JPH04303415A - Electrode for living body - Google Patents

Abstract

PURPOSE:To facilitate surely the attachment of an electrode to a body to be inspected, obviate an odd feeling given by the attachment for a long time and further prevent the occurrence of noises caused by the external force. CONSTITUTION:An electrode element 10 is held by a planar non-expansible member 11 supported by an elastic base material 12. The electrode element 10 is formed in the central portion of the upper surface with a groove 18 to which a core wire 14a of a lead wire 14 is fixedly supersonic welded, so that the surface of the electrode element 10 is flattened. The intermediate portion 4b of the lead wire 4 is fixed by a planar member 14 which is formed on the upper surface with an attaching position indicating section 24 by characters, patterns, etc. The base material of the electrode element 10 is formed of conductive resin and on the lower surface side with a silver/silver chloride layer 19. While the electrode element 10 is received in an opening 12a of the elastic base material 12, a conductive gel layer 13 is formed to form the flat lower surface.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biological electrode for drawing a weak current from a subject, and more particularly to a disposable biological electrode for use in electrocardiogram recording.

0002

[Prior Art] Among biometric measurements, electrocardiography is a common test, and in recent years, it has been used not only in school child examinations, medical checkups, and adult disease examinations, but also in hospitals.
General wards, intensive care units (ICU), coronary intensive care units (
CCU), etc., are widely used.

[0003] Indispensable for this electrocardiogram test are electrocardiogram measurement electrodes for collecting electrocardiogram signals weaker than those of a living body. There are two types of electrodes. That is, there are two types: a type that can be reused many times, and a disposable type that can be used only once. This disposable type is often used when performing electrocardiogram tests over a relatively long period of time, such as electrocardiogram monitoring tests or long-term electrocardiogram tests in intensive care units, coronary artery intensive care units, etc. Therefore, it is basically required to be stable for a long time and to not feel uncomfortable when worn. In particular, these two conditions are extremely important in long-term electrocardiogram tests because the test is performed while carrying out daily life with electrocardiogram electrodes attached.

[0004] Current disposable electrodes for long-term electrocardiogram tests do not have lead wires integrated as shown in FIGS. 11 and 12, for example, and after the lead wires are attached to the electrodes, (Utility Model Application Publication No. 63-114605). Moreover, the material of this electrode has a structure in which a stretchable base material 101 is directly fitted to the electrode element 100, taking into consideration the feeling of wearing. Electrode element 10
The base material of No. 0 is made of synthetic resin, and the entire resin is covered with a silver/silver chloride layer 102, thereby electrically connecting the electrode surface 104 and the lead wire connection portion 103.

[0005]

[Problems to be Solved by the Invention] As mentioned above, in conventional electrodes for long-term electrocardiogram recording, the electrode and lead wire are not integrated, and there is a protrusion for connecting the lead wire after it is attached to the electrode. (lead wire connection part 103), and this protrusion caused discomfort when worn for a long time.

[0006] Furthermore, the connection between the lead wire and the protrusion is as follows:
This is done with a metal snap, magnet, clip, etc. Therefore, if an external force is applied to this connection during long-term electrocardiogram recording, noise may be added to the electrocardiogram signal.
The lead wire may come off. Furthermore, in electrocardiogram recording, multiple electrodes are usually attached to the living body.
At this time, if the connection between each attached electrode and the electrocardiograph signal input section is incorrect, an electrocardiogram necessary for diagnosis may not be obtained.

[0007] Furthermore, in the conventional electrode for long-term electrocardiogram recording, the electrode element 100 is directly fitted into the elastic base material 101. Therefore, although it feels good when worn, when an external force is applied to the electrode element 100, the electrode element easily oscillates, which also causes noise to be added to the electrocardiogram signal.

The present invention has been made in view of the above problems, and its purpose is to make it easy and reliable to attach it to a subject, to make it comfortable to wear it for a long time, and to prevent noises caused by external forces. The purpose of the present invention is to provide a biological electrode that is free from these problems.

[0009]

[Means for Solving the Problems] The biological electrode of the present invention includes:
an electrode element having a first surface on the side where the subject is attached and a second surface opposite to the surface; and an electrode element formed of a material that does not substantially expand or contract, and having a through hole penetrating through both surfaces; a non-stretchable member that holds the electrode element at the part and forms a substantially flat surface on the second surface side together with the electrode element, and a core wire part is fixed to an area of the electrode element other than the second surface. an elastic base having an opening capable of accommodating the electrode element, accommodating a portion including at least the first surface of the electrode element within the opening, and supporting the non-stretchable member. a mounting portion provided on the first surface side of the elastic base material, the mounting portion covering at least the first surface of the electrode element and forming a substantially flat surface with the mounting portion. The elastic member includes a conductive material layer formed in the opening of the elastic member, and a flat member that fixes the intermediate portion of the lead wire to the non-stretchable member.

