Saline water Laplace electrode device and saline water electrode equipment

Abstract

The utility model provides a salt water Laplace electrode device and salt water electrode equipment, the electrode device comprises a first electrode and a second electrode, and a salt water holding assembly comprises an outer ring holding piece contacted with the first electrode, an inner ring holding piece contacted with the second electrode, and a separator for separating the two salt water holding pieces. And through the supporting and limiting effects of the supporting and limiting parts and the isolation parts, the outer ring retaining part after absorbing the saline water, the isolation parts and the inner ring retaining part after absorbing the saline water can form a plurality of concentric circle structures, so that the bipolar concentric circle Laplace electrode can be formed, the spatial resolution of a target position acquisition signal is improved, and the detection accuracy is improved. And interference caused by signals at other positions is inhibited, so that the quality of the electroencephalogram / electromyographic signals can be further improved, and a favorable tool is provided for related research.

Description

Technical Field

[0001] This utility model belongs to the field of electrode technology, specifically relating to a saline Laplace electrode device and a saline electrode equipment. Background Technology

[0002] Compared to modalities like MRI, EEG is generally considered to have high temporal resolution but low spatial resolution. Improving spatial resolution is costly, typically requiring increasing the number of leads, but current 128-lead and 256-lead EEG devices are very expensive. Furthermore, due to spatial conduction effects, the EEG signal-to-noise ratio is reduced. In EEG devices with multiple electrodes, all source signals alias at each electrode, distorting the true EEG response to its location. For example, this can lead to significant errors in calculating the scalp telebrain network.

[0003] One proven method to effectively improve spatial resolution and reduce spatial conduction effects is the fabrication of Laplace electrodes. Currently, commonly used Laplace electrodes are bipolar concentric ring structures, with a central disk and a larger diameter ring on the other pole; both are responsible for conducting electricity, while the space between them is insulated.

[0004] However, the biggest challenge in the application of Laplace electrodes is that while their theoretical effectiveness has been proven, their structural design falls short of practical application. The bipolar conductive parts need to be in contact with the scalp simultaneously. If conductive gel is used, the close proximity of the two components makes it difficult to prevent short circuits. Without conductive gel, good contact with the scalp is difficult, especially in subjects with thick hair. Utility Model Content

[0005] This invention addresses the aforementioned problems by proposing a novel Laplace electrode design. It introduces a saline-absorbing retaining element, such as a sponge, as an intermediate conductive medium, transforming the contact between the conductive element and the scalp into contact between the sponge and the scalp. Unlike conductive gels, whose shape is uncontrollable, the shape of the sponge is controllable. Maintaining contact between the sponge and the conductive element, and between the sponge and the scalp, is sufficient to achieve this contact. The sponge's shape can be fixed using a limiting device, projecting corresponding bipolar concentric rings onto the scalp to achieve the Laplace electrode design effect. Furthermore, it is simple to use; simply soaking in saline solution is sufficient. Specifically, this invention employs the following technical solution:

[0006] This utility model provides a saline Laplace electrode device, which has the following technical features: the electrode device includes: an electrode base; a first electrode and a second electrode, respectively disposed in the electrode base; a supporting and limiting member connected to the electrode base and having a receiving cavity; and a saline holding assembly disposed in the receiving cavity for absorbing and holding saline, wherein the saline holding assembly includes: an outer ring holding member, which is hollow cylindrical and has one end in contact with the first electrode; an inner ring holding member, which is nested inside the outer ring holding member and is cylindrical, with one end in contact with the second electrode; and an isolation member, which is hollow cylindrical and disposed between the nested outer ring holding member and the inner ring holding member for isolating them, wherein the outer ring holding member, the isolation member, and the inner ring holding member are coaxial and form multiple concentric circle structures, thereby forming a Laplace electrode.

[0007] The saline Laplace electrode device provided by this utility model may also have the following technical features: the outer ring retainer and the inner ring retainer expand uniformly after absorbing saline, and the receiving cavity is a cylindrical cavity with a uniform inner diameter, used to support and limit the outer ring retainer.

