A flexible bioelectric dry electrode and its preparation method and application

Abstract

This invention discloses a flexible bioelectric dry electrode, its preparation method, and its applications. The flexible bioelectric dry electrode comprises chopped silver-plated fiber felt and an organosilicon-organosilicon gel mixture filling the gaps within the chopped silver-plated fiber felt. The chopped silver-plated fiber felt is composed of several interlaced chopped silver-plated fibers. The flexible bioelectric dry electrode also has several through holes. The flexible bioelectric dry electrode of this invention has advantages such as stable dynamic contact impedance, good skin adhesion, good breathability, and reusability. Furthermore, it is simple to prepare and can be applied in the detection of bioelectrical signals such as electrocardiogram, electromyography, and electrodermal activity.

Description

Technical Field

[0001] The present invention relates to the technical field of bioelectric dry electrodes, and in particular to a flexible bioelectric dry electrode and a preparation method and application thereof. Background Art

[0002] Bioelectric signals are extremely important physiological signals of the human body, and are often detected using contact electrodes (contact detection). The performance of the contact electrodes is directly related to the quality of the detected signals. At present, the bioelectric electrodes used in wearable devices are mainly dry electrodes, but the common dry electrodes have poor adhesion and the contact impedance changes greatly under the user's dynamic environment, resulting in poor detection signal quality, which is difficult to fully meet the actual application needs.

[0003] Therefore, it is of great significance to develop a flexible bioelectric dry electrode with relatively stable dynamic contact impedance, good skin adhesion, good air permeability, and reusability. Summary of the invention

[0004] The purpose of the present invention is to provide a flexible bioelectric dry electrode and a preparation method and application thereof.

[0005] The technical solution adopted by the present invention is:

[0006] A flexible bioelectric dry electrode comprises short-cut silver-plated fiber felt and an organic silica gel-organic silica gel mixture filled in the internal gap of the short-cut silver-plated fiber felt; the short-cut silver-plated fiber felt is composed of a plurality of short-cut silver-plated fibers interlaced; the flexible bioelectric dry electrode is also provided with a plurality of through holes.

[0007] Preferably, the length of the chopped silver-plated fibers is 2 mm to 5 mm.

[0008] Further preferably, the chopped silver-plated fibers are compounded from chopped silver-plated fibers having lengths of 2 mm, 3 mm, 4 mm and 5 mm.

[0009] Preferably, the chopped silver-plated fibers are at least one of chopped silver-plated spandex fibers and chopped silver-plated nylon fibers.

[0010] The flexible bioelectric dry electrode of the present invention can be attached to a non-conductive substrate with a single lead as an independent dry electrode, or can be attached to a dry conductive substrate to form a composite dry electrode.

[0011] The method for preparing the above-mentioned flexible bioelectric dry electrode comprises the following steps:

[0012] 1) Dispersing the short-cut silver-plated fibers in ethanol, filtering, transferring the filter cake to a substrate, drying, and pressing to obtain a short-cut silver-plated fiber felt;

[0013] 2) Mixing the addition type organic silica gel and the addition type organic silicone gel to form a mixed glue, and then dripping it on the short-cut silver-coated fiber felt. After the mixed glue is completely infiltrated, it is heated to cure, and then the obtained glue-coated felt is peeled off from the substrate and punched with a puncher or a laser to obtain a flexible bioelectric dry electrode.

[0014] Preferably, the pressing in step 1) is carried out at a pressure of 0.08 MPa to 0.18 MPa, and the holding time is 40 s to 80 s.

[0015] Preferably, the mixed glue in step 2) consists of the following components in percentage by mass:

[0016] Addition type organic silica gel: 20% to 30%;

[0017] Addition type silicone gel: 70%~80%.

[0018] Preferably, the addition-type organic silica gel in step 2) is the addition-type organic silica gel Ecoflex 00-30 produced by Smooth-On Company of the United States.

