JP5907677B2 - Bioelectrode cover and electrostatic induction noise suppression method - Google Patents

Description

The present invention relates BIOLOGICAL electrode cover及 beauty static induction noise suppression method, in particular, it relates to a technique for suppressing electrostatic induction noise in the biological signal detected by the biological electrodes positioned on the body surface of a living body.

  As a biological electrode for measuring a biological signal such as an electrocardiogram, the biological electrode is attached to the body surface of the subject at the time of measurement, the biological signal is acquired by the electrode part on the body surface, and the biological electrode is obtained via a signal transmission unit such as a cable. Those that transmit signals to various medical instruments are widely used. There are a variety of configurations of the bioelectrode, and they are usually used according to the usage situation. For example, there are an integrated bioelectrode in which an electrode part and a cable are connected, a bioelectrode for connecting a cable to the electrode part during measurement, and the like.

  When a biological signal is measured using a biological electrode, if an electrostatically charged object (for example, clothing; hereinafter referred to as “charged body”) comes close to the electrode part, electrostatic induction is generated between the charged body and the surface of the electrode part. Occasionally, an electric field may be generated to generate a voltage that becomes a noise source. At this time, electrostatic induction noise is mixed into the biological signal transmitted from the electrode portion to the instrument via the cable.

  Here, as a general static electricity removal technique, for example, those described in Patent Documents 1 to 5 are known.

  In the method described in Patent Document 1, a volatile liquid is sprayed in the form of a mist on the surface of a charged body, and the volatile liquid is volatilized to remove static electricity from the surface of the charged body.

  In the method described in Patent Document 2, static electricity is removed by generating ionized air by corona discharge and applying the ionized air to a charged body.

  In the method described in Patent Document 3, static electricity is removed by bringing a conductive static electricity removing brush into contact with a charged body.

  In the method described in Patent Document 4, static electricity is removed by spraying a static neutralizing agent onto a charged body.

  In the method described in Patent Document 5, static electricity is released to the ground through the work desk by the wrist strap.

  In any of the above methods, static electricity is removed from the charged body itself.

  On the other hand, the electrostatic induction noise suppression method that suppresses noise due to electrostatic induction with a charged body on the bioelectrode side is to cover the electrode connection part of the cable with a shield and discharge the charge on the shield surface to the instrument side ground with the cable. Therefore, it is well known in the art to suppress a voltage that becomes a noise source.

JP 2008-47336 A JP-A-55-62503 Japanese Utility Model Publication No. 55-99100 Japanese Utility Model Publication No.57-140099 JP 2004-31071 A

  In the conventional electrostatic induction noise removing method, a shielded cable is used, but it may be desirable not to use a shielded cable depending on the use situation of the bioelectrode. For example, when a surgical operation is performed while an X-ray image is taken with a biological electrode attached to the body surface and a shielded cable connected to the electrode portion, the X-ray is blocked by the shield and the shield image becomes X May appear in line images. In addition, if defibrillation is performed with a living body electrode attached to the body surface and a shielded cable connected to the electrode during surgery, depending on the positional relationship between the shield and the defibrillation electrode, these may be short-circuited. There is sex.

  For the above reasons, it is required to suppress electrostatic induction noise of a biological signal on the biological electrode side regardless of whether or not the cable connected to the electrode portion of the biological electrode is shielded.

An object of the present invention, with or without the shield in the cable to be connected to the electrode portion of the bioelectrode, a static induction noise of the biological signal can be suppressed by the biological electrode side cover及 BiShizu for BIOLOGICAL electrode An electrical induction noise suppression method is provided.

