JPH11313804A - Medical telemeter system and method of using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To input a signal to equipment rapidly with simple operation without imposing a burden on a patient even with the change of equipment for processing a bio-signal from a sensor. SOLUTION: A sensor device 1 comprises a sensor part 9 for detecting a bio-signal and a transmitter 6 for converting this bio-signal into a radio signal to transmit it. The transmitter 6 is provided with an electrode slip-off detecting part 12 for detecting electrode slip-off from the output of the sensor part 9, and also transmits an electrode slip-off signal indicating to that effect. A receiver 4 receives the bio-signal transmitted from the transmitter 6, damps or amplifies it in an amplitude adjusting part 25 and supplies it to a bio-signal input part of another equipment through a switch 29 and a connection part 30. The receiver 4 cuts off the switch 29 upon detecting the electrode slip-off signal from the signal transmitted from the transmitter 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical telemeter system for monitoring a patient's condition by mounting electrodes on the patient and a method of using the same.

[0002]

2. Description of the Related Art Conventionally, when monitoring the condition of a patient from an emergency site to a facility such as an emergency room at a transport destination, as shown in FIG. And conversion of input code was necessary.

[0003]

However, the conversion of the sensor and the code at each location in this way imposes a burden on the patient each time, and the time required for the replacement at a critical care site where time is of the essence. Is the problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and has as its object to quickly and simply operate a device for processing signals from a sensor without imposing a burden on a patient. The operation is to allow the signal to be input to the device.

[0005]

According to a first aspect of the present invention, there is provided a system comprising: a sensor unit for detecting a biological signal; and a transmitting unit for transmitting the biological signal from the sensor unit as a wireless signal. Receiving means for receiving a wireless signal transmitted from the sensor device; amplitude adjusting means for adjusting the amplitude of an output signal of the receiving means; and an output signal of the amplitude adjusting means to a biological signal input section of another device. And a connection means for providing.

In such a system, the receiver receives the biological signal sent from the sensor device, adjusts the amplitude, and supplies the adjusted biological signal to the biological signal input section of another device via the connection means.

According to a second aspect of the present invention, in the system according to the first aspect, the amplitude adjusting means adjusts an output signal of the receiving means to substantially the same level as a signal level detected by the sensor unit. Features. As a result, the biological signal of the same level as the signal level detected by the sensor unit is given to the biological signal input unit of another device.

According to a third aspect of the present invention, there is provided a sensor unit for detecting a biological signal, and detecting that the sensor unit cannot detect a biological signal based on a signal output from the sensor unit. A sensor comprising: a first detection unit that outputs an undetected state signal indicating the detected state signal; and a transmitting unit that transmits the undetected state signal from the first detection unit and the biological signal from the sensor unit as a wireless signal. Device, receiving means for receiving a wireless signal transmitted from the sensor device, connecting means for providing an output signal of the receiving means to a biological signal input unit of another device, and And a second detection means for detecting the undetected state signal and transmitting the signal to the other device. In such a system, the biological signal transmitted from the sensor device is transmitted to another device together with the undetected state signal.

According to a fourth aspect of the present invention, in the system according to the third aspect, the second detecting means includes a variable impedance means for changing an impedance when detecting the undetected state signal. Features. As a result, an undetected state is notified to another device by an impedance change.

According to a fifth aspect of the present invention, there is provided a sensor unit for detecting a biological signal, and detecting that the sensor unit cannot detect a biological signal based on a signal output from the sensor unit. A sensor comprising: a first detection unit that outputs an undetected state signal indicating the detected state signal; and a transmitting unit that transmits the undetected state signal from the first detection unit and the biological signal from the sensor unit as a wireless signal. Device, receiving means for receiving a radio signal transmitted from the sensor device, radio wave break detection means for detecting that the radio signal is a radio wave break, and the undetected state signal from the output signal of the receiving means Second detection means for detecting, and control means for controlling to maintain the detection state of the undetected state signal immediately before detecting the radio wave cut-off state based on the output of the radio wave cut-off detection means, Characterized by comprising a receiver having, a. Thus, the detection state of the undetected state signal immediately before the detection of the radio wave cutoff state is maintained.

According to a sixth aspect of the present invention, there is provided a sensor device including a sensor unit for detecting a biological signal, and a transmitting unit for transmitting a biological signal from the sensor unit as a wireless signal, and mounted in different directions. Receiving means for receiving a wireless signal transmitted from the sensor device, and connecting means for providing an output signal of the receiving means to a biological signal input unit of another device. And a receiver. Thereby, the receiving ability of the receiving means is improved.

According to a seventh aspect of the present invention, there is provided a sensor device comprising: a sensor unit for detecting a biological signal; transmitting means for transmitting the biological signal from the sensor unit as a wireless signal; Receiving means for receiving the wireless signal obtained, and connecting means for providing the output signal of the receiving means to the biological signal input unit of a plurality of other devices, and a receiver comprising: In the use method, in order to maintain the sensor device in a state where a biological signal is detected, and to connect and output the output signal of the receiving unit to another different device, the connecting unit of the receiver is connected to another different device. Changing the connection to the device.

