JPH0533122Y2 - - 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 on this, there is also a Holter electrocardiograph that uses a wireless telemeter system that allows a cordless connection between the detection part such as an electrode and the main body. The circuit modulates the signal and transmits it as a high-frequency signal, while the main body receives this high-frequency signal with a receiving circuit, demodulates the electrocardiographic signal, and records it. This wireless telemeter-type Holter electrocardiograph eliminates the need for a cord between the detection unit and the main body, as described above.
It is very convenient as the main body can be easily stored in a clothes pocket or handbag.

However, when using this wireless telemeter type Holter electrocardiograph especially outdoors,
Depending on the situation, the influence of external noise may be unavoidable, and in such cases it is necessary to use wireless.

Conventionally, when trying to use this wireless telemeter-type Holter electrocardiograph with a wire, the antenna of the transmitter/receiver circuit was removed and the antenna terminals were connected with a cord to transmit high-frequency signals. It takes time and effort, and
Since it is transmitted as a high-frequency signal, it is still susceptible to strong electric field noise, and furthermore, even when used by wire, there are disadvantages such as high power consumption to operate the transmitting and receiving circuit.

<Purpose of the invention> The present invention has been developed in view of the above-mentioned points, and is capable of transmitting detected electrocardiographic signals either by wire or wirelessly, and is capable of transmitting detected electrocardiographic signals without being affected by external noise. The purpose of the present invention is to provide an electrocardiograph that is difficult to use and has low power consumption.

<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 a cord is connected; a first switching circuit which switches and outputs the electrocardiographic signal from the amplifier circuit to the transmission circuit or the first connection terminal; and a cord to the first connection terminal. a first control circuit for controlling switching of the first switching circuit and for controlling supply cutoff of power to the transmitting circuit based on the presence/absence of connection of the main body; a second connection terminal for connecting the cord, a second switching circuit for switching and outputting the electrocardiographic signal from either the receiving circuit or the second connection terminal to the recording section, and a second connection terminal for connecting the cord to the second connection terminal; The second
A second control circuit is provided that controls switching of the switching circuit and controls supply/cutoff of power to the receiver circuit, and the first control circuit controls the first switching circuit when a cord is connected. The electrocardiographic signal from the amplifier circuit is applied to the first connection terminal, the power supply to the transmitting circuit is cut off, and when the cord is disconnected, the first switching circuit is controlled to output the electrocardiographic signal from the amplifier circuit. When the cord is connected, the second control circuit controls the second switching circuit to provide the electrocardiogram signal from the second connection terminal to the recording unit, and also controls the supply of power to the reception circuit. When the cord is disconnected, the second
The switching circuit is controlled to provide the electrocardiographic signal from the receiving circuit to the recording section.

According to the above configuration, in a place with a good radio wave environment,
In addition to being able to wirelessly transmit electrocardiographic signals by removing the cord, in places where the influence of external noise is a concern,
Just by connecting the cord, it is automatically wired, and the operation of the transmitter/receiver circuit is stopped and the electrocardiogram signal is transmitted as the original signal, making it less susceptible to noise and reducing power consumption. will be done.

<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.

The Holter electrocardiograph 1 of this embodiment is not easily affected by external noise, can easily transmit electrocardiographic signals by wire, and is configured as follows in order to suppress power consumption.

That is, the detection unit 2 includes a first connector 12 as a connection terminal to which a cord 11 for transmitting electrocardiographic signals is connected, and a transmitting circuit for transmitting electrocardiographic signals from the amplifier circuit 5 based on the first switching control signal S1. 7 or 1st
A first switching circuit 13 that switches output to the connector 12
and detects whether or not the cord 11 is connected to the first connector 12, and outputs the first switching control signal S1 to the first switching circuit 13 based on this,
A first control circuit 14 is provided that outputs a first power control signal S1' to the transmitting circuit 7 to control cutting off of power supply to the transmitting circuit 7.

As will be described later, when the cord 11 is connected, this first control circuit 14 outputs the first switching control signal S1 and the first power supply control signal S1' at the hay level, and when the cord 11 is not connected, the first control circuit 14 outputs the first switching control signal S1 and the first power supply control signal S1'. , outputs a first switching control signal S1 and a first power supply control signal S1' of low level.

When the first switching circuit 13 receives the high-level first switching control signal S1 from the first control circuit 14, the first switching circuit 13 transmits the electrocardiographic signal from the amplifier circuit 5 to the first connector 12, and controls the first switching control signal S1 at the low level. When the signal S1 is applied, each output is switched to the transmitting circuit 7.

Furthermore, when the first power control signal S1' at a high level is applied to the transmitting circuit 7, the power supply is cut off and the operation is stopped.

On the other hand, the main body 3 has a second
The connector 15, a second switching circuit 16 that switches and outputs the electrocardiographic signal from either the receiving circuit 9 or the second connector 15 to the recording analysis section 10 based on the second switching control signal S2, Detects whether or not the code 11 is connected, and based on this, the second
A second control circuit 17 is provided which outputs a switching control signal S2 and also outputs a second power supply control signal S2' to the receiver circuit 9, which controls cutting off of power supply to the receiver circuit 9.

As will be described later, this second control circuit 17 outputs a high-level second switching control signal S2 and a second power supply control signal S2' when the cord 11 is connected, and when the cord 11 is not connected. At times, the second switching control signal S2 and the second power supply control signal S2' of low level are output.

