JPH0533123Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to electrocardiographs, particularly portable long-term electrocardiogram recording and analysis devices that record and analyze changes in electrocardiograms in daily life on magnetic tape, so-called Holter electrocardiograms. Regarding the meter.

<Prior art> A Holter electrocardiograph consists of a detection section such as an electrode that is set on the body surface to detect electrocardiographic signals, and a main body that is attached to the subject's belt or the like to record and analyze the detected electrocardiographic signals. However, with wired Holter electrocardiographs, the patient must always carry the main body connected with the cord, which is inconvenient. It is.

As an improvement over this, there is also a wireless telemeter type Holter electrocardiograph that can make the connection between the detection unit such as electrodes and the main body cordless. In this Holter electrocardiograph, the electrocardiogram signal obtained by the detection unit is modulated by a transmission circuit and transmitted as a high-frequency signal, while in the main body, this high-frequency signal is received by a receiving circuit and the electrocardiogram signal is demodulated and recorded. In this wireless telemeter type Holter electrocardiograph, since there is no need for a cord between the detection unit and the main body as described above,
It is extremely convenient as the main body can be easily stored in a clothing pocket, a handbag, etc.

However, when using this wireless telemeter type Holter electrocardiograph especially outdoors,
Depending on the situation, there are times when the influence of external noise cannot be avoided, and in such cases, there is no choice but to use a wired system.

Therefore, when recording electrocardiogram changes while living a normal life using a wireless telemeter type Holter electrocardiograph, wireless transmission,
It is necessary to switch the wired transmission.

With conventional electrocardiogram signals recorded in this way, it is not possible to determine which part was transmitted wirelessly or by wire, so it is difficult to distinguish between noise and other characteristics peculiar to wireless transmission during diagnosis. In order to avoid this, it is necessary to distinguish between wireless transmission and wired transmission using a diary that records the subject's behavior, and to identify the noise peculiar to wireless transmission. , it was troublesome.

<Purpose of the invention> The present invention has been made in view of the above points, and is a method for determining whether a recorded signal is transmitted by wire or wirelessly. The purpose of the present invention is to provide an electrocardiograph that can easily perform the following steps.

<Configuration of the invention> In order to achieve the above-mentioned purpose, the invention includes a detection unit that detects and transmits electrocardiographic signals from a living body;
It consists of a main body that records transmitted electrocardiographic signals,
The detection unit includes an electrode for detecting an electrocardiographic signal, an amplifying circuit that amplifies the electrocardiographic signal from the electrode, and a transmitting circuit that modulates a carrier wave with the electrocardiographic signal from the amplifying circuit and transmits the modulated carrier wave. , an electrocardiograph including a receiving circuit that receives and demodulates radio waves from the transmitting circuit to extract an electrocardiographic signal; and a recording section that records the electrocardiographic signal from the receiving circuit; a first connection terminal to which one end of the cord is connected; a first switching circuit that switches and outputs the electrocardiographic signal from the amplifier circuit to the transmission circuit or the first connection terminal; Detects the presence and when the cord is connected,
The first switching circuit is controlled to transmit the electrocardiogram signal from the amplifier circuit to the main body via the first connection terminal, and when the cord is not connected, the first switching circuit is controlled to transmit the electrocardiogram signal from the amplifier circuit to the main body via the first connection terminal. a first control circuit that wirelessly transmits an electric signal to the main body via a transmission circuit; and a first control circuit that responds to an output of the first control circuit to correspond to wireless transmission or wired transmission when switching between wired transmission and wireless transmission; an identification signal generation circuit that generates an identification signal and transmits it to the main body via the transmission circuit or the first connection terminal; the other end of the cord for transmitting an electrocardiographic signal is connected to the main body; a second connection terminal, and a second switching circuit that switches and outputs an electrocardiographic signal from either the receiving circuit or the second connection terminal to the recording unit;
The presence or absence of the cord connection is detected, and when the cord is connected, the second switching circuit is controlled to output the electrocardiogram signal transmitted by wire through the second connection terminal to the recording unit, and the cord is disconnected. Sometimes, a second control circuit is provided that controls the second switching circuit to output electrocardiographic signals wirelessly transmitted via the receiving circuit to the recording section.

According to the above configuration, by connecting the detection unit and the main body with a cord, the electrocardiographic signal is transmitted by wire, and by removing the cord, the electrocardiographic signal is transmitted wirelessly. When switching to wireless transmission, the corresponding identification signal is transmitted from the detection unit to the main unit and recorded, so it is easy to determine whether the recorded electrocardiogram signal was transmitted wirelessly or by wire. It becomes easier.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.
Explain in detail.

