KR101815276B1 - Electroencephalogram detecting apparatus for optimizing wearer comfort and measure reliability - Google Patents

Electroencephalogram detecting apparatus for optimizing wearer comfort and measure reliability Download PDF

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Publication number
KR101815276B1
KR101815276B1 KR1020160105157A KR20160105157A KR101815276B1 KR 101815276 B1 KR101815276 B1 KR 101815276B1 KR 1020160105157 A KR1020160105157 A KR 1020160105157A KR 20160105157 A KR20160105157 A KR 20160105157A KR 101815276 B1 KR101815276 B1 KR 101815276B1
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South Korea
Prior art keywords
reel
electrode
state
contact
delete delete
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KR1020160105157A
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Korean (ko)
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양석조
김민규
서영대
황정진
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충남대학교 산학협력단
(주)로임시스템
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Priority to KR1020160105157A priority Critical patent/KR101815276B1/en
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/04Measuring bioelectric signals of the body or parts thereof
    • A61B5/0476Electroencephalography
    • A61B5/0478Electrodes specially adapted therefor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/05Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radiowaves
    • A61B5/053Measuring electrical impedance or conductance of a portion of the body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/68Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6802Sensor mounted on worn items
    • A61B5/6803Head-worn items, e.g. helmets, masks, headphones or goggles
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/68Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813Specially adapted to be attached to a specific body part
    • A61B5/6814Head
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/68Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/683Means for maintaining contact with the body
    • A61B5/6831Straps, bands or harnesses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/72Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7225Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation

Abstract

The present invention relates to a method and apparatus for guiding the tightening strength to a minimum tightening strength suitable for electroencephalogram measurement when the human's head circumference is tightened and minimizing inconvenience due to head tightening while ensuring the reliability of electroencephalogram measurement And an EEG measurement apparatus that optimizes the wearing convenience and the measurement reliability in which the process of wearing in such an optimal state is very convenient.

Description

TECHNICAL FIELD [0001] The present invention relates to an electroencephalogram measuring apparatus and an electroencephalogram measuring apparatus,

The present invention relates to a method and apparatus for guiding the tightening strength to a minimum tightening strength suitable for electroencephalogram measurement when the human's head circumference is tightened and minimizing inconvenience due to head tightening while ensuring the reliability of electroencephalogram measurement And an EEG measurement apparatus that optimizes the wearing convenience and the measurement reliability in which the process of wearing in such an optimal state is very convenient.

Electroencephalogram (EEG) is detected by various waveforms such as alpha waves, beta waves, theta waves, delta waves, and gamma waves according to the degree of activity of the brain, and is detected as a relatively weak signal compared to other bio signals. And the contact impedance generated between the electrode for the head and the skin for the head is greatly affected.

Such an apparatus for measuring the brain wave generally has a shape to tighten around the head, and when the head is worn on the head, there is a problem in that the reliability of the EEG measurement is deteriorated due to the variation of the contact impedance, .

In order to solve the problem of lowering the reliability, Japanese Patent Application Laid-Open No. 10-2015-0028451 judges a contact error by using a pressure sensor, an optical pulse wave sensor, an acceleration and a gyro sensor, and judges whether noise is generated according to a user's movement .

In addition, Japanese Patent No. 10-0868071 judged the degree of contact failure of the electrode by the voltage applied to the impedance between the electrode output lines.

However, the technique of monitoring the contact state between the electrode and the skin to determine the wearing state of the EEG measuring device is a useful technique, but it is difficult to know how the optimum wearing state is and how to make such wearing state It is even more important in EEG devices.

Particularly, in various fields utilizing brain waves, it is necessary to wear the head for a long time, and the feeling of wearing is very important.

That is, the higher the head tightening strength is, the more reliable the measurement can be achieved, but it is very difficult to wear on the head for a long period of time under a tight tightening condition for the measurement reliability.

KR 10-2015-0028451 A 2015.03.16. EN 10-0868071 B1 2008.11.04.

Therefore, the object of the present invention is to optimize the comfort and measurement reliability by measuring the EEG with accurate waveform while minimizing the inconvenience even when wearing it on the head for a long time, And to provide an EEG measurement device.

