JP2000000221A - Sheet for electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the feel of use, durability and productivity by forming an electrode sheet for acquiring electric signals from an examinee's body surface by alternately and integrally knitting and weaving sections having electrical conductivity and non-conductive sections. SOLUTION: At the time of forming the sheet for electrodes used in order to acquire the cardiographic waveforms and cardiac rates of the testee, the portions corresponding to the electrodes for 3 for the head and the electrodes 4 for the feet are woven by inserting a suitable number of conductive threads 5 as weft and using all nonconductive threads as warp in weaving a series of sheet bases. The long-sized sheet having the plural electrodes is obtd. by successively repeating such weaving work. The long-sized sheet is cut in the state arranged with the electrodes 3 for the head and the electrodes 4 for the feet as a pair at one sheet, by which the required sheet for the electrodes is formed. The electrodes 3 for the head and the electrodes 4 for the feet are formed by adjusting the weaving positions in such a manner than these electrodes are arranged in the positions corresponding to the head and the feet according to the examinee's body shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode sheet for obtaining an electrocardiographic waveform and a heart rate of a subject.

[0002]

2. Description of the Related Art In recent years, there has been reported a method of acquiring an electric signal of a body surface without restriction using an electrode incorporated in a fiber cloth (IEEE TRANSACTION ON B).
IOMEDICAL ENGINEERING, VO
L. 40, NO6, P593-594 1993). In this method, a pillow cover and sheets are made of conductive fibers and a heartbeat signal is collected by placing the subject on the pillow cover and sheets. Further, according to this, the electrode arrangement having a stationary positional relationship with respect to the electric vector derived from the heart can be maintained, so that a stationary waveform of the second lead of the electrocardiogram can be obtained. Therefore, it is effective for diagnosis of cardiac function. Furthermore, according to this method, it is not necessary to fix the electrode to the body surface of the subject, so that measurement can be performed in a natural state. Conventionally, as shown in FIG. 1, an electrode woven with conductive fibers 2 on a non-conductive sheet 1 is divided and attached as a head electrode 3 and a foot electrode 4 of a human body as shown in FIG. Or sewn. However, such integration by sticking and sewing results in a step at the boundary surface with the sheet, resulting in poor appearance and usability. In addition, a problem such as peeling occurs depending on the method of sticking and sewing. In addition, at the time of manufacture, two types of fabric electrodes are placed one on a sheet as a base.
There is a problem that the sheets must be stuck or sewn, resulting in extremely low productivity and high cost.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a sheet-like electrode capable of acquiring biological information by acquiring an electrical signal such as an electrocardiogram or a heartbeat without restraining the subject. An object of the present invention is to provide a novel electrode sheet which has excellent usability, durability, and productivity.

[0004]

That is, the present invention relates to an electrode sheet for acquiring an electric signal from the body surface of a subject, and alternately and integrally knitting conductive portions and non-conductive portions.
Woven, two independent conductive parts are configured as one unit, conductive parts are arranged over a certain width at positions corresponding to the head and feet of the human body, conductive by conductive fibers The non-conductive part is knitted and woven with a non-conductive fiber, the conductive fiber is woven into the warp or weft, or both the warp and the weft, and the conductive part is conductive on both sides of the conductive part. The present invention relates to the provision of an electrode sheet characterized by having a high fiber weaving density, extending both sides of a conductive portion, and folding the sheet over a sheet body.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments will be described with reference to the illustrated drawings, but the present invention is not limited thereto. FIG. 2 illustrates an electrode sheet of the present invention. As shown in FIG. 1 (a), in the construction of a series of sheets, a suitable number of conductive yarns 5 are inserted as wefts into portions corresponding to the head electrode 3 and the foot electrode 4 in weaving a series of sheets. On the other hand, weaving using all non-conductive yarns as warp yarns,
By repeating this sequentially, a long sheet having a plurality of electrodes is obtained. The sheet for the electrode obtained in this way is, as shown in FIG.
The electrode 4 is cut in a state in which the foot electrodes 4 are arranged in pairs on a single sheet to form an electrode sheet. In addition, the head electrode 3 and the foot electrode 4 are arranged at positions corresponding to the corresponding parts according to the body shape of the subject. The width is set to a width sufficient for detection. FIG. 3 illustrates an electrode sheet of the present invention which is woven vertically using a conductive yarn as the warp. In the woven fabric having such a configuration, the sheet for electrode having the same configuration as described above is obtained by cutting along the line AA in FIG. In this configuration, a loom capable of weaving corresponding to the vertical width of the cut sheet is required. FIG. 4 shows a preferred configuration for reducing the resistance of the head electrode 3 and the foot electrode 4. As shown in FIG. 2A, the conductive yarns 5 are inserted at regular intervals in the warp direction, and the weft is woven with the conductive yarns having a constant width in the same manner as the structure described in FIG. . The sheet woven in this manner removes the conductive yarn of the warp existing in the non-conductive portion 6 as shown in FIG. The yarn 5 constitutes a conductive portion interwoven. In such a configuration, it is preferable to float and weave only the relevant portion so that the conductive warp can be easily cut off. Such a method of leaving only the unnecessary portions can be dealt with by ordinary weaving by so-called “betrayal” or “face-up”. The electrode sheet thus configured has a lower resistance value than that of a sheet composed only of the weft yarns, so that a weaker electric signal can be obtained. In addition,
As for the conductive yarn to be inserted as the warp, the resistance of the conductive portion decreases as the insertion interval decreases, but the weaving strength in the non-conductive portion except as an unnecessary portion decreases. Therefore, considering the weaving strength, the interval is suitably at least 3 mm, preferably at least 5 mm. FIG. 5 shows a configuration in which conductive warp yarns 5 are woven in a ribbon shape at both ends 7, 8 of the conductive portion. In such a configuration, when it is necessary to acquire a finer electric signal, this is made possible by inserting warp yarns more densely in a portion unnecessary for signal acquisition, and the resistance of the fabric electrodes on the head and foot is reduced. Further, a weaker electric signal can be obtained. In such a configuration, since it is necessary to cut off the electrical contact between the head and the foot, the conductive yarn floated and woven on the portion except for both ends is cut off in the same manner as described in FIG. As shown in FIG. 6 (a), both ends 7, 8 in which a warp is inserted in a ribbon shape are cut off at a portion corresponding to a non-conductive portion between the head and the foot, and as a result, the conductive portion is removed. The head and the foot part are configured to protrude. Further, in such a state, the conductive portion protrudes outward, and thus the sheet is folded inward to obtain an electrode sheet having another configuration.