[0010] In this specification, the "second surface" refers to
When the electrode of the present invention is attached to a subject, it refers to a region that substantially forms the back surface of the electrode element, and does not include internal regions such as grooves formed in that region.

[0011] In the biological electrode of the present invention, the core wire portion of the lead wire is fixed in advance to an area other than the back surface (second surface) of the electrode element, so that the back surface is substantially flattened. be able to. That is, since there is no protrusion on the back surface of the electrode element, there is no discomfort even when the subject wears it for a long time. In addition, since the electrode element is supported by a non-stretchable member that does not substantially stretch, even when an external force is applied, the positional relationship between the surface of the subject and the surface of the electrode element can be maintained, and the external force is It is absorbed by the elastic base material through this non-stretchable member. Therefore, it is possible to prevent the generation of noise, and it is stable for a long time.
Weak signals such as electrocardiograms can be obtained. Furthermore, if the attachment part is made of an adhesive layer, it can be attached to the subject by simply pasting it, eliminating the need for troublesome work such as connecting lead wires, and making it possible to perform measurement work quickly.

Further, in the biological electrode of the present invention, the electrode element is formed of a conductive resin, and the lead wire is formed in a region other than the second surface corresponding to the through hole of the non-stretchable member. A groove for fixing the core wire portion is formed, and only the first surface is coated with a silver/silver chloride layer, and the core wire portion of the lead wire fixed in the groove portion and the silver/silver chloride layer are coated with the conductive resin. It is configured so that it is electrically connected via.

[0013] This electrode element is formed of a non-conductive resin, and has a groove portion for fixing the core wire portion of the lead wire formed on the second surface side in correspondence with the through hole of the non-stretchable member; Only the first surface is covered with a silver/silver chloride layer, and the core wire portion of the lead wire fixed in the groove portion and the silver/silver chloride layer are electrically connected via a conductive member. Alternatively, this electrode element may be formed of a non-conductive resin, and a groove portion for fixing the core wire portion of the lead wire may be formed on the second surface side in correspondence with the through hole of the non-stretchable member. At the same time, the first surface is covered with a silver/silver chloride layer from the first surface to the groove so that the core wire portion of the lead wire fixed to the groove is directly electrically connected to the silver/silver chloride layer. may be configured.

In the biological electrode of the present invention, the silver/silver chloride layer is formed only in a partial region of the electrode element. Therefore, the amount of silver/silver chloride used can be saved. Also,
Handling of the electrode element after forming the silver/silver chloride layer becomes easier, and there is no fear that the silver/silver chloride layer will peel off during assembly of the electrode component, making it possible to prevent the occurrence of defective products.

Further, the biological electrode of the present invention further includes a single connector that is connectable to a measuring device and integrally includes a plurality of signal terminals, and also includes a plurality of the electrode elements,
The other end of each of the plurality of lead wires connected to these electrode elements is configured to be fixed and electrically connected to the signal terminal.

[0016] With this configuration, the trouble of individually connecting multiple lead wires to the electrode elements and the electrocardiograph, etc., is eliminated, and there is no risk of incorrect wiring.Moreover, the connection operation can be done only once, so the connection is easy. It becomes easy and reliable.

Furthermore, the biological electrode of the present invention has a mounting position display section on the surface of the flat member for displaying the mounting position on the subject, thereby facilitating and facilitating the mounting work on the subject. It can be done quickly.

[0018]

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

FIG. 1 shows the overall configuration of an embodiment of the present invention in which a biological electrode is used as an electrocardiogram recording electrode. This electrocardiogram recording electrode is composed of a plurality of electrode main bodies 1 to 3, a plurality of lead wires 4 to 6 corresponding to these electrode main bodies 1 to 3, and a single connector 7.

[0020] The electrode main bodies 1 to 3 are each attached to each part of a living body according to a predetermined guidance method, and are configured to collect electrocardiogram signals. One end of the lead wires 4 to 6 is connected to each of the electrode main bodies 1 to 3, respectively.

