WO2006120754A1

WO2006120754A1 - Biosignal detecting device

Info

Publication number: WO2006120754A1
Application number: PCT/JP2005/008804
Authority: WO
Inventors: Seijirou Tomita
Original assignee: Seijirou Tomita
Priority date: 2005-05-13
Filing date: 2005-05-13
Publication date: 2006-11-16
Also published as: JPWO2006120754A1; JP4423481B2

Abstract

A nonworn, non constraining biosignal detecting device for accurately detecting the heart rate, the respiratory rate, and fluctuation without being affected by the individual difference of the subject, body movement, and the noise from the outside and the environment. The biosignal detecting device is so constituted that sensor pads for detecting a variation of body surface sound/pressure induced by biological activity are so arranged as to traverse the body, sensors for sensing a variation of the air pressure in the sensor pads are connected to the respective sensor pads, the output signals from the sensors are A/D-converted by A/D conversion circuits, the results of the A/D conversion are added in real time by addition means, periods are calculated from the results of the addition by period calculating means, and the calculated period data are outputted outside as it is, and/or converted into a heart rate/respiratory rate/the number of body movements/fluctuation per unit time by converting means.

Description

Specification

Biological signal detection device

Technical field

The present invention relates to a biological signal detection device that detects heartbeat, respiration, body movement, and fluctuations without being attached to the body and unconstrained.

Background art

[0002] Conventional devices for detecting biological signals include an electroencephalograph that detects an electroencephalogram, an electrocardiograph that detects an electrocardiogram waveform, or an electromyograph that detects an electromyogram waveform. However, these methods detect changes in the potential of living organisms by attaching electrodes directly to the skin, and skill and skill are required for electrode mounting and handling. There are also breathing band devices that detect breathing conditions and breathing curves, but if the body moves, the position may shift and measurement may not be possible.

[0003] As described above, since all of the conventional biological signal detection devices are configured to restrain the movement of the living body and attach directly to the skin, they exert a great stress on the living body during the measurement and are suitable for continuous measurement. It was. In particular, it was unsuitable for detecting biological signals during sleep or detecting biological signals in a relaxed state.

[0004] In particular, when a living body moves, a biological signal cannot be detected even in an apparatus with electrodes attached! / There was a fundamental problem.

In order to solve such problems, in recent years, there has been proposed a biological signal detection apparatus that can easily detect a biological signal without wearing it and without restraint.

[0006] However, as such a biological signal detection device in recent years, a device using a flexible piezoelectric element as in Patent Document 1 or a capacitance between electrode portions due to deformation as in Patent Document 2 is used. There has been proposed one that detects a biological signal using a sensor that detects a change in quantity.

[0007] Further, Patent Document 3 is known as an invention for improving the calculation accuracy of the obtained data of the vital signal detection apparatus.

[0008] By the way, the biological signal detection device provided with the above-described piezoelectric element or capacitance element sensor can measure only a body motion or a respiration curve, and the heart rate as when the electrode is directly attached to the living body. It does not reach the range where the number and the respiratory rate can be measured accurately. In particular, the above Sensor force of flexible piezoelectric element as in Patent Document 1 and capacitive element as in Patent Document 2 The detected signal level is very low, so it is immediately affected by fluctuations due to temperature and noise. Detection is difficult unless the location of the sensor is devised for the living body.

[0009] In addition, since the sensor is in the shape of a rod and is long, various false intelligence signals from blood vessels and organs in various parts of the living body are detected at the same time. It is very difficult to detect biological information.

[0010] In the above type of sensor, there is a difference in the signal detected at the position depending on the gender, body type, and age difference. It was necessary to adjust the sensor layout and signal level.

[0011] Furthermore, in order to perform reliable measurement using the above-mentioned type of sensor, it has been bothersome to use as a large-scale device such as zero adjustment and constant environmental temperature each time measurement is started.

[0012] In addition, in the case of a sensor in which a sealed container filled with a substance as described in claim 2 of Patent Document 2 is formed in a rod shape, the response of the sensor is slowed by the filling substance, and in particular, a high frequency component There are many problems, such as dealing with material leaks when the pressure cannot be detected or when large pressure is applied, and dealing with changes in the sealed material over time, and there are many problems in commercialization.

[0013] Further, Patent Document 3 is an invention that improves the calculation accuracy of respiration rate and heart rate by using a sensor of multiple channels. Cycle calculation of heart rate and respiration rate from data for 5 seconds for each channel. This method requires the calculation calculation time of at least 10 seconds or more in the case of heart rate since the average value is calculated after waiting for the data for the newly input channel for 5 seconds. In addition, when calculating the respiration rate, a calculation calculation time of at least 30 seconds or more is required, and there is a problem that the first calculation takes time. Furthermore, once the detection becomes impossible, data loss occurs each time, and there is a big problem in measuring biological information that takes a long time.

[0014] In addition, Patent Document 3 is configured to improve the calculation accuracy of respiration rate and heart rate by adding data for 5 seconds for each channel. If this occurs, the method of detecting it and removing it from the addition channel is used, so the sensor force detection signal disappears for 5 seconds each time the body moves, and the period cannot be calculated. There was a problem with the correlation of the data to be added.

[0015] In addition, since body motion information is vital biological information in measuring the sleep state, the importance of detecting the number of body motions has increased in recent years. However, it was difficult to detect the heartbeat, and if body movements occurred, it was impossible to detect respiration and heartbeat for a long time.

The problem is that when detecting a biological signal during sleep, the body is moved many times in the REM state, and thus cannot be calculated by conventional means and devices, and a lot of information is lost in the measurement information.

[0016] As described above, the conventional biological information detecting device is effective only when the position of the sensor is finely adjusted according to the state of the living body and the living body is fixed in a resting state. It is technically impossible to measure accurately in an environment where the body moves or has external vibration such as in an automobile. Of course, the number of body movements could not be detected. In addition, conventional devices are not easily accessible to anyone because they are easily affected by environmental conditions such as temperature.