[0008] The saline Laplace electrode device provided by this utility model may also have the following technical features: the outer diameter of the outer ring retainer is 8mm to 20mm, and the inner diameter is 5mm to 19mm accordingly; the diameter of the inner ring retainer is 1mm to 5mm; and the isolation member is made of an insulating and waterproof material, or has an insulating and waterproof coating.

[0009] The saline Laplace electrode device provided by this utility model may also have the following technical features: the outer ring retainer and the inner ring retainer are both sponges, and the isolation member is a plastic cylindrical part.

[0010] The saline Laplace electrode device provided by this utility model may also have the following technical features: the electrode base includes a disc portion and a protrusion extending from the center of one surface of the disc portion; the protrusion has a cylindrical portion; the electrode base has a through electrode mounting hole in the center; the first electrode is an annular electrode disposed on the outer periphery of the cylindrical portion; and the second electrode is a strip-shaped electrode disposed in the electrode mounting hole.

[0011] The saline Laplace electrode device provided by this utility model may also have the following technical features: the electrode device further includes an active device, which is electrically connected to the first electrode and the second electrode respectively, and has a through hole in its middle. The other surface of the disc portion has a device receiving groove, which communicates with the electrode assembly hole. The active device is accommodated in the device receiving groove, and one end of the second electrode passes through the through hole and is fixed to the active device.

[0012] The saline Laplace electrode device provided by this utility model may also have the following technical features: the electrode device further includes: an end cap that matches the disc portion, wherein another surface of the disc portion has a lead wire receiving groove communicating with the device receiving groove, the lead wire connected to the active device is accommodated in the lead wire receiving groove, the device receiving groove and the lead wire receiving groove are provided with sealing portions for waterproof sealing of the active device and the connection portion between the active device and the lead wire, and the end cap is disposed on the disc portion for shielding the device receiving groove and the lead wire receiving groove.

[0013] The saline Laplace electrode device provided by this utility model may also have the following technical features: the end of the protrusion connected to the disc portion has an outer annular groove, one side wall of the outer annular groove is a limiting surface facing the disc portion, one end of the supporting limiting member has an assembly hole, and the end of the supporting limiting member is interference-fitted into the outer annular groove through the assembly hole; one surface of the disc portion and the limiting surface are used to limit the supporting limiting member.

[0014] The saline Laplace electrode device provided by this utility model may also have the following technical features, wherein the first electrode and the second electrode are both signal acquisition electrodes, preferably silver / silver chloride electrodes.

[0015] This utility model provides a saline electrode device, which has the following technical features: the device includes: one or more electrode devices for acquiring signals from a subject; and an elastic fixing part for fixing the electrode devices to the subject's body surface, wherein one or more of the electrode devices are any of the saline Laplace electrode devices described above.

[0016] Functions and effects of utility models

[0017] According to the saline Laplace electrode device and saline electrode equipment provided by this utility model, since the electrode device includes a first electrode and a second electrode, and the saline holding assembly includes an outer ring holding member in contact with the first electrode, an inner ring holding member in contact with the second electrode, and an isolating member separating the two saline holding members, and through the supporting and limiting functions of the supporting and limiting member and the isolating member, the outer ring holding member, the isolating member, and the inner ring holding member after absorbing saline can form multiple concentric circle structures, thus forming a bipolar concentric ring Laplace electrode, improving the spatial resolution of the signal acquired at the target location, suppressing interference from signals at other locations, suppressing spatial conduction effects, thereby further improving the quality of EEG / EMG signals, and providing a useful tool for related research. In addition, the structures of the outer ring holding member, the isolating member, and the inner ring holding member are relatively simple, and they can be nested to form the above-mentioned saline holding assembly, so the electrode device is also easy to manufacture and assemble. Moreover, the electrode device is also convenient and quick to use, retaining the advantages of saline electrodes, and can be used simply by soaking in saline. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the brine electrode device in an embodiment of this utility model;

[0019] Figure 2 This is an exploded view of the structure of the saline Laplace electrode device in this embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional view of the brine Laplace electrode device in an embodiment of this utility model;

[0021] Figure 4 This is a perspective view of the electrode holder in an embodiment of this utility model;

[0022] Figure 5 This is an exploded view of the brine retention component in an embodiment of this utility model;

[0023] Figure 6 This is a schematic diagram of the elastic band in an embodiment of this utility model.

