Patient monitor

Abstract

To provide a biological information monitor capable of more accurately grasping an electric wave state than before without complicating its system configuration.SOLUTION: A central monitor includes: a demodulation unit having a plurality of demodulation circuits for individually demodulating a plurality of pieces of biological information transmitted from a plurality of biological information acquisition terminals by radio; an electric field intensity measurement unit for measuring electric field intensity in a medical telemeter band including at least all of target frequency bands of demodulation of the demodulation unit; a storage unit for storing electric field intensity logs with time of the electric field intensity obtained by the electric field intensity measurement unit; and a display unit for displaying the logs.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a biological information monitor that receives biological information transmitted wirelessly, for example, a central monitor. [Background technology]

[0002] Conventionally, central monitors installed in nurse stations at medical institutions have been known as vital sign monitors for monitoring the conditions of multiple patients. The central monitor receives vital sign information (e.g., electrocardiogram, blood pressure, arterial blood oxygen saturation, etc.) of each patient from bedside monitors installed at the bedside of each patient in an intensive care unit, hospital room, etc., and displays it on a screen (see, for example, Patent Document 1). The central monitor can also receive and display vital sign information wirelessly transmitted from a telemeter transmitter worn by the patient.

[0003] In order for the central monitor to collect and display the biological information transmitted wirelessly, it goes without saying that the central monitor must be able to correctly demodulate the biological information transmitted wirelessly.

[0004] Generally, wireless communication between a bedside monitor or a telemeter transmitter (hereinafter referred to as "biometric information acquisition terminal") in a hospital and a central monitor is performed via an antenna installed on the central monitor or an antenna installed in the ceiling of a hallway, etc. Depending on the location of the biometric information acquisition terminal and the wireless propagation environment, the central monitor may not be able to correctly demodulate the biometric information. For example, if the biometric information acquisition terminal is located far from the antenna, or if there is an obstacle between the antenna and the biometric information acquisition terminal that blocks radio waves, or if noise interference occurs, the central monitor may not be able to demodulate the biometric information.

[0005] Conventionally, some central monitors have a maintenance function of measuring the received electric field strength from the biometric information acquisition terminal and displaying the measurement results. For example, if the received electric field strength from the biometric information acquisition terminal is lower than a predetermined threshold, the central monitor displays this information.

[0006] This allows the user of the central monitor to recognize that the biometric information acquisition terminal is not located in an appropriate position to transmit biometric information to the central monitor, i.e., that the biometric information acquisition terminal is located in a location with a poor wireless environment. Using this maintenance function makes it possible to prompt the user to place the biometric information acquisition terminal in an appropriate wireless environment. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-124903 Summary of the Invention [Problem to be solved by the invention]

[0008] Incidentally, radio wave conditions change from moment to moment due to the location of the biometric information acquisition terminal, malfunctions, antenna deterioration, external noise, etc. However, the conventional maintenance function described above is executed for a short period of time using an empty channel that is not monitoring biometric information, and therefore is still insufficient in terms of grasping the radio wave conditions.

[0009] It is possible to install a spectrum analyzer separate from the central monitor to measure the radio wave conditions, but this would result in a more complicated system configuration.

[0010] The present invention has been made in consideration of the above points, and provides a biological information monitor that can grasp radio wave conditions more accurately than conventional monitors without complicating the system configuration. [Means for solving the problem]

[0011] One aspect of the biological information monitor of the present invention is a demodulation unit having a plurality of demodulation circuits for demodulating the plurality of pieces of biometric information wirelessly transmitted from the plurality of biometric information acquisition terminals; a field strength measuring unit for measuring the field strength of a medical telemetry band including at least all frequency bands demodulated by the demodulation unit; a storage unit that stores a log of the electric field strength over time obtained by the electric field strength measurement unit; a display unit that displays the log; Equipped with. [Effects of the Invention]

