CN201135436Y - Needle-like neural microelectrodes with position-stabilizing structures - Google Patents

Abstract

A needle-shaped nerve microelectrode with a position-stabilizing structure is characterized in that it includes: an electrode body, which is needle-shaped, has a front end and a tail end, and is edged on the outer wall of the side of the electrode body near the tail end. Multiple protrusions are fixed at the same section; multiple electrode points are coated on the surface of the electrode body, and each electrode body is connected to the tail end of the electrode body with a conductive wire coated on the surface of the electrode body ; an insulating layer, which is coated on the surface of the electrode body and covers the conductive wire; the plurality of electrode points are exposed on the insulating layer. In the needle-shaped nerve microelectrode with a position-stabilizing structure of the utility model, a structure capable of positioning the electrode is added to the side of the needle-shaped nerve micro-electrode body. The structure does not increase the difficulty of the manufacturing process and does not affect the implantation, but can reduce the relative displacement between the implanted needle-shaped electrode and the implanted tissue, and in particular can prevent the electrode from falling out.

Description

Needle-like neural microelectrodes with position-stabilizing structures

technical field

The utility model belongs to the technical field of electrode sensors and processing for physiological signal detection, and more specifically refers to a needle-shaped nerve microelectrode with a position-stabilizing structure.

Background technique

The acquisition of EEG or neural electrical signals is one of the main methods to understand the electrical activity of nerves, and is an important research method for neuroelectrophysiology, medical diagnosis or brain science. An extracellular electrode is a device that records changes in the potential of neurons near the outside of the cell or uses a stimulating current to affect the electrical activity of the cell; the one used for recording is called a recording electrode, and the one used for stimulation is called a stimulating electrode.

There are generally two types of such electrodes, one is non-invasive, and the electrodes are mostly flat, and the other is invasive, needle-shaped, and the recording or stimulation point is located near the needle tip, which can record the electrical activity signal of a single neuron Or stimulate a limited range of neurons. In animal experiments, when the needle-shaped electrode is inserted into the nerve tissue, if there is no auxiliary positioning or fixation device, the position of the electrode in the nerve tissue will change with the movement of the implant. The displacement of the input electrode along the direction opposite to the insertion direction leads to uncertainty in the position between the recording/stimulation site on the electrode and the recorded/stimulated neural unit, which makes it difficult to maintain stable recording and stimulation effects and affects the quality of the recorded signal or consistency. In severe cases, the implanted electrodes will come out.

Utility model content

The purpose of the utility model is to provide a needle-shaped nerve microelectrode with a position-stabilizing structure, and a structure for positioning the electrode is added to the side of the needle-shaped nerve microelectrode body. This structure changes the side structure of the originally straight needle-shaped electrode body, so that the cross section of the electrode body has one or more protrusions in the electrode axis. This structure does not increase the difficulty of the manufacturing process and does not affect the implantation, but it can Reduce the relative displacement between the implanted needle electrode and the implanted tissue, especially to prevent the electrode from coming out.

The utility model provides a needle-shaped nerve microelectrode with a position-stabilizing structure, which is characterized in that it comprises:

An electrode body, the electrode body is needle-shaped, has a front end and a tail end, and a plurality of protrusions are fixed along the same section on the outer wall of the electrode body near the tail end;

A plurality of electrode points, the plurality of electrode points are coated on the surface of the electrode body, and each electrode body is connected to the tail end of the electrode body with a conductive wire coated on the surface of the electrode body;

an insulating layer, which is coated on the surface of the electrode body and covers the conductive wire;

The plurality of electrode points are exposed on the insulating layer.

Wherein the electrode body is silicon or metal or glass material.

Wherein the cross-sectional shape of the electrode body is circular, elliptical or polygonal.

Wherein the number of protrusions on the electrode body is 1-4.

Wherein the electrode body and the protrusions are integrally formed.

Wherein the electrode body and the protrusions are welded or bonded.

Wherein the plurality of protrusions are wing-shaped triangles, and the included angle of the triangles pointing to the front end is an acute angle.

Wherein the plurality of protrusions are in the shape of airfoils, and the included angle of the airfoils pointing to the front end is an acute angle.

The number of multiple electrode points is 1-50.

The beneficial effects of the utility model are:

In the needle-shaped nerve microelectrode with a position-stabilizing structure of the utility model, a structure capable of positioning the electrode is added to the side of the needle-shaped nerve microelectrode body. This structure changes the side structure of the originally straight needle-shaped electrode body, so that the cross section of the electrode body has one or more protrusions in the electrode axis. This structure does not increase the difficulty of the manufacturing process and does not affect the implantation, but it can Reduce the relative displacement between the implanted needle electrode and the implanted tissue, especially to prevent the electrode from coming out.

Description of drawings

In order to further illustrate the technical content of the present utility model, below in conjunction with embodiment and accompanying drawing, describe in detail as follows, wherein:

Fig. 1 is the structural representation of the first embodiment of the utility model;

Fig. 2 is a schematic structural view of the second embodiment of the present invention.