FIGS. 3 to 5 show the electrode body 1 as an example in order to explain the structure of each of the electrode bodies 1 to 3. The electrode main body part 1 includes an electrode element 10 for deriving a biological weak current from the biological skin surface, and this electrode element 1.
0 and this non-stretchable member 1
1, a conductive gel layer 13 as a conductive material layer interposed between the electrode element 10 and the biological surface, and a flat plate-shaped member 1 that covers the surface of the electrode element 10.
4 and a lead wire 4 whose core wire portion 4a is fixed to the electrode element 10, both surfaces of which are substantially flat.

On the upper surface side of the electrode element 10, as shown in FIG. 4, several engaging portions 15 are provided in advance in a circumferential manner.
The upper portions of these engaging portions 15 are each bent horizontally toward the outside of the circumference to form a flat surface 16. A groove portion 18 is formed between these engaging portions 15, and a core wire portion 14a of the lead wire 14 is inserted into this groove portion 18 from between the engaging portions 15.
is inserted, fixed and electrically connected. That is, the lead wire 4 has a structure in which the core wire portion 4a is fixed not to the surface of the electrode element 10 but to the inside thereof.

The base material of the electrode element 10 is made of a conductive resin, for example, an ABS resin containing carbon powder. The surface of this electrode element 10 on the biological side (lower surface in the figure)
is covered by a silver/silver chloride layer 19. The silver/silver chloride layer 19 stably guides a minute current introduced from the biological surface through the conductive gel layer 13 to the base material (conductive resin) of the electrode element 10, and is formed by, for example, a sputtering method. Ru. Note that this silver/silver chloride layer 19 may have a two-layer structure of a silver layer and a silver chloride layer, or may have a one-layer structure by mixing powders of silver and silver chloride, or may have a structure made of powder such as an amorphous alloy. may be mixed.

The non-stretchable member 11 is made of a substantially non-stretchable material, such as a resin such as polyester, polyethylene, polypropylene, vinyl chloride, acrylic resin, or polyacetal resin. This non-stretchable member 1
A circular through hole 17 that penetrates both sides is formed in the center of the through hole 1, and a plurality of notches 1 are formed at the periphery of the through hole 17.
7a and a plurality of collar parts 17 between these notches 17a.
b are formed respectively. The collar portion 17b of the non-stretchable member 11 engages with the engaging portion 15 of the electrode element 10, thereby holding the electrode element 10. In addition, since the electrode element 10 and the non-stretchable member 11 having such a structure are each made of resin, they can be easily molded by molding.
And it can be molded in large quantities.

[0025] The elastic base material 12 covers at least the electrode element 10.
The opening 12a, which is larger than the electrode element 10, is formed in the center thereof. A non-stretchable member 11 is adhered to the upper surface of this elastic base material 12, and approximately half of the electrode element 10 is placed in the silver/silver chloride layer 19 within the opening 12a.
It is housed with its side facing down. The elastic base material 12 is made of a foamed resin such as polyethylene foam, and a mounting portion 20 made of a low biological irritation adhesive is provided on the lower surface thereof. Conductive gel layer 13
is formed of, for example, a hydrous gel of polyvinylpyrrolidone/isobutylene maleic anhydride copolymer, is filled into the opening 12a of the elastic base material 12, covers the silver/silver chloride layer 19 of the electrode element 10, and It forms a substantially flat surface with the adhesive layer 20.

The flat member 14 is made of, for example, a non-woven fabric and is bonded and fixed onto the non-stretchable member 11 and the elastic base material 12 so as to sandwich the middle portion 4b of the lead wire 4 therebetween. . On the upper surface of this flat member 14, as shown in FIG. 1, an adhesion position display section 24 is formed using characters, figures, etc.

In the electrocardiogram recording electrode of this embodiment, the core wire portion 4a of the lead wire 4 is fixed in a groove portion 18 formed in advance on the upper surface of the electrode element 10, and the lead wire 4 is led out from this portion. . Therefore, there is no need to form a protrusion for connecting lead wires as in the conventional case. Therefore, as shown in FIG. 3, the flat surface 16 of the electrode element 10 and the intermediate portion 4b of the lead wire 4 are substantially on the same plane, and the electrode surface can be made substantially flat. That is, since there are no protrusions on the surface of the electrode element 10, there is no discomfort even when the subject wears this electrode for a long time. Furthermore, since the electrode element 10 is held by the non-stretchable member 11, even when an external force is applied, the positional relationship between the surface of the living body and the surface of the electrode element 10 can be maintained, and this external force is It is absorbed by the elastic base material 12 that supports the non-stretchable member 11. Therefore, generation of noise can be prevented, and biological signals such as electrocardiograms can be stably obtained over a long period of time. Furthermore, the device can be attached to the subject by simply pasting it using the attachment section 20, and the troublesome work of connecting lead wires is unnecessary, so that the measurement work can be performed quickly.