According to a eighth aspect of the present invention, in the use method according to the seventh aspect, the receiver adjusts an output signal of the receiving means to a signal level substantially equal to a signal level detected by the sensor section. A step of transmitting a signal having a level substantially equal to a signal level detected by the sensor unit to the different device, which has an amplitude adjusting unit.

The method according to claim 9 is the method according to claim 7 or 8.
The use method according to claim 1, wherein the sensor device detects that the sensor unit is in a state in which a biological signal cannot be detected based on a signal output from the sensor unit, and outputs an undetected state signal indicating that. (1) detecting means;
A transmitting means for transmitting the undetected state signal from the detecting means and the biological signal from the sensor unit as a wireless signal, and the receiving means receives a wireless signal of the undetected state signal, The receiver includes a step of transmitting the undetected state signal to the different other device.

According to a tenth aspect of the present invention, in the use method according to the ninth aspect, the receiver detects that the radio signal is out of radio wave, and the output of the out of radio wave detection means. Control means for controlling to maintain the detection state of the undetected state signal immediately before detecting the radio wave disconnection state based on the radio wave disconnection state. Controlling to maintain the detection state of the undetected state signal immediately before performing, and transmitting the undetected state signal to the other device.

[0016]

FIG. 2 shows the overall configuration of a medical telemeter system according to the present invention. As shown in this figure, a sensor device 1 is mounted on a patient. This sensor device 1
Detects a biological signal, converts the signal into a wireless signal, and sends the signal to the portable patient monitoring apparatus 2. The portable patient monitoring device 2 includes a display device 3 and a receiver 4.
The receiver 4 includes a connector 5A as shown in FIG. 3, and is detachable from the connector 5B of the display device 3. When the connectors 5A and 5B are joined, the display device 3 and the receiver 4 form one box as shown in FIG. FIG. 4 shows the appearance of the display device 7 used as a bedside monitor. The connector 5A of the receiver 4 shown in FIG. 2 is detachable from the connector 8 which is a biological signal input unit of the display device 7. Further, when the connector A cannot be fitted to the connector 8 which is an input unit of another bedside monitor, the connector A may be made detachable using the conversion connector 8a.

FIG. 3 also shows the sensor device 1 on an enlarged scale. The sensor device 1 includes a transmitter 6 and a sensor unit 9.
And the sensor section 9 includes a pair of electrodes 9a and 9b.

FIG. 1 shows the internal configuration of each of the sensor device 1 and the receiver 4. The sensor unit 9 of the sensor device 1 has the above-described configuration, and the transmitter 6 includes a direct current amplifying unit 36, an AC amplifying unit 11, an electrode offset detecting unit 12, a tone oscillating unit 13, an adding circuit 14, a modulating unit 15, and a transmitting unit. And a power supply unit 18.

The AC amplifier 11 is a circuit that amplifies the potential of the pair of electrodes 9a and 9b of the sensor 9, and amplifies a signal of 0.05 to 100 Hz regarded as a biological signal.

The electrode offset detecting unit 12 includes a DC amplifying unit 36
Is a circuit for detecting the state of the electrode separation from the output signal of FIG. That is, when the electrode mounted on the subject is detached, the contact resistance between the subject and the electrode increases, or when the polarization voltage between the subject and the electrode becomes excessive, this is detected. For example, as described in JP-A-6-269417, when the output signal of the DC amplifier 36 exceeds a set value, a signal indicating that fact is output. Further, for example, a method described in Japanese Utility Model Publication No. 62-10875 may be used. The signal indicating the electrode separation is generated by the tone oscillator 13.
Is a control signal for outputting a signal having a predetermined frequency of 320 Hz.

The addition circuit 14 is a circuit for adding the output signal of the AC amplification section 11 and the output signal of the tone oscillation section 13.

The modulation section 15 is a circuit that modulates a carrier signal in accordance with the output signal of the addition circuit 14, and the transmission section 16 is a circuit that converts the output signal of the modulation section 15 into a radio signal and transmits the radio signal from the antenna 17. The power supply unit 18 is a battery and supplies necessary power to each of the above units. Further transmitter 6
Includes a battery exhaustion detection unit 12a and a tone oscillation unit 13a. When the dead battery detector 12a detects that the battery of the power supply 18 is dead, the tone oscillating unit 1 outputs a signal indicating that.
The tone oscillating unit 13a outputs a signal having a frequency of 540 Hz. The addition circuit 14 also adds this signal.

Here, the electrode shift detecting section 12 and the tone oscillating section 13 constitute a first detecting section, and the AC amplifying section 11, the adding circuit 14, the modulating section 15, the transmitting section 16 and the antenna 17 constitute the transmitting section. Constitute.