The bioelectrode cover of the present invention is
A covering material that covers an electrode portion of a biological electrode attached to a body surface of the living body;
A charging unit that is insulated from the electrode unit and is provided on the covering material, and charges a charge by electrostatic induction with a charged body adjacent to the electrode unit;
A discharge unit that discharges the charged charge of the charging unit to the living body via a connection unit that electrically connects the charging unit and the body surface;
An insulator interposed between the charging unit and the electrode unit and between the discharge unit and the electrode unit when the coating material covers the electrode unit;
I have a,
The discharge part is arranged to adhere to the charging part so as to be separated from the electrode part in the extending direction of a cable connected to the electrode part in the biological electrode,
The insulator is arranged to adhere to a remaining region of the charging unit where the discharge unit is not disposed, covers the entire surface of the electrode unit over substantially the entire surface, and separates the discharge unit from the electrode unit. It extends to the spaced apart part and adjoins the discharge part .

The electrostatic induction noise suppression method of the present invention is an electrostatic induction noise suppression method for suppressing electrostatic induction noise in a biological signal,
When a charged body comes close to an electrode portion of a biological electrode attached to the surface of a living body, a charge is charged to the charged portion that is insulated from the electrode portion via an insulator that covers the entire electrode portion. Charging step;
The insulator is adjacent in the extending direction of a cable connected to the electrode portion, and is spaced apart from the electrode portion by the insulator, and the charging portion and the body surface the via connection for electrically connecting, the step of discharging the charge of the charging unit to the living body,
Have

  ADVANTAGE OF THE INVENTION According to this invention, the electrostatic induction noise of a biosignal can be suppressed on the bioelectrode side irrespective of the presence or absence of the shield in the cable connected to the electrode part of a bioelectrode.

(A) Top view of electrode cover according to Embodiment 1 of the present invention, (b) Bottom view of the electrode cover, (c) Schematic diagram showing a laminated configuration of the electrode cover (A) The figure which shows the structural example of the conventional bioelectrode, (b) The figure which shows the electrode main body which is the principal part of the bioelectrode (A) The figure for demonstrating the usage method of the electrode cover which concerns on Embodiment 1 of this invention, (b) The figure which shows the positional relationship of the electrode cover at the time of use and the electrode main body of FIG.2 (b) (A) The figure which shows the example of the limb induction waveform measured when the electrode cover which concerns on Embodiment 1 of this invention is used, (b) The figure which shows the example of the limb induction waveform measured when the electrode cover is not used (A) Top view of a modified example of the electrode cover according to Embodiment 1 of the present invention, (b) Bottom view of the modified example, (c) Schematic diagram showing a laminated configuration of the modified example (A) Top view of a biological electrode according to Embodiment 2 of the present invention, (b) Bottom view of the biological electrode, (c) Schematic diagram showing a stacked configuration of the biological electrode

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
1A and 1B are diagrams showing a configuration of a bioelectrode cover (hereinafter simply referred to as “electrode cover”) according to Embodiment 1 of the present invention, where FIG. 1A is a top view, FIG. 1B is a bottom view, (c) is a view taken in the direction of arrows I-I in (a), and is a diagram schematically showing a laminated configuration of an electrode cover.

The electrode cover 100 shown in FIG. 1 is used with its bottom surface portion (mounting surface) 100A facing the electrode portion of the biological electrode (for example, FIG. 2) and being attached to the body surface of the subject. It is. That is, the electrode cover 100 of the present embodiment is obtained by applying the electrostatic induction noise suppression device to another piece of member (cover) that can be used by covering the biological electrode.

  As shown in FIG. 1, the electrode cover 100 includes a base material 102, a conductive film 104, a foamed insulator 106, and a conductive adhesive gel 108.

  The base material 102 as a covering material is a flexible film material (for example, 75 μm in thickness) such as PET (Polyethylene terephthalate), and forms the upper surface portion 100 </ b> B of the electrode cover 100. The base material 102 has a size (for example, a length of 75 mm and a width of 30 mm) suitable for covering one electrode part of the bioelectrode.

  The conductive film 104 as a charging unit is a thin film (for example, a thickness of 10 to 15 μm) made of a conductive material formed over the entire area of the base material 102. The conductive film 104 charges an electric charge by electrostatic induction with the charged body when an external charged body (not shown) comes close to the electrode body 152.