In order to achieve the above object, the present invention provides a brain wave measuring apparatus comprising: a hair band (10) worn around a human head and equipped with an electrode (20) for sensing a bioelectric potential signal in contact with the skin; (30) which adjusts the degree of tightening in accordance with the rotation of the dial (31) while the hair band (10) is worn on the head; The contact state between the electrode 10 and the skin that varies according to the rotation of the dial 31 is detected and monitored to adjust the tightening strength until the contact state reaches a predetermined satisfactory state and at the same time, And a signal processor (40) for guiding the signal to a human perceivable signal so as to stop the electroencephalogram signal and for detecting the EEG from the bioelectrical potential signal sensed by the electrode (10).

The signal processor 40 gradually changes the alarm mode as the contact state approaches the satisfied state.

The signal processor (40) estimates and guides the dial rotation angle of the jaws (30) so that the contact state reaches the satisfactory state.

And the signal processor (40) outputs a signal of contact good judgment when the contact state maintains the satisfactory state for a predetermined duration.

The signal processor 40 guides the user to move his or her body after the contact state satisfies the satisfaction state and guides the user to tighten the contact state again with the tightening dog 30 when the contact state is out of the satisfaction state.

The contact state is a contact impedance between the electrode 20 and the skin estimated from the in-phase noise power introduced into the bioelectrical potential signal.

The signal processor 40 is characterized in that the degree of convergence of the contact impedance according to the value of the contact impedance or the rotation of the dial is set to the satisfying state.

And the common-mode noise is a frequency component of commercial electricity.

And the signal processor 40 determines a contact state by a difference in contact impedance between the electrodes.

The signal processor 40 and the jaws 30 are fixed to the outer surface of the hair band 10 and are fixed at positions opposite to each other with respect to the inner center surrounded by the hair band 10. [

The jaws 30 are pulled by the wire 32 and spaced apart from their positions fixed to the hair bands 10 and the wire 32 is wound up by a length proportional to the rotation angle of the dial 31 And the hedge band 10 is tightened quantitatively.

According to the present invention as described above, since the hair band 10 is tightened only to the minimum strength required to ensure the reliability of EEG measurement, there is a feeling of comfort that minimizes the inconvenience even when the head is tightened, , And a dial type jig dog which can adjust the tightening strength and fine adjustment of the tightening strength according to the guide is not only convenient to use but also has the precision of adjustment that can be precisely adjusted to the optimum tightening strength.

Further, according to the present invention, the user can recognize the situation in which the contact state of the electrode is close to the satisfactory state, so that the tightening strength can be adjusted more precisely.

In addition, since the present invention performs the process of re-adjusting the tightening strength by confirming the influence of the body movement in advance, it ensures the reliability of the EEG to be measured while being actuated while wearing on the head.

1 is a perspective view of an EEG apparatus according to an embodiment of the present invention;
FIG. 2 is a perspective view showing a portion where the wire 32 is present in FIG. 1; FIG.
Fig. 3 is a perspective view (a) showing the jaws 30, a perspective view (b) showing the joining position when joining the elements of the jaws 30, and a reel presser 31d (C) of the dial 31 showing the user.
4 is a cross-sectional view showing various embodiments of the installation structure of the electrode 20. Fig.
FIG. 5 is a partial cross-sectional view of an electric circuit configuration of a brain wave measuring apparatus according to an embodiment of the present invention and a hair band 10 put on a person's head.
6 is a flowchart of an EEG measurement method performed by the signal processor 40. Fig.
FIG. 7 is a front perspective view (a) and a rear perspective view (b) of an embodiment in which an EEG measuring device according to an embodiment of the present invention is installed on a cap.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view of an EEG apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view of an EEG apparatus according to an embodiment of the present invention. 3 shows an exploded perspective view (a) of the jaw jaw 30, an exploded perspective view (b) showing the joining process of the jaw jaws 30, There is shown a perspective view (c) of the dial 31 showing that the electrode 20 can be made of the same material. Fig. 4 shows a cross-sectional view of the portion where the electrode 20 is installed to show various configuration examples of the electrode 20.

1, a brain wave measuring apparatus according to an embodiment of the present invention includes an electrode 20, a jaw opening 30, a signal And a processor 40 mounted thereon.

