Stretchable lead wire and preparation method and application thereof

Abstract

The invention relates to the technical field of lead wires, in particular to a stretchable lead wire and a preparation method and application thereof. According to the stretchable lead wire, the stretchable lead wire comprises an elastic lead core wire and a first insulating layer arranged on the outer surface of the elastic lead core wire in a surrounding mode, the elastic lead core wire comprises first resin and a conductive additive dispersed in the first resin, and the first insulating layer comprises second resin; the elastic modulus of the first insulating layer is lower than that of the elastic lead core wire; the provided elastic lead core wire has good conductivity and elasticity, so that the elastic lead core wire can still keep good conductivity when the elastic lead core wire is deformed under external stress; furthermore, the provided insulating layer has certain stretchability; the elasticity modulus of the insulating layer is limited to be lower, so that the elasticity of the formed insulating layer is better, and the elastic lead core wire can be protected to a certain extent in the stretching process; the prepared lead wire has a relatively good stretchable effect, and has excellent plasticity and conductivity.

Description

Technical Field

[0001] The present application belongs to the technical field of lead wires, and in particular, relates to a stretchable lead wire and a preparation method and application thereof. Background Art

[0002] With the improvement of medical level, people's requirements for their own health testing are gradually increasing. In the process of routine examination, most examination instruments need to connect the body to the instrument through ECG lead wires, and then the acquisition chip collects the human life data and transmits it to the monitor through the cable, reflecting the parameter indexes of the human heart, blood, liver, spleen, etc., so that doctors can judge the patient's disease or monitor their vital signs.

[0003] Among the current ECG signal detection devices, most of the ECG lead wires still use traditional metal conductive cables as a signal transmission method. Although the surface is covered with resin materials such as PVC and TPU, the existence of the internal metal core wire material causes the overall elasticity and stretchability of the ECG lead wire to be greatly limited. During use, the lead wire is not easy to stretch, resulting in inconvenient operation, or the electrodes inside the lead wire are not in stable contact with the human body, posing hidden dangers to patients.

[0004] In order to solve the problem that the overall elasticity and stretchability of ECG lead wires are greatly limited, a stretchable wire made by injecting liquid metal into the elastomer and another winding and weaving method are disclosed, in which conductive metal wires are wound on pre-stretched latex fiber bundles, and the pre-strain is released after weaving to achieve the stretchability of the overall structure. Although both of the above methods prepare stretchable conductive elastomers, the former has the risk of liquid metal leakage and high preparation costs, and the latter has a more complicated process and the wires are not packaged, and the stretchability is still not ideal, and the use scenarios still have certain limitations. Therefore, there is an urgent need to provide an ECG lead wire that is stretchable and easy to prepare for use. Summary of the invention

[0005] The purpose of the present application is to provide a stretchable lead wire and a preparation method and application thereof, aiming to solve the problem that the lead wire in the prior art has poor stretchability and affects its use.

[0006] In order to achieve the above application purpose, the technical solution adopted in this application is as follows:

[0007] In a first aspect, the present application provides a stretchable lead wire, which includes and is surrounded by a first insulating layer on the outer surface of an elastic lead core wire, the elastic lead core wire includes a first resin and a conductive additive dispersed in the first resin, the first insulating layer includes a second resin, and the elastic modulus of the first insulating layer is lower than the elastic modulus of the elastic lead core wire.

[0008] In a second aspect, the present application provides a method for preparing a stretchable lead wire, comprising the following steps:

[0009] The raw material of the elastic lead core wire is melted and extruded to obtain the elastic lead core wire;

[0010] A raw material for a first insulating layer containing a second resin is provided, and a coating process or a melt encapsulation process is adopted to form the first insulating layer covering the elastic lead core wire on the outer surface of the elastic lead core wire.

[0011] In a third aspect, the present application provides an ECG signal detection device, comprising a lead wire and an ECG signal detection module, wherein the ECG signal detection module is connected to the lead wire for ECG signal detection, wherein the lead wire is a stretchable lead wire or a stretchable lead wire prepared by a stretchable lead wire preparation method.

[0012] The stretchable lead wire provided in the first aspect of the present application comprises an elastic lead core wire including a first resin and a conductive additive dispersed in the first resin, thereby ensuring that the elastic lead core wire has good conductivity and elasticity, so that it can still maintain good conductivity when deformed by external force; further, the first insulating layer provided adopts a second resin, so that the first insulating layer has a certain stretchability; and the elastic modulus of the first insulating layer arranged on the outer surface of the elastic lead core wire is limited to be lower, thereby ensuring that the formed first insulating layer has better elasticity and can play a certain protective role on the elastic lead core wire during the stretching process; therefore, the prepared lead wire has a good stretchable effect, excellent plasticity and conductivity, and is conducive to wide application.

[0013] The second aspect of the present application provides a method for preparing a stretchable lead wire, which prepares an elastic lead core wire by melt-extruding the raw material of the elastic lead core wire; then a first insulating layer is prepared by a coating process or a melt encapsulation process; the first insulating layer is prepared by a coating process or a melt encapsulation process, so that the prepared first insulating layer material has strong stretchability and strong adhesion with the elastic lead core wire, which is beneficial to improving the overall elasticity of the lead wire; and the preparation process is simple and easy to operate, does not require the use of large-scale instruments and equipment, and is conducive to industrial preparation.

[0014] The third aspect of the present application provides an ECG signal detection device, including a lead wire and an ECG signal detection module. Since the lead wire used is the above-mentioned stretchable lead wire, based on the above-mentioned stretchable lead wire having good stretchable elasticity and conductivity, the electrode of the obtained ECG signal detection device has high stability in contact with the human body, good signal acquisition effect, long service life, and is conducive to reagent application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of the structure of a stretchable lead wire according to an embodiment of the present application;

[0017] Figure 2 for Figure 1 The schematic diagram of the structure of the stretchable lead wire with a shielding layer according to the embodiment of the present application is shown;

[0018] Figure 3 It is an existing elastic lead wire;

[0019] Figure 4 It is a schematic diagram of the structure of a stretchable lead wire containing sheet-shaped electrode sites in an embodiment of the present application;

[0020] Among them, the reference numerals in the figure are:

[0021] 1—elastic lead core wire; 2—first insulating layer; 3—shielding layer; 4—second insulating layer; 5—lead wire; 6—connecting part; 7—electrode. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0024] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple, respectively.

[0025] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0026] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0027] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass in the embodiment description of the present application can be μg, mg, g, kg and other mass units known in the chemical industry.

[0028] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0029] In a first aspect, an embodiment of the present application provides a stretchable lead wire, such as Figure 1 As shown, the stretchable lead wire includes an elastic lead core wire 1 and a first insulating layer 2 arranged around the outer surface of the elastic lead core wire 1, the elastic lead core wire 1 includes a first resin and a conductive additive dispersed in the first resin; the first insulating layer 2 includes a second resin, and the elastic modulus of the first insulating layer 2 is lower than the elastic modulus of the elastic lead core wire 1.

