JPH0310963Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a biological stimulation electrode that is attached to a living body, especially the face, in order to apply a pulse voltage to the living body and measure its evoked response. .

[Problems that conventional technology and ideas try to solve]

2. Description of the Related Art A method of diagnosing a patient based on the evoked response of the living body by applying a stimulating voltage to the living body is well known. Attempts have also been made to attach stimulating electrodes to the face and measure the evoked responses of the trigeminal nerve using an electroencephalograph. However, in this case, since the stimulation point is naturally close to the head where the measurement electrode is attached, the stimulation voltage is induced directly to the measurement electrode, and a pulse oscillatory artifact occurs at the beginning of the detected waveform by the electroencephalogram, causing the measurement It makes it difficult. For this reason, methods such as reducing the stimulation voltage level as low as possible or interposing a shield between the stimulation electrode and the head electrode have been taken, but these methods cannot be used as a decisive solution. Measuring the trifurcated diameter of a species was thought to be difficult.

Furthermore, in conventional biological stimulation electrodes, the positive and negative electrode conductors are arranged side by side on a common substrate, and the electrodes are attached to the living body using tape or the like, which poses problems in terms of the ease of attachment.

In view of this point, it is an object of the present invention to provide a biological stimulation electrode that can suppress the level of artifacts and is easy to wear.

[Means and actions for solving problems]

In order to achieve this objective, the present invention provides a pair of electrode bodies each having an electrode conductor and a ground conductor surrounding the electrode conductor through a recess, which are insulated from each other.
A clip was attached that could be opened and closed for clamping with the surfaces facing each other. Further, a positive voltage lead wire was led out from one of the electrode conductors, a negative voltage lead wire was led out from the other, and grounding lead wires were led out from both ground conductors.

The electrode body can be easily attached to the lips, cheeks, earlobes, fingers and toes, etc. by the clamping force of the clip. During measurement, a leakage electric field from the electrode conductors that is generated by applying a pulsed stimulation voltage between the electrode conductors is directed toward a grounded earth conductor, and leakage to the outside is contained.

[Embodiment of the invention] Fig. 1 shows a trigeminal nerve stimulation electrode 1 according to the invention, which includes a pair of disc-shaped electrode bodies 10 with a diameter of, for example, about 20 mm, and a pair of disc-shaped electrode bodies 10, which are arranged so that the stimulation site is sandwiched between their surfaces. It consists of clips 20 attached to each side facing each other and spaced apart from each other by several millimeters. The electrode body 10 has a disc-shaped insulating synthetic resin base, and has a ring-shaped groove, or recess 12, formed concentrically with the disc on its flat surface, thereby forming a cylindrical part 13 in the center and an annular part around the periphery. A protruding portion 14 is formed. A foil-shaped electrode conductor 17, for example a foil of Ag.AgCl, is adhered to the surface of the cylindrical portion 13, and a foil of Ag.Ag.Cl is adhered to the surface of the annular projection portion 14.
A ground conductor 16, which is a ring-shaped foil of AgCl, is glued. And a lead wire 21 for applying a positive voltage from the back surface of the electrode conductor 17 of one electrode body 10.
is led out, and the electrode conductor 17 of the other electrode body 10
A lead wire 21 for applying a negative voltage is led out,
Further, a grounding lead wire 22 is led out from the back surface of each grounding conductor 16. Opposite ends of these leads can be connected to plugs that are attached to the stimulator.

The clip 20 is formed by crossing a single metal wire having bending elasticity and having a grip portion.

For measurement, as shown in FIG. 2, the maximum diameter portions 20a of the clips 20 of the trigeminal nerve stimulation electrode 1 are pushed inward to mutually spread the electrode bodies 10, and one of them is inserted into the oral cavity. This causes the cheek to be pinched. Then, the + terminal of the stimulator is connected to, for example, the outer lead wire 21, and the - terminal is connected to the inner lead wire 21. Further, both lead wires 22 are respectively grounded. In this state, a pulse voltage is applied between both electrode conductors 17, and the response waveform induced by the electrode attached to the head is measured using an electroencephalograph. Since the recess 12 is interposed between the electrode conductor 17 and the ground electrode 16, the skin will not bypass the two electrodes.

The radiated electric field generated from the electrode conductor 17 is directed toward the ground conductor 16, and is hardly radiated outside the electrode. As a result, artifacts that appear on the electroencephalograph are reduced, and the response waveform of the trigeminal nerve can be measured with high precision. This reduction in artifacts has also been confirmed experimentally.

FIG. 3 shows the main part of another embodiment.
While the base of the figure is made of an insulator,
It is constructed as an electrically conductive cap, with a cylindrical insulator 27 having an electrode conductor 26 formed at its tip attached to the center. The ground conductor 25 not only surrounds the electrode conductor 26 but also surrounds the back thereof. The recess 28 is formed by the insulator 27 and the peripheral wall of the cap-shaped ground conductor 25.

In addition, we may change the shape of the electrode body to something other than circular, use the electrode conductor in a pole shape instead of foil, or change the lead wire lead-out method or clip structure.
Various modifications are possible within the scope of the invention. Furthermore, the present invention can also be applied to biological stimulation electrodes worn on fingers.

[Effect of idea]

As described above, according to the present invention, it is possible to realize a stimulation electrode for a living body that can be attached to a living body simply by a clip operation and can significantly reduce artifacts occurring in a measuring device. This makes it possible to easily measure evoked responses using voltage in the trigeminal nerve, which has been considered difficult in the past, and greatly contributes to more precise diagnosis.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a trigeminal nerve stimulation electrode according to an embodiment of the present invention, Fig. 2 is a perspective view showing the usage state of the same embodiment, and Fig. 3 is a cross-sectional view of a biological stimulation electrode according to another embodiment. be. 1... Trigeminal nerve stimulation electrode, 10... Electrode body,
12, 28... recess, 16, 25... earth conductor, 17, 26... electrode conductor, 20... clip, 21, 22... lead wire.

Claims (1)

[Scope of utility model registration request] A clip is attached to a pair of electrode bodies, the surfaces of which are provided with an electrode conductor and a ground conductor surrounding the electrode conductor through a recess in an insulated state from each other, with the surfaces thereof facing each other, and A stimulating electrode for living body comprising a positive voltage lead wire from one of the conductors and a negative voltage lead wire from the other, and ground lead wires from each of the pair of ground conductors.