A flexible electronic wristband and its suction cup-type conductive hydrogel electrode integration method

Abstract

This invention discloses a flexible electronic wristband and its suction cup-type conductive hydrogel electrode integration method, addressing the current problems of low reliability in underwater data acquisition, inconvenient acquisition location, and uncomfortable wear. The suction cup-type conductive hydrogel electrode of this invention's flexible electronic wristband exhibits strong adhesion and good conductivity when in contact with the human skin surface to acquire muscle electromyography (EMG) signals, significantly improving the quality of the acquired signals. When used underwater, the unique suction cup structure adheres tightly to the skin based on the principle of vacuum adsorption, preventing water ingress from affecting the functional circuitry and weak EMG signals, thus improving the reliability of the device. Furthermore, the conductive hydrogel absorbs absorbed moisture and human sweat, enhancing the vacuum adsorption effect and further improving waterproof performance. The flexible electronic wristband is worn on the wrist, and its protective shell and functional circuitry are made of flexible materials, offering advantages such as comfortable wear and convenient data acquisition.

Description

Technical Field

[0001] This invention belongs to the field of biomedical electrotechnology, specifically relating to a flexible electronic wristband and its suction cup-type conductive hydrogel electrode integration method. Background Technology

[0002] In recent years, electromyography (EMG) signal acquisition technology has played a crucial role in fields such as human-computer interaction and physiological state monitoring. By using EMG electrodes to collect electrical signals from muscles on the human body surface, and analyzing and extracting time-domain and frequency-domain features, it can be used to identify human movements and physiological state indicators. With the development of wearable technology, for applications such as gesture interaction and muscle fatigue monitoring, and targeting user groups such as divers and swimmers, the development of devices that can be comfortably worn underwater and conveniently collect EMG signals has promising prospects and a broad market.

[0003] A search of existing technologies revealed that very few of the patents related to electromyography (EMG) signal acquisition devices are applicable to underwater scenarios.

[0004] CN106419870A discloses a smart waistband for monitoring physiological information during swimming. It uses electromyography (EMG) sensors to monitor the swimmer's muscle condition. It has a wide range of applications, enabling monitoring both indoor and outdoor swimming. However, the EMG electrodes of this device are in direct contact with the skin and are not designed to be waterproof. In actual use, the electrodes and the submerged skin surface will generate significant signal interference, making it difficult to effectively collect EMG information. Furthermore, the EMG collection location is on the waist, making it inconvenient to wear.

[0005] CN209048136U discloses an adhesive wireless multi-channel ultra-thin nanoneedle electrode electromyography (EMG) acquisition device. The acquisition module is waterproofed to avoid the impact of human sweat on acquisition accuracy during the acquisition process, and it can also acquire EMG data underwater. However, this acquisition device adheres to the skin surface via an adhesive layer, neglecting the impact of water immersion on adhesion, and therefore cannot perform prolonged underwater acquisition.

[0006] CN109998540B discloses a waterproof portable bioelectric signal acquisition system that enables long-term acquisition and storage of bioelectric signals in underwater environments. It can perform multi-channel EEG and EMG acquisition, and the system is lightweight, safe, low-power, and has a certain degree of pressure resistance. However, because its equipment compartment is made of a relatively hard engineering plastic alloy (PC+ABS), the device is bulky and has low wearing comfort.

[0007] CN215605756U discloses a smart bracelet electromyography (EMG) signal acquisition device. Users can set a contraction mechanism to contract and relax the wristband, which is then secured. The overall structure is simple and easy to wear. A protective mechanism prevents internal components from getting wet and causing short circuits during exercise or rain. However, the waterproof capability of this protective mechanism is limited and it cannot maintain good waterproof performance underwater.

