JPH07275217A - Electrocardiograph - Google Patents

Abstract

PURPOSE:To provide accurate measurement while eliminating the influence of internal noise on the detection part of an electrocardiographic wave. CONSTITUTION:An analog signal of an electrocardographic wave from a second electrode 7 is inputted into a first detection part 20, and a second detection part 30 carries out the A/D conversion of this signal for measuring the electrocardiographic wave. The signal transmission between detection parts 20 and 30 is carried out by the optical communication between a LED 11 and a phototransistor 12, and the first detection part 20 is electrically separated from the second detection part 30. Coils 41, 43 induce a secondary current from the current of a constant-voltage circuit 42, and supply power to the first detection part 20, thereby the first detection part 20 is electrically separated from the constant-voltage circuit 42. By the electrical separation, the influence of noise on the first detection part 20 can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrocardiograph for measuring electrocardiographic waves, and more particularly to a portable electrocardiograph.

[0002]

2. Description of the Related Art A portable electrocardiograph is convenient in use because it can measure an electrocardiographic wave at any time or in an emergency. This portable electrocardiograph has two electrodes on the outer surface of a small case body, and an electrocardiographic measurement circuit is incorporated inside. Cardiac radio waves are measured by grasping one electrode with a hand and turning on the switch while the other electrode is in contact with the chest on the heart side.

The cardiac radio wave measuring circuit is composed of an analog circuit portion into which the cardiac radio wave is inputted as an analog signal, and a digital circuit portion which performs A / D conversion of the signal from the analog circuit portion and then measures the cardiac radio wave. . All of these circuits are designed to operate by being supplied with power from the battery built into the case body.The analog circuit section amplifies and shapes the analog signal of the cardiac wave, and the digital circuit section keeps the analog signal constant. A / D conversion is performed by sampling every hour, and A
It stores and / or displays the digital signal of the / D-converted cardiac wave.

[0004]

In the above-mentioned conventional electrocardiograph, since the analog circuit section and the digital circuit section are not electrically separated from each other when the electrocardiographic wave is measured, the digital noise of the digital circuit section causes an analog circuit. There is a problem that waveforms are distorted by affecting the internal parts, which prevents accurate measurement of cardiac radio waves.

The present invention has been made in consideration of the above circumstances, and an object thereof is to provide an electrocardiograph capable of accurately measuring electrocardiographic waves without causing waveform distortion due to digital noise.

[0006]

In the electrocardiograph of the present invention, an electrode provided on the case main body so as to come into contact with the body, and an analog signal of a cardiac wave are input from the electrode. And a second detection unit for converting an analog signal from the first detection unit into a digital signal to measure a cardiac wave, and a signal from the first detection unit for transmitting to the second detection unit. And a signal transmitting unit for transmitting by communication.

In the above structure, the first detecting section for processing the analog signal of the cardiac wave and the second detecting section for digitizing and processing the analog signal are connected via the signal transmitting means, By using a light emitting element and a light receiving element that perform optical communication as the signal transmitting means, these detecting portions can be electrically separated. As a result, the first detector is less likely to be affected by noise, and it is possible to detect an accurate cardiac radio wave without waveform distortion.

Further, the electrocardiograph of the present invention comprises a case body composed of first and second cases which are connected to each other via a hinge member so as to be foldable and expandable, and the first body so as to come into contact with the body. Electrode provided in the case, a first detection unit provided in the first case to which an analog signal of a cardiac wave is input from the electrode, and a first detection unit provided in the second case Detection unit for converting an analog signal from the digital signal into a digital signal and measuring a cardiac radio wave, and the first detection unit arranged at a position facing the first and second cases in a state where the case body is expanded. And a signal transmitting means for transmitting the signal from the second detecting section to the second detecting section by optical communication.

In this structure, since the case body can be folded, it can be made compact and convenient for carrying. Moreover, since the signal transmission means is arranged at the position where the first case and the second case are opposed to each other in the case main body, optical communication is performed only when the case main body is expanded and measured. Therefore, unnecessary optical communication is not performed and unnecessary data input is eliminated.

[0010]

1 and 2 show one embodiment of the present invention,
The case body 1 is configured by connecting the first case 2 and the second case 3 which are both formed in a thin rectangular shape. The connection between the first case 2 and the second case is performed via the hinge member 4. The hinge member includes tubular hinge portions 2a and 3a formed coaxially on opposite ends of the first and second cases 2 and 3, and a hinge pin 5 penetrating the hinge portions 2a and 3a. Consists of. As a result, the first and second cases 2 and 3 are rotatably connected to each other and can be folded and unfolded.

