as the lower limit of the fever detection range, the fluctuation state determination means 25 can detect a state in which the subject P is presumed to be in a fever state by comparing with the detected heart rate. Note that the fever reference value, which is the boundary between the normal body temperature range and the fever detection range, may be used not only as the lower limit of the fever detection range, but also as the upper limit of the normal body temperature range. In that case, the condition for detecting a fever may be that the detected heart rate exceeds the fever reference value.

The display device 30 receives a fever detection signal from the fluctuation state determination means 25 of the body temperature fluctuation detection device 20, and alerts the caregiver by displaying on the display unit 31 that the person being measured P has a fever. The display device 30 may be provided with a fever notification lamp 32 (shown by a dashed line in FIG. 1), which may be lit or flashed to make it easier for the caregiver to notice that the person being measured P has a fever.

In addition, the Infectious Diseases Act defines a high fever as 38.0°C or higher. If this definition is adopted as the detection condition, in FIG. 2, when the body temperature of the person being measured P reaches 38.0°C and enters the high fever detection range, the person being measured P is determined to have a high fever. The temperature difference of 15°C from when the body temperature of the person being measured P is determined to be a high fever is equal to the number of times that the heart rate increases 27 times from normal. Therefore, the high fever determination value storage means 24 of the body temperature fluctuation detection device 20 stores +27 times as the high fever determination value M2, and the fluctuation state determination means 25 calculates the high fever reference value = N + M2 = 65 + 27 = 92 bpm, which is the sum of the normal body temperature reference value N and the high fever determination value M2. That is, the heart rate corresponding to the rise in body temperature that can be considered as a high fever is set as the high fever judgment value M2, and the heart rate obtained by adding the normal body temperature reference value N and the high fever judgment value M2 is set as the high fever reference value N+M2, which is used to detect when the subject P has a high fever.

When the detected heart rate based on the heart rate information acquired by the heart rate information acquisition device 10 reaches or exceeds the high fever reference value (92 bpm or more), the fluctuation state determination means 25 determines that the subject P is in a state of having a high fever, and outputs a high fever detection signal to the display device 30. In other words, by setting the high fever reference value N+M2 as the lower limit of the high fever detection range, the fluctuation state determination means 25 can detect a state in which the subject P is estimated to be having a high fever by comparing it with the detected heart rate.

The display device 30, which receives a high fever detection signal from the temperature fluctuation state determination means 25 of the body temperature fluctuation detection device 20, alerts the caregiver by displaying on the display unit 31 that the person P is having a high fever. The display device 30 may be provided with a high fever notification lamp 33 (shown by a broken line in FIG. 1) so that the caregiver can easily notice that the person P is having a high fever. Since the high fever reference value is higher than the fever reference value, the high fever detection range is naturally included in the fever detection range, and fever detection and high fever detection are established simultaneously. Therefore, the fever notification lamp 32 and the high fever notification lamp 33 of the display device 30 will be lit or flashed at the same time, but the fever notification lamp 32 and the high fever notification lamp 33 may be controlled exclusively to emphasize the importance of high fever detection over fever detection. For example, by setting the fever detection range below the lower limit of the high fever detection range, when the detected heart rate exceeds the fever detection range and reaches the high fever detection range, the fever detection signal from the fluctuation state determination means 25 stops and a new high fever detection signal is input to the display device 30, making it possible to issue an alert by turning off the fever notification lamp 32 and turning on or blinking the high fever notification lamp 33. For example, by issuing an alert such as turning off the yellow-emitting fever notification lamp 32 and blinking the red high fever notification lamp 33, it is possible to impress upon the caregiver that the body temperature of the person P has risen to a state that is estimated to be a high fever.

The display device 30 may be provided with a synthetic voice output means 34 (shown by the dashed line in FIG. 1) that outputs a synthetic voice to inform the caregiver that the person P has a fever or is emitting a high fever. The body temperature fluctuation detection device 20 may also be provided with a hypothermia determination function, so that when the body temperature of the person P calculated from the detected heart rate based on the heart rate information acquired by the heart rate information acquisition device 10 falls below the lower limit of the normal body temperature range and reaches the hypothermia detection range (shown by the dashed line in FIG. 1), a hypothermia detection signal may be output to the display device 30 to inform the person P that he or she is in a hypothermia state.