[0030] The stretchable lead wire provided in the first aspect of the embodiment of the present application comprises an elastic lead core wire 1 including a first resin and a conductive additive dispersed in the first resin, thereby ensuring that the elastic lead core wire 1 has good conductivity and elasticity, so that it can still maintain good conductivity when deformed by external force; further, the provided first insulating layer 2 adopts a second resin, so that the first insulating layer 2 has a certain stretchability; and the elastic modulus of the first insulating layer 2 arranged on the outer surface of the elastic lead core wire 1 is limited to be lower, thereby ensuring that the formed first insulating layer 2 has better elasticity and can play a certain protective role on the elastic lead core wire 1 during the stretching process; therefore, the prepared lead wire has a good stretchable effect, excellent plasticity and conductivity, and is conducive to wide application.

[0031] The stretchable lead wire includes an elastic lead core wire 1. It can be understood that the elastic lead core wire 1 has conductive properties. In the embodiment, the cross-sectional shape of the elastic lead core wire 1 is arbitrary. The cross-sectional shape of the elastic lead core wire 1 can be selected according to actual needs, including but not limited to circular, rectangular, square, and pentagonal.

[0032] Most of the current ECG lead detection devices still use traditional metal conductive cables as a signal transmission method. Although the surface is covered with resin materials such as PVC and TPU, the elasticity and stretchability are greatly limited due to the existence of the internal metal core wire material.

[0033] Therefore, in the lead wire provided by the present application, the elastic lead core wire 1 includes a first resin and a conductive additive dispersed in the first resin. By dispersing the conductive additive in the first resin substrate, the conductive additive can form a conductive network inside the elastic lead core wire 1, so that the obtained elastic lead core wire 1 can still maintain good conductivity when deformed by external force. Although the relevant resistance increases when it is in a stretched state, the change amplitude is much smaller than the human body impedance and does not affect signal acquisition.

[0034] In some embodiments, the raw materials of the elastic lead core wire 1 include the following components in parts by weight:

[0035]

[0036] The elastic lead core wire 1 is mainly composed of resin, including 60 to 90 parts of the first resin, and the obtained elastic lead core wire 1 has a certain degree of stretchability. In some specific embodiments, the number of added parts of the first resin in the elastic lead core wire 1 includes but is not limited to 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, and 90 parts.

[0037] In some embodiments, the first resin includes at least one of polyurethane, silicone rubber, silicone rubber polyester, polyolefin elastomer, and rubber elastomer.

[0038] The elastic lead core wire 1 is based on the first resin as the base material, and a conductive additive is added in an amount of 5 to 35 parts by weight. The provided conductive additive is dispersed in the first resin, and the conductive additive can form a conductive network inside the resin, so that it can still maintain good conductivity when it is deformed by external force. Therefore, the elastic lead core wire 1 obtained by mixing "resin and conductive additive" not only has excellent conductivity and certain stretchability, but also can ensure that the conductive performance is excellent when the material is in a stretched state. In some specific embodiments, in the elastic lead core wire 1, the number of conductive additives added includes but is not limited to 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, and 30 parts.

[0039] In some embodiments, the conductive additive includes at least one of carbon nanotubes, nanoscale carbon black, graphene, short carbon fibers, graphite, MXene, metal nanowires, and alloy particles. In some specific embodiments, when the conductive additive provided is carbon nanotubes, the provided carbon nanotubes are selected from carbon nanotubes with a diameter of 2 to 50 nm and a length of 50 to 500 μm; when the conductive additive provided is nanoscale carbon black, the provided nanoscale carbon black is selected from nanoscale carbon black with a particle size of 10 to 100 nm; when the conductive additive provided is graphene, the provided graphene is selected from graphene with a 1 to 10 layer structure; when the conductive additive provided is carbon nanotubes, when the provided conductive material is graphite, the provided graphite is selected from graphite with a mesh size of 500 to 3000.

[0040] In some embodiments, the conductive additive includes at least one one-dimensional conductive additive; the one-dimensional conductive additive provided is selected from linear conductive additives, and the linear conductive additives can be connected with other conductive additives. In some embodiments, at least part of the conductive additives form a conductive island bridge structure, which means that the conductive additives of some particles are connected by one-dimensional conductive additives, and the one-dimensional conductive additives form a "bridge" structure, which is used to connect the particle conductive additives forming the "island" structure; so that the conductive additives with a smaller content have better conductive properties, and when external tension acts, the internal conductive particles will also slide, but the presence of the one-dimensional conductive additive can retain the integrity and stability of the conductive network to the greatest extent, thereby having better tensile conductivity.

[0041] Furthermore, the conductive additives provided have different shapes and different dispersibility when dispersed in the resin. Therefore, the number of conductive additives added needs to be determined according to their specific types to ensure that the added conductive additives can build a conductive network in the resin material.

[0042] The elastic lead core wire 1 is based on the first resin as the base material, and a coupling agent of 1 to 3 parts by weight is added. The main purpose of adding the coupling agent is to improve the coupling effect between the resin and the conductive material, and to ensure that the elastic lead core wire 1 has an excellent conductive effect as a whole. In some specific embodiments, the number of added coupling agents includes but is not limited to 1 part, 1.5 parts, 2 parts, 2.5 parts, and 3 parts.

[0043] In some embodiments, the coupling agent includes at least one of a silane coupling agent and a phthalate coupling agent.

[0044] The elastic lead wire 1 is based on the first resin as the base material, and other additives are added in 1-2 parts by weight. The other additives are mainly selected according to the actual preparation conditions. In some embodiments, the other additives include at least one of an antioxidant, a light stabilizer, and a plasticizer.

[0045] In some embodiments, the diameter of the elastic lead core wire 1 is 1 to 2 mm. The diameter of the elastic lead core wire 1 can be determined according to actual conditions. In some specific embodiments, the diameter of the elastic lead core wire 1 includes but is not limited to 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, and 2.0 mm.

[0046] Further, the elastic lead wire 1 includes a conductive additive and a first resin, and the first insulating layer 2 includes a second resin; the first insulating layer 2 is provided with the second resin, so that the first insulating layer 2 has a certain stretchability. In some embodiments, the second resin includes at least one of polyurethane, silicone rubber, silicone rubber polyester, polyolefin elastomer, and rubber elastomer.

[0047] In order to ensure that the prepared lead wire has excellent stretchability as a whole, it is necessary to control the first insulating layer 2 to also have a certain elasticity, and the elastic modulus of the first insulating layer 2 is lower than the elastic modulus of the elastic lead core wire 1.

[0048] Furthermore, the elastic modulus of the first insulating layer 2 is lower than the elastic modulus of the elastic lead core wire 1. The lower the elastic modulus of the prepared first insulating layer 2, the greater the elasticity, and the more it can protect the elastic lead core wire 1 during the stretching process; when a large stretching force is used for stretching, since the elasticity of the first insulating layer 2 is greater than the elasticity of the elastic lead core wire 1 material, the first insulating layer 2 material is not easy to break, and can effectively protect the elastic lead core wire 1.

