CZ304875B6 - Dry electrode for registering biopotentials of head hairy portion - Google Patents

Abstract

The present invention provides a dry electrode (A) for registering biopotentials of head hairy portion, the electrode (A) having the form of substantially a comb comprising teeth (B) connected with each other in electrically-conducting manner, whereby the length (c) of the teeth (B) is at least 70 percent of the electrode (A) length (b). This form enables an easy application of the electrode to the hairy portion of the head and at the same time allows for a good contact with the skin.

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a new dry surface electrode suitable for the registration of brain bio-potentials (EEG, EP, ERP, hereinafter EEG).

Background Art

Traditionally, electrodes are used to register the EEG, which use electrolyte to contact the scalp. Nowadays, so-called dry electrodes can be used with low-noise EEG amplifiers. The dry electrode system is an advantage in their application - it does not require degreasing of the skin and application of the gel, which saves time during assembly up to tens of minutes (depending on the number of electrodes) and improves the patient's comfort. Existing EEG dry electrodes in the hairy head utilize several discrete points to contact the electrode with the skin. At present, all of these systems are implemented by a plurality of spikes located on a carrier, e.g., a system of skin-resilient flexible spikes (U.S. Pat. No. 4,967,038), rigid spikes in a resilient mat (WO 2012/150528), or a plurality of spike-regulated spikes. thread system (US 2011/0237 923). All of these systems require special holders that fix the electrodes to a given point on the head while providing a suitable downforce that, due to the relatively small area of the spikes, can be annoying (even painful) during long-term application.

SUMMARY OF THE INVENTION

The object of the present invention, obviating the drawbacks of the prior art, is a substantially dry comb-shaped electrode comprising interconnecting teeth having a length of at least 70% of the length of the entire electrode. This shape allows easy application of the electrode to the hairy head while allowing good skin contact. The electrode according to the invention is hereinafter referred to as the "comb electrode".

The comb electrode is made of a conductive material (eg sheet, wire). It is preferred that the material be resilient to conform to the shape of the head.

Preferably, the teeth of the comb electrode are shaped to form at least one arc, thereby providing pressure to the scalp. In a more preferred embodiment, at least one comb electrode tooth may be diverted to increase the pressure of other teeth to the skin.

The electrode according to the invention does not require a special holder, but preferably it can be held in place by a flexible band or cap at a specified point on the head.

The edges of the comb electrode are preferably adapted to prevent skin injury, i.e., are rounded.

The individual teeth of the comb electrode preferably have a width in the range of 0.5 to 3 mm and their spacing is in the range of 0.5 to 3 mm to ensure easy penetration between the hair with respect to their quality and density and at the same time to ensure contact. the area of skin that the teeth of the comb electrode produces was maximum.

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BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows one embodiment of a sheet metal electrode.

FIG. 2 shows another embodiment of a wire-like electrode.

FIG. 3 examples of shaping a comb electrode for good skin contact-side view.

FIG. 4 illustrates the location of the comb electrodes, for example, under a flexible band.

EXAMPLES OF THE INVENTION

FIG. 1 shows the electrode A in the form of a substantially ridge with teeth B, wherein the length c of the teeth B represents at least 70% of the length b of the electrode A. This electrode is made of a conductive sheet.

FIG. 2 shows another embodiment of the comb electrode A, made of a wire having a diameter of 0.5 mm.

FIG. 3 shows examples of suitable shaping of the comb electrode teeth into one or more arcs. The middle embodiment shows the case where one to two teeth are diverted to increase the pressure of other teeth to the skin.

FIG. 4 shows the location of the head electrodes D on the head, the electrodes D being held by the elastic band C.

The individual teeth B of the comb electrode preferably have a width of two ranges from 0.5 to 3 mm and their mutual spacing e ranges from 0.5 to 3 mm to ensure easy penetration between the hair with respect to their quality and density and at the same time that the contact surface with the skin produced by the comb electrode teeth is maximum.

A particularly preferred size of the electrode (a x b) is 20 x 23 mm with a tooth width d of mm 1 mm, tooth length c of 18 mm and spacing of e 1 mm.

Claims (5)

PATENT CLAIMS A dry electrode (A) for registering biopotentials from the hairy part of the head, characterized in that it has the shape of a substantially comb containing interconnecting teeth (B), wherein the length (c) of the teeth (B) is at least 70% of length (b) electrodes (A). Electrode according to claim 1, characterized in that the teeth (B) of the comb electrode (A) are shaped to form at least one arc on each tooth (B). Electrode according to claim 1, characterized in that the at least one tooth (B) of the comb electrode (A) is deflected to increase the pressure of the other teeth (B) against the skin. 4. The electrode of claim 1 wherein the edges are rounded. Electrode according to claim 1, characterized in that the individual teeth (B) of the comb electrode (A) have a width (d) in the range of 0.5 to 3 mm and their spacing (e) is in the range of 0.5 to 3 mm. 3 mm.