[0017] Patent Document 1: Japanese Patent No. 3125293

Patent Document 2: Japanese Patent No. 3131293

Patent Document 3: Japanese Patent No. 2795106

Disclosure of the invention

[0020] The present invention was devised in view of the current situation, and the object of the present invention is to solve the above-mentioned problems of the conventional and recent biological signal detection devices. It is unconstrained and outputs accurate biological information such as heart rate, respiratory rate, body movement, and fluctuations without being affected by individual differences and body movements of the living body and noise from the environment and outside. Another object of the present invention is to provide a biological signal detection device capable of measuring.

[0021] In order to achieve the above object, the biological signal detection device according to claim 1 includes a biological signal detection sensor pad for detecting changes in sound or Z and pressure on a body surface caused by biological activity. A plurality of them are arranged so as to cross, and the air pressure in the sensor pad is changed. Sensors are connected to each sensor pad, the output signals from this sensor are AZD converted by multiple AZD conversion circuits, and the AZD conversion results are added in real time by the adding means, and this addition result is used. The cycle is calculated by the cycle calculation means, and the calculation cycle is output to the outside as it is, or converted to Z and heart rate per unit time, respiratory rate / body motion frequency fluctuation by the conversion means. It is characterized by that.

In this specification, “period” means a period of a biological signal waveform repeated like an RR interval of an electrocardiogram.

[0023] In this specification, "body movement" means a sound or Z generated by moving the body and a pressure change on the body surface.

[0024] Further, in this specification, "fluctuation" means the fluctuation of the period. Rhythm that repeats in a 24-hour cycle is called the savory power dian rhythm. Minute, hour, day, week, month, year, and life cycle fluctuations are also included in the “fluctuation” in the present invention.

[0025] In this specification, "heart sound" is a sound of the heart that can be heard for each cycle of the heartbeat, and the heartbeat and the cycle are the same.

[0026] Further, in this specification, "real-time addition" means that after a certain amount of AZD conversion data is stored in a memory circuit or the like, the data is always added without taking out and using the data. .

[0027] Also, in this specification, “output data as it is to the outside” means that the calculated cycle without converting it to the number of cycles per unit time is not added to FD, CD, etc. It means recording and saving in a known recording medium, or recording and saving in an external storage medium by transmitting by communication means.

[0028] Next, the biological signal detection device according to claim 2 is based on the technical premise of the biological signal detection device according to claim 1, together with the plurality of biological signal detection sensor pads. A sensor pad for detecting external vibration, which is a component, is placed in a place where it is not affected by biological signals, and a sensor that detects changes in internal air pressure is connected to this sensor pad for detecting external vibration. The output signal is AZD converted by the AZD conversion circuit, and the AZD conversion result force of the plurality of biological signal detection sensor pads is subtracted by the subtraction means from the AZD conversion result of the external vibration detection sensor pad. It is characterized by removing motion and noise.

[0029] In the biological signal detection device according to claim 3, a plurality of biological signal detection sensor pads for detecting sound or Z and pressure changes on the body surface caused by biological activity are arranged across the living body. At the same time, a sensor for detecting a change in air pressure in the sensor pad is connected to each sensor pad for detecting a biological signal, and the output signal of each sensor force is sent to the adding means as an analog signal and added in real time. The added analog signal is AZD converted by a single AZD conversion circuit, the period is calculated by the period calculation means using the result of the AZD conversion, and the calculated period is directly output to the outside as data. , Or Z and the heart rate per unit time, respiration rate, body motion rate, fluctuation are converted by the conversion means.

[0030] Further, the biological signal detection device according to claim 4 is based on the technical premise of the biological signal detection device according to claim 3, and has the same configuration force as the biological signal detection sensor pad. An external vibration detection sensor pad is placed in a place that is not affected by biological signals, and a sensor that detects changes in internal sound or Z and air pressure is connected to this external vibration detection sensor pad. The output signal is subtracted by an analog subtraction circuit to eliminate vibrations and noise from external forces.

[0031] In the biological signal detection device according to claim 5, a plurality of biological signal detection sensor pads for detecting changes in sound or Z and pressure on the body surface caused by biological activity are arranged across the living body. At the same time, sensors that detect changes in air pressure within the sensor pad are connected to each sensor pad, and the output signals of these sensor powers are converted to analog signal switching circuit switching timing and a single AZD conversion circuit. By synchronizing the timing of conversion, only the true biological signal with the same time is added out of the multiple biological signal data, and pseudo signals such as reflection and random signals such as noise are added by addition. It is characterized by being configured to attenuate.

[0032] In this case, the sampling frequency of the AZD conversion circuit and the switching of the analog signal switching circuit are subtle by using a frequency equal to or higher than (the highest biological frequency component of the biological signal X twice the frequency X number of channels). An error caused by a time lag can be set to a level that can be ignored compared to a biological signal component. [0033] That is, the biological signal component having the highest frequency component is a heart sound emitted from the heart. For example, if the frequency component contained in the heart sound is 10 Hz and the number of channels is 4, the sampling frequency is

[0034] 10 X 2 X 4 = 80Hz

As described above, assuming that the basic period of a general heartbeat is 1 Hz, the AZD conversion and analog signal switching frequency is more than 80 times the sampling rate, and errors due to subtle time shifts can be ignored. Also, since breathing is a slower signal than heartbeat, the error is even smaller.

Further, the biological signal detection device according to claim 6 is based on the technical premise of the biological signal detection device according to claim 5, and has the same configuration force as the biological signal detection sensor pad. An external vibration detection sensor pad is placed in a place that is not affected by biological signals, and a sensor that detects changes in internal sound or Z and air pressure is connected to this external vibration detection sensor pad. The output signal is subtracted by an analog subtraction circuit to eliminate vibrations and noise from external forces.

[0036] The biological signal detection device according to claim 7 is based on the technical premise of the biological signal detection device according to any one of claims 2, 4 and 6, and the external vibration detection. The sensor pad for medical use is placed on the same surface as the sensor node that detects changes in sound or Z and pressure on the body surface, and is placed in a place that is not affected by biological signals.

