JPH10234689A - Biological information recorder and medium recording computer program of biological information recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological information recorder provided with a function for automatically judging the contact state of a living body contact electrode capable of performing the highly reliable measurement of excellent quality at all times and a medium recording the computer program of the biological information recorder. SOLUTION: At the time of measuring an electrocardiographic waveform, a living body contact resistance detection part 21 inputs detection signals for indicating a living body contact resistance value changed by the attached state of electrodes 1A and 1B to a CPU 10. When the detected resistance value is sufficiently small (less than a set threshold value) and the electrodes 1A and 1B are in a normal contact state, the CPU 10 starts the sampling and recording operation of electrocardiogram data (electrocardiographic waveform data). Also, when the detected resistance value is larger than the threshold value and the electrodes 1A and 1B are not in the normal contact state, a message for reporting the electrode contact state to a measuring person is displayed and outputted to a display device 19 so as to take the measures of re-abutting the electrodes and attaching water, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to biological information such as a portable electrocardiogram recording device (electrocardiographic waveform recording device) for collecting and recording biological information by contacting a plurality of living body contact electrodes with a predetermined portion of a human body. It relates to a recording device.

[0002]

2. Description of the Related Art In a portable electrocardiogram recording apparatus, a non-wet electrode, for example, a living body contact electrode using a material such as metal or conductive resin is applied to the skin of a predetermined part of a human body (measurer). An electrocardiogram (electrocardiographic waveform) is recorded. In this type of portable electrocardiogram recording apparatus, a potential difference between the right hand and the chest is measured, amplified, quantized, and the like, and recorded in an IC memory or the like.

[0003] In the portable electrocardiographic recording apparatus as described above, when a non-wet electrode is applied to the skin of a predetermined part of the subject to be measured, if the electrode is improperly applied or the skin is dry, However, the contact resistance between the skin and the electrode is not sufficiently reduced, and a correct electrocardiogram cannot be measured.

However, in the above-mentioned portable electrocardiogram recording apparatus, the measurer cannot see the electrocardiogram being measured and cannot judge whether or not the contact resistance of the electrodes is sufficient. However, there is a problem that an electrocardiogram which is poorly recorded may be recorded.

[0005]

As described above, in the conventional portable electrocardiogram recording apparatus, the measurer cannot see the electrocardiogram during the measurement, and therefore whether the contact resistance of the electrodes is sufficient. Since the heel cannot be determined, there is a problem that a poor quality electrocardiogram may be recorded.

The present invention has been made in view of the above circumstances,
With a function to automatically determine the contact state of the biological contact electrode,
It is an object of the present invention to provide a biological information recording device capable of always performing high quality measurement with high reliability, and a medium recording a computer program of the biological information recording device.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a biological information recording apparatus such as a portable electrocardiogram recording apparatus for measuring a skin by applying a non-wet electrode to the skin. If it is dry or the contact resistance between the skin and the electrode is not sufficiently low (the electrode is in a contact state where normal measurement is not possible), you can take measures such as reapplying the electrode or adding water. As described above, it is possible to provide a function of notifying a measurer of the electrode contact state or suspending the measurement until a normal electrode contact state is obtained.

That is, the present invention relates to a biological information recording apparatus for measuring and recording biological information by bringing a plurality of biological contact electrodes into contact with a predetermined portion of a human body, and a circuit connected to the plurality of biological contact electrodes. Detection signal output means for outputting a detection signal according to the contact resistance of each biocatalyst electrode to the human body, and determination means for determining the contact state of the electrodes based on the detection signal output from the detection signal output means It is characterized by comprising.

Further, the biological information recording apparatus is characterized in that it comprises a notifying means for notifying a user of a result of the judgment by the judging means. Further, the biological information recording apparatus further comprises a measurement start switch, and when the switch is operated, the detection signal output means and the judgment means are operated prior to the recording operation.

In the biological information recording apparatus, the detection signal output means converts an output signal of the amplifier circuit connected to the plurality of biological contact electrodes into a logic level signal. And a conversion circuit.

In the biological information recording apparatus, the plurality of biological contact electrodes include three biological contact electrodes including a common electrode, and the detection signal output means includes two biological contact electrodes excluding the common electrode. 2 is provided independently for each contact electrode and is connected to the corresponding electrode signal line by a circuit.
And a conversion circuit for synthesizing output signals of the amplifier circuits and converting the output signal into a logic level signal.

