CN102894976A - Circular array electrode for brain electrical impedance tomography - Google Patents

Abstract

The invention discloses an electrode for brain electric impedance tomography with a circular array, which is composed of a metal base, a probe array, a coating at the front end of the probe, and coatings arranged on the outside of the metal base and each probe. There are 9 probes fixed on the front of the metal base of an electrode, and snap buttons are welded on the back for easy connection. The front ends of the 9 probes are covered with a water-absorbing layer, which can absorb conductive paste or NaCl solution. The probe is structured so that electrodes can be measured through the hair for electrical impedance tomography of the brain that does not require shaving.

Description

A circular array electrode for brain electrical impedance tomography

technical field

The invention belongs to the field of electrical measurement, and relates to an imaging electrode, in particular to a circular array brain electric impedance tomography electrode.

Background technique

In terms of disease detection, modern medical imaging technology represented by CT and MRI has played an active and key role, providing important reference value for the diagnosis and treatment of diseases. However, due to the large size, high cost and inconvenient operation of these instruments and equipment, most of them can only be detected when the patient has a major condition change. It is difficult to detect the condition early, and it is even more difficult to achieve a large-scale rapid screening.

Electrical impedance tomography (EIT) is an imaging technique for estimating two-dimensional or three-dimensional electrical properties in vivo by means of body surface measurements. Because the technology uses safe weak AC signal excitation, it is non-invasive and harmless to the human body. At the same time, compared with the existing imaging equipment, it has the advantages of simple structure, easy operation, compact equipment, fast imaging speed, low system cost and functional imaging. It is an imaging technology with broad application prospects. And its characteristics make it very suitable for the prevention and screening of diseases.

The current brain electrical impedance tomography electrode uses a metal cup-shaped Ag/AgC1 electrode. Before placing the electrode, all hair must be cut off, which is obviously not suitable for large-scale applications.

According to foreign literature reports, there is currently a dry electrode that can perform brain EIT imaging without skin preparation. However, at the cost of piercing the stratum corneum, it has certain damage to the skin, may cause the spread of skin diseases, and make the subjects' skin red and swollen, so it is not suitable for use in disease screening.

Therefore, the current electrodes cannot be used for brain disease screening in EIT. There is a need for an efficient and fast electrode that can be used for rapid detection of brain EIT with little or no hair shaving.

Contents of the invention

The purpose of the present invention is to provide a circular array of electrodes for brain electrical impedance tomography, which does not need to shave and prepare the skin of the subject, but directly inserts the imaging electrode into the hair of the subject. The measurement extracts the brain electrical impedance information of the subject.

In order to realize above-mentioned task, the technical scheme that the present invention adopts is:

A circular array electrode for brain electrical impedance tomography, characterized in that it consists of a probe covered with Ag/Agcl plating and a base, and the probes are arranged in the center of a circle and the circumference on the base, wherein the probes on the circumference Evenly distributed, the front end of the probe has a hydrophilic coating fixed by an elastic ring, and the other side of the base is connected with a snap button.

Both the probe and the base are made of copper or Ag, the outer surface is plated with Agcl, the hydrophilic coating at the front end is made of sponge or gauze, and the elastic ring is made of elastic rubber.

The diameter of the metal base is 20mm, the diameter of each probe above is 3mm, and the 8 probes on the circumference form a ring, and the center of circle of the 8 probes is 7mm from the center of the base.

Compared with the prior art, the electrode for circular array brain electrical impedance tomography of the present invention has the advantage that it can be directly inserted into the hair of the measured object during use, and does not need to shave and prepare the skin of the measured object. There will be no error introduced due to the thickness of the hair, and no damage to the skin. Therefore, not only can the steps of brain EIT imaging be simplified, but also more accurate and real brain imaging results can be provided.

Description of drawings

Fig. 1 is a structural diagram of the electrode for brain electrical impedance tomography with a circular array according to the present invention. The unit of the dimensions in the drawing is mm.

Figure 2 is a schematic diagram of the structure of a probe.

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Detailed ways

Referring to Fig. 1 and Fig. 2, the present embodiment provides a structure of a circular array electrode for brain electrical impedance tomography, which consists of a cylindrical probe 1 and a base 2 covered with Ag/Agcl plating, and the cylindrical probe 1 are arranged on the base 2 in the form of a circle center and a circle, wherein the cylindrical probes 1 are evenly distributed on the circumference, and the front end of the cylindrical probe 1 has a hydrophilic coating 3 fixed by an elastic ring 4, and the other part of the base 2 Snap fastening at one side.

