CN112729387B - Performance quantitative evaluation method for wearable fabric electrode material - Google Patents
Performance quantitative evaluation method for wearable fabric electrode material Download PDFInfo
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- CN112729387B CN112729387B CN202011527222.0A CN202011527222A CN112729387B CN 112729387 B CN112729387 B CN 112729387B CN 202011527222 A CN202011527222 A CN 202011527222A CN 112729387 B CN112729387 B CN 112729387B
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Abstract
The invention discloses a method for evaluating the comprehensive performance of a wearable fabric electrode, which comprises the following steps: s1: testing the electrical property parameters and the material property parameters of the fabric material: in terms of electrical performance, electrode-skin impedance characteristics and phase characteristics were evaluated; in the aspect of the performance of the material, the fabric weaving structure, the washing tolerance and the flexibility are evaluated in combination with the wearable requirement; s2: establishing a scale, performing single-item scoring on each item of evaluation content, and distributing corresponding weight; s3: and carrying out comprehensive scoring according to the weight, and grading the fabric material according to the final score to realize the comprehensive evaluation of the performance of the fabric electrode material. The method starts from meeting the requirement of wearable medical development, provides reference basis for scientific research personnel to evaluate the performance of the fabric electrode material and screen out excellent fabric electrode materials.
Description
Technical Field
The invention relates to the field of wearable medical treatment, in particular to a method for quantitatively evaluating the performance of a wearable fabric electrode material.
Background
Along with the development of science and technology, more and more wearing formula equipment gets into people's the field of vision, has made things convenient for people's life greatly, and the small and exquisite convenient characteristics of wearing formula make the medical industry also develop towards the direction of wearing formula medical treatment. The wearable medical monitor analyzes the health condition of a patient in real time by collecting physiological signals on the surface of a human body, and provides a scientific and effective method for preventing and treating chronic diseases. Among them, the electrode is the collection end of the signal, has the crucial position.
The traditional AgCl/Ag wet electrode can not keep stable for a long time due to the state, the gel solidification is easy to occur after the traditional AgCl/Ag wet electrode is used for a period of time, the overall performance is greatly reduced, the wet electrode is adhered to a human body and is easy to cause discomfort, skin allergy can be caused seriously and even, and the requirement of wearable medical monitoring can not be met. In order to be able to continuously and stably acquire physiological signals, a suitable dry electrode must be found instead of a wet electrode.
The fabric electrode is a common dry electrode material, can well collect physiological signals and meets the requirement of wearing comfort, and the research heat of the fabric electrode is high. However, most of the research on the fabric electrode at home and abroad is limited to individual characteristics, comprehensive description of multiple parameters is lacked, and the selection of the fabric electrode material in the industry range at present is various, so that the most suitable fabric electrode material for manufacturing the electrode is lacked a unified and perfect evaluation standard.
Disclosure of Invention
The invention aims to provide a quantitative evaluation method for the performance of a wearable fabric electrode material, which aims to solve the problems in the prior art and promote the research process of the fabric electrode material.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a quantitative evaluation method for the performance of a wearable fabric electrode material, which comprises the following steps:
s1: testing or calculating a number of performance parameters of the fabric material;
s2: establishing a scale, calculating the individual score of each parameter, and distributing the weight of each parameter;
s3: calculating the comprehensive score of the fabric material and grading.
Further, the performance parameters in step S1 are classified into two types, i.e., electrical properties and material properties, wherein the electrical properties specifically include impedance and phase, and the material properties specifically include woven structure, washing resistance and flexibility.
Further, the evaluation condition of the programming structure is as follows: whether the air permeability is good or not, the air permeability of the woven fabric is relatively high: plain weave < twill < satin, and the whole air permeability of the knitted fabric is larger than that of the woven fabric.
Further, the method for detecting the washing tolerance comprises the following steps: the fabric is washed for a plurality of times, and the maximum washing time which can maintain the electrical property basically unchanged is found.
Further, the impedance and phase calculation method adopts a Pearson similarity calculation method to calculate.
Further, the calculation method or the standard for calculating the singleton score of each parameter in the step S2 is as follows:
impedance:
phase position:
weaving a structure: plain weaving: 75 minutes, twill: 80 minutes, satin: 85 min, knitted fabric: 90 minutes;
washing tolerance: 1 to 5 times: 75 minutes, 6 times to 10 times: 80 min, 11 times to 15 times: 85 minutes, more than 15 times: 90 minutes;
flexibility: m < 10: 90 minutes, m is more than or equal to 10 and less than 50: 85 minutes, m is more than or equal to 50 and less than 100: 80 minutes, m is more than or equal to 100 and less than 200: 75 minutes, m is more than or equal to 200 and less than 500: 70 minutes, m is more than or equal to 500: 65 minutes;
wherein
Is Pearson's similarity ρX，YAnd solving the third power to enlarge the difference of results, wherein the range is 0-1, m is the average bending rigidity, and the flexibility characteristic of the fabric can be represented.