[0024] Figure label:

[0025] A saline electrode device 100; a saline Laplace electrode assembly 10; an electrode holder 11; a disc portion 111; a protrusion 112; a first cylindrical portion 1121; a second cylindrical portion 1122; an outer ring groove 1123; a limiting surface 1123a; a receiving portion 113; a device receiving groove 1131; a lead wire receiving groove 1132; a barb 114; an electrode mounting hole 115; an end cap 12; a first electrode 13; a second electrode 14; an active device 15; a supporting and limiting component 16; an assembly hole 161; a retainer receiving cavity 162; a saline retainer assembly 17; an outer ring retainer 171; an inner ring retainer 172; and an isolator 173. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the following describes the saline Laplace electrode device and saline electrode equipment of this utility model in detail with reference to the embodiments and accompanying drawings.

[0027] <Example>

[0028] Figure 1 This is a schematic diagram of the brine electrode device in this embodiment.

[0029] like Figure 1 As shown, in this embodiment, the saline electrode device 100 includes multiple saline Laplace electrode devices 10 and an elastic fixing part 20. The saline Laplace electrode devices 10 are used to achieve high-quality, high spatial resolution signal acquisition, for example, they can be used for electroencephalogram (EEG) or electromyography (EMG) signal acquisition. The elastic fixing part 20 is used to fix the multiple saline Laplace electrode devices 10 at predetermined positions on the human body surface.

[0030] Figure 2 This is an exploded view of the brine Laplace electrode device in this embodiment. Figure 3 This is a cross-sectional view of the saline Laplace electrode device in this embodiment.

[0031] like Figure 2 and Figure 3 As shown, the saline Laplace electrode device 10 (hereinafter referred to as electrode device 10) includes an electrode base 11, an end cap 12, a first electrode 13, a second electrode 14, an active device 15, a support and limiting member 16, and a saline holding assembly 17.

[0032] Figure 4 This is a perspective view of the electrode holder in this embodiment.

[0033] like Figures 2 to 4 As shown, the electrode holder 11 includes a disc portion 111, a protrusion 112, a receiving portion 113, a plurality of barbs 114, and an electrode mounting hole 115.

[0034] The disc portion 111 is in the shape of a circular plate.

[0035] The protrusion 112 protrudes outward from the center of one surface of the disk portion 111. The protrusion 112 includes a first cylindrical portion 1121 and a second cylindrical portion 1122 that are connected to the disk portion 111. The two cylindrical portions and the disk portion 111 are coaxially arranged, and the diameter of the first cylindrical portion 1121 is relatively smaller. Therefore, an outer annular groove 1123 is formed at the end of the protrusion 112 that is connected to the disk portion 111. One side wall of the outer annular groove 1123 is a limiting surface 1123a facing the disk portion 111. The limiting surface 1123a is an annular surface perpendicular to the axial direction of the protrusion 112.

[0036] The receiving portion 113 protrudes outward from another surface of the disk portion 111 and is in the shape of an irregular frame, including a rectangular frame portion and a strip frame portion. A rectangular groove is formed in the rectangular frame portion, which is the device receiving groove 1131. An elongated groove communicating with the device receiving groove 1131 is formed in the strip frame portion, which is the lead receiving groove 1132. The lead receiving groove 1132 forms a wire outlet at the edge of the disk portion 111.

[0037] Multiple barbs 113 are formed on the outer edge of the protrusion 112 and are evenly distributed along the edge (a circumference). Each barb 113 is triangular pyramidal and extends obliquely from the outer end of the protrusion 112 toward the disc portion 111. In this embodiment, there are four barbs 113. Optionally, the seat 11 may not have barbs 113.

[0038] The electrode mounting hole 115 is a circular through hole that passes through the disc portion 111 and the protrusion 112. One end of the hole is located in the middle of the bottom of the device receiving groove 1131, and the other end is located in the middle of the outer end face of the protrusion 112.

[0039] The end cap 12 is circular and matches the disk portion 111. It is used to be installed on the disk portion 111 to cover the device receiving groove 1131 and the lead receiving groove 1132, thereby protecting the active device and lead wires housed therein.

