Contact impedance small flexible dry electrode and preparation method thereof

Abstract

The invention discloses a contact impedance small flexible dry electrode and a preparation method thereof, which relates to the technical field of medical instruments. The contact impedance small flexible dry electrode is composed of a flexible electrode body and an electrical connector, wherein the flexible electrode body is prepared by a mixture of a silicone rubber and a conductive nano material of a flexible material, and the flexible conductive material is used as a substrate, the conductive nano material is added and dispersed uniformly, pressurized heating and solidification molding arecarried out, further crosslinking is carried out by two-stage vulcanization, so that the prepared dry electrode has excellent conductivity and flexibility, and has good geometric adaptability. The contact impedance small flexible dry electrode can be applied to the irregular skin surface for close fitting, which increases a contact area between the dry electrode and the skin, reduces the contactresistance between the skin and the electrode, and can effectively realize the daily activity monitoring of an EEG signal, and has a wide application scenarios for mental health consultations and brain-computer interfaces such as military, schools and hospitals.

Description

【Technical field】 [0001] The application belongs to the technical field of medical devices, and in particular relates to a flexible dry electrode with small contact resistance and a preparation method thereof. 【Background technique】 [0002] Bioelectrical signals contain a large amount of life activity information, which can indirectly reflect the internal physiological conditions of organisms. The detection and utilization of human bioelectrical signals are widely used in clinical diagnosis, such as electrocardiogram ECG, electromyography EMG, electroencephalogram EEG and bioelectrical impedance EIT. [0003] Currently on the market, the electrodes used to collect bioelectrical signals are divided into two categories: wet electrodes and dry electrodes. When wet electrodes are used to collect bioelectrical signals, users need to apply conductive gel on the signal collection position, which has the problem of cumbersome operation. At the same time, the conductive gel is easy...

AI Technical Summary

Problems solved by technology

When wet electrodes are used to collect bioelectrical signals, the user needs to apply conductive gel on the electrical signal collection position, which has the problem of cumbersome operation. At the same time, the conductive gel is easy to dry after a short time of use, resulting in poor signal stability.

Dry electrodes do not require conductive glue when used. Due to their convenience, quickness and long-term stability, they have become an ideal substitute for traditional wet electrodes. However, the existing methods for preparing dry electrodes are too complex and expensive to manufacture, which is not conducive to industrialization. , and most of these dry electrodes are rigid materials, and there are gaps when they are in contact with the skin, resulting in a large contact impedance during use. Contact impedance is an important parameter when collecting electrophysiological signals. The lower the contact impedance, the better the signal quality. Rigid dry electrode structure is too rigid, resulting in poor wearing comfort

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