[0037] For example, when a target biological signal is measured on a bed, the external vibration detection sensor pad is preferably placed in a place where the living body does not directly hit, for example, near the foot or above the head. In addition, when the measurement location is a chair, the same surface is limited, so external vibrations can be detected by placing it under the backrest or backside where the buttocks do not hit. Of course, if the top and bottom are arranged upside down, the vibration phase will be reversed, so correction is required.

[0038] The biological signal detection device according to claim 8 is based on the technical premise of the biological signal detection device according to claim 7, and a weight is placed on the surface of the external vibration detection sensor pad. It is characterized by that. [0039] The biological signal detection device according to claim 9 is based on the technical premise of the biological signal detection device according to any one of claims 1 to 8, and the period calculation result includes an absolute time And positional information are added.

[0040] The biological signal detection device according to claim 10 is based on the technical premise of the biological signal detection device according to any one of claims 1 to 9, and each of the biological signal detection sensor pads or The sensor pad for detecting external vibration is configured by enclosing a foamed resin and air inside, and changes in sound or Z and air pressure in each sensor pad are detected by a piezoelectric sensor. While maintaining the air pressure on the pad side, the other side is opened to the atmosphere, and the pressure difference between the air enclosure chamber side and the atmosphere open side is detected.

[0041] The biological signal detection device according to claim 11 is based on the technical premise of the biological signal detection device according to claim 10, and the piezoelectric sensor communicates with the air insertion chamber side atmosphere side. It is characterized in that a simple hole is formed so that air on the air insertion chamber side is pulled out with resistance.

[0042] The biological signal detection device according to claim 12 is based on the technical premise of the biological signal detection device according to claim 11, and a plate material is disposed in the sensor pad. And As the plate material, a flat plate or a plate having an inclined surface can be used.

[0043] The biological signal detection device according to claim 13 is based on the technical premise of the biological signal detection device according to any one of claims 1 to 12, and the sensor pad and the bed or chair. A sheet is interposed between the two. A thick sheet can be used, and a thin sheet is suitable.

Brief Description of Drawings

FIG. 1 is an explanatory diagram showing a schematic configuration of a biological signal detection device of the present invention.

FIG. 2 is an explanatory view showing an example of the arrangement of the sensor pad when the apparatus of FIG.

FIG. 3 is an explanatory diagram showing a configuration of a sensor pad used in the biological signal detection device.

FIG. 4 is a sectional view of the sensor pad taken along line 3A-A in FIG.

FIG. 5 is a block diagram showing a schematic configuration of the biological signal detection apparatus according to Embodiment 1 of the present invention. FIG. 6 is a block diagram showing a schematic configuration of a biological signal detection apparatus according to Embodiment 2 of the present invention.

FIG. 7 is a block diagram showing a schematic configuration of a biological signal detection apparatus according to Embodiment 3 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.

[Example 1]

[0047] As shown in Figs. 1 to 5, the biological signal detection apparatus 1 according to the first embodiment includes a foaming oil and air enclosed therein, and is disposed in a bedding, for example, and a biological activity of a sleeping person. A plurality of sensor pads 2A, 2B, 2C, 2D for detecting sound or Z and pressure changes on the body surface caused by the above are arranged independently across the living body 1A, and the sensor pads 2A, 2B, 2C , Sensors that detect changes in air pressure in 2D (eg piezoelectric sensors) 3A, 3B, 3C, 3D are connected to these sensor pads 2A, 2B, 2C, 2D, and from these sensors 3A, 3B, 3C, 3D The output signal is processed by the signal processing circuits 4A, 4B, 4C, and 4D, and the processed signal is AZD converted by the four AZD conversion circuits 5A, 5B, 5C, and 5D, and the result of the AZD conversion is added and subtracted by the circuit 6 And the period calculation circuit 7 calculates the period using the addition result in the addition / subtraction circuit 6, and the period calculation circuit 7 calculates the period. The biological information processing circuit 8 converts the measured period into heart rate, respiration rate, body movement rate, and fluctuation data per unit time, and then adds GPS information such as position and time to these biological information to save data. Configured to save at 12. Of course, periodic data may be used as an output signal without converting to data per unit time.

[0048] Although a piezoelectric sensor is used as the sensor in this embodiment, a sensor that can convert various known changes in air pressure and sound into electricity, such as a pressure sensor, a piezo element, a microphone, and a vibration sensor are used. be able to.

In FIG. 1, reference numerals 4A, 4B, 4C, 4D, and 4E in this example are signal processing circuits including a signal amplification amplifier and a frequency filter. Depending on the type and signal of the force sensor, only signal amplification is performed. Each circuit may not be necessary depending on the signal processing and signal contents. [0050] In addition to the above configuration, the biological signal detection device 1 includes a data display circuit 11 for displaying biological information, a computer interface circuit 10 for interfacing with a computer, and a data line. And a data communication circuit 9 for transmitting through the network.

[0051] The data storage circuit 12 can be taken out by connecting a medium 12A (SD memory card or the like) that can be exchanged to a memory node disk.

[0052] Further, in the first embodiment, together with the four sensor pads 2A, 2B, 2C, and 2D for detecting the sound or Z and pressure changes on the body surface caused by the biological activity, the same component force is provided. Alternatively, a plurality of external vibration noise detection sensor pads 2E are arranged in a place not affected by a biological signal, and the external vibration detection sensor pad 2E is filled with foamed resin and air inside, and the external vibration Connected to the piezoelectric sensor 3E that detects changes in air pressure in the sensor pad 2E for detection, the output signal from this piezoelectric sensor 3E is signal-processed by the signal processing circuit 4E, and then AZD-converted by the AZD conversion circuit 5E. AZD conversion result force of the four sensor pads 2A, 2B, 2C, 2D The AZD conversion result detected by the external vibration detection sensor pad 2E is synchronized and subtracted by the adder / subtractor circuit 6 to reduce the vibration of external force and Remove noise It is configured so that, Ru.