Further, the present invention is a recording medium recording a computer program for controlling a computer which is connected to a living body contact electrode circuit and measures and records biological information for a predetermined time. A first function of outputting a detection signal according to the biological contact resistance when a start instruction is received, and whether the contact state of the electrodes is normal based on the detection signal output by the first function A second function of determining whether or not the contact state of the electrodes is normal, and a third function of measuring and recording the biological information when determining that the contact state of the electrodes is normal. A computer program for realizing the program.

Further, the present invention is a recording medium recording a computer program for controlling a computer which is connected to a living body contact electrode in a circuit and measures and records biological information for a predetermined time. A first function of outputting a detection signal according to the biological contact resistance when receiving a measurement start instruction, and a normal contact state of the electrode based on the detection signal output by the first function. A second function for determining whether or not the contact state of the electrode is abnormal in the second function, a third function for notifying the state to the outside, and a second function. A computer program for realizing a fourth function of executing a process of measuring and recording the biological information when it is determined that the contact state of the electrode is normal.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described using a portable electrocardiogram recording device as an example. FIG. 1 is a block diagram showing a configuration of an apparatus according to a first embodiment of the present invention, FIG. 2 is a flowchart showing an operation processing procedure of the apparatus in the above embodiment,
FIG. 3 is a diagram showing an external configuration of the device according to the above embodiment, FIG. 4 is a diagram for explaining an electrocardiographic waveform measuring method in the device of the above embodiment, and FIG. 5 is a biological contact resistance detection shown in FIG. FIG. 3 is a diagram illustrating a circuit configuration of a unit.

In FIG. 1, reference numerals 1A and 1B denote a pair of living body contact electrodes, which are used by directly contacting the skin of a predetermined part of a human body (measurer) when measuring an electrocardiographic waveform. Here, as shown in FIG. 4, it is used in direct contact with the skin of the right hand and chest.

Reference numeral 10 denotes a CPU constituting a computer that controls the entire apparatus. Here, according to a control program stored in the ROM 15, an electrocardiogram waveform collection and recording process as shown in FIG. An output process by an electrocardiogram or communication (wired or wireless) is executed.

Reference numerals 11 to 13 denote components of a signal processing unit for obtaining an electrocardiographic waveform measurement signal, and 11 denotes electrodes 1A and 1A.
An amplifier circuit (AMP) for amplifying the electrocardiographic waveform signal picked up by B, and a filter circuit (F) for removing a noise component from the signal amplified by the amplifier circuit (AMP) 11
L) and 13 are A / Ds which convert an analog electrocardiographic waveform signal through the filter circuit (FL) 12 into a logical level signal and supply a quantized signal (measurement data) to the CPU 10.
It is a converter (A / D-CONV). Since the circuit configuration of this signal processing unit is the same as the conventional one, a specific circuit configuration is omitted here.

Reference numeral 14 denotes a RAM used as a work area of the CPU 10, a storage area for collected measurement data, and the like, and reference numeral 15 denotes a computer program for executing a process of collecting and recording an electrocardiographic waveform as shown in FIG. A ROM 16 storing a program is an EEP-ROM storing unique device information (ID code) and the like of each device.

Reference numeral 17 denotes a switch signal input interface (SW-I / SW) for inputting operation signals such as a measurement start switch (S) and a mode setting switch (M) to the CPU 10.
F).

Reference numeral 18 denotes an electrocardiogram data output unit 18 which outputs measurement data stored in the measurement data storage area of the RAM 14 as an electrocardiogram or transmits and outputs the electrocardiogram to the outside. Reference numeral 19 denotes a display device for displaying and outputting status information, measurement result information, and the like of the device. Here, the contact resistance between the skin and the electrode is poor due to poor electrode application or dry skin. When is not sufficiently small (the electrode is in a contact state where normal measurement is not possible), a message is displayed to inform the measurer of the electrode contact state so that countermeasures such as reapplying the electrode or applying water can be taken. .

Reference numeral 20 denotes a sound notification device for notifying the state of the device and the like. In this case, when there is an electrode contact state where normal measurement cannot be performed as described above, a notification for notifying a measurer of the electrode contact state. Output sound.