[0049] In some embodiments, the elastic modulus of the first insulating layer 2 differs from the elastic modulus of the elastic lead core wire 1 by 30% to 300%. Controlling the elastic modulus of the first insulating layer 2 to be 30% to 300% lower than the elastic modulus of the elastic lead core wire 1 can ensure that both the first insulating layer 2 and the elastic lead core wire 1 have a certain tensile strength, and ensure that the difference in tensile strength between the two is not too large, so that the overall tensile property of the obtained lead wire is excellent. In some specific embodiments, the first insulating layer 2 can be selected from an elastic modulus lower than the elastic modulus of the elastic lead core wire 1 by 30%, 50%, 80%, 100%, 130%, 150%, 180%, 200%, 230%, 250%, 280%, 300%.

[0050] Furthermore, the compatibility degree deviation between the first insulating layer 2 and the elastic lead core wire 1 is 0% to 50%. The compatibility degree deviation between the first insulating layer 2 and the elastic lead core wire 1 is controlled to be small, ensuring that the first insulating layer 2 and the elastic lead core wire 1 material have good compatibility, ensuring that the elastic lead core wire 1 is not easy to break under tension, and ensuring effective signal collection. Compatibility refers to the ability of the components of the blend to accommodate each other and form a macroscopic uniform material. For resin materials, good compatibility is mainly considered from three aspects: polarity, solubility and surface tension; the first insulating layer 2 is used to have good compatibility with the elastic lead core wire 1, which can ensure that the properties of the two are similar and achieve a mutual matching effect, which is conducive to improving the overall elasticity of the lead wire; and ensure that under high-intensity tension, the first insulating layer 2 and the elastic lead core wire 1 achieve good bonding, and the first insulating layer 2 and the elastic lead core wire 1 will not separate, which is conducive to controlling the deformation of the two to be in a similar range, thereby improving the overall use effect of the lead wire.

[0051] It can be understood that if the first insulating layer 2 and the elastic lead core wire 1 are made of the same material, the compatibility deviation between the two is substantially 0. In actual use, since the properties of the first insulating layer 2 and the elastic lead core wire 1 need to be further considered, the compatibility deviation between the first insulating layer 2 and the elastic lead core wire 1 is controlled to be 10% to 50%.

[0052] In some embodiments, the compatibility deviation between the first insulating layer 2 and the elastic lead core wire 1 includes at least one of the following:

[0053] Polarity deviation between the first insulating layer 2 and the elastic lead core wire 1;

[0054] solubility deviation between the first insulating layer 2 and the elastic lead core wire 1;

[0055] The surface tension between the first insulating layer 2 and the elastic lead core wire 1 is biased.

[0056] Among them, the polarity deviation between the first insulating layer 2 and the elastic lead core wire 1 is 0% to 50%; controlling the polarity deviation of the two materials to be small can ensure that the two materials have similar polarities, can achieve a state of "like dissolves like", and effectively improve the overall tensile properties of the obtained lead wire. In some implementations, the polarity deviation between the first insulating layer 2 and the elastic lead core wire 1 is 10% to 50%. In some specific embodiments, the polarity deviation of the first insulating layer 2 and the elastic lead core wire 1 can be selected from, but is not limited to, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, and 50%.

[0057] Among them, the solubility deviation between the first insulating layer 2 and the elastic lead core wire 1 is 0% to 50%. Solubility refers to the mass of resin that can be dissolved in a unit volume of solvent at a certain temperature and pressure; generally speaking, different materials have different actual solubilities due to their different molecular weights, intermolecular forces, and groups carried. Therefore, ensuring that the solubility deviation between the first insulating layer 2 and the elastic lead core wire 1 is small can ensure that the differences in molecular weight, intermolecular forces, and groups carried by the two materials are small, which is conducive to the matching of the two materials. It should be clear that the solubility provided refers to the solubility value of the first insulating layer 2 and the elastic lead core wire 1 under the same temperature and pressure conditions.

[0058] In some embodiments, the solubility deviation between the first insulating layer 2 and the elastic lead core wire 1 at room temperature is 10% to 50%. In some specific embodiments, the solubility deviation between the first insulating layer 2 and the elastic lead core wire 1 can be selected from, but not limited to, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, and 50%.

[0059] Among them, the surface tension deviation between the first insulating layer 2 and the elastic lead core wire 1 is 0% to 50%. Different materials will cause different surface tensions at different locations due to their differences in structure, molecular weight and density. Selecting two materials with a smaller surface tension deviation will make the surface activity of the mixed interface of the two materials smaller, thereby improving the compatibility of the contact surface of the two components. In some embodiments, the surface tension deviation between the first insulating layer 2 and the elastic lead core wire 1 is 10% to 50%. In some specific embodiments, the surface tension deviation of the first insulating layer 2 and the elastic lead core wire 1 can be selected from, including but not limited to 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%.

[0060] In some embodiments, the melting point of the second resin is lower than the melting point of the first resin. The melting point of the second resin is controlled to be lower than the melting point of the first resin to ensure that the first insulating layer 2 can be processed by a melt encapsulation method without causing damage to the elastic lead core wire 1.

[0061] In some embodiments, the melting point temperature of the second resin differs from the melting point temperature of the first resin by 10°C to 100°C; the melting point temperature of the second resin is controlled to be 10°C to 100°C lower than the melting point temperature of the first resin, which can ensure that there is a difference in the stretchability of the first insulating layer 2 and the elastic lead core wire 1, and ensure that the difference in tensile strength between the two is not too large, and ensure that the elastic lead core wire 1 will not be damaged during the preparation process using the melt encapsulation process. In some specific implementations, the second resin can be selected from materials having a melting point temperature lower than the melting point temperature of the first resin, including but not limited to 10°C, 20°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, and 100°C.

[0062] In some embodiments, Figure 2 As shown, the stretchable lead wire also includes: a shielding layer 3, which is arranged around the outer surface of the first insulating layer 2. The shielding layer 3 can be arranged according to specific requirements, and the preparation of the shielding layer 3 is beneficial to reduce the influence of the external electromagnetic field on the power supply or communication line. In addition, in the process of providing the shielding layer 3, the elastic modulus of the selected shielding layer 3 needs to be considered, and the elastic modulus of the shielding layer 3 needs to be controlled to be smaller than the elastic modulus of the elastic lead core wire 1.

[0063] In some embodiments, the shielding layer 3 is selected from a conductive carbon paste. Since it includes carbon material, the elastic modulus of the shielding layer 3 obtained is slightly larger than the elastic modulus of the insulating layer 2, but the thickness of the shielding layer 3 can be controlled to be thinner to control the elastic modulus of the shielding layer 3 to be smaller than the elastic modulus of the elastic lead core wire 1.

