A magnetic liquid metal-based flexible electrode for electrocardiogram monitoring and a preparation method thereof

Abstract

The present invention discloses a magnetic liquid metal-based flexible electrode for electrocardiogram monitoring and a preparation method thereof, and belongs to the technical field of electrocardiogram monitoring. The flexible electrode includes an electrode layer, a flexible substrate layer, a transmission layer, and a packaging layer from bottom to top; the electrode layer is composed of a plurality of electrode sheets, which are distributed at the bottom of the flexible substrate layer, and the electrode sheets are a mixture of magnetic liquid metal particles and a silica gel solution. The magnetic liquid metal particles are gathered at the bottom through a magnetic field, and finally broken and flowed out to be attached to the bottom as a conductive layer; the transmission layer is located on the upper layer of the flexible substrate layer, and is composed of a plurality of magnetic liquid metal wires I, and the magnetic liquid metal wire II passes through the flexible substrate layer to connect the magnetic liquid metal wire I with the electrode sheet. The present invention utilizes the properties of magnetic liquid metal, and can maintain a stable connection in different body parts and motion states, and accurately obtain electrocardiogram signals. The electrode exhibits excellent conductivity within the electrocardiogram signal range of 0-100Hz, and can also fit closely to human skin, reduce signal interference, and provide more accurate electrocardiogram monitoring.

Description

Technical Field

[0001] The invention belongs to the technical field of electrocardiogram monitoring, and in particular relates to a magnetic liquid metal-based flexible electrode for electrocardiogram monitoring and a preparation method thereof. Background Art

[0002] In recent years, with the continuous development of ECG signal monitoring technology, people's requirements for ECG signal monitoring equipment have become higher and higher. Traditional ECG monitoring equipment uses rigid electrodes, mainly the most commonly used commercial electrodes silver / silver chloride. The above electrodes are generally made of metal materials and have good conductivity. However, there are some shortcomings in traditional rigid electrodes, which limit their application in the field of ECG monitoring. First, the adaptability of traditional rigid electrodes to human skin is poor. Since the rigid electrodes need to be pasted on human skin during use, and human skin has different bending and structural changes. Traditional rigid electrodes cannot contact human skin well, which can easily cause discomfort and even cause skin damage. Secondly, the use of traditional rigid electrodes is not flexible enough. Traditional rigid electrodes need to be fixed on human skin with adhesives or tapes, and the use process is relatively cumbersome. For patients who need to monitor ECG signals for a long time, the use of rigid electrodes will cause certain inconveniences. In addition, traditional rigid electrodes are easily disturbed by movement. Since the rigid electrodes cannot fully contact human skin, as the human body moves, there may be gaps in the contact between the ECG signal and the electrode, resulting in inaccurate monitoring results.

[0003] In order to solve these problems of traditional rigid electrodes, researchers have proposed the concept and technology of flexible electrodes. Flexible electrodes are made of soft materials, which can better contact with human skin and improve adaptability and comfort. Moreover, flexible electrodes have good flexibility and can adapt to the bending and structural changes of human skin, so as to better maintain the stable detection of ECG signals. In addition, the use of flexible electrodes is also more convenient and flexible. Flexible electrodes are generally made of adhesive materials and can be directly attached to human skin, making the use process simpler and faster. For patients who need to monitor ECG signals for a long time, flexible electrodes are more convenient and comfortable.