[0019] Preferably, the addition-type organosilicon gel in step 2) is medical addition-type organosilicon gel XY-8060 produced by Shenzhen Youlisheng Technology Co., Ltd.

[0020] Preferably, the curing in step 2) is carried out at 50° C. to 70° C., and the curing time is 40 min to 80 min.

[0021] A bioelectric detection device comprises the above-mentioned flexible bioelectric dry electrode.

[0022] A wearable device comprises the above-mentioned bioelectric detection device.

[0023] The beneficial effects of the present invention are as follows: the flexible bioelectric dry electrode of the present invention has the advantages of relatively stable dynamic contact impedance, good skin adhesion, good air permeability, and reusability, and is simple to prepare, and can be applied in the field of bioelectric signal detection such as electrocardiogram, electromyography, and skin electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the cross-section structure of the flexible bioelectric dry electrode in Example 1.

[0025] Figure 2 This is a physical photo of the flexible bioelectric dry electrode in Example 1.

[0026] Figure 3 This is a schematic diagram of the structure of the composite silver-plated fabric electrode in Example 1.

[0027] Figure 4The graph shows the anti-peeling test and anti-slip test results of the flexible bioelectric dry electrode in Example 1.

[0028] Figure 5 This is the impedance spectrum of the flexible bioelectric dry electrode in Example 1.

[0029] Figure 6 Chest ECG signals obtained for people wearing commercial ECG clothing and improved commercial ECG clothing.

[0030] Description of the accompanying drawings: 10, short-cut silver-plated fiber felt; 20, organic silica gel-organic silicone gel mixture; 30, through hole; 100, silver-plated fiber fabric substrate; 200, flexible bioelectric dry electrode. DETAILED DESCRIPTION

[0031] The present invention will be further explained and illustrated below in conjunction with specific embodiments.

[0032] Embodiment 1:

[0033] A flexible bioelectric dry electrode (sectional structural diagram as shown in FIG. Figure 1 As shown), it comprises a chopped silver-plated fiber felt 10 and an organic silica gel-organic silica gel mixture 20 filled in the internal gap of the chopped silver-plated fiber felt 10; the chopped silver-plated fiber felt 10 is composed of a plurality of chopped silver-plated fibers interlaced; and the flexible bioelectric dry electrode is also provided with a plurality of through holes 30.

[0034] The method for preparing the above-mentioned flexible bioelectric dry electrode comprises the following steps:

[0035] 1) 280D silver-plated spandex sewing threads with lengths of 2 mm, 3 mm, 4 mm and 5 mm were ultrasonically dispersed in ethanol respectively, and then washed and dried to obtain short-cut silver-plated spandex fibers (monofilaments) of four different lengths;

[0036] 2) 0.005 g of each of the four short-cut silver-plated spandex fibers of different lengths obtained in step 1) was ultrasonically dispersed in ethanol, and then filtered, the filter cake was transferred to a substrate, and then dried and pressed at a pressure of 0.0882 MPa for 60 seconds to obtain short-cut silver-plated fiber felt (round, with a diameter of 38 mm);

[0037] 3) The addition-type organic silicone Ecoflex00-30 of Smooth-On Company of the United States and the medical addition-type organic silicone gel XY-8060 of Shenzhen Youlisheng Technology Co., Ltd. were mixed evenly in a mass ratio of 3:7 to form a mixed glue, and then evenly added to the surface of the short-cut silver-coated fiber felt until the entire felt surface was just soaked. After the mixed glue was completely infiltrated, it was heated to 60°C and cured for 1 hour. Then, a microneedle roller was used to roll on the obtained coated felt surface to obtain a flexible bioelectric dry electrode (actual photo as shown in the figure) Figure 2shown).

[0038] A composite silver-plated fabric electrode (schematic diagram as shown in Figure 3 As shown), it comprises a circular silver-plated fiber fabric substrate 100 and a ring-shaped flexible bioelectric dry electrode 200 (cut from the flexible bioelectric dry electrode prepared in this embodiment) bonded to the surface of the silver-plated fiber fabric substrate 100.

