JPS58149734A - Conductive resin electrode for living body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conductive resin electrode for biological use that is attached to the epidermis of a living body and extracts electrical phenomena in the living body when measuring electrocardiograms.

Biomedical electrodes are attached to the epidermis of a living body via an electrolyte, electrically connected to medical equipment such as electrocardiographs and electroencephalogram needles, and used to extract good biopotentials.

Conventionally, conductive materials such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, ABC, nylon, or polyester are used as base materials, and conductive materials such as carbon graphite and silver powder, which have four electrical properties, are added as fillers. BACKGROUND ART Biomedical electrodes formed by molding are known. It is said that such a conductive resin electrode can provide an electrode that is inexpensive, lightweight, and excellent in mass production! However, on the other hand, it has the following drawbacks.

In other words, when stress such as friction or pressure is applied to the surface of a conductive resin electrode, the conductive structure of the conductive filler is destroyed, resulting in a high resistance with unstable resistance value.9. There is. In addition, since a large metal clamping piece connected to the tip of the connector is clamped to the lead wire connection protrusion provided on the electrical connection line electrode body between the iron electrode and the medical device, coughing current is generated. The connection between the nine lead wire connection protrusions provided on the gutter body and the large metal clamping piece provided on the connector causes friction with the movement of the wire, and the electrical conductivity of the lead** lead wire protrusion is easily destroyed, resulting in a conductive image. Then, W! It has been difficult to extract accurate biological signals such as the cause of connection failure or the generation of noise.The present invention has been made as a result of studies to eliminate such shortcomings. Composed of writ,
By applying a conductive paint containing at least lead Im connection protrusion VC copper powder, carbon powder, and synthetic resin as main components of this electrode, the mechanical strength of the lead m connection protrusion of the galvanized gutter body can be improved. In particular, the abrasion resistance is improved, and the lead can be attached to the epidermis of a moving body for a long time to detect the potential.
The change in contact resistance (hereinafter referred to as resistance drift) of the iI connection protrusion is extremely small, and the present invention has been completed by discovering that the electrode is an electrode for biological use that can maintain stable conductivity. reached.

Note that the resistance drift as used in the present invention refers to the lead 5taIIt5I! of the gutter body. Apply friction *1 to the starting part by reciprocating movement at a rotation angle of approximately s#oto with a metal clamping piece held by the protrusion, and measure the maximum resistance value and the small resistance value of the connection between the electrode body and the lead in each reciprocating movement. This is the difference.

An embodiment of the present invention will be described below with reference to the drawings.

Figures 1 and 3 show # of the biological conductive resin electrode of the present invention.
In the # side view, the conductive paint is applied only to the first joint connection protrusion part, and the third view shows the conductive paint applied to the entire electrode body.

In these figures, l is an electrode body. xti body l has an annular 5 edge 11 in the biological epidermis attachment image, and this edge ll
On the inside of the tube, a flattened #71 portion 12 is formed to allow the insertion of an electrolyte-impregnated sponge (not shown). 13 is lead iI! forming a connecting protrusion, 1i42
Clamp it with conductive clamping pieces 2 as shown in the figure, and
Connected to the 9-lead M3 for electrical connection to external electrocardiographs! I have to. 4 is a lead + 5ina. Conductive l is applied only to the protrusion 13 or to the entire mineral and electrical gutter body l.
This is the koji layer formed by the II family.

For example, the material of the Denitai l is made by mixing 6 to 6 ON carbon or graphite to a base material of 94X to 40X ABS, and kneading it with a mixer or roll so as not to break or break the carboy struct chair. It is heated and molded. In this 1liL polar body, if the balance of the carphone is less than 6X, the resistance on the surface of the electrode portion becomes 1X10'Ω, which is an obstacle to extraction of the weak biological position, which is not preferable. If fc6ON'fr is exceeded, the resulting molded product will have very strong wrinkles and will disappear once every 9 uses. In addition, in the case of injection molding, molding is difficult and undesirable, so A
A material with a mixing ratio of 90 to 20% of BS base material and 10 to 20% of carbon or graphite can be easily injection molded, and the conductivity of the electrode portion in this case is also good at 5000 or less. Moreover, the breaking strength f is 1/- or more, and it has favorable characteristics such as being able to withstand the strength as a biological electrode. Registered AB8
Base material 88-82%, carbon graphite 12-1
A mixing ratio of 8% is most preferred.

