JPH041925Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a biological terminal electrode used in electrocardiographs, electroencephalograms, etc., and allows easy and accurate detection of electrical signals, especially when taking a bath. It relates to things that are configured so that they can be carried out.

(Conventional technology) When recording and analyzing bioelectrical phenomena detected by biological terminal electrodes (hereinafter referred to as ECG electrodes) and using them for diagnosis, it is necessary to make comprehensive judgments based on bioelectrical phenomena under various environmental conditions to improve the effectiveness of bioelectrical phenomena. It is necessary to link this to appropriate treatment. As one of the environmental conditions, electrocardiographic signals during bathing or water bathing are considered to be important analysis materials.

By the way, the present inventors have developed the ECG electrode shown in FIG. 4. The ECG electrode is
A circular electrode base 1 made of a magnetic material such as ferrite that is attracted by a magnet provided in a connector (not shown) is held in an opening 2a of a circular case 2 made of an electrically insulating material such as synthetic resin. An electrode 1a made of silver chloride or the like is fixed to a base 1, and an adhesive sheet 3 having a circular or other shape for attachment to the human body is attached to a case 2.
A sponge 5 impregnated with a conductive gel is placed on the electrode base 1, and the sponge 5 is fixed to the case 2 together with the electrode 1a and the electrode base 1 using an adhesive 6.

In the ECG electrode having the structure shown in FIG. 4, it is preferable to use a nonwoven fabric as the adhesive sheet 3 in order to improve its conformity to the human body and to improve air permeability and water permeability. When this ECG electrode is used for diagnosis during bathing etc., assuming that the electrode and the connector (not shown) are waterproof, capillary action in the adhesive sheet 3 made of non-woven fabric will cause the sponge 5 and the electrode base 1 to leak. There is a problem in that water floods into the area, causing electrical signal leaks.

On the other hand, as another example of a conventional product that can prevent water intrusion, there is a product using a closed-cell foam material instead of the adhesive sheet 3. However, although this foam material has excellent waterproof properties, it does not have breathability or water permeability, so sweat generated during bathing accumulates between the human skin and the foam material, and this sweat is transferred to the sponge 5. There is a risk that a conductive path may be formed between the conductive gel impregnated with the external water or hot water. This sweat accumulation and electrical conduction are caused by the fact that the foam material has a weak adhesive force, and in order to increase this adhesive force, the area is increased, and because it is thick, it does not fit well with human skin. encouraged.

(Problems to be solved by the invention) The present invention solves the above-mentioned problems, makes it possible to use an adhesive sheet made of a material that is compatible with the human body, and prevents leakage of electrical signals from the electrodes. The purpose of the present invention is to provide a waterproof ECG electrode with a liquid-containing structure.

(Means for solving the problem) In order to achieve this purpose, the waterproof type of the present invention
The ECG electrode has a water-impermeable ring-shaped waterproof sheet fixed to the lower surface of the periphery of the case that has the electrode and a sponge impregnated with conductive gel, and a breathable, ring-shaped waterproof sheet is fixed to the outer peripheral side of the waterproof sheet. It is characterized in that the inner circumferential portion of a water-permeable pressure-sensitive adhesive sheet is fixed.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a longitudinal sectional view showing an ECG electrode according to the present invention, and FIG. 2 is a bottom view thereof. 1 and 2, the same reference numerals as in FIG. 4 indicate structural members having the same functions. Reference numeral 7 denotes a water-impermeable ring-shaped sheet fixed to the lower surface of the peripheral edge 2b of the electrode case 2 with an adhesive 8 or the like, and the sheet 7 is made of a closed-cell foam material.
An adhesive 9 for adhesion to the human body is applied to the lower surface of the sheet 7. As the foam material constituting the sheet 7, foamed plastics such as polystyrene, polyurethane, vinyl chloride resin, polyethylene, or sponge rubber are used.

The adhesive sheet 3 is made of a breathable and water-permeable material such as non-woven fabric, and an adhesive 9 or the adhesive sheet 3 itself is coated on the outer peripheral side of the lower surface of the sheet 7, leaving a portion Δr on the inner peripheral side of the lower surface of the sheet 7. It is fixed with adhesive.

According to this configuration, when the adhesive sheet 3 and the sheet 7 are attached to a human body and a person is taking a bath or performing a water bath test, water (including hot water) permeates from the outside to the inside along the adhesive sheet 3 due to capillary action. Even if the sponge 5 is exposed to water, water is prevented from penetrating into the non-breathable sheet 7 portion, water is prevented from penetrating into the sponge 5 portion, and the conductive gel inside the sponge 5 is prevented from conducting with outside water. Prevented.

Further, even if sweat occurs between the adhesive sheet 3 or the sheet 7 and the human body, the sweat is absorbed by the water-permeable adhesive sheet 3 and released to the outside, and does not accumulate.

