JPH11234187A - Multi-channel half-duplex radio communications system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communications system capable of mutual radio communications between a master unit and a slave unit without damaging the compactness of the master unit. SOLUTION: Since transmission from a central monitoring device 12 to some other patient side equipment is not performed within the period of transmission from the central monitoring device 12 to one of the plural pieces of patient side equipment 14 and 16, command signals SO transmitted to the other patient side equipment are not overlapped with the command signals SO transmitted to the patient side equipment by intermodulation inside the receiver of a transmitter-receiver provided in the patient side equipments 14 and 16, and the transmission from the patient side equipment 14 and 16 to the central monitoring device 12 is performed within the reception period of the central monitoring device 12 based on the command signals SO from the central monitoring device 12. Thus, since the transmission is performed from one transmitter- receiver provided in the central monitoring device 12, the reception of the other transmitter-receiver provided in the central monitoring device 12 is not saturated and the mutual radio communication of the central monitoring device 12 and the patient side equipment 14 and 16 is made possible without damaging the compactness of the central monitoring device 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mutual communication system between a central monitoring device (parent device) and a plurality of patient devices (child devices) in a centralized medical monitoring device.

[0002]

2. Description of the Related Art For example, when it is necessary to constantly monitor a patient's condition in a ward or the like, a patient-side device serving as a child unit for monitoring the patient's condition by placing it on the patient's bed side, and a nurse Centralized as a single master unit for centralized monitoring of multiple patients by placing various types of biological information transmitted from each patient's device in one place by placing it in a place where medical staff is resident such as a station A centralized monitoring device including a monitoring device is used. In the patient device, the patient's electrocardiogram, heart rate (pulse rate), blood pressure, respiratory rate,
Biological information such as body temperature is measured and transmitted to the central monitoring device. In the central monitoring device, when the heart rate, the blood pressure value, and the like among the transmitted biological information exceed a preset value, an alarm can be issued to notify the monitoring person of the abnormality.

Usually, the patient side device and the central monitoring device are placed in different rooms, and when connecting the patient side device and the central monitoring device by wiring, complicated wiring work is required. The transmission of biological information from the computer to the central monitoring device is often performed wirelessly.

In such a case where the biological information from the patient device is converted into radio waves and transmitted, it is desired that the central monitoring device also converts the operation command signal into a radio wave and transmits it to remotely control the patient device. In this case, transmission between the central monitoring device and a plurality of patient devices must be performed in a limited frequency range, so that a transmitting / receiving device provided for one patient device and a transmitting / receiving device provided for the central monitoring device are not included. Mutual transmission and reception between a pair of transmission / reception devices is linked by a half-duplex communication system (simplex system) using the same frequency band.

[0005] In the half-duplex communication system, the transmission in the reverse direction cannot be performed while the transmission is being performed from one side to the other. For example, when transmission from the patient device to the central monitoring device is being performed, transmission from the central monitoring device to the patient device cannot be performed. Therefore, it has been considered that the transmission period of the patient device is controlled by the central monitoring device. That is, a transmission command signal is transmitted from the central monitoring device to the patient device, and the patient device transmits the biological information to the central monitoring device for a certain period of time when receiving the transmission command signal.

However, when the transmission period of the patient device is controlled by the central monitoring device as described above, during the period when the central monitoring device is transmitting to one patient device, the central monitoring device is not connected to another patient device. There is a problem that transmission from the device cannot be received. This is because the frequency used between one patient device and the central monitoring device is close to the frequency used between the other patient device and the central monitoring device, and in the central monitoring device, When a radio wave is transmitted from the central monitoring device to one patient side device because the antenna of the transmitting and receiving device that performs transmission and reception with the patient side device is close to the antenna, the radio wave is transmitted to another antenna close to the same central monitoring device. This causes a so-called wraparound in which the reception is saturated.