In each of the above examples, when a conductive yarn is inserted into the weft or when inserted as a warp in the form of a ribbon, the detection accuracy and the feel to the skin or the like during use are taken into consideration. It is selected whether the yarn is used alone or a non-conductive yarn is appropriately mixed. The conductive yarn used in the present invention is a yarn made of a conductive fiber and having a predetermined thickness (for example, 130 denier), and is a metal yarn such as gold, silver, or copper, or a conductive yarn such as polyaniline or polyacetylene. Silver filaments composed of multifilaments, which are bundles of a hydrophilic polymer and silver-plated nylon filaments (for example, Sauq
oit, X-static (trade name)), a filament yarn or a spun yarn (twisted yarn) made of acrylic fiber, nylon fiber, or polyester fiber containing copper sulfide and nickel, or a conductive yarn and a non-conductive yarn. Cotton thread, acrylic,
Core yarn, ply yarn, ply twist yarn, mixed woven yarn, and spun yarn (twist yarn) with nylon and polyester yarns can be used. On the other hand, as the non-conductive yarn, cotton yarn, acrylic, nylon, polyester yarn or the like can be used.

Hereinafter, a specific example will be described.

Example 1 X made by Sauqit having a thickness of 130 denier and a resistance value of 2.86 Ω / cm (PP) consisting of 34 filaments having a diameter of 3.3 μm / 1 was used as a conductive yarn.
-Static (trade name) (silver plated nylon thread)
The sheet for the electrode of the present invention was woven on a Jacquard loom using a twisted yarn obtained by twisting two 100-th cotton yarns as non-conductive portions. FIG. 7 shows the woven size. As described with reference to FIG. 6, the sheets having such a configuration were formed by cutting unnecessary portions, folding back the protruding portions and overlapping the main body, and further suturing the sheets to form a target electrode sheet. The conductivity of the sheet for electrode thus obtained was evaluated by a resistance measuring instrument. The results are shown in Table 1. As a control, a plain-woven cloth electrode in which X-STATIC and No. 30 cotton yarn were inserted vertically and horizontally at a ratio of 4: 2 was sewn to the head and foot.

[0008]

[Table 1] From the above results, it can be seen that the sheet for the electrode of the present invention constituted in Example 1 has a value of about half or less of the conventional conductive sheet which is a control group in resistance, and is extremely excellent in electrocardiogram acquisition performance. confirmed. Further, the result of collecting an electrocardiogram using such an electrode sheet is shown in FIG. 8, and it was confirmed that a good electrocardiographic waveform could be obtained and that the electrocardiograph functioned sufficiently as an electrode. The sheets in the control section had a plain woven fabric electrode attached thereto, so that a step was formed in the stitched portion, which was extremely uncomfortable in use. Because of the structure, there is no step and the comfort is excellent.

[0009]

The sheet for an electrode according to the present invention is easy to manufacture and has excellent detection accuracy, and has no step, so that it has excellent usability. In the above configuration, the woven fabric is used in the above example, but a knitted fabric may be used.
For example, the conductive portion may be partially switched to a conductive yarn during knitting, or a conductive portion may be integrally formed by knitting with a non-conductive yarn.

[Brief description of the drawings]

FIG. 1 is a plan view showing a manufacturing process of a conventional electrode sheet.

FIG. 2 is a plan view illustrating the invention.

FIG. 3 is a plan view showing another example of the present invention.

FIG. 4 is a plan view showing another example of the present invention.

FIG. 5 is a plan view showing another example of the present invention.

FIG. 6 is a plan view showing a processing step of the electrode sheet configured in FIG. 5;

FIG. 7 is a plan view showing the size of an electrode sheet obtained in an example of the present invention.

FIG. 8 is a waveform of an electrocardiogram collected by the electrode sheet obtained in the example of the present invention.

[Explanation of symbols]

 3 Head electrode 4 Foot electrode 5 Conductive thread 6 Non-conductive part

Claims (7)

[Claims] An electrode sheet comprising knitted and woven alternately and integrally with conductive portions and nonconductive portions. 2. The sheet for an electrode according to claim 1, wherein two independent conductive portions are configured as one unit. 3. The sheet for an electrode according to claim 2, wherein the conductive portions are arranged over a fixed width at positions corresponding to the head and feet of the human body. 4. The sheet for an electrode according to claim 1, wherein a conductive portion is knitted and woven by a conductive fiber and a non-conductive portion is formed by a non-conductive fiber. 5. The sheet for an electrode according to claim 4, wherein the conductive fiber is woven into a warp or a weft, or both a warp and a weft. 6. The sheet for an electrode according to claim 4, wherein the weaving density of the conductive fiber is high on both sides of the conductive portion. 7. An electrode sheet comprising both sides of a conductive portion extending therefrom and being folded on a sheet body.