Next, the receiver 4 will be described. Receiver 4
Is an antenna 21, a receiving unit 22 that receives a radio signal via the antenna 21, a demodulating unit 23 that demodulates a signal received by the receiving unit 22, and 0.
A BPF (bandpass filter) 24 for extracting a signal of 0.5 to 100 Hz, an amplitude adjusting unit 25 for attenuating or amplifying an output signal of the BPF 24, a BPF 26 for extracting a signal of 320 Hz from an output signal of the demodulation unit 23, and a BPF.
A rectifying detector 27 for rectifying and detecting the output signal of the comparator 26; a comparator 28 for determining whether the output signal of the rectifying detector 27 has exceeded a set threshold; and a case where the comparator 28 determines that the signal has exceeded the threshold. A switch 29 including a pair of switching units 29a and 29b that are simultaneously switched by a switching signal output to the switch 29, and a connection that is connected to output terminals of the switching units 29a and 29b of the switch 29 and connected to a connection unit of another device. And a power supply unit 31. The power supply unit 31 is a battery and supplies necessary power to the above-described units.

The output signal of the amplitude adjusting section 25 reaches one terminal of the switching section 29a of the switch 29. The connection unit 30 includes a connector 5A including three pins, of which the + pin is connected to the other terminal of the switching unit 29 a of the switch 29, and the − pin is one terminal of the switching unit 29 b of the switch 29. , And the ground pin is connected to the other terminal of the switching section 29b of the switch 29. Also, a pair of switching units 2 of the switch 29
9a and 29b are normally closed when there is no switching signal from the comparator 28. Also, the switching unit 29a,
29b may use an analog switch using a semiconductor, a relay, or a photo switch using light. In this description, a pair of the switching units 29a and 29b is used, but a configuration using only one of the switching unit 29a and the switching unit 29b may be used.

The amplitude adjustment unit 25 attenuates or amplifies the signal demodulated by the demodulation unit 23 as described above. The degree of attenuation or amplification is determined by the weak biological signal directly obtained from the biological electrode. It is at the level of the signal amplitude.

The receiver 4 has a radio wave cutoff detecting unit 22a for detecting whether or not the signal transmitted from the transmitter 6 is received by the receiving unit 22, and the radio wave cutout detecting unit 22a detects the radio wave cutout. Alarm 100a that issues an alarm when
It has. Further, the receiver 4 includes a BPF 26a that extracts a signal of 540 Hz from the output signal of the demodulation unit 23,
Rectifier detector 27a for rectifying and detecting the output signal of PF 26a
A comparator 28a that determines whether the output signal of the rectifier detector 27a has exceeded a set threshold, and an alarm 100b that issues an alarm based on a signal output when the comparator 28a determines that the signal has exceeded the threshold. ing. The receiver 4 further includes a dead battery detection unit 31a that detects a dead battery of the power supply unit 18 and an alarm 100c that issues an alarm when the dead battery detection unit 31a detects that the battery is dead.
The receiver 4 further includes an alarm 100d that issues an alarm based on a switching signal output from the comparator 28 to the switch 29.

Here, the antenna 21, the receiving section 22, the demodulating section 23 and the BPF 24 constitute a receiving means, and the BPF 2
6. The rectifying detector 27, the comparator 28, and the switch 29 constitute a second detecting unit, the amplitude adjusting unit 25 constitutes an amplitude adjusting unit, and the connecting unit 30 constitutes a connecting unit.

Next, the operation of the thus configured telemeter system will be described. First, when the patient can move freely, the ECG signal is monitored by the display device 3 of the portable patient monitor 2 shown in FIG. 2, and then the ECG signal is displayed by the display device 7 of the bedside monitor. The case of monitoring will be described.

The connector 5B of the display device 3 and the connector 8 of the display device 7 are provided as connection portions (biological signal input portions) for obtaining signals from electrodes mounted on the patient via cords. Things. Further, the display device 3,
The display device 7 is provided with a means for detecting electrode disconnection based on signals input from the connector 5B and the connector 8, and a means for issuing an alarm when such detection is detected.

First, the sensor device 1 is mounted on a patient. That is, the pair of electrodes 9a and 9b of the sensor device 1 are mounted on the patient, and the power switch (not shown) of the transmitter 6 is turned on. Here, the connector 5A and the connector 5B are connected as shown in FIG. 3, and the receiver 4 is mounted on the display device 3 and is in the state shown in FIG. The power switch (not shown) of the receiver 4 is also turned on.

In this state, in the sensor device 1, the electrocardiogram signal obtained from the electrodes 9a and 9b is
Is amplified by the AC amplifying unit 11 and reaches the adding circuit 14. At this time, since the electrode shift detecting unit 12 has not detected the electrode shift, the adding circuit 14 outputs the signal provided from the AC amplifying unit 11 to the modulating unit 15 as it is. Modulating section 15 modulates the carrier signal based on the signal, and outputs this to transmitting section 16. The transmitting section 16 sends out the modulated wave signal via the antenna 17.