Further, the basis of the weight assignment in step S2 is: the electrical property requirement and the wearing requirement of the fabric electrode material are comprehensively considered for distribution; the result of the weight assignment is:
impedance 0.3, phase 0.3, weave structure 0.1, wash tolerance 0.2, flexibility 0.1.
Further, the method for calculating the comprehensive score of the fabric material in the step S3 includes:
carrying out weighted average on the individual fraction of the fabric electrode material to obtain a final score, wherein the specific calculation formula is as follows:
wherein S is the final composite score of the fabric, SiFor the score of the ith performance parameter of the fabric,
the weight of the ith performance parameter of the fabric.
The invention discloses the following technical effects:
1. the method combines the requirements of the wearable fabric dry electrode, comprehensively evaluates the electrical properties of the electrode material and the material properties of the material, and is beneficial to more scientifically and comprehensively evaluating the overall characteristics of the fabric electrode material.
2. The method provides a scale method for evaluating the overall characteristics of the fabric electrode material, designs a single-term score calculation method for each evaluation factor, and calculates an overall score and grades by using a weighted average method.
3. The method makes up the problem that the evaluation mode of the fabric electrode material in the current research is not uniform and incomplete, can be used as a reference basis for screening the fabric electrode material, and has a certain value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flow chart of a method for evaluating the performance of a wearable fabric electrode.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
The "parts" in the present invention are all parts by mass unless otherwise specified.
A method for evaluating the performance of a wearable fabric electrode, comprising the following steps, as shown in fig. 1:
step S1: the method is characterized in that various performance parameters (impedance, phase, weaving structure, washing tolerance and flexibility) of the fabric material are tested, the impedance characteristic and the phase characteristic are mainly used for investigating the impedance spectrum and the phase spectrum similarity of a skin-electrode system formed by attaching an electrode to a human body and a medical AgCl/Ag electrode in a frequency band of 0.1Hz-20kHz, the impedance spectrum and the phase spectrum similarity are calculated by adopting a Pearson similarity meter algorithm, and the Pearson similarity calculation formula is as follows:
for two variables X (X)1，x2，x3，…)，Y(y1，y2y3…), the degree of similarity ρ between X and YX，YComprises the following steps:
where cov is the covariance, σ is the sample standard deviation, and E is the mathematical expectation.
The woven structure considers the weaving mode of the fabric, which mainly affects the air permeability of the fabric, and the air permeability of the woven fabric is considered to be compared: plain weave < twill < satin, while the air permeability of the knitted fabric is overall greater than that of woven fabric. In consideration of the requirement on wearing comfort, the weaving density of the fabric electrode material tightly attached to the human body is not high.
The washing tolerance considers the stability degree of each performance of the fabric after washing. By referring to ISO6330-2012 textile-test home wash and dry procedure, fabrics are washed multiple times, finding the maximum number of washes that can maintain electrical properties substantially unchanged.
The flexibility of the fabric is considered, the fabric with good flexibility is more easily attached to a human body, and the contact area between the electrode and the human body is increased. The fabric is tested by a fabric stiffness tester conforming to the GB/T18318 standard.
The conductive fabrics used in the test were: RCN, RS, SCN, PCN, TNES, TKES, and has the following specific meanings in Table 2.
The impedance and phase test utilizes an impedance tester to perform frequency sweep measurement on a sample to be tested fixed on the skin within the frequency range of 0.1Hz-2kHz, the test result of a medical AgCl/Ag wet electrode is taken as a reference, the Pearson similarity is calculated, and the calculation result is shown in Table 1:
TABLE 1
| Conductive fabric | Impedance (L) | Phase position |
| RCN | 0.9999 | 0.9800 |
| RS | 0.9999 | 0.9313 |
| SCN | 0.9996 | 0.9929 |
| PCN | 0.9998 | 0.9831 |
| TNES | 0.9986 | 0.9522 |
| TKES | 0.9979 | 0.9348 |
The weave structure of each fabric was observed and the results are shown in table 2:
TABLE 2
By referring to ISO6330-2012 textile test home wash and dry procedure, the fabrics were washed several times to find the maximum number of tolerations that maintained the electrical properties substantially unchanged, the results are given in table 3:
TABLE 3
| Conductive fabric | Maximum number of wash-fastness |
| RCN | 5 |
| RS | 8 |
| SCN | 7 |
| PCN | 5 |
| TNES | >15 |
| TKES | >15 |
The fabric flexibility was tested using a fabric stiffness tester with results as given in table 4:
TABLE 4
Step S2: establishing a scale, and calculating the individual score of each parameter;
performing single fraction judgment on the performances, then comprehensively considering the electrical performance requirement and the wearable requirement of the fabric electrode material, and distributing the weight, specifically as follows:
the following table 5 (evaluation scale) was established:
TABLE 5
Where ρ isX，YThe calculation result of the Pearson similarity is in a range of 0-1, the third power is obtained during calculation to enlarge the difference of the result, and m is the average bending rigidity and can represent the flexibility characteristic of the fabric.