[0008] In summary, to improve the reliability of underwater electromyography (EMG) signal acquisition while ensuring comfort and convenience, there is an urgent need to develop novel flexible electronic wristbands for underwater wrist EMG acquisition. On one hand, by designing integrated suction cup-type conductive hydrogel electrodes, dual protection is achieved, effectively improving the waterproof performance of the acquisition electrodes and enabling long-term stable underwater EMG signal acquisition. On the other hand, a flexible outer shell and flexible circuit design for wrist wear enhance wearing comfort and conform to human usage habits. Summary of the Invention

[0009] To overcome the shortcomings of existing technologies, this invention provides a flexible electronic wristband and its suction cup-type conductive hydrogel electrode integration method, addressing problems such as low reliability of underwater data acquisition, inconvenient acquisition location, and uncomfortable wear. The suction cup-type conductive hydrogel electrode of this invention's flexible electronic wristband exhibits strong adhesion and good conductivity when in contact with the human skin surface to acquire muscle electromyography (EMG) signals, significantly improving the quality of the acquired signals. When used underwater, the unique suction cup structure adheres tightly to the skin based on the principle of vacuum adsorption, preventing water ingress from affecting the functional circuitry and weak EMG signals, thus improving the reliability of the device. Furthermore, the conductive hydrogel absorbs absorbed moisture and human sweat, enhancing the vacuum adsorption effect and further improving waterproof performance. The flexible electronic wristband is worn on the wrist, and its protective shell and functional circuitry are made of flexible materials, offering advantages such as comfortable wear and convenient data acquisition.

[0010] The technical solution adopted by this invention to solve its technical problem includes the following steps:

[0011] A flexible electronic wristband includes multiple suction cup-type conductive hydrogel electrodes, functional circuitry, and a protective shell.

[0012] The functional circuit is used for electromyography signal acquisition and processing; the functional circuit is placed inside the protective shell; the bottom surface of the functional circuit is provided with multiple solder pads, the number of which is the same as that of the suction cup conductive hydrogel electrode.

[0013] The suction cup conductive hydrogel electrode includes a suction cup and a solid conductive hydrogel; the suction cup is made of silicone material, with the upper part being a hollow cylindrical structure and the lower part being a trapezoidal rotating suction cup structure; the solid conductive hydrogel is obtained by curing liquid conductive hydrogel and fills the hollow cylindrical structure of the suction cup.

[0014] The bottom surface of the protective shell is provided with a plurality of circular through holes, the number of which is the same as the number of suction cup conductive hydrogel electrodes; the suction cup conductive hydrogel electrodes are placed on the bottom surface of the protective shell, and the hollow cylindrical structure of the suction cup is placed in the through holes in a sealed adhesive manner, and the solid conductive hydrogel is in direct contact with the pads, and is bonded by the adhesive of the solid conductive hydrogel 102.

[0015] The flexible electronic wristband is worn on the wrist and comes into contact with the skin to collect electromyographic signals.

[0016] Preferably, the solid conductive hydrogel is doped with conductive nanomaterials, and the conductive nanomaterials are one of gold nanoparticles, silver nanoparticles, gold nanowires, silver nanowires, and carbon nanotubes.

[0017] Preferably, the substrate material of the functional circuit is a flexible material, which is polyimide (PI) or polyethylene terephthalate (PET).

[0018] Preferably, the protective shell is made of flexible, skin-friendly silicone material.

[0019] Preferably, the outer diameter of the hollow cylindrical structure is smaller than that of the circular through hole.

[0020] A method for preparing a suction cup-type conductive hydrogel electrode includes the following steps:

[0021] Step 1: Prepare auxiliary preparation tools: release paper, sleeve, push rod;

[0022] Step 2: Place the release paper at the bottom of the sleeve and use a syringe to inject the liquid conductive hydrogel into the inside of the sleeve;

[0023] Step 3: Heat the sleeve at a constant temperature of 50℃~100℃ for 3~5 hours to transform the liquid conductive hydrogel into a solid conductive hydrogel.