Here, the electrode 20 is attached to the inner surface of the hair band 10 to contact the hair band 10 with the scalp or forehead when the hair band 10 is put on the head, and the jig dog 30 has a hair band 10 And the signal processor 40 adjusts the contact state between the electrode 20 and the skin at a position opposite to the jig dog 30 by adjusting the degree of head tightness of the dial 30 in accordance with the rotation of the dial 31 Thereby providing a feeling of wearing stability that minimizes the bias when the present invention is worn on the head.

The signal processor 40 detects the contact state between the electrode 20 and the wearer's skin which varies according to the tightening strength when the wearer of the present invention rotates the dial 31 of the jaws 30 to tighten the head To guide the signal to a human perceivable signal to control the tightening intensity until the contact condition reaches a predetermined minimum satisfaction and to stop the instantaneous tightening to the minimum satisfactory state, ) To detect a brain wave by differentially computing the bioelectric potential signal.

Here, the minimum satisfactory state is set in advance as a contact state corresponding to the smallest value of the tightening strength during the contact state suitable for brain wave measurement. That is, in order to detect the brain waves, the electrode 20 must be brought into close contact with the skin at a predetermined pressing force or more. However, the minimum satisfying state corresponding to the minimum pressing force is set in advance.

 As will be described later, in a specific embodiment of the present invention, the contact state is the magnitude of the contact impedance between the electrode 20 and the skin. Therefore, the minimum satisfactory state is a minimum required value of the contact impedance, Or a contact impedance difference between the two electrodes, which is the minimum required when the impedance converges to a specific value.

The electroencephalogram is guided to an optimal wearing state that can accurately measure the electroencephalogram without being tightened by the jaws 30 more than necessary, and then the electroencephalogram is measured from the bioelectrical potential signal detected through the electrode 20, Measurement becomes possible.

The present invention thus constituted is convenient to wear because it is guided by appropriate tightening strength when worn on the head, and it is possible to minimize the inconvenience even if it is worn on the head for a long time, And the hair band 10, the electrode 20, the jigger 30 and the signal processor 40, which are components for this, will be described in detail.

As shown in FIGS. 1 and 2, the hair band 10 is formed in the shape of a band that winds around the head. The hair band 10 is cut at a certain position and fixed to one side of the cut portion, Is pulled by the wire 32 wound around the fastener 30 quantitatively by a length proportional to the rotation angle of the dial 31 and pulled toward the fastener 30 by the portion spaced apart from the fastener 30 You can reduce the total length of your head. Thus, the degree of head tightening by the hair band 10 is controlled quantitatively according to the rotation angle of the fastener 30.

In a specific embodiment, the hair band 10 includes a wire guard 11 extending from one side of the broken portion where the jaws 30 are fixed and providing a passage toward the other side of the broken portion, And a band portion 12 extending from one side to enter the inside of the wire protector 11 so that the wire 32 pulls the end portion of the band portion 12 through the inside of the wire protector 11. Therefore, the wire 32 is wrapped by the wire guard 11 and is not exposed to the outside.

In addition to the jaws 30, the hair band 10 is also provided with an electrode 20, which contacts the forehead or scalp at the head with two heads, is electrically connected to the electrode 20, The processor 40 is mounted on one of the outer surfaces.

Here, the jaws 30 may be mounted on the hair band 10 at a position convenient for the user to operate the hair band 10 with his / her head covered.

The signal processor 40 is mounted such that the hair band 10 is positioned in a direction opposite to the jaw opening 30 with respect to the inner center surrounded by the hair bands 10 with the hair band 10 on the head, Close to the center of the head is good.

For example, when the hair band 30 is placed near one of the ears while the hair band 10 is put on the head, the signal processor 40 is positioned near the opposite ear, So that the hair bands 10 are not tilted to one side even if they are in a state of wearing the hair bands 10 equipped with the signal processor 40.

On the other hand, the band portion 12 of the hair band 10 may be composed of an elastic band elastically stretching against the pulling of the wire 32 and accumulating a restoring force to shrink. In this case, although the total length of the head banded by the hair band 10 is not quantitatively reduced by the expansion and contraction of the elastic band even if the wire 32 is quantitatively reduced in proportion to the rotation angle of the dial 31, Is quantitatively changed.