On the other hand, in the receiver 4, the signal transmitted from the transmitter 6 is received by the receiving unit 22 via the antenna 21, and is demodulated by the demodulation unit 23. The signal demodulated at this time is
Because it is an electrocardiogram signal of 0.05 to 100 Hz, BPF2
The signal is extracted by 4, attenuated or amplified by the amplitude adjustment unit 25, and reaches the connection unit 30 via the switch 29. The display device 3 performs display based on this signal. Here, the signal extracted by the BPF 24 is output to the amplitude adjustment unit 2.
Since the signal is attenuated or amplified at 5, the display device 3 obtains a signal of the same level as that provided when the sensor is connected directly via a cord.

Next, when one or both of the electrodes 9a and 9b of the sensor device 1 are detached from the patient, the electrode disengagement detecting section 12 of the transmitter 6 detects the state, and sends a control signal to the tone oscillating section 13 To the tone oscillator 13
Output a 0 Hz signal. Thereby, the addition circuit 14
Is a signal supplied from the AC amplifier 11 to the tone oscillator 1
The signal of 320 Hz output from 3 is added. Modulating section 15 modulates the carrier signal based on the signal, and outputs this to transmitting section 16. The transmitting section 16 sends out the modulated wave signal via the antenna 17.

On the other hand, in the receiver 4, the signal transmitted from the transmitter 6 is received by the receiving unit 22 via the antenna 21, and is demodulated by the demodulation unit 23. Since the demodulated signal contains a tone signal of 320 Hz, the signal is extracted by the BPF 26 and rectified and detected by the rectifying detector 27. Then, the output signal of the rectification detector 27 is compared with a threshold set in the comparator 28. When the comparator 28 determines that it is larger than the threshold value, the comparator 28 outputs a switching signal for opening the pair of switching units 29a and 29b of the switch 29. For this reason, the connection unit 30 is disconnected from the amplitude adjustment unit 25. For the display device 3 connected to the connection unit 30, when the electrodes attached to the patient are directly connected by the cord. The state is the same as when the electrode is detached. The display device 3 performs processing such as detecting an electrode disconnection based on a signal from the receiver 4 and issuing an alarm.

When the electrode 9 is mounted again, the electrode shift detecting unit 12 stops sending the control signal, so that the tone oscillating unit 1
3 stops the transmission of the tone signal, and the output of the adder circuit 14 is only the output signal of the AC amplifier 11. For this reason, in the receiver 4, the output of the BPF 26 disappears, and the comparator 28
No switching signal is sent from the
The switching units 29a and 29b are closed, and the amplitude adjustment unit 25
Is output to the connection section 30. Therefore, the display device 3 displays the electrocardiogram signal again.

Next, it is assumed that the patient returns to the bedside and causes the display device 7, which is a bedside monitor, to monitor the electrocardiogram signal. At this time, remove the receiver 4 from the display 3,
The connector 5 is joined to the connector 8 of the display device 7. In this case as well, similar to the display 3, the same processing is performed as if a signal obtained from the electrode with a code is processed.

Each device of the present system is provided with various alarms. When a voltage drop of the power supply unit 31 of the receiver 4 occurs, the dead battery detection unit 31a detects this and outputs an alarm 1
At 00c, an alarm indicating the necessity of battery replacement is issued.
If the receiving unit 22 cannot detect the radio wave transmitted from the transmitter 6 of the sensor device 1, the radio wave disconnection detecting unit 22a
Outputs a signal to that effect to the alarm 100a, and the alarm 100a issues an alarm indicating that.

When the voltage of the power supply section 18 of the transmitter 6 drops, the battery exhaustion detecting section 12a detects this, and the tone oscillating section 13a outputs a signal of 540 Hz. This signal is transmitted as a radio wave together with the electrocardiogram signal via the addition circuit 14, the modulation unit 15, and the transmission unit 16, and
Is detected via the BPF 26a, the rectifier detector 27a, and the comparator 28a, and an alarm indicating the necessity of battery replacement is issued by the alarm 100b.

Further, as described above, when the electrode displacement is detected by the electrode displacement detection unit 12 of the transmitter 6, the comparator 28 of the receiver 4 outputs a signal to turn off the switch 29. The alarm 100d is reached, which causes the alarm 100d to issue an alarm indicating that the electrode has been disconnected.

As shown in FIG. 10, specific examples of the alarms 100a to 100d may be an LED or a liquid crystal that visually informs, or a buzzer or the like that acoustically informs.