  The conductive film 104 can be formed at low cost by conducting conductive ink printing such as carbon ink on the bottom surface portion 100 </ b> A side of the base material 102. Further, by printing the conductive ink on the bottom surface portion 100 </ b> A side of the base material 102, the conductive ink can be prevented from being exposed. In addition, the electrode cover 100 can be formed thin by forming a charging portion or a conductive material to be stacked on the film-shaped covering material (base material 102) as a thin film like the conductive film 104.

  The conductive adhesive gel 108 as the discharge part is disposed on the bottom surface part 100A side of the conductive film 104 in the end region in the length direction of the base material 102 (about 10 mm from both ends in the length direction to the center side). It adheres to the conductive film 104 due to its adhesiveness. The surface opposite to the surface that adheres to the conductive film 104 can adhere to the body surface due to self-adhesiveness. Therefore, the conductive adhesive gel 108 can maintain a contact state with both the conductive film 104 and the body surface, thereby forming a connection portion that electrically connects the conductive film 104 and the body surface. The charged charge of the conductive film 104 is discharged into the body through the unit. Since the connection portion that contacts the body surface is formed of the conductive adhesive gel 108 containing moisture, even when the electrode cover 100 is continuously used for a long time, the skin disorder of the subject can be reduced.

  The foam insulator 106 is an insulator made of a foamable material, and is disposed in the remaining region where the conductive adhesive gel 108 is not disposed on the bottom surface portion 100A side of the conductive film 104, and an adhesive (not shown). Is attached to the conductive film 104.

  The electrode cover 100 having the above configuration is stored in a state where the entire mounting surface is covered with a protective film (not shown) when not in use, and can be used by peeling the protective film during use. The protective film is, for example, a PET film, but may be made of paper.

  The electrode cover 100 can be used for the conventional biological electrode shown in FIG. 2, for example. 2A and 2B are diagrams illustrating a configuration example of a conventional bioelectrode, in which FIG. 2A is a diagram illustrating an entire configuration, and FIG. 2B is a schematic view of a main configuration, taken along line II-II. .

  As shown in FIG. 2A, the biological electrode 150 has an integrated type configuration in which six electrode bodies 152 are connected to cables 154, respectively. At the end of the cable 154, a connector 156 that can be connected to an instrument such as a biological information recording apparatus is provided. The electrode body 152 is stored in a state where the entire bottom surface portion (mounting surface) 152A of the electrode body 152 is covered with the protective film 158 when not in use, and can be used by peeling off the protective film 158 when in use.

  As shown in FIG. 2B, the electrode main body 152, which is a main part of the biological electrode 150, has a base material 160 that is a foamed insulator that forms the upper surface portion 152B, and the bottom surface portion 152A side of the base material 160. For example, an electrode element 162 made of, for example, silver / silver chloride is attached. Further, the electrode main body 152 has a configuration in which the conductive adhesive gel 164 is attached to the entire bottom surface portion 152 </ b> A side of the base material 160 in a state where the carbon yarn 154 a forming the conductor of the cable 154 is in contact with the electrode element 162. In the electrode body 152, the combination of the electrode element 162 and the conductive adhesive gel 164 constitutes the electrode portion 152 </ b> C of the biological electrode 150.

  In FIG. 2B, the members are separated from each other for easy understanding of the laminated structure of the electrode main body 152.

  FIG. 3A is a view for explaining how to use the electrode cover 100, and FIG. 3B is a view taken along the line III-III showing the positional relationship between the electrode cover 100 and the electrode body 152 in use. is there.