Figure 3 shows a waterproof type as an application example of the above embodiment.
This is an ECG electrode device, and the ECG electrode A has a closed-cell ring-shaped sealing material 20 fixed to the upper surface of the peripheral edge 2b of the electrode with an adhesive 19. Connector B has an electrode base 1 made of the magnetic material.
It has a permanent magnet 11 that attracts
is held by a circular yoke 12, and the circular yoke 1
Solder the lead wire 13 for external instrument connection to 2 14
The connector B is constructed by integrally molding and covering a part of the yoke 12 and the soldering portion 14 with an electrically insulating connector body 15 made of synthetic resin. The outer diameter of the yoke 12 is such that the portion exposed from the connector main body 15 is slightly smaller than the inner diameter of the opening 2a provided in the case 2, so that the yoke 12
and the electrode base 1 are in contact with each other and are attracted to each other.

A circular protrusion 15a is formed around the lower surface of the connector body 15, a circular recess 16 is formed between the protrusion 15a and the yoke 12, and a closed-cell foam is formed in the circular recess 16 with an adhesive 17. A ring-shaped sealing material 18 made of material is fixed. The circular recess 16 and the sealing material 18 are provided in a portion corresponding to the circular protrusion 2c around the central opening 2a of the case 2 of the ECG electrode A.

According to the configuration of this application example, as shown in the figure, by inserting the yoke 12 into the opening 2a of the case 2 and bringing it into contact with the electrode base 1 made of a magnetic material, the electrode base 1 is moved by the permanent magnet 11. Aspirate and connect connector B to ECG electrode A. In this case, there is no need to press connector B against ECG electrode A. Also, at this time, the protruding portion 15a of the connector body 15 is moved toward the sealing material 20 by the magnetic attraction force.
At the same time, the protrusion 2c of the case 2 comes into pressure contact with the sealing material 18. Therefore, water is prevented from entering between the two.

In addition, as in this application example, the sealing material 20 or 18 may be applied to the case 2 or the connector body 15 in advance.
If it is fixed to the ECG using the magnetic attraction force.
When connecting the connector B to the electrode A, the two can be connected with one touch, waterproof property can be obtained, and the operability is good.

Further, as shown in the figure, a sealing material 18 is provided in the circular recess 16 provided in the connector B, and the circular recess 16 is provided with a sealing material 18.
The protrusion 2 of the case 2 of the ECG electrode A that is fitted to the
Since the sealing material 18 is compressed by c, a reliable sealing effect can be obtained without causing any misalignment between the sealing material 18 and the protrusion 2c. Also, as shown in the figure, two sealing materials 20, 1
8, even if water intrusion occurs due to the large-diameter ring-shaped sealing material 20 on the outer circumferential side, the small-diameter ring-shaped sealing material 18 on the inner circumferential side will prevent water from entering the interior, and only one of them can be prevented. A more reliable sealing effect can be obtained compared to the case where the seal is provided. Further, in order to improve the sealing performance, by applying a water repellent to the surface of the sealing material 18 or 20, the water-proofing effect is promoted, sealing can be performed with only one side, and the structure is simplified.

In the above embodiment, the adhesive sheet 3 was fixed to the lower surface of the sheet 7, but the present invention could be implemented by sandwiching and fixing the inner peripheral part of the adhesive sheet 3 between the sheet 7 and the peripheral edge 2b. In this case, various changes and additions can be made to the shape and structure of each component, without being limited to the above embodiments, without departing from the gist of the present invention.

(Effects of the invention) As described above, in this invention, a water-impermeable ring-shaped waterproof sheet is fixed to the lower surface of the peripheral edge of the electrode case holding the electrode and the sponge impregnated with conductive gel. Since the inner periphery of a water-permeable adhesive sheet is fixed to the outer periphery of the sheet, it is possible to prevent water from seeping through the adhesive sheet of the ECG electrode, and the conductive gel inside the sponge is prevented from contacting external water. It is possible to provide a waterproof ECG electrode that is prevented from being conductive and can be tested while bathing or in water.

Further, even if sweat occurs between the adhesive sheet or waterproof sheet and the human body, the sweat is absorbed by the water-permeable adhesive sheet and does not accumulate.

In addition, since the adhesive sheet is flexible, it conforms well to the human body, does not peel off, and can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the ECG electrode according to the present invention, FIG. 2 is a bottom view thereof, FIG. 3 is a longitudinal sectional view showing an ECG electrode device as an application example of the above embodiment, and FIG. 1 is a longitudinal cross-sectional view showing the structure of a conventional ECG electrode.

Claims (1)

[Scope of utility model registration request] A water-impermeable ring-shaped waterproof sheet is fixed to the lower surface of the periphery of the case that has the electrode and the sponge impregnated with conductive gel, and the outer periphery of the waterproof sheet has air permeability and water permeability. A waterproof biomedical terminal electrode characterized by having the inner periphery of an adhesive sheet fixed.