This external vibration detection sensor pad 2E is arranged on the same plane as the sensor pads 2A, 2B, 2C, 2D for detecting pressure changes on the body surface, and is not affected by a biological signal, for example, FIG. As shown in Fig. 1 and Fig. 2, it is placed at a location where the foot force is separated.

Note that clearer external vibration and noise can be detected by placing a plate-like weight 2Z on the surface of the external vibration detection sensor pad 2E.

[0055] This weight body 2Z can effectively detect vibration and noise caused by an external force by making the weight per unit area equal to the human standard weight.

[0056] By the way, the arrangement of the sensor pads 2A, 2B, 2C, 2D is a shoulder portion in the case of bedding.

(2A) · Chest part (2B) · Waist part (2C) · Butt part (2D) is desirable, but in the case of a chair, it should be placed under the thigh 'butt part' 'waist' chest part Is desirable.

[0057] The sensor pads 2A, 2B, 2C, 2D and 2E used in Example 1 are filled with foamed urethane resin 22 as shown in FIGS. 3 to 4, and the sensor pads 2A, 2B , 2 C, 2D, and 2E are configured to maintain a constant expansion state, and after the sensor pads 2A, 2B, 2C, 2D, and 2E are deformed by an external force, the external force stops working. It works to quickly restore the original expanded state.

[0058] Further, the sensor pads 2A, 2B, 2C, 2D, and 2E are formed of a rectangular bag-like body formed of two skins 23 and 24 as shown in FIG. In order to maintain its airtightness, the peripheral portions of both epidermis 23 and 24 are formed by being bonded with an adhesive that can maintain airtightness or ultrasonic bonding. In addition, it is desirable to use materials having excellent airtightness such as rubber and soft synthetic resin for the skins 23 and 24 of the sensor pad 21, and in order to further improve the airtightness, it is formed of a plurality of layers. I hope to do it.

[0059] Further, inside the sensor pads 2A, 2B, 2C, 2D and 2E, as shown in FIG. 4, a hard plate 28 is disposed, and the thickness of the plate 28 is reduced in one direction. It is formed in a wedge shape. Of course, the plate material 28 may be a flat plate. With this configuration, when the sensor pad 21 is disposed between the bedding and the body, for example, the movable side (skin side) of the sensor pad 21 is disposed on the body side. The sensor pad 2A, 2B, 2C, 2D can reliably collect changes in air pressure due to changes in the body surface due to or breathing. As a result, the sensitivity of the sensor pads 2A, 2B, 2C, 2D is good. And when the sensor nodes 2A, 2B, 2C, 2D are inserted between the bedding and the body and attached to the body, the movable side of the sensor pads 2A, 2B, 2C, 2D is Even in an uneven body part, the movable member is naturally pressed in the direction of the body by the plate material 28 and is in close contact with the body, so that the detection sensitivity of heart sounds and Z or respiratory waveform can be further improved. Of course, by inserting a thin plate-like sheet (not shown) between the sensor pads 2A, 2B, 2C, 2D and the bed 4 or chair, the detection sensitivity of the biological signal is increased and more accurate measurement is possible. It can be carried out.

In addition, as shown in FIG. 3, by configuring the sensor pads side 2 4A of the piezoelectric sensors 3A, 3B, 3C, 3D, and 3E to be airtight and the other side 24B to be open to the atmosphere, It is configured so that a pressure difference is generated between the air enclosure chamber side and the atmosphere side, and the sensor pad 2A, 2B, 2C, 2D is applied to the piezoelectric sensor 3A, 3B, Since it can be transmitted to 3C and 3D, the heart rate signal and Z or respiratory signal can be extracted at high output. Can be issued.

[0061] In addition, subtle changes in pressure due to external vibration and noise that are trapped in the sensor pad 2E are transmitted to the external vibration piezoelectric sensor 3E, so external vibration and external noise that interfere with biological signal detection. Components can be detected with high output.

[0062] A method of detecting vibration and noise at various places by using a plurality of sensor pads and sensors for detecting external vibration and noise is more effective.

Furthermore, in the above description, the case where the sensor pad side 2 4A of the piezoelectric sensors 3A, 3B, 3C, 3D, 3E is configured to be kept airtight has been described as an example, but the piezoelectric sensors 3A, 3B, Sensor unit with 3C, 3D, 3E attached 24C minute hole 24D that connects the air enclosure chamber side and the atmosphere side is formed so as to allow the air in the air enclosure chamber side to escape with resistance. By configuring, it is possible to prevent the urethane foam resin 22 that has been pressed and shrunk from returning to its original state in an airtight state, and smoothly swell the sensor pads 2A, 2B, 2C, 2D, and 2E. It can be returned to the state.

[0064] In Example 1, as described above, the piezoelectric element 24 is disposed in the chamber 24F of the sensor unit 24C connected to the tip of the pipe 25 to form the chamber. A hole 24B formed in the bottom 24E is attached so as to be closed with an adhesive or the like. Of course, better results can be obtained by occlusion using O-rings or the like.

[0065] The biological signals detected by the sensor pads 2A, 2B, 2C, and 2D detected in this way and the external vibration and noise component signals detected by the sensor pad 2E are as shown in FIG. The signal processing circuit 4A, 4B, 4C, 4D, which is the power of the amplification amplifier and the frequency filter according to the frequency component of the signal, is processed by the four AZD conversion circuits 5A, 5B, 5C, 5D. , 5E is converted into a digital signal by the AZD conversion, and the addition / subtraction circuit 6 adds / subtracts the AZD conversion result, the period calculation circuit 7 calculates the period using the addition / subtraction result in the addition / subtraction circuit 6, and the period calculation circuit 7 The biological information processing circuit 8 converts the cycle calculated in step 4 into cycle data output or Z and heart rate, respiratory rate, body motion and fluctuation data per unit time.