[0007]

As a method for avoiding this sneak path, it is conceivable to increase the distance between the antennas. However, this would impair the compactness of the central monitoring device. Therefore, it is conceivable that transmission from the central monitoring device to the plurality of patient devices is performed at the same time.While this solves the problem of sneaking around, the receiver circuit provided in the patient device requires an antenna circuit. In circuits before being limited to a band of only one channel, such as a high-frequency amplifier circuit connected to the mixer and a mixer following it, two (or more than two) signals are input, and intermodulation occurs. The signal to be received by the receiver overlaps the signal transmitted to another patient-side device. The problem of such a wireless communication method is that not only the centralized medical monitoring device described above but also a plurality of slave units and a single master unit are provided, and mutual communication between the slave units and the master unit is half-duplex. It exists widely in the case of a communication system.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable wireless communication between a master unit and a slave unit without impairing the compactness of the master unit. It is to provide a possible wireless communication system.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is that a plurality of slave units and a single master unit use a transmitting / receiving device provided on the slave unit and a master unit. A plurality of sets of transmitting and receiving devices are provided in the plurality of slave units and the single master unit, and the mutual transmission and reception between the plurality of sets of transmitting and receiving units is a half-duplex communication system. And the frequency range used in the one set of transceivers is relatively close to, but different from, the frequency range used in the other set of transceivers. In the wireless communication system, a transmission period for transmitting a command signal to one of the plurality of sub units and a transmission period for transmitting a command signal to another sub unit do not overlap each other, and any of the sub units The reception period without transmitting to the A reception period in which the master unit transmits to the plurality of slave units and based on a command signal from the master unit, the master unit does not transmit to any of the slave units. Then, transmission from the slave unit to the master unit is performed.

[0010]

In this manner, during the transmission period from the master unit to one of the plurality of slave units, transmission from the master unit to another slave unit is not performed. Due to the intermodulation in the receiver of the transmitting / receiving device provided in the, the signal transmitted to the child device does not overlap the signal transmitted to the child device, the transmission from the child device to the parent device,
The transmission / reception is performed within the reception period of the master unit based on the signal from the master unit, so that another transmission / reception device included in the master unit is transmitted from one transmission / reception device provided in the master unit. The wireless communication between the master unit and the slave unit can be performed without saturating the reception of the master unit and without impairing the compactness of the master unit.

Here, preferably, the wireless communication system is:
In the master unit, the length of a transmission period to one slave unit of the plurality of slave units is equal to the length of a transmission period to another slave unit of the plurality of slave units, and A plurality of reception periods formed periodically of the machine are transmitted from the master unit to the plurality of slave units so that all of the reception periods have the same length.From the slave unit, based on a command signal from the master unit, The transmission to the master unit is performed for each reception period of the master unit. In this way, there is an advantage that the same program can be used for determining the transmission period in the plurality of slave units, and it is easy to add the slave units.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a centralized medical monitoring apparatus 10 will be described below in detail with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration of a centralized medical monitoring apparatus 10 to which the present invention is applied.

Referring to FIG. 1, a centralized medical monitoring apparatus 10
Is composed of a central monitoring device 12 as a parent device and a plurality (two in this embodiment) of patient side devices 14 and 16 as child devices. The central monitoring device 12 includes a transmission / reception device 18a.
And a transmission / reception device 20a. The transmission / reception device 18a converts a command signal from the central monitoring device 12 into a radio wave and converts the command signal into a radio wave.
The transmission / reception device 20a converts the command signal from the central monitoring device 12 into a radio wave and transmits the radio wave to the transmission / reception device 20b provided in the patient-side device 16.

The transmitting / receiving device 1 provided in the patient device 14
8b receives a command signal from the transmitting / receiving device 18a on the central monitoring device 12, converts a signal from the patient device 14 into radio waves, and converts the signal from the transmitting / receiving device 18a on the central monitoring device 12 side.
Send to a. Similarly, the transmitting / receiving device 20b provided on the patient side device 16 is the transmitting / receiving device 20a on the central monitoring device 12 side.
And converts the signal from the patient-side device 16 into a radio wave and transmits it to the transmission / reception device 20a on the central monitoring device 12 side.

The transmission / reception devices 18a, 18b, 20a,
As the modulation / demodulation scheme used in 20b, various modulation schemes such as an FM modulation scheme such as MSK modulation and an AM modulation scheme can be used. The frequencies used for modulation in the transmitting and receiving devices 18a and 18b and the frequencies used for modulation in the transmitting and receiving devices 20a and 20b are 4
The frequency is a predetermined frequency different from each other within the range of 20 to 430 MHz or 440 to 450 MHz, and the output of the transmitted radio wave is the power corresponding to the specific low power radio station.