  As shown in FIG. 3A, when the electrode cover 100 is used, the bottom surface portion 100A of the electrode cover 100 and the top surface portion 152B of the electrode body 152 with the bottom surface portion 152A facing the body surface (not shown). The electrode cover 100 is put on the electrode main body 152 in a state of being directed to. By covering the electrode cover 100 on the electrode main body 152 in this manner, the foamed insulator 106 can be interposed between the conductive film 104 of the electrode cover 100 and the electrode portion 152C of the electrode main body 152. Therefore, the conductive film 104 of the electrode cover 100 can be reliably insulated from the electrode portion 152C of the electrode body 152.

  When the electrode cover 100 is put on the electrode main body 152, both the conductive adhesive gels 108 are disposed so that both the conductive adhesive gels 108 located at both ends come into contact with the body surface and can reliably discharge the charged charges in the body. It is preferable not to overlap the electrode body 152.

  Further, the foamed insulator 106 extends to the separation portion G so that the conductive adhesive gel 108 and the electrode portion 152C (particularly the end face of the electrode portion 152C) are reliably separated when the electrode cover 100 is put on the electrode main body 152. It is preferable to do. Thus, when the electrode cover 100 is put on the electrode main body 152, the foamed insulator 106 can be interposed between the conductive adhesive gel 108 of the electrode cover 100 and the electrode portion 152C of the electrode main body 152. Thereby, it is possible to reliably avoid the discharge of the charged charges into the electrode portion 152C.

  When the electrode cover 100 is used as described above, when an external charged body comes close to the electrode portion 152C, electrostatic induction is generated between the charged body and the conductive film 104 to charge the conductive film 104. Can be made. Then, the charged charge can be discharged into the body of the subject through the conductive adhesive gel 108. As a result, an electrocardiogram waveform in which electrostatic induction noise is suppressed can be obtained. This effect is obtained when an example of an electrocardiogram measurement result (limb induction waveform) when the electrode cover 100 is used (FIG. 4A) is compared with that when the electrode cover 100 is not used (FIG. 4B). ,it is obvious.

  As described above, according to the present embodiment, the conductive film 104 that is insulated from the electrode portion 152C of the biological electrode 150 is charged by electrostatic induction with a charged body adjacent to the electrode portion 152C. Then, the charged electric charge is discharged into the body of the subject through the conductive adhesive gel 108 that electrically connects the conductive film 104 and the body surface of the subject. With this configuration, even if the cable 154 connected to the electrode portion 152C is not shielded, the electrostatic induction noise of the biological signal can be suppressed on the biological electrode 150 side. Needless to say, even when the cable 154 is shielded, the noise suppression effect can be increased by the configuration of the present embodiment.

  In addition, according to the present embodiment, the above-described effect is realized simply by applying the above configuration to the electrode cover 100 that is a separate piece from the biological electrode 150 and covering the biological electrode 150 with the electrode cover 100. Therefore, it is possible to easily obtain the effect of suppressing electrostatic induction noise in any existing type of biological electrode.

  In addition, it is good also as a structure which can affix the electrode cover 100 to the electrode main body 152. FIG. 5A and 5B are diagrams showing a modification of the configuration of the electrode cover 100, where FIG. 5A is a top view, FIG. 5B is a bottom view, and FIG. 5C is a view taken along the line V-V in FIG. FIG. 3 is a diagram schematically showing a laminated configuration of an electrode cover 100. In addition, the same reference number is attached | subjected to the component same as the description thing.

  In the electrode cover 100 shown in FIG. 5, an adhesive portion 110 made of an adhesive capable of adhering to the body surface of a living body is provided at the center portion of the bottom surface portion 100 </ b> A side of the foamed insulator 106. With this configuration, since the bottom surface portion 100A of the electrode cover 100 can be attached to the top surface portion 152B of the electrode body 152, the electrode cover 100 and the electrode body 152, which are originally separate, can be easily integrated. In this case, when the electrode cover 100 and the electrode main body 152 are removed from the subject after the biosignal measurement, the electrode main body 152 can be simultaneously removed from the body surface by simply removing the electrode cover 100 from the body surface.

