Health management system and health management method

Abstract

To provide a health management system further accurately detecting changes in conditions of heart failure.SOLUTION: A health management system executes bathing determination processing, first acquisition processing, second acquisition processing, pulse data acquisition processing, determination processing and output processing. The bathing determination processing includes determining when a subject starts bathing or finishes bathing. The first acquisition processing includes acquiring a measurement result of the subject's blood oxygen saturation in a first measurement period as the first oxygen saturation. The second acquisition processing includes acquiring the subject's blood oxygen saturation in a second measurement period as the second oxygen saturation. The pulse data acquisition processing includes acquiring the subject's pulse rate. The determination processing includes determining the subject's condition of the heart failure on the basis of a value of the first oxygen saturation, a value of the second oxygen saturation, and a change in the pulse rate. The output processing includes outputting a determination result in the determination processing.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a health management system and a health management method. [Background technology]

[0002] The heart failure monitoring device described in Patent Document 1 includes a blood oxygen saturation measurement means, an oxygen saturation fluctuation range calculation means, and a heart failure warning means. The blood oxygen saturation measurement means is capable of measuring the subject's blood oxygen concentration over time. The oxygen saturation fluctuation range calculation means calculates the amount of change in the blood oxygen concentration measured by the blood oxygen saturation measurement means. The heart failure warning means outputs a signal indicating an alarm about the onset of heart failure when the amount of change exceeds a predetermined reference value. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-216113 Summary of the Invention [Problem to be solved by the invention]

[0004] A subject's blood oxygen saturation level may change when the subject performs certain actions. Furthermore, the manner in which the subject's blood oxygen saturation level changes may also vary depending on the type of activity the subject performs. If this point is not taken into consideration and a determination is made based on a comparison of the amount of change in blood oxygen concentration with a reference value, as in the heart failure monitoring device described in Patent Document 1, it is difficult to accurately detect changes in health related to heart failure. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention is a health management system that executes a bathing determination process that determines when a subject starts bathing and when he or she finishes bathing; a first acquisition process that defines at least a portion of the bathing period from when the start of bathing is determined in the bathing determination process to when the end of bathing is determined as a first measurement period, and acquires the measurement result of the subject's blood oxygen saturation during the first measurement period as a first oxygen saturation; a second acquisition process that defines at least a portion of the non-bathing period from when the end of bathing is determined in the bathing determination process to when the start of bathing is determined as a second measurement period, and acquires the subject's blood oxygen saturation during the second measurement period as a second oxygen saturation; a determination process that makes a determination regarding the subject's condition based on heart failure based on the value of the first oxygen saturation and the value of the second oxygen saturation; and an output process that outputs the determination result of the determination process.

[0006] In order to solve the above problem, the present invention is a health management method in which a computer executes a bathing determination process to determine when a subject's bathing start and end are determined, a first acquisition process to set at least a portion of the bathing period from when the bathing start is determined in the bathing determination process to when the bathing end is determined as a first measurement period, and acquire the measurement result of the subject's blood oxygen saturation during the first measurement period as a first oxygen saturation, a second acquisition process to set at least a portion of the non-bathing period from when the bathing end is determined to when the bathing start is determined in the bathing determination process to a second measurement period, and acquire the subject's blood oxygen saturation during the second measurement period as a second oxygen saturation, a determination process to make a determination regarding the subject's condition based on heart failure based on the value of the first oxygen saturation and the value of the second oxygen saturation, and an output process to output the determination result of the determination process. [Effects of the Invention]

[0007] According to the above configuration, changes in the condition related to heart failure can be detected more accurately. [Brief explanation of the drawings]

[0008] [Figure 1]FIG. 1 shows the overall configuration of a health management system according to the first embodiment. [Figure 2] FIG. 2 is a graph showing the average blood oxygen saturation levels of subjects without a history of heart failure. [Figure 3] FIG. 3 is a graph showing the average blood oxygen saturation levels of subjects with a history of heart failure. [Figure 4] FIG. 4 is a sequence diagram showing the processing of the health management system in the first embodiment. [Figure 5] FIG. 5 is a graph showing the standard deviation of vital signs for 30 minutes after bathing, when the subjects were heart failure patients who had not been readmitted to hospital. [Figure 6] FIG. 6 is a graph showing the standard deviation of vital signs for 30 minutes after bathing, when the subjects were heart failure patients who had previously been re-hospitalized. [Figure 7] FIG. 7 is a sequence diagram showing the processing of the health management system in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a first embodiment and a second embodiment of a health management system will be described with reference to the drawings. (First embodiment) <Overall structure> The health management system 10 is a system for determining the condition of a subject who is a heart failure patient, based on heart failure.

[0010] 1, the health management system 10 includes a biosensor 20, a bathing detection sensor 30, a mobile terminal 40, a server 50, and an external terminal 60. The mobile terminal 40, the server 50, and the external terminal 60 are all examples of computers.

[0011] The biosensor 20 can measure blood oxygen saturation and pulse rate as bioinformation BI of the subject. In this embodiment, the biosensor 20 is a pulse oximeter. Preferably, the pulse oximeter calculates the blood oxygen saturation and pulse rate from the transmittance of red light and infrared light when the subject is irradiated with the respective lights. Preferably, the biosensor 20 can be attached to the fingertip or wrist of the subject.

[0012] Although not shown, the biosensor 20 includes a memory unit and a communication unit. The memory unit and communication unit may be configured as a single chip or module, or may be configured as separate chips or modules. The memory unit may include a read-only ROM, a readable / writable non-volatile memory, a readable / writable volatile memory, etc. This also applies hereinafter.

[0013] The storage unit stores the detected biometric information BI. The communication unit is capable of communicating with an external device. The communication method of the communication unit is, for example, Bluetooth (registered trademark). The biometric sensor 20 is capable of transmitting the biometric information BI stored in the storage unit to the external device via the communication unit.

[0014] When the power of the biosensor 20 is on, the biosensor 20 measures the bioinformation BI at a predetermined interval, for example, every three minutes. That is, the biosensor 20 detects the blood oxygen saturation and pulse rate of the subject at each predetermined interval. The biosensor 20 stores the measured bioinformation BI in a storage unit. Then, the biosensor 20 transmits the bioinformation BI to the mobile terminal 40 every time it measures the bioinformation BI.

[0015] In this embodiment, the bathing detection sensor 30 is a human presence sensor that detects the presence or absence of a person in the bathroom. The human presence sensor is, for example, a pyroelectric infrared sensor that detects temperature changes of a heat source within the detection area. The human presence sensor may also be incorporated into a light bulb or the like in the bathroom. Although not shown in the figures, the bathing detection sensor 30 is equipped with a communication unit. The communication unit is capable of communicating with external devices. The communication method of the communication unit is, for example, Bluetooth (registered trademark).

[0016] When the bathing detection sensor 30 detects that there is a person in the bathroom, it transmits a detection signal to the mobile terminal 40. When the bathing detection sensor 30 detects that there is no person in the bathroom, it transmits a non-detection signal to the mobile terminal 40. The bathing detection sensor 30 can transmit the detection signal and non-detection signal to the mobile terminal 40 via the communication unit.

[0017] In this embodiment, the mobile terminal 40 is a smartphone. The mobile terminal 40 is, for example, owned by the subject. Although not shown in the drawings, the mobile terminal 40 includes a storage unit, a first communication unit, and a second communication unit. In this embodiment, the communication method of the first communication unit is Bluetooth (registered trademark). The communication method of the second communication unit is a method that uses a mobile phone communication network. Therefore, the communication range of the second communication unit of the mobile terminal 40 is wider than the communication range of the first communication unit.

[0018] The mobile terminal 40 can acquire the biometric information BI from the biometric sensor 20 via the first communication unit. The mobile terminal 40 can also acquire the detection signal and non-detection signal from the bathing detection sensor 30 via the first communication unit. The mobile terminal 40 can also store the biometric information BI, the detection signal, and the non-detection signal in the memory unit.

[0019] The mobile terminal 40 is capable of transmitting the biometric information BI, the detection signal, and the non-detection signal stored in the storage unit of the mobile terminal 40 to the server 50 via the second communication unit. Although not shown, the server 50 has a control unit, a storage unit, and a communication unit. Specifically, the control unit is a CPU. The communication unit uses a mobile phone communication network as its communication method. The server 50 executes various processes by executing programs stored in the storage unit. The server 50 can also transmit signals to the mobile terminal 40 by executing communication processes.