On the other hand, the hair band 10 may be partially constituted by elastic bands in other sections than the band section 12. [

As described above, the jig 30 is pulled by the wire 32 with the other part spaced apart from the fixed position in the outer surface of the hair band 10, and a length proportional to the rotation angle of the dial 31 Referring to FIG. 3, the base member 34 is fixed to the hair band 10, and the base member 34 is rotated in one direction only A dial 31 coupled with the dial 31 to allow the rotation to be precisely adjusted at a predetermined angular interval, provided with a latch function for preventing reverse rotation for each rotation position divided by a predetermined rotation angle, And a winding reel (33) for winding and pulling the wire (32).

Specifically, the base member 34 includes a reel accommodating space 34a that is opened in a direction opposite to the surface fixed to the hair band 10, a protruding portion 34a that protrudes in the opening direction at the center of the reel accommodating space 34a, An internal gear 34d formed on the inner circumferential surface of the opening of the reel accommodating space 34a and surrounding the opening of the reel accommodating space 34a along the circumferential direction, And an insertion port 34e formed to penetrate the end of the wire 32 through the side surface into the reel receiving space 34a. Here, the internal gear 34d is formed in a sawtooth shape to cooperate with the stopper 31a of the dial 31, which will be described later, to perform a latch function.

The take-up reel 33 is a component that allows the rotation shaft 34b to be inserted into the central through hole 33b and into the reel accommodating space 34a so that the rotation shaft 34b can be rotated around the axis, A fixing hole 33a extending to the central through hole 33b is formed on the outer circumferential surface of the wire 32 to wind the end of the wire 32 into the fixing hole 33a and then the wire 32 is rotated 32) is wound on the turning surface. On the surface of the take-up reel 33 accommodated in the reel accommodating space 34a facing the opening direction of the reel accommodating space 34a is formed a concavity and convexity 33c which draws a circle around the central through hole 33b .

The dial 31 is a component that pushes the take-up reel 33 into the reel accommodating space 34a of the base member 34a and covers the opening portion of the reel accommodating space 34a, A latch portion 31b provided on the outer peripheral surface of the latch portion 31b so as to protrude from the outer peripheral surface of the base member 34 internal gear 34d, A stopper 31a that is inserted between the stopper 31a and the latch portion 31b to allow only unidirectional rotation and maintains the inserted state in the reverse rotation so as not to allow reverse rotation, A reel crimping portion 31d having a portion that is in close contact with the periphery of the central through hole 33b of the take-up reel 33 and a threaded portion 34c of the rotating shaft 34b after passing through the reel press portion 31d. And a bolt 31e which is fastened to the rotation shaft 34b by pressing the take-up reel 33 with the reel press portion 31d.

The assembling process of the fastener 30 will be described with reference to FIG. The end of the wire 32 is inserted into the insertion hole 34e of the base member 34 and then fixed to the fixing hole 33a of the take-up reel 33. Thereafter, And is inserted into the reel accommodating space 34a so that the rotating shaft 34b can rotate freely about the axis. The dial 31 covers the opening of the reel accommodating space 34a and then the bolt 31e is rotated through the hole 31f at the outer center so as to be screwed into the female screw groove 34c of the rotary shaft 34b . Thus, the reel compressing portion 31b presses the winding reel 33 by being pushed by the head of the bolt 31e, thereby limiting the axial movement of the take-up reel 33 and permitting rotation only.

3 (b) and 3 (c), the reel compressing portion 31d can be put in a pressed state and a protruding state, so that the dial 31 can be pressed against the base member 34 The unevenness 31f of the dial 31 and the unevenness 33c of the take-up reel 33 are engaged with each other and the stopper 31a is fitted in the internal gear 34d. That is, the dial 31 is allowed to rotate unidirectionally only by the cooperation of the stopper 31a and the internal gear 34d, and when the dial 31 is rotated, the take-up reel 33 rotates and the wire 32 is wound .

However, when the dial 31 is slightly pulled away from the base member 34, the reel presser 31d is in a state in which the take-up reel 33 is pressed and only the latch portion 31b moves in the pulling direction, The engagement between the projections 31c of the dial 31 and the projections and recesses 33c of the take-up reel 33 is released so that the take-up reel 33 can rotate freely. In this state, the wound wire 32 can be loosened.

The jigger 30 thus configured adjusts the pulling length of the wire in units of gear pitch of the internal gear 34d and controls the pulling length of the wire by rotating the dial 31 so that the pulling length of the wire can be easily controlled And the strength of tightening the hair with the hair band 10 can be gradually changed and controlled by gradually increasing the pulling length of the wire.