[0064] In some embodiments, the thickness of the shielding layer 3 is 20 to 100 μm. In the specific operation process, the thickness of the shielding layer 3 can be selected according to specific requirements. Specifically, the elastic modulus of the shielding layer 3 can be controlled by controlling the thickness of the shielding layer 3. In some specific embodiments, the thickness of the shielding layer 3 includes but is not limited to 20 μm, 3.0 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, and 100 μm.

[0065] In some embodiments, a second insulating layer 4 is further provided on the outer surface of the shielding layer 3, wherein the elastic modulus of the second insulating layer 4 is lower than the elastic modulus of the first insulating layer 2. The elastic modulus of the second insulating layer 4 provided on the outermost surface is controlled to be lower than the elastic modulus of the first insulating layer 2, so as to ensure that the formed second insulating layer 4 has better elasticity and can provide a certain protection to each layer during the stretching process.

[0066] In some embodiments, the elastic modulus of the first insulating layer 2 differs from the elastic modulus of the second insulating layer 4 by 30% to 300%. In some specific embodiments, the second insulating layer 4 can be selected from the elastic modulus lower than the elastic modulus of the first insulating layer 2 by 30%, 50%, 80%, 100%, 130%, 150%, 180%, 200%, 230%, 250%, 280%, 300%.

[0067] Furthermore, since the shielding layer is provided between the first insulating layer 2 and the second insulating layer 4, the first insulating layer 2 and the shielding layer, and the second insulating layer 4 and the shielding layer all need to ensure a certain good compatibility, thereby ensuring that there will be no breakage and delamination between the layers during the stretching process, thereby improving the overall tensile performance of the lead wire.

[0068] In one embodiment, the first insulating layer 2 and the shielding layer are guaranteed to have a certain good compatibility.

[0069] In some embodiments, the compatibility degree deviation between the first insulating layer 2 and the shielding layer is 0% to 50%.

[0070] In some embodiments, the compatibility degree deviation between the first insulating layer 2 and the shielding layer includes at least one of the following;

[0071] Polarity deviation of the first insulating layer 2 and the shielding layer;

[0072] Solubility deviation of the first insulating layer 2 and the shielding layer;

[0073] The surface tension of the first insulating layer 2 and the shielding layer deviates.

[0074] The polarity deviation between the first insulating layer 2 and the shielding layer is 0% to 50%. In some embodiments, the polarity deviation between the first insulating layer 2 and the shielding layer is 10% to 50%.

[0075] The solubility deviation of the first insulating layer 2 and the shielding layer is 0% to 50%; in some embodiments, the solubility deviation of the first insulating layer 2 and the shielding layer is 10% to 50%. The solubility refers to the solubility at the same temperature and the same pressure.

[0076] The surface tension deviation between the first insulating layer 2 and the shielding layer is 0% to 50%. In some embodiments, the surface tension deviation between the first insulating layer 2 and the shielding layer is 10% to 50%.

[0077] In some embodiments, the melting point temperature of the shielding layer is lower than the melting point temperature of the first insulating layer 2. Controlling the melting point temperature of the shielding layer to be relatively low is conducive to preparing the shielding layer by the method of melt encapsulation without affecting the first insulating layer 2 or the elastic lead core wire 1. In some embodiments, the melting point temperature of the shielding layer is lower than the melting point temperature of the first insulating layer 2, including but not limited to 10°C, 20°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C.

[0078] In another embodiment, the second insulating layer 4 and the shielding layer are guaranteed to have certain good compatibility.

[0079] In some embodiments, the compatibility degree deviation between the second insulating layer 4 and the shielding layer is 0% to 50%.

[0080] In some embodiments, the compatibility degree deviation between the second insulating layer 4 and the shielding layer includes at least one of the following;

[0081] Polarity deviation of the second insulating layer 4 and the shielding layer;

[0082] Solubility deviation of the second insulating layer 4 and the shielding layer;

[0083] The surface tension of the second insulating layer 4 and the shielding layer deviates.

[0084] The polarity deviation between the second insulating layer 4 and the shielding layer is 0% to 50%. In some embodiments, the polarity deviation between the second insulating layer 4 and the shielding layer is 10% to 50%.

[0085] The solubility deviation of the second insulating layer 4 and the shielding layer is 0% to 50%; in some embodiments, the solubility deviation of the second insulating layer 4 and the shielding layer is 10% to 50%. The solubility refers to the solubility at the same temperature and pressure.

[0086] The surface tension deviation between the second insulating layer 4 and the shielding layer is 0% to 50%. In some embodiments, the surface tension deviation between the second insulating layer 4 and the shielding layer is 10% to 50%.

[0087] In some embodiments, the melting point temperature of the second insulating layer 4 is lower than the melting point temperature of the shielding layer. Controlling the melting point temperature of the second insulating layer 4 to be relatively low is conducive to preparing the second insulating layer 4 by the method of melt encapsulation without affecting the shielding layer or the first insulating layer 2 or the elastic lead core wire 1. In some embodiments, the melting point temperature of the second insulating layer 4 is lower than the melting point temperature of the shielding layer, including but not limited to 10°C, 20°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C.

[0088] In some embodiments, the total thickness of all insulating layers is 0.2 to 1 mm. The total thickness of all insulating layers can be further selected according to specific requirements. In some specific embodiments, the total thickness of all insulating layers includes but is not limited to 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1 mm.

[0089] In some embodiments, Figure 4 As shown, the stretchable lead wire also includes: an electrode 7 or a connecting portion 6 is arranged at the end of the stretchable lead wire 5, wherein the electrode 7 or the connecting portion 6 is electrically connected to the elastic lead core wire 1. In one embodiment, the arranged electrode 7 is conducive to connection with other lead devices, and is conducive to processing into various shapes for adaptation. Compared with the buckling method of traditional electrodes, a variety of electrode site connection methods such as patch, bonding, and heat sealing can be realized. In another embodiment, if it is set as a connecting portion 6, the connecting portion 6 includes a connection for the electrode 7 or a connection with other wires.

[0090] In some embodiments, the overall elastic modulus of the stretchable lead wire is 0.1 to 10 MPa, ensuring that the prepared lead wire has good stretchable elastic effect, excellent plasticity and conductivity, and at the same time ensuring that during the stretching process of the lead wire, the elastic lead core wire 1 and the insulating layer 2 have a high degree of matching, will not be damaged due to excessive stretching, will not affect signal acquisition, and is conducive to wide application.

[0091] In some specific embodiments, the overall elastic modulus of the stretchable lead wire includes but is not limited to 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1.0 MPa, 2.0 MPa, 2.5 MPa, 3 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, 5 MPa, 5.5 MPa, 6 MPa, 6.5 MPa, 7 MPa, 7.5 MPa, 8 MPa, 8.5 MPa, 9 MPa, 9.5 MPa, and 10 MPa.

[0092] A second aspect of an embodiment of the present application provides a method for preparing a stretchable lead wire, comprising the following steps:

[0093] S01. The raw material of the elastic lead core wire is melt-extruded to obtain an elastic lead core wire 1;

[0094] S02. Providing a raw material for the first insulating layer 2 containing a second resin, and using a coating process or a melt encapsulation process to form the first insulating layer 2 covering the elastic lead core wire 1 on the outer surface of the elastic lead core wire 1 .

