CN116421190A - Flexible fabric electrocardio electrode and preparation method and application thereof - Google Patents
Flexible fabric electrocardio electrode and preparation method and application thereof Download PDFInfo
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- CN116421190A CN116421190A CN202310243116.7A CN202310243116A CN116421190A CN 116421190 A CN116421190 A CN 116421190A CN 202310243116 A CN202310243116 A CN 202310243116A CN 116421190 A CN116421190 A CN 116421190A
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- 239000004744 fabric Substances 0.000 title claims abstract description 87
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 55
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 55
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 5
- 239000010935 stainless steel Substances 0.000 claims abstract description 5
- 238000009941 weaving Methods 0.000 claims abstract description 5
- 229920000742 Cotton Polymers 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 14
- 238000009958 sewing Methods 0.000 claims description 8
- 229920002972 Acrylic fiber Polymers 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- 238000005229 chemical vapour deposition Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 230000010354 integration Effects 0.000 abstract description 2
- 230000033001 locomotion Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 229910021607 Silver chloride Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000499 gel Substances 0.000 description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 3
- 239000004753 textile Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 208000024172 Cardiovascular disease Diseases 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 210000004243 sweat Anatomy 0.000 description 2
- 206010020751 Hypersensitivity Diseases 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 230000007815 allergy Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 229920005570 flexible polymer Polymers 0.000 description 1
- 239000000017 hydrogel Substances 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009964 serging Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/251—Means for maintaining electrode contact with the body
- A61B5/256—Wearable electrodes, e.g. having straps or bands
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/263—Bioelectric electrodes therefor characterised by the electrode materials
- A61B5/27—Conductive fabrics or textiles
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
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- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
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- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
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- Cardiology (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The invention provides a preparation method of a flexible fabric electrocardio electrode, which comprises the following steps: twisting the carbon nanotube fiber to obtain a carbon nanotube yarn; selecting warp yarns, and weaving the carbon nanotube yarns serving as weft yarns in a plain weave structure to obtain a fabric electrode slice; assembling the fabric electrode plate with conductive sponge and stainless steel cloth, and fixing the periphery by using carbon nanotube yarns in a lockstitch manner to obtain a carbon nanotube laminated fabric electrode; the laminated fabric electrode is combined with the elastic band to form an electrocardiographic band. The flexible fabric electrocardio-electrode prepared by the preparation method provided by the invention has the advantages of high conductivity, low impedance with skin, flexibility, easiness in integration, clothing and the like, and can be used for stably detecting heart rate and monitoring electrocardiogram.
Description
Technical Field
The invention belongs to the field of textile materials, and particularly relates to a flexible fabric electrocardio-electrode, a preparation method and application thereof.
Background
With the development of intelligent wearable technology, people pay more attention to intelligent monitoring clothing. The flexible bioelectric dry electrode can be used for collecting physiological electric signals of a human body, such as electrocardio signals, electroencephalogram signals and the like, and is an important component of intelligent monitoring clothing. According to the data, the prevalence of cardiovascular disease is in a continuously rising phase. Real-time monitoring is realized through the wearable monitoring equipment, so that patients, especially the elderly population, are helped, the purposes of early discovery and early treatment are realized, and the death rate of cardiovascular diseases is reduced.
At present, the most commonly used electrode in electrocardiographic monitoring is an Ag/AgCl gel electrode, but hydrogel in the middle of the Ag/AgCl gel electrode is easy to lose water, so that the performance of the electrode is affected. In addition, the user may experience allergies and inflammation when exposed to the Ag/AgCl gel electrode for a long period of time. In view of the above, a number of dry electrodes (flexible fabric electrocardiograph electrodes) using flexible polymers as substrates have been developed, which solve the problems of easy drying, poor air permeability and poor comfort in the long-term measurement process.
But the contact area of the textile electrode and the skin is smaller, the contact impedance of the skin is larger, and the accuracy of measuring the electrocardio is affected to a certain extent. Meanwhile, the fabric electrode in the current stage is easy to oxidize, the conductivity is reduced, the heart rate cannot be monitored stably and accurately, and the electrocardiogram is difficult to test.
Therefore, there is an urgent need for an electrocardiograph electrode that has good comfort and can accurately and stably monitor electrocardiograph signals.
Disclosure of Invention
In view of the above, the present invention aims to provide a flexible fabric electrocardiograph electrode and a preparation method thereof. The invention aims to solve the problems that the existing electrocardio-electrode has poor comfort, is easy to oxidize, has reduced conductivity and cannot stably and accurately monitor heart rate.