Detailed ways

See also shown in Fig. 1, Fig. 1 is the structural representation of the first embodiment of the present utility model, the utility model provides a kind of needle-shaped nerve microelectrode with position stable structure, it is characterized in that, comprises:

An electrode body 1, the electrode body 1 is needle-shaped, and the length is between 0.5 mm and 15 mm. There is a front end 2 and a tail end 3. The front end 2 of the electrode body 1 is conical or chisel-shaped or blade-shaped, which can be inserted into biological tissue with less resistance and minimize the damage to the insertion site. The electrode body 1 is made of silicon or metal or glass material. The cross-sectional shape of the electrode body 1 is circular, elliptical or polygonal, and the cross-sectional area is generally 20 square micrometers to 3 square millimeters. A plurality of electrode points 4, the plurality of electrode points 4 are coated on the surface of the electrode body 1, and each electrode body 1 is connected to the tail end 3 of the electrode body 1 with a conductive wire 5 coated on the surface of the electrode body 1, The number of electrode points 4 used for extracellular recording or stimulation is 1-50 (one in the figure), distributed on the front end of the electrode body 1 or the entire electrode body 1, and the surface area of the electrode points 4 ranges from 10 square microns to 5 Each electrode point 4 is connected to the tail end 3 of the electrode body 1 through a conductive wire 5, and these conductive wires 5 are insulated from each other. Except for the electrode point 4 , the rest of the electrode body 1 , including the conductive wire 5 , is sealed and covered by the insulating layer 7 . When the electrode body 1 is implanted in the animal nerve tissue, the potential of the electrode point 4 will change with the potential change of the electrical activity of the nearby nerve cells, and this potential change will be conducted to the outside of the body through the conductive wire 5; The signal is transmitted to the electrode point 4 through the conductive wire 5, thereby stimulating or affecting the electrical activity of the nerve near the electrode point 4. On the outer wall of the electrode body 1 close to the tail end 3, a plurality of protrusions 6 are fixed along the same section, the number of the plurality of protrusions 4 on the electrode body 1 is 1-4, and the electrode body 1 and the plurality of The protrusions 6 are integrally formed, or the electrode body 1 and the plurality of protrusions 6 are welded or bonded, the plurality of protrusions 6 are wing-shaped triangles, and the included angle of the triangles pointing to the front end 2 of the electrode body 1 is an acute angle.

See also shown in Fig. 2, Fig. 2 is the structural representation of the second embodiment of the present utility model, and the structure of this second embodiment is basically the same as that of the first embodiment, and the same position adopts the same label, and the difference is that A plurality of protrusions 6' are fixed along the same section on the outer wall of the electrode body 1 near the tail end, and the plurality of protrusions 6' are in the shape of wing-shaped pieces, which point to the front end 2 of the electrode body 1 The included angle is an acute angle.

Referring to Fig. 1 and Fig. 2, when the electrode body 1 is inserted into the biological tissue, especially when the tail end 3 of the electrode body 1 with protrusions 6, 6' enters the tissue, the protrusion of the tail end 3 of the electrode body 1 6. The front end of 6, 6' has a sharper angle, which forms less resistance and can be easily entered; the tail end 3 of the electrode body 1 protrudes 6, 6', and the rear end has a larger angle, forming greater resistance , making it difficult for the electrode body 1 to come out. For the lateral movement of the electrode body 1 in the direction perpendicular to the electrode body 1, the protrusions 6, 6' at the tail end 3 of the electrode body 1 increase the resistance of the front end 2 of the electrode body 1 to move laterally in the tissue, so it can also play a role Certain restrictions. At the same time, since the protrusions 6, 6' are installed at the tail end 3 of the electrode body 1, there is still a certain distance from the electrode point 4 located at the front end 2 of the electrode body 1, so the insertion damage near the electrode point 4 will not be increased. In this way, the plurality of protrusions 6, 6' on the tail end 3 of the electrode body 1 can increase the positional stability relationship between the electrode point 4 and the stimulation or recording object, and reduce the signal noise caused by the movement of the electrode body 1.

The above-mentioned embodiments are only examples for convenience of description, and the scope of rights claimed by the utility model should be determined by the scope of the claims, rather than being limited to the above-mentioned embodiments.

Claims (9)

1. A needle-like neural microelectrode with a position-stabilizing structure, characterized in that it comprises: An electrode body, the electrode body is needle-shaped, has a front end and a tail end, and a plurality of protrusions are fixed along the same section on the outer wall of the electrode body near the tail end; A plurality of electrode points, the plurality of electrode points are coated on the surface of the electrode body, and each electrode body is connected to the tail end of the electrode body with a conductive wire coated on the surface of the electrode body; an insulating layer, which is coated on the surface of the electrode body and covers the conductive wire; The plurality of electrode points are exposed on the insulating layer. 2. The needle-shaped neural microelectrode with position stabilizing structure according to claim 1, wherein the electrode body is made of silicon or metal or glass material. 3. The needle-shaped neural microelectrode with position stabilizing structure according to claim 1, wherein the cross-sectional shape of the electrode body is circular, elliptical or polygonal. 4. The needle-shaped neural microelectrode with a position stabilizing structure according to claim 1, wherein the number of protrusions on the electrode body is 1-4. 5. The needle-shaped nerve microelectrode with a position stabilizing structure according to claim 1 or 4, wherein the electrode body and the plurality of protrusions are integrally formed. 6. The needle-shaped neural microelectrode with a position stabilizing structure according to claim 1 or 4, wherein the electrode body and the protrusions are welded or bonded. 7. The needle-shaped neural microelectrode with a position stabilizing structure according to claim 1 or 4, wherein the plurality of protrusions are wing-shaped triangles, and the included angle of the triangles pointing to the front end is an acute angle. 8. The needle-shaped neural microelectrode with a position-stabilizing structure as claimed in claim 1 or 4, wherein the plurality of protrusions are in the shape of wing-shaped pieces, and the included angle between the wing-shaped pieces and the front end is an acute angle . 9. The needle-shaped neural microelectrode with a position-stabilizing structure according to claim 1, wherein the number of the plurality of electrode points is 1-50.

Images