FIG. 1 is a block diagram showing the configuration of a Holter electrocardiograph according to an embodiment of the present invention. It basically consists of a main body 3 that records and analyzes electrocardiographic signals from the detection section 2.

The detection unit 2 includes an electrode 4 for detecting electrocardiographic signals set on the body surface, an amplifier circuit 5 for amplifying the electrocardiographic signal from the electrode 4, and a carrier wave modulated by the electrocardiographic signal from the amplifier circuit 5. and a transmitting circuit 7 for transmitting the high-frequency signal from the antenna 6.

On the other hand, the main body 3 includes a receiving circuit 9 that receives a high frequency signal from a transmitting circuit 7 with an antenna 8 and demodulates an electrocardiographic signal, and a recording analysis section 10 that records and analyzes the electrocardiographic signal from this receiving circuit 9. It is equipped with

The above configuration is basically the same as that of a conventional wireless telemeter type Holter electrocardiograph.

In the Holter electrocardiograph 1 of this embodiment, it is possible to easily transmit electrocardiographic signals by wire, and it is also possible to easily determine whether the recorded electrocardiographic signal was transmitted by wire or wirelessly. It is structured as follows.

The detection unit 2 includes a first connector 12 as a connection terminal to which one end of the cord 11 for electrocardiographic signal transmission is connected, and an electrocardiographic signal from the amplifier circuit 5 to the transmitting circuit 7 or the first connector 12. The first switch output
The presence or absence of connection between the switching circuit 13 and the cord 11 is detected, and based on this, the first switching circuit 13 is controlled to control whether the electrocardiographic signal from the amplifier circuit 5 is transmitted wirelessly or by wire. In addition, a first control circuit 14 outputs a detection signal corresponding to wireless transmission and wired transmission when switching between wired transmission and wireless transmission.
and an identification signal generation circuit 26 that generates an identification signal corresponding to wired transmission or wireless transmission in response to this detection signal. In this embodiment, the first control circuit 14 cuts off the power supply to the transmission circuit 7 and stops its operation during wired transmission in order to suppress power consumption.

The first control circuit 14 controls the first switching circuit 13 to transmit the electrocardiographic signal from the amplifier circuit 5 to the main body 3 via the first connector 12 by wire when the cord 11 is connected, and when the cord 11 is disconnected. Sometimes the first
controlling the switching circuit 13 to wirelessly transmit the electrocardiographic signal from the amplifier circuit 5 to the main body 3 via the transmitting circuit 7;
Furthermore, when switching between wireless transmission and wired transmission, a detection signal corresponding to wireless transmission and wired transmission is given to the identification signal generation circuit 26, and when switching between wired transmission,
The power supply to the transmitting circuit 7 is cut off to stop the operation.

In response to the detection signal from the first control circuit 14, the identification signal generation circuit 26 gives a positive identification signal to the transmission circuit 7 when switching from wired transmission to wireless transmission, and when switching from wireless transmission to wired transmission. , provides a negative identification signal to the first connector 12.

On the other hand, the main body 3 has a second connector 15 as a connection terminal to which the other end of the cord 11 is connected, and an electrocardiographic signal from either the receiving circuit 9 or the second connector 15 is switched and outputted to the recording analysis section 10. detecting the presence or absence of connection between the second switching circuit 16 and the cord 11;
Based on this, the second switching circuit 16 is controlled to output the electrocardiographic signal transmitted by wire through the second connector 15 to the recording analysis section 10 when the cord 11 is connected, and when the cord 11 is not connected, A second control circuit 17 is provided for outputting electrocardiographic signals wirelessly transmitted via the receiving circuit 9 to the recording analysis section 10. In this embodiment, the second control circuit 17:
During wired transmission, in order to suppress power consumption, the power supply to the receiving circuit 9 is cut off to stop its operation.

Next, the operation of the Holter electrocardiograph 1 having the above configuration will be explained.

First, the cord 11 is connected to the first and second connectors 12,
In the state of wireless transmission in which there is no connection between the code 1
1 is not connected, the first switching circuit 13 is controlled to transfer the electrocardiographic signal from the amplifier circuit 5 to the transmitting circuit 7.
The carrier wave is modulated by the transmitting circuit 7 and transmitted from the antenna 6 as a high frequency signal.

The receiving circuit 9 of the main body 3 receives and demodulates this high frequency signal. Since the cord 11 is not connected, the second control circuit 17 controls the second switching circuit 16 to transfer the electrocardiographic signal from the receiving circuit 9 to the recording analysis unit 10.
The electrocardiographic signal is processed by the recording analysis section 10.