[0020] The server 50 is capable of executing a bathing determination process. The bathing determination process is a process for determining whether a subject has started bathing or finished bathing. Specifically, the server 50 determines that the subject has started bathing by acquiring a detection signal. Furthermore, the server 50 determines that the subject has finished bathing by acquiring a non-detection signal. As described above, the detection signal is a signal transmitted from the bathing detection sensor 30 when it detects that a person is in the bathroom. Furthermore, the non-detection signal is a signal transmitted from the bathing detection sensor 30 when it detects that no person is in the bathroom. Therefore, the bathing determination process is a process in which the bathing detection sensor 30 determines that the subject has started bathing based on the detection of a person, and, after determining that the subject has started bathing, determines that the subject has finished bathing based on the fact that the bathing detection sensor 30 no longer detects a person. Note that "executable by the server 50" means that the control unit of the server 50 is capable of executing the process. The same applies to the following explanation.

[0021] The server 50 is capable of executing a first acquisition process. Here, the first measurement period is at least a portion of the bathing period from when the start of bathing is determined in the bathing determination process to when the end of bathing is determined. In this embodiment, the first measurement period is the entire bathing period. In the first acquisition process, the server 50 extracts the subject's biological information BI during the first measurement period from multiple pieces of biological information BI stored in the memory unit. Then, the server 50 acquires the average value of blood oxygen saturation included in the biological information BI during the first measurement period as the first oxygen saturation.

[0022] The server 50 is capable of executing a second acquisition process. Here, the second measurement period is at least a portion of the non-bathing period from when the bathing end is determined in the bathing determination process to when the bathing start is determined. In other words, the second measurement period is at least a portion of the period before and after the subject's bathing. In this embodiment, the second measurement period is the period from when the biosensor 20 is turned on before bathing to when the bathing start is determined in the bathing determination process. In the second acquisition process, the server 50 extracts the subject's bioinformation BI during the second measurement period from the multiple bioinformation BI stored in the memory unit. Then, the server 50 acquires the average blood oxygen saturation level included in the bioinformation BI during the second measurement period as the second oxygen saturation level.

[0023] The server 50 is capable of executing a pulse data acquisition process. The pulse data acquisition process is a process for acquiring the pulse rate of the subject. Specifically, the server 50 extracts the subject's biological information BI during a first measurement period from the plurality of biological information BI stored in the storage unit. The server 50 then acquires the average value of the pulse rate included in the biological information BI during the first measurement period as the first pulse rate. The server 50 also extracts the subject's biological information BI during a second measurement period from the plurality of biological information BI stored in the storage unit. The server 50 then acquires the average value of the pulse rate included in the biological information BI during the second measurement period as the second pulse rate.

[0024] The server 50 is capable of executing a determination process. The determination process is a process for determining the subject's condition due to heart failure based on the first oxygen saturation value, the second oxygen saturation value, and changes in the pulse rate. For example, if both the first condition and the second condition are satisfied in the determination process, the server 50 determines that the subject's condition due to heart failure has worsened. Furthermore, if either or both of the first condition and the second condition are not satisfied in the determination process, the server 50 determines that the subject's condition due to heart failure has not worsened.

[0025] The first condition is that the first oxygen saturation value is smaller than the second oxygen saturation value, and the difference between the first and second oxygen saturation values ​​is equal to or greater than a predetermined first threshold. The second condition is that the first pulse rate is greater than the second pulse rate by equal to or greater than a predetermined second threshold. The first and second thresholds can be determined as values ​​when a deterioration in the subject's heart failure condition is observed in an experiment or the like. For example, the first threshold is 4.5%. That is, the first threshold is a value determined within the range of 4% to 8%. For example, the second threshold is 30 beats per minute.

[0026] The server 50 is capable of executing an output process. The output process is a process of outputting the determination result of the determination process. Specifically, in the output process, the server 50 outputs the determination result of the determination process to the mobile terminal 40 and the external terminal 60.

[0027] In this embodiment, the external terminal 60 is a PC installed in a hospital. Although not shown, the external terminal 60 includes a communication unit. In this embodiment, the communication unit uses a mobile phone communication network as its communication method. The external terminal 60 can receive signals from the server 50 via the communication unit.

[0028] <About the first threshold> As shown in Figure 2, the blood oxygen saturation of subjects without a history of heart failure was measured in nine states, and the average value for each state was calculated. The first state is the subject's average state for the entire day. The second state is the state when not bathing. The third state is the state while bathing. The fourth state is the state 30 minutes after finishing bathing. The fifth state is the state of the subject after bathing, but during the day. The sixth state is the state while sleeping. The seventh state is the state after waking up. The eighth state is the state during the 6-minute walking test. The ninth state is the state 30 minutes after the end of the 6-minute walking test. The 6-minute walking test is conducted by the subject walking on flat ground for 6 minutes.

[0029] As shown in Figure 2, for subjects without a history of heart failure, the average blood oxygen saturation level was 95% or higher in each condition. In other words, for subjects without a history of heart failure, no significant drop in blood oxygen saturation was observed even during bathing.

[0030] As shown in Figure 3, the blood oxygen saturation of subjects with a history of heart failure was measured in nine states, and the average value for each state was calculated. The nine states are the same as those shown in Figure 2. As shown in Figure 3, the average blood oxygen saturation of the subjects was 95% or higher in states 1, 2, 5, 6, 7, and 9.

[0031] On the other hand, in the eighth condition, where the subjects were walking for six minutes, the subjects' average blood oxygen saturation was below 93%. Thus, the experiment showed that subjects with a history of heart failure experienced a decrease in blood oxygen saturation during the six-minute walking test.

[0032] In the third condition, when the subjects were bathing, the average blood oxygen saturation of the subjects was below 91%. This means that for subjects with a history of heart failure, the blood oxygen saturation decreased not only during the 6-minute walk test but also during bathing, to a level equal to or greater than that during the 6-minute walk test.

[0033] In the second state, i.e., when the subject was not bathing, the average blood oxygen saturation was 95.5% or higher. Therefore, when comparing the average blood oxygen saturation during bathing with the average blood oxygen saturation during non-bathing, a difference of 4.5% or more was observed. Based on these measurement results, it is preferable that the first threshold be set to a value within the range of 4% to 8%.

[0034] <Processing performed by the health management system> An example of the processing executed by the health management system 10 will be described with reference to FIG. First, the biosensor 20 attached to the subject is powered on. The biosensor 20 measures the subject's blood oxygen saturation and pulse rate as bioinformation BI every three minutes. The biosensor 20 transmits the bioinformation BI to the mobile terminal 40 every time it measures the bioinformation BI. Note that FIG. 4 omits part of the transmission of the bioinformation BI from the biosensor 20 to the mobile terminal 40.

[0035] Then, every time the mobile terminal 40 receives the biometric information BI, it transmits the biometric information BI to the server 50 via the second communication unit. The server 50 stores the biometric information BI. Note that in FIG. 4, part of the transmission of the biometric information BI from the mobile terminal 40 to the server 50 is omitted.

[0036] At a certain point in time, the subject starts bathing. That is, the subject enters the bathroom. The bathing detection sensor 30 detects that the subject has started bathing and transmits a detection signal to the mobile terminal 40 via the communication unit.

[0037] The mobile terminal 40 then transmits the received detection signal to the server 50 via the second communication unit. The server 50 then executes a bathing determination process by acquiring the detection signal from the biosensor 20. In other words, the server 50 determines that the subject has started bathing by acquiring the detection signal.

[0038] Here, the server 50 executes a second acquisition process and a pulse data acquisition process in response to the determination of the start of bathing. In the second acquisition process, the server 50 acquires the subject's blood oxygen saturation as a second oxygen saturation during a second measurement period, which is at least a part of the non-bathing period from when the previous bathing end is determined to be over until when the bathing start is determined. As described above, the second measurement period is the period from when the biosensor 20 is turned on before bathing until when the bathing start is determined in the bathing determination process.