Reference numeral 21 denotes a circuit connected to the electrodes 1A and 1B,
FIG. 5 shows a high-impedance biological contact resistance detecting unit for detecting the biological contact resistance of the electrodes 1A and 1B.
Is shown in

That is, the living body contact resistance detecting section 21 is a functional circuit for inputting a signal indicating a living body contact resistance value that changes according to the adhered state of the electrodes 1A and 1B to the CPU 10 when measuring an electrocardiographic waveform. As shown in FIG. 5, it is configured by an amplifier circuit 22 having a high input impedance provided at a preceding stage and a signal conversion circuit 23 for converting to a logic level provided at a subsequent stage. In the figure, Q1 and Q2 are switching transistors, and R1 to R4 are resistors.

FIG. 3 is a diagram showing an external configuration of the apparatus according to the above embodiment. In the figure, reference numeral 30 denotes a main body of a portable biological information recording apparatus, and 31 denotes a sound wave transmission unit included in the electrocardiogram data output unit 18. Reference numeral 32 denotes a photocoupler for transmitting an optical signal, reference numeral 33 denotes a hinge, and reference numeral 34 denotes a switch for setting an ID code or the like.

The operation of the embodiment of the present invention will now be described with reference to the above drawings. When collecting and storing the electrocardiographic waveform, the electrodes 1A and 1B of the portable electrocardiogram recording apparatus having the configuration shown in FIGS. 1 and 3 are brought into direct contact with the skin of the right hand and chest as shown in FIG. The measurement operation is started by operating the measurement start switch (S) of the apparatus main body.

The operation at this time will be described with reference to FIG.
When the measurement start switch (S) is operated (step A1 in FIG. 2), the CPU 10 follows the control program in the ROM 15 before recording measurement data (electrocardiogram data), that is, before collecting and recording electrocardiogram waveform data. The living body contact resistance detecting section 21 detects a detection signal indicating a living body contact resistance value that changes depending on the attached state of the electrodes 1A and 1B (Step A2 in FIG. 2), and determines the electrode 1A from the detected living body contact resistance value. , 1B are normal (step A3 in FIG. 2).

Here, when the detection resistance value is sufficiently small (below a preset threshold value) and the electrodes 1A and 1B are in a normal contact state, the electrocardiogram data (electrocardiogram waveform data) The collecting and recording operation is started (steps A4 and A5 in FIG. 2).

The electrocardiogram data (electrocardiographic waveform data) at this time
The sampling and recording operations are performed by an amplifier circuit (AMP) 11, a filter circuit (FL) 12, an A / D converter (A / D-C
A signal (electrocardiographic waveform data) processed by a signal processing unit such as the ONV 13 is input to the CPU 10 and written into the RAM 14 under the control of the CPU 10, but this processing operation is the same as that of the related art. Therefore, detailed description of the operation is omitted here.

When the detected resistance value is larger than the set threshold value and the electrodes 1A and 1B are not in a normal contact state, a display is provided so that countermeasures such as reapplying the electrodes and adding water can be taken. A message for notifying the measurer of the electrode contact state is output to the device 19. Furthermore,
A notification sound for notifying the measurer of the electrode contact state is output from the sound notification device 20 (step A6 in FIG. 2).

The operation of the living body contact resistance detector 21 will now be described with reference to FIG. The high-input impedance amplifier circuit 22 provided at the preceding stage has +5 as Vcc.
A voltage of about -5 V is applied as V and Vss,
The resistance R2 is determined by the resistance between the set electrodes and the current amplification factor of the switching transistor Q1, but is generally 10
Use a high resistance of MΩ or more.

When the resistance between the electrodes 1A and 1B is low to some extent, the switching transistor Q1 is turned on by the current flowing through the resistor R1, and the output terminal of the amplifier circuit 22 (the emitter of the switching transistor Q1) is accordingly turned on. The value is close to Vss.

Accordingly, in the signal conversion circuit 23 to a logic level provided at the subsequent stage, the switching transistor Q2 is turned off (OFF), and the detection output becomes a value close to Vdd.

When the resistance between the electrodes 1A and 1B is high, the switching transistor Q1 is turned off (OFF) and the switching transistor Q2 is turned on (ON), and the detection output is 0 (ground). Potential) and this signal indicates that the contact resistance is high.
Can be notified.