It is also known that human body temperature changes according to the time of day (24 hours) as a circadian rhythm (see, for example, the body temperature changes in FIG. 3), and deep body temperature measured rectally tends to rise during the day and fall at night. For example, when regular temperature checks are taken around 9:00 a.m., as shown in FIG. 3, it is appropriate to set the normal body temperature of the subject P to 36.5°C, but the normal body temperature from around 5:00 p.m. to around 11:00 p.m. is 37.5°C or higher. For this reason, the detected heart rate based on the heart rate information acquired by the heart rate information acquisition device 10 between 5:00 p.m. and 11:00 p.m. reaches the fever reference value N+M1=83 bpm, resulting in a false positive detection in which the fluctuation state determination means 25 determines that the body temperature fluctuation is due to fever, even though the subject P has a normal body temperature. Similarly, for the high fever reference value N+M2, a false positive detection occurs in which the fluctuation state determination means 25 determines that the subject P has a high fever, even though the subject P has only a slight fever.

In order to reduce such false positives, it is possible to set the average value of the deep body temperature (for example, around 37.0°C, which is halfway between the upper and lower limits) as the normal body temperature, but in order to do so, it is necessary to know the circadian rhythm of the person P to be measured. If the person P is a person requiring care who dislikes having their temperature taken, it is very difficult to measure the body temperature every short period of time and record the circadian rhythm. However, if the non-contact body temperature variation detection system 1 of this embodiment obtains and records the heart rate of the person P constantly or every relatively short period of time, it is possible to record the changes in body temperature that can be estimated from the heart rate fluctuation, so it is possible to obtain the circadian rhythm of body temperature without contact. By recording this circadian rhythm for multiple days and comparing the daily circadian rhythm, the average circadian rhythm can be estimated, and a reasonable average body temperature for each day can be determined. In addition, by setting appropriate fever determination value M1 and high fever determination value M2 according to the estimated circadian rhythm of body temperature, false positives of body temperature fluctuations can be reduced and the reliability of the non-contact body temperature variation detection system 1 can be improved.

In the first example of detection conditions applied to the body temperature fluctuation detection device 20 described above, the subject P's normal body temperature [°C] and normal pulse rate [bpm] at this time are set as constant values, and the detection conditions for the fever determination value M1 and high fever determination value M2 are also set to constant values obtained by calculation, but the detection conditions are not limited to this. For example, if detection conditions are set that take into account the circadian rhythm in which the subject P's normal body temperature changes depending on the time the body temperature is measured, it will be possible to more appropriately detect body temperature fluctuations due to fever.

Here, we will explain a non-contact body temperature variation detection system 1 that applies the second example of detection conditions (see Figure 4) that take into account the circadian rhythm of body temperature to the body temperature variation detection device 20, making it possible to appropriately determine body temperature variations due to fever or a high fever state of the subject P. Note that the actual measured change in deep body temperature (actual measured body temperature change) is mixed with small fluctuations due to various factors, and it is not desirable to use this as the circadian rhythm of body temperature as it is. Therefore, the body temperature variation detection device 20 uses the body temperature change (smoothed body temperature change) in which the tendency of body temperature rise or fall has been smoothed within the allowable error range as the circadian rhythm of the subject P.

To enable detection of body temperature fluctuations under the detection conditions of the second example, the normal body temperature reference value storage means 22 of the body temperature fluctuation detection device 20 stores the circadian rhythm of the body temperature of the subject P, and supplies the normal body temperature reference value N corresponding to the current time to the fluctuation state determination means 25 based on the time information supplied from the clock means 26. The normal body temperature reference value storage means 22 may store a correspondence table between time and heart rate as a 24-hour circadian rhythm, or may store a relational equation that uniquely determines the heart rate from the time. Alternatively, one heart rate that represents a predetermined time span may be used as the normal body temperature reference value. For example, in the time range of 20:00 to 22:00, the heart rate is calculated based on the body temperature at 21:00 (approximately 37.6°C), in the time range of 22:00 to 24:00, the heart rate is calculated based on the body temperature at 23:00 (approximately 37.55°C), in the time range of 0:00 to 2:00, the heart rate is calculated based on the body temperature at 1:00 (approximately 37.35°C), in the time range of 2:00 to 4:00, the heart rate is calculated based on the body temperature at 3:00 (approximately 36.8°C), in the time range of 4:00 to 6:00, the heart rate is calculated based on the body temperature at 5:00 (36.45°C), in the time range of 6:00 to 8:00, the heart rate is calculated based on the body temperature at 7:00 (36.35°C), and in the time range of 8:00 to 10:00, the heart rate is calculated based on the body temperature at 23:00 (approximately 37.55°C). In the time range of 10:00, the heart rate is calculated based on the body temperature at 9:00 (approximately 36.45°C), in the time range of 10:00-12:00, the heart rate is calculated based on the body temperature at 11:00 (approximately 36.95°C), in the time range of 12:00-14:00, the heart rate is calculated based on the body temperature at 13:00 (approximately 37.25°C), in the time range of 14:00-16:00, the heart rate is calculated based on the body temperature at 15:00 (approximately 37.4°C), in the time range of 16:00-18:00, the heart rate is calculated based on the body temperature at 17:00 (approximately 37.5°C), and in the time range of 18:00-20:00, the heart rate is calculated based on the body temperature at 19:00 (approximately 37.6°C).