[0039] In the second acquisition process, the server 50 first extracts the blood oxygen saturation level for the second measurement period from the acquired biological information BI. Then, in the second acquisition process, the server 50 acquires the average value of the extracted blood oxygen saturation levels as the second oxygen saturation level. Also, in the second acquisition process, as a pulse data acquisition process, the server 50 first extracts the pulse rate for the second measurement period from the acquired biological information BI. Then, in the pulse data acquisition process, the server 50 acquires the average value of the extracted pulse rates as the second pulse rate.

[0040] Even after the server 50 determines that bathing has started, the biosensor 20 continues to measure the subject's blood oxygen saturation and pulse rate as bioinformation BI every three minutes, just as it did before bathing. The biosensor 20 then transmits the bioinformation BI to the mobile terminal 40 every time it measures the bioinformation BI. The mobile terminal 40 then transmits the bioinformation BI to the server 50 via the second communication unit every time it receives the bioinformation BI.

[0041] At a certain point, the subject finishes bathing. That is, the subject leaves the bathroom. The bathing detection sensor 30 detects that the subject has finished bathing and transmits a non-detection signal to the mobile terminal 40 via the communication unit.

[0042] The mobile terminal 40 then transmits a non-detection signal to the server 50 via the second communication unit. The server 50 then executes a bathing determination process by acquiring the non-detection signal from the biosensor 20. In other words, the server 50 determines that the subject has finished bathing by acquiring the non-detection signal. The server 50 then treats the period from when it is determined that the subject has started bathing to when it is determined that the subject has finished bathing as a first measurement period.

[0043] The server 50 executes the first acquisition process and the pulse data acquisition process in response to the determination that bathing has ended. In other words, the server 50 acquires the subject's blood oxygen saturation and pulse rate during a first measurement period, which is at least a part of the bathing period.

[0044] In the first acquisition process, the server 50 first extracts the blood oxygen saturation level for the first measurement period from the acquired biological information BI. Then, in the first acquisition process, the server 50 acquires the average value of the extracted blood oxygen saturation levels as the first oxygen saturation level. Also, in the pulse data acquisition process, the server 50 extracts the pulse rate for the first measurement period from the acquired biological information BI. Then, in the pulse data acquisition process, the server 50 acquires the average value of the extracted pulse rates as the first pulse rate.

[0045] The server 50 executes a determination process. Specifically, the server 50 determines whether the first oxygen saturation level is smaller than the second oxygen saturation level by at least a first threshold. That is, the server 50 determines whether the above-described first condition is satisfied.

[0046] Furthermore, the server 50 determines whether the first pulse rate is greater than the second pulse rate by a second threshold or more. That is, the server 50 determines whether the above-mentioned second condition is satisfied.

[0047] In the determination process, the server 50 determines that the subject's heart failure condition has worsened if both the first condition and the second condition are satisfied. In addition, in the determination process, the server 50 determines that the subject's heart failure condition has not worsened if either or both of the first condition and the second condition are not satisfied. In this embodiment, "worsening of the subject's heart failure condition" includes not only the worsening itself but also signs of worsening.

[0048] The server 50 executes an output process. The server 50 executes the output process by outputting the determination result of the determination process to the mobile terminal 40. For example, if the determination result is "the subject's condition of heart failure has worsened," the server 50 transmits a first signal to the mobile terminal 40. Then, upon receiving the first signal, the mobile terminal 40 displays text, an image, etc. indicating that the subject's condition of heart failure has worsened on a display of the mobile terminal 40. Furthermore, upon receiving the first signal, the mobile terminal 40 may display text, an image, etc. indicating that the subject's condition of heart failure has worsened on a display of the mobile terminal 40, along with the text, an image, etc. indicating the above. Furthermore, for example, if the determination result is "the subject's condition of heart failure has not worsened," the server 50 transmits a second signal to the mobile terminal 40. Then, upon receiving the second signal, the mobile terminal 40 displays text, an image, etc. indicating that the subject's condition of heart failure has not worsened on a display of the mobile terminal 40. In the output process, the server 50 also outputs the determination result to the external terminal 60. Similar to the mobile terminal 40, the external terminal 60 outputs the determination result to a display that the external terminal 60 has or a display connected to the external terminal 60.

[0049] <Effects of the first embodiment> (1-1) In the above embodiment, a determination is made regarding the subject's condition due to heart failure based on the first oxygen saturation level, the second oxygen saturation level, and pulse data. As described above, if the subject has a history of heart failure, changes occur in the biometric information BI between bathing and not bathing that are not observed in subjects without a history of heart failure. In the above embodiment, a determination is made regarding the subject's condition due to heart failure based on the first oxygen saturation level value, the second oxygen saturation level value, and the comparison result between the first pulse rate and the second pulse rate in the determination process. As a result, a worsening condition due to heart failure can be detected more accurately.

[0050] (1-2) In the above embodiment, the server 50 determines that the subject's heart failure condition is worsening if the first oxygen saturation value is smaller than the second oxygen saturation value and the difference between the first and second oxygen saturation values ​​is equal to or greater than a predetermined first threshold value. In other words, it can more accurately determine that the decrease in blood oxygen saturation during bathing is due to a worsening heart failure condition.

[0051] (1-3) In the above embodiment, the first threshold is a value set within the range of 4% to 8%. This range of the first threshold allows for more accurate assessment of the worsening of the condition of heart failure due to bathing, as described above.

[0052] (1-4) In the above embodiment, the server 50 determines that the subject's heart failure condition is worsening if the first pulse rate is greater than the second pulse rate by a predetermined second threshold or more in the determination process. In other words, it can more accurately determine that the change in pulse rate before and after bathing is a decrease due to heart failure.

[0053] (1-5) In the above embodiment, the server 50 executes the output process by outputting the determination result of the determination process to the mobile terminal 40. This allows the subject to check the condition of heart failure himself / herself.

[0054] (1-6) In the above embodiment, the server 50 determines when the subject has started bathing in the bathing determination process based on the bathing detection sensor 30 going from detecting a person to no longer detecting a person. After determining that the subject has started bathing, the server 50 determines when the subject has finished bathing based on the bathing detection sensor 30 going from not detecting a person to detecting a person. By automatically performing the bathing determination process in this way, forgetting to input the timing as described above can be prevented, resulting in more accurate determinations in the determination process.

[0055] (Second embodiment) The second embodiment of the health management system will be described below, with the same components as those in the first embodiment being omitted or simplified.

[0056] When the power of the biosensor 20 is on, the biosensor 20 measures the bioinformation BI at a predetermined interval, for example, every few tens of seconds. That is, the biosensor 20 detects the blood oxygen saturation and pulse rate of the subject at each predetermined interval. The biosensor 20 stores the measured bioinformation BI in a storage unit. Then, the biosensor 20 transmits the bioinformation BI to the mobile terminal 40 every time it measures the bioinformation BI.

[0057] The server 50 is capable of executing a first acquisition process. Here, the first measurement period is at least a portion of the bathing period from when the start of bathing is determined in the bathing determination process to when the end of bathing is determined. In this embodiment, the first measurement period is the entire bathing period. In the first acquisition process, the server 50 extracts the subject's biological information BI during the first measurement period from multiple biological information BI stored in the memory unit. Then, in the first acquisition process, the server 50 acquires the average value of blood oxygen saturation included in the biological information BI during the first measurement period as the first oxygen saturation.

[0058] The server 50 is capable of executing a second acquisition process. Here, the second measurement period is at least a portion of the non-bathing period from when the bathing end is determined in the bathing determination process to when the bathing start is determined. In other words, the second measurement period is at least a portion of the period before and after the subject's bathing. In this embodiment, the second measurement period is the period from when the bathing end is determined to be until the biosensor 20 is turned off. The second measurement period also includes a timing that is a predetermined specific time after the bathing end is determined in the bathing determination process. The specific time is, for example, 30 minutes. In the second acquisition process, the server 50 extracts the bioinformation BI of the subject during the second measurement period that is closest to the timing 30 minutes after the bathing end is determined. Then, in the second acquisition process, the server 50 acquires the blood oxygen saturation included in the extracted bioinformation BI as the second oxygen saturation.