[0024] Step 4: Insert the suction cup into the circular through hole and fix it to the bottom of the protective shell by adhesive.

[0025] Step 5: Invert the sleeve and place it inside the suction cup. Remove the release paper, insert the push rod into the sleeve, press down the push rod to push the solid conductive hydrogel into close contact with the pad, and then pull up the sleeve to place the solid conductive hydrogel inside the suction cup in an interference fit.

[0026] Step 6: Repeat steps 1-5 until all suction cup conductive hydrogel electrodes are installed.

[0027] Preferably, in step 3, the sleeve is heated at a constant temperature of 70°C for 4 hours.

[0028] Preferably, the release paper is a smooth, circular sheet of paper.

[0029] Preferably, the sleeve is a hollow cylinder made of glass.

[0030] Preferably, the push rod is made of glass material, with a cylindrical upper part and a circular thin sheet lower part.

[0031] The beneficial effects of this invention are as follows:

[0032] 1. High reliability for underwater data acquisition. The suction cup-type conductive hydrogel electrode collects muscle electrical signals by contacting the surface of human skin. Its strong adhesion and excellent conductivity improve the quality of the acquired signals. When used underwater, the unique suction cup structure adheres tightly to the skin based on the principle of vacuum adsorption, preventing water ingress from affecting the functional circuitry and weak electromyographic signals, thus improving the reliability of the device. Simultaneously, the conductive hydrogel absorbs absorbed water, further enhancing its waterproof performance.

[0033] 2. Comfortable and convenient to wear. The flexible electronic wristband is worn on the wrist, and its protective shell and functional circuits are made of flexible materials, which improves wearing comfort and conforms to human usage habits. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural schematic diagram of the flexible electronic wristband of the present invention.

[0035] Figure 2 This is a schematic diagram of the integration steps of the suction cup-type conductive hydrogel electrode of the present invention.

[0036] Figure 3 This is a schematic diagram illustrating the waterproof working principle of the suction cup-type conductive hydrogel electrode of the present invention.

[0037] Figure 4 This is a schematic diagram of the integration steps of the suction cup conductive hydrogel electrode in Embodiment 2 of the present invention.

[0038] Figure 5 This is a schematic diagram of the integration steps of the suction cup conductive hydrogel electrode in Embodiment 3 of the present invention.

[0039] In the diagram, 1-suction cup conductive hydrogel electrode; 101-suction cup; 102-solid conductive hydrogel; 2-functional circuit; 3-soldering pad; 4-protective shell; 5-through hole; 6-human wrist area; 7-release paper; 8-sleeve; 9-push rod. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] The main objective of this invention is to overcome the problems existing in the background art and provide a flexible electronic wristband and a suction cup-type hydrogel electrode integration method. This invention has the advantages of comfortable wear and high reliability in underwater electromyography (EMG) acquisition, and can be applied to fields such as natural underwater gesture interaction and muscle fatigue monitoring.

[0042] A flexible electronic wristband includes multiple suction cup conductive hydrogel electrodes 1, a functional circuit 2, and a protective shell 4;

[0043] The functional circuit 2 is used for electromyography signal acquisition and processing; the functional circuit 2 is placed inside the protective shell 4; the bottom surface of the functional circuit 2 is provided with multiple solder pads 3, the number of which is the same as that of the suction cup conductive hydrogel electrode 1.

[0044] The suction cup type conductive hydrogel electrode 1 includes a suction cup 101 and a solid conductive hydrogel 102; the suction cup 101 is made of silicone material, the upper part is a hollow cylindrical structure, and the lower part is a trapezoidal rotating suction cup structure; the solid conductive hydrogel 102 is obtained by curing liquid conductive hydrogel, and the solid conductive hydrogel 102 fills the hollow cylindrical structure of the suction cup 101.