The adjustment of the head tightening strength can be adjusted according to the guidance of the signal processor 40 described later, so that it is prevented that the head tightening strength is tightened too tightly, and the contact surface pressure between the electrode and the skin As shown in FIG.

The electrode 20 is mounted on the inner surface of the hair band 10 to contact the hair band 10 on the scalp or forehead when the hair is put on the head. These electrodes 20 are provided so as to be spaced apart from each other, and sense the bioelectric potential signal of the contacted skin. In the embodiment for explaining the present invention, it is assumed that two electrodes 20 are mounted.

4, one end of the compression spring 21 is fixed to the hair band 20 via the compression spring 21 between the inner surface of the hair band 10 and the electrode, 4) of fixing the other end of the spring 21 to the electrode 20, a method of fixing the other end of the spring 21 to the electrode 20 by fixing the other end of the spring 21 to the electrode 20 A method of fixing the electrode (FIG. 4B), a method of fixing the electrode 20 to one side of the inner side of the hair band 10 and a plate spring slightly protruding toward the skin (FIG. 4C), and (D in FIG. 4) in which a flexible electrode is used as an electrode mounted on a flexible PCB or a fiber electrode for fixing one side to the inner side of the hair band 20, (Or contact surface pressure) between the electrode and the skin when the hair band 10 is tightened Allowing it avoids.

This makes it possible to reduce the contact impedance between the electrode 20 and the skin while not excessively tightening the hair band 10, thereby enhancing the reliability of the living body signal and relieving the user from inconvenience of being pressed on the electrode 20 Make it comfortable to wear and to wear well.

As another embodiment of the hair band 10, a configuration in which the head circumference is wrapped around only about half, and a structure having a circular restoring force is formed at the time of bending, and a structure for installing the signal processor 40 And the other end may be configured to have the structure for installing the jig 30. At this time, it is preferable that the structures of both end portions are symmetrical.

A hooking structure (not shown) such as a ring or a ring for hanging the wire 32 is installed at one end of the signal processor 40. Here, the latching structure (not shown) may have a structure in which the wire 32 can be hooked on the button for turning the signal processor 40 on and off.

By constructing the hair band 10 having such a structure, if the wire 32 is worn on the head while being hooked on the hook structure, it is convenient to wear it and is also convenient to peel it off the head. In addition, when the wire 32 is rotated by the rotation of the dial 31, the hair band 10 is burnt and pulled to the occiput, so that the contact between the electrode 20 and the skin is improved, So that the inconvenience due to the pressure can be reduced.

The signal processor 40 will be described with reference to FIGS. 5 and 6. FIG.

FIG. 5 is a diagram for explaining an electric circuit configuration of an EEG apparatus according to an embodiment of the present invention, and shows a partial cross-sectional view of a hair band 10 on a human head and a block diagram of the signal processor 40 have.

6 is a flowchart of the EEG measurement method performed by the signal processor 40. FIG.

The signal processor 40 includes an EEG detector 42 electrically connected to the electrodes 20 (20-1 and 20-2) to receive and process a bioelectrical potential signal sensed by the electrode 20 to acquire an EEG signal, A contact state monitoring unit 43 for detecting and monitoring the contact state between the electrodes 20 (20-1, 20-2) and the skin, and a speaker, a lamp, and a vibration element as means for recognizing the situation to be guided to the wearer The contact state between the electrode 20 and the skin is monitored prior to acquiring the brain waves with the alarm unit 44 for communicating with the external device, the communication module 45 for communicating with the external device, and the EEG detecting unit 42, And a controller 41 for guiding the output signal of the alarm unit 44 so as to reach the satisfactory state and controlling the EEG detector 42 to acquire the best frequency.

The EEG detector 42 separately amplifies each of the bioelectrical potential signals detected by the two electrodes 20: 20-1 and 20-2 with amplifiers G1 and G2, (G1, G2) and a single differential operator (G1). However, the present invention is not limited thereto. For example, in the case of the present invention, Patent No. 10-1579517 filed by the applicant for patent and registered may be adopted.

