Half-dry electrode, system and method for bioelectrical signal sensing

Abstract

The invention discloses a half-dry electrode for bioelectrical signal sensing. The half-dry electrode comprises a supporting base, at least one supporting leg attached to the supporting base and extending from the supporting base, an ion slow release body and sensing elements arranged at the tail end of the supporting leg. The ion slow release body contains conductive liquid and slowly releases the conductive liquid to present the half-dry surface to a subject; at least part of the ion slow release body or the conductive liquid released by the ion slow release body is in contact with the sensing elements, and thus bioelectrical signals are transmitted to the sensing elements from the subject through the ion slow release body. The half-dry electrode is reasonable in structure, convenient and comfortable to use and good in contact with the skin, electrode-skin impedance is relatively low and stable, and signal quality is good.

Description

Technical field [0001] The invention belongs to the field of bioelectric technology, and specifically relates to a semi-dry electrode for bioelectric signal sensing, as well as its system and method. It is widely used in bioelectric recording, measurement, and stimulation, including medical equipment, mobile equipment, and home Health care, psychological cognition, games, brain-computer interface, rehabilitation training, etc. are especially suitable for EEG measurement. Background technique [0002] Currently, recording bioelectric signals such as electrocardiogram (EGG), brain electricity (EEG) or electromyography (EMG) routinely requires wet electrodes. Wet electrode refers to the electrode technology that needs to use more electrolyte to reduce the electrode skin impedance. Electrolytes used in wet electrodes can be divided into two categories: conductive fluid (such as conductive glue, conductive salt water) and conductive paste or viscous gel. Conductive fluid does not ha...

AI Technical Summary

Problems solved by technology

[0003] Wet electrodes are currently the "gold standard" for clinical and scientific research applications. Due to their low and stable impedance, generally within 5 kΩ, the signal quality is high, but there are still the following disadvantages: (1) Wet electrodes need to be coated with conductive glue (paste) And skin pretreatment, preparation is troublesome and time-consuming, especially for high-density electrode measurement; (2) Electrolyte such as conductive gel is easy to dry out, and conductive gel needs to be replenished regularly; (3) Conductive paste or viscous gel may fall off, causing measurement Interruption; (4) The amount of electrolyte used is large, the hair of the subject is dirty, and it is uncomfortable to use. After the measurement, the hair needs to be washed to remove the electrolyte; therefore, the above-mentioned inconvenience of the wet electrode severely limits the brain of the outdoor and individualized environment. Electrical application

While finger electrodes are effective in reaching the scalp through many different hair styles, they still have the disadvantage that if the diameter of the fingers is small enough to easily penetrate between the hairs, due to the high Stress concentration may be painful; larger diameter fingers, while not painful, generally cannot penetrate between hairs without manual adjustment

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