[0095] The second aspect of the embodiment of the present application provides a method for preparing a stretchable lead wire. The method prepares the elastic lead core wire 1 by melt-extruding the raw material of the elastic lead core wire 1; then prepares the first insulating layer 2 by adopting a coating process or a melt encapsulation process; the first insulating layer 2 is prepared by adopting a coating process or a melt encapsulation process, so that the prepared first insulating layer 2 material has strong stretchability and strong bonding with the elastic lead core wire 1, which is beneficial to improving the overall elasticity of the lead wire; and the preparation process is simple and easy to operate, does not require the use of large-scale instruments and equipment, and is conducive to industrial preparation.

[0096] In step S01 , the raw material of the elastic lead core wire 1 is melt-extruded to obtain the elastic lead core wire 1 .

[0097] The raw material components and their addition amounts of the elastic lead wire 1 are as described above, and will not be described here in order to save space. The relevant resistors can be formulated according to the content ratio of the conductive particles.

[0098] In some embodiments, the temperature at which the raw material of the elastic lead core wire 1 melts is determined according to the first resin of the elastic lead core wire 1 used.

[0099] In some embodiments, in the step of melt-extruding the raw material of the elastic lead core wire 1, a twin-screw extruder granulator is used for extrusion molding to obtain the elastic lead core wire 1. By extrusion molding, elastic lead core wires 1 of different diameters and lengths can be prepared.

[0100] In some embodiments, the step of melt-extruding the raw material of the elastic lead core wire 1 may further include: cooling and granulating the melted raw material to obtain elastic lead core wire 1 particles, and then extruding the elastic lead core wire 1 particles.

[0101] In step S02 , a raw material of an insulating layer 2 containing a second resin is provided, and a coating process or a melt encapsulation process is used to form a first insulating layer 2 covering the elastic lead core wire 1 on the outer surface of the elastic lead core wire 1 .

[0102] In some embodiments, the step of forming the first insulating layer 2 covering the elastic lead core wire 1 on the outer surface of the elastic lead core wire 1 by a coating process includes: first dissolving the resin material of the first insulating layer 2 into a resin solution, and then coating the resin solution.

[0103] In some embodiments, the coating process includes but is not limited to dipping, spraying, blade coating and other coating processes.

[0104] In some embodiments, the step of forming the first insulating layer 2 covering the elastic lead core wire 1 on the outer surface of the elastic lead core wire 1 by using a melt encapsulation process includes: encapsulating the elastic lead core wire 1 with the material of the first insulating layer 2. When the resin melt encapsulation process is selected, the processing temperature of the selected encapsulation resin needs to be lower than the processing temperature of the encapsulated substrate to avoid damage to the internal structure.

[0105] A third aspect of an embodiment of the present application provides an ECG signal detection device, comprising a lead wire and an ECG signal detection module, wherein the ECG signal detection module is connected to the lead wire for ECG signal detection, wherein the lead wire is the above-mentioned stretchable lead wire or a stretchable lead wire prepared by a stretchable lead wire preparation method.

[0106] The ECG signal detection device provided in the third aspect of the embodiment of the present application includes a lead wire and an ECG signal detection module. Since the lead wire used is the above-mentioned stretchable lead wire, based on the above-mentioned stretchable lead wire having good stretchable elasticity and conductivity, the obtained ECG signal detection device has high signal transmission quality, good signal acquisition effect, long service life, and is conducive to reagent application.

[0107] The following describes the invention in conjunction with specific embodiments.

[0108] Example 1

[0109] The present embodiment is a stretchable lead wire and a preparation method thereof. The stretchable lead wire comprises an elastic lead core wire 1 and an insulating layer 2 arranged around the outer surface of the elastic lead core wire 1; wherein the raw materials of the elastic lead core wire 1 include: 100 parts of thermoplastic polyurethane (TPU), 5 parts of multi-walled carbon nanotubes (MWNT), 20 parts of 3000 mesh conductive graphite, 10 parts of nano conductive carbon black, 2 parts of coupling agent, and 1 part of plasticizer; the melting point of the thermoplastic polyurethane of the elastic lead core wire 1 is 180°C and the elastic modulus is 4Mpa; the insulating layer 2 is selected from thermoplastic polyurethane with a melting point of 120°C and an elastic modulus of 2.5MPa.

[0110] The preparation method comprises: blending the raw materials of the elastic lead core wire 1 through an internal mixer at a maximum temperature of 200°C, then cooling and crushing them into particles, and obtaining a conductive masterbatch through a twin-screw extrusion granulation mechanism at a processing temperature range of 170°C-210°C; using the prepared conductive masterbatch through a horizontal extrusion process at 160°C-200°C to obtain an elastic lead core wire 1 with a diameter of 1.5 mm, cutting off 0.5 m of the elastic lead core wire, leaving 2 cm at each end for subsequent processing;

[0111] Then, the injection molding process is used to select the insulating layer 2 material to perform the molding process on the middle area of ​​the outer surface of the elastic lead core wire 1. After the injection molding process, the lead wire diameter is 2 mm.

[0112] Example 2

[0113] The present embodiment provides a stretchable lead wire and a preparation method thereof. The stretchable lead wire comprises an elastic lead core wire 1 and an insulating layer 2 arranged around the outer surface of the elastic lead core wire 1; wherein the raw materials of the elastic lead core wire 1 include: 100 parts of thermoplastic polyurethane (TPU), 5 parts of multi-walled carbon nanotubes (MWNT), 20 parts of 3000 mesh conductive graphite, 10 parts of nano-conductive carbon black, 2 parts of coupling agent, and 1 part of plasticizer; the melting point of the thermoplastic polyurethane of the elastic lead core wire 1 is 180°C and the elastic modulus is 4MPa; the insulating layer 2 is selected from a thermoplastic polyurethane with a melting point of 120°C and an elastic modulus of 2.5MPa; and the polarity and solubility of the resin provided by the elastic lead core wire and the resin provided by the insulating layer are the same, and the surface tension related properties are similar.

[0114] The preparation method comprises: blending the raw materials of the elastic lead core wire 1 through an internal mixer at a maximum temperature of 200°C, then cooling and crushing them into particles, and obtaining a conductive masterbatch through a twin-screw extrusion granulation mechanism at a processing temperature range of 170°C-210°C; using the prepared conductive masterbatch through a horizontal extrusion process at 160°C-200°C to obtain an elastic lead core wire 1 with a diameter of 1.5 mm, cutting off 0.5 m of the elastic lead core wire, leaving 2 cm at each end for subsequent processing;

[0115] Then, the injection molding process is used to select the insulating layer 2 material to perform the molding process on the middle area of ​​the outer surface of the elastic lead core wire 1. After the injection molding process, the lead wire diameter is 2 mm.