In FIG. 5, 53 is equivalent to the signal processing units (11 to 13) shown in FIG. FIG. 6 shows another first embodiment of the present invention, in which the configuration of the living body contact resistance detecting section is a configuration having higher reliability. That is, the living body contact resistance detecting section 21A in this embodiment
Is used when the resistance between the set electrodes is set higher than in the first embodiment described above. In the first embodiment, when the setting of the resistance at which the electrocardiographic waveform can be recorded becomes higher, Accordingly, the value of the resistor R2 must be increased, but if it is difficult to obtain a resistor having such a high resistance value,
By providing a high input impedance amplifier circuit 22A having a Darlington-connected amplifier circuit as shown in the preceding figure, the switching transistor Q2a can be set to a high resistance value that is twice the current amplification factor.

Next, another embodiment of the present invention will be described with reference to FIGS. This embodiment is a method in which three living body contact electrodes A, B, and C are applied to the skin of a predetermined part of a human body (measurement person) for measurement, and the stability is high because the electrode C is a neutral point.

The potentials of the electrodes A and B are input to the signal processing section 63, where they are differentially amplified, quantized, and recorded.
The operation of the signal processing unit 63 is almost the same as that of the embodiment shown in FIGS. 1 to 5, and a description thereof will be omitted.

The connection terminal 61A of the electrode A is connected to a first amplifier circuit 22B having a high input impedance provided at a stage preceding the biological contact resistance detecting section 21B. High-impedance second amplifier circuit 23 provided at the previous stage of resistance detector 21B
B is connected to the circuit.

The output terminal of the first amplifier circuit 22B and the second
The output terminal of the amplifying circuit 23B is input to an OR circuit 24B, connected to a logical OR by diodes D1 and D2, and then input to a signal conversion circuit 25B to a logic level provided at a subsequent stage.

The living body contact resistance detecting section 21B having the above circuit configuration
In this case, a voltage of about +5 V is applied to Vcc and a voltage of about -5 V is applied to Vss, and a high resistance of several MΩ or more is generally used as the resistor R2.

When the resistance between the electrode A and the electrode C is somewhat low, the switching transistors Q1 and Q2 are turned on by the current flowing through the resistor R1, and the first transistor is turned on.
The output terminal of the amplifier circuit 22B has a value close to Vss.
When the resistance between the electrodes A and C is high, the output terminal of the first amplifier circuit 22B has a value close to Vcc.

When the resistance between the electrodes B and C is low to some extent, the current flowing through the resistor R3 turns on the switching transistors Q3 and Q4.
The output terminal of the second amplifier circuit 23B has a value close to Vss. When the resistance between the electrodes B and C is high, the output terminal of the second amplifier circuit 23B has a value close to Vcc.

The OR circuit 24B has at least the first
When the output terminal of the amplifier circuit 22B or the second amplifier circuit 23B has a value close to Vcc, the output terminal voltage is changed from Vcc to
A voltage value obtained by subtracting the forward voltages of the diodes D1 and D2 is set to 0 potential.

When the output terminal voltage becomes a voltage value obtained by subtracting the forward voltage of the diodes D1 and D2 from Vcc,
Signal conversion circuit 25 for logic level provided at subsequent stage
The switching transistor Q5 of B is turned on (ON), and the detection output becomes 0 potential. Also, when the output terminal voltage is 0
When the potential becomes the potential, contrary to the above state, the switching transistor Q5 is turned off (OFF), and the detection output becomes V
It becomes a value close to dd.

That is, when the resistance value between any one of the electrodes A and B and the electrode C becomes high, the detection output becomes 0 potential.
From this signal, it can be notified that the contact resistance is high. As described above, according to the embodiment of the present invention, in a portable electrocardiogram recording apparatus that measures by applying a non-wet electrode to the skin, the method of applying the electrode is bad, or the skin is dry. When the contact resistance between the skin and the electrode is not small enough (when the electrode is in a contact state where normal measurement is not possible), the condition can be notified to the measurer. After taking such measures, a normal electrocardiogram (electrocardiographic waveform) can be recorded.

In a portable electrocardiogram recording apparatus in which non-wet type three electrodes of +,-, and neutral points are applied to the skin for measurement, the application of the electrodes is poor or the skin is dry. If the contact resistance between any of the + and-skins and the electrode is not sufficiently small, the condition can be notified to the measurer.Take measures such as reapplying the electrode and adding water. After that, a correct electrocardiogram (electrocardiographic waveform) can be recorded under a normal electrode contact state.