  In the present embodiment, since the size of the electrode portion 152C is equal to the surface of the electrode main body 152 (that is, the size of the base material 160), the electrode cover 100 covers the entire electrode main body 152. However, when the electrode portion 152C occupies only a part of the surface of the electrode body 152, the electrode cover 100 may be of a size that covers the electrode portion 152C and can be electrically connected to the body surface.

(Embodiment 2)
6A and 6B are diagrams showing a configuration of a bioelectrode according to Embodiment 2 of the present invention, where FIG. 6A is a top view, FIG. 6B is a bottom view, and FIG. 6C is a cross-sectional view taken along line VI-VI in FIG. It is a figure, Comprising: It is a figure which shows schematically the laminated structure of a bioelectrode.

The bioelectrode 200 shown in FIG. 6 is used by attaching its bottom surface (mounting surface) 200A to the body surface of the subject. That is, the biological electrode 200 of the present embodiment is obtained by applying an electrostatic induction noise suppression device to the biological electrode itself.

  As shown in FIG. 6, the bioelectrode 200 includes a base material 202, an electrode element 204, conductive adhesive gels 206 and 208, and a conductive film 210.

  The base material 202 is a sheet material such as a non-woven fabric, for example, and is formed to have a circular portion (for example, a diameter of 40 mm) and an extending portion that forms a knob portion. An electrode element 204 is arranged at the center of the base material 202 so as to penetrate the base material 202 from the bottom surface portion 200A side and protrude toward the top surface portion 200B side.

  The electrode element 204 is a member formed by, for example, molding a carbon-containing resin into a mushroom shape and attaching a silver / silver chloride thin film on the mushroom-shaped head. By inserting the body portion of such a member into the center portion of the base material 202 from the bottom surface portion 200A side and projecting it toward the top surface portion 200B side, the electrode element 204 can be a hook-type electrode element.

  The conductive adhesive gel 206 is arranged in a circular shape so as to cover the head of the electrode element 204 located on the bottom surface portion 200A side of the base material 202, and adheres to the base material 202 and the electrode element 204 by its own adhesiveness. ing. The surface opposite to the surface to be bonded to the base material 202 and the electrode element 204 can be attached to the body surface by self-adhesiveness. The combination of the electrode element 204 and the conductive adhesive gel 206 constitutes the electrode part 200 </ b> C of the biological electrode 200.

  Here, for example, an acrylic non-conductive adhesive is applied to the portion (outer peripheral portion) where the electrode portion 200C is not disposed on the bottom surface portion 200A side of the base material 202, and this portion is applied to the body surface. It has an adhesive surface that can be adhered.

  In addition, a hole 202a having a diameter of 4 mm, for example, is formed on the outer periphery of the base material 202, and a conductive film 210 is disposed so as to cover the hole 202a.

  The conductive film 210 as a charging portion is a thin film (for example, 10 to 15 μm in thickness) made of a conductive material formed by a method such as conductive ink printing on the upper surface portion 200B side of the base material 202. The conductive film 210 is arranged in an annular shape around the electrode element 204, and is arranged away from the electrode element 204 so as to be electrically insulated from the electrode part 200 </ b> C. The conductive film 210 charges an electric charge by electrostatic induction with an external charged body (not shown) close to the electrode portion 200C.

  In order to reliably insulate the conductive film 210 and the electrode part 200C, the conductive film 210 is covered with an insulating film material, and the electrode part 200C and a connector for a cable (not shown) connected to the electrode part 200C are connected. In addition, it is preferable that the conductive film 210 is not in contact.

  The conductive adhesive gel 208 as a discharge part is filled in the hole 202a formed in the outer peripheral part of the base material 202, and adheres to the conductive film 210 by its own adhesiveness. The surface opposite to the surface that adheres to the conductive film 210 can adhere to the body surface due to self-adhesiveness. Therefore, the conductive adhesive gel 208 can maintain a contact state with both the conductive film 210 and the body surface, thereby forming a connection portion that electrically connects the conductive film 210 and the body surface. The charged charge of the conductive film 210 is discharged into the body through the unit.