The contact state monitoring unit 43 is configured to set the contact state between the electrode and the skin to be a magnitude of the contact impedance. To this end, the contact state monitoring unit 43 mixes the bioelectrical potential signal detected by the electrodes 20 (20-1, 20-2) An in-phase noise detector 43a for detecting the power of the common-mode noise, and an impedance estimator 43b for estimating the contact impedance between the electrode 20 and the skin from the in-phase noise power.

As a technique for monitoring the contact state of an electrode, there is a method of artificially detecting a current flowing by applying a voltage to the electrode. As disclosed in Japanese Patent No. 10-0868071, a separate impedance element is provided between the output lines of both electrodes And a method of determining the contact state of the electrode with a voltage applied to the impedance element. Thus, the present invention can be utilized.

However, in the present invention, it is meaningful to determine the contact state by extracting only the power of the common-mode noise mixed with the bioelectrical potential signal detected by the electrodes 20 (20-1, 20-2). That is, if the contact state of the electrode is determined from the detection signal of the electrode including the abnormal signal, such as a living body signal other than the common-mode noise, a judgment error of the contact state may occur due to the characteristics of the abnormal signal.

The common-mode noise at this time can be a commercial 60 Hz frequency component (50 Hz frequency component in some countries) which is normally detected in the human body. In this case, it is preferable that the in-phase noise detector 43a detects the in-phase noise power from the bioelectrical potential signals individually amplified by the amplifiers G1 and G2.

In another embodiment, the in-phase noise may be a signal of a specific pattern or a signal having a specific frequency that is artificially applied to the human body through the reference electrode by providing a separate reference electrode. However, In order to pursue it, it is preferable to use frequency components of commercial electric power.

When the in-phase noise power is estimated, it can be obtained by frequency analysis or correlation analysis, and it is separately calculated for each bioelectrical signal detected for each electrode.

The impedance estimator 43b estimates the contact impedances Z1 and Z2 between the electrodes 20 (20-1 and 20-2) and the skin by applying the calculated in-phase noise power to a preset rule.

Here, the preset rule is adopted as a method of estimating the contact impedance as a smaller value as the common-mode noise power becomes larger, for example, a first rule for setting the contact impedance to be in inverse proportion to the in- Assuming that the contact impedance gradually decreases as the pitch of the gear 34d is rotated, the maximum coincident noise power converged from the trend of the phase noise power is estimated on the assumption that the contact impedance gradually decreases in a graph of the step wave form, Any one of the second rules for estimating can be used.

For example, in the second rule, a value indicating the degree of convergence of the contact impedance can be calculated from the ratio of the current common-mode noise power to the estimated maximum common-mode noise power.

The control unit 41 includes a contact state judging unit 41a for judging the contact state of the electrode in accordance with the estimated common mode noise power and an alarm mode selecting unit 41b for selecting the alarm mode according to the determined contact state, It monitors the change of the contact impedance due to the rotation of the dial 31 of the jig dog 30 to guide the rotation of the dial 31 so as to be in a state of meeting the predetermined contact impedance and then detects the EEG after reaching the contact impedance satisfactory state .

The EEG measurement method according to the control of the controller 41 will be described with reference to FIG.

According to the EEG measurement method of the present invention, the contact state monitoring unit 43 is operated to perform the first tightening inducing step S10 and the second tightening guiding step S20, and then the EEG detecting unit 42 is operated And performs an EEG detection step S30.

The first tightening induction step (S10) is a step of tightening the hair band (10) with the jig dog (30) until reaching a preset contact impedance satisfactory state and guiding the hair band (10) Phase noise power is detected in the bio-potential signal detected by the electrodes 20 (20-1, 20-2) (S11), the contact impedance between the electrodes 20 (20-1, 20-2) 20-1 and 20-2 and the contact state between the electrodes 20 (20-1, 20-2) and the skin in accordance with the estimated contact impedance (S13). If the contact state is not satisfied, To the alarm unit 44 so as to tighten the hair band 10 until the hair band 10 is reached.

Here, the judgment on the contact state is differentially applied according to a predetermined satisfying condition. That is, if the satisfied state is a predetermined contact impedance value, the values are compared. If the satisfied state is the contact impedance, the convergence degree is determined. If the satisfied state is predetermined by the contact impedance difference between the two electrodes, do. In more detail, since the contact impedance tends to converge to a certain value as the hair band 10 is stepwise tightened with a slight difference in strength using the jig dog 30, the stopping point of fastening is judged by the degree of convergence And the contact impedance difference between the two electrodes decreases as the contact state of the electrode becomes better, so that it is possible to determine the stopping point of the tightening due to the contact impedance difference.