Since the usable frequency range is narrow and it is necessary to transmit and receive a plurality of sets in the narrow range, the mutual communication between the transmitting / receiving device 18a and the transmitting / receiving device 18b or the transmitting / receiving device 20a and the transmitting / receiving device 20
b are linked by a half-duplex communication method using the same frequency,
Band used in 8b and transmitting / receiving apparatus 20
Different frequency bands are used for the frequency bands used in a and 20b.

FIG. 2 is a diagram showing an example of the configuration of the central monitoring device 12 and the patient side device 14. First, the configuration of the patient device 14 will be described. Since the patient side device 14 and the patient side device 16 have the same configuration, the patient side device 14 will be described below as an example. In the patient-side device 14, the biological signal detecting device 22 detects a biological signal such as an electrocardiographic induction signal and a pulse wave signal. For example, a cuff or electrode that is attached to a living body and detects a pulse wave or an photoelectric pulse wave The detected biological signal is supplied to the I / O port 23.

The I / O port 23 is connected to the C
PU24, RAM26, ROM28,
The biological signal is supplied to the data bus in accordance with a command from the CPU 24. Then, the CPU 24 stores the biological signal in the ROM 2 in advance while using the temporary storage function of the RAM 26.
By performing processing in accordance with a program (not shown) stored in 8, an electrocardiographic waveform, a blood pressure value,
Biological information such as blood oxygen saturation and heart rate is determined or calculated, and the biological information is stored in the RAM 26 in a biological information data DB.
And is displayed on the display 30. The operation panel 32 is provided on the surface of the patient-side device 14 in order to start / stop measurement of the patient-side device 14 or to operate a predetermined function. When the operation panel 32 is operated, a signal corresponding to the operation is generated. It is supplied to the I / O port 23.

The I / O port 23 is connected to a transmitting / receiving device 18b having a set of a transmitter 34 and a receiver 36, and the biological information data D
B can be wirelessly transmitted to the central monitoring device 12 via the transmitter 34, and the central monitoring device 1
2 can be supplied to the I / O port 23 via the receiver 36. The command signal SO is supplied from the operation panel 32 and a transmission command signal ST for commanding the patient device 14 to transmit the measured biological information data DB for a predetermined period, as described later. And the same operation command signal SC as the signal to be transmitted.

The transmitter 34 is connected to the I / O port 23 via a parallel-to-serial conversion circuit 39, and is connected to the antenna 42 via a transmission / reception switching circuit 40. The receiver 36 is connected to the antenna 42 via the transmission / reception switching circuit 40, and is connected to the I / O port 23 via the serial-parallel conversion circuit 44. On the other hand, a transmission / reception switch 48 for controlling the operation of the transmitter 34 and the receiver 36 is connected. The transmission / reception switch 48 and the transmission / reception switching circuit 40 are operated by a command from the CPU 24. I / O port 2
3, a transmission / reception switching signal SS is supplied. When the transmission / reception switching signal SS is not supplied, both the transmission / reception switching circuit 40 and the transmission / reception switching device 48 are input to the receiver 36, and when the transmission / reception switching signal SS is supplied, both are input to the transmitter 34. Thus, the transmission / reception device 18b is switched between the reception function operation state and the transmission function operation state.

When both the transmission / reception switching circuit 40 and the transmission / reception switching unit 48 are input to the receiver 36 and the receiver 36 is operated, the command signal S from the central monitoring unit 12 is operated.
When O is received via the antenna 42, the command signal SO is demodulated by the receiver 36 and the serial-parallel conversion circuit 44
The command signal SO is converted from serial data to parallel data and supplied to the I / O port 23. On the other hand, the transmission / reception switching signal SS is supplied and the transmission / reception switching circuit 4
When the biological information data DB is supplied to the parallel-serial conversion circuit 39 by a command from the CPU 24 in the operating state of the transmitter 34 in which both the transmission / reception switch 48 and the transmitter 34 are input to the transmitter 34, the biological information data DB Is then converted from parallel data to serial data, modulated by transmitter 34 and transmitted from antenna 42.

The central monitoring device 12 is also connected to the patient side device 14.
CPU 50, RAM 52, ROM 54, I / O similar to
A port 56 and a display 58 are provided.
2. The storage capacity of the ROM 54, the display capacity of the display 58,
Alternatively, the processing capability of the CPU 50 is determined by
It is considered to be superior to the four. Also, transceivers 18a and 20a provided in central monitoring device 12 are provided.
“a” has the same configuration as that of the transceiver 18b.
The operation panel 60 is provided on a surface of the central monitoring device 12 for operating a predetermined function of the central monitoring device 12 or remotely controlling the patient-side device 14.