[0066] Further, the AZD conversion circuits 5A, 5B, 5C, 5D, and 5E receive conversion start triggers simultaneously from the synchronization signal generation circuit 15, convert them, output the results to the addition / subtraction circuit 6, and calculate the results. Is output to the period calculation circuit 7. The effect of external vibration and noise is removed by subtracting the conversion result of the external vibration and noise components converted by AZD conversion circuit 5E from the biological signal components AZD converted by AZD conversion circuits 5A, 5B, 5C, and 5D. The biological signal components AZD converted by the AZD conversion circuits 5A, 5B, 5C, and 5D can be added to remove unnecessary pseudo signals and detect only the biological signal. Of course, either order of addition and subtraction may be used.

The cycle calculation circuit 7 calculates the cycle of heartbeat and respiration, and the biological information processing circuit 8 converts it into heartbeat-respiration rate / body motion rate / fluctuation information.

[0068] Further, the position / time generation circuit 14 for outputting the position and altitude information such as GPS information and the absolute time information is connected to the synchronization signal generation circuit 15, and other than the synchronization signal for the AZD conversion of the biological data. In addition, it is connected to the biological information processing 8 and used as a reference time, and is also used for data storage time information and position information.

[0069] Note that the calculation of the period of the biological signal is the same as the method in which the present inventor described the configuration and procedure in the specification of the earlier international application (PCTZJP03Z16185 and PCTZJP03). The description is omitted here.

[0070] As described above, the biological signal detection device 1 according to the first embodiment performs real-time addition by synchronizing the four biological signal data at all times, so that the true biological signal whose time is the same can be obtained. Only signals are added, and pseudo signals such as reflection and random signals such as noise are attenuated by addition because there is a time lag (phase difference) between the four pieces of biological signal data. In other words, if the four sensor pads 2A, 2B, 2C, and 2D and the piezoelectric sensors 3A, 3B, 3C, and 3D are added together, the true biological signal is quadrupled and the other signals are at the level of 1Z4. can do.

[0071] In addition, the saturation signal (large signal) output by the movement of the body rarely occurs simultaneously in the entire body, and this saturation signal is obtained by always adding a plurality of biological signal data in synchronization. The signal can also be reduced. For example, when biosignal detection is performed using four sensor pads 2A, 2B, 2C, 2D and piezoelectric sensors 3A, 3B, 3C, 3D, one of the piezoelectric sensors 3A, 3B, 3C, 3D. Even if a large output occurs due to body movement in one sensor, this signal is not output to the other sensors. Therefore, it is possible to quickly suppress a large output due to a body movement that is harmful to detecting a biological signal.

[0072]

Example 2

FIG. 6 shows a biological signal detection apparatus 1 according to Embodiment 2 of the present invention. The biological signal detection apparatus 1 converts the output signals from the piezoelectric sensors 3A, 3B, 3C, and 3D into digital signals. Since the other configuration and operation are the same as in the first embodiment except that the addition / subtraction processing is performed to add the analog signal without conversion, the same components as in the first embodiment are implemented. The same reference numerals as those in Example 1 are attached, and detailed description thereof is omitted here.

That is, the biological signal detection apparatus 1 according to the second embodiment includes sensor pads 2A, 2B, 2C, and 2D that detect changes in sound or Z and pressure on the body surface caused by biological activity, and the sensor pad 2A. , 2B, 2C, 2D Piezoelectric sensors 3A, 3B, 3C, 3D that sense changes in air pressure, and analog add / subtract that adds the output signals from these piezoelectric sensors 3A, 3B, 3C, 3D as analog signals The circuit 16, one AZD conversion circuit 6 that performs AZD conversion on the signal from the analog addition / subtraction circuit 16, a period calculation circuit 7 that calculates a period using the AZD conversion result, and the period calculation circuit 7 Biological information processing circuit 8 that converts the cycle into heart rate per unit time, respiratory rate 'body motion number, fluctuation information, etc., data storage circuit 12 that stores these biological information, and data for displaying biological information Display circuit 11, computer and interface A computer interface circuit 10 for transmitting data and a data communication circuit 9 for transmitting data via a line. The data storage circuit 12 is connected to a replaceable medium 12A (SD memory card, etc.) in addition to the memory and the hard disk, and can be taken out to the outside.

As described above, the biological signal detection apparatus 1 according to the second embodiment is configured to perform addition processing on a plurality of biological signals as analog signals, and therefore, in the first embodiment, a plurality of channels are necessary. The AZD conversion circuit can be integrated into one, and the circuit can be simplified and the device can be realized at low cost. In addition, by simply synchronizing multiple biological signals easily and adding them in real time at all times, only the real biological signals with the same time are added, and random signals such as pseudo signals and noise due to internal reflections are added. Multiple signals are multiple biological signal data Since there is a time lag (phase lag) between them, the analog signal is attenuated by addition as in the first embodiment.

Of course, also in this Example 2, one or a plurality of external vibrations and noises having the same constitutional force as well as the above four sensor pads for detecting changes in body surface sound or Z and pressure caused by biological activity. The sensor pad 2E for detection is placed in a place where it is not affected by the biological signal, and the signal detected by the sensor pad 2E for external vibration detection is also subtracted from the analog signal by the analog addition / subtraction circuit 16 as described above. By synchronizing and subtracting in real time at all times, it is possible to remove external vibration and noise and obtain a clear biological signal.

[0077] Also, a position / time generation circuit 13 for outputting the position of GPS information, altitude information and absolute time information is connected, and connected to the biological information processing 8 in addition to the AZD conversion synchronization signal of the biological data. Since it is the same as in the first embodiment that it is used for the reference time, and also used for data storage time information and location information, detailed description thereof is omitted here.

[0078]

Example 3

FIG. 7 shows a biological signal detection apparatus 1 according to Embodiment 3 of the present invention. The biological signal detection apparatus 1 according to Embodiment 3 performs AZD conversion using a single AZD conversion circuit. By synchronizing the timing with the analog signal switching circuit, it adds multiple biological signal data, adds only the true biological signal with the same time, and generates random signals such as reflection and noise. The signal is configured to be attenuated by addition.