[0004] Chinese patent document CN202010236049.2 discloses a silk flexible electrode and a method for making the same. The silk flexible electrode includes a backing, on which a first conductive glue is provided; a textile substrate, which is placed above the first conductive glue; a metal wire functional layer, which is a mesh structure and has woven nodes at the intersection, and the metal wire functional layer covers the textile substrate; a silk composite membrane, which is a mixture of a silk solution and a polymer solution, which is attached to the metal wire functional layer, and a second conductive glue is provided on the silk composite membrane; a protective layer, which is provided above the second conductive glue. Similarly, the conductive materials of the existing flexible electrodes for ECG monitoring are mostly rigid metal materials, and the rigid metal conductive materials have a high hardness, resulting in poor flexibility and difficulty in adapting to complex curved surfaces or dynamic deformation scenes. In addition, due to the influence of the rigid material, the overall bonding performance of the electrode is poor, and it is impossible to achieve close bonding with the detected object or surface, which is easy to cause signal interference and affect the accuracy of the measurement. Therefore, in applications that require better flexibility, fit, durability and adaptability, the present invention proposes a magnetic liquid metal-based flexible electrode with adaptability, high conductivity and good fit, which is of great significance for achieving more accurate and convenient wearable ECG monitoring. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned prior art, the present invention provides a magnetic liquid metal-based flexible electrode for ECG monitoring and a preparation method thereof. The present invention proposes a magnetic liquid metal-based flexible electrode with adaptability, high conductivity and good fit. By combining with biocompatible materials, its application potential in wearable ECG monitoring equipment and cardiac health monitoring is improved. The electrode utilizes the special properties of magnetic liquid metal to design this adaptive ECG monitoring flexible electrode, which can maintain a stable connection in different body parts and motion states, so as to accurately obtain ECG signals. Moreover, the electrode exhibits excellent conductivity within the ECG signal range of 0-100Hz. At the same time, the flexible electrode has excellent fit, can fit closely to human skin, reduce signal interference, and provide more accurate ECG monitoring. It can not only adapt to monitoring in a static state, but also keenly capture instantaneous changes in cardiac activity.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A magnetic liquid metal-based flexible electrode for electrocardiogram monitoring, comprising an electrode and a flexible substrate layer, a transmission layer, and a packaging layer from bottom to top;

[0008] The electrode and flexible substrate layer include an electrode layer and a flexible substrate layer located above the electrode layer, the electrode layer is composed of three or more electrode sheets that are not in contact with each other, and the electrode sheets are distributed at the bottom of the flexible substrate layer; the electrode sheet is a mixture of magnetic liquid metal and silica gel solution, and then the magnetic liquid metal particles are gathered at the bottom of the electrode sheet through a magnetic field and finally broken and flowed out to attach to the bottom of the electrode sheet to form a conductive layer; the transmission layer is located on the upper layer of the flexible substrate layer, and is composed of three or more magnetic liquid metal wires I, and the magnetic liquid metal wires II pass through the flexible substrate layer to connect the magnetic liquid metal wires I with the electrode sheets of the electrode layer.

[0009] As a preferred embodiment of the present invention, the flexible substrate layer is obtained by solidifying a silica gel solution. The silica gel solution is an addition-type silica gel, a commercially available product. The silica gel solution includes component A and component B, component A includes silicon dioxide and vinyl silicone oil, and component B is a platinum catalyst.

[0010] As a preferred embodiment of the present invention, the mass ratio of component A to component B is 3:2.

[0011] As a preferred embodiment of the present invention, the magnetic liquid metal includes liquid metal and nickel powder, and the mass ratio of the liquid metal to the nickel powder is 9:1; the liquid metal is liquid metal gallium and indium stirred at a mass ratio of 3:1 at 90°C.

[0012] As a preferred embodiment of the present invention, after the magnetic liquid metal is mixed with silica gel, the magnetic liquid metal is in a granular form, and the magnetic liquid metal particles are micron-sized spherical particles.

[0013] As a preferred embodiment of the present invention, the magnetic liquid metal wire I is a mixture of magnetic liquid metal and silica gel solution, and then the magnetic liquid metal particles are gathered at the top of the magnetic liquid metal wire I through a magnetic field and finally ruptured and flowed out to attach to the top of the magnetic liquid metal wire I as a conductive wire.

[0014] As a preferred embodiment of the present invention, the magnetic liquid metal wire II passes through the flexible base layer to connect one end of the top conductive wire of the magnetic liquid metal wire I to the conductive layer at the bottom of the electrode layer.

[0015] As a preferred embodiment of the present invention, the number of the magnetic liquid metal wires I is the same as the number of the electrode sheets in the electrode layer.

[0016] The magnetic liquid metal wires I are independent of each other and do not touch each other. One end is connected to the conductive layer of the electrode sheet through the magnetic liquid metal wire II, and the other end is connected to the ECG module port through the magnetic liquid metal wire III, that is, connected to the functional circuit board interface.