[0059] The server 50 is capable of executing a pulse data acquisition process. The pulse data acquisition process is a process for acquiring the subject's pulse rate. Specifically, in the pulse data acquisition process, the server 50 extracts biometric information BI from a pre-bathing period before the bathing start is determined in the bathing determination process. Then, in the pulse data acquisition process, the server 50 acquires the average pulse rate included in the biometric information BI from the pre-bathing period as the pre-bathing pulse rate. Note that after detecting the end of bathing in the bathing determination process, the server 50 resets the determination after a predetermined period has elapsed. Then, the server 50 defines the period from the reset until the next determination of the start of bathing as the pre-bathing period. Furthermore, in the pulse data acquisition process, the server 50 extracts biometric information BI that is closest to the timing a predetermined specified time after the end of bathing is determined in the bathing determination process. Then, the server 50 acquires the pulse rate included in the extracted biometric information BI as the post-bathing pulse rate. In this embodiment, the specified time is 10 minutes. Note that "after the specified time" here includes the time when the specified time has elapsed and any time after the specified time has elapsed.

[0060] The server 50 is capable of executing a determination process. The determination process is a process for determining the subject's condition due to heart failure based on the first oxygen saturation value, the second oxygen saturation value, and changes in pulse rate. For example, in the determination process, the server 50 determines that the subject's condition due to heart failure has worsened if both the first condition and the second condition are met. In addition, in the determination process, the server 50 determines that the subject's condition due to heart failure is improving if either or both of the first condition and the second condition are not met.

[0061] The first condition is that the post-bathing pulse rate is greater than the pre-bathing pulse rate by a predetermined reference value or more. The second condition is that the value obtained by subtracting the first oxygen saturation level from the second oxygen saturation level is equal to or less than a predetermined value set within the range of 3% to 4%. The above-mentioned reference value and predetermined value can be determined as values ​​when a deterioration in the subject's heart failure condition is observed in an experiment, etc.

[0062] <About standard values> As described above, as shown in FIG. 2, for subjects without a history of heart failure, the average blood oxygen saturation of the subjects was 95% or higher in each condition.

[0063] As shown in Figure 3, for subjects with a history of heart failure, the average blood oxygen saturation of the subjects was 95% or higher in the first, second, fifth, sixth, seventh, and ninth states.

[0064] As mentioned above, in the third state, i.e., while the subject was bathing, the subject's average blood oxygen saturation was 91% or less. Furthermore, in the fourth state, i.e., 30 minutes after the subject finished bathing, the blood oxygen saturation was 94% or more and 95% or less. Therefore, when comparing the average blood oxygen saturation during bathing with the blood oxygen saturation 30 minutes after bathing, a difference of 3% or more and 4% or less was observed. Based on these measurement results, it is preferable that the standard value be set within the range of 4% or more and 8% or less.

[0065] <Regarding specific timing> Using patients who had not previously been re-hospitalized for heart failure as subjects, we investigated the distribution of pulse rate and blood oxygen saturation over several tens of minutes before bathing. Then, as shown in Figure 5, we calculated the standard deviation of the pulse rate and blood oxygen saturation values ​​for the same patients 30 minutes after bathing from the average values ​​of the distribution before bathing. In Figure 5, the dashed line indicates the pulse rate trend, and the solid line indicates the blood oxygen saturation trend. The reference value was the average of the measurements taken by the subject over several tens of minutes before bathing. In the graph shown in Figure 5, a pulse rate standard deviation smaller than 0 indicates a value smaller than the average value before bathing. A pulse rate standard deviation greater than 0 indicates a value larger than the average value before bathing. Furthermore, a blood oxygen saturation standard deviation smaller than 0 indicates a blood oxygen saturation value smaller than the average value before bathing. A blood oxygen saturation standard deviation greater than 0 indicates a blood oxygen saturation value larger than the average value before bathing.

[0066] As shown in Figure 5, when the subject was a patient who had not been readmitted to hospital for heart failure, the standard deviation of the heart rate fluctuated between 0 and approximately 600 seconds, approaching 0. The standard deviation of the heart rate then became less than 1 at approximately 600 seconds, or approximately 10 minutes. In other words, when the subject was a patient with heart failure who had not been readmitted to hospital, it was found that there was not a large discrepancy between the pulse rate 10 minutes after bathing and the pulse rate before bathing.

[0067] Furthermore, when the subject was a patient with no history of rehospitalization due to heart failure, the standard deviation of blood oxygen saturation fluctuated and approached zero from 0 to approximately 600 seconds. At approximately 600 seconds, or approximately 10 minutes, the standard deviation of blood oxygen saturation was close to zero. For this subject, the standard deviation of blood oxygen saturation also remained close to zero at approximately 1200 seconds, or approximately 20 minutes. In other words, when the subject was a heart failure patient with no history of rehospitalization, the blood oxygen saturation 10 and 20 minutes after bathing did not deviate significantly from the blood oxygen saturation before bathing. Furthermore, for this subject, the standard deviation of blood oxygen saturation started out negative and sometimes showed positive values ​​during the period from 0 to 600 seconds.

[0068] As shown in Figure 6, the standard deviations of pulse rate and blood oxygen saturation for 30 minutes after bathing were calculated for patients who had previously been rehospitalized due to heart failure, as in the example shown in Figure 5. In Figure 6, the dashed line indicates the pulse rate trend, and the solid line indicates the blood oxygen saturation trend. The reference values ​​were determined in the same manner as in the example shown in Figure 5. For patients with heart failure who had previously been rehospitalized, the standard deviation of the pulse rate was greater than 1 for approximately 600 seconds, i.e., approximately 10 minutes. In other words, for patients with heart failure who had previously been rehospitalized, the pulse rate 10 minutes after bathing was relatively higher than the reference value, when the average pulse rate before bathing was used as the reference. Thus, comparing the pulse rate 10 minutes after bathing with the pulse rate before bathing, it was found that for heart failure patients with previously been rehospitalized, who are more likely to exhibit symptoms of heart failure, the pulse rate 10 minutes after bathing was higher than the pulse rate before bathing.

[0069] Furthermore, when the subject was a patient who had previously been re-hospitalized due to heart failure, the standard deviation of blood oxygen saturation was approximately minus 0.5 at approximately 600 seconds, or approximately 10 minutes. Similarly, for the same subject, the standard deviation of blood oxygen saturation was also negative at approximately 1200 seconds, or approximately 20 minutes. Thus, it was found that in heart failure patients who had previously been re-hospitalized and are prone to developing heart failure symptoms, the blood oxygen saturation 10 and 20 minutes after finishing bathing was lower than the blood oxygen concentration before bathing.

[0070] Furthermore, for this subject, the standard deviation of blood oxygen saturation was generally negative for the period from 0 to approximately 600 seconds. In other words, if the subject was a heart failure patient who had been readmitted to hospital, and the average blood oxygen saturation level before bathing was used as the standard, the blood oxygen saturation level 10 minutes after bathing ended was generally lower than the standard.

[0071] <Processing performed by the health management system> An example of the processing executed by the health management system 10 will be described with reference to Fig. 7. Note that the mobile terminal 40, server 50, and external terminal 60, which are computers, execute each processing in cooperation to realize a health management method consisting of each processing.

[0072] First, the biosensor 20 attached to a subject who is a heart failure patient is powered on. The biosensor 20 measures the subject's blood oxygen saturation and pulse rate as bioinformation BI every few tens of seconds. The biosensor 20 transmits the bioinformation BI to the mobile terminal 40 every time it measures the bioinformation BI. Note that FIG. 7 omits part of the transmission of the bioinformation BI from the biosensor 20 to the mobile terminal 40.

[0073] Then, every time the mobile terminal 40 receives the biometric information BI, it transmits the biometric information BI to the server 50 via the second communication unit. The server 50 stores the biometric information BI. Note that in FIG. 7, part of the transmission of the biometric information BI from the mobile terminal 40 to the server 50 is omitted.

[0074] At a certain point in time, the subject starts bathing. That is, the subject enters the bathroom. The bathing detection sensor 30 detects that the subject has started bathing and transmits a detection signal to the mobile terminal 40 via the communication unit.

[0075] The mobile terminal 40 then transmits the received detection signal to the server 50 via the second communication unit. The server 50 then executes a bathing determination process by acquiring the detection signal from the biosensor 20. In other words, the server 50 determines that the subject has started bathing by acquiring the detection signal.

