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Liquid metal EEG electrode

A liquid metal, EEG technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as long preparation time, inconvenience for subjects, and easy adhesion to hair, etc., to achieve simple use, small overall structure, low cost The effect of contact resistance

Pending Publication Date: 2020-07-24
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, wet electrodes often take a long time to prepare in the early stage during use, and the cost is relatively high
The pasty gel used is very easy to adhere to the hair, not only the material loss is large, but also the test subject is inconvenient

Method used

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  • Liquid metal EEG electrode
  • Liquid metal EEG electrode
  • Liquid metal EEG electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: see Figure 1-3 .

[0028] A liquid metal EEG electrode, comprising a conductive gel layer 1, a contact point 11, a conductive shielding layer 2, a fixed point 3 and a shielding wire 4; the back side of the conductive gel layer 1 is adhered to the conductive shielding layer 2, and There is a contact point 11, and a fixed point 3 is welded on the conductive shielding layer 2, and the shielded wire 4 is connected to the conductive shielding layer 2 through the fixed point 3.

[0029] The conductive gel layer 1 is a circular polymer gel sheet with a network formed by a conductive polymer structure inside, and a saline solution is adsorbed inside the polymer network; one side of the conductive gel layer 1 is equipped with a contact point 11, and the contact point 11 is arranged on one side of the conductive gel layer. Point 11 is filled with liquid metal, and the liquid metal is GaIn alloy.

[0030] The conductive shielding layer 2 is a metal disc, the surfa...

Embodiment 2

[0041] Example 2: see Figure 4-6 .

[0042] A liquid metal EEG electrode, comprising a conductive gel layer 1, a contact point 11, a conductive shielding layer 2, a fixed point 3 and a shielding wire 4; the back side of the conductive gel layer 1 is adhered to the conductive shielding layer 2, and There is a contact point 11, and a fixed point 3 is welded on the conductive shielding layer 2, and the shielded wire 4 is connected to the conductive shielding layer 2 through the fixed point 3.

[0043] The outside of the conductive shielding layer 2 is equipped with a shielding case 5, a sealing sleeve 6, a connecting column 7, a sealing valve 8 and a plug 9; The layer 1 and the conductive shielding layer 2 are hermetically connected, the lower end of the connecting column 7 is connected to the fixed point 3, and further extends to the opening at the bottom of the shielding shell 5, and the connecting column 7 is fixed with a sealing valve 8 at a position 2 / 3 from the lower end;...

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PUM

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Abstract

The invention discloses a liquid metal EEG electrode. After the EEG electrode makes contact with scalp of a subject, liquid metal with a low melting point is molten by body heat of the subject, the molten metal droplets are transferred to the surface of gel under the effects of capillaries among gel networks and gravity, the liquid metal droplets transferred to the surface of the gel make direct contact with the scalp at a contact point under the effect of surface tension of the liquid metal droplets so as to lead an EEG signal below the cuticle of the scalp, the EEG signal is introduced intoa salt solution of a conductive gel layer, ions in the salt solution participates in conduction, and finally, the EEG signal is sent out. The liquid metal is used as a contact medium to replace conductive adhesive, the effects of hair on electrode fixation and EEG measurement can be avoided, and purer EEG data can be acquired; and the overall structure is simple, general and easy to manufacture and use.

Description

technical field [0001] The invention relates to the technical field of EEG signal acquisition, in particular to a liquid metal EEG electrode. Background technique [0002] Liquid metal refers to a type of alloy with a low melting point, such as GaIn alloy, which can maintain a liquid state at room temperature. Due to its good biocompatibility, stable chemical properties, and wide controllable melting point range, GaIn alloys have been widely used in the fields of flexible conductive materials and heat transfer materials. [0003] EEG is an electrophysiological monitoring method to record the electrical activity of the brain. It is widely used in cognitive science, psychology and neuroelectrophysiological research, and provides an effective clinical application for sleep monitoring, anesthesia or coma depth assessment, and epilepsy diagnosis. reference basis. However, the discharge amplitude of brain nerve cells is weak, and the collected EEG signals are often unstable and ...

Claims

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Application Information

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IPC IPC(8): A61B5/0478A61B5/0476
CPCA61B2562/14A61B2562/16A61B5/291A61B5/369
Inventor 谢维昌
Owner NANCHANG UNIV
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