In the transmission / reception device 18a or the transmission / reception device 20a provided in the central monitoring device 12, when the command signal SO from the CPU 50 is output, the command signal SO is transmitted from the transmitter 34, and the receiver 36 The biological information data DB transmitted from the patient device 14 or the like is received.

FIG. 3 is a flowchart showing a main part of the signal transmission / reception operation of the CPU 50 of the central monitoring device 12, and FIG. 4 is a flowchart showing a main part of the signal transmission / reception operation of the CPU 24 of the patient side devices 14, 16. FIG. 5 is a diagram showing transmission periods of the transmitting / receiving devices 18a and 20a and the transmitting / receiving devices 18b and 20b provided in the central monitoring device 12.

First, the central monitoring device 12 shown in FIG. 3 will be described. In step SA1 (hereinafter, steps are omitted), initialization is performed by inputting "0" to the elapsed time ta. In subsequent SA2, the transmitting / receiving device 18a transmits the command signal SO to the patient-side device 14. Is supplied with a transmission / reception switching signal SS. When the transmission / reception switching signal SS is supplied, the transmission / reception device 18a is set to the transmission function operation state.

In SA3, the command signal SO is output to the transmitting / receiving device 18a in the transmission function operating state.
The command signal SO is, as described above, the transmission command signal S
T and / or operation command signal SC. Command signal S
When O is output, the command signal SO is modulated in the transmitting / receiving device 18a and transmitted to the transmitting / receiving device 18b provided in the patient-side device 14. Ta ₀ point in FIG. 5 shows this state.

When the output of the command signal SO is completed in SA3, the supply of the transmission / reception switching signal SS to the transmission / reception device 18a is terminated in subsequent SA4.
Is set to the receiving function operation state. The transmitting and receiving device 1
Transmission period from 8a is within the period T1 a predetermined, i.e., transmission is started in ta ₀ point is adapted to exit up ta ₁ point. The ta ₀ within a period T1 from time to ta ₁ point, the central monitoring unit 12
No transmission is performed from the other transmitting / receiving devices 20a and the transmitting / receiving devices 18b and 20b provided in the patient-side devices 14 and 16.

At SA5, the elapsed time ta from the initialization at SA1 is set in advance.
It is determined whether or not the transmission start period T2 to the patient device 6 has passed, that is, whether or not it is time to start transmission to the patient device 16. While the determination is denied, the above SA5 is repeatedly executed.
In step SA6, the transmission / reception switching signal SS is supplied to the transmission / reception device 20a in order to transmit the command signal SO to the transmission / reception device 20a. From the end of the supply of the transmission / reception switching signal SS to the transmission / reception device 18a in SA4 to the supply of the transmission / reception switching signal SS to the transmission / reception device 20a in SA6, transmission from the central monitoring device 12 is not performed. , A reception period for receiving transmissions from the patient-side devices 14 and 16.

At SA7, a command signal SO is supplied to the transmitting / receiving device 20a. The command signal SO is transmitted and received by the transmitting / receiving device 20a.
, The command signal SO is modulated and transmitted to the transmitting / receiving device 20b provided in the patient-side device 16.
Ta ₂ point in FIG. 5 shows this state.

When the output of the command signal SO is completed in SA7, the supply of the transmission / reception switching signal SS to the transmission / reception device 20a is terminated in subsequent SA8, and the transmission / reception device 20a is set in the reception function operating state. In addition, this transmitting / receiving device 20a
Is also within the period T1, that is, ta ₂
The transmission is started in time before ta ₃ point is to be terminated. During the transmission period T1 of the central monitoring unit 12 from the ta ₂ point up ta ₃ point, SA4
At the transmission / reception switching signal SS to the transmission / reception device 18a.
Has been completed and the transmission from the transmission / reception device 18a has not been performed, so that a command from the transmission / reception device 20a to the patient side device 16 is generated by the intermodulation in the transmission / reception device 20b provided in the patient side device 16. The command signal SO from the transmitting / receiving device 18a to the patient device 14 does not overlap the signal SO.