When the second switching circuit 16 receives the second switching control signal S2 at a high level from the second control circuit 17, the second switching circuit 16 switches the electrocardiographic signal from the second connector 15 to the second switching control signal S2 at a low level. When the electrocardiographic signal is received, the electrocardiographic signals from the receiving circuit 9 are switched and outputted to the recording analysis section 10, respectively.

When the second power control signal S2' at a high level is applied to the receiving circuit 9, the power supply is cut off and the operation is stopped.

FIG. 2 shows the above-mentioned first and second control circuits 14, 1.
FIG. 7 is a circuit diagram showing the detailed configuration of FIG.

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 a second switching control signal S2, a second power supply control signal S
2' to the second switching circuit 16 and the receiving circuit 9, respectively.

On the other hand, the first control circuit 14 on the detection unit 2 side
An inverter 24 connected to the third terminal 12c of the 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 output of the first retriggerable one-shot circuit 25 is transmitted to the first switching circuit 13 and the transmitting circuit 7 as the first switching control signal S1 and the first power supply control signal S1'.
are given to each. The resistor 23 has a much larger value than the resistor 26, and the transistor 21
When is off, the collector is at high level.

In the first and second control circuits 14 and 17,
The cord 11 is connected to the first and second connectors 1
When the third terminals 12c and 15c of the transistors 2 and 15 are conductive, the transistor 2 of the second control circuit 17
1 is pulled up by the resistor 26 of the first control circuit 14, 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 same is given to the first retriggerable one-shot circuit 25 of the first control circuit 14. A frequency oscillation pulse is applied via an inverter 24.

Both retriggerable one shot circuits 22, 25
have their output pulse widths larger than 1/1, 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, high level control signals S are output from the first and second control circuits 14 and 17.
1, S1', S2, and S2' are output, and in the detecting section 2, the electrocardiographic signal from the amplifier circuit 5 is output to the first connector 12, and the operation of the transmitting circuit 7 is stopped. In the main body 3, the electrocardiographic signal from the second connector 15 is given to the recording analysis section 10, and the operation of the receiving circuit 9 is stopped. That is, at this time, the electrocardiographic signal from the amplifier circuit 5 is transmitted as an original signal to the main body 3 via the cord 11 and recorded in the recording analysis section 10.

Next, when the cord 11 is removed, the third terminals 12c and 15c of the first and second connectors 12 and 15 are disconnected, and the inputs of the first and second retriggerable one-shot circuits 25 and 22 are disconnected. Both become low level, and their outputs also become low level. Therefore, at this time, the first and second control circuits 14, 1
7, each low level control signal S1, S1',
S2, S2' will be output, and the detection unit 2
In the main body 3, the electrocardiographic signal from the amplifier circuit 5 is output to the transmitting circuit 7, power is supplied to the transmitting circuit 7, and the electrocardiographic signal from the receiving circuit 9 is transmitted to the recording analysis section 10. At the same time, the receiving circuit 9 is supplied with power and starts operating. That is, at this time, the amplifier circuit 5
The electrocardiographic signal from the main body 3 is modulated and transmitted by the transmitting circuit 7, and the signal is received and demodulated in the main body 3 and recorded in the recording analysis section 10.

In this way, in places with a good radio wave environment, by removing the cord 11, electrocardiographic signals can be transmitted as high-frequency signals in the same way as with conventional wireless systems, and in places where there is concern about the influence of external noise, the cord 11 can be connected. By doing so, the operation of the transmitting/receiving circuits 7 and 9 is stopped and the electrocardiographic signal is transmitted and recorded as the original signal. It is more resistant to noise than , and consumes less power.

<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 transmitting by wire, the electrocardiographic signals are transmitted by stopping the operation of the transmitter/receiver circuit. Since it transmits the original signal as it is, it is less susceptible to noise, and
Power consumption will be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram showing details of the first and second control circuits. 1... Electrocardiograph, 2... Detection section, 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.

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 for extracting an electrocardiographic signal and a recording section for recording the electrocardiographic signal from the receiving circuit, the detecting section has a first connection terminal to which a cord for transmitting the electrocardiographic signal is connected; , a first switching circuit that switches and outputs the electrocardiographic signal from the amplifier circuit to the transmitting circuit or the first connection terminal; A first control circuit is provided to control circuit switching and control to cut off power supply to the transmitting circuit, and the main body includes a second connection terminal to which the cord for transmitting electrocardiographic signals is connected. , a second switching circuit that switches and outputs the electrocardiographic signal from either the receiving circuit or the second connection terminal to the recording section; A second control circuit is provided that controls switching of the switching circuit and controls cutting off of power supply to the receiver circuit, and the first control circuit controls the first switching circuit when a cord is connected. The electrocardiographic signal from the amplifier circuit is applied to the first connection terminal, the power supply to the transmitting circuit is cut off, and when the cord is disconnected, the first switching circuit is controlled to output the electrocardiographic signal from the amplifier circuit. When the cord is connected, the second control circuit controls the second switching circuit to provide the electrocardiogram signal from the second connection terminal to the recording unit, and also controls the supply of power to the reception circuit. When the cord is disconnected, the second
An electrocardiograph characterized by controlling a switching circuit to provide an electrocardiographic signal from a receiving circuit to a recording section.