[0116] Example 3

[0117] The present embodiment of the stretchable lead wire and the preparation method thereof include an elastic lead wire 1, a first insulating layer 2 is arranged around the outer surface of the elastic lead wire 1, a shielding layer 3 is arranged around the outer surface of the first insulating layer 2, and a second insulating layer 4 is arranged around the outer surface of the shielding layer 3. Among them, the raw materials of the elastic lead core wire 1 include: 100 parts of thermoplastic polyurethane (TPU), 10 parts of multi-walled carbon nanotubes (MWNT), 25 parts of 3000 mesh conductive graphite, 10 parts of nano conductive carbon black, 2 parts of coupling agent, and 1 part of plasticizer; the melting point of the thermoplastic polyurethane of the elastic lead core wire 1 is 180°C, and the elastic modulus is 6MPa. The first insulating layer 2 is a thermoplastic polyurethane material with a melting point of 140°C and an elastic modulus of 4MPa; the second insulating layer 4 is a polyurethane resin solution, and the relevant elastic modulus after curing is 2.5MPa; the shielding layer 3 is a conductive carbon paste, which is a polyurethane resin base mixed with a conductive substance. It is liquid at room temperature and can be cured under a curing condition of 120°C.

[0118] The preparation method comprises: blending the raw materials of the elastic lead core wire 1 by using an internal mixer at a maximum temperature of 220°C, then cooling and crushing them into particles, and obtaining conductive masterbatch by a twin-screw extrusion granulation mechanism at a processing temperature range of 180°C-230°C, and then obtaining an elastic lead core wire 1 with a diameter of 1.2 mm by using a horizontal extrusion process at a temperature of 180°C-220°C, cutting off 0.5 m of the elastic lead core wire, and reserving 2 cm at both ends for subsequent processing;

[0119] By using the injection molding process, a TPU resin with a melting point of 120°C is selected to perform a coating treatment on the middle area of ​​the elastic lead wire 1 to prepare a first insulating layer 2. After the injection molding process, the lead wire has a diameter of 1.2 mm.

[0120] Provide conductive carbon paste, and form a shielding layer 3 on the outer surface of the first insulating layer 2 by a dip coating process, with a thickness of about 50 μm;

[0121] A cyclic impregnation-curing temperature process is adopted, and a resin is selected to perform encapsulation treatment on the middle area of ​​the outer surface of the shielding layer 3 to prepare the second insulating layer 4. After the injection molding, the lead wire diameter is 2 mm.

[0122] In the obtained stretchable lead wire, the overall elastic modulus size distribution is elastic lead core wire 1>shielding layer 3>first insulating layer 2>second insulating layer 4, and the thickness size is elastic lead core wire 1>second insulating layer 4>first insulating layer 2>shielding layer 3.

[0123] Example 4

[0124] The present embodiment of the stretchable lead wire and the preparation method thereof include an elastic lead wire 1, a first insulating layer 2 is arranged around the outer surface of the elastic lead wire 1, a shielding layer 3 is arranged around the outer surface of the first insulating layer 2, and a second insulating layer 4 is arranged around the outer surface of the shielding layer 3. Among them, the raw materials of the elastic lead core wire 1 include: 100 parts of thermoplastic polyurethane (TPU), 10 parts of multi-walled carbon nanotubes (MWNT), 25 parts of 3000 mesh conductive graphite, 10 parts of nano conductive carbon black, 2 parts of coupling agent, and 1 part of plasticizer; the first insulating layer 2 is selected from the same series of polyurethane resins that have good compatibility with the thermoplastic polyurethane in the elastic lead core wire 1, and the polarity and solubility parameters of the two are the same, and the surface tension is similar; the second insulating layer 4 is selected from the same series of polyurethane resin solutions that have good compatibility with the polyurethane resin in the inner insulating layer 21 for processing, and the polarity and solubility of the two are almost the same. After processing, the surface tension-related deviation is less than 10%; the shielding layer 3 is conductive carbon slurry, which is a polyurethane resin base material mixed with a conductive substance, is liquid at room temperature, and can be cured under a curing condition of 120°C.

[0125] The preparation method comprises: blending the raw materials of the elastic lead core wire 1 by using an internal mixer at a maximum temperature of 220° C., then cooling and crushing them into particles, and obtaining conductive masterbatch by a twin-screw extrusion granulation mechanism at a processing temperature range of 180° C.-230° C., and then obtaining the elastic lead core wire 1 with a diameter of 1.2 mm by using a horizontal extrusion process at a temperature of 180° C.-220° C., cutting off 0.5 m of the elastic lead core wire, and reserving 2 cm at both ends for subsequent processing;

[0126] By using the injection molding process, a TPU resin with a melting point of 120°C is selected to perform a coating treatment on the middle area of ​​the elastic lead wire 1 to prepare a first insulating layer 2. After the injection molding process, the lead wire has a diameter of 1.2 mm.

[0127] Provide conductive carbon paste, and form a shielding layer 3 on the outer surface of the first insulating layer 2 by a dip coating process, with a thickness of about 50 μm;

[0128] A cyclic impregnation-curing temperature process is adopted, and a resin is selected to perform encapsulation treatment on the middle area of ​​the outer surface of the shielding layer 3 to prepare the second insulating layer 4. After the injection molding, the lead wire diameter is 2 mm.

[0129] In the obtained stretchable lead wire, the overall elastic modulus size distribution is elastic lead core wire 1>shielding layer 3>first insulating layer 2>second insulating layer 4, and the thickness size is elastic lead core wire 1>second insulating layer 4>first insulating layer 2>shielding layer 3.

[0130] Example 5

[0131] The present embodiment is a stretchable lead wire and a preparation method thereof. The stretchable lead wire comprises an elastic lead core wire 1 and an insulating layer 2 arranged around the outer surface of the elastic lead core wire 1; wherein the raw materials of the elastic lead core wire 1 include: 100 parts of thermoplastic polyurethane (TPU), 5 parts of multi-walled carbon nanotubes (MWNT), 20 parts of 3000 mesh conductive graphite, 10 parts of nano conductive carbon black, 2 parts of coupling agent, and 1 part of plasticizer; the melting point of the thermoplastic polyurethane of the elastic lead core wire 1 is 180°C and the elastic modulus is 4MPa; the insulating layer 2 is selected from thermoplastic polyurethane with a melting point of 120°C and an elastic modulus of 2.5MPa. The selected core wire and the insulating layer belong to the same series of resins, and the resin provided by the elastic lead core wire and the resin provided by the insulating layer have the same polarity and solubility, and similar surface tension.

[0132] The preparation method comprises: blending the raw materials of the elastic lead core wire 1 through an internal mixer at a maximum temperature of 200°C, then cooling and crushing them into particles, and obtaining a conductive masterbatch through a twin-screw extrusion granulation mechanism at a processing temperature range of 170°C-210°C; using the prepared conductive masterbatch through a horizontal extrusion process at 160°C-200°C to obtain an elastic lead core wire 1 with a diameter of 1.5 mm, cutting off 0.5 m of the elastic lead core wire, leaving 2 cm at each end for subsequent processing;

[0133] Then, the injection molding process is used to select the insulating layer 2 material to perform the encapsulation treatment on the middle area of ​​the outer surface of the elastic lead core wire 1. After the injection molding process, the lead wire diameter is 2 mm.