At SA9, the elapsed time ta after initialization at SA1 is set in advance.
It is determined whether or not the transmission start period T3 to the P.4 has elapsed, that is, whether or not it is time to start transmission to the patient-side device 14 again. Since the period T3 is a period for judging the end of one cycle of the transmission / reception routine of the central monitoring device 12, transmission to one patient device starts after transmission to one patient device starts. Period T2 until
Is multiplied by the number of patient devices. Therefore, in the present embodiment, the period is twice as long as T2. While the determination at SA9 is denied, SA9 is repeatedly executed. If the determination is affirmed, SA1 and the subsequent steps are repeatedly executed. That is, the elapsed time ta is initialized, and the above processing is repeated. Ta ₄ point in FIG. 5 shows this state. In SA8, the transmitting / receiving device 20
a after the supply of the transmission / reception switching signal SS to the transmission / reception switching signal SS to the transmission / reception device 18a in SA2.
This is a reception period of the central monitoring device 12 in which the transmission from the central monitoring device 12 is not performed until the power supply is supplied.

Next, the signal transmission / reception operation of the patient-side devices 14, 16 in FIG. 4 will be described. The patient device 14
Since the signal transmission / reception operation of the patient device 16 is the same as that of the patient device 16, the patient device 14 will be described here as an example.

First, in SB1, the command signal SO is set to I
By determining whether or not the input has been made via the / O port 23, it is determined whether or not the transmission / reception device 18b has received the command signal SO from the central monitoring device 12. While this determination is denied, the above-described determination of SB1 is repeated, but if affirmed, the elapsed time tb is initialized in the next SB2. Since the time from the initialization of the elapsed time ta on the side of the central monitoring device 12 in SA1 in FIG. 3 to the transmission of the command signal SO to the transmitting / receiving device 18b is relatively short, the elapsed time tb is The point of initialization is the elapsed time ta on the central monitoring device 12 side.
Is almost the same as the time at which is initialized.

At SB3, it is determined whether the command signal SO supplied at SB1 includes the operation command signal SC. The operation command signal SC is transmitted to the central monitoring device 1
2, the information is output based on the fact that the person monitoring the condition of the patient has operated the operation panel 60 of the central monitoring device 12, and includes the activation of blood pressure measurement, the change of alarm settings, and the like. Things.

If the determination at SB3 is affirmative,
In the subsequent SB4, the measurement of the patient-side measuring device 14 is started based on the content of the operation command signal SC, or after the setting is changed, SB5 and the subsequent steps are executed.
However, if the determination at SB3 is negative, SB1
Is supplied to the transmission command signal ST.
Therefore, SB5 and below are directly executed.

At SB5, it is determined whether or not the elapsed time tb of the patient device 14 initialized at SB2 has exceeded the transmission period T1 of the central monitoring device 12. That is, it is determined whether the transmission from the central monitoring device 12 has been completed. When this determination is denied, this SB5 is repeatedly executed, but when denied,
Since transmission from the patient device 14 to the central monitoring device 12 is possible, in the subsequent SB6, the RAM 26
Of the biological information data DB stored in the storage section is compressed. This predetermined section is
It is a section following the section previously transmitted based on the transmission command signal ST last time, and a digital signal representing the shape of the electrocardiographic lead waveform or pulse wave continuous in time series, blood pressure value, blood oxygen saturation, Alternatively, a signal in a predetermined section of the digital signal representing the heart rate is compressed.

At SB7, the transmission / reception switching signal SS is supplied to the transmission / reception device 18b in order to transmit a packet signal SP to be described later to the central monitoring device 12.
The transmission / reception device 18b is set to the transmission function operation state. Then, in SB8, the biological information data DB compressed in SB6 is assembled into a packet signal SP, and the transmission / reception device 1
8b. The packet signal SP is transmitted and received by the transmitting / receiving device 18
b, the packet signal SP is modulated and transmitted to the transmission / reception device 18a provided in the central monitoring device 12. Ta ₁ point in FIG. 5 shows this state.