An example in which the present system is used in an emergency scene will be described with reference to FIG. As shown in this figure, first, a sensor device 1 (sensor Z) is mounted on a patient and put on an ambulance. Here, the receiver 4 is attached to the monitor device A in the ambulance, and the monitor device A displays an electrocardiogram. Next, the user arrives at the hospital, removes the receiver 4 from the monitor device A, attaches it to the monitor device B in the ICU, and causes the monitor device B to display an electrocardiogram. Next, the receiver 4 is removed from the monitor device B and goes to the examination room. The receiver 4 is attached to the monitor device C in the room, and the monitor device C displays an electrocardiogram. Next, the receiver 4 is removed from the monitor device C and the monitor device D
The patient is transported in a state where an electrocardiogram is displayed on the monitor device D. Next, the user arrives in the operating room, removes the receiver 4 from the monitor device D, attaches it to the monitor device E in the operating room, and causes the monitor device E to display an electrocardiogram. In this way, no matter how the monitoring device changes at the destination of the patient, the sensor device 1 attached to the patient is installed at each location without removing the patient device and placing no burden on the patient. The ECG is displayed on the monitor device.
If the receiver 5 corresponding to the transmission frequency of the sensor device 1 is connected in advance to each monitor device in the hospital, replacement of the receiver 5 can be omitted.

Next, a second embodiment will be described. This embodiment differs from the first embodiment in the configuration of a transmitter 6A as shown in FIG. That is, a selection switch 35 is provided in place of the addition circuit 14 of the first embodiment, and the AC amplification unit 11 and the modulation unit 15 are normally connected. Then, the electrode displacement detection unit 12 detects the electrode displacement and outputs a control signal. Is output, the connection between the AC amplification unit 11 and the modulation unit 15 is cut off, and the tone oscillation unit 13 and the modulation unit 15 are connected. Here, the AC amplification unit 11, the selection switch 35, the modulation unit 15, the transmission unit 16, and the antenna 17 constitute a transmission unit. Other configurations are the same as those of the first embodiment. Although a means for generating various alarms is omitted, a configuration in which these means are added may be adopted (the same applies to the following embodiments). With such a configuration, the same operation and effect as those of the first embodiment can be obtained.

Next, a third embodiment will be described. This embodiment differs from the first embodiment in the configuration of a transmitter 6B and a receiver 4B as shown in FIG. That is, in the transmitter 6B, instead of providing the tone oscillating unit 13 of the first embodiment, when the electrode shift detecting unit 12B detects the electrode shift, a predetermined DC voltage is added to the adder circuit 1.
4 is given. Electrode displacement detection unit 1
2B is the sensor unit 9 amplified by the DC amplifying unit 36.
The electrode displacement is detected from the output signal.

Here, the electrode offset detecting section 12B constitutes the first detecting means, and includes the DC amplifying section 36, the AC amplifying section 11,
The adding circuit 14, the modulating unit 15, the transmitting unit 16, and the antenna 17 constitute a transmitting unit.

On the other hand, the receiver 4B does not have the BPF 26 and the rectifying detector 27 of the first embodiment, and
Receives the signal from the demodulation unit 23 directly and compares it with a set threshold value (a value lower than the voltage applied to the addition circuit 14 by the electrode displacement detection unit 12). According to the comparison result, the switching units 29a, 29 of the switch 29
Turning on and off 9b is the same as in the first embodiment. Here, the comparator 28 and the switch 29 constitute a second detecting means. Other configurations are the same as those of the first embodiment. According to the present embodiment, in addition to the effect that the entire configuration is simplified, the same operation and effect as those of the first embodiment can be obtained.

Next, a fourth embodiment will be described. In the present embodiment, the detected electrocardiogram signal is digitized and processed. FIG. 8 shows a configuration of the sensor device 1C and the receiver 4C of the present embodiment. As shown in this figure, the sensor device 1C includes a sensor unit 9C and a transmitter 6C. The sensor unit 9C is the same as in each of the above embodiments.
The transmitter 6C includes a DC amplification unit 36 and an AC amplification unit 11 that amplify the output signal of the sensor unit 9C, and an electrode deviation detection unit that detects an electrode deviation from the output signal of the DC amplification unit 36 and outputs a digital signal to that effect. 38, an A / D converter 39 for digitizing an output signal of the amplifier 37, a time-division multiplexing unit 40 for time-division multiplexing the signals from the electrode offset detection unit 38 and the A / D conversion unit 39, A modulating section 41 for modulating a carrier signal with a signal from the time division multiplexing section 40;
A transmitting unit 4 for transmitting a signal from the external device 1 to the outside as a wireless signal
2 and an antenna 43, and a power supply section 44 for supplying necessary power to each section.

Here, the electrode offset detecting section 38 constitutes first detecting means, and the amplifying section 37, the time division multiplexing section 40, the modulating section 41, the transmitting section 42 and the antenna 43 constitute transmitting means.