[0040] Both the first electrode 13 and the second electrode 14 are electrodes for signal acquisition and can be made of existing signal acquisition electrode materials, such as silver / silver chloride electrodes, which have good conductivity and stability.

[0041] In this embodiment, the first electrode 13 is an annular electrode, disposed on the outer periphery of the second cylindrical portion 1122 of the protrusion 112, and located above the plurality of barbs 114. The first electrode 13 can be formed, for example, by coating the outer peripheral surface of the second cylindrical portion 1122 with silver / silver chloride paste and then heating and curing it, repeating this process multiple times.

[0042] The second electrode 14 is a slender cylindrical or hollow cylindrical electrode with a diameter smaller than that of the electrode mounting hole 115, and a significant difference between its diameter and the inner diameter of the first electrode 13. The second electrode 14 is disposed in the electrode mounting hole 115 and passes through the inner ring of the first electrode 13.

[0043] Optionally, the second electrode 14 can be fixed in the electrode mounting hole 115 using an electrode fixing component. The electrode fixing component can be, for example, a drum spring with a waterproof coating, fitted onto the middle or lower end of the second electrode 14. Inserting the electrode 14 with the drum spring fitted into the electrode mounting hole 115 achieves fixation. Alternatively, the electrode fixing component can be a magnetic or snap-fit ​​component, with a corresponding magnet in the electrode holder or a corresponding snap-fit ​​structure (e.g., a slot or bayonet) in the electrode mounting hole, also achieving a fixing effect. Alternatively, after assembling the electrode 14, the electrode mounting hole 115 can be sealed with adhesive, i.e., filling the annular gap between the outer periphery of the electrode 14 and the inner wall of the electrode mounting hole 115 with adhesive to form a seal.

[0044] The active device 15 is a rectangular circuit board used in conjunction with the electrode, with a through hole in its center. The second electrode 14 passes through the through hole in the center of the active device 15 and is soldered and fixed to the active device 15 at the edge of the through hole. It is also electrically connected to the circuitry on one surface of the active device 15. A lead wire extends from one side of the active device 15, and the second electrode 14 is connected to external signal acquisition equipment, etc., through this lead wire. The first electrode 14 can be electrically connected to the circuitry on the active device 15 via a conductive wire, and then connected to external devices via a lead wire extending from the active device 15, or it can be directly connected to external devices via a lead wire.

[0045] The active device 15 is housed in the device receiving groove 1131 of the electrode holder 11. A lead wire extending from one side of the active device 15 is housed in the lead wire receiving groove 1132 and extends to the outside of the electrode mounting device 10. Preferably, the device receiving groove 1131 matches the shape of the active device 15, and the active device 15 is fitted and fixed in the device receiving groove 1131. The through hole in the middle of the active device 15 is approximately aligned axially with the electrode mounting hole 115, so that the second electrode 14, which is fixed to the active device 15, is approximately coaxially arranged with the electrode holder 11. There is an annular gap between the outer peripheral surface of the second electrode 14 and the inner wall of the electrode mounting hole 115, and the two do not contact each other.

[0046] In addition, adhesive is injected into the device receiving groove 1131 where the active device 15 is placed and into the lead receiving groove 1132 where the lead wire is provided, so that the adhesive completely covers the active device 15, one end of the lead wire and the connection between the active device 15 and the lead wire, and dehydrates and cures, thereby waterproofing and sealing them.

[0047] The support and limiting member 16 is used to support and limit the brine holding assembly 17. It is cylindrical with a uniform diameter, open at one end and semi-closed at the other end. The middle of the other end has a mounting hole 161, which is a circular through hole. Preferably, the diameter of the mounting hole 161 is slightly smaller than the outer diameter of the smaller section of the protrusion 112. A cylindrical holding member receiving cavity 162 is formed inside the support and limiting member 16. The inner diameter of the support and limiting member 16 is uniform, that is, the sidewall of the holding member receiving cavity 162 is basically cylindrical.