The packet signal SP is, for example, a series of signals configured as shown in FIG. In the packet signal, a header code signal SH, an alarm signal SA, a biological information data signal SB, and an end code signal SE are sequentially arranged from the top. The above header code signal S
H indicates that the next data exists, and the alarm signal SA indicates that the patient side device 14
This is generated when the biological information value continuously measured in the step S1 exceeds a preset range, and the packet signal SP including the alarm signal SA is transmitted to the central monitoring apparatus 12. In the case, the central monitoring device 12
The side notifies the abnormality of the biological information value by generating an alarm or displaying characters or symbols indicating the abnormality on the monitor screen. The biological information data signal SB is the biological information data DB compressed in SB5. The end code signal SE indicates the end of the packet signal SP.

The packet signal SP is transmitted to the transmitting / receiving device 18b.
And transmitted from the transmitting / receiving device 18b to the central monitoring device 12 must be a period during which transmission from the central monitoring device 12 to any of the patient-side devices 14 and 16 is not performed. , i.e., from ta ₁ time in 5 transmission from the central monitoring unit 12 temporarily ends,
The transmission from the central monitoring apparatus 12 is started again.
Since the length of the packet signal SP in the present embodiment must be within the period up to _two time points, the length of the packet signal SP is equal to or shorter than the difference (T2−T1) between the period T2 and the period T1. Is done. Therefore, at the point of time ta _{2 in} FIG. 5 at which transmission is started again from the central monitoring device 12, the transmission from the transmission / reception device 18 b to the transmission / reception device 18 a on the side of the central monitoring device 12 has been completed, and is provided in the central monitoring device 12. Transmission / reception device 18 by transmission from another transmission / reception device 20a
a does not overlap with the saturation period of the reception of the
The transmission from the transmitting / receiving device 18b provided in the central monitoring device 12 is favorably received by the transmitting / receiving device 18a provided in the central monitoring device 12.

At SB9, it is determined whether or not the elapsed time tb initialized at SB2 has exceeded the period T1 + T2. That is, it is determined whether or not the restarted transmission from central monitoring device 12 has ended. While this determination is denied, the transmission period of the central monitoring device 12 is still in progress, so this SB9 is repeatedly executed. However, if the determination is denied, the transmission of the central monitoring device 12 stops and the patient side Since it is the transmission possible time of the device 14, in the subsequent SB10 to SB11, the SB9 to SB
By performing the same processing as in step 8, the biological information data DB in the predetermined section following the previous time is compressed, then processed into a packet signal SP and supplied to the transmitting / receiving device 18b,
The data is transmitted from the transmission / reception device 18b to the central monitoring device 12. Ta ₃ times in FIG. 5 shows this state.

The length of the packet signal SP output in the SB11 is also set to be equal to the period T2 since the transmission from the transmission / reception device 18b is within the period in which no transmission is performed from the central monitoring device 12. The length is the same as or shorter than the difference (T2−T1) from T1. When the output of the packet signal SP ends at SB11, the supply of the transmission / reception switching signal SS to the transmission / reception device 18b ends at SB12.
8b is a receiving operation state.

The CPU in the other patient-side device 16
The signal transmission / reception operation of the CPU 24 is performed by the CPU of the patient device 16.
When the elapsed time measured at 24 and tc, the elapsed time tc is only in that the time to be initialized is ta ₂ point in FIG. 5 are different, otherwise, the above-described patient-side apparatus 14
Is the same as the signal transmission / reception operation of the CPU 24 in.

As described above, according to this embodiment, during the transmission period from the central monitoring device 12 to one of the plurality of patient devices 14 and 16, the central monitoring device 12 transmits the data to another patient device. The transmission / reception devices 18b, 20b provided in the patient side devices 14, 16 are not transmitted to the side devices.
Command signal SO transmitted to another patient side device does not overlap with the command signal SO transmitted to the patient side device due to the intermodulation in the receiver, and the patient side device 14, 1
6 to the central monitoring device 12
Is performed within the reception period of the central monitoring device 12 based on the command signal SO from the central monitoring device 12, and is provided in the central monitoring device 12 by being transmitted from one transmission / reception device provided in the central monitoring device 12. The central monitoring device 12 and the patient-side devices 14, 1 and 1 do not saturate the reception of other transmitting / receiving devices and do not impair the compactness of the central monitoring device 12.
6 with each other by radio.