On the other hand, at the time of guiding to the alarm unit 44, the alarm system gradually changes as the contact state of the electrode becomes closer to the satisfactory state, so that the closer the wearer of the present invention is to the state of being satisfied, do. For example, when an alarm is output in a manner of outputting a specific sound, light, or vibration at intervals of time, a method of gradually narrowing the output time interval as closer to the satisfactory state can be adopted.

As another embodiment, it is possible to estimate the rotation angle of the dial 31 of the jig 30 in order to reach the satisfactory state by comparing the currently determined contact state with the fulfilled state, and to rotate the dial 31 by the estimated rotation number It is good to guide. The contact impedance is also reduced by drawing in a graph close to the step wave. As a result, a change in the contact impedance due to one pitch tightening can be obtained, It is possible to estimate the rotation angle of the dial 31 of the jigger 30 to reach the satisfaction state based on the variation trend.

When the hair band 10 is tightly guided and the contact state reaches the satisfactory state, it is checked whether the satisfaction state is maintained for a predetermined duration (S15). If it is not maintained for the predetermined duration, the hair band 10 ).

Then, when the contact state is maintained for the predetermined duration, the signal of the contact good decision is output to inform the wearer of the contact state. The signal of the contact good decision is satisfied when it is distinguished from the output signal for guiding the hair band 10 to tighten, and a method of stopping the signal output can also be used.

When the contact good judgment result is obtained in this way, the second tightening induction step (S20) is performed.

The second tightening induction step (S20) is a step of inducing the user to readjust the tightness by monitoring the contact state of the electrode when the wearer moves, and after the wearer guides the body to move (S21) (S22). At this time, if the contact state deviates from the satisfactory state, the hair band 10 is instructed to tighten again (S23).

When guiding the tightening again, it is preferable to estimate and guide the dial rotation angle of the jaws 30 to reach the satisfactory state. The sound or electrolytic when the stopper 31a is caught between the teeth of the internal gear 34d and the teeth when the wearer rotates the dial 31 can be recognized as a tactile sensation. For example, when the internal gear 34d If it is estimated that the state of satisfaction will be reached by rotating by three pitches, it is guided to rotate by three pitches.

Here, it is preferable that the body movement of the wearer is guided by head movement.

In this manner, the second tightening inducing step S20 is performed to start the EEG detecting unit 42 to detect the EEG when the contact state is maintained in the satisfactory state even if there is body movement.

During the EEG detection step S30, the contact state monitoring unit 43 is continuously or intermittently operated to monitor the contact state and guides the hair band 10 to be further tightened when it is out of the state of meeting the monitoring result It is good.

Accordingly, the present invention can be applied to the first and second tightening guiding steps (S10, S20) to ensure the reliability of the EEG measurement and to easily ward the user in an optimum state in which the inconvenience of pressing the head can be minimized In order to reliably measure EEG while enjoying everyday life while wearing it on his head, he monitors the change of electrode contact state according to the mode of body movement and controls the tightening strength, Can be measured.

FIG. 7 is a front perspective view (a) and a rear perspective view (b) of an embodiment in which the brain-wave measuring apparatus according to the embodiment of the present invention is installed in the cap 50. FIG.

Referring to FIG. 7, the hair band 10 is fixed to the inside of the cap 50 so that the hair is put on the hair band 10 when the cap 10 is worn on the head. The jigger 30 is exposed to the outside through the side surface of the cap 50. The signal processor 40 is also exposed to the outside of the cap 50 on the opposite side.