[0045] The bottom surface of the protective shell 4 is provided with a plurality of circular through holes 5, the number of which is the same as the number of suction cup conductive hydrogel electrodes 1; the suction cup conductive hydrogel electrodes 1 are placed on the bottom surface of the protective shell 4, the hollow cylindrical structure of the suction cup 101 is placed in the through hole 5 in a sealed adhesive manner, and the solid conductive hydrogel 102 is in direct contact with the pad 3, and is bonded by the adhesive of the solid conductive hydrogel 102.

[0046] When in operation, the flexible electronic wristband is worn on the wrist 6 of the human body and comes into contact with the surface of the human skin to collect electromyographic signals.

[0047] Preferably, the solid conductive hydrogel 102 is doped with conductive nanomaterials, wherein the conductive nanomaterials are one of gold nanoparticles, silver nanoparticles, gold nanowires, silver nanowires, and carbon nanotubes.

[0048] Preferably, the substrate material of the functional circuit 2 is a flexible material, which is polyimide (PI) or polyethylene terephthalate (PET).

[0049] Preferably, the protective shell 4 is made of flexible, skin-friendly silicone material.

[0050] Preferably, the outer diameter of the hollow cylindrical structure is smaller than that of the circular through hole 5.

[0051] A method for preparing a suction cup-type conductive hydrogel electrode 1 includes the following steps:

[0052] Step 1: Prepare auxiliary preparation tools: release paper 7, sleeve 8, push rod 9;

[0053] Step 2: Place the release paper 7 at the bottom of the sleeve 8, and use a syringe to inject the liquid conductive hydrogel into the inside of the sleeve 8;

[0054] Step 3: Heat the sleeve 8 at a constant temperature of 50℃~100℃ for 3~5 hours to transform the liquid conductive hydrogel into solid conductive hydrogel 102.

[0055] Step 4: Insert the suction cup 101 into the circular through hole 5 and fix it to the bottom surface of the protective shell 4 by adhesive bonding;

[0056] Step 5: Invert the sleeve 8 and place it inside the suction cup 101. Remove the release paper 7. Insert the push rod 9 into the sleeve 8. Press down the push rod 9 to push the solid conductive hydrogel 102 into close contact with the pad 3. Then pull up the sleeve 8 so that the solid conductive hydrogel 102 is placed inside the suction cup 101 in an interference fit.

[0057] Step 6: Repeat steps 1-5 until all suction cup conductive hydrogel electrodes 1 are installed.

[0058] Preferably, in step 3, the sleeve is heated at a constant temperature of 70°C for 4 hours.

[0059] Preferably, the release paper 7 is a smooth, circular paper sheet.

[0060] Preferably, the sleeve 8 is a hollow cylinder made of glass.

[0061] Preferably, the push rod 9 is made of glass material, with a cylindrical rod at the top and a circular sheet at the bottom. Specific implementation examples:

[0063] Example 1:

[0064] See Figure 1This is a three-dimensional structural diagram of a flexible electronic wristband and a suction cup-type hydrogel electrode integration method provided in Embodiment 1 of the present invention. In Embodiment 1, the flexible electronic wristband includes: a suction cup-type conductive hydrogel electrode 1, a functional circuit 2, and a protective shell 4. When in operation, the flexible electronic wristband is worn on the wrist 6 of the human body, contacting the surface of the skin to collect electromyographic signals. The number of suction cup-type conductive hydrogel electrodes 1 is set according to actual needs, and the present invention does not impose a limitation; in this embodiment, four electrodes are used as an example. The suction cup-type conductive hydrogel electrode 1 consists of a suction cup 101 and a solid conductive hydrogel 102. The suction cup 101 is made of silicone material, with the upper part being a hollow cylindrical structure with an outer diameter of 3-6 mm, preferably 5 mm, and an inner diameter of 2-5 mm, preferably 4 mm. The lower part is a trapezoidal rotating suction cup structure, the size of which is not limited. The solid conductive hydrogel 102 is obtained by solidifying liquid conductive hydrogel and is doped with conductive nanomaterials, including but not limited to: gold nanoparticles, silver nanoparticles, gold nanowires, silver nanowires, and carbon nanotubes. The functional circuit substrate material is a flexible material, including but not limited to: polyimide (PI) and polyethylene terephthalate (PET); the bottom surface is arrayed with pads 3, the same number as the suction cup conductive hydrogel electrodes 1. The protective shell 4 is made of flexible, skin-friendly silicone material, with circular through holes 5 arranged on the bottom surface, the same number as the suction cup conductive hydrogel electrodes 1. The functional circuit 2 is placed inside the protective shell 4. The suction cup conductive hydrogel electrodes 1 are placed on the bottom surface of the protective shell 4. The hollow cylindrical structure of the suction cup 101 is connected to the through holes 5 by a sealed adhesive method. The solid conductive hydrogel 102 is in direct contact with the pads 3, and is bonded by the adhesive properties of the solid conductive hydrogel 102. The suction cup conductive hydrogel electrodes are prepared using auxiliary tools. The auxiliary preparation tools include: release paper 7, sleeve 8, and push rod 9. The release paper 8 is a smooth circular paper sheet with a diameter of 8 mm. Sleeve 8 is a hollow cylinder made of glass, with an inner diameter slightly larger than the inner diameter of the hollow cylindrical structure of suction cup 101, which is 4.1 mm. Its wall thickness is 0.2 mm, and its height is 15 mm. Push rod 9 is made of glass, with a cylindrical upper part having a diameter of 1.5 mm and a length of 20 mm, and a circular thin sheet at the bottom, with the same diameter as the inner diameter of sleeve 8 and a thickness of 0.2 mm.

[0065] like Figure 2 The preparation method of the suction cup type conductive hydrogel electrode 1 in this embodiment includes the following steps:

[0066] S1. Prepare auxiliary preparation tools: release paper 7, sleeve 8, push rod 9;

[0067] S2. Place the release paper 7 at the bottom of the sleeve 8 and use a syringe to transfer the liquid conductive hydrogel into the inside of the sleeve 8;

[0068] S3. Heat the sleeve 8 at a constant temperature of 50℃ to 100℃ for 3 to 5 hours. Preferably, heat at a constant temperature of 70℃ for 4 hours.

[0069] S4. Fix the suction cup 101 to the bottom surface of the protective shell 4 by adhesive bonding.

[0070] S5. Invert the sleeve 8 and place it inside the suction cup 101. Remove the release paper 7. Insert the push rod 9 into the sleeve 8. Press down the push rod 9 to push the solid conductive hydrogel 102 into close contact with the solder pad 3. Then pull up the sleeve 8 so that the solid conductive hydrogel is placed inside the suction cup 101 in an interference fit.

[0071] S6. Repeat steps S1-S5 until all suction cup conductive hydrogel electrodes 1 are installed.

[0072] See Figure 3 This is a schematic diagram of the operation of the suction cup hydrogel electrode 1 provided in Embodiment 1 of the present invention. The underwater wrist electromyography (EMG) acquisition flexible electronic wristband initially has a solid conductive hydrogel 102 with a height of h1. After the electronic wristband is worn on the wrist, the suction cup 101 releases air, and due to the vacuum adsorption effect, the solid conductive hydrogel 102 is subjected to atmospheric pressure, causing it to deform under downward pressure f1, where h1 < h2, thus adhering tightly to the skin. Simultaneously, the solid conductive hydrogel 102 experiences a reaction force f1. ′ f1 ′ = f1. When human skin sweats or is slightly immersed in water, the solid conductive hydrogel 102 absorbs water and swells. Due to the vacuum adsorption effect, it is further compressed, and its height becomes h3, where h3 < h2. The downward pressure f1 on the solid conductive hydrogel 102 increases to f2, and the support reaction force f2 ′ =f2.