In order to achieve the above purpose, the invention provides a preparation method of a flexible fabric electrocardio-electrode, which comprises the following steps:
s1, selecting carbon nanotube fibers as a base material, and twisting the carbon nanotube fibers by using a twisting machine to obtain carbon nanotube yarns, namely weft yarns;
s2, selecting warps, and weaving the warps and the wefts in a plain weave structure by taking the carbon nanotube yarns prepared in the step S1 as wefts to obtain a fabric electrode slice;
s3, assembling the fabric electrode sheet prepared in the step S2 with conductive sponge and stainless steel cloth, and after the assembly is completed, performing edge-locking fixation on the periphery by using carbon nanotube yarns to obtain a carbon nanotube laminated fabric electrode;
s4, sewing the carbon nano tube laminated fabric electrode prepared in the step S3 on the inner side of an elastic band, sewing a first hidden button connected with a sensor on the outer side of the elastic band, and leading out a second hidden button connected with a carbon nano tube yarn from the carbon nano tube laminated fabric, wherein the first hidden button is detachably connected with the second hidden button, and finally obtaining the electrocardio-band, namely the electrocardio-electrode of the flexible fabric.
Further, the weft yarn includes 22 carbon nanotube fibers and 1 cotton thread after pretreatment.
Further, the carbon nanotube fibers are prepared by a CVD method.
Further, the warp is pure cotton yarn, acrylic/cotton blended yarn, silk yarn, carbon nanotube yarn or polyester yarn.
Further, the warp is acrylic/cotton blended yarn.
Further, the composite cotton thread consists of 66.3% cotton and 33.7% acrylic.
Further, the contact area of the electrocardio electrode of the flexible fabric is 7.07cm 2 。
Further, the two ends of the elastic band are connected through the magic tape.
The invention also provides a flexible fabric electrocardio electrode which is applied to electrocardio signal acquisition and electrocardiogram test.
The invention has the beneficial effects that:
1. the invention provides a preparation method of a flexible fabric electrocardio electrode, which selects stable and low-impedance carbon nano tube yarns which are nontoxic to human bodies as electrode materials, interweaves the carbon nano tube yarns with other yarns (cotton, silk, carbon nano tube yarns and the like) to prepare a fabric electrode sheet in a plain weave structure, then uses the carbon nano tube yarns to sequentially combine the fabric electrode sheet, conductive sponge and electromagnetic shielding cloth, then uses an elastic band to fix the fabric electrode at the lower chest rib of a user, and uses a single lead mode to finish the electrocardiograph test. The flexible fabric electrocardio-electrode prepared by the method has the advantages of high conductivity, low impedance with skin, flexibility, easy integration, clothing and the like.
2. The invention provides a preparation method of a flexible fabric electrocardio electrode, wherein the weft is twisted carbon nano tube yarn, and the conductivity of the yarn is improved by 2.5 times compared with that of single fiber; the invention uses the laminated fabric electrode structure, can reduce the generation of motion artifacts, has the electromagnetic shielding effect, and can improve the acquisition quality of electrocardiosignals. The impedance between the electrocardio electrode and the skin of the flexible fabric prepared by the method is 1.2 omega, which is lower than that of a commercial 3M electrode.
3. The invention provides a flexible fabric electrocardio electrode, wherein the R-R rule is similar to POLAR heart rate belt monitoring data under specific motion and different speeds, the electrocardiogram waveform is complete, baseline drift does not occur, and the electrocardio signal monitoring under the daily state can be completed. The flexible fabric electrocardio electrode can not only stably detect heart rate, but also monitor an electrocardiogram, has low impedance with skin, wide testing range and stable data, is sweat-resistant, and can stably monitor electrocardio signals after being worn for a long time. Meanwhile, the flexible fabric electrocardio electrode is soft and flexible, has high sweat absorption and ventilation performance and high human body compatibility, and can solve the problem of low comfort of the film coating electrode.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
FIG. 1 is a flow chart of a method for preparing a flexible fabric electrocardio-electrode of the invention;
FIG. 2 is a longitudinal SEM image of carbon nanotube fibers at different magnifications;
FIG. 3 is a schematic diagram of the structure of a CNTT-acrylic/cotton blend laminated fabric electrode;
FIG. 4 is a schematic diagram of three electrode method for testing the impedance of fabric electrodes;
FIG. 5 is a schematic diagram of the impedance between the test electrode and the skin;
FIG. 6 is a graph showing the impedance contrast of CNTT-acrylic/cotton blend electrodes and 3M electrodes using the three electrode method;
FIG. 7 is a graph showing the impedance contrast between CNTT-acrylic/cotton blend electrode and 3M electrode and skin;
FIG. 8 is a schematic structural view of an electrocardiographic belt;
FIG. 9 is an electrocardiogram under certain exercise conditions;
fig. 10 is an electrocardiogram at different movement speeds.