[0039] Performance Test:

[0040] 1) The flexible bioelectric dry electrode of this embodiment was cut and subjected to anti-peeling test and anti-slip test (before the test, the test sample was first pressurized with a 10g weight for 1 minute. During the anti-slip test, the suspended tensile section of the test sample broke, and the working section was still attached to the test plane). The test results are as follows: Figure 4 (a is a schematic diagram of the anti-peeling test process, b is the anti-peeling force curve, c is a schematic diagram of the anti-slipping test process, and d is the anti-slipping force curve).

[0041] Depend on Figure 4 It can be seen that the flexible bioelectric dry electrode of this embodiment has a certain viscosity, and its adhesive surface can resist a certain shear slip and peeling movement. The electrode can maintain good contact stability with the skin in actual use (for example: under a certain pressure applied by smart tights).

[0042] 2) After the flexible bioelectric dry electrode of this embodiment is cut (the size is 10mm×10mm, the thickness is 300μm, 0.098N pressure is applied, and smooth copper foil is used as the crimping lead), an impedance test is performed. The impedance spectrum obtained by the test is as follows: Figure 5 shown.

[0043] Depend on Figure 5 It can be seen that the intrinsic impedance of the flexible bioelectric dry electrode of this embodiment is relatively small, and it is mainly a resistive element with low capacitive effect.

[0044] 3) The chest ECG signals obtained by wearing a commercial ECG clothing (AMSU Amu ECG clothing smart sports ECG clothing smart running clothing, the electrodes are the original silver-plated fiber fabric electrodes) and the improved commercial ECG clothing (the electrodes are replaced with the composite silver-plated fabric electrodes of this embodiment) are shown in the figure below: Figure 6 (a is the original silver-plated fiber fabric electrode in the commercial electrocardiograph clothing, b is a static electrocardiograph obtained while wearing the commercial electrocardiograph clothing, c is an electrocardiograph in the running state obtained while wearing the commercial electrocardiograph clothing, d is the composite silver-plated fabric electrode in the improved commercial electrocardiograph clothing, e is a static electrocardiograph obtained while wearing the improved commercial electrocardiograph clothing, and f is an electrocardiograph in the running state obtained while wearing the improved electrocardiograph clothing) as shown (no sweat or external moisture remains on the skin during the test state).

[0045] Depend on Figure 6It can be seen that: the ECG signals obtained when wearing commercial ECG clothes (the electrodes are the original silver-plated fiber fabric electrodes) with dry skin have certain interference, but the software algorithm can still handle it well, and the ECG signals obtained when wearing improved commercial ECG clothes (the electrodes are the composite silver-plated fabric electrodes of this embodiment) have lower interference and the waveform quality is significantly improved; the ECG signals obtained when wearing commercial ECG clothes (the electrodes are the original silver-plated fiber fabric electrodes) while running and with dry skin are messy and have no characteristic peaks, while the ECG signals obtained when wearing improved commercial ECG clothes (the electrodes are the composite silver-plated fabric electrodes of this embodiment) can clearly see the R peak of the ECG signals.

[0046] Embodiment 2:

[0047] A flexible bioelectric dry electrode (sectional structural diagram as shown in FIG. Figure 1 As shown), it comprises a chopped silver-plated fiber felt 10 and an organic silica gel-organic silica gel mixture 20 filled in the internal gap of the chopped silver-plated fiber felt 10; the chopped silver-plated fiber felt 10 is composed of a plurality of chopped silver-plated fibers interlaced; and the flexible bioelectric dry electrode is also provided with a plurality of through holes 30.