[0076] Meanwhile, the server 50 executes a pulse data acquisition process in response to the determination of the start of bathing. In other words, the server 50 acquires the pulse rate during the pre-bathing period before the determination of the start of bathing as the pre-bathing pulse rate. Specifically, the server 50 extracts the subject's biometric information BI during the pre-bathing period stored in the storage unit. Then, the server 50 acquires the average value of the pulse rates included in the extracted biometric information BI as the pre-bathing pulse rate.

[0077] The biosensor 20 measures the subject's blood oxygen saturation and pulse rate as bioinformation BI every few tens of seconds, just as before bathing. Then, the biosensor 20 transmits the bioinformation BI to the mobile terminal 40 every time it measures the bioinformation BI. Then, every time the mobile terminal 40 receives the bioinformation BI, it transmits the bioinformation BI to the server 50 via the second communication unit.

[0078] At a certain point, the subject finishes bathing. That is, the subject leaves the bathroom. The bathing detection sensor 30 detects that the subject has finished bathing and transmits a non-detection signal to the mobile terminal 40 via the communication unit.

[0079] Then, the mobile terminal 40 transmits a non-detection signal to the server 50 via the second communication unit. The server 50 then executes a bathing determination process by acquiring the non-detection signal from the biosensor 20. In other words, the server 50 determines that the subject has finished bathing by acquiring the non-detection signal.

[0080] The server 50 executes a first acquisition process in response to the determination that bathing has ended. In other words, the server 50 acquires the subject's blood oxygen saturation during a first measurement period, which is at least a part of the bathing period. Specifically, the server 50 extracts the blood oxygen saturation during the first measurement period from the acquired biological information BI. The server 50 then acquires the minimum value of the extracted blood oxygen saturation as the first oxygen saturation.

[0081] Next, the biosensor 20 measures the subject's blood oxygen saturation and pulse rate as bioinformation BI every few tens of seconds, just as during bathing. Then, the biosensor 20 transmits the bioinformation BI to the mobile terminal 40 every time it measures the bioinformation BI. Then, every time the mobile terminal 40 receives the bioinformation BI, it transmits the bioinformation BI to the server 50 via the second communication unit.

[0082] The server 50 executes the second acquisition process and the pulse data acquisition process when 30 minutes have passed since the end of bathing. In other words, the server 50 acquires the subject's blood oxygen saturation and pulse rate during the second measurement period, which is at least a part of the period from when the end of bathing is determined to when the start of bathing is determined. As described above, the second measurement period is the period from when the end of bathing is determined to when the power of the biosensor 20 is turned off. Therefore, unless the power of the biosensor 20 is turned off within 30 minutes, the second measurement period includes the 30 minutes that are a predetermined time after the end of bathing is determined in the bathing determination process. Specifically, in the second acquisition process, the server 50 extracts the bioinformation BI of the subject during the second measurement period that is closest to the timing 30 minutes after the end of bathing is determined. Then, in the second acquisition process, the server 50 acquires the blood oxygen saturation included in the extracted bioinformation BI as the second oxygen saturation.

[0083] Furthermore, in the bathing determination process, the server 50 acquires the pulse rate a predetermined time after the end of bathing has begun as the post-bathing pulse rate. The predetermined time is 10 minutes. In other words, the predetermined time is included in the second measurement period. Specifically, in the pulse data acquisition process, the server 50 extracts the biometric information BI of the subject during the second measurement period that is closest to the timing 10 minutes after the end of bathing has been determined. Then, in the pulse data acquisition process, the server 50 acquires the pulse rate included in the extracted biometric information BI as the post-bathing pulse rate.

[0084] The server 50 executes a determination process. The server 50 determines whether the value obtained by subtracting the first oxygen saturation level from the second oxygen saturation level is equal to or less than a predetermined value set within a range of 3% to 4%. The predetermined value is, for example, 3.5%. In other words, the server 50 determines whether the first condition is satisfied.

[0085] Furthermore, the server 50 determines whether the post-bathing pulse rate is greater than the pre-bathing pulse rate by a predetermined reference value or more. In other words, the server 50 determines whether the second condition is met.

[0086] In the determination process, the server 50 determines that the subject's heart failure condition has worsened if both the first condition and the second condition are satisfied. In addition, in the determination process, the server 50 determines that the subject's heart failure condition has not worsened if either or both of the first condition and the second condition are not satisfied.

[0087] The server 50 executes an output process. The server 50 executes the output process by outputting the determination result of the determination process to the mobile terminal 40. For example, if the determination result is "the subject's condition of heart failure has worsened," the server 50 transmits a first signal to the mobile terminal 40. Then, upon receiving the first signal, the mobile terminal 40 displays text, an image, etc. indicating that the subject's condition of heart failure has worsened on a display of the mobile terminal 40. Furthermore, upon receiving the first signal, the mobile terminal 40 may display text, an image, etc. indicating that the subject's condition of heart failure has worsened on a display of the mobile terminal 40, along with the text, an image, etc. indicating the above. Furthermore, for example, if the determination result is "the subject's condition of heart failure has not worsened," the server 50 transmits a second signal to the mobile terminal 40. Then, upon receiving the second signal, the mobile terminal 40 displays text, an image, etc. indicating that the subject's condition of heart failure has not worsened on a display of the mobile terminal 40. In the output process, the server 50 also outputs the determination result to the external terminal 60. Similar to the mobile terminal 40, the external terminal 60 outputs the determination result to a display that the external terminal 60 has or a display connected to the external terminal 60.

[0088] <Effects of the second embodiment> (2-1) In the second embodiment, the server 50 determines in the determination process that the subject's condition has worsened due to heart failure if the post-bathing pulse rate is greater than the pre-bathing pulse rate by a predetermined reference value or more. As described above, when the average pre-bathing pulse rate is used as the reference for heart failure patients without readmission and heart failure patients with readmission, the pulse rate 10 minutes after bathing is higher than the reference. Therefore, with the above configuration, the influence of bathing can be taken into account in the determination.

[0089] (2-2) In the second embodiment, the server 50 determines that the subject's condition due to heart failure has worsened if the value obtained by subtracting the first oxygen saturation level from the second oxygen saturation level is equal to or less than a predetermined value set within a range of 3% to 4% in the determination process. This determination allows for a more accurate assessment that the worsening condition due to heart failure is caused by bathing, as described above.

[0090] <Example of change> The above-described first embodiment, second embodiment, and the following modified examples can be implemented in combination with each other within the scope of technical compatibility.

[0091] <Examples of changes to the overall configuration> In the first and second embodiments, the mobile terminal 40 does not have to be owned by the subject. Furthermore, the output destination of the determination result is not limited to a smartphone, and may be any device capable of communication. In other words, the mobile terminal 40 may be replaced by a desktop computer or the like.

[0092] In the first and second embodiments, the communication methods between the biosensor 20, the mobile terminal 40, the server 50, and the external terminal 60 are not limited to those described in the above embodiments. For example, the communication method may be determined by various standards such as IEEE 802.11. Furthermore, the communication method is not limited to wireless communication. For example, the biosensor 20 and the mobile terminal 40 may communicate via a wired connection. Furthermore, the biosensor 20 may not have a communication function with the mobile terminal 40. In this case, for example, the biosensor 20 may be able to communicate with a cradle corresponding to the biosensor 20, and the cradle may be able to communicate with the mobile terminal 40 via a wired connection. In this way, if the biosensor 20 does not have a communication unit for communicating with the mobile terminal 40, the biosensor 20 can be designed to be correspondingly smaller.

[0093] In the first and second embodiments, the biosensor 20 is not limited to a pulse oximeter. The biosensor 20 may be any biosensor capable of measuring blood oxygen saturation and pulse rate. The biosensor 20 may also be capable of detecting other parameters, such as body temperature and respiratory rate, in addition to blood oxygen saturation and pulse rate. Furthermore, the health management system 10 may include multiple biosensors 20, with one biosensor 20 measuring blood oxygen saturation and another biosensor 20 measuring pulse rate. In the first and second embodiments, the term "pulse rate" refers, for convenience, to the number of pulses that can be counted due to cardiac contraction, and includes the heart rate, which is the number of cardiac pulsations.