In this embodiment, the diameter of the metal base is 20 mm, and the diameter of each probe above is 3 mm. The 8 probes on the circumference form a ring shape, and the distance between the center of the 8 probes and the center of the base is 7 mm. Both the outer surfaces of the base 2 and the probe 1 are coated with Ag/AgCl. The hydrophilic coating 3 at the front end is made of sponge or gauze, and the elastic ring 4 is made of elastic rubber.

The water-absorbing coating 3 on the cylindrical probe 1 can absorb the conductive paste, make it inserted into the hair, and closely contact the skin of the human brain. The snap button on the other side can be connected to the fixed electrode belt, so that the cylindrical probe 1 can be tightly pressed against the outside of the human brain.

When in use, first dip the hydrophilic coating 3 on the electrode for brain electric impedance tomography of the circular array with an appropriate amount of conductive paste or Nacl solution, and then fix it on the electrode belt through the snap button, and pass the electrode with tightness. The belt can place 16 identical circular arrays of electrode bundles for brain electrical impedance tomography at appropriate positions in the human brain. The angle and position of the electrodes for brain electrical impedance tomography of the circular array are adjusted, so that each electrode of the circular array of electrical impedance tomography of the brain protrudes into the hair, and the hydrophilic layer is in close contact with the scalp.

The circular array brain electrical impedance tomography electrode of this embodiment is connected to the detection wire from the electrode belt to perform electrical impedance imaging.

In the circular array brain electrical impedance tomography electrode of this embodiment, both the cylindrical probe 1 and the base 2 are made of copper or silver material, which is convenient for processing on the one hand, and can make the electrode have excellent conductivity on the other hand. resistance, lower electrical impedance.

During production, the diameter of the cylindrical probe 1 should not be too large. If the diameter is too large, it will not be able to penetrate into the hair, which will cause the front end of the cylindrical probe 1 to press on the hair, which will affect the measurement results; the cylindrical probe 1 The diameter should not be too small. If the diameter is too small, on the one hand, it is not conducive to processing, on the other hand, the contact area is too small, and the current density increases, thus affecting the imaging results. After simulation analysis and actual inspection, it is appropriate to choose the diameter of the cylindrical probe 1 as 3mm.

In order to ensure good contact between the front end of the measuring probe 1 and the contact area of the human brain and skin, the front end of the probe 1 has a water-absorbing coating to absorb the conductive paste or Nacl solution, thereby reducing the contact impedance. And the soft water-absorbing layer makes the measuring probe more comfortable without pinprick feeling.

The above embodiment is only used to help understand the present invention, and the present invention is not limited to this embodiment. Those skilled in the art can correct, add and replace the size and structure of the above-mentioned circular array brain electrical impedance tomography electrodes. , should be regarded as the protection scope of the present invention.

Claims (5)

1. circular array brain electrical impedance tomography electrode, it is characterized in that, consisted of by the probe that is coated with Ag/Agcl coating and base, probe is the center of circle and the circumference mode is arranged at base, wherein the probe on the circumference evenly distributes, the front end of described probe has the fixing hydrophilic coating of loose collar, and the opposite side of base is connected with snap-fastener.

2. circular array brain electrical impedance tomography electrode as claimed in claim 1 is characterized in that the diameter of described metab is 20mm, and the diameter of each probe is 3mm, and the center of 8 probe distance of center circle bases on the circumference is 7mm.

3. circular array brain electrical impedance tomography electrode as claimed in claim 1, it is characterized in that the hydrophilic coating on the described probe, the hair that is used for absorbing conductive paste and injects human body, be contacted with on the human brain skin, the snap-fastener of opposite side is connected on the fixed electrode band.

4. circular array brain electrical impedance tomography electrode as claimed in claim 1, it is characterized in that: described probe and base are made by copper or Ag, outer surface plating Agcl.

5. circular array brain electrical impedance tomography electrode as claimed in claim 1, it is characterized in that: described hydrophilic coating is made of sponge or gauze, and described loose collar is made by gum elastic.

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