By attaching the present invention to the cap 50 as described above, it is possible to increase the feeling of wearing stability, so that the fluctuation of the contact state due to the body movement can be reduced as much as possible. Even if the tightening strength by the fastener 30 is further reduced do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, . ≪ / RTI > Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

10: Hair band
11: wire protector 12: band portion
20, 20-1, 20-2:
21: compression spring 22: leaf spring
30: Joey Dog
31: dial 31a: stopper 31b: latch portion
31c: concavity and convexity 31d: reel crimping portion 31e: bolt
31f: hole
32: Wire
33: take-up reel 33a: fixed hole 33b:
33c: unevenness
34: base member 34a: reel accommodating space 34b:
34c: female thread groove 34d: internal gear 34e: insertion hole
40: Signal processor
41:
41a: Contact State Determination Unit 41b: Alarm Type Selection Unit
42: EEG detector
43: contact state monitoring unit
43a: a common-mode noise detecting unit 43b:
44:
45: Communication module
50: hat

Claims (11)

  1. A hair band (10) worn around the periphery of a person's head and having an electrode (20) on its inner surface for sensing a bio-potential signal in contact with the skin;
    A reel accommodating space 34a in which an internal gear 34d is formed on the inner peripheral surface is formed in a base member 34 which is fixed to the hair band 10 and then the reel 33 to be wound around the wire 32 is freely rotated And a stopper 31a provided between the inner gear 34d and the inner gear 34d for allowing only unidirectional rotation and not being allowed to rotate in the reverse direction The rotation of the take-up reel 33 causes the wire 31 to be pulled by the wire 32 while the hair band 10 is worn on the head, The wire 31 is wound around the base member 10 while restricting the axial movement of the take-up reel 33 and allowing only the rotation of the take-up reel 33, When the stopper 31a is pulled apart from the stopper 31, The wires 32 may pull the tightening piece (30) so wound around by the departure from (34d) allows the free rotation of the take-up reel 33, a take-up reel (33);
    The contact state between the electrode 10 and the skin that varies according to the rotation of the dial 31 is detected and monitored so that the dial rotation angle of the fastener 30 for the contact state to reach the pre- 34d in accordance with the variation of the electrode contact impedance according to the one-pitch tightening, guidance is given to a human-recognizable signal, the tightening strength is adjusted until the contact state reaches a satisfactory state, Guiding the user to move the body after the contact state satisfies the satisfactory state, and when the contact state is out of the satisfactory state, guide the user to tighten with the tightening dog (30) again, A signal processor 40 that satisfies the above-described satisfaction condition and then detects brain waves from the bioelectrical potential signal sensed by the electrode 10;
    And an electroencephalogram (EEG) measuring device.
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KR1020160105157A 2016-08-19 2016-08-19 Electroencephalogram detecting apparatus for optimizing wearer comfort and measure reliability KR101815276B1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006006665A (en) 2004-06-25 2006-01-12 Nou Kinou Kenkyusho:Kk Brain function analyzing system
JP2006014833A (en) 2004-06-30 2006-01-19 Olympus Corp Brain function determination system
US20090259137A1 (en) 2007-11-14 2009-10-15 Emotiv Systems Pty Ltd Determination of biosensor contact quality
JP4778595B2 (en) * 2009-12-15 2011-09-21 パナソニック株式会社 Electrode wearing state judging system, electrode wearing state judging method and program thereof
JP4921621B2 (en) 2010-06-14 2012-04-25 パナソニック株式会社 EEG measurement system, EEG measurement method and program thereof
JP2013081679A (en) 2011-10-12 2013-05-09 Sony Corp Biosignal processing device, electroencephalograph and biosignal processing method
JP2014036862A (en) * 2012-08-17 2014-02-27 Nielsen Co (Us) Llc System and method for collecting and analyzing brain wave data

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006006665A (en) 2004-06-25 2006-01-12 Nou Kinou Kenkyusho:Kk Brain function analyzing system
JP2006014833A (en) 2004-06-30 2006-01-19 Olympus Corp Brain function determination system
US20090259137A1 (en) 2007-11-14 2009-10-15 Emotiv Systems Pty Ltd Determination of biosensor contact quality
JP4778595B2 (en) * 2009-12-15 2011-09-21 パナソニック株式会社 Electrode wearing state judging system, electrode wearing state judging method and program thereof
JP4921621B2 (en) 2010-06-14 2012-04-25 パナソニック株式会社 EEG measurement system, EEG measurement method and program thereof
JP2013081679A (en) 2011-10-12 2013-05-09 Sony Corp Biosignal processing device, electroencephalograph and biosignal processing method
JP2014036862A (en) * 2012-08-17 2014-02-27 Nielsen Co (Us) Llc System and method for collecting and analyzing brain wave data

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