Detailed Description
In order to make the technical scheme, advantages and objects of the present invention more clear, the technical scheme of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiment of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without creative efforts, based on the described embodiments of the present invention belong to the protection scope of the present application.
As shown in fig. 1, the invention provides a preparation method of a flexible fabric electrocardio-electrode, which comprises the following steps:
s1, selecting carbon nanotube fibers as a base material, and twisting the carbon nanotube fibers by using a twisting machine to obtain carbon nanotube yarns, namely weft yarns;
s2, selecting warps, and weaving the warps and the wefts in a plain weave structure by taking the carbon nanotube yarns prepared in the step S1 as wefts to obtain a fabric electrode slice;
s3, assembling the fabric electrode sheet prepared in the step S2 with conductive sponge and stainless steel cloth, and after the assembly is completed, performing edge-locking fixation on the periphery by using carbon nanotube yarns to obtain a carbon nanotube laminated fabric electrode;
s4, sewing the carbon nano tube laminated fabric electrode prepared in the step S3 on the inner side of an elastic band, sewing a first hidden button connected with a sensor on the outer side of the elastic band, and leading out a second hidden button connected with a carbon nano tube yarn from the carbon nano tube laminated fabric, wherein the first hidden button and the second hidden button are detachably connected, and finally obtaining the electrocardio band shown in figure 8, namely the electrocardio electrode of the flexible fabric.
Example 1
The preparation method of the electrocardio belt by using the CNTT-acrylic fiber/cotton blended laminated fabric electrode comprises the following steps:
(1) Selecting 22 carbon nanotube fibers (CNTF) and 1 cotton thread after pretreatment, and twisting the 22 CNTF and 1 cotton thread by using a twisting machine to prepare weft yarns of a fabric electrode; the carbon nanotube fibers of the embodiment are prepared by adopting a CVD method;
(2) Selecting acrylic fiber/cotton blended yarns (66.3% of cotton and 33.7% of acrylic fiber) as warp yarns, and weaving the warp yarns and the weft yarns with a plain weave structure by taking the weft yarns prepared in the step 1 as weft yarns to obtain a fabric electrode slice;
(3) Assembling the fabric electrode slice prepared in the step 2 by sequentially using conductive sponge and stainless steel cloth, and fixing and serging the periphery by adopting carbon nanotube yarns (CNTT), so as to obtain a CNTT-acrylic/cotton blended laminated fabric electrode, wherein the structure of the CNTT-acrylic/cotton blended laminated fabric electrode is shown in figure 3;
(4) Sewing the CNTT-acrylic fiber/cotton blended laminated fabric electrode prepared in the step 3 on the inner side of an elastic band, sewing a first hidden button connected with a sensor on the outer side of the elastic band, leading out a second hidden button connected with a carbon nano tube yarn from the carbon nano tube laminated fabric, wherein the first hidden button is detachably connected with the second hidden button, and connecting two ends of the elastic band through a magic tape to finally obtain an electrocardiograph band, namely a flexible fabric electrocardiograph electrode, wherein the effective contact area of the flexible fabric electrocardiograph electrode is 7.07cm 2 。
Specificity test
As shown in fig. 2, fig. 2 is a longitudinal SEM image of carbon nanotube fibers at different magnifications, and it can be seen that the CVD method for preparing carbon nanotube fibers (CNTF) has a good longitudinal alignment.
As shown in fig. 4-7, the impedance of the fabric electrode and the impedance between the test electrode and the skin were measured by the three-electrode method. C can be seen from FIG. 6The impedance of the NTT-acrylic/cotton blended fabric electrode is 1.2 omega, which is far lower than that of a 3M electrode; from FIG. 7, it can be seen that the impedance of the CNTT-acrylic/cotton blend fabric electrode and the impedance of the 3M electrode are both 10 4 -10 5 The impedance of the electrode of the CNTT-acrylic/cotton blended fabric is approximately 25000 omega, the impedance of the 3M electrode is 73000 omega, and the impedance between the 3M electrode and the skin is 2.9 times of the impedance between the CNTT-acrylic/cotton blended electrode and the skin.
Electrocardiogram testing
The test personnel wear the electrocardiographic belt to carry out electrocardiographic tests under static, specific exercise and different running speeds.
Specific actions include bending over, twisting waist, chest expanding movement, arm up-and-down swing and double-arm flat lifting; the different running speeds were 0Km/h,3Km/h,6Km/h and 9Km/h. The test can restore the test of the exercise center electrogram in daily life.
As can be seen from fig. 9, the electrocardiogram waveform is stable and the baseline is free from drift under all exercise actions, each wave band is completely displayed, and compared with the action that the arm swings up and down, more exercise artifacts can be generated, but the acquisition of the heart rate signals is not affected.