If fever is normal temperature + 0.5 [°C], the fever judgment value should be +9, which is the number of pulse rate increases corresponding to 0.5 [°C]. Therefore, "+9" is stored in the fever judgment value storage means 23 as the fever judgment value. If high fever is normal temperature + 1.0 [°C], the high fever judgment value should be +18, which is the number of pulse rate increases corresponding to 1.0 [°C]. Therefore, "+18" is stored in the high fever judgment value storage means 24 as the high fever judgment value.

At the time when the heart rate information is acquired from the heart rate information acquisition device 10, the fluctuation state determination means 25 acquires the normal body temperature reference value N (e.g., 65 [bpm]) corresponding to the time measured by the clock means 26 and the fever determination value M1 (e.g., +9 times) stored in the fever determination value storage means 23, calculates the fever reference value N + M1 (e.g., 74 [bpm]), and compares the detected heart rate with the fever reference value. If the "detected heart rate < fever reference value", it is estimated to be within the normal body temperature range, so the fluctuation state determination means 25 does not output a fever detection signal. On the other hand, if the "detected heart rate ≧ fever reference value", it is outside the normal body temperature range, so acquires the high fever determination value M2 (e.g., +18 times) stored in the high fever determination value storage means 24, calculates the high fever reference value N + M2 (e.g., 83 [bpm]), and compares the detected heart rate with the high fever reference value. If the "detected heart rate < high fever reference value", it is estimated to be within the fever detection range, so the fluctuation state determination means 25 outputs a fever detection signal, and if the "detected heart rate ≧ high fever reference value", it is estimated to be within the high fever detection range, so the fluctuation state determination means 25 outputs a high fever detection signal.

As described above, even when the detection conditions of the second example are applied to the body temperature fluctuation detection device 20, it is possible to accurately detect body temperature fluctuations due to fever of the subject P and a state in which the subject P is presumed to have a high fever from the detected heart rate based on the heart rate information acquired by the heart rate information acquisition device 10. Moreover, since the heart rate corresponding to the normal body temperature at the time of measurement in the circadian rhythm of body temperature prepared in advance is used as the normal body temperature reference value N, the normal body temperature of the subject P at the time of measurement becomes the reference, and a fever state (including a high fever state) can be accurately detected whether the normal body temperature is low or high.

When the heart rate information acquisition device 10 is placed in a location where it can acquire heart rate information from multiple subjects P, the heart rate information acquisition device 10 transmits the heart rate information to the body temperature fluctuation detection device 20 together with an identifier that can identify the subject P. The body temperature fluctuation detection device 20 can then be configured to record the acquired heart rate of each subject P who can be identified by the identifier, and to be able to determine the fluctuation state due to fever of each subject P. The display device 30 can also be configured to display or notify the information of each subject P who can be identified by the identifier so that it can be identified.

The non-contact body temperature variation detection system 1 of the first embodiment described above is suitable for watching over the person P who requires care by monitoring body temperature variations based on the heart rate information of the person P, but if the caregiver is in a place where he or she cannot see the display content of the display device 30, a prompt response cannot be made even if a fever is detected in the person P. Therefore, the non-contact body temperature variation detection system 1' of the second embodiment shown in Figure 5 uses a body temperature variation detection device 20' equipped with a communication means 27, which makes it possible to transmit recorded information on the acquired heart rate based on the heart rate information acquired from the heart rate information acquisition device 10, a fever detection signal, a high fever detection signal, etc. to the management device 40.

The management device 40 is equipped with an information receiving means 41 that receives information sent directly by wireless communication (or wired communication) from the body temperature variation detection devices 20' at each location, and information sent from the body temperature variation detection devices 20' at each location via a network N such as a public communication line. The information received by the information receiving means 41 is managed for each body temperature variation detection device 20' by a collected information management means 42. In addition, a notification status determination means 43 determines whether the collected information indicates a notification situation that requires a notification, such as fever or high fever, and if a notification is required, a notification information transmission means 44 transmits notification information to an information terminal device 50 carried by a staff member (caregiver) at a care facility where a measured person P with a fever or other condition is present.