That is, in the analog signal switching circuit 17, for each of the piezoelectric sensors 3A to 3D,

Maximum biological frequency X 2 times frequency X number of channels

Since the other configurations and operations are the same as those in the first or second embodiment except that the AZD conversion sampling rate and the switching timing are synchronized (shifted) using the above frequencies, the first embodiment is similar to the first embodiment. Alternatively, the same components as those of the second embodiment are denoted by the same reference numerals as those of the first or second embodiment, and detailed description thereof is omitted here.

That is, the biological signal detection apparatus 1 according to the third embodiment includes sensor pads 2A, 2B, 2C, and 2D that detect changes in sound or Z and pressure changes on the body surface caused by biological activity, and the sensors. Piezoelectric sensors 3A, 3B, 3C, 3D that detect changes in air pressure in the Serpad 2A, 2B, 2C, 2D and output signals from these piezoelectric sensors 3A, 3B, 3C, 3D 4B, 4C, and 4D, the analog signal switching circuit 17, one AZD conversion circuit 5, the addition / subtraction circuit 6 for adding / subtracting the AZD conversion result, and the addition / subtraction processed AZD conversion result are used. A cycle calculation circuit 7 for calculating the cycle, a biological information processing circuit 8 for converting the cycle calculated by the cycle calculation circuit 7 into heart rate, respiratory rate 'body motion number, fluctuation data, etc. per unit time; A data display circuit 11 for displaying information, a data storage circuit 12 for storing such biological information, a computer interface circuit 10 for interfacing with a computer, and a data transmission circuit 9 for transmitting data via a line 9 And force is also composed It is. The data storage circuit 12 is connected to a memory 12A in addition to a memory disk and can be taken out externally.

Then, in the biological signal detection apparatus 1 according to the third embodiment, the analog signal switching circuit 17 and one AZD conversion circuit 5 are used to switch the analog signals output from the plurality of sensor pads 2A to 2D. The timing and the timing for AZD conversion are configured so that the sampling and switching timings are shifted for each of the piezoelectric sensors 3A to 3D using a frequency equal to or higher than the above (maximum biological signal frequency X 2 times frequency X number of channels). RU Of course, the sampling frequency of the AZD conversion is also higher than (the maximum biological signal frequency x 2 times the frequency x the number of channels).

[0083] Specifically, when the highest frequency component of the heart sound signal having the highest frequency component of the biological signal is 10 Hz, for example, and the number of channels is 4 channels,

10 X 2 X 4 = 80Hz

By switching analog signals at a frequency of 80 Hz or more, synchronizing multiple biological signal data with one AZD conversion circuit 5 and performing AZD conversion, and performing all the conversion results, the time is reduced. Only the true biological signal is added, and pseudo signals such as reflection and random signals such as noise are attenuated by addition because there is a time lag between multiple pieces of biological signal data.

[0084] With this configuration, a single AZD conversion circuit can be used. Therefore, this type of device can be provided at a low cost by simplifying the circuit.

Therefore, in the third embodiment, the synchronization adjustment circuit 18 for synchronizing the trigger timing of the AZD converter 5 and the switching timing of the analog switching circuit 17 is used. It is configured to synchronize with the conversion circuit 5 and the analog signal switching circuit 17.

[0086] Of course, also in this Example 3, one external vibration and noise having the same constitutional force are used together with the above four sensor pads for detecting changes in sound or Z and pressure on the body surface caused by the biological activity. The sensor pad 2E for detection is placed at a place not affected by the biological signal, and the biological signal detected by the sensor pad 2E for detecting external vibration is also switched by the analog signal switching circuit 17 in the same manner as described above. By subtracting after conversion, external vibration and noise can be removed and a clear biological signal can be obtained.

Further, a circuit configuration in which Example 2 and Example 3 are used in combination can also be used. For example, using the same number of sensors as multiple sensor pads, 2 channels of biological signals are added as analog signals, and the remaining 3 channels of biological signals are synchronized with one AZD conversion circuit and analog signal switching circuit. The same effect can be obtained by operating in the same manner.

Industrial applicability

[0088] As described above, the biological signal detection device according to claim 1 crosses the living body through the biological signal detection sensor pad that detects changes in sound or Z and pressure on the body surface caused by the biological activity. A sensor that senses changes in air pressure within the sensor pad is connected to each sensor pad, and the output signal from this sensor is AZD converted by multiple AZD conversion circuits. Is added in real time by the adding means, the period is calculated by the period calculating means using the addition result, and the calculation period is output to the outside as it is, or the heart rate, respiratory rate, Since it is configured to convert the number of body movements and fluctuations by the conversion means, real biological signals can be instantaneously detected from biological information generated in various parts of the living body without time delay.

[0089] Although there is essentially only one source of biological signals, many pseudo signals and noise due to biological activities are generated in various parts of the living body through blood vessels and bones. In this invention In order to extract a true biological signal from these pseudo signals and noise from the above configuration, the values of biological signals collected from a plurality of sensors are always added in real time without using a storage device. Thus, it is possible to extract a real biological signal from biological information generated in various parts of the biological body, and as a result, improve the cycle calculation accuracy of the biological signal.

[0090] In particular, biological signals such as heartbeat and respiration are active with an autonomous period that is unrelated to the period of the clock we are using, and are basically uncorrelated. It is difficult to extract a true biological signal by the method of storing and comparing data.

Therefore, in the present invention, a means for constantly adding a plurality of biological signals in real time without using a timer circuit or a memory circuit for storing and comparing measurement data for a certain period of time is used. Correlated true biological signals can be extracted, and necessary biological information required without waiting can be output and displayed accurately.

In the present invention, a large body movement signal generated by moving the body during measurement can also be reduced by this means.