Next, when the cord 11 between the first and second connectors 12 and 15 is connected and switched to wired transmission,
The first control circuit 14 cuts off the power supply to the transmission circuit 7 to stop its operation, and also outputs a detection signal corresponding to switching from wireless transmission to wired transmission to the identification signal generation circuit 26, and outputs an identification signal to the identification signal generation circuit 26. The generation circuit 26 generates a negative identification signal and outputs it to the first connector 12. The first control circuit 14 controls the first switching circuit 13 in response to the output of this identification signal, and transfers the electrocardiographic signal from the amplifier circuit 5 to the first connector 1.
Output to 2. As a result, a negative identification signal corresponding to switching from wireless transmission to wired transmission is transmitted, and subsequently an electrocardiographic signal is transmitted. On the other hand, in the main body 3, the second control circuit 17 detects the connection of the cord 11 and the second switching circuit 16
is controlled to output the electrocardiographic signal from the second connector 15 to the recording analysis section 10, and the receiving circuit 9
Cut off the power supply to the

Furthermore, when the cord 11 between the first and second connectors 12 and 15 is removed to switch from wired transmission to wireless transmission, the first control circuit 14 releases the cutoff of power supply to the transmission circuit 7 and starts operation. With,
A detection signal corresponding to the switching from wired transmission to wireless transmission is output to the identification signal generation circuit 26, and the identification signal generation circuit 26 generates a positive identification signal and outputs it to the transmission circuit 7. The first control circuit 14 controls the first switching circuit 13 in response to the output of this identification signal, and outputs the electrocardiographic signal from the amplifier circuit 5 to the transmission circuit 7. As a result, a positive identification signal corresponding to switching from wired transmission to wireless transmission is transmitted, and subsequently an electrocardiographic signal is transmitted. On the other hand, in the main body 3, upon detecting that the cord 11 has been removed, the second control circuit 17 controls the second switching circuit 16 to output the electrocardiographic signal from the receiving circuit 9 to the recording analysis section 10. Receiving circuit 9
Release the cutoff of the power supply to the unit and start operation.

In this way, by connecting the cord 11, the electrocardiographic signal is transmitted by wire, and by removing the cord 11, the electrocardiographic signal is transmitted wirelessly, and when switching between wireless transmission and wired transmission, the corresponding positive or negative Since the identification signal is transmitted before the electrocardiographic signal is transmitted, the recorded electrocardiographic signal becomes as shown in Figure 2, making it easy to determine from which part the electrocardiographic signal was transmitted wirelessly or by wire. Become.

FIG. 3 shows the first control circuit 1 of the detection unit 2 in FIG.
4 and an identification signal generating circuit 26; FIG.

The first control circuit 14 has a code 11 as described below.
is connected between the detection part 2 and the main body 3,
That is, the code detection circuit 27 provides a high level output during wired transmission, and the code detection circuit 27 provides a low level output when the cord 11 is removed, that is, during wireless transmission. 1 switching circuit 13 and an output circuit 28 that outputs a detection signal corresponding to switching of transmission. Further, the output of the code detection circuit 27 is given to the transmitting circuit 7, so that during wired transmission, the power supply to the transmitting circuit 7 is cut off and the operation is stopped.

The output circuit 28 includes an exclusive OR circuit 29 to which the output of the code detection circuit 27 is applied to one input, a one shot circuit 30 to which the output of the exclusive OR circuit 29 is applied, and a D input to which the output of the code detection circuit 27 is applied. and a D flip-flop 32 to which the output of the one-shot circuit 30 is applied to the clock input via an inverter 31, a first AND circuit 33 to which the output of the code detection circuit 27 and the output of the one-shot circuit 30 are applied, and the code detection circuit 27. The output of is given via the inverter 34, and
A second AND circuit 35 is provided to which the output of the one-shot circuit 30 is applied. Each AND circuit 3
The outputs of D flip-flops 3 and 35 are given to the identification signal generation circuit 26 as detection signals.
The output of No. 2 is given to the first switching circuit 13 as a signal for switching control.

The identification signal generation circuit 26 includes first and second analog switches 36 and 37 that are turned on when a high-level detection signal is applied from the output circuit 28;
The first operational amplifier 4 provides a positive identification signal divided by the resistors 38 and 39 to the second analog switch 37.
0 and the output of this first operational amplifier 40 with a gain of 1
and a second operational amplifier 41 that inverts and amplifies the signal and provides a negative identification signal to the first analog switch 36.