On the other hand, the receiver 4C includes an antenna 51, a receiving section 52 for receiving a radio signal via the antenna 51,
A demodulation unit 53 that demodulates a signal received by the reception unit 52, a D / A conversion unit 54 that converts an electrocardiogram signal output from the demodulation unit 53 into an analog signal, and attenuates or amplifies an output signal of the D / A conversion unit 54. At the same time, an amplitude adjusting unit 55 to be controlled, an electrode offset signal detecting unit 56 for detecting an electrode offset signal from the signal demodulated by the demodulation unit 53, and a control signal transmitted when the electrode offset signal detecting unit 56 detects the electrode offset signal. A switch 59 having a pair of switching units 59a and 59b for switching, and switching units 59a and 59b of the switch 59;
The power supply unit 61 includes a connection unit 60 connected to one of the terminals and connected to an input unit of another device. The power supply unit 61 is a battery and supplies necessary power to each of the above units.

The output signal of the amplitude adjusting section 55 reaches the other terminal of the switching section 59a of the switch 59. The connection section 60 is provided with a connector composed of three pins as in the above-described embodiments, of which the + side pin is connected to the one terminal of the switching section 59 a of the switch 59 and the − side pin is connected. Is the switching unit 5 of the switch 59
9b, and the ground pin is connected to the other terminal of the switching portion 59b of the switch 59. Also, a pair of switching units 59a, 59 of the switch 59
“b” is always closed when there is no control signal from the electrode disconnection signal detection unit 56.

Here, the antenna 51, the receiving section 52, the demodulating section 53, and the D / A converting section 54 constitute a receiving section, and the electrode-offset signal detecting section 56 and the switch 59 constitute a second detecting section. The adjusting unit 55 constitutes an amplitude adjusting unit, and the connecting unit 60 constitutes a connecting unit.

According to such a configuration, the same operation and effect as those of the above-described embodiments can be obtained, and a digital signal is transmitted and received between the transmitter 6C and the receiver 4C.
It is less susceptible to noise and can monitor ECG signals more accurately.

In each of the above embodiments, the receiver 4,
4B and 4C are connected to various other biological signal input units,
It is necessary to ensure the reception sensitivity in any situation because they are not fixed at a constant position. Therefore, a polarization diversity function is provided to perform more reliable reception, and stable reception is ensured even when connected to various other devices. For example, as shown in FIG.
1b and an antenna switching unit 21c for switching between them, and when the radio wave disconnection detecting unit 22a detects the radio wave disconnection, the antenna switching unit 21c uses the antenna switching unit 21c.
1a and 21b are switched.

An example of the receiver shown in the exploded view of FIG. 12 and the external view of FIG. 13 is a small chip dielectric antenna 21a, 2
1b are mounted in different directions, for example, directions orthogonal to each other, and the ground direction of the circuit board 200a close to the antenna 21a and the circuit board 200 close to the antenna 21b.
housing 4A so that the ground directions of b are orthogonal to each other.
(Composed of a pair of cases 4a and 4b) are arranged so as to protrude from the upper surface and side surfaces thereof, so as to compensate for the directivity of each other.

Here, the small chip dielectric antenna 21a,
21b is a size of about several tenths of the wavelength of the transmission frequency, and is a monopole antenna (a quarter of the wavelength).
Is quite small. Antennas 21a, 21b
Is protected by a cap of a few millimeters to a few centimeters so as not to impair convenience. When such a receiver is adapted to the embodiment shown in FIG.
00a and 200b include a reception unit 22, a demodulation unit 23, and a BP
F26, rectifier detector 27, comparator 28, amplitude adjuster 2
5, switch 29, radio wave disconnection detecting unit 22a, BPF 26
a, a rectifying detector 27a, a comparator 28a, and a dead battery detector 31a.

In each of the above embodiments, the switch 29 (or 59) may be replaced by switches 29c and 29d as shown in FIG. May be created. The switch 29 (or 59) may be switches 29e and 29f that switch the resistance between the amplitude adjusting unit 25 and the connection unit 30, as shown in FIG.
Any configuration may be used as long as it creates a state in which the resistance viewed from the connection section 30 has a high impedance.

When the radio wave from the sensor device 1 stops arriving, the tone signal detected and transmitted by the electrode displacement detection unit 12 of the sensor device 1
The switch 29 (or 59) may be configured as shown in FIG.
That is, the switch 29 (or 59) includes a switching unit 29a, and the switching unit 29a includes a D-type flip-flop 293, an AND circuit 292, and an OR circuit 29.
1 to be controlled by the control circuit. Then, the output of the comparator 28 is made to reach the D input terminal of the D type flip-flop 293, and the output of the radio wave cutoff detecting section 22a is made to reach its clock terminal. The output of the switching unit 29a is connected to the + pin of the connection unit 30. According to this configuration, even if the transmitted tone signal cannot be detected by the BPF 26 of the receiver 4, the signal of the comparator 28 in the state immediately before the radio wave is cut off by the input signal to the D type flip-flop 293 from the radio wave cut-off detection unit 22 a. State can be maintained.