[0017] The present invention also claims a method for preparing the magnetic liquid metal-based flexible electrode for electrocardiogram monitoring, comprising the following steps:

[0018] (1) stirring liquid gallium and liquid indium at 90° C. for 10 hours to obtain gallium-indium liquid metal; mixing and stirring the gallium-indium liquid metal and nickel powder to obtain magnetic liquid metal;

[0019] (2) stirring component A and component B at room temperature to obtain a silica gel solution;

[0020] (3) After mixing the silica gel solution and the magnetic liquid metal, pour the mixture into three or more electrode sheets in the electrode and flexible substrate layer mold, and then pour the silica gel solution on top until the mold is full;

[0021] (4) applying a uniform magnetic field at the bottom of the mold to gather the magnetic liquid metal particles at the bottom of the electrode sheet, and then leaving it to stand for 30 minutes to obtain an electrode and a flexible substrate layer in a semi-solidified state;

[0022] (5) After mixing the silica gel solution and the magnetic liquid metal, pouring them into the transmission layer mold, then closing the electrode and the flexible substrate layer mold with the transmission layer mold, and applying a uniform magnetic field above the transmission layer mold, after the electrode and the flexible substrate layer and the transmission layer are solidified, removing the magnetic field and demolding, after demolding, due to the rupture of the magnetic liquid metal particles at the bottom of the electrode sheet and the top of the transmission layer, the bottom of the electrode sheet and the top of the magnetic liquid metal wire I in the transmission layer are connected to form a conductive layer or conductive line;

[0023] (6) constructing a through hole between the conductive layer of the electrode sheet and one end of the conductive wire of the transmission layer, then injecting magnetic liquid metal into the through hole to connect the conductive layer of the electrode sheet and the conductive wire of the transmission layer, and finally coating a layer of silica gel solution on the upper layer of the transmission layer for encapsulation;

[0024] (7) After solidification, a hole is constructed at the packaging layer position corresponding to the other end of the conductive wire of the transmission layer, and magnetic liquid metal is injected into the hole to obtain a magnetic liquid metal-based flexible electrode for electrocardiogram monitoring.

[0025] As a preferred embodiment of the present invention, a laser marking machine is used to construct the through holes and the holes.

[0026] As a preferred embodiment of the present invention, the mass ratio of the silica gel solution to the magnetic liquid metal is 2:1.

[0027] As a preferred embodiment of the present invention, the electrode and the materials in the flexible base layer mold and the transmission layer mold are molded together when they are in a semi-solidified state, and then solidified simultaneously.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The magnetic liquid metal-based flexible electrode for ECG monitoring described in the present invention comprises a flexible base layer, a conductive body and a packaging layer. First, the magnetic liquid metal electrode sheet of the electrode layer ensures excellent conductivity, and the electrode sheet is slightly raised to ensure that it is always in contact with the skin during use, so that bioelectric signals can be accurately collected. Secondly, the overall flexibility of the electrode sheet allows the electrode to perfectly fit the body curve, adapt to body movement, and significantly reduce signal interference. In the present invention, a special confinement method is used for the magnetic liquid metal, and most of the volume of the magnetic liquid metal spherical particles is fixed in the flexible base layer, with only a small part of the spherical surface exposed at the bottom. This design can not only store the magnetic liquid metal, but also use the unique adhesion of the liquid metal to attract the exposed part to prevent it from being lost or left on the skin. In addition, the structure also enhances the reliability of the electrode, ensuring that it can work stably during use. The magnetic liquid metal wire I in the transmission layer serves as a bridge connecting the electrode and the ECG module, which greatly improves the stability of signal transmission. In addition, the design of the through-hole structure plays an important role in signal transmission. Through the connection of magnetic liquid metal in the through-hole, efficient signal transmission between the electrode layer and the transmission layer is achieved, ensuring the quality and stability of the signal. The encapsulation layer uses the same ratio of silicone solution to not only protect the transmission layer, but also ensure the overall flexibility and enhance the overall safety and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Cross-section of a magnetic liquid metal-based flexible electrode for ECG monitoring.