In addition, the injection temperature IIL of the mixture of the base material and filler at this time
Although it varies depending on the material of the Fi base material, for example, when the base material is Mu B8, it is preferable to do it in the range of 160 ° C to 300 ° C. If the injection temperature wrinkle is less than 160 ° C, the resin will not flow easily and the rounding moldability will be poor. If the temperature exceeds 300° C., the resin will thermally decompose, which is not preferable.

Although the resin base material t-AH8 of the electrode body 1 has been described above, it is not limited thereto, and other resins such as vinyl chloride resin, polycarbonate), synthetic resins such as 1111°A8 inversion, butadiene rubber, chloroprene rubber, etc. Synthetic rubber or natural rubber can be used like AH8pj.

The conductive paint that can be used to form the electrode body 4 contains silver powder, carbon powder, and synthetic resin as essential components.
By forming a coating film on at least the leads 13, there is an effect of reducing the abrasion of the protrusions and suppressing the resistance drift.

fllk, which is one of the essential components of the conductive Iji family.
＠ can use known conductive fillers, spherical,
It may have any shape such as flake, resin, needle, or chain shape. Regarding particle size, 01 to 40 μm,
Preferably, 1 to 10 μm can be used.

Further, there is no particular limit to the carbon powder, which is another essential component, and those known as conductive fillers can be used. Furthermore, other synthetic resins that are essential components include polystyrene resin, methacrylic resin, vinyl chloride resin, and polyamide 11111. ABC@11, polycarbonate resin, epoxy ewiir, phenolic resin, polyester resin, etc. 69. Preferably polystyrene resin, methacrylic resin, vinyl chloride resin, AB8 resin, polycarbonate resin, etc. 69 Particularly preferable are methacrylic resin, AB8
It is made of resin tatami.

The concentration ranges of silver powder, carbon powder, and synthetic resin can components in the conductive paint will be explained with reference to FIGS. 4 to 6.

Figures 4 to 6 are triangular Wt diagrams with synthetic resin, silver powder, and carbon powder as the three vertices. 69 In Figure 4, the nine areas indicated by A to E are the synthetic resin in the conductive paint that can be used in the present invention, It is a three-component Ill@@I consisting of silver powder and carbon powder, and conductive resin containing 5% to 25% by weight of synthetic resin, 9990% to 60% by weight, and 5% to 15% by weight of carbon powder. Paint, B is synthetic wood @ 15 weight x ~ 25 weight %,
Silver powder 70 weight x ~ 50 weight %, carbon powder 15 weight x ~
Conductive paint containing 25% by weight, C is synthetic resin 15% by weight
-425 weight
Conductive paint containing 20% to 25% by weight of carbon powder 52.5% by weight X to 55% by weight, E is synthetic resin 275% to 4% by weight
2.5% by weight, 175% by weight of silver powder to 2.5% by weight, and 55% to 70% by weight of carbon powder.

The nine areas indicated by F-I in Figure 5 are the same concentration range as in Figure 4 of the conductive paint that can be preferably used in the present invention, F is 175% to 375% by weight of synthetic resin, and 575% by weight of silver powder. % to 30% by weight, conductive paint containing carbon powder 25% to 32.5% by weight, G is synthetic resin 225% to 37% by weight
．． 5% by weight, conductive paint containing 45% to 20% by weight of silver powder, 32.5% to 425% by weight of carbon powder, H is synthetic resin 275% to 37.5% by weight, 30% to 2% by weight of silver powder .5% by weight, conductive paint containing carbon powder 42-5% by weight x ~ 60% by weight, ■ is synthetic resin 27.5% by weight ~
37.5% by weight, silver powder 125% by weight - 2. ．． 5% by weight,
It is a conductive paint containing 60% to 70% by weight of carbon powder.

In addition, the region indicated by J% in FIG. 6 is the same concentration range as in FIG. 4 of the conductive paint most preferably usable in the present invention, where J is 27.5% by weight of synthetic resin to 32% by weight. 5% by weight, silver powder 251JLX-7, 5% by weight, carbon powder 4
Conductive paint containing 7.5 weight X to 60 weight IN, K is synthetic resin 275 weight% to 325 weight%, silver powder 12-5 weight
It is a conductive paint containing ~7.5% by weight and 60% to 65% by weight of carbon powder.

Further, Table 9-1 to Table 1 below show examples of the present invention and examples of exclusion of the present invention.

−ゝ.