[0048] The support limiting member 16 is fitted onto the first cylindrical portion 1121 of the protrusion 112 of the electrode holder 11 through the mounting hole 161, that is, the mounting hole 161 is fitted into the outer annular groove 1123, and the support limiting member 16 is coaxially arranged with the electrode holder 11. Preferably, the mounting hole 161 and the first cylindrical portion 1121 are interference-fitted to achieve a certain sealing effect and to make the connection between the support limiting member 16 and the electrode holder 11 more secure. At this time, the movement of the support limiting member 16 toward the disk portion 111 will be limited by one surface of the disk portion 111 (that is, it can only move up to one end abutting against the lower surface of the disk portion 111), and the movement in the opposite direction (that is, the direction that would cause the support limiting member 16 and the saline holding assembly 17 to detach from the electrode holder 11) will be limited by the limiting surface 1123a.

[0049] In this embodiment, the support limiting member 16 is made of transparent or semi-transparent silicone material, which has good compatibility with the human body. The edge of the other end of the support limiting member 16 is rolled outward to form a flange, so that the support limiting member 16 forms an elastic suction cup structure, which can also play a role in adsorbing and fixing to the surface of the human body to a certain extent when in use.

[0050] Figure 5 This is an exploded view of the brine retention component in this embodiment.

[0051] like Figure 2 , Figure 3 and Figure 5 As shown, the brine retaining assembly 17 includes an outer retainer 171, an inner retainer 172, and a separator 173.

[0052] The outer retainer 171 and the inner retainer 172 are made of a material that can absorb and expand with brine, such as a sponge. In the initial state before absorbing brine, the outer retainer 171 is a hollow cylinder with a certain wall thickness, and the inner retainer 172 is a solid cylinder, with both having essentially the same axial length. The inner retainer 172 is nested inside the outer retainer 171.

[0053] The separator 173 is made of an insulating and waterproof material or has an insulating and waterproof coating, and is also in the shape of a hollow cylinder, such as a plastic cylinder with a certain thickness, for fitting between the nested outer ring retaining member 171 and the inner ring retaining member 172 to isolate the two.

[0054] After fully absorbing the saline solution, the outer retainer 171 and the inner retainer 172 expand uniformly. Under the support and limiting action of the support limiting member 16 and the isolation member 173, the outer retainer 171 remains in a hollow cylindrical shape, and the inner retainer 172 remains in a solid cylindrical shape. One end of the outer retainer 171 and the inner retainer 172 extends slightly outward from the opening end of the support limiting member 16, while one end of the isolation member 173 is roughly flush with or slightly lower than the opening end of the support limiting member 16, that is, located inside the opening end. Thus, when the electrode device 10 is placed on the human body surface, under the pressure of the elastic fixing part 20, one end of the saline solution retaining assembly 17 is pressed tightly against the body surface, and both sponges can fully contact the body surface.

[0055] Figure 3 Part a shows a radial cross-sectional view of the electrode assembly 10. Figure 3 Part b in the diagram shows a cross-sectional view of the electrode assembly 10 along the axial direction, and Figure 3 The correspondence between the two sectional views is also shown in the diagram.

[0056] like Figure 3 As shown, in this embodiment, the outer diameter of the isolator 173 is basically the same as the outer diameter of the second cylindrical portion 1122 of the protrusion 112, and the inner diameter of the isolator 173 is basically the same as the diameter of the electrode mounting hole 115. Since the outer ring retainer 171 and the inner ring retainer 172 expand relatively evenly after absorbing the saline solution, and are supported and limited by the support and limiting member 16 and the isolator 173, after fully absorbing the saline solution, the isolator 173 is approximately coaxial with the electrode seat 11. One end of the outer ring retainer 171 is in full contact with the first electrode 14 on the outer periphery of the protrusion 112 (at least in contact with the lower surface of the first electrode 14, and optionally in contact with both the lower surface and the outer periphery of the first electrode 14 at the same time), and one end of the inner ring retainer 172 is in full contact with one end of the second electrode 14.

[0057] from Figure 3Looking at part b (axial cross-sectional view), the inner retainer 172 has a circular cross-section, the isolator 173 has an annular cross-section, and the outer retainer 171 has an annular cross-section. These circles and annular rings are concentric, meaning that the saline retainer assembly 17 maps the two electrodes into a bipolar concentric ring Laplace electrode. The Laplace electrode enhances the spatial resolution of the local field potential through differential recording, suppressing interference from distant signals. Therefore, it can obtain signals with better spatial resolution. Furthermore, for example, when applied to EEG signal acquisition, it can better focus on the signal acquisition of the target brain region, reducing interference from signals from other nearby brain regions.