For example, when a fever detection signal or high fever detection signal is received from a body temperature variation detection device 20'a, 20'b that is within the range of wireless communication, such as in the vicinity of the management device 40 or on the same floor, the management device 40 selects an information terminal device 50a, 50e carried by a staff member in charge of the person P being measured who is being monitored by the body temperature variation detection device 20'a, 20'b or a care staff member near the person P in question, and transmits notification information based on the fever detection signal or high fever detection signal. This allows a care staff member who visits the person P who is suspected of having a fever or the like to take prompt action.

When the management device 40 receives a fever detection signal or a high fever detection signal from the body temperature fluctuation detection devices 20'c, 20'd, ..., 20'h that are monitoring a person P who lives in a separate building from the building where the management device 40 is installed or a person P who is receiving home care, the management device 40 selects the information terminal devices 50b, 50c, 50d carried by the staff member in charge of the person P monitored by the body temperature fluctuation detection devices 20'c, 20'd, ..., 20'h or the visiting nurse in charge of the person P, and transmits notification information based on the fever detection signal or high fever detection signal via the network N. This allows the care staff member or visiting nurse to quickly respond to the person P who is suspected of having a fever.

In this way, in the non-contact body temperature variation detection system 1' according to the second embodiment, various information is centrally managed by the management device 40, and notification information is sent to the information terminal device 50 as necessary, so there is no need to frequently check the display device 30 installed as a vital sign monitor for the person P, and the necessary information is sent when a fever or the like is detected, which has the advantage of eliminating the hassle for caregivers, etc.

The above describes the embodiments of the non-contact body temperature fluctuation detection system according to the present invention based on the attached drawings, but the present invention is not limited to these embodiments, and may be implemented by converting publicly known, existing equivalent technical means within the scope of the claims.

LIST OF SYMBOLS 1, 1' Non-contact body temperature fluctuation detection system 10 Heart rate information acquisition device 11 Millimeter wave radar sensor 11a Transmitting antenna 11b Receiving antenna 12 Calculation means 20, 20' Body temperature fluctuation detection device 21 Acquired heart rate recording means 22 Normal body temperature reference value storage means 23 Fever determination value storage means 24 High fever determination value storage means 25 Fluctuation state determination means 26 Time measurement means 27 Communication means 30 Display device 31 Display unit 32 Fever notification lamp 33 High fever notification lamp 34 Synthesized voice output means 40 Management device 41 Information receiving means 42 Collected information management means 43 Notification status determination means 44 Notification information transmission means 50 Information terminal device

Claims (3)

a heart rate information acquiring device that receives a reflected wave of a radio wave irradiated to a subject and acquires heart rate information based on vibrations on a body surface caused by the subject's heartbeat;
a body temperature fluctuation detection device that estimates the body temperature of the subject from a detected heart rate based on the heart rate information acquired by the heart rate information acquisition device, and detects a body temperature fluctuation due to fever of the subject when the estimated body temperature exceeds a normal body temperature range of the subject;
Including,
The body temperature fluctuation detection device is a non-contact body temperature fluctuation detection system that acquires the heart rate of the person being measured constantly or at relatively short intervals, records the circadian rhythm of body temperature that can be estimated from the heart rate fluctuations over multiple days, smoothes the tendency of body temperature increase or decrease in the average circadian rhythm estimated from the daily circadian rhythm within an allowable error range to set the circadian rhythm for the person being measured, and sets the normal body temperature range based on the body temperature value of the circadian rhythm for the person being measured corresponding to the time when the heart rate information was acquired. The non-contact body temperature fluctuation detection system described in claim 1, characterized in that the body temperature fluctuation detection device sets the heart rate corresponding to the body temperature value of the circadian rhythm of the subject at the time the heart rate information is acquired as a normal body temperature reference value, sets the heart rate corresponding to the increase in body temperature that can be considered a fever as a fever judgment value, and sets the heart rate obtained by adding the normal body temperature reference value and the fever judgment value as a fever reference value, and detects body temperature fluctuations due to fever of the subject when the detected heart rate reaches the fever reference value. The non-contact body temperature fluctuation detection system described in claim 2, characterized in that the body temperature fluctuation detection device sets the heart rate corresponding to the increase in body temperature that can be considered a high fever as a high fever judgment value, sets the heart rate obtained by adding the normal body temperature reference value and the high fever judgment value as a high fever reference value, and detects a state in which the person being measured is presumed to have a high fever when the detected heart rate reaches the fever reference value .