The operations of the first control circuit 14 and the identification signal generation circuit 26 having such configurations will be described next.

First, in a wireless transmission state where the cord 11 is not connected, the output of the cord detection circuit 27 is:
Therefore, the transmitting circuit 7 is supplied with power and is operating, and the outputs of the one-shot circuit 30 and the D flip-flop 32 of the output circuit 28 are also low level, and the first switching circuit 7 is at a low level. The electrocardiographic signal from the amplification circuit 5 is given to the transmission circuit 7 by the circuit 13 and wirelessly transmitted to the main body 3.

Next, when the cord 11 is connected, the output of the cord detection circuit 27 becomes high level, the power supply to the transmitting circuit 7 is cut off, and the operation of the transmitting circuit 7 is stopped. In addition, exclusive OR circuit 2
9 becomes high level and triggers the one-shot circuit 30, which outputs a pulse of a predetermined width. Therefore, the output pulse of the one-shot circuit 30 is output as a detection signal from the first AND circuit 33 to which the outputs of the one-shot circuit 30 and the code detection circuit 27 are supplied, and thereby the first analog switch 36 A negative identification signal is output to the first connector 12 via.

The falling edge of the output pulse of the one-shot circuit 30 is inverted by the inverter 31 and serves as a trigger for the D flip-flop 32, whereby the output of the D flip-flop 32 becomes high level and the first switching circuit 13 is switched from the amplifier circuit 5 to An electrocardiographic signal is applied to the first connector 12. Therefore, when switching from wireless transmission to wired transmission, the electrocardiogram signal is transmitted by wire following the negative identification signal.

Next, when the cord 11 is removed and wired transmission is switched to wireless transmission, the output of the code detection circuit 27 becomes low level, power is supplied to the transmitting circuit 7, and the operation starts. Immediately after this switching, D
The output of the flip-flop 32 is at a high level, so the exclusive OR circuit 29
When the output becomes high level, one-shot circuit 3
0 trigger, and the one shot circuit 30 outputs a pulse of a predetermined width. Therefore, the output of the one-shot circuit 30 and the code detection circuit 2
The second AND circuit 3 is provided with an inverted output of 7.
5 outputs the output pulse of the one-shot circuit 30 as a detection signal, whereby a positive identification signal is outputted to the transmitting circuit 7 via the second analog switch 37.

The falling edge of the output pulse of the one-shot circuit 30 is inverted by the inverter 31 and triggers the D flip-flop 32, so that the output of the D flip-flop 32 becomes low level, and the first switching circuit 13 is inverted from the amplifier circuit 5. The electrocardiographic signal is given to the transmitting circuit 7. Therefore, when switching from wired transmission to wireless transmission, the electrocardiographic signal is transmitted wirelessly following the positive identification signal.

FIG. 4 is a circuit diagram showing the detailed configuration of the code detection circuit 27 and the second control circuit 17 of the main body 3 described above.

The second control circuit 17 on the side of the main body 3 includes an oscillation circuit 18 that oscillates at a constant frequency, and this oscillation circuit 18.
an inverter 19 that inverts the output of the inverter 19; a transistor 21 to which the output of the inverter 19 is applied to the base via a resistor 20; a second retriggerable one-shot circuit 22 to which the collector output of the transistor 21 is applied; A common connection between the collector of the transistor 21, the second retriggerable one-shot circuit 22, and the resistor 23 is connected to the third terminal 15c of the second connector 15. It is connected to the.

The output of the second retriggerable one-shot circuit 22 is given to the second switching circuit 16 as a signal for switching control, and is also given to the receiving circuit 9 as a signal for controlling the cutoff of the power supply to the receiving circuit 9. .

On the other hand, the code detection circuit 27 on the detection unit 2 side includes an inverter 24 connected to the third terminal 12c of the first connector 12, and a first retriggerable one-shot circuit 25 to which the output of the inverter 24 is applied.
and a pull-up resistor 26 connected between the first connector 12 and the inverter 24. The resistor 23 has a much larger value than the resistor 26, and when the transistor 21 is turned off, the collector becomes high level.

This code detection circuit 27 and the second control circuit 1
7, the cord 11 is connected to the first and second
When the third terminals 12c and 15c of the collectors 12 and 15 are conductive, the transistor 21 of the second control circuit 17 is connected to the resistor 26 of the code detection circuit 27.
is pulled up, and an oscillation pulse of the frequency appears at the collector of the transistor 21. Therefore,
The second retriggerable one-shot circuit 22 of the second control circuit 17 is given an oscillation pulse of the same frequency, and the first retriggerable one-shot circuit 25 of the first control circuit 14 is also given an oscillation pulse of the same frequency. is applied via the inverter 24.