The following margin table 1 ■ The following margin table - ■ The following margin table - The following margin table - Otori table - ■ Table - ■ Among the conductive paints described in ff-I to ■ above, for example, test N
Na104IIi acrylic resin (combination of 6 parts of methyl methacrylate and 4 parts of n-butyl methacrylate) 1
Tree WIII with 0g and 15 parts of toluene! Add silver powder go@ and 10 parts of carbon powder to the liquid, mix and disperse uniformly with a ball mill, and then add toluene to reduce the solid malt content to 6ONO.
4-color paint was produced.

Below, conductivity am of other samples - The material was also produced in the same manner.

The conductive paint thus obtained contains 151% by weight of carbon powder.
Molded from AB8 resin containing high conductivity 8111m'
Electrode glue-) ml Brush on the connection protrusion 1111) L, 70
Heat and dry at ℃ for 30 minutes.

The biological conductive W and a* fat electrodes obtained as described above were tested according to the test methods in (1) and (2) below.

(1) Clamp a metal clamping piece on the lead wire connection protrusion of the resistance drift electrode body, and
The clamping piece is approximately 9mm centered around the lead wire connection protrusion of the electrode body.
It reciprocates 20 times with ototm rotation angle. Measure the change in resistance between the electrode body and the opening of the clamping piece during reciprocation, and define the difference between the maximum resistance value and the minimum resistance value as resistance drift (2).
Less than ◎, 2 to 5Ω are indicated as ◯, b-10Ω are indicated as ■, and those exceeding 10Ω are indicated as ×.

(2) Before wear resistance (1) In the resistance drift test, the clamping piece was repeatedly moved back and forth in a trench where the resistance drift was 10Ω, and the number of back and forth movements was considered wear resistance.
, 100 to 50- is OK, and less than 50 times is OK.

As is clear from the test results of the above-mentioned Cooking-I to ■, samples manufactured using conductive paints in which the acidity of each component of synthetic resin, silver powder, and carbon powder are included in the AoQ range of 1 m4 diagram.
Resin electrode percentage of 102 to 109 Similarly, samples in BC) area - Resin electrodes in 114 to 117, samples in area C -
122 to 142 resin electrodes, sample N&1 which is area D
Sample-15 with resin electrodes 49 to 151, ECI region
Resin electrodes with numbers 5 to 160 all have a resistance drift of 10
It has favorable characteristics, being small at Ω or less, and having excellent abrasion resistance withstanding reciprocating motion of 50 to IQOIgI. On the other hand, sample-1 (10,101,110-113,1
The resin electrodes Nos. 18 to 121, 143 to 148, and 152 to 154 are those in which the range of each of the components of the conductive* family used in the electrodes is outside the range of FIG. 4 A to E. 69. The resistance drift is also extremely low and the wear resistance is poor, resulting in unsatisfactory performance as an ID electrode for biological use.

For reference, do not apply conductive paint to the protruding part of the conductive electrode, and apply the same IIK to the electrode only.
When tested, the resistance drift exceeded IKΩ in one reciprocating motion, and was 2 to 31! I was disappointed because the reciprocating motion of ai resulted in a value of lO exceeding Ω, which was far from the characteristics required for a p1 bioelectrode.

Next, we prepared rounded conductive material to obtain an electrode body with more preferable wear resistance and small resistance drift.
It is shown in the section.

The part indicated by F in the same table is the same as the above-mentioned table-Rei and You-I.
Samples 115, 117, 124, 133, 137 are shown, and the part G is the samples 127 to 130.1 of the above table amount.
34.138.139, and the part H is the sample ff1131゜132.135.136 of the above Table-Otori and Table-■.
．． 149.150, and the part marked ■ is shown in Samples 155 to 160 in Table ■ above, which have small resistance drifts of less than 2Ω or 2 to 5Ω, and have good wear resistance. Ta.

Moreover, the compositional range of the essential components that can be most preferably used in the present invention is the tlJJ%KK rounded part. In the same figure, part J is Samples 131, 132, 13 of Table-■
5,136 and Table-■ sample Na149, and
In Figure 6, part K is sample 155, 15 in Table ■.
7,151j, and all of these have favorable characteristics such as a small resistance drift of less than 2Ω, and wear resistance that can withstand reciprocating motion of 100Ω or more.