[0094] In the first and second embodiments, the biosensor 20 may start and end measurement of the bioinformation BI at timings other than when the power is turned on or off. For example, the biosensor 20 may start measuring the bioinformation BI when the server 50 transmits a measurement start signal via the mobile terminal 40. Furthermore, for example, the biosensor 20 may start measuring the bioinformation BI when it is determined in the bathing determination process that the subject has started bathing.

[0095] In the first and second embodiments, the measurement interval of the biosensor 20 is not limited to the examples in the above embodiments. The biosensor 20 may be configured to acquire bioinformation BI at any timing. The biosensor 20 may perform measurement at least once during the first measurement period and at least once during the second measurement period. For example, the server 50 may store blood oxygen saturation data from the second measurement period as a second oxygen saturation level and compare the second oxygen saturation level with a first oxygen saturation level measured on another day. In other words, the second acquisition process and the first acquisition process do not have to be performed on the same day.

[0096] In the first and second embodiments, the biosensor 20 does not have to transmit the biometric information BI to the mobile terminal 40 every time it measures the biometric information BI. The biosensor 20 may store multiple pieces of biometric information BI in a storage unit thereof and transmit the pieces of biometric information BI at predetermined intervals. The same applies to the mobile terminal 40. The mobile terminal 40 may transmit multiple pieces of biometric information BI to the server 50 all at once.

[0097] In the first and second embodiments, the health management system 10 is not limited to one including the biosensor 20, the mobile terminal 40, the server 50, and the external terminal 60. Any of the components in the health management system 10 may be capable of executing the bathing determination process, the first acquisition process, the second acquisition process, the pulse data acquisition process, the determination process, and the output process. Furthermore, these processes may be executed by one component or by different components. For example, in the first embodiment, the biosensor 20 may execute the bathing determination process, the mobile terminal 40 may execute the first acquisition process, the second acquisition process, and the pulse data acquisition process, and the server 50 may execute the determination process and the output process.

[0098] <Example of changes to the bathing detection sensor and bathing determination process> In the first and second embodiments, the bathing detection sensor 30 can be changed as appropriate as long as it can detect that the subject is bathing.

[0099] For example, the bathing detection sensor 30 may be an open / close sensor attached to the bathroom door that can detect whether the bathroom door is open or closed. In this case, the server 50 may determine, in the bathing determination process, whether the subject has started bathing based on the open / close sensor detecting that the bathroom door has switched from an open state to a closed state. Furthermore, in the bathing determination process, the server 50 may determine whether the subject has finished bathing based on the first detection of the open state by the open / close sensor after determining that the subject has started bathing.

[0100] Furthermore, for example, the bathing detection sensor 30 may be a temperature sensor and a humidity sensor installed in the bathroom. In this case, for example, the server 50 may determine the subject's start of bathing based on the fact that the positive change in temperature detected by the temperature sensor is equal to or greater than a predetermined first temperature change and the positive change in humidity detected by the humidity sensor is equal to or greater than a predetermined first humidity change during the bathing determination process. Furthermore, the server 50 may determine the subject's end of bathing based on the fact that the negative change in temperature detected by the temperature sensor is equal to or greater than a predetermined second temperature change and the negative change in humidity detected by the humidity sensor is equal to or greater than a predetermined second humidity change during the bathing determination process. The first temperature change, second temperature change, first humidity change, and second humidity change may be determined based on measurements of the respective changes at the start and end of bathing in an experiment or the like.

[0101] Alternatively, the bathing detection sensor 30 may be an acceleration sensor attached to the subject. For example, the acceleration sensor may be one installed in a wearable device such as a smart watch or smart band. In this case, the server 50 may detect the subject's posture based on the detected value of the acceleration sensor in the bathing determination process, and determine the start and end of the bathing session based on the similarity between the detected posture and a predetermined posture during bathing.

[0102] Furthermore, for example, the bathing detection sensor 30 may be a flow rate sensor attached to the shower. In this case, the server 50 may determine whether the subject has started bathing based on the fact that the flow rate sensor detects a flow rate equal to or greater than a predetermined specified amount during the bathing determination process. Furthermore, the server 50 may determine whether the subject has finished bathing based on the fact that the flow rate sensor detects a flow rate less than the specified amount during the bathing determination process. The specified value may be determined by detecting an appropriate value through experiments, etc.

[0103] Furthermore, for example, the bathing detection sensor 30 may be a microphone installed in the bathroom. In this case, the server 50 may determine that the subject has started bathing based on the microphone detecting the sound of a shower in the bathing determination process. Furthermore, the server 50 may determine that the subject has finished bathing based on the microphone not detecting the sound of a shower for a predetermined period of time after detecting the sound of a shower in the bathing determination process. The shower sound may be detected by analyzing pre-recorded shower sounds and based on the analysis results. Alternatively, the shower sound may be determined to have been detected when the microphone detects a volume above a certain level.

[0104] Furthermore, for example, the bathing determination process may be performed by a configuration other than the bathing detection sensor 30. For example, the bathing determination process may be performed based on the usage status of a water meter, an electricity meter, or a water heater. For example, the subject may input a signal indicating that bathing has started to the mobile terminal 40 when starting to bathe. The subject may also input a signal indicating that bathing has ended to the mobile terminal 40 when finishing input. The mobile terminal 40 may transmit these signals to the server 50, and the server 50 may perform the bathing determination process based on these signals. With the configuration described above, the health management system 10 does not necessarily have to include the bathing detection sensor 30.

[0105] In the first and second embodiments, the human presence sensor serving as the bathing detection sensor 30 may be installed in the anteroom of the bathroom. In this case, as in the above-described embodiments, the server 50 may determine, in the bathing determination process, whether the subject has started bathing based on the human presence sensor going from detecting a person to no longer detecting a person. Furthermore, after determining the start of bathing in the bathing determination process, the server 50 may determine whether the subject has finished bathing based on the human presence sensor going from not detecting a person to detecting a person.

[0106] The bathing determination process may be performed by combining the first and second embodiments and the above-described bathing determination methods. That is, in the bathing determination process, if multiple bathing start conditions are met, the bathing start may be determined.

[0107] The blood oxygen saturation and pulse rate for several tens of minutes after bathing change in a similar manner to those during bathing due to the effects of bathing. Therefore, for example, the server 50 may determine that the subject has finished bathing several tens of minutes after receiving the non-detection signal transmitted by the bathing detection sensor 30. In other words, the subject may be determined to be bathing for several tens of minutes after bathing. In this case, "after a specific time" refers to the time when a specific time has elapsed since the bathing determination process determined that the subject had finished bathing.

[0108] <Example of changes to the first acquisition process> In the first embodiment, the first oxygen saturation level acquired in the first acquisition process is not limited to the example of the above embodiment, as long as it is a value based on the measurement results of the subject's blood oxygen saturation level during the first measurement period. For example, the first oxygen saturation level may be the maximum or minimum value of blood oxygen saturation during the first measurement period. The first oxygen saturation level may also be an instantaneous value at a specific timing during the first measurement period. The first oxygen saturation level may also be the latest value of blood oxygen saturation acquired during the first measurement period. The first oxygen saturation level may also be a value obtained by performing statistical processing other than averaging blood oxygen saturation. This is also true for the second embodiment.

[0109] In the first and second embodiments, the timing of executing the first acquisition process is not limited to the examples of the above embodiments. For example, the server 50 may store the biometric information BI transmitted from the mobile terminal 40 and execute the first acquisition process at a predetermined time by calculating the average blood oxygen saturation level during the first measurement period. Furthermore, if the first oxygen saturation level is the latest blood oxygen saturation level of the subject during the first measurement period, the first acquisition process may be executed each time the biometric information BI is received from the mobile terminal 40.

[0110] In the first and second embodiments, the first measurement period is not limited to the entire bathing period from when the bathing start is determined to when the bathing end is determined, but may be only a part of the bathing period from when the bathing start is determined to when the bathing end is determined.

[0111] <Example of changes to the second acquisition process> In the first embodiment, the second oxygen saturation level acquired in the second acquisition process is not limited to the average blood oxygen saturation level of the subject during the second measurement period. The second oxygen saturation level may be the maximum or minimum blood oxygen saturation level during the second measurement period. The second oxygen saturation level may also be an instantaneous value at a specific timing during the second measurement period. The second oxygen saturation level may also be the latest blood oxygen saturation level acquired during the second measurement period. The second oxygen saturation level may also be a value obtained by performing statistical processing other than the average blood oxygen saturation level. The second oxygen saturation level may also be a fixed value derived from the subject's blood oxygen saturation level during the second measurement period. This is also true in the second embodiment.