[0048] The method for preparing the above-mentioned flexible bioelectric dry electrode comprises the following steps:

[0049] 1) 280D silver-plated spandex sewing threads with lengths of 2 mm, 3 mm, 4 mm and 5 mm were ultrasonically dispersed in ethanol respectively, and then washed and dried to obtain short-cut silver-plated spandex fibers (monofilaments) of four different lengths;

[0050] 2) 0.0075 g of each of the four short-cut silver-plated spandex fibers of different lengths obtained in step 1) was ultrasonically dispersed in ethanol, and then filtered, the filter cake was transferred to a substrate, and then dried and pressed at a pressure of 0.0882 MPa for 60 seconds to obtain short-cut silver-plated fiber felt (round, with a diameter of 38 mm);

[0051] 3) The addition-type organic silicone Ecoflex00-30 produced by Smooth-On Company of the United States and the medical addition-type organic silicone gel XY-8060 produced by Shenzhen Youlisheng Technology Co., Ltd. were mixed evenly in a mass ratio of 2:8 to form a mixed glue, and then evenly added to the surface of the short-cut silver-coated fiber felt until the entire felt surface was just soaked. After the mixed glue was completely infiltrated, it was heated to 60°C and cured for 1 hour. Then a microneedle roller was used to roll the obtained coated felt surface to obtain a flexible bioelectric dry electrode.

[0052] According to tests, as the filling mass of chopped silver-plated fibers increases, the thickness and strength of the obtained flexible bioelectric dry electrode increase. As the proportion of medical addition-type silicone gel XY-8060 in the mixed glue increases, the adhesion of the obtained flexible bioelectric dry electrode increases, but the strength decreases (addition-type silicone gel Ecoflex00-30 acts as a mechanical strength enhancer, and medical addition-type silicone gel XY-8060 acts as an adhesion provider).

[0053] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A flexible bioelectric dry electrode, characterized in that: It is composed of short-cut silver-plated fiber felt and a mixture of organic silica gel-organic silicone gel filled in the internal gap of the short-cut silver-plated fiber felt; the short-cut silver-plated fiber felt is composed of a plurality of short-cut silver-plated fibers interlaced; the length of the short-cut silver-plated fibers is 2 mm to 5 mm; the short-cut silver-plated fibers are at least one of short-cut silver-plated spandex fibers and short-cut silver-plated nylon fibers; the flexible bioelectric dry electrode is also provided with a plurality of through holes.

2. The flexible bioelectric dry electrode according to claim 1, characterized in that: The short-cut silver-plated fibers are compounded by short-cut silver-plated fibers with lengths of 2 mm, 3 mm, 4 mm and 5 mm.

3. The method for preparing the flexible bioelectric dry electrode according to claim 1 or 2, characterized in that: The following steps are involved: 1) Dispersing the short-cut silver-plated fibers in ethanol, filtering, transferring the filter cake to a substrate, drying, and pressing to obtain a short-cut silver-plated fiber felt; 2) Mixing the addition type organic silica gel and the addition type organic silicone gel to form a mixed glue, and then dripping it on the short-cut silver-coated fiber felt. After the mixed glue is completely infiltrated, it is heated to cure, and then the obtained glue-coated felt is peeled off from the substrate and punched with a puncher or a laser to obtain a flexible bioelectric dry electrode.

4. The method for preparing the flexible bioelectric dry electrode according to claim 3, characterized in that: Step 1) The pressing is carried out under a pressure of 0.08 MPa to 0.18 MPa, and the holding time is 40 s to 80 s.

5. The method for preparing the flexible bioelectric dry electrode according to claim 3 or 4, characterized in that: Step 2) The mixed glue is composed of the following components in percentage by mass: Addition type organic silica gel: 20% to 30%; Addition type silicone gel: 70%~80%.

6. The method for preparing the flexible bioelectric dry electrode according to claim 3 or 4, characterized in that: Step 2) The curing is carried out at 50°C to 70°C, and the curing time is 40min to 80min.

7. A bioelectric detection device, characterized in that: The composition includes the flexible bioelectric dry electrode described in claim 1 or 2.

8. A wearable device, characterized in that: The composition includes the bioelectric detection device described in claim 7.

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