[0012] According to the present invention, the biological information monitor measures the electric field strength of the medical telemetry band and records and displays the log, allowing the user to understand the past radio wave conditions of the medical telemetry band, including the biological information monitoring channel. As a result, a biological information monitor that can accurately understand the radio wave conditions compared to conventional systems can be realized without complicating the system configuration. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a biological information monitoring system to which a central monitor according to an embodiment is applied. [Figure 2] FIG. 1 is a block diagram showing a configuration of a main part of a central monitor according to an embodiment of the present invention; [Figure 3] Block diagram showing the configuration of the receiving unit [Figure 4] Figure showing an example of biological information displayed on a central monitor [Figure 5] Figure showing an example of the field strength display screen on the central monitor [Figure 6] An example of a trend graph of the total field strength of all receiving channels [Figure 7] An example of a trend graph of field strength for a specific receiving channel DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0015] Fig. 1 is a diagram showing a schematic configuration of a biological information monitoring system to which a central monitor according to the present embodiment is applied. The biological information monitoring system 10 in Fig. 1 is installed in, for example, a hospital.

[0016] A central monitor 100 is provided at the nurse's station, and the central monitor 100 receives the biometric information of each patient wirelessly transmitted from a biometric information acquisition terminal such as a bedside monitor 20 (20-1 to 20-n) or a telemeter transmitter 30-1 to 30-m via antennas AN1, AN2-1, AN2-2, and AN2-3.

[0017] Antennas AN1, AN2-1, AN2-2, and AN2-3 are attached directly to the central monitor 100 or connected to the central monitor 100 via cables. Specifically, antenna AN1 is attached directly to the central monitor 100, and antennas AN2 (AN2-1 to AN2-3) are connected to the central monitor 100 via cables 400. Antenna AN2 is installed, for example, above the ceiling of a hospital corridor.

[0018] The antenna AN2 may be configured using a so-called antenna system or a leaky coaxial cable system. The antenna system uses a whip antenna or the like as an antenna, and antennas AN2-1 to AN2-3 are connected by wire. The leaky coaxial cable system uses leaky coaxial cables as antennas AN2-1 to AN2-3. Antennas AN1 and AN2 may be of any system as long as they comply with the specified low-power radio standard. Furthermore, the number of antennas is not limited to the example shown in FIG. 1.

[0019] In practice, the biological information wirelessly transmitted from the bedside monitor 20 and the telemeter transmitter 30 (i.e., the biological information acquisition terminal) is first received by the antenna AN1 or AN2. In the example of Fig. 1, the biological information transmitted from the telemeter transmitter 30-m is received by the antenna AN1, and the biological information transmitted from the bedside monitors 20-1, 20-n and the telemeter transmitter 30-1 is received by the wired antenna AN2.

[0020] In this way, the vital signs transmitted wirelessly from medical terminals such as the bedside monitor 20 and the telemeter transmitter 30 are received and collected by the central monitor 100 and displayed on the central monitor 100 .

[0021] FIG. 2 is a block diagram showing the configuration of the main part of the central monitor 100 according to this embodiment.

[0022] The central monitor 100 inputs signals received by antennas AN1 and AN2 to the receiving unit 200. The receiving unit 200 demodulates the modulated biological information by performing predetermined wireless processing on the input signals. The receiving unit 200 also has a function of measuring the field strength of radio waves in the medical telemeter frequency band (420 MHz to 450 MHz). The detailed configuration of the receiving unit 200 will be described later.

[0023] Here, we will briefly explain the frequency bands used in medical telemeters. According to the "Operational Regulations for Low-Power Medical Telemeters" established by the Japan Electronics and Information Technology Industries Association (JEITA), 420 to 450 MHz is specified as the frequency band used in medical telemeters. Furthermore, six frequency bands (which can also be called bands) 1 to 6 are allocated within the 420 to 450 MHz range. Each of frequency bands 1 to 6 can be allocated 40, 80, or 120 channels (which can also be called "floors" or "biometric information acquisition terminals"). The spacing between each channel is 12.5 kHz.

[0024] The biological information demodulated by the receiving unit 101 is input to the biological information analyzing unit 110. The biological information analyzing unit 110 forms a biological information waveform and calculates maximum, minimum, and average values ​​from the biological information.

[0025] The output of the biological information analysis unit 110 is input to the display control unit 120 and the alarm control unit 130. The display control unit 120 switches the display based on an operation signal from the operation unit 180. The display control unit 120 displays biological information such as an electrocardiogram, SpO2, and blood pressure on the display unit 140. Furthermore, when an alarm output instruction signal is input from the alarm control unit 130, the display control unit 120 displays an alarm on the display unit 140. Furthermore, the alarm output instruction signal from the alarm control unit 130 is also input to an alarm indicator 150 consisting of an LED (Light Emitting Diode), a speaker, etc., and the alarm is output as light or sound.