[0073] Example 2

[0074] Except for the inner diameter of sleeve 8 and certain steps in the preparation method of suction cup conductive hydrogel electrode 1, this embodiment is the same as in Example 1. In this embodiment, the inner diameter of sleeve 8 is smaller than the inner diameter of the hollow cylindrical structure of suction cup 101, which is 3.8 mm.

[0075] like Figure 4 The preparation method of the suction cup type conductive hydrogel electrode 1 in this embodiment includes the following steps:

[0076] S1. Prepare auxiliary preparation tools: sleeve 8, push rod 9;

[0077] S2. Place the sleeve 8 inside the suction cup 101 and use a syringe to transfer the liquid conductive hydrogel into the sleeve 8.

[0078] S3. Heat the entire flexible electronic wristband at a constant temperature of 50℃~100℃ for 3~5 hours. Preferably, heat at a constant temperature of 70℃ for 4 hours.

[0079] S4. Insert the push rod 9 into the sleeve 8, press down the push rod 9 while pulling up the sleeve 8, so that the solid conductive hydrogel is placed inside the suction cup 101.

[0080] S5. Repeat steps S1-S4 until all suction cup conductive hydrogel electrodes 1 are installed.

[0081] Compared with the method in Example 1, Example 2 uses in-situ curing to solidify the liquid conductive hydrogel, making the preparation process more convenient; different sizes of solid conductive hydrogel 102 can be obtained according to different shaped and sized sleeves, making it more flexible to adapt to suction cups.

[0082] Example 3

[0083] Except for the inner diameter of sleeve 8 and the preparation steps of suction cup conductive hydrogel electrode 1, it is the same as in Example 1. In this example, the inner diameter of sleeve 8 is smaller than the inner diameter of the hollow cylindrical structure of suction cup 101, which is 3.8 mm. At the same time, a short sleeve 10 with a height of 8 mm and other parameters are the same is introduced.

[0084] like Figure 5 The preparation method of the suction cup type conductive hydrogel electrode 1 in this embodiment includes the following steps:

[0085] S1. Prepare auxiliary preparation tools: release paper 7, sleeve 8, push rod 9, short sleeve 10;

[0086] S2. Place the release paper 7 at the bottom of the short sleeve 10 and use a syringe to transfer the liquid conductive hydrogel into the inside of the short sleeve 10.

[0087] S3. Heat the short sleeve 10 at a constant temperature of 50℃ to 100℃ for 3 to 5 hours. Preferably, heat at a constant temperature of 70℃ for 4 hours.

[0088] S4. Repeat steps S1 to S2 to prepare a large amount of solid conductive hydrogel 102.

[0089] S5. Invert the sleeve 8 and place it inside the suction cup 101. Remove the release paper 7, place the solid conductive hydrogel 102 inside the sleeve 8, and press down the push rod 9 to push the solid conductive hydrogel 102 into close contact with the solder pad 3.

[0090] S6. Remove the release paper 7 from the inside of the sleeve 8 of the solid conductive hydrogel 102, press down the push rod 9 to make the solid conductive hydrogel 102 come into close contact with the solid conductive hydrogel 102 placed in step S5, and then pull out the push rod 9.

[0091] S7. Repeat step S6 until the solid conductive hydrogel 102 fills the height of the suction cup 101. Then insert the push rod 9 into the sleeve 8, press down the push rod 9 while pulling up the sleeve 8.

[0092] S8. Repeat steps S5 to S7 until the solid conductive hydrogel 102 fills the height of the suction cup 101. Then insert the push rod 9 into the sleeve 8 until all suction cup conductive hydrogel electrodes 1 are installed.

[0093] Compared with the method in Example 1, Example 3 uses a small-sized button cell-type solid conductive hydrogel 102 to fill the suction cup 101. The advantages are: (1) the solid conductive hydrogel 102 can be mass-produced as a component in advance; (2) the end of the solid conductive hydrogel 102 is more susceptible to contamination by dust, oil, sweat, etc., so only a single solid conductive hydrogel 102 at the end can be replaced, saving hydrogel electrode material. In addition, it is also convenient to replace the solid conductive hydrogel 102 that has been damaged.