[0134] The reserved elastic lead wire 1 is hot-pressed into a circular sheet with a thickness of 0.4 mm and a diameter of 1 cm by a mold to obtain a stretchable lead wire containing sheet-shaped electrode sites (such as Figure 4 ), compared with conventional elastic lead wires (such as Figure 3 Compared with the above (as shown in the figure), the stretchable lead wire containing sheet-like electrode sites directly contacts the human body by fixing the patch with medical tape to directly collect signals.

[0135] Comparative Example 1

[0136] The lead wire of this embodiment uses a metal conductive cable as an elastic lead core wire, and then uses TPU resin to coat it to prepare an insulating layer to obtain the lead wire.

[0137] Comparative Example 2

[0138] The lead wire of this embodiment. The stretchable lead wire includes an elastic lead core wire 1 and an insulating layer 2 arranged around the outer surface of the elastic lead core wire 1; wherein the raw materials of the elastic lead core wire 1 include: 100 parts of thermoplastic polyurethane (TPU), 3 parts of multi-walled carbon nanotubes (MWNT), 10 parts of 3000 mesh conductive graphite, 5 parts of nano conductive carbon black, 2 parts of coupling agent, and 1 part of plasticizer; the melting point of the thermoplastic polyurethane of the elastic lead core wire 1 is 180°C and the elastic modulus is 4MPa; the insulating layer 2 is selected from thermoplastic polyurethane with a melting point of 120°C and an elastic modulus of 2.5MPa.

[0139] The preparation method comprises: blending the raw materials of the elastic lead core wire 1 through an internal mixer at a maximum temperature of 200°C, then cooling and crushing them into particles, and obtaining a conductive masterbatch through a twin-screw extrusion granulation mechanism at a processing temperature range of 170°C-210°C; using the prepared conductive masterbatch through a horizontal extrusion process at 160°C-200°C to obtain an elastic lead core wire 1 with a diameter of 1.5 mm, cutting off 0.5 m of the elastic lead core wire, leaving 2 cm at each end for subsequent processing;

[0140] Then, the injection molding process is used to select the insulating layer 2 material to perform the molding process on the middle area of ​​the outer surface of the elastic lead core wire 1. After the injection molding process, the lead wire diameter is 2 mm.

[0141] Comparative Example 3

[0142] The present embodiment provides a stretchable lead wire and a preparation method thereof. The stretchable lead wire comprises an elastic lead core wire 1 and an insulating layer 2 arranged around the outer surface of the elastic lead core wire 1; wherein the raw materials of the elastic lead core wire 1 include: 100 parts of thermoplastic polyurethane (TPU), 5 parts of multi-walled carbon nanotubes (MWNT), 20 parts of 3000 mesh conductive graphite, 10 parts of nano-conductive carbon black, 2 parts of coupling agent, and 1 part of plasticizer; the melting point of the thermoplastic polyurethane of the elastic lead core wire 1 is 180°C and the elastic modulus is 4MPa; the insulating layer 2 is selected from a thermoplastic polyurethane with a melting point of 120°C and an elastic modulus of 2.5MPa; and the polarity and solubility of the resin provided by the elastic lead core wire and the resin provided by the insulating layer are the same, and the surface tension related properties are similar.

[0143] The preparation method comprises: blending the raw materials of the elastic lead core wire 1 through an internal mixer at a maximum temperature of 200°C, then cooling and crushing them into particles, and obtaining a conductive masterbatch through a twin-screw extrusion granulation mechanism at a processing temperature range of 170°C-210°C; using the prepared conductive masterbatch through a horizontal extrusion process at 160°C-200°C to obtain an elastic lead core wire 1 with a diameter of 2mm, cutting off 0.5m of the elastic lead core wire, leaving 2cm at each end for subsequent processing;

[0144] Then, the injection molding process is used to select the insulating layer 2 material to perform the molding process on the middle area of ​​the outer surface of the elastic lead core wire 1. After the injection molding process, the lead wire diameter is 2.5 mm.

[0145] Comparative Example 4

[0146] The present embodiment of the stretchable lead wire and the preparation method thereof include an elastic lead wire 1, a first insulating layer 2 is arranged around the outer surface of the elastic lead wire 1, a shielding layer 3 is arranged around the outer surface of the first insulating layer 2, and a second insulating layer 4 is arranged around the outer surface of the shielding layer 3. Among them, the raw materials of the elastic lead core wire 1 include: 100 parts of thermoplastic polyurethane (TPU), 15 parts of multi-walled carbon nanotubes (MWNT), 40 parts of 3000 mesh conductive graphite, 20 parts of nano conductive carbon black, 2 parts of coupling agent, and 1 part of plasticizer; the melting point of the thermoplastic polyurethane of the elastic lead core wire 1 is 180°C, and the elastic modulus is 6MPa. The first insulating layer 2 is a thermoplastic polyurethane material with a melting point of 140°C and an elastic modulus of 4MPa; the second insulating layer 4 is a polyurethane resin solution, and the relevant elastic modulus after curing is 2.5MPa; the shielding layer 3 is a conductive carbon paste, which is a polyurethane resin base mixed with a conductive substance. It is liquid at room temperature and can be cured under a curing condition of 120°C.

[0147] The preparation method comprises: blending the raw materials of the elastic lead core wire 1 by using an internal mixer at a maximum temperature of 220°C, then cooling and crushing them into particles, and obtaining conductive masterbatch by a twin-screw extrusion granulation mechanism at a processing temperature range of 180°C-230°C, and then obtaining an elastic lead core wire 1 with a diameter of 1.2 mm by using a horizontal extrusion process at a temperature of 180°C-220°C, cutting off 0.5 m of the elastic lead core wire, and reserving 2 cm at both ends for subsequent processing;

[0148] By using the injection molding process, a TPU resin with a melting point of 120°C is selected to perform a coating treatment on the middle area of ​​the elastic lead wire 1 to prepare a first insulating layer 2. After the injection molding process, the lead wire has a diameter of 1.2 mm.

[0149] Provide conductive carbon paste, and form a shielding layer 3 on the outer surface of the first insulating layer 2 by a dip coating process, with a thickness of about 50 μm;

[0150] A cyclic impregnation-curing temperature process is adopted, and a resin is selected to perform encapsulation treatment on the middle area of ​​the outer surface of the shielding layer 3 to prepare the second insulating layer 4. After the injection molding, the lead wire diameter is 2 mm.

[0151] In the obtained stretchable lead wire, the overall elastic modulus size distribution is elastic lead core wire 1>shielding layer 3>first insulating layer 2>second insulating layer 4, and the thickness size is elastic lead core wire 1>second insulating layer 4>first insulating layer 2>shielding layer 3.