[0026] Meanwhile, information on the electric field strength of the radio waves measured by the receiving unit 200 is output to the display control unit 120. The electric field strength information here is, for example, information in which the electric field strength is represented by a two-dimensional graph with the horizontal axis representing frequency and the vertical axis representing power (or voltage). This two-dimensional graph is displayed on the display unit 140 by the display control unit 120.

[0027] The central monitor 100 also has a control unit 170, an operation unit 180, and a barcode reader 190. The control unit 170 allocates and links carrier frequencies to each biometric information acquisition terminal based on biometric information acquisition terminal identification information input from the operation unit 180 or the barcode reader 190, and outputs frequency allocation information to the receiving unit 200.

[0028] In addition to this configuration, the central monitor 100 has a storage unit 301. The storage unit 301 records a log of a two-dimensional graph (i.e., a frequency spectrum) with the horizontal axis representing frequency and the vertical axis representing power (or voltage). In other words, the storage unit 301 stores a log of the electric field strength over time. The log stored in the storage unit 301 is displayed on the display unit 140 via the display control unit 120 in response to a user operation.

[0029] This makes it possible to display the changes in field strength (frequency spectrum) over time. As a result, if a user specifies a specific date and time of interest, they can find out the field strength of all channels, including the monitoring channel and its adjacent channels, at that date and time, allowing them to accurately grasp the radio wave environment at a specific date and time.

[0030] The central monitor 100 of this embodiment also has a trend graph creation unit 302. The trend graph creation unit 302 creates a trend graph by expanding, in the time direction, the log of the electric field strength over time stored in the storage unit 301. The trend graph created by the trend graph creation unit 302 is displayed on the display unit 140 via the display control unit 120 in response to a user operation.

[0031] This allows the user to more easily grasp the state of change in field strength over a desired period of time, and as a result, the user can accurately grasp, for example, that interference waves were occurring at a certain date and time.

[0032] FIG. 3 is a block diagram showing the configuration of the receiving unit 200. As shown in FIG.

[0033] The receiver 200 inputs signals received by the antennas AN1 and AN2 to a distributor 230 via a band pass filter (BPF) 210 and an amplifier (AMP) 220.

[0034] Divider 230 outputs the input received signal to demodulator 240 and field strength measurement unit 250. Here, divider 230 may, for example, select either the signal from antenna AN1 or the signal from antenna AN2 and output it to demodulator 240 and field strength measurement unit 250, or may output a combination of the signals from antenna AN1 and antenna AN2 to demodulator 240 and field strength measurement unit 250.

[0035] The distribution of distributor 230 is controlled, for example, by a user operating operation unit 180. As a result, for example, when a user wants to know the field strength based on the signal received by antenna AN1, distributor 230 outputs the signal received by antenna AN1 to field strength measurement unit 250.

[0036] Furthermore, distributor 230 may select which of the received signals from antenna A1 and AN2 to distribute to each of demodulation circuits 1 to 12 included in demodulation unit 240. For example, if telemeter transmitter 30-1 in Fig. 1 is assigned to demodulation circuit 1, the signal from telemeter transmitter 30-1 should be larger at antenna AN2 than at antenna AN1, so distributor 230 should distribute the received signal from antenna AN2 to demodulation circuit 1.

[0037] The demodulation unit 240 has demodulation circuits (which may also be called "receiving modules") equal to the number of beds (which may also be called the "number of channels" or the "number of biometric information acquisition terminals"). In the example of FIG. 3, it has demodulation circuits 1 to 12 for 12 beds. Specifically, each of the demodulation circuits 1 to 12 demodulates the biometric information by multiplying the input signal by a different carrier frequency. For example, demodulation circuit 1 multiplies by carrier frequency 1, demodulation circuit 2 multiplies by carrier frequency 2, ..., and demodulation circuit 12 multiplies by carrier frequency 12.

[0038] The biological information of each bed (each biological information acquisition terminal) demodulated by the demodulation unit 240 is converted by the conversion circuit 270 into data suitable for analysis by the biological information analysis unit 110 (FIG. 2).