Claims

1. A flexible electronic wristband, characterized in that, It includes multiple suction cup-type conductive hydrogel electrodes, functional circuitry, and a protective housing; among which, The functional circuit is used for electromyography signal acquisition and processing; the functional circuit is placed inside the protective housing; the bottom surface of the functional circuit is provided with multiple pads, the number of which is the same as that of the suction cup conductive hydrogel electrode. The suction cup conductive hydrogel electrode includes a suction cup and a solid conductive hydrogel. The suction cup is made of silicone material, with the upper part being a hollow cylindrical structure and the lower part being a trapezoidal rotating suction cup structure. The solid conductive hydrogel is obtained by curing liquid conductive hydrogel and fills the hollow cylindrical structure of the suction cup. Multiple circular through holes are arranged on the bottom surface of the protective shell, and the number of circular through holes is the same as the number of suction cup conductive hydrogel electrodes. The suction cup conductive hydrogel electrodes are placed on the bottom surface of the protective shell. The hollow cylindrical structure of the suction cup is placed in the through holes in a sealed adhesive manner. The solid conductive hydrogel is in direct contact with the pads and is bonded by the adhesive properties of the solid conductive hydrogel. The flexible electronic wristband is worn on the wrist and comes into contact with the skin to collect electromyographic signals. Method for preparing conductive hydrogel electrodes; Step 1: Prepare auxiliary preparation tools: release paper, sleeve, push rod, short sleeve; Step 2: Place the release paper at the bottom of the short sleeve, and use a syringe to inject the liquid conductive hydrogel into the inside of the short sleeve; Step 3: Heat the short sleeve at a constant temperature of 70°C for 4 hours to transform the liquid conductive hydrogel into a solid conductive hydrogel with water absorption and expansion properties. Step 4: Repeat steps 1 to 3 to prepare several solid conductive hydrogels; Step 5: Invert the sleeve and place it inside the suction cup. Remove the release paper, place the solid conductive hydrogel inside the sleeve, and press down the push rod to push the solid conductive hydrogel into close contact with the pad. Step 6: Invert the solid conductive hydrogel and place it inside the sleeve. Remove the release paper, press down the push rod to make the solid conductive hydrogel come into close contact with the solid conductive hydrogel placed in Step 5, and then pull out the push rod. Step 7: Repeat step 6 until the solid conductive hydrogel fills the height of the suction cup, then put the push rod into the sleeve, press down the push rod while pulling up the sleeve. Step 8: Repeat steps 5 through 7 until all suction cup conductive hydrogel electrodes are installed.

2. The flexible electronic wristband according to claim 1, characterized in that, Release paper is a smooth, round sheet of paper.

3. The flexible electronic wristband according to claim 1, characterized in that, The sleeve is a hollow cylinder made of glass.

4. The flexible electronic wristband according to claim 1, characterized in that, The push rod is made of glass, with a cylindrical upper part and a circular thin plate at the bottom.

5. The flexible electronic wristband according to claim 1, characterized in that, Solid conductive hydrogels are doped with conductive nanomaterials, which are one of the following: gold nanoparticles, silver nanoparticles, gold nanowires, silver nanowires, and carbon nanotubes.

6. The flexible electronic wristband according to claim 1, characterized in that, The substrate material for the functional circuit is a flexible material, which is either polyimide (PI) or polyethylene terephthalate (PET).

7. The flexible electronic wristband according to claim 1, characterized in that, The protective shell is made of flexible, skin-friendly silicone.

8. The flexible electronic wristband according to claim 1, characterized in that, The outer diameter of the hollow cylindrical structure is smaller than the inner diameter of the circular through hole.

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