Further, according to the present embodiment, the central monitoring device 1
2, the length of the transmission period to the patient device 14 (T
1) and the length of the transmission period to other patient-side devices 16 (T
1) are the same, and the plurality of reception periods periodically formed by the central monitoring device 12 are all the same length (T2-T1).
From the central monitoring device 12 to the plurality of patient devices 1
4 and 16, and from the patient-side devices 14 and 16 to the central monitoring device 12 for each reception period (T2-T1) of the central monitoring device 12 based on the command signal SO from the central monitoring device 12. Was to be sent. Therefore, there is an advantage that the same program can be used to determine the transmission period in the plurality of patient devices 14 and 16, and the number of patient devices can be easily increased.

While the embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other embodiments.

For example, in the above-described embodiment, two patient devices 14 and 16 are provided as child devices, but more devices may be provided. However, it is limited to a range in which a usable frequency band exists. Central monitoring device 12 in this case
The transmission timing of the plurality of patient devices is, for example, transmitted from the central monitoring device 12 to one patient device intermittently at regular intervals, and transmissions from the plurality of patient devices are transmitted from the central monitoring device 12. By the transmission command signal ST,
It is transmitted intermittently at regular intervals as in FIG. That is, in the central monitoring device 12, in the first period T2 in which the elapsed time ta is initialized, transmission to one patient side device and subsequent reception of signals from a plurality of patient side devices are performed. A period equal to the number of patient devices is one cycle, such as transmission to other patient devices during the period and subsequent reception of signals from a plurality of patient devices.

Further, the transmission timing from the central monitoring device 12 and the transmission timing from the patient side devices 14 and 16 are not limited to the above-described embodiment. For example, as shown in FIG. 7, first, the transmission command signal ST is sequentially transmitted from the central monitoring device 12 to different patient devices in different time zones, and the patient device based on the content of the received transmission command signal ST. Then, the elapsed time after receiving the transmission command signal ST may be measured, and the transmission may be delayed until a series of transmissions from the central monitoring device 12 to all the patient devices are completed. In this case, since the period from the reception of the transmission command signal ST to the start of transmission to the central monitoring device 12 differs for each patient device, a different transmission timing program is required for each patient device. , After receiving the transmission command signal ST, the next transmission command signal ST
There is an advantage that it is not necessary to divide and transmit the biological information data DB in one cycle until the information is received.

In addition, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a centralized medical monitoring apparatus 10 to which the present invention is applied.

FIG. 2 is a diagram illustrating an example of a configuration of a central monitoring device 12 and a patient-side device 14.

FIG. 3 is a flowchart showing a main part of a signal transmission / reception operation of a CPU 50 of the central monitoring device 12;

FIG. 4 is a flowchart showing a main part of a signal transmission / reception operation of a CPU 24 of the patient-side devices 14 and 16;

FIG. 5 shows a transmission / reception device 18 provided in the central monitoring device 12.
It is a figure which shows the transmission period of a, 20a and the transmission / reception apparatus 18b, 20b.

FIG. 6 is a diagram illustrating a data format of a packet signal SP transmitted from the patient-side devices 18b and 20b.

FIG. 7 shows a transmission / reception device 18 provided in the central monitoring device 12.
FIG. 6 is a diagram illustrating transmission periods of the transmission periods a and 20a and the transmission / reception devices 18b and 20b, which are different from the transmission periods of FIG.

[Description of sign]

 10: Centralized medical monitoring device 12: Central monitoring device (parent device) 14, 16: Patient device (child device) 18a, 18b, 20a, 20b: transmitting / receiving device

Claims (1)

[Claims] In a plurality of slave units and a single master unit, a set of a transceiver unit provided on the slave unit side and a transceiver unit provided on the master unit side includes the plurality of slave units and the plurality of slave units. A plurality of sets are provided in a single base unit, and mutual transmission and reception between the plurality of sets of transmitting and receiving apparatuses are linked by a half-duplex communication method,
In a multi-channel half-duplex wireless communication system in which the frequency range used in the one set of transmitting and receiving devices and the frequency range used in the other set of transmitting and receiving devices are relatively close but different from each other. A transmission period for transmitting a command signal to one of the plurality of sub units and a transmission period for transmitting a command signal to another sub unit do not overlap each other, and transmission to any of the sub units is not performed. Transmission from the master unit to any of the slave units is performed based on a command signal from the master unit so that no reception period is periodically formed. A multi-channel half-duplex wireless communication system, wherein transmission is performed from the slave unit to the master unit during a reception period that is not performed.