[0112] In the first and second embodiments, the second measurement period may be the entire bathing period from when it is determined that bathing has ended to when it is determined that bathing has started. In other words, the second measurement period may be the entire period excluding the first measurement period.

[0113] In the first and second embodiments, the timing of executing the second acquisition process is not limited to the examples of the above embodiments. For example, the server 50 may store the biometric information BI transmitted from the mobile device 40 and execute the second acquisition process at a predetermined time by calculating the average blood oxygen saturation level during the second measurement period. Furthermore, if the second oxygen saturation level is the latest blood oxygen saturation level of the subject during the second measurement period, the second acquisition process may be executed every time the biometric information BI is received from the mobile device 40.

[0114] <Example of changes to pulse data acquisition process> In the first and second embodiments, the pulse rate acquired in the pulse data acquisition process may be acquired during either a period when the subject is bathing or not bathing.

[0115] In the first embodiment, the first pulse rate acquired in the pulse data acquisition process is not limited to the average pulse rate of the subject during the first measurement period. The first pulse rate may be the maximum or minimum pulse rate during the first measurement period. The first pulse rate may also be an instantaneous value at a specific timing during the first measurement period. The first pulse rate may also be the latest pulse rate value acquired during the first measurement period. The first pulse rate may also be a value obtained by performing statistical processing other than averaging the pulse rate. This also applies to the second pulse rate. The same also applies to the pre-bathing pulse rate and post-bathing pulse rate in the second embodiment.

[0116] In the first embodiment, the timing of executing the pulse data acquisition process is not limited to the example of the above embodiment. For example, the server 50 may store the biometric information BI transmitted from the mobile terminal 40 and execute the pulse data acquisition process at a predetermined time by calculating the average pulse rate during the first measurement period as the first pulse rate. Furthermore, if a representative value such as the first pulse rate is used as the latest value of the subject's blood oxygen saturation, the pulse data acquisition process may be executed every time the biometric information BI is received from the mobile terminal 40.

[0117] <Example of change in judgment process> In the first and second embodiments, the determination process is not limited to the examples of the above embodiments, as long as it determines the subject's condition based on the first oxygen saturation value, the second oxygen saturation value, and changes in pulse rate. That is, the first and second conditions described in the first and second embodiments are not limited to the examples of the above embodiments. Furthermore, the determination process may be performed by combining multiple conditions related to the first and second oxygen saturation values ​​and multiple conditions related to changes in pulse rate.

[0118] Furthermore, the "change in pulse rate" is not limited to a comparison between the first pulse rate and the second pulse rate, or a comparison between the pulse rate before bathing and the pulse rate after bathing, but may be a change in pulse rate at at least two arbitrary timings. For example, the "change in pulse rate" may be a comparison between the maximum and minimum pulse rates measured during bathing, or the amount of change in pulse rate at an arbitrary time.

[0119] In the first embodiment, the value of the first threshold is not limited to the example in the above embodiment. The first threshold may vary depending on each subject and the subject's physical condition, situation, etc. Therefore, it is preferable that the first threshold be set individually for each subject or depending on the subject's physical condition, situation, etc. The same applies to the second threshold.

[0120] In the second embodiment, the specified time is not limited to 10 minutes. In the second embodiment, the specific time is not limited to 30 minutes. In the first embodiment, the timing of executing the determination process is not limited to the example of the above embodiment. For example, the server 50 may execute the determination process at a predetermined time. Also, in the first embodiment, if the first oxygen saturation level, the first pulse rate, and the like are the latest values, the determination process may be executed each time the first acquisition process and the pulse data acquisition process are executed. With this configuration, the subject's condition based on heart failure can be determined in real time.

[0121] In terms of determining the subject's condition based on heart failure, the determination process may be performed based only on the first oxygen concentration value and the second oxygen concentration value. That is, the determination process does not necessarily require a determination based on a change in pulse rate. Furthermore, the pulse data acquisition process does not necessarily require a determination.

[0122] <Example of changing output processing> In the first and second embodiments, the server 50 may execute the output process only for the mobile terminal 40 or only for the external terminal 60.

[0123] In the first and second embodiments, the server 50 may output the biometric information BI together with the determination result. In the first and second embodiments, the output destination of the output process is not limited to the examples of the above embodiments, as long as it is a device capable of outputting the determination result of the determination process. For example, the output destination may be an alarm that notifies by at least one of sound, vibration, and light. Note that light notification includes the display of images and text on a display. Note that the owner of the output destination device does not matter. Furthermore, the output destination is not limited to devices with a notification function. It is sufficient that the server 50 can confirm that the output has been made to any device.

[0124] In the first and second embodiments, the mobile terminal 40 that receives a signal through the output process may notify the determination result by sound, vibration, etc. Furthermore, the mobile terminal 40 may output the determination result by one or more of sound, light, and vibration.

[0125] In the first and second embodiments, the timing at which the output process is executed is not limited to the examples of the above embodiments. For example, the server 50 may store the determination result in a storage unit and execute the output process at a predetermined timing. Similarly, the mobile terminal 40, which receives a signal transmitted by the output process, may display the determination result at a predetermined timing.

[0126] <Additional Notes> The technical ideas that can be understood from the above-described embodiment and modified examples will be described. [1] A health management system that executes a bathing determination process that determines when a subject starts bathing and when he or she finishes bathing; a first acquisition process that defines at least a portion of the bathing period from when the start of bathing is determined in the bathing determination process to when the end of bathing is determined as a first measurement period, and acquires the measurement result of the subject's blood oxygen saturation during the first measurement period as a first oxygen saturation; a second acquisition process that defines at least a portion of the non-bathing period from when the end of bathing is determined in the bathing determination process to when the start of bathing is determined as a second measurement period, and acquires the subject's blood oxygen saturation during the second measurement period as a second oxygen saturation; a pulse data acquisition process that acquires the subject's pulse rate; a determination process that determines the subject's condition based on heart failure based on the value of the first oxygen saturation, the value of the second oxygen saturation, and changes in the pulse rate; and an output process that outputs the determination result of the determination process.

[0127] [2] A health management system as described in [1], which determines that the subject's heart failure condition is worsening when the first oxygen saturation value is smaller than the second oxygen saturation value and the difference between the first oxygen saturation value and the second oxygen saturation value is greater than or equal to a predetermined first threshold.

[0128] [3] The health management system according to [2], wherein the first threshold is a value set within the range of 4% to 8%. [4] A health management system according to any one of [1] to [3], wherein in the pulse data acquisition process, the pulse rate during the first measurement period is acquired as a first pulse rate, and the pulse rate during the second measurement period is acquired as a second pulse rate, and in the judgment process, if the first pulse rate is greater than the second pulse rate by a predetermined second threshold or more, it is judged that the subject's heart failure condition is worsening.

[0129] [5] A health management system described in any one of [1] to [4], wherein in the pulse data acquisition process, the pulse rate in the pre-bathing period before the start of bathing is determined in the bathing determination process is acquired as the pre-bathing pulse rate, and the pulse rate after a predetermined specified time has passed since the end of bathing was started in the bathing determination process is acquired as the post-bathing pulse rate, and in the determination process, if the post-bathing pulse rate is greater than the pre-bathing pulse rate by a predetermined standard value or more, it is determined that the subject's heart failure condition has worsened.

[0130] [6] A health management system according to any one of [1] to [5], wherein the second measurement period includes a timing that is a predetermined specific time after the end of bathing is determined in the bathing determination process, the second oxygen saturation is the subject's blood oxygen saturation at the timing that is the specific time, and in the determination process, if the value obtained by subtracting the first oxygen saturation from the second oxygen saturation is equal to or less than a predetermined value set within the range of 3% or more and 4% or less, it is determined that the subject's heart failure condition is worsening.

[0131] [7] The health management system according to any one of [1] to [6], wherein the output process is executed by outputting the determination result of the determination process to a mobile terminal. [8] In the bathing determination process, a human presence sensor installed in the bathroom determines whether the subject has started bathing based on the detection of a person, and after determining that the subject has started bathing, determines that the subject has finished bathing based on the fact that the human presence sensor no longer detects a person. A health management system described in any one of [1] to [7].