In the above-described embodiment, a portable electrocardiogram recording apparatus for measuring a potential difference between the right hand and the chest is taken as an example. However, the present invention is not limited to this. It can be applied to a biological information recording device.

[0047]

As described in detail above, according to the present invention, a biological information recording apparatus capable of always performing reliable and high quality measurement by providing a function of automatically determining the contact state of the biological contact electrode, In addition, a medium in which a computer program of the biological information recording device is recorded can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation processing procedure of the apparatus in the embodiment.

FIG. 3 is a diagram showing an external configuration of the apparatus according to the embodiment.

FIG. 4 is a view for explaining an electrocardiographic waveform measuring method in the device of the embodiment.

FIG. 5 is a diagram showing a circuit configuration of the living body contact resistance detection unit shown in FIG. 1;

FIG. 6 is a diagram showing a circuit configuration of a biological contact resistance detection unit according to another first embodiment of the present invention.

FIG. 7 is a diagram showing a circuit configuration of a biological contact resistance detection unit according to another second embodiment of the present invention.

FIG. 8 is a diagram for explaining an electrocardiographic waveform measurement method according to another second embodiment of the present invention.

[Explanation of symbols]

1A, 1B: Biological contact electrode, 10: CPU, 14: RAM, 15: ROM, 18: Electrocardiogram data output unit, 19: Display device, 20: Sound emitting device, 21: Biological contact resistance detecting unit, 22, 22A, 22B, 23B: Two high input impedance amplifier circuits provided at the front stage; 23, 25B: Signal conversion circuit to logic level provided at the rear stage; 24B: OR circuit; 30: Portable biological information recording device main body; 53, 63: signal processing unit, S: measurement start switch, M: mode setting switch.

Claims (7)

[Claims] 1. A biological information recording device that performs a recording operation by measuring biological information by bringing a plurality of living body contact electrodes into contact with a predetermined part of a human body, wherein the circuit is connected to the plurality of living body contact electrodes, and A detection signal output unit that outputs a detection signal corresponding to a contact resistance of each biocatalyst electrode; and a determination unit that determines a contact state of the electrode based on the detection signal output from the detection signal output unit. A biological information recording device, comprising: 2. The biometric information recording device according to claim 1, further comprising: a notifying unit that notifies a user of a result of the determination by the determining unit. 3. The apparatus according to claim 1, further comprising a measurement start switch, wherein when the switch is operated, the detection signal output means and the judgment means are operated prior to the recording operation.
The biological information recording device according to the above. 4. The detection signal output means includes an amplifier circuit connected to the plurality of living body contact electrodes, and a conversion circuit for converting an output signal of the amplifier circuit into a logic level signal. Or the biological information recording device according to 2 or 3. 5. The plurality of living body contact electrodes include three living body contact electrodes including a common electrode, and the detection signal output unit is provided independently for each of the two living body contact electrodes excluding the common electrode. 4. The amplifier according to claim 1, further comprising: two amplifier circuits connected to the corresponding electrode signal lines; and a conversion circuit for combining output signals of the respective amplifier circuits and converting the output signals into logic level signals. Biological information recording device. 6. A recording medium which records a computer program for controlling a computer which is connected to a living body contact electrode and measures and records living body information for a predetermined period of time, and wherein said computer is instructed to start measurement. A first function of outputting a detection signal according to the biological contact resistance when received, and determining whether or not the contact state of the electrode is normal based on the detection signal output by the first function And a third function of executing a process of measuring and recording the biological information when it is determined by the second function that the contact state of the electrodes is normal. A machine-readable recording medium on which a computer program is recorded. 7. A recording medium which records a computer program for controlling a computer which is connected to a living body contact electrode in a circuit and measures and records biological information for a predetermined time, wherein the computer is instructed to start measurement. A first function of outputting a detection signal according to the biological contact resistance when receiving the signal, and determining whether the contact state of the electrode is normal based on the detection signal output by the first function. A second function of determining, a third function of notifying the state of contact of the electrode to the outside when the second function determines that the contact state of the electrode is not normal, A machine-readable recording medium storing a computer program for realizing a fourth function of executing a process of measuring and recording the biological information when it is determined that the contact state is normal.