In addition, in this electrocardiogram recording electrode, the portion where the silver/silver chloride layer 19 is formed is formed only on the lower surface of the electrode element 10, which saves the amount of silver/silver chloride used compared to conventional electrodes. can do. In addition, silver/silver chloride layer 19
In the electrode component assembly process after forming the electrode element 1
The silver/silver chloride layer 19 can be easily handled, and there is no fear that the silver/silver chloride layer 19 will peel off. Therefore, generation of defective products can be prevented.

Furthermore, in this electrocardiogram recording electrode, since a mounting position display section 24 is formed on the surface of the flat plate member 14 to display the mounting position on the living body, the work of pasting it on the living body can be done easily and quickly. It can be carried out.

Next, a method for assembling the electrode main body 1 is shown in FIG.
This will be explained with reference to FIG.

First, while holding the non-stretchable member 11, the engaging portion 15 of the electrode element 10 is inserted into the notch 1 of the through hole 17.
7a, and then either the electrode element 10 or the non-stretchable member 11 is slightly rotated. As a result, the engaging portion 15 of the electrode element 10 and the collar portion 17b of the non-stretchable member 11 are engaged, and the non-stretchable member 11 is attached to the electrode element 10.
is maintained. Next, the covering of the lead wire 4 is peeled off to expose the core wire portion 4a, and the core wire portion 4a is inserted into the groove portion 18 of the electrode element 10 through the through hole 17 of the non-stretchable member 11. After the core wire portion 4a of the lead wire 4 is inserted into the groove portion 18, heat or ultrasonic waves are applied partially around the groove portion 18 to weld the conductive resin so as to hold the lead wire 4. As a result, the core wire portion 4a of the lead wire 4 is connected to the electrode element 10.
It is fixed in the groove 18 of and electrically connected to it.

In this method, the groove 18 for fixing the lead wire
is formed on the top surface of the electrode element 10 and is open upward, making it easy to insert and fix the lead wire 18.
It can be fixed securely. Furthermore, as shown in FIG. 5, the lead wire 4 can be fixed without impairing the flatness of the surface of the electrode element 10. Furthermore, if heat or ultrasonic waves are applied to the flat part 16 of the engaging part 15,
This portion is also welded, and as a result, the electrode element 10 is strongly held to the non-stretchable member 11.

After the basic parts of the electrode main body 1 have been created in this way, the elastic base material 12 is fixed to this basic part. That is, the upper surface of the elastic base material 12 is
The electrode element 10 is bonded to the lower surface thereof so that the silver/silver chloride layer 19 of the electrode element 10 is exposed toward the opening 12a. Subsequently, the flat member 14 is bonded, and the intermediate portion 4b of the lead wire 4 is held and fixed between the flat member 14, the non-stretchable member 11, and the elastic base material 12. In addition, the elastic base material 12
A liquid gel base material is filled into the opening and heated and hardened to form a gel layer 13. Note that this gel layer 13 may be formed by punching and fitting a processed gel into the shape of the opening 12a of the elastic base material 12.

[0034] The electrode main body portion 1 can be produced through the steps described above. Next, the connector 7 shown in FIG.
The structure of the section will be explained.

The connector 7 has a plurality of signal output terminals 25 to 25 electrically connected to the other end of each of the lead wires 4 to 6.
27, which can be connected to an electrocardiograph constituting the measuring device, and electrocardiogram signals are transmitted to the electrocardiograph via this connector 7.

As shown in FIGS. 9 and 10, the connector 7 has a flat substrate 28 made of paper phenolic resin, for example.
Patterns of signal output terminal portions 25 to 27 are formed on the top. The flat substrate 28 may be a glass epoxy substrate, or may be a flexible substrate made of resin such as polyester or polyimide with a reinforcing plate attached to the other surface. The connection portions of the signal output terminals 25 to 27 with the lead wires 4 to 6 are covered with an insulating protective layer 29 formed of, for example, a heat-shrinkable film.

[0037] According to such a configuration, it is easy to mass-produce the connector 7, the manufacturing cost thereof is reduced, and the entire electrode can be made of a disposable type. In addition, since the trouble of individually connecting the plurality of lead wires 4 to 6 to the electrode bodies 1 to 3 and the electrocardiograph etc. is eliminated, there is no risk of incorrect wiring, and the connection operation only needs to be done once. Connection work becomes easy and reliable.