[0039] In addition to this configuration, the receiving unit 200 of the central monitor 100 of this embodiment has a field strength measuring unit 250 in addition to the demodulating unit 240 that demodulates the biological information. The field strength measuring unit 250 measures the field strength of the medical telemetry band that includes at least all of the demodulation frequency bands demodulated by the demodulating unit 240.

[0040] The field strength measurement unit 250 of this embodiment measures the field strength in the medical telemetry band using a sweep method. Field strength measurement using a sweep method is a known technique, so it will be briefly described here. The field strength measurement unit 250 converts the input signal to an IF (intermediate frequency) using a mixer and a local oscillator. At this time, the signal is converted to an IF while automatically sweeping the frequency of the local oscillator, and the power value that has passed through a narrowband IF filter is output as field strength information. Note that the field strength measurement unit 250 may measure field strength information using an FFT method instead of the sweep method.

[0041] By measuring and displaying the field strength of radio waves in the medical telemeter band using the field strength measurement unit 250, the user can grasp the radio wave environment of the channel to which the biological information acquisition terminal is assigned.

[0042] The operations of distributor 230, demodulation unit 240, and field strength measurement unit 250 are controlled by wireless control unit 260. For example, wireless control unit 260 controls which of demodulation circuits 1 to 12 to operate based on frequency allocation information from control unit 170. For example, if carrier frequency 1 is assigned to bedside monitor 20-1, carrier frequency 2 is assigned to bedside monitor 20-n, carrier frequency 7 is assigned to telemeter transmitter 30-1, and carrier frequency 9 is assigned to telemeter transmitter 30-m, then demodulation circuits 1, 2, 7, and 9 are operated.

[0043] Moreover, the wireless control unit 260 assigns floors (which may also be called "channels" or "biometric information acquisition terminals") to the demodulation circuits 1-12 by setting carrier frequencies 1-12 for the demodulation circuits 1-12.

[0044] Fig. 4 is a diagram showing an example of biological information displayed on the display unit 140 of the central monitor 100. In the example of Fig. 4, biological information for eight beds is displayed, but with the configuration of Fig. 3 described above, biological information for up to 12 beds can be displayed in relation to wireless reception.

[0045] FIG. 5 is a diagram showing an example of a received field strength display image displayed on the display unit 140 of the central monitor 100. As shown in FIG.

[0046] 5, a field strength measurement selection area AR1, a field strength graph area AR2, a band selection area AR3, an antenna selection area AR4, and a scan start position adjustment area AR5 are displayed. In this embodiment, the display unit 140 has a touch panel configuration, and an operation signal corresponding to a touch operation by the user is input to the control unit 170, and various controls are changed according to the operation signal.

[0047] A "Spectrum analyzer only" button is displayed in the reception strength measurement selection area AR1. When the "Spectrum analyzer only" button is touched, the field strength measurement unit 250 measures the field strength. In addition, buttons RF-01 to RF-12 are displayed in the reception strength measurement selection area AR1. These buttons correspond to demodulation circuits 1 to 12, and when the RF-01 button is touched, for example, the field strength is measured by demodulation circuit 1, and when the RF-02 button is touched, for example, the field strength is measured by demodulation circuit 2.

[0048] That is, the demodulation circuits 1 to 12 have the function of demodulating the biological information and also the function of measuring the field strength of the medical telemeter band, similar to the field strength measurement unit 250. That is, in order to demodulate the biological information, configurations similar to the field strength measurement unit 250, such as a mixer and a local oscillator, are required, and therefore the demodulation circuits 1 to 12 are also able to measure the field strength using these configurations. However, since the demodulation of the biological information in this embodiment is not performed and the field strength measurement unit 250 is provided exclusively for measuring the field strength, the radio wave state of the frequency band of the medical telemeter can be measured regardless of the status of monitoring the biological information.

[0049] The field strength graph area AR2 displays the field strength of each channel. In the example shown, of the six bands that make up the medical telemeter band (1000s, 2000s, 3000s, 4000s, 5000s, and 6000s), the field strength of the 2000s band is displayed. The user can determine which band's field strength to measure and display by selecting the desired band in the band selection area AR3. In the example shown, the field strength of 120 channels is displayed for each band.