Next, the biological signal detection device according to claim 2 has the same configuration force as the biological signal detection device according to claim 1 together with the plurality of biological signal detection sensor pads. An external vibration detection sensor pad is placed in a place where it is not affected by biological signals. A sensor that detects changes in internal air pressure is connected to this external vibration detection sensor pad, and the output signal from this sensor is sent AZD conversion by AZD conversion circuit and subtracting AZD conversion result of sensor pads for external vibration detection by subtracting means to eliminate external vibration and noise In addition to multiple sensor pads, separate sensor pads are placed in a place where the living body does not touch them directly, and sensor output that can also be obtained is output to other sensor outputs. By subtracting in real time all the time, external vibration and noise are removed and clear biological signals are detected. As a result, the calculation accuracy of biological information can be improved, and measurement with conventional devices is impossible. Even when you are in a car with extraneous noise and vibration, you can output periodic data and accurately measure and detect respiratory rate (heart rate, body motion, fluctuation data). [0094] In the biological signal detection device according to claim 3, a plurality of biological signal detection sensor pads for detecting changes in sound or Z and pressure on the body surface caused by biological activity are arranged across the living body. At the same time, a sensor for detecting a change in air pressure in the sensor pad is connected to each sensor pad for detecting a biological signal, and the output signal of each sensor force is sent to the adding means as an analog signal and added in real time. The added analog signal is AZD converted by a single AZD conversion circuit, the period is calculated by the period calculation means using the result of the AZD conversion, and the calculated period is directly output to the outside as data. , Or Z and heart rate per unit time, respiratory rate · body motion · fluctuations are converted by the conversion means, so multiple biological signal data are added as analog signals. This makes it possible to combine expensive AZD conversion circuits and peripheral circuits that were required for multiple channels, and eliminate the need for memory circuits at the same time, simplifying the entire circuit and realizing equipment at low cost. it can. Also, by adding multiple biological signal data in real time with raw data, only real biological signals with no time delay and always the same time are added, and pseudo signals such as reflection and noise are added. In the case of random signals such as those having a time lag among a plurality of biological signal data, the true biological signal can be accurately detected because it is attenuated by addition. In addition, since no memory is used, there is no need to wait for a certain period of time, and a means for continuous addition in real time is used. The information can be output and displayed quickly without time.

The biological signal detection device according to claim 4 is based on the technical premise of the biological signal detection device according to claim 3, and the external vibration having the same configuration force as the biological signal detection sensor pad. A sensor pad for detection is placed in a place where it is not affected by biological signals, and a sensor that detects changes in internal sound or Z and air pressure is connected to this sensor pad for detection of external vibration. By subtracting the signal with an analog subtraction circuit, it is configured to remove external vibration and noise, so the influence from the outside can be removed or reduced, independent of multiple sensor pads. The sensor pad is placed in a place where the living body does not touch it directly, and the sensor output obtained from it is constantly subtracted in real time from the other sensor outputs. The dynamic and noise As a result, it is possible to improve the accuracy of calculation of biological information because it detects a clear biological signal, and it is possible to increase the accuracy of calculating biological information. However, it is possible to accurately measure and detect the respiratory rate 'heart rate · body motion · fluctuation data.

[0096] In the biological signal detection device according to claim 5, a plurality of biological signal detection sensor pads for detecting changes in sound or Z and pressure on the body surface caused by biological activity are arranged across the living body. At the same time, sensors that detect changes in air pressure within the sensor pad are connected to each sensor pad, and the output signals of these sensor powers are converted to analog signal switching circuit switching timing and a single AZD conversion circuit. By synchronizing the timing of conversion, only the true biological signal with the same time is added out of the multiple biological signal data, and pseudo signals such as reflection and random signals such as noise are added by addition. Since it is configured to attenuate, it is possible to provide a device at a low cost by simplifying the entire circuit by using one expensive AZD conversion circuit and omitting the analog addition / subtraction circuit. Can

[0097] Of course, by switching the sampling and timing of AZD conversion using a frequency that is sufficiently higher than the biological signal, for example, higher than 80 Hz (frequency X channel number twice the maximum biological signal frequency X), The biological signal of each channel is a slow signal (at most 10 Hz or less), so this deviation is negligible. As a result, while maintaining the detection accuracy of the biological signal, it is possible to use low-cost and simple circuits and components. This device can be realized.

[0098] In the biological signal detection device according to claim 6, along with the plurality of biological signal detection sensors, the external vibration detection sensor pad having the same structural force is disposed in a place not affected by the biological signal. The sensor pad for detecting external vibration is connected to a sensor that detects changes in internal sound or Z and air pressure, and the output signal from this sensor is sequentially switched by an analog signal switching circuit, and converted to AZD. Since it is configured to eliminate external force vibration and noise by subtracting, external vibration and external noise are detected under the same conditions as the sensor pad that detects changes in sound or Z and pressure on the body surface. It is possible to remove external noise reliably, and as a result, the calculation accuracy of biological information can be improved, and measurement with conventional devices is impossible. De Even when you are in a car with extraneous noise and vibration, you can output periodic data and accurately measure and detect respiratory rate (heart rate, body motion, fluctuation data).

[0099] In the biological signal detection device according to claim 7, the external vibration detection sensor pad is disposed on the same plane as the sensor pad for detecting a change in sound or Z and pressure on the body surface, and the biological signal is detected. By placing it in a place that is not affected by external noise, it is possible to accurately detect external vibration and external noise used in the subtraction process under the same conditions, and as a result, remove external vibration and external noise.

[0100] In the biological signal detection device according to claim 8, the living body (dummy) having no biological signal is placed on the sensor pad by placing a weight on the surface of the external vibration detection sensor pad. The same effect is achieved, the sensitivity of the sensor is increased, and external vibration and noise signals used in the subtraction process can be detected with higher sensitivity. As a result, external vibration and external noise can be removed.

[0101] The biological signal detection apparatus according to claim 9 adds the absolute time (Y • DHM-S) and position data (GPS information, etc.) to the period calculation result, The time can be known at the same time, and the necessary data can be saved simultaneously with the biological information. It can be used for detection and measurement of biological signals while moving in vehicles, etc., or when multiple experiments are performed simultaneously in different locations, so that the start times can be matched to make measurement more efficient. Become.