Both retriggerable one shot circuits 22, 25
have their output pulse widths larger than 1/f, so their outputs both go to high level upon input of the oscillation pulse, and remain at high level until code 11 is removed.

Therefore, when the cord 11 is connected to the first and second connectors 12 and 15, the cord detection circuit 27
The output of the second control circuit 17 becomes high level, and when the cord 11 is disconnected, there is no conduction between the third terminals 12c and 15c of the first and second connectors 12 and 15, and the first and second connectors The inputs of the triggerable one shot circuits 25 and 22 both become low level, and the code detection circuit 27 and the second control circuit 17
Both outputs become low level.

With the above configuration, when the cord 11 is connected between the detection unit 2 and the main body 3, the electrocardiogram signal is transmitted by wire via the cord 11, and the cord 11
By removing the ECG signal, the electrocardiogram signal is transmitted wirelessly.
Moreover, when switching between wireless transmission and wired transmission, the corresponding positive or negative identification signal is transmitted before the electrocardiographic signal is transmitted, so that the recorded electrocardiographic signal can be transferred wirelessly or wired. This makes it easy to determine whether the signal is the actual electrocardiogram signal, and it is no longer possible to mistakenly recognize noise peculiar to wireless transmission as the original electrocardiogram signal, as in the conventional example, making it possible to perform a highly accurate diagnosis.

Furthermore, in this embodiment, the operation of the transmitting/receiving circuits 7 and 9 is stopped during wired transmission, so power consumption is reduced compared to the conventional example.

<Effects of the invention> As described above, according to the invention, electrocardiographic signals can be transmitted wirelessly or wired by attaching and detaching the cord, and when switching between wired and wireless transmission,
Since identification signals corresponding to wired and wireless transmission are recorded, it is easy to determine which part of the recorded signal was transmitted by wire or wirelessly. This means that diagnosis can be performed more efficiently than in the past.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a waveform diagram of a recording signal, FIG. 3 is a circuit diagram showing details of the first control circuit and identification signal generation circuit, and FIG. FIG. 2 is a circuit diagram showing details of the code detection circuit and second control circuit shown in the figure. 1... Electrocardiograph, 2... Detection unit, 3... Main body, 1
1... Cord, 12, 15... First and second connectors, 13, 16... First and second switching circuits, 14,
17...First and second control circuits, 26...Identification signal generation circuit.

Claims (1)

[Claims for Utility Model Registration] Consisting of a detection unit that detects and transmits electrocardiographic signals from a living body, and a main body that records the transmitted electrocardiographic signals, the detection unit includes electrodes for detecting electrocardiographic signals. , an amplifier circuit that amplifies the electrocardiographic signal from the electrode, and a transmitter circuit that modulates a carrier wave with the electrocardiogram signal from the amplifier circuit and transmits the modulated carrier wave, and the main body receives and demodulates the radio wave from the transmitter circuit. In an electrocardiograph including a receiving circuit that takes out an electrocardiographic signal and a recording section that records the electrocardiographic signal from the receiving circuit, the detecting section includes a first connection to which one end of a cord for transmitting the electrocardiographic signal is connected. a first switching circuit that switches and outputs the electrocardiographic signal from the amplifying circuit to the transmitting circuit or the first connection terminal; detects whether or not the cord is connected; The switching circuit is controlled to transmit the electrocardiographic signal from the amplifier circuit to the main body via the first connection terminal, and when the cord is not connected, the first switching circuit is controlled to transmit the electrocardiographic signal from the amplifier circuit to the main body via the first connection terminal. a first control circuit that wirelessly transmits the information to the main body via a transmission circuit; and an identification signal corresponding to wireless transmission or wired transmission in response to an output of the first control circuit when switching between wired transmission and wireless transmission; an identification signal generation circuit that generates an identification signal and transmits it to the main body via the transmission circuit or the first connection terminal, and the other end of the cord for transmitting the electrocardiographic signal is connected to the main body. a second connection terminal; and a second connection terminal that switches and outputs an electrocardiographic signal from either the receiving circuit or the second connection terminal to the recording section.
detecting whether or not the cord is connected to a switching circuit, and when the cord is connected, controlling a second switching circuit to output an electrocardiogram signal transmitted by wire through a second connection terminal to a recording unit; An electrocardiograph comprising: a second control circuit that controls a second switching circuit to output electrocardiographic signals wirelessly transmitted via a receiving circuit to a recording section when a cord is disconnected.