The first case 2 has a first electrode serving as one electrode.
The electrode 6b is disposed on the upper surface thereof, and the second electrode 7 is disposed at the end opposite to the second case 3.
In the second case 3, the first electrode 6a is arranged on the upper surface. Both of the electrodes 6a and 6b are used as the first electrodes because both of the electrodes 6a and 6b are electrically connected through the human body at the time of electrocardiographic measurement. Then, the electrocardiographic wave grips both the first electrodes 6a and 6b with the hand,
It is measured by abutting the electrode 7 of the above to the chest on the heart side. The electrodes 6a, 6b and 7 are made of a conductive material such as conductive rubber.

On the other hand, the display member 8 is arranged on the upper surface of the second case 3. The display member 8 displays the measured electrocardiographic wave or the pulse or the like obtained from the electrocardiographic wave in the form of a waveform or a numerical value. In the present embodiment, the case body 1 is made thin by using a liquid crystal display device as the display member 8.

In FIG. 2, reference numerals 9 and 10 designate a first portion which will be described later.
Is a signal transmitting means for performing optical communication between the detection unit 20 and the second detection unit 30 (see FIG. 3), 9 is a light emitting diode (LED) housing portion, and 10 is a phototransistor housing portion. Both are transparent. The LED housing 9 is arranged at the end of the first case 2, and the phototransistor housing 10 is arranged at the end of the second case 3.
These are arranged so as to face each other in the unfolded state of the case body 1 (state of FIG. 1). That is, when the case body 1 is in the unfolded state, these storage portions 9 and 10 are in close contact with each other, but when the case body 1 is in the folded state (the state of FIG. 2), they are separated from the opposite side of the hinge member 4. Therefore, optical communication is possible in the unfolded state, but optical communication is not possible in the folded state. The housing 11 accommodates the LED 11 as a light emitting element, and the housing 10 accommodates the phototransistor 12 as a light receiving element (see FIG. 3).

FIG. 3 shows a circuit configuration arranged in the case body 1. Reference numeral 20 denotes a first detection unit, which is arranged inside the first case 2. The first detector 20 includes an amplifier circuit 21 connected to the first electrode 6a and the second electrode 7 and a filter circuit 22 connected to the amplifier circuit 21. The amplification circuit 21 receives the cardiac radio wave from the second electrode 7 as an analog signal and amplifies this analog signal.
The filter circuit 22 removes a noise part from the amplified signal. Further, the filter circuit 22 shapes the waveform of the signal from which the noise part has been removed. The LED 11 including an LED driver is connected to the filter circuit 22, and the LED 11 emits light when a signal is input from the filter circuit 22.

In FIG. 3, reference numeral 30 denotes a second detector, which is arranged inside the second case 3. The second detector 30 uses an amplifier circuit 31 for amplifying the signal from the phototransistor 12 and a signal amplified by the amplifier circuit 31 as A
A / D conversion circuit 32 for converting / D into a digital signal
And a CPU 33 that measures a cardiac wave by inputting a digitized signal. CPU3
3 outputs the measured electrocardiographic wave data to the display member 8 to display the data, and outputs the data to the storage circuit 34 for storage. The LED 11 and the phototransistor 12 are provided between the second detection unit 30 and the first detection unit 20 having such a configuration.
The first detection unit 20 is electrically separated from the second detection unit 30 due to the arrangement of the signal transmission means for optical communication.

The second detector 30 includes a power source 40 such as a battery.
Power is supplied from. There is a first on the ground side of this power supply 40.
Electrode 6a is connected. A primary coil 41 is connected to a supply circuit of the power source 40, and a constant voltage circuit 42 that controls a pulse width is connected to the supply circuit. The constant voltage circuit 42 supplies a constant voltage to the second detection unit 30 via the diode 50 and the capacitor 60, which allows the power supply 4 to operate.
A commercial power supply can also be used as 0. 43 is a secondary coil, and the secondary coil 43 and the primary coil 4
1 and 1 form an induction coil. A smoothing circuit 44 is connected to the secondary coil 43, and power is supplied to the first detection unit 20 via the switch 46. That is, when a current flows through the primary coil 41, a secondary current is induced in the secondary coil 43 by electromagnetic induction, and the secondary current is smoothed by the smoothing circuit 44.
After being smoothed by the first detecting unit 20, the primary coil 41, the secondary coil 43, and the smoothing circuit 44 detect the secondary current based on the constant voltage circuit 42 by the first detection. The power transmission means 45 supplied to the unit 20 is configured.

