Flexible skin surface dry electrode and preparation method thereof

Abstract

The invention provides a flexible skin surface dry electrode and a preparation method thereof. The flexible skin surface dry electrode comprises a flexible conducting substrate and multiple microneedle bodies forming a microneedle array, wherein each microneedle body is of a taper shape and comprises a root part and a front end, the root parts of the multiple microneedle bodies are fixed on one surface of the flexible conducting substrate, and the front ends of the microneedle bodies are higher than the surface of the flexible conducting substrate. According to the invention, the substrate material of an original dry electrode is changed from a rigid material into a flexible material; since the flexible substrate can be tightly attached to the skin, the microneedles on the dry electrode overcome the influence of keratoderma, the electrical contact characteristic of the electrode and the skin is improved and the contact impedance is reduced; when an external force acts on the dry electrode, the flexible substrate can generate elastic deformation, thus the breaking of the microneedles is effectively avoided and the use safety is improved; and the substrate material of the dry electrode with the flexible substrate is elastic, thus the wearing uncomfortableness is alleviated.

Description

technical field [0001] The invention relates to the field of design and micromachining of electrode devices for bioelectrical signal detection, and more particularly relates to a flexible skin surface dry electrode and a preparation method thereof. Background technique [0002] Biopotential is an important physiological index and plays an important role in the fields of clinical medicine and biomedicine. Therefore, it is of great significance to effectively detect and study physiological electrical signals. The bioelectrode can convert the ionic current in the human body into an electronic current that can be recognized by the instrument, so as to achieve the purpose of extracting biopotential. Therefore, the performance of the electrode will directly affect the quality of the collected signal. [0003] The skin is divided into three main layers from the outside to the inside: epidermis, dermis and subcutaneous tissue. The outermost layer of the epidermis is the stratum co...

AI Technical Summary

Problems solved by technology

In the process of use, if there are incorrect operations such as dry electrodes rubbing against the skin, it is easy to break the microneedle array, which will affect the quality of the extracted signal and reduce the service life of the dry electrodes.

The disadvantage of the hard substrate is that it cannot fit the skin closely, which affects the depth of the microneedle penetration into the skin and easily introduces noise interference

Another disadvantage of the dry electrode composed of a hard substrate is that it cannot produce elastic deformation when subjected to external force, acting directly on the skin like a steel plate, which greatly reduces the comfort of the subject.

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