[0031] Figure 2 This is a structural diagram of a magnetic liquid metal-based flexible electrode for ECG monitoring.

[0032] Figure 3 Cross-sectional diagram of the preparation process of magnetic liquid metal-based flexible electrodes for ECG monitoring.

[0033] Figure 4 Flow chart for the preparation of magnetic liquid metal-based flexible electrodes for ECG monitoring.

[0034] Figure 5 The test results of the bonding strength of magnetic liquid metal-based flexible electrodes used for ECG monitoring on the surfaces of different materials.

[0035] Figure 6 The relative resistance of the magnetic liquid metal wire of the magnetic liquid metal-based flexible electrode for electrocardiogram monitoring changes with strain.

[0036] Figure 7 This is the ECG signal test spectrum of the magnetic liquid metal-based flexible electrode used for ECG monitoring.

[0037] In the figure, 1. packaging layer, 2. holes, 3. magnetic liquid metal wire I, 4. flexible substrate layer, 5. through hole, 6. electrode sheet, 7. tweezers, 8. syringe, 9. indium powder, 10. beaker, 11. magnetic stirrer, 12. liquid gallium, 13. rotor, 14. gallium-indium liquid metal, 15. glass rod, 16. nickel powder, 17. magnetic liquid metal, 18. straw, 19. component A, 20. component B, 21. silica gel solution, 22. magnetic liquid metal ink, 23. electrode and flexible substrate layer mold, 24. magnet, 25. transmission layer mold, 27. magnetic liquid metal wire II, 26. magnetic liquid metal wire III, 28. laser marking machine, 29. laser beam. DETAILED DESCRIPTION

[0038] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0039] Example 1

[0040] like Figure 1-3 As shown, a magnetic liquid metal-based flexible electrode for electrocardiogram monitoring includes, from bottom to top, an electrode and a flexible substrate layer, a transmission layer, and a packaging layer 1;

[0041] The electrode and flexible substrate layer include an electrode layer and a flexible substrate layer 4 located above the electrode layer. The electrode layer is composed of three electrode sheets 6 that do not contact each other. The electrode sheets 6 are distributed at the bottom of the flexible substrate layer 4 and are used to directly contact human skin to better collect bioelectric signals. The electrode sheet 6 is a mixture of magnetic liquid metal 17 and silica gel solution 21, and then the magnetic liquid metal particles are gathered at the bottom of the electrode sheet 6 through a magnetic field and finally broken and flowed out to adhere to the bottom of the electrode sheet 6 as a conductive layer.

[0042] The flexible substrate layer 4, as an important carrier of the electrode layer and the transmission layer, is placed above the electrode layer.

[0043] The transmission layer is composed of three magnetic liquid metal wires Ⅰ3, which are placed on the flexible base layer 4. The magnetic liquid metal wire Ⅰ3 is a mixture of magnetic liquid metal 17 and silica gel solution 21, and then the magnetic liquid metal particles are gathered on the top of the magnetic liquid metal wire Ⅰ3 through a magnetic field, and finally broken and flowed out to attach to the top of the magnetic liquid metal wire Ⅰ3 as a conductive wire.

[0044] The electrode sheets 6 of the three electrode layers and one end of the top conductive wires of the three magnetic liquid metal wires Ⅰ3 of the transmission layer are connected to each other through the magnetic liquid metal wires Ⅱ27 in the three through holes 5. The three magnetic liquid metal wires Ⅰ3 do not contact each other, the three through holes 5 do not contact each other, and the three magnetic liquid metal wires Ⅰ3 do not contact each other.

[0045] The encapsulation layer 1 is placed above the transmission layer as a protective film for the transmission layer, and three holes 2 are provided thereon corresponding to the other port of the magnetic liquid metal wire Ⅰ3. The holes 2 are filled with magnetic liquid metal to form a magnetic liquid metal wire Ⅲ26, which is used as a connection point between the magnetic liquid metal wire Ⅰ3 and the serial port of the ECG module.