[0132] [9] In the bathing determination process, a human presence sensor installed in the anteroom of the bathroom determines whether the subject has started bathing based on whether it has gone from detecting a person to no longer detecting a person, and after determining whether the subject has started bathing, a health management system described in any one of [1] to [8] determines whether the subject has finished bathing based on whether the human presence sensor has gone from not detecting a person to detecting a person.

[0133]

[10] In the bathing determination process, an open / close sensor attached to the bathroom door and capable of detecting the open and closed states of the bathroom door determines whether the subject has started bathing based on the detection of a change from the open state to the closed state, and after determining the start of bathing, determines whether the subject has finished bathing based on the first detection of the open state by the open / close sensor.

[0134]

[11] A health management system described in any one of [1] to

[10] , in the bathing determination process, the start of bathing of the subject is determined based on the fact that the positive change in temperature detected by a temperature sensor installed in the bathroom becomes equal to or greater than a predetermined first temperature change and the positive change in humidity detected by a humidity sensor installed in the bathroom becomes equal to or greater than a predetermined first humidity change, and the end of bathing of the subject is determined based on the fact that the negative change in temperature detected by the temperature sensor becomes equal to or greater than a predetermined second temperature change and the negative change in humidity detected by the humidity sensor becomes equal to or greater than a predetermined second humidity change.

[0135]

[12] A health management system described in any one of [1] to

[11] , in which the bathing determination process detects the posture of the subject based on the detection value detected by an acceleration sensor attached to the subject, and determines the start and end of bathing of the subject based on the similarity between the posture and a predetermined posture during bathing.

[0136]

[13] A health management system described in any one of [1] to

[12] , in which the bathing determination process determines whether the subject has started bathing based on the detection of the sound of a shower by a microphone attached to the bathroom, and determines whether the subject has finished bathing based on the fact that the microphone does not detect the sound of a shower for a predetermined period of time after detecting the sound of the shower.

[0137]

[14] A health management method in which a computer executes a bathing determination process to determine when a subject starts bathing and when he or she finishes bathing; a first acquisition process to set at least a portion of the bathing period from when the start of bathing is determined in the bathing determination process to when the end of bathing is determined as a first measurement period and acquire the measurement result of the subject's blood oxygen saturation during the first measurement period as a first oxygen saturation; a second acquisition process to set at least a portion of the non-bathing period from when the end of bathing is determined to when he or she starts bathing as a second measurement period and acquire the subject's blood oxygen saturation during the second measurement period as a second oxygen saturation; a pulse data acquisition process to acquire the subject's pulse rate; a determination process to make a determination regarding the subject's condition based on heart failure based on the value of the first oxygen saturation, the value of the second oxygen saturation, and changes in the pulse rate; and an output process to output the determination result of the determination process.

[0138]

[15] A health management system that executes a bathing determination process that determines when a subject starts bathing and when he or she finishes bathing; a first acquisition process that defines at least a portion of the bathing period from when the start of bathing is determined in the bathing determination process to when the end of bathing is determined as a first measurement period, and acquires the measurement result of the subject's blood oxygen saturation during the first measurement period as a first oxygen saturation; a second acquisition process that defines at least a portion of the non-bathing period from when the end of bathing is determined in the bathing determination process to when the start of bathing is determined as a second measurement period, and acquires the subject's blood oxygen saturation during the second measurement period as a second oxygen saturation; a determination process that determines the subject's condition based on heart failure based on the value of the first oxygen saturation and the value of the second oxygen saturation; and an output process that outputs the determination result of the determination process. [Explanation of symbols]

[0139] BI...biometric information 10. Healthcare system 20...Biometric sensor 30...Bath detection sensor 40...Mobile device 50...Server 60...External terminal

Claims

1. a bathing determination process for determining when the subject starts bathing and when the subject finishes bathing; a first acquisition process in which at least a part of the bathing period from when the start of bathing is determined to when the end of bathing is determined in the bathing determination process is set as a first measurement period, and the measurement result of the blood oxygen saturation of the subject during the first measurement period is acquired as a first oxygen saturation; a second acquisition process in which at least a part of a non-bathing period from when the bathing end is determined to when the bathing start is determined in the bathing determination process is set as a second measurement period, and the blood oxygen saturation of the subject during the second measurement period is acquired as a second oxygen saturation; a determination process for determining a condition of the subject based on heart failure, based on the first oxygen saturation value and the second oxygen saturation value; an output process for outputting a determination result in the determination process; Run Health management system.

2. In the determination process, When the first oxygen saturation value is smaller than the second oxygen saturation value and the difference between the first oxygen saturation value and the second oxygen saturation value is equal to or greater than a predetermined first threshold, it is determined that the subject's heart failure condition is worsening. The health management system according to claim 1 .

3. The first threshold value is a value determined within a range of 4% to 8%. The health management system according to claim 2 .

4. the second measurement period includes a timing that is a predetermined specific time after the bathing end is determined in the bathing determination process, the second oxygen saturation level is the blood oxygen saturation level of the subject at a timing after the specific time has elapsed; In the determination process, If the value obtained by subtracting the first oxygen saturation level from the second oxygen saturation level is equal to or less than a predetermined value set within a range of 3% to 4%, it is determined that the subject's heart failure condition is worsening. The health management system according to claim 1 .

5. In the output process, The determination result in the determination process is output to a mobile terminal. The health management system according to claim 1 .

6. In the bathing determination process, A human presence sensor installed in the bathroom detects a person and determines whether the subject has started bathing; After determining that the subject has started bathing, the human sensor determines that the subject has finished bathing based on the fact that the human sensor no longer detects a person. The health management system according to claim 1 .

7. In the bathing determination process, A human presence sensor attached to the front room of the bathroom detects a person and then stops detecting a person, and based on this, the subject's start of bathing is determined; After determining that the subject has started bathing, the human sensor determines that the subject has finished bathing based on the fact that the human sensor has detected a person from a state in which the human sensor had not detected a person. The health management system according to claim 1 .

8. In the bathing determination process, An opening / closing sensor attached to the bathroom door and capable of detecting the open and closed states of the bathroom door detects a change from the open state to the closed state, and based on this, the start of bathing by the subject is determined; After determining that the subject has started bathing, the subject is determined to have finished bathing based on the first detection of the open state by the open / close sensor. The health management system according to claim 1 .

9. In the bathing determination process, The positive change in temperature detected by the temperature sensor installed in the bathroom becomes equal to or greater than a predetermined first temperature change. and determining whether the subject has started bathing based on whether a positive change in humidity detected by a humidity sensor installed in the bathroom has reached or exceeded a predetermined first humidity change amount; a negative change in temperature detected by the temperature sensor becomes equal to or greater than a predetermined second temperature change, Furthermore, the end of bathing of the subject is determined based on whether the negative change in humidity detected by the humidity sensor is equal to or greater than a predetermined second change in humidity. The health management system according to claim 1 .

10. In the bathing determination process, The posture of the subject is detected based on the detection value detected by an acceleration sensor attached to the subject, and the start and end of bathing of the subject is determined based on the similarity between the detected posture and a predetermined posture during bathing. The health management system according to claim 1 .

11. In the bathing determination process, determining whether the subject has started bathing based on the detection of a shower sound by a microphone attached to the bathroom; The microphone detects the shower sound and then determines whether the subject has finished bathing based on the fact that the microphone does not detect the shower sound for a predetermined time. The health management system according to claim 1 .

12. The computer a bathing determination process for determining when the subject starts bathing and when the subject finishes bathing; a first acquisition process in which at least a part of the bathing period from when the start of bathing is determined to when the end of bathing is determined in the bathing determination process is set as a first measurement period, and the measurement result of the blood oxygen saturation of the subject during the first measurement period is acquired as a first oxygen saturation; a second acquisition process in which at least a part of a non-bathing period from when the bathing end is determined to when the bathing start is determined in the bathing determination process is set as a second measurement period, and the blood oxygen saturation of the subject during the second measurement period is acquired as a second oxygen saturation; a determination process for determining a condition of the subject based on heart failure, based on the first oxygen saturation value and the second oxygen saturation value; an output process for outputting a determination result in the determination process; Run Health management method.

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