[0152] Property test and result analysis

[0153] (I) The lead wires obtained in Examples 1 to 5 and Comparative Examples 1 to 4 were subjected to resistance tests and tensile performance tests, and the results are shown in Table 1 below. It can be seen that the initial resistance of the elastic lead wires obtained in Example 1 and Example 2 is consistent, both of which are 58Ω; in the 10% stretched state, the resistance is 68Ω, in the 30% stretched state, the resistance is 90Ω; in the 50% stretched state, the resistance is 120Ω; the elastic lead wires obtained in Example 3 and Example 4 include a shielding layer and a second insulating layer 4, so the resistance of the obtained material is higher than that of the material in Example 1 and Example 2, with an initial resistance of 66Ω, in the 10% stretched state, the resistance is 78Ω, in the 30% stretched state, the resistance is 105Ω; in the 50% stretched state, the resistance is 132Ω; the difference between Example 5 and Example 2 is that a sheet electrode site is provided, so the resistance values ​​obtained are higher than the resistance values ​​of Example 2.

[0154] The lead wire provided in Comparative Example 1 may break after being stretched.

[0155] The difference between Comparative Example 2 and Example 1 is that the ratio of the conductive particles is different so as to adjust its conductive properties. As the content of the conductive particles decreases, its resistance value will decrease, and the stretchability will be further improved.

[0156] The difference between Comparative Example 3 and Example 2 is that the diameter of the conductive core wire is different, and the conductive performance is further improved.

[0157] In Comparative Example 4, the conductivity is improved by increasing the content of conductive particles, but the final elastic modulus increases and the stretchability is reduced to a certain extent.

[0158] It can be seen that the lead wires provided in Examples 1 to 5 have good stretchability and resistance stability, and the relevant resistance value meets the requirement that the relevant ECG signal resistance value is less than 350Ω (lead wire 32-62cm, organic material classification), and there is no delamination between the elastic lead core wire 1 and the insulation layer 2 after stretching.

[0159] Table 1

[0160]

[0161] (II) The lead wires obtained in Examples 1 to 5 and Comparative Examples 1 to 4 were subjected to resistance tests and tensile fatigue performance tests. The results are shown in Table 2 below. It can be seen that the lead wires obtained in Examples 1 to 5 and Comparative Examples 2 to 3 have good stretchability and resistance stability, and the relevant resistance values ​​meet the requirement that the resistance value of the relevant ECG signal is less than 350Ω (lead wire 32-62cm, organic material). After three sets of fatigue stretching, the resistance between the shielding layer 3 and the elastic lead core wire 1 was tested for continuity, and the results showed that there was no continuity, which met the relevant use requirements. The material in Comparative Example 1 broke; the material in Comparative Example 4 had improved conductivity as the amount of conductive particles increased, but its stretchability decreased. It cracked during the actual tensile fatigue test, thereby affecting its conductivity.

[0162] Table 2

[0163]

[0164] In summary, the stretchable lead wire provided by the present application, the elastic lead core wire 1 provided by the stretchable lead wire includes a first resin and a conductive additive dispersed in the first resin, which ensures that the elastic lead core wire 1 has good conductivity and elasticity, so that it can still maintain good conductivity when it is deformed by external force; further, the first insulating layer 2 provided adopts the second resin, so that the first insulating layer 2 has a certain stretchability; and the elastic modulus of the first insulating layer 2 arranged on the outer surface of the elastic lead core wire 1 is limited to be lower, ensuring that the formed first insulating layer 2 has better elasticity and can play a certain protective role on the elastic lead core wire 1 during the stretching process; therefore, the prepared lead wire has a good stretchable effect, excellent plasticity and conductivity, and is conducive to wide application.

[0165] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A stretchable lead wire, characterized in that: The stretchable lead wire includes an elastic lead core wire and a first insulating layer arranged around the outer surface of the elastic lead core wire, the elastic lead core wire includes a first resin and a conductive additive dispersed in the first resin, the first insulating layer includes a second resin, and the elastic modulus of the first insulating layer is lower than the elastic modulus of the elastic lead core wire.

2. The stretchable lead wire according to claim 1, characterized in that: The elastic modulus of the first insulating layer differs from the elastic modulus of the elastic lead core wire by 30% to 300%.

3. The stretchable lead wire according to claim 1, characterized in that: The compatibility degree deviation between the first insulating layer and the elastic lead core wire is 0% to 50%.

4. The stretchable lead wire according to claim 1, characterized in that: The melting point temperature of the second resin is lower than the melting point temperature of the first resin; and the melting point temperature of the second resin differs from the melting point temperature of the first resin by 10° C. to 100° C.

5. The stretchable lead wire according to any one of claims 1 to 4, characterized in that: The raw materials of the elastic lead core wire include the following components in parts by weight:

6. The stretchable lead wire according to claim 5, characterized in that: The first resin includes at least one of polyurethane, silicone rubber, silicone rubber polyester, polyolefin elastomer, and rubber elastomer; and / or, The conductive additive comprises at least one of carbon nanotubes, nanoscale carbon black, graphene, short carbon fibers, graphite, MXene, metal nanowires and alloy particles; and / or, The coupling agent includes at least one of a silane coupling agent and a phthalate coupling agent; and / or, The other auxiliary agents include at least one of an antioxidant, a light stabilizer, and a plasticizer.

7. The stretchable lead wire according to any one of claims 1 to 4, characterized in that: The stretchable lead wire further includes a shielding layer, which is disposed around an outer surface of the first insulating layer.

8. The stretchable lead wire according to claim 7, characterized in that: The elastic modulus of the shielding layer is smaller than the elastic modulus of the elastic lead core wire; and / or, The thickness of the shielding layer is 20-100 μm.

9. The stretchable lead wire according to claim 7, characterized in that: A second insulating layer is also disposed on the outer surface of the shielding layer, wherein the elastic modulus of the second insulating layer is lower than the elastic modulus of the first insulating layer.

10. The stretchable lead wire according to any one of claims 1 to 4, characterized in that: The diameter of the elastic lead core wire is 1 to 2 mm; and / or, The total thickness of all insulating layers is 0.2 to 1 mm.

11. The stretchable lead wire according to any one of claims 1-4, 6, 8-9, characterized in that: The overall elastic modulus of the stretchable lead wire is 0.1-10 MPa.

12. A method for preparing a stretchable lead wire as claimed in any one of claims 1 to 11, characterized in that: The steps include: The raw material of the elastic lead core wire is melted and extruded to obtain the elastic lead core wire; A raw material for a first insulating layer containing the second resin is provided, and a coating process or a melt encapsulation process is used to form a first insulating layer covering the elastic lead core wire on the outer surface of the elastic lead core wire.

13. An electrocardiogram signal detection device, characterized in that: It comprises a lead wire and an ECG signal detection module, wherein the ECG signal detection module is connected to the lead wire for ECG signal detection, wherein the lead wire is the stretchable lead wire described in any one of claims 1 to 11 or the stretchable lead wire prepared by the method for preparing the stretchable lead wire described in claim 12.

Images