[0046] like Figure 4 As shown, a method for preparing a magnetic liquid metal-based flexible electrode for electrocardiogram monitoring comprises the following steps:

[0047] (1) 4 g of liquid gallium 12 and 1 g of indium powder 9 are stirred at 90° C. at a speed of 300 r / min for 10 h to obtain gallium-indium liquid metal 14; 2 g of gallium-indium liquid metal 14 and 0.22 g of nickel powder 16 are mixed and stirred until the nickel powder 16 is completely coated by the gallium-indium liquid metal 14 to obtain magnetic liquid metal 17.

[0048] When the proportion of the gallium-indium liquid metal 14 is increased, the magnetism of the magnetic liquid metal 17 will be weaker; and reducing the content of the gallium-indium liquid metal 14 will affect the fluidity and conductivity of the magnetic liquid metal 17, so the present invention selects a ratio of 9:1.

[0049] (2) 6 g of component A19 and 4 g of component B20 were stirred at room temperature at a speed of 100 r / min to obtain a silica gel solution 21.

[0050] The silica gel solution 21 in the electrode and the flexible substrate layer is formed by mixing and stirring component A19 and component B20 in a mass ratio of 3:2 for 1 hour and solidifying, and the thickness of the flexible substrate layer 4 is 1 mm. Too high a content of component A19 will make it difficult for the silica gel to solidify, while too low a content of component A will increase the hardness of the silica gel after solidification and lose its adhesion. In order to ensure that the silica gel base patch fits well with the skin and is not easy to fall off, and at the same time does not cause discomfort to the human body, the present invention selects a ratio of component A19 and component B20 of 3:2. In addition, if the thickness of the flexible substrate layer 4 is too high, it will affect its adhesion ability and overall volume, so a sticky silica gel substrate with a thickness of 1 mm is selected.

[0051] (3) 4 g of silica gel solution 21 and 2 g of magnetic liquid metal 17 are mixed evenly to obtain magnetic liquid metal ink 22. The magnetic liquid metal ink 22 is poured into the three electrode sheets 6 in the electrode and flexible substrate layer mold 23 until slightly overflowing. Then, the silica gel solution 21 is poured on top until the mold is full.

[0052] When the magnetic liquid metal 17 is mixed with the silicone solution 21, if the proportion of the magnetic liquid metal 17 is too high, although the conductivity can be significantly improved, it is also easy to leak and cannot be well combined with the flexible base layer 4. When the proportion of the magnetic liquid metal 17 is low, the conductivity of the mixture will be significantly reduced or even insulated. Therefore, in order to effectively collect bioelectric signals and ensure that the magnetic liquid metal 17 is not easy to leak, the present invention selects a ratio of 1:2 between the magnetic liquid metal 17 and the silicone solution 21.

[0053] Selecting to use the same proportion of silica gel solution 21 to make magnetic liquid metal ink 22 is conducive to the silica gel solution 21 in the electrode layer and the flexible substrate layer 4 to be well combined. Secondly, the electrode layer and the flexible substrate layer 4 are successively made to prevent the delamination between the two structures.

[0054] (4) A uniform magnetic field is applied at the bottom of the mold to gather the magnetic liquid metal particles at the bottom of the electrode sheet 6, and then solidify for 30 minutes to obtain the electrode and the flexible substrate layer.

[0055] The purpose of applying a magnetic field below the electrode and flexible substrate layer mold 23 is to attract the magnetic liquid metal particles in the electrode layer ink to the bottom surface of the mold so as to subsequently manufacture the conductive electrode sheet 6 .

[0056] (5) Pour the magnetic liquid metal ink 22 into the transmission layer mold 25 until it overflows slightly; then close the electrode and flexible substrate layer mold 23 and the transmission layer mold 25, and apply a uniform magnetic field above the transmission layer mold 25. After the electrode, the flexible substrate layer and the transmission layer are solidified, remove the magnetic field and demold. After demolding, the magnetic liquid metal particles at the bottom of the electrode sheet 6 and the top of the transmission layer are broken, and a conductive layer or conductive wire is formed at the bottom of the electrode sheet 6 and the top of the magnetic liquid metal wire Ⅰ3 in the transmission layer.