[0102] In the biological signal detection device according to claim 10, each of the biological signal detection sensor nodes or the external vibration detection sensor pad is configured by enclosing a foamed resin and air inside, Changes in sound or Z and air pressure in each sensor pad are detected by a piezoelectric sensor. The piezoelectric sensor maintains the air pressure on the sensor pad side, while the other side is open to the atmosphere, and the air enclosure chamber side and the air open side Therefore, it is possible to realize signal detection with high output and high sensitivity and fast response speed by utilizing the pressure difference between the air insertion chamber side and the atmosphere open side. In addition, the high output level signal eliminates the need for complicated temperature correction and gain correction that are strong against noise, and it is possible to realize a biological signal device that is easy to handle at low cost without having to select an installation location.

[0103] In the biological signal detection device according to claim 11, the piezoelectric sensor includes an air insertion chamber. By forming a fine hole that communicates with the atmosphere side, and allowing air in the air insertion chamber side to escape with resistance, a self-adhesive foamed resin can be used without using a sealed sensor pad. The repulsive force can be used to constantly send a stable pressure to the sensor. In addition, since it is not a sealed structure, there is no risk of rupture or leakage due to high pressure, and a biological signal device that is structurally inexpensive and safe can be realized.

[0104] The biological signal detection device according to claim 12 can increase the sensitivity of biological signal detection by inserting a plate material into the sensor pad. For example, it is possible to prevent the influence caused by the soft material of the bed or chair, to obtain a stable biosignal output with a high output, and to further free the installation location of the sensor pad. As this plate material, a flat plate or a plate having an inclined surface can be used.

[0105] In the biological signal detection device according to claim 13, since a seat is interposed between the sensor pad and the bed or chair, the output signal level corresponding to the sensitivity of the sensor pad and the sensor force can be increased. As a result, detection with higher accuracy is possible, and the effect of << is also received under the influence of the body shape of the living body and materials such as beds.

Claims

The scope of the claims

[1] A sensor for detecting a change in air pressure in the sensor pad while arranging a plurality of biological signal detection sensor pads for detecting a change in sound or Z and pressure on the body surface caused by biological activity across the living body. Is connected to each sensor pad, the output signal from this sensor is AZD converted by multiple AZD conversion circuits, the AZD conversion results are added in real time by the addition means, and the period is calculated by the period calculation means using the addition results. And the calculation cycle is directly output to the outside, or Z and the heart rate per unit time-inhalation number / body motion number fluctuation are converted by the conversion means. Biological signal detection device.

[2] In the biological signal detection device according to claim 1, in addition to the plurality of biological signal detection sensor pads, an external vibration detection sensor pad having a similar component force is disposed in a place not affected by the biological signal. The external vibration detection sensor pad is connected to a sensor that senses changes in the internal air pressure, and the output signal from this sensor is AZD converted by the AZD conversion circuit. Conversion result force A biological signal detection device that removes vibration and noise of external force by subtracting the AZD conversion result of the external vibration detection sensor pad by a subtraction means.

[3] A sensor for detecting a change in air pressure in the sensor pad while arranging a plurality of biological signal detection sensor pads for detecting sound or Z and pressure changes on the body surface caused by biological activity across the living body. Connected to each sensor pad for detecting a biological signal, the output signals from each of these sensors are sent as analog signals to the adding means and added in real time, and the added analog signals are processed by one AZD conversion circuit. AZD conversion, and using the result of the AZD conversion, the cycle is calculated by the cycle calculation means, and the calculated cycle is output to the outside as it is, or the heart rate and respiratory rate per unit time and Z A biological signal detection apparatus configured to convert the number of motions to fluctuations by a conversion means.

[4] An external vibration detection sensor pad having the same configuration as the above-described sensor pad for detecting a biological signal is arranged in a place not affected by the biological signal, and the external vibration detection sensor pad includes an internal sound or Connect sensors that detect changes in Z and air pressure, 4. The biological signal detection device according to claim 3, wherein the output signal having the sensor force is subjected to subtraction processing by an analog subtraction circuit to remove external vibration and noise.

[5] A sensor for detecting a change in air pressure in the sensor pad while arranging a plurality of biological signal detection sensor pads for detecting sound or Z and pressure changes on the body surface caused by biological activity across the living body. Is connected to each sensor pad, and the output signal of these sensors is synchronized with the switching timing of the analog signal switching circuit and the timing of AZD conversion with one AZD conversion circuit, so that multiple biological signal data Or a pseudo signal such as a reflection or a random signal such as a noise is attenuated by the addition. The biological signal detection device according to claim 4.

[6] An external vibration detection sensor pad having the same configuration as the above-described sensor pad for detecting a biological signal is disposed in a place not affected by the biological signal, and the external vibration detection sensor pad includes an internal sound or A sensor that detects changes in Z and air pressure is connected, and the output signal of this sensor force is subtracted by an analog subtraction circuit to eliminate external vibration and noise. The biological signal detection device described.

[7] The sensor pad for detecting external vibration is arranged on the same surface as the sensor pad for detecting a change in sound or Z and pressure on the body surface, and is arranged in a place not affected by a biological signal. The biological signal detection device according to claim 2, claim 4, or claim 6.

8. The biological signal detection device according to claim 7, wherein a weight body is placed on the surface of the external vibration detection sensor pad.

[9] The biological signal detection device according to any one of claims 1 to 8, wherein absolute time and position information are added to the period calculation result.

[10] Each of the biological signal detection sensor pads or the external vibration detection sensor pads is configured by enclosing a foamed resin and air inside, and changes in sound or Z and air pressure in each of the sensor pads are not detected. The piezoelectric sensor senses the sensor. Any one of claims 1 to 9, wherein the air pressure on the sensor pad side is maintained, the other side is opened to the atmosphere, and a pressure difference between the air enclosure chamber side and the air release side is detected. The biological signal detection device according to 1.

[11] The piezoelectric sensor is characterized in that a fine hole that communicates with the air insertion chamber side atmosphere side is formed so as to penetrate the air insertion chamber side air with resistance. The biological signal detection device according to claim 10.

12. The biological signal detection device according to claim 11, wherein a plate material is disposed in the sensor pad.

[13] The biological signal detection device according to any one of claims 1 to 12, wherein a seat is interposed between the sensor pad and a bed or a chair.