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A kind of flexible electrode, its preparation method and a kind of myoelectric sensor

An electrode and conductive connector technology, applied in the field of flexible electronic technology and information control, can solve the problems of liquid metal droplet overflow at the bottom of the electrode, uneven distribution of liquid metal, etc., to prevent liquid metal overflow, high flexibility, and stable performance. Effect

Active Publication Date: 2021-03-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific gravity of the liquid metal, the liquid metal tends to sink to the bottom during the actual static solidification process, which causes the problem of uneven distribution of the liquid metal in the flexible electrode, and even a liquid state at the bottom of the electrode when the sinking is serious The phenomenon of metal droplet overflow

Method used

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  • A kind of flexible electrode, its preparation method and a kind of myoelectric sensor
  • A kind of flexible electrode, its preparation method and a kind of myoelectric sensor
  • A kind of flexible electrode, its preparation method and a kind of myoelectric sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0054] In this embodiment, the schematic diagram of the structure of the flexible electrode is as follows figure 1 , 2 As shown, it includes an electrode inner layer 1-1, a protective layer 1-2 and a conductive connector 1-3.

[0055] The outer layer of the electrode is conductive and thinly covers the bottom and sides of the inner layer of the electrode.

[0056] The conductive connector 1-3 is an electrode female button of a conductive interface, one end of which extends into the bottom of the inner layer of the electrode and is connected with the outer layer of the electrode, and the other end is connected to an external component to form an electrical connection.

[0057] In this example, the liquid metal is GaInSn, which is an alloy with a mass ratio of Ga:In:Sn=62.5:21.5:16, which is liquid at room temperature and has conductivity. The solid conductive material is carbon nanotubes, preferably nanowires, graphene and the like. The elastomer is PDMS, which is a thermopl...

Embodiment 2

[0065] In this embodiment, the structure of the flexible electrode is the same as that in Embodiment 1.

[0066] In this example, the liquid metal is GaInSn, which is an alloy with a mass ratio of Ga:In:Sn=62.5:21.5:16, which is liquid at room temperature and has conductivity. The solid conductive material is carbon nanotubes, preferably nanowires, graphene and the like. The elastomer is PDMS, which is a thermoplastic elastomer that can stretch under certain stress.

[0067] In this example, the flexible electrode is made by the overall mold method, as follows:

[0068] (1) Prepare the overall mold for the outer layer of the electrode, and its structure is as follows Image 6 As shown; mechanically stir PDMS and curing agent in proportion, then add a certain proportion of carbon nanotubes into an ultrasonic stirring device, and stir in a high-speed shear flow, so that carbon nanotubes are evenly dispersed in PDMS, and the package is prepared. Cover the electrode outer layer...

Embodiment 3

[0071] In this embodiment, the structure of the flexible electrode is the same as that in Embodiment 1.

[0072] In this example, the liquid metal is GaInSn, which is an alloy with a mass ratio of Ga:In:Sn=62.5:21.5:16, which is liquid at room temperature and has conductivity. The solid conductive material is carbon nanotubes, preferably nanowires, graphene and the like. The elastomer is PDMS, which is a thermoplastic elastomer that can stretch under certain stress.

[0073] In this example, the flexible electrode is made by mold method, as follows:

[0074] (1) Prepare the mold at the bottom of the electrode inner layer and the electrode outer layer, which is called the first mold, and its structure is as follows Figure 7 As shown, the bottom has a stepped structure;

[0075] Mechanically stir the PDMS and curing agent in proportion, then add a certain proportion of carbon nanotubes into the ultrasonic stirring device, and stir in the high-speed shear flow, so that the ca...

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Abstract

The invention discloses a flexible electrode, which comprises an inner layer of an electrode, an outer layer of an electrode and a conductive joint; the inner layer of an electrode is formed by mixing liquid metal with a molten elastomer; The bottom is composed of solid conductive material and elastic body, and the solid conductive material is evenly distributed in the elastic body; one end of the conductive connector extends into the bottom of the inner layer of the electrode, and the other end connects to external components to form an electrical connection. The flexible electrode has both high conductivity and high flexibility, and is safe, reliable, and stable in performance. The EMG signal with signal-to-noise ratio has great potential application value in rehabilitation medical engineering and sports monitoring.

Description

technical field [0001] The invention relates to the fields of flexible electronic technology and information control technology, in particular to a flexible electrode, its preparation method and an electromyographic sensor. Background technique [0002] With the development of flexible electronic technology and people's attention to smart medical care, myoelectric sensors that can be used continuously for a long time and can collect signals with high signal-to-noise ratio have attracted more and more attention. [0003] The electrode is the core of the sensor signal acquisition module, and its performance determines the performance of the sensor to a large extent. Electrodes are mainly divided into two categories: wet electrodes and dry electrodes. The wet electrode has good conductivity and mature technology, but the conductive glue used is easy to dry and is not suitable for long-term continuous use. Dry electrodes are mainly divided into three types: immersion microneed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/296
CPCA61B5/296
Inventor 尚杰唐大秀李润伟刘宜伟胡超
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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