[0057] In order to prevent the uniform magnetic field above the transmission layer mold 25 from attracting the magnetic liquid metal particles in the electrode layer 6 to move upward, and at the same time to connect the small amount of viscous silicone contained in the transmission layer with the viscous silicone in the flexible base layer 4, the materials in the electrode and flexible base layer mold 23 and the transmission layer mold 25 are molded together in a semi-solidified state and then solidified at the same time.

[0058] The purpose of applying a magnetic field above the transmission layer mold 25 is to attract the magnetic liquid metal particles in the transmission layer ink to the top surface so as to subsequently produce a magnetic liquid metal wire I3 with high conductivity.

[0059] In this embodiment, under the influence of the magnetic field, the magnetic liquid metal particles in the ink will gather to the side with a strong magnetic field. From the microscopic structure, most of the volume of the spherical magnetic liquid metal particles is embedded in the silicone base, and the rest is directly in contact with the bottom of the mold. Therefore, the electrode layer and the transmission layer will be in an insulating state before the mold is peeled off. During the peeling process, the magnetic liquid metal particles in the silicone will be broken due to stress concentration, and the internal liquid metal will flow out and evenly adhere to the surface of the peeling surface, thereby achieving the purpose of conduction.

[0060] The liquid metal particles can also be destroyed by peeling, scraping, pressing, laser or ultrasound to connect them to each other, thereby achieving the effect of conductivity.

[0061] (6) A through hole 5 is constructed between the conductive layer of the electrode sheet 6 and one end of the conductive wire of the transmission layer by using a laser marking machine 28, and then a magnetic liquid metal 17 is injected into the through hole 5 to form a magnetic liquid metal wire II 27, which connects the conductive layer of the electrode sheet 6 and the conductive wire of the transmission layer. Finally, a layer of silicone solution 21 is coated on the upper layer of the transmission layer for packaging. Then, three holes 2 are set on the packaging layer 1 corresponding to the other end of the three magnetic liquid metal wires I 3 by using a laser marking machine 28, and the holes 2 are filled with magnetic liquid metal to form a magnetic liquid metal wire III 26, which is used as a connection point between the magnetic liquid metal wire I 3 and the serial port of the ECG module.

[0062] In this embodiment, after the liquid metal particles of the conductive layer of the electrode sheet 6 and the conductive wire of the magnetic liquid metal wire Ⅰ3 are broken by external mechanical force, the resistance of the conductive layer and the conductive wire is less than 1Ω, and bioelectric signals can be stably collected and transmitted.

[0063] The magnetic liquid metal-based flexible electrode for ECG monitoring provided in the embodiment of the present invention has a simple structure and low cost. The flexible electrode patch composed of the magnetic liquid metal electrode sheet 6 and the adhesive silicone has adaptability, high conductivity, and good adhesion. It can not only collect ECG signals normally, but also is comfortable to wear.

[0064] In addition, if Figure 5 As shown, the bonding strength of the silicone flexible substrate of the present invention is measured when in contact with surfaces of different materials. The test results show that the bonding strength with human skin is 15.6 kPa, indicating that it can fit well with the skin, ensuring that the flexible electrode can fit stably on the surface of the human body.

[0065] In addition, if Figure 6 As shown, according to the manufacturing process of the present invention, a flexible wire is manufactured to facilitate the measurement of its conductivity. Its original length is 6 cm, and its initial resistance value is 0.5Ω. Its conductivity is measured to be 1.88×10 4 S / m, and its resistance changes very little under continuous stretching.