  In addition, without filling the hole 202a with the conductive adhesive gel 208, the conductive film 210 and the body surface are electrically connected by inserting a partial region of the conductive film 210 into the hole 202a and directly contacting the body surface. You may make it connect. Also in this case, a connection portion that electrically connects the conductive film 210 and the body surface can be formed on the outer peripheral portion of the base material 202. Therefore, the charged charge of the conductive film 210 can be discharged into the body through the connection portion on the outer peripheral portion of the base material 202.

  When the biological electrode 200 having the above configuration is used, when an external charged body comes close to the electrode portion 200C, electrostatic induction is generated between the charged body and the conductive film 210 to charge the conductive film 210. be able to. Then, the charged charges can be discharged into the body of the subject through the connection portion between the conductive film 210 and the body surface.

  Therefore, according to the present embodiment, the effect of suppressing the electrostatic induction noise of the biological signal can be realized by the biological electrode 200 alone, regardless of whether the cable connected to the electrode part 200C is shielded.

  Although the embodiment of the present invention has been described above, the above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. Therefore, the above embodiment, in particular, the shape, material, size, and the like of each member of the bioelectrode can be implemented with various changes.

DESCRIPTION OF SYMBOLS 100 Electrode cover 100A, 152A, 200A Bottom surface part 100B, 152B, 200B Upper surface part 102, 160, 202 Base material 104, 210 Conductive film 106 Foam insulator 108, 164, 206, 208 Conductive adhesive gel 110 Adhesive part 150, 200 Living body Electrode 152 Electrode body 152C, 200C Electrode part 154 Cable 154a Carbon thread 156 Connector 158 Protective film 162, 204 Electrode element 202a Hole part

Claims (7)

A covering material that covers an electrode portion of a biological electrode attached to a body surface of the living body;
A charging unit that is insulated from the electrode unit and is provided on the covering material, and charges a charge by electrostatic induction with a charged body adjacent to the electrode unit;
A discharge unit that discharges the charged charge of the charging unit to the living body via a connection unit that electrically connects the charging unit and the body surface;
An insulator interposed between the charging unit and the electrode unit and between the discharge unit and the electrode unit when the coating material covers the electrode unit;
Have
The discharge part is arranged to adhere to the charging part so as to be separated from the electrode part in the extending direction of a cable connected to the electrode part in the biological electrode,
The insulator is arranged to adhere to a remaining region of the charging unit where the discharge unit is not disposed, covers the entire surface of the electrode unit over substantially the entire surface, and separates the discharge unit from the electrode unit. Extending to the spaced apart part and adjacent to the discharge part,
Cover for bioelectrode. The charging unit is a conductive film.
The bioelectrode cover according to claim 1. The conductive film is a conductive ink formed on the covering material,
The bioelectrode cover according to claim 2. The discharge part is a conductive gel that contacts both the charging part and the body surface to form the connection part.
The bioelectrode cover according to any one of claims 1 to 3. The discharge unit includes a conductive gel that contacts both the charging unit and the body surface via the cable.
The bioelectrode cover according to any one of claims 1 to 4. It further has an adhesive part for attaching the covering material to the bioelectrode,
The bioelectrode cover according to any one of claims 1 to 5. An electrostatic induction noise suppression method for suppressing electrostatic induction noise in a biological signal,
When a charged body comes close to an electrode portion of a biological electrode attached to the surface of a living body, a charge is charged to the charged portion that is insulated from the electrode portion via an insulator that covers the entire electrode portion. Charging step;
The insulator is adjacent in the extending direction of a cable connected to the electrode portion, and is spaced apart from the electrode portion by the insulator, and the charging portion and the body surface Discharging the charged charge of the charging unit to the living body through a connection unit for electrically connecting
A method for suppressing electrostatic induction noise.

Images