[0058] Accordingly, the active device 15 may include a differential amplifier circuit to extract the potential difference between the first electrode 13 and the second electrode 14 and suppress common-mode interference.

[0059] In this embodiment, the overall width of the electrode device 10 (i.e., the diameter of the disk portion 111) is approximately 10mm to 18mm, preferably 10mm, and the overall axial height is 10mm to 15mm, preferably 8mm. The first electrode 14 has a diameter of approximately 8mm to 13mm and an axial length of 2mm to 4mm; the second electrode 15 has a diameter of approximately 2mm to 4mm and an axial length of 8mm to 12mm. Therefore, the two electrodes are placed closely together to form a Laplace electrode, and the relatively small size of each electrode achieves higher spatial resolution while avoiding excessively small size that could lead to a low signal-to-noise ratio.

[0060] In the brine retaining assembly 17, the outer diameter of the outer ring retainer 171 is approximately 8 mm to 20 mm, and the inner diameter is correspondingly approximately 5 mm to 19 mm; the diameter of the inner ring retainer 172 is correspondingly approximately 1 mm to 5 mm. Therefore, there is sufficient spacing between the outer ring retainer 171 and the inner ring retainer 172 to stably form a Laplace electrode.

[0061] According to the tests conducted by the inventors, the saline Laplace electrode device 10 of this embodiment can improve the spatial resolution by more than 40% compared with the existing saline electrode.

[0062] Figure 5 This is a schematic diagram of the elastic band in an embodiment of this utility model.

[0063] like Figure 1 and Figure 5As shown, the elastic fixing part 20 is used to fix multiple electrode devices 10 to predetermined positions on the human body surface. In this embodiment, the saline electrode device 100 is an EEG cap, and the elastic fixing part 20 is generally a hemispherical mesh that completely covers the top of the human head, formed by a combination of multiple elastic bands. The elastic fixing part 20 is made of a human-friendly elastic material, such as silicone.

[0064] The elastic fixing part 20 can be composed of multiple elastic bands 21 with similar structures. Each elastic band 21 has two annular sheet-like portions 211 at both ends and a long strip-shaped portion 212 connecting the two annular sheet-like portions 211 in the middle. A circular mounting hole 2111 is formed in the middle of the annular sheet-like portion 211. The diameter of the mounting hole 2111 is approximately equal to or slightly smaller than the diameter of the thinner segment of the protrusion 112.

[0065] In an alternative, the elastic fixing part 20 can also be integrally formed, that is, it includes a plurality of the above-mentioned annular sheet-like parts 211, each annular sheet-like part 211 having a plurality of the above-mentioned elongated sheet-like parts 212 extending from its edge, and the elongated sheet-like parts 212 being interconnected with other annular sheet-like parts 211.

[0066] Before use, the electrode base 11, end cap 12, first electrode 13, second electrode 14, and active device 15 of the saline Laplace electrode device 10 can be pre-assembled into a single device body 10A. Then, the protrusion 112 of the device body 10A passes through one of the mounting holes 2111 from one side of the elastic fixing part 20. On the other side of the elastic fixing part 20, the support limiting member 16 is fitted onto the protrusion 112 through the mounting hole 161 until the mounting hole 161 is positioned at the outer annular groove 1123. Finally, the non-absorbed saline retaining component 17 is approximately secured in the retaining cavity 162 of the support limiting member 16, thus completing the assembly of a saline Laplace electrode device 10. After installing the saline Laplace electrode device 10 in all required positions, the desired saline electrode device 100 is formed.