[0050] The user can select the antenna for which the field strength is to be measured by touching the antenna selection area AR4. For example, touching the "Antenna 1" button will measure and display the field strength of the signal received by antenna AN1, and touching the "Antenna 2" button will measure and display the field strength of the signal received by antenna AN2. Incidentally, instead of selecting just one antenna, it is also possible to select all two or more antennas and measure and display the field strength of the combined received signal.

[0051] The user can adjust the scan start position for measuring and displaying field strength by touching the scan start position adjustment area AR5. Scanning the field strength of all channels in a band can take several tens of seconds, depending on the device's performance. Therefore, if the scan is simply started from the lowest frequency channel and the channel of interest is a high frequency channel, the user will have to wait a long time to find out the field strength around that channel.

[0052] The user can avoid this inconvenience by touching the scan start position adjustment area AR5. For example, if the channel of interest is channel 2115, the user touches the "110" button in the scan start position adjustment area AR5. As a result, the field strength is measured and displayed in order starting from channel 2110, allowing the user to quickly find out the field strength around the channel of interest, channel 2115.

[0053] Here, the frequency spectrum shown in Fig. 5 is a frequency spectrum for a short period corresponding to the scan period by the field strength measurement unit 250. The central monitor 100 of this embodiment stores frequency spectra for multiple periods in the storage unit 301. This allows the user to display the frequency spectrum for a desired period. This allows the user to know the field strength of all channels, including the monitoring channel and its adjacent channels, for the desired period.

[0054] 6 and 7 are diagrams showing examples of trend graphs created by the trend graph creation unit 302 and displayed on the display unit 140. FIG.

[0055] Fig. 6 is an example of a trend graph of the average field strength of all receiving channels (12 channels in this embodiment) created and displayed by trend graph creation unit 302. Fig. 7 is an example of a trend graph of the field strength of a specific channel (e.g., channel 2) created and displayed by trend graph creation unit 302.

[0056] The top section of Figure 6 displays a long-term trend graph, while the bottom section displays a short-term trend graph. The time span of the trend graph displayed in the top section can be set by the user. In the example shown, the user has selected 1 hour ("1H"), so the time span of the trend graph displayed in the top section is 1 hour. The user can change the time of the trend graph displayed by operating the arrows in the figure.

[0057] Similarly, a long-term trend graph is displayed on the left side of Figure 7, and a short-term trend graph is displayed on the right side. The time span of the trend graph displayed on the right can be set by the user. In the example shown, the user has selected 1 hour ("1H"), so the time span of the trend graph displayed on the right is 1 hour. The user can change the time of the trend graph displayed by operating the arrows in the figure.

[0058] From the trend graph of the average field strength of all receiving channels (12 channels in this embodiment) as shown in Figure 6, the user can infer that the antenna has deteriorated or malfunctioned if, for example, the average field strength on a certain date and time becomes extremely low.

[0059] Furthermore, from the trend graph of the electric field strength of a particular channel (e.g., channel 2) as shown in Figure 7, if the radio waves from a particular telemeter transmitter become weaker at a certain time, for example, the user can infer that the radio wave propagation environment for that telemeter transmitter has deteriorated (e.g., the transmitter has moved away from the antenna).

[0060] As described above, according to this embodiment, the central monitor 100 has a demodulation unit 240 having a plurality of demodulation circuits (demodulation circuits 1 to 12) that demodulate each of a plurality of pieces of biological information wirelessly transmitted from a plurality of biological information acquisition terminals (bedside monitor 20, telemeter transmitter 30), a field strength measurement unit 250 that measures the field strength of the medical telemeter band that includes at least all frequency bands demodulated by the demodulation unit 240, a memory unit 301 that stores a log of the field strength over time obtained by the field strength measurement unit 250, and a display unit 140 that displays the log.

[0061] This allows the user to grasp the past radio wave conditions of channels including the monitoring channel for vital signs, and as a result, a vital signs monitor 100 can be realized that can grasp the radio wave conditions more accurately than conventional ones without complicating the system configuration.