For example, a radio wave from the sensor device 1 reaches the receiver 4, and the tone signal transmitted by the electrode-offset detector 12 of the sensor device 1 is transmitted to the BPF of the receiver 4.
Since the output of the comparator 28 is at the high level in the state that can be detected by the switch 26, the output of the OR circuit 291 is also at the high level, and the switch 29a is open. Then, when the radio wave from the sensor device 1 stops arriving and the tone signal detected by the electrode displacement detection unit 12 of the sensor device 1 cannot be detected by the BPF 26 of the receiver 4, the output of the comparator 28 changes from High. Low level and D type
The signal is input to the flip-flop 293 and the OR circuit 291. At the same time, the output of the radio wave disconnection detection unit 22a changes from low to high level, and the D-type flip-flop 293 is output.
Is input to the AND circuit 292. As a result, the D-type flip-flop 293 inverts from Low to High level, and the output of the AND circuit 292 goes to High level.
The output of the R circuit 291 also becomes High level and the switch 29a
Is in an open state.

As a result, the connection section 30 is disconnected from the amplitude adjustment section 25, and for the display device 3 connected to the connection section 30, the electrodes mounted on the patient are directly connected by a cord. In this case, the state is the same as when the electrode comes off. Also, even if the signal cuts off suddenly,
Since the open state of the switch immediately before the radio wave is cut off can be maintained, the display device 3 can continue to display the electrode detachment state of the sensor device 1.

The radio signal transmitted from the sensor device is set to a frequency that avoids interference with other sensor devices. In addition, it is convenient to color-code a housing for each pair or attach a seal to the housing so that the pair of the sensor device and the receiver can be visually recognized by a user, so that the pair can be identified. . Further, the sensor unit of the sensor device is not limited to an electrode, and may be a sensor that detects other biological signals of the subject, such as a blood pressure and body temperature measurement sensor.

In each of the above-described embodiments, the first detector detects the electrode displacement, and the second detector detects the signal indicating the electrode displacement. However, the present invention is not limited to the electrode displacement, and may detect and process other undetected states in which the sensor unit cannot detect a biological signal.

[0062]

According to the system according to the first and second aspects, the transmission and reception of signals between the sensor device and another device for processing a biological signal detected by the sensor device are performed by radio signals. By simply connecting the receiver to the biological signal input section of the other device, a biological signal can be input to that device. For this reason, even if the device that processes the signal from the sensor device changes, the sensor device worn on the patient is kept as it is, and the biological signal is input to the device by a quick and simple operation without imposing a burden on the patient. be able to.

According to the systems of the third and fourth aspects, when a state occurs in which the sensor device cannot detect a biological signal, the receiver can notify the other device of the occurrence. Therefore, an apparatus having a function of performing a process corresponding thereto can sufficiently exhibit the function.

According to the system of the fifth aspect, it is possible to keep informing other devices of the undetected state even when the radio wave is suddenly cut off in the undetected state.

According to the system of the sixth aspect, it is possible to ensure a good receiving sensitivity of the receiver, and to transmit a biological signal to another device with high accuracy.

According to the method of the seventh and eighth aspects, even if the equipment for processing the signal from the sensor device is changed, the sensor device worn on the patient is kept as it is, without imposing a burden on the patient, quickly and A biological signal can be input to the device with a simple operation.

According to the method of the ninth aspect, when the sensor device cannot detect the biological signal, the receiver can notify the other device of the occurrence.

According to the system of the tenth aspect, it is possible to keep informing other devices of the undetected state even when the radio wave is suddenly cut off in the undetected state.

[Brief description of the drawings]

FIG. 1 is a diagram showing an internal configuration of each of a sensor device and a receiver according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an overall configuration of the first embodiment of the present invention.

FIG. 3 is a view for explaining how to use the system shown in FIG. 2;

FIG. 4 is an explanatory diagram in the case where the system shown in FIG. 2 is used by changing a monitor device.

FIG. 5 is a diagram for explaining a use state of the sensor device and the receiver shown in FIG. 1 in different places.

FIG. 6 is a diagram illustrating a configuration of a sensor device according to a second embodiment of the present invention.

FIG. 7 is a diagram showing the respective configurations of a sensor device and a receiver according to a third embodiment of the present invention.

FIG. 8 is a diagram showing the respective configurations of a sensor device and a receiver according to a fourth embodiment of the present invention.

FIG. 9 is a view for explaining a connection state between a conventional sensor device and a monitor device at different places.

FIG. 10 is a diagram illustrating an appearance of a receiver according to the first embodiment.

FIG. 11 is a diagram showing a main part of a receiver provided with two antennas.

FIG. 12 is an exploded perspective view of a receiver provided with two antennas.

FIG. 13 is an external view of the receiver shown in FIG.

FIG. 14 is a diagram showing another example of the switch 29.

FIG. 15 is a diagram showing still another example of the switch 29.

FIG. 16 is a diagram showing still another example of the switch 29.