To produce such a tlcnb conductive paint, a synthetic resin is mixed with a suitable solvent, such as an alpour solvent, an aromatic hydrocarbon IAiII! Dissolved in organic solvents of 1 or 21/s or more, such as solvents, aliphatic hydrocarbon solvents, ester solvents, ketone solvents, chlorinated hydrocarbon solvents, and ether M solvents such as ethylene dalicol methyl ether. A synthetic 411 pus bath solution is obtained by adding silver powder and carbon powder of a predetermined amount to the solution and uniformly mixing and dispersing it with a dispersing machine such as a Porrunle. In addition, plasticizers, pigments, dyes, dispersants, anti-settling agents, antioxidants, rust-casting agents, chemotactic inhibitors, antifoaming agents, etc. used in ordinary conductive paints are commonly used in the conductive category. It is also possible to include the amount. The conductive paint is applied to the connection center 13 of the lead m of the electrode body l by a known coating method such as brush coating, spray coating, or dipping coating, and is dried and hardened to form a coating.

The thickness K of Ko 114 is suitable for 50 to 100 Kishinawate, although there is no Senkai. ' As stated above, the biological conductive l1III electrode of the present invention has a conductive a of the above composition on the lead 1m connection protrusion of the electrode body.
Since the membrane is formed by the lead wire, it can withstand the friction of the metal clamping piece at the tip of the lead, and the resistance drift is extremely small.As a result, it is possible to extract accurate biological signals without generating noise.

4. Simple and clear drawings Figure 3 shows an embodiment of the present invention, and is a cross-sectional view. Figure 1 shows conductive resin electrodes with conductive resin applied only to the contiguous protrusions. There are many good ones to apply.

Figure 1s3 shows this electrode entirely coated with conductive paint.

Figure 2 shows the electrode glue in Figure 1 and Figure J13. 69 in the triangular locus Ii diagram, and Fig. 4 shows range examples A and B%C of the present invention.
1D, E is shown, and the preferred range example is F%G, H,
Figure 6 shows the four most preferred medical examples J and K.

l...Bioconductive resin electrode 4... Conductive paint film 13...Lead wire connection center line

Claims (1)

[Claims] (1)! J-do! The lead-connection projections of the nine electrode body are integrally molded with conductive resin and have Il connection protrusions, and the synthetic resin 5-layer lid is covered with 5% to 25ml of silver powder, and the IK powder is 90% to 60%.
J [jlX, jy-hon powder 511% ~ 151I amount X
conductive paint containing or synthetic resin 15]k amount% to 25]
[Amount%, silver powder 701m% to 501fi%, carbon powder 1
5111
conductive paint containing 5% by weight of carbon powder, 25% by weight of carbon powder to 52.5% by weight, or 27.5% by weight to 42% by weight of synthetic IIl.
．． 5%, silver powder 201 [lid% - 25wt%, carbon powder 5
Conductive IT family or synthetic resin containing 25% to 551% by weight, or synthetic resin 27.5]k11iN to 425% by weight, silver powder 17.
A conductive resin electrode for biological use formed by forming a coating film of a conductive paint containing 5% to 70% by weight and 955% to 70% by weight of Carbo. (2. The conductive paint described in claim 1 is composed of synthetic resin 17.5m11% to 37.5%, silver powder 57.5% to 30% by weight, and carbon powder 251kN to 32.5% by weight. Conductive paint or synthetic resin containing lid% 22.52iiL
1t% ~ 37.5] It%, silver powder 45]k amount ~ 20T
L'jIk%, carbon powder 3251 iris% - 425 iris award%
4-electroconductive paint or synthetic resin containing 27°51 to 1% ~
37.5% by weight, silver @ 30130 5% carbon powder, carbon powder 415] 1f [%~60%]
or synthetic resin 27.5% to 37.5%, silver powder I
L5 heavy lid% ~ 25mm lid%, carbon powder 60IitX ~ 7
It consists of a 11L-based paint containing 0-weight ILN.
Biological conductive resin electrode formed by membrane formation. (3) Specific Fffm required range The conductive paint described in item 1 contains 27.5m of synthetic resin 11% to 3251% by weight, silver powder 25% to 7.5111%, and carbon y947.51j 1% to
- Conductive *family containing tioljtX, or synthetic 11 fat 2
7.5 m children% to 325% by weight, silver powder 125% by weight to 7
．． A conductive resin electrode for biological use is made of a conductive IIIk material containing 5% by weight, Carbore 1 & 60% by weight and 65% by weight.