FIGS. 6 and 7 show a method of assembling the electrode main body 1 according to another embodiment of the present invention. In this embodiment, a semi-cylindrical projection 21 is formed on the upper surface of the electrode element 10.
, 21b are formed to face each other. A groove 30 is formed on the surface of the electrode element 10 between the protrusion 21a and the protrusion 21b, and the core wire portion 4a of the lead wire 4 is fixed to this groove 30. One protrusion 21b has a height lower than the other protrusion 21a, and the non-stretchable member 11
The thickness is approximately the same as that of .

In this embodiment, the electrode element 10 is made of a non-conductive resin, and the groove 30 is formed by the silver/silver chloride layer 1.
9 and electrically conductive via the conductive member 22. As the conductive member 22, a stainless steel member is used, for example, and is inserted and integrated so as to communicate with the surface of the electrode element 10 and the groove portion 30 during or after injection molding of the electrode element base material.

On the other hand, a circular hole 23 is formed in the center of the non-stretchable member 11, through which the projections 21a, 21b of the electrode element 10 can be inserted.

In this embodiment, first, the protrusion 2 of the electrode element 10 is
1 a is inserted into the through hole 23 of the non-contact member 11 to protrude from the surface of the non-contact member 11 , and then the core wire portion 4 a of the lead wire 4 is inserted into the groove portion 30 . Subsequently, the protrusions 21a, 2
Heat or ultrasonic waves are applied to the periphery of 1b to weld it. As a result, the protruding portion of the protrusion 21a is flattened as shown in FIG. becomes.

In this method, the core wire portion 4a of the lead wire 4 is fixed to the groove portion 30 of the electrode element 10, and the electrode element 10 is fixed to the groove portion 30 of the electrode element 10.
can be fixed to the non-stretchable member 11 in one operation, and the surface of the electrode element 10 can be flattened, so the process can be simplified. Note that the other configurations and effects are the same as those of the embodiment shown in FIGS. 3 to 5, so their explanation will be omitted.

The present invention has been explained above with reference to examples, but
The present invention is not limited to the above embodiments, and can be modified in various ways without changing the gist thereof. For example, in the above two embodiments, the electrical connection between the core wire portion 4a of the lead wire 4 inserted into the groove portions 18 and 30 and the silver/silver chloride layer 19 is made via the conductive resin or the conductive member 22. However, as shown in FIG. 8, the silver/silver chloride layer 19 may be extended to the groove portion 18, thereby electrically connecting the electrode element 10 and the core wire portion 4a of the lead wire 4.

Further, in the present invention, the engaging portion 15 and the protrusion 21
, and the grooves 18, 30 may have shapes other than those shown in FIGS. 3 to 8. Further, in the above embodiments, the present invention has been explained as a biological electrode for recording electrocardiograms, but it can also be applied to biological electrodes used for various other biological examinations.

[0045]

As explained above, according to the biological electrode according to claim 1, since the core wire portion of the lead wire is fixed in advance to the area other than the second surface of the electrode element, the electrode element Moreover, the entire surface of the electrode can be made substantially flat, so that the subject will not feel uncomfortable even when wearing the electrode for a long time. In addition, since the electrode element is supported by a non-stretchable member that does not substantially stretch, even when an external force is applied, the positional relationship between the surface of the subject and the surface of the electrode element can be maintained, and the external force Since the noise is absorbed by the elastic member supporting the non-stretchable member, it is possible to prevent the generation of noise, and it is possible to stably obtain biological signals such as an electrocardiogram over a long period of time. Furthermore, if the attachment part is made of an adhesive layer, it can be attached to the subject by simply pasting it, eliminating the need for troublesome work such as connecting lead wires, and making it possible to perform measurement work quickly.

Further, according to the biological electrode according to claims 2 to 4, since the silver/silver chloride layer is formed only in a part of the electrode element, the amount of silver/silver chloride used is small. Therefore, costs can be reduced. In addition, handling of the electrode element in the electrode component assembly process after forming the silver/silver chloride layer is facilitated, there is no fear that the silver/silver chloride layer will peel off, and the occurrence of defective products can be prevented.

Furthermore, according to the biological electrode according to claim 5, the other ends of the plurality of lead wires are gathered together and electrically connected to each signal output terminal section provided in a single connector so that they cannot be separated in advance. This eliminates the need to individually connect multiple lead wires to electrodes and electrocardiographs, etc., and there is no risk of incorrect wiring.Furthermore, only one connection operation is required, making connections easy and convenient. Become certain.