As can be seen from FIG. 10, as the speed increases, the motion artifact gradually increases, but the R-R stable heart rate is monitored to be stable even at a sprint speed of 9km/h. And meanwhile, the heart rate is compared with a POLAR heart rate belt, and the heart rate is acquired by the POLAR heart rate belt and the POLAR heart rate belt.
Example 2
Preparing a CNTT-pure cotton laminated fabric electrode, and then preparing an electrocardiographic tape by using the CNTT-pure cotton laminated fabric electrode.
The preparation method of the CNTT-pure cotton laminated fabric electrode of the embodiment is the same as that of the embodiment 1, and the difference is that: the carbon nanotube yarn of this example was twisted using 22 CNTF, and cotton was not used; the warp yarn of this embodiment is pure cotton.
Characteristics of CNTT-pure cotton laminate textile electrode: the impedance measured by the three-electrode method was 2.8Ω, and the electrode-skin impedance was 5×10 7 Omega. From this, it was found that the carbon nanotubes were free from water absorption, and that the electrode-skin resistance was reduced by using cotton threads having water absorption in contact with the skin.
Example 3
Preparing a CNTT-CNTT laminated fabric electrode, and then preparing an electrocardiographic tape by using the CNTT-CNTT laminated fabric electrode.
The preparation method of the CNTT-CNTT laminated fabric electrode of the embodiment is the same as that of the embodiment 1, and the difference is that: the warp yarn of this embodiment is carbon nanotube yarn (CNTT).
Characteristics of CNTT-CNTT laminated fabric electrode: the measured impedance was 11. Omega. And the electrode-skin impedance was 5.5X10 4 Omega. The surface of the carbon nano tube is smoother, the fabric electrode can not be fixed, and the influence of most peaks of the electrocardiogram is measured.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution, and the present invention is intended to be covered in the scope of the present invention.
Claims (10)
1. A preparation method of a flexible fabric electrocardio electrode is characterized by comprising the following steps: the method comprises the following steps:
s1, selecting carbon nanotube fibers as a base material, and twisting the carbon nanotube fibers by using a twisting machine to obtain carbon nanotube yarns, namely weft yarns;
s2, selecting warps, and weaving the warps and the wefts in a plain weave structure by taking the carbon nanotube yarns prepared in the step S1 as wefts to obtain a fabric electrode slice;
s3, assembling the fabric electrode sheet prepared in the step S2 with conductive sponge and stainless steel cloth, and after the assembly is completed, performing edge-locking fixation on the periphery by using carbon nanotube yarns to obtain a carbon nanotube laminated fabric electrode;
s4, sewing the carbon nano tube laminated fabric electrode prepared in the step S3 on the inner side of an elastic band, sewing a first hidden button connected with a sensor on the outer side of the elastic band, and leading out a second hidden button connected with a carbon nano tube yarn from the carbon nano tube laminated fabric, wherein the first hidden button is detachably connected with the second hidden button, and finally obtaining the electrocardio-band, namely the electrocardio-electrode of the flexible fabric.
2. The method for preparing the flexible fabric electrocardio-electrode according to claim 1, which is characterized in that: the weft yarn comprises 22 carbon nanotube fibers and 1 cotton thread after pretreatment.
3. The method for preparing the flexible fabric electrocardio-electrode according to claim 1, which is characterized in that: the carbon nanotube fibers are prepared by adopting a CVD method.
4. The method for preparing the flexible fabric electrocardio-electrode according to claim 1, which is characterized in that: the warp is pure cotton yarn, acrylic/cotton blended yarn, silk yarn, carbon nano tube yarn or polyester yarn.
5. The method for preparing the flexible fabric electrocardio-electrode according to claim 4, which is characterized in that: the warp is acrylic fiber/cotton blended yarn.
6. The method for preparing the flexible fabric electrocardio-electrode according to claim 4, which is characterized in that: the composite cotton thread consists of 66.3% cotton and 33.7% acrylic fiber.
7. The method for preparing the flexible fabric electrocardio-electrode according to claim 1, which is characterized in that: the contact area of the electrocardio-electrode of the flexible fabric is 7.07cm 2 。
8. The method for preparing the flexible fabric electrocardio-electrode according to claim 1, which is characterized in that: the two ends of the elastic band are connected through the magic tape.
9. A flexible fabric electrocardiographic electrode prepared by the method of any one of claims 1-8.
10. The flexible fabric electrocardio-electrode as claimed in claim 9 which is used for electrocardio-signal acquisition and electrocardiogram test.
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| CN202310243116.7A CN116421190A (en) | 2023-03-14 | 2023-03-14 | Flexible fabric electrocardio electrode and preparation method and application thereof |
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| CN202310243116.7A CN116421190A (en) | 2023-03-14 | 2023-03-14 | Flexible fabric electrocardio electrode and preparation method and application thereof |
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