[0066] In addition, if Figure 7 As shown, the magnetic liquid metal-based flexible electrode of the present invention can detect electrocardiographic signals.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A magnetic liquid metal-based flexible electrode for electrocardiogram monitoring, characterized in that: From bottom to top, it includes electrodes and flexible substrate layer, transmission layer, and packaging layer; The electrode and flexible substrate layer include an electrode layer and a flexible substrate layer located above the electrode layer, the electrode layer is composed of more than three electrode sheets that are not in contact with each other, and the electrode sheets are distributed at the bottom of the flexible substrate layer; the electrode sheet is a mixture of magnetic liquid metal and silica gel solution, and then the magnetic liquid metal particles are gathered at the bottom of the electrode sheet through a magnetic field and finally broken and flowed out to adhere to the bottom of the electrode sheet as a conductive layer; the transmission layer is located on the upper layer of the flexible substrate layer, and is composed of more than three magnetic liquid metal wires I, and the magnetic liquid metal wires II pass through the flexible substrate layer to connect the magnetic liquid metal wires I with the electrode sheets of the electrode layer; The magnetic liquid metal comprises liquid metal and nickel powder, wherein the mass ratio of the liquid metal to the nickel powder is 9:1; the liquid metal is obtained by stirring liquid metal gallium and indium at a mass ratio of 3:1 at 90°C; The magnetic liquid metal wire I is a mixture of magnetic liquid metal and silica gel solution, and then the magnetic liquid metal particles are gathered on the top of the magnetic liquid metal wire I through a magnetic field, and finally broken and flowed out to attach to the top of the magnetic liquid metal wire I as a conductive wire; The magnetic liquid metal wire II is formed of magnetic liquid metal.

2. The magnetic liquid metal-based flexible electrode for electrocardiogram monitoring according to claim 1, characterized in that: The flexible base layer is obtained by solidifying a silica gel solution.

3. The magnetic liquid metal-based flexible electrode for electrocardiogram monitoring according to claim 1, characterized in that: The magnetic liquid metal particles are micron-sized spherical particles.

4. The magnetic liquid metal-based flexible electrode for electrocardiogram monitoring according to claim 1, characterized in that: The magnetic liquid metal wire II passes through the flexible base layer, and connects one end of the top conductive wire of the magnetic liquid metal wire I to the conductive layer at the bottom of the electrode sheet.

5. The magnetic liquid metal-based flexible electrode for electrocardiogram monitoring according to claim 1, characterized in that: The number of the magnetic liquid metal wires I is the same as the number of the electrode sheets in the electrode layer.

6. The method for preparing the magnetic liquid metal-based flexible electrode for electrocardiogram monitoring according to any one of claims 1 to 5, characterized in that: The steps include: (1) stirring liquid gallium and indium at 90° C. for 10 hours to obtain gallium-indium liquid metal; mixing and stirring the gallium-indium liquid metal and nickel powder to obtain magnetic liquid metal; (2) After mixing the silica gel solution and the magnetic liquid metal, pour the mixture into the electrode sheet in the electrode and flexible substrate layer mold, and then pour the silica gel solution on top until the mold is full; (3) applying a uniform magnetic field at the bottom of the mold to gather the magnetic liquid metal particles at the bottom of the electrode sheet, and then solidifying for 30 minutes to obtain the electrode and the flexible substrate layer; (4) After mixing the silica gel solution and the magnetic liquid metal, pouring them into the transmission layer mold, then closing the electrode and the flexible substrate layer mold with the transmission layer mold, and applying a uniform magnetic field above the transmission layer mold, after the electrode and the flexible substrate layer and the transmission layer are solidified, removing the magnetic field and demolding, the magnetic liquid metal particles at the bottom of the electrode sheet and the top of the transmission layer are broken, and a conductive layer or conductive wire is formed at the bottom of the electrode sheet and the top of the magnetic liquid metal wire I, respectively; (5) constructing a through hole between the conductive layer of the electrode sheet and one end of the conductive wire of the transmission layer, then pouring magnetic liquid metal into the through hole to connect the conductive layer of the electrode sheet and the conductive wire of the transmission layer, and finally coating a layer of silica gel solution on the upper layer of the transmission layer for encapsulation; (6) After solidification, a hole is constructed at the packaging layer position corresponding to the other end of the conductive wire of the transmission layer, and magnetic liquid metal is injected into the hole to obtain a magnetic liquid metal-based flexible electrode for electrocardiogram monitoring.

7. The method for preparing a magnetic liquid metal-based flexible electrode for electrocardiogram monitoring according to claim 6, characterized in that: The mass ratio of the silica gel solution to the magnetic liquid metal is 2:

1.

8. The method for preparing a magnetic liquid metal-based flexible electrode for electrocardiogram monitoring according to claim 6, characterized in that: Use laser marking machines to create vias and holes.

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