[Explanation of symbols]

 1,1C sensor device 4,4B, 4C receiver 6,6A, 6B, 6C transmitter 9 sensor unit 11 AC amplifying unit 12,12B, 38 electrode misalignment detecting unit 13 tone transmitting unit 14 addition circuit 15,41 modulating unit 16 , 42 transmitting unit 17, 21, 43, 51, 21a, 21b antenna 22, 52 receiving unit 23, 53 demodulating unit 24, 26 BPF 25, 55 amplitude adjusting unit 27 rectifying detection 29, 59 switch 28 comparator 30, 60 connection Unit 35 selection switch 37 amplification unit 39 A / D conversion unit 40 time division multiplexing unit 54 D / A conversion unit

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Eihiro Hosaka 1-31-4 Nishi-Ochiai, Shinjuku-ku, Tokyo Inside Japan Photoelectric Industry Co., Ltd.

Claims (10)

[Claims] 1. A sensor device comprising: a sensor unit for detecting a biological signal; a transmitting unit for transmitting a biological signal from the sensor unit as a wireless signal; and transmitting a wireless signal transmitted from the sensor device. Receiving means for adjusting the amplitude of an output signal of the receiving means, and connecting means for providing an output signal of the amplitude adjusting means to a biological signal input section of another device. And a medical telemeter system comprising: 2. The medical telemeter system according to claim 1, wherein said amplitude adjusting means adjusts an output signal of said receiving means to substantially the same level as a signal level detected by said sensor unit. 3. A sensor unit for detecting a biological signal, and an undetected state signal indicating that the sensor unit cannot detect a biological signal based on a signal output from the sensor unit and indicating the state. A first detection unit that outputs, a transmission unit that transmits an undetected state signal from the first detection unit and a biological signal from the sensor unit as a wireless signal,
A receiving device for receiving a wireless signal transmitted from the sensor device; a connecting device for providing an output signal of the receiving device to a biological signal input unit of another device; Second detection means for detecting the undetected state signal from an output signal and sending the signal to the other device;
A medical telemeter system, comprising: a receiver provided with: 4. The medical telemeter system according to claim 3, wherein said second detecting means has a variable impedance means for changing impedance when said undetected state signal is detected. 5. A sensor unit for detecting a biological signal, and an undetected state signal indicating that the sensor unit is in a state where the biological signal cannot be detected based on a signal output from the sensor unit and indicating the state. A first detection unit that outputs, a transmission unit that transmits an undetected state signal from the first detection unit and a biological signal from the sensor unit as a wireless signal,
A receiving device for receiving a radio signal transmitted from the sensor device; a radio wave disconnection detecting device for detecting that the radio signal is a radio wave disconnection; Second detection means for detecting a detection state signal; and control for maintaining the detection state of the undetection state signal immediately before detecting the radio wave cutoff state based on the output of the radio wave cutoff detection means. And a receiver comprising: a medical telemeter system comprising: 6. A sensor device comprising: a sensor unit for detecting a biological signal; and transmitting means for transmitting a biological signal from the sensor unit as a wireless signal; and a plurality of antennas mounted in different directions. A receiver comprising: a receiving unit that receives a wireless signal transmitted from the sensor device; and a connecting unit that supplies an output signal of the receiving device to a biological signal input unit of another device. A medical telemeter system. 7. A sensor device comprising: a sensor unit for detecting a biological signal; a transmitting unit for transmitting a biological signal from the sensor unit as a wireless signal; and a wireless unit for receiving the wireless signal transmitted from the sensor device. A receiving device comprising: a receiving unit for receiving the output signal of the receiving unit to a biological signal input unit of a plurality of other devices; and a receiver comprising: Maintaining the device in a state where the biological signal is detected,
A method of using a medical telemeter system, comprising the step of changing the connection of the connection means of the receiver to another different device in order to connect the output signal of the reception means to another different device and transmit the output signal. 8. The receiver has an amplitude adjusting unit that adjusts an output signal of the receiving unit to a signal level substantially equal to a signal level detected by the sensor unit. The method according to claim 7, further comprising transmitting a signal having a level substantially equal to a signal level detected by the sensor unit. 9. The sensor device according to claim 1, wherein the sensor unit detects that the sensor unit cannot detect a biological signal based on a signal output from the sensor unit, and outputs an undetected state signal indicating the detection. Detecting means, and a transmitting means for transmitting the undetected state signal from the first detecting means and the biological signal from the sensor unit as a wireless signal,
The receiving means receives a radio signal of the undetected state signal,
9. The method according to claim 7, further comprising transmitting the non-detection state signal to the different device. 10. The receiver, comprising: a radio wave break detecting means for detecting that the radio signal is a radio wave break; and the non-detection state signal immediately before detecting a radio wave break state based on an output of the radio wave break detecting means. And control means for controlling so as to maintain the detection state of the radio wave. The detection state of the undetected state signal immediately before detecting the radio wave outage state based on the output of the radio wave outage detection means is maintained. 10. The method according to claim 9, further comprising the steps of: transmitting the non-detection state signal to the other device.