[0062] Furthermore, according to this embodiment, an amplifier 220 that amplifies signals from antennas AN1 and AN2 is provided before the demodulation unit 240 and the field strength measurement unit 250, and the demodulation unit 240 and the field strength measurement unit 250 share the same amplifier 220 (in other words, they input signals from the same amplifier 220). This allows the configuration of the part that amplifies signals to be simplified when viewed as the entire system by the amount of the shared amplifier, compared to, for example, a system in which a field strength measurement unit is provided outside the central monitor 100 to measure field strength.

[0063] Furthermore, according to this embodiment, a distributor 230 that distributes signals from antennas AN1 and AN2 is provided before the demodulator 240 and the field strength measurement unit 250, and the demodulator 240 and the field strength measurement unit 250 share the same distributor 230 (in other words, they receive signals from the same distributor 220). This eliminates the need to provide a separate distributor, as compared to a system in which the field strength measurement unit is provided outside the central monitor 100 to measure the field strength, for example, and therefore simplifies the configuration.

[0064] Incidentally, in this embodiment, the distribution of the antenna signal by distributor 230 to demodulation unit 240 is the same as the distribution of the antenna signal to field strength measurement unit 250. For example, when the signal of antenna AN1 is distributed to demodulation unit 240, the signal of antenna AN1 is also distributed to field strength measurement unit 250. This is because it is meaningless unless the signal of the antenna whose field strength is to be measured is the same as the signal of the antenna to be demodulated.

[0065] The above-described embodiments are merely examples of specific embodiments of the present invention, and the technical scope of the present invention should not be construed as being limited by these embodiments. In other words, the present invention can be embodied in various forms without departing from the gist or main characteristics thereof.

[0066] In the above embodiment, the case where a log of the field strength obtained by the field strength measurement unit 250 is stored has been described, but the field strength may also be measured by the demodulation unit 240 and the log of the field strength may be stored.

[0067] In the above-described embodiment, the present invention is described as being applied to a central monitor, but it is not limited to this. In short, it can be widely applied to any biological information monitor that demodulates and displays multiple pieces of biological information sent wirelessly from multiple biological information acquisition terminals. [Industrial Applicability]

[0068] The present invention has the effect of realizing a biological information monitor that can grasp radio wave conditions more accurately than conventional monitors without complicating the system configuration, and is suitable for use as a central monitor, for example. [Explanation of symbols]

[0069] 10. Biological Information Monitoring System 20(20-1~20-n) Bedside Monitor 30(30-1~30-m) Telemeter Transmitter 100 Central Monitor 110 Biological Information Analysis Department 120 Display control unit 130 Alarm control section 140 Display section 150 Alarm Indicator 170 Control Unit 180 Operation section 190 Barcode Reader 200 Receiver 210 Bandpass Filter (BPF) 220 Amplifier (AMP) 230 Distributor 240 Demodulation Section 250 Electric field strength measurement unit 260 Radio control unit 270 Conversion Circuit 301 Storage section 302 Trend Graph Creation Department AN1, AN2-1, AN2-2, AN2-3 antennas AR1 Field strength measurement selection area AR2 Field Strength Graph Area AR3 Band Selection Area AR4 Antenna Selection Area AR5 Scan start position adjustment area

Claims

1. a demodulation unit having a plurality of demodulation circuits for demodulating the plurality of pieces of biometric information wirelessly transmitted from the plurality of biometric information acquisition terminals; a field strength measuring unit for measuring the field strength of a medical telemetry band including at least all frequency bands demodulated by the demodulation unit; a storage unit that stores a log of the electric field strength over time obtained by the electric field strength measurement unit; a display unit that displays the log; a trend graph creating unit that creates a trend graph of the electric field strength based on the electric field strength over time stored in the storage unit; A vital sign monitor comprising:

2. an amplifier for amplifying a signal from an antenna is provided before the demodulation unit and the field strength measurement unit; The demodulation unit and the field strength measurement unit share the same amplifier. The biological information monitor according to claim 1 .

3. a distributor for distributing a signal from an antenna is provided before the demodulation unit and the field strength measurement unit; The demodulation unit and the field strength measurement unit share the same distributor. The biological information monitor according to claim 1 or 2.

4. A measurement start position in the electric field strength measurement unit can be selected. The biological information monitor according to any one of claims 1 to 3.

5. A frequency band for the log of the electric field strength over time displayed on the display unit can be selected. The biological information monitor according to any one of claims 1 to 3.

Images