In this embodiment, the primary coil 41 is the first
The diode 5 is housed in the hinge part 2a of the case 2 of
0, the capacitor 60, the constant voltage circuit 42, the power supply 40 is also the first
It is stored in the case 2. The secondary coil 43 is the second
The smoothing circuit 44, which is housed in the hinge portion 3 a of the case 3, is also housed in the second case 3. By arranging in this way, the storage space for the coils 41, 43 is reduced, and there is an advantage that the size can be reduced.

In the above structure, when the case main body 1 shown in FIG. 1 is in the expanded state, the second detection unit 30 is supplied with power from the constant voltage circuit 42, while the first detection unit 20 is supplied with power from the power supply means 45. The power of the secondary current is supplied. As a result, the analog signal of the cardiac radio wave input to the first detection unit 20 is transmitted to the second detection unit 30 by the signal transmission means including the LED 11 and the phototransistor 12,
After the A / D conversion, the cardiac wave is measured. With such a configuration, the first detection unit 20 is electrically separated from the second detection unit 30 by the signal transmission unit that performs optical communication, and the second detection unit 20 is electrically separated by the power transmission unit 45 that performs electromagnetic induction. Thirty
It is electrically separated from the constant voltage circuit 42 on the side. As a result, the first detector 20 is not affected by digital noise,
Since no waveform distortion occurs, the cardiac radio wave can be accurately measured and a commercial power supply can be used.

Further, the LED 11 and the phototransistor 12 as the signal transmitting means are capable of optical communication only when the case body 1 is in an expanded state.
In the folded state, the optical communication is disabled due to the separation. Therefore, when the electrocardiograph is folded, optical communication is not performed when unnecessary, unnecessary data is not input, and unnecessary power consumption can be prevented.

In the above embodiment, the LED 11 and the phototransistor 12 are used only for signal transmission. However, by using the signal for detecting the enabled / disabled state of the optical communication as the measurement start switch signal, the pressing is performed. The switch to operate is unnecessary, the number of parts is reduced, and
There is a merit that erroneous switch operation is eliminated.

[0021]

According to the present invention, the first detecting portion and the second detecting portion are electrically separated by the signal transmitting means for optical communication, and the first detecting portion is separated by the power transmitting means for electromagnetic induction. Since the constant voltage generating means is electrically separated, the influence of noise on the first detection section is eliminated, and the cardiac radio waves can be accurately measured.

Further, according to the present invention, the case body can be miniaturized by adopting the folding structure of the first case and the second case, and the signal transmitting means can be arranged at the opposing position of the first and second cases. This eliminates unnecessary data input.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention in a developed state.

FIG. 2 is a perspective view of a folded state of the embodiment.

FIG. 3 is an internal circuit configuration diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main body 2 1st case 3 2nd case 4 Hinge member 5 1st electrode 7 2nd electrode 20 1st detection part 30 2nd detection part 42 Constant voltage circuit 45 Electric power transmission means

Claims (4)

[Claims] 1. A first detection unit to which an analog signal of a cardiac radio wave is input from an electrode in contact with the body, and a second detection unit for converting the analog signal from the first detection unit into a digital signal. An electrocardiograph, comprising: a signal transmission unit that transmits a signal from the first detection unit to the second detection unit by optical communication. 2. A case main body comprising first and second cases connected to each other via a hinge member so as to be foldable and expandable, and an electrode provided on the first case so as to contact the body. , A first detection unit provided in the first case and to which an analog signal of a cardiac wave is input from the electrode, and an analog signal from the first detection unit provided in the second case are converted into digital signals. A second detection unit that converts and measures an electrocardiographic wave and a second detection unit that is arranged at a position facing the first and second cases in a state where the case main body is expanded is used to detect a signal from the first detection unit. An electrocardiograph, which is provided with a signal transmitting means for transmitting the signal by optical communication. 3. The second detecting section has a display member for displaying the measured cardiac radio waves.
Or the electrocardiograph according to 2. 4. The signal transmitting means comprises a light emitting element arranged in the first case and a light receiving element arranged in a portion of the second case facing the light emitting element. The electrocardiograph according to claim 2.