The individual scores obtained for each web material are shown in Table 6:
TABLE 6
| Conductive fabric | Impedance (L) | Phase position | Woven structure | Wash tolerance | Flexibility |
| RCN | 100.0 | 94.1 | 85 | 75 | 75 |
| RS | 100.0 | 80.8 | 85 | 80 | 85 |
| SCN | 99.9 | 97.9 | 75 | 80 | 70 |
| PCN | 99.9 | 95.0 | 75 | 75 | 70 |
| TNES | 99.6 | 86.3 | 90 | 90 | 85 |
| TKES | 99.4 | 81.7 | 90 | 90 | 90 |
Step S3: calculating the comprehensive score of the fabric material by considering the weight;
and carrying out weighted average on the individual fractions of the fabric electrode material to obtain a final score (S), wherein the specific calculation formula is as follows:
wherein S is the final composite score of the fabric, SiFor the score of the ith performance parameter of the fabric,
the weight of the ith performance parameter of the fabric.
The fabric electrode material was weighted and averaged according to the final score, and the final score was obtained by ranking the different grades, with the results shown in table 7:
TABLE 7
| Conductive fabric | Final score | Grade |
| RCN | 89.2 | Second stage |
| RS | 87.2 | Second stage |
| SCN | 89.8 | Second stage |
| PCN | 88.0 | Second stage |
| TNES | 91.3 | First stage |
| TKES | 90.3 | First stage |
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. A method for evaluating the comprehensive performance of a wearable fabric electrode is characterized by comprising the following steps: the method comprises the following steps:
s1: testing or calculating a plurality of performance parameters of the fabric electrode material, wherein the performance parameters are divided into two types of electrical performance and material performance, the electrical performance specifically comprises impedance and phase, and the material performance specifically comprises a woven structure, washing tolerance and flexibility;
s2: establishing a scale, calculating the individual score of each parameter, and distributing the weight of each parameter, wherein the calculation method or standard for calculating the individual score of each parameter is as follows:
impedance:
phase position:
and (3) weaving structure: plain weaving: 75 minutes, twill: 80 minutes, satin: 85 min, knitted fabric: 90 minutes;
washing tolerance: 1 to 5 times: 75 minutes, 6 times to 10 times: the content of the mixture is 80 minutes,
11 times to 15 times: 85 minutes, more than 15 times: 90 minutes;
flexibility: m < 10: 90 minutes, m is more than or equal to 10 and less than 50: 85 minutes, m is more than or equal to 50 and less than 100: the content of the mixture is 80 minutes,
m is more than or equal to 100 and less than 200: 75 minutes, m is more than or equal to 200 and less than 500: 70 minutes, m is more than or equal to 500: 65 minutes;
the impedance and the phase are mainly considered to be the similarity of the impedance spectrum and the phase spectrum of a skin-electrode system formed by attaching an electrode to a human body and a medical AgCl/Ag electrode in a frequency range of 0.1Hz to 20kHz and are calculated by adopting a Pearson similarity meter algorithm, wherein
Is Pearson's similarity ρX,YThe third power of the average bending stiffness is 0-1, X is a frequency sweeping measurement result of the to-be-measured fabric electrode material, Y is a test result of the medical AgCl/Ag wet electrode, and m is the average bending stiffness and can represent the fabric flexibility characteristic;
s3: and calculating the comprehensive score of the fabric electrode material and grading.
2. The method for evaluating the comprehensive performance of the wearable fabric electrode as claimed in claim 1, wherein: the judgment conditions of the weaving structure are as follows: whether the air permeability is good or not, the air permeability of the woven fabric is relatively high: plain weave < twill < satin weave, the air permeability of the knitted fabric is integrally greater than that of the woven fabric.
3. The method for evaluating the comprehensive performance of the wearable fabric electrode as claimed in claim 1, wherein: the method for detecting the washing tolerance comprises the following steps: the fabric is washed for a plurality of times, and the maximum washing time which can maintain the electrical property basically unchanged is found.
4. The method for evaluating the comprehensive performance of the wearable fabric electrode as claimed in claim 1, wherein: the basis of the weight assignment in step S2 is: the electrical property requirement and the wearing requirement of the fabric electrode material are comprehensively considered for distribution; the result of the weight assignment is:
impedance 0.3, phase 0.3, weave structure 0.1, wash tolerance 0.2, flexibility 0.1.
5. The method for evaluating the comprehensive performance of the wearable fabric electrode as claimed in claim 1, wherein: the method for calculating the comprehensive score of the fabric electrode material in the step S3 comprises the following steps:
carrying out weighted average on the individual scores of the fabric electrode material to obtain a comprehensive score, wherein the specific calculation formula is as follows:
wherein S is the composite score of the fabric, SiFor the score of the ith performance parameter of the fabric,
the weight of the ith performance parameter of the fabric.
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