[0048] Furthermore, according to the biological electrode according to the sixth aspect, since the mounting position display section is provided on the surface, the mounting operation on the subject can be performed easily and quickly.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the overall configuration of an electrocardiogram recording electrode according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the configuration of an electrode main body in the electrocardiogram recording electrode of FIG. 1;

FIG. 3 is a longitudinal cross-sectional view taken along line BB in FIG. 2;

FIG. 4 is an exploded perspective view for explaining the assembly process of the electrode main body shown in FIG. 3;

FIG. 5 is a longitudinal cross-sectional view showing a connection state between an electrode element and a lead wire in the assembly process of FIG. 4;

FIG. 6 is an exploded perspective view for explaining an assembly process of an electrode main body according to another embodiment of the present invention.

7 is a longitudinal cross-sectional view showing a connection state between an electrode element and a lead wire in the assembly process of FIG. 6; FIG.

8 is a longitudinal sectional view showing a modification of the embodiment of FIGS. 6 and 7. FIG.

9 is a plan view showing the configuration of a connector portion in the electrocardiogram recording electrode of FIG. 1. FIG.

10 is a longitudinal sectional view taken along line CC in FIG. 9. FIG.

FIG. 11 is a perspective view showing the configuration of a conventional biological electrode.

FIG. 12 is a cross-sectional view taken along line AA in FIG. 11.

[Explanation of symbols]

1 to 3 Electrode body parts 4 to 6 Lead wire 7 Connector 11 Non-stretchable member 12 Elastic base material 13 Conductive material layer (conductive gel layer) 14 Flat member 15 Engagement part 17 Through hole 17a Notch part 18 Groove part 19 Silver/silver chloride layer 20 Mounting layer 21, 21b Protrusion 22 Conductive member 23 Through hole 30 Groove

Claims (6)

[Claims] 1. An electrode element having a first surface on the side where the subject is attached and a second surface opposite to the surface, and an electrode element formed of a material that does not substantially expand or contract, and having a through hole penetrating through both surfaces. a non-stretchable member that holds the electrode element in the through-hole portion and forms a substantially flat surface on the second surface side together with the electrode element; a lead wire fixed to a region other than the non-stretchable member; an opening capable of accommodating the electrode element; a portion including at least the first surface of the electrode element is accommodated in the opening; and the non-stretchable member an elastic base material that supports the elastic base material, a mounting section provided on the first surface side of the elastic base material, and a substantially flat surface that covers at least the first surface of the electrode element and that is connected to the mounting section. The conductive material layer is formed in the opening of the elastic member to form a conductive material layer, and a flat plate-like member fixes the intermediate portion of the lead wire to the surface of the non-stretchable member. Biological electrode. 2. The electrode element is formed of a conductive resin, and a groove for fixing the core wire of the lead wire is formed in a region other than the second surface corresponding to the through hole of the non-stretchable member. At the same time, only the first surface is covered with a silver/silver chloride layer, and the core wire portion of the lead wire fixed in the groove portion and the silver/silver chloride layer are electrically connected via the conductive resin. The biological electrode according to claim 1, wherein the electrode is made of: 3. The electrode element is formed of a non-conductive resin, and a groove for fixing the core wire of the lead wire is formed on the second surface side corresponding to the through hole of the non-stretchable member. At the same time, only the first surface is covered with a silver/silver chloride layer, and the core wire portion of the lead wire fixed to the groove portion and the silver/silver chloride layer are electrically connected via a conductive member. The biological electrode according to claim 1. 4. The electrode element is formed of a non-conductive resin, and a groove for fixing the core wire of the lead wire is formed on the second surface side corresponding to the through hole of the non-stretchable member. and wherein the first surface is covered with a silver/silver chloride layer from the first surface to the groove, and the core wire portion of the lead wire fixed to the groove is directly electrically connected to the silver/silver chloride layer. 1. The biological electrode according to 1. 5. Further comprising a single connector connectable to a measuring instrument and integrally having a plurality of signal terminals,
Any one of claims 1 to 4, comprising a plurality of said electrode elements, the other end of each of a plurality of lead wires connected to said electrode elements being fixed and electrically connected to said signal terminal. The biological electrode described in . 6. The biological electrode according to claim 1, further comprising a mounting position display section on the surface of the flat member for displaying the mounting position on the subject.