[0067] In use, the saline electrode device 100 can be immersed in saline solution to ensure that the outer retainer 171 and inner retainer 172 fully absorb the saline solution and remain in a saline-soaked state. The immersed saline electrode device 100 is then worn on the subject's body surface, and the leads of each electrode device 10 are connected to a signal acquisition device. Signal acquisition from the subject can then be performed using these electrode devices 10. The saline electrode device 100 can be, for example, an electroencephalogram (EEG) electrode device or an electromyogram (EMG) electrode device. After fully absorbing water and expanding, the outer retainer 171 is tightly fitted between the inner wall of the support and limiting member 16 and the outer wall of the insulating member 173. One end of the outer retainer 171 abuts against the lower surface of the first electrode 13 and may contact part or all of the outer peripheral surface of the first electrode 13. Multiple barbs 114 are also embedded in this end of the outer retainer 171 to limit and fix it, preventing it from falling off during use. After the inner ring retainer 172 has fully absorbed water and expanded, it tightly fits the inner ring of the separator 173, and one end of the second electrode 14 is inserted into one end of the inner ring retainer 172.

[0068] As described above, since the end of the support limiting member 16 with the mounting hole 16 is limited to move in two directions through the disc portion 111 and the limiting surface 1123a, and in particular, the limiting surface 1123a can prevent it from falling off, and the brine holding assembly 17 is locked in the inner cavity of the support limiting member 16 after absorbing brine, it will basically not fall off due to axial force during use. Therefore, the electrode seat 11 does not need to be provided with multiple barbs 114, and its structure can be further simplified.

[0069] Furthermore, when the electrode holder 11 does not have barbs 114, the outer end of the protrusion 112 is cylindrical, and the first electrode 13 can be a pre-made annular electrode that can be directly fitted onto the protrusion 112.

[0070] After one subject has finished using the device, the saline retention component 17 in the electrode device 10 can be removed and discarded, and a new saline retention component 17 can be installed. The EEG cap can then be soaked in saline again and used for the next subject. The isolator 173 in the saline retention component 17 can also be retained for reuse, meaning only the two sponge components need to be discarded. Alternatively, the support limiting part 16 and the saline retention component 17 can be discarded together, ensuring that all parts that came into direct contact with the previous subject's skin are discarded and replaced, thus avoiding cross-infection. In other words, when switching subjects, only the sponge or suction cup needs to be discarded, which is a low-cost component, while the relatively expensive components such as the base 11, the first electrode 13, the second electrode 14, and the active device 15 can be retained and reused multiple times. Furthermore, the operations of assembling the electrode device 10 onto the elastic fixing part 20, inserting or removing the saline retention component 17, and removing and replacing the support limiting part 16 and the saline retention component 17 together can all be performed manually without the need for specific tools.

[0071] The role and effect of the embodiments

[0072] According to the saline Laplace electrode device and saline electrode equipment provided in this embodiment, since the electrode device includes a first electrode and a second electrode, and the saline holding assembly includes an outer ring holding member in contact with the first electrode, an inner ring holding member in contact with the second electrode, and an isolating member separating the two saline holding members, and through the supporting and limiting functions of the supporting and limiting member and the isolating member, the outer ring holding member, the isolating member, and the inner ring holding member after absorbing saline can form multiple concentric circle structures, thus forming a bipolar concentric ring Laplace electrode, improving the spatial resolution of the signal acquired at the target location, suppressing interference from signals at other locations, suppressing spatial conduction effects, thereby further improving the quality of EEG / EMG signals and providing a useful tool for related research. In addition, the structures of the outer ring holding member, the isolating member, and the inner ring holding member are relatively simple, and they can be nested to form the above-mentioned saline holding assembly, so the electrode device is also easy to manufacture and assemble. Moreover, the electrode device is also convenient and quick to use, retaining the advantages of saline electrodes, and can be used simply by soaking in saline.

[0073] In this embodiment, the support and limiting functions are achieved by a cylindrical support and limiting component with an inner cavity and a hollow cylindrical isolation component. Meanwhile, both the outer and inner retaining components are sponges that can expand relatively evenly after absorbing salt water. Therefore, as long as the salt water retaining component is assembled in the inner cavity of the support and limiting component, it can naturally form multiple concentric circle structures after being fully soaked and absorbed by the salt water, thus forming a Laplace electrode. No manual processing or adjustment is required, making it very convenient and reliable to use.

[0074] Furthermore, the separator is made of an insulating and waterproof material, or has an insulating and waterproof coating, thus effectively isolating the two brine retainers that absorb brine. The separator can be, for example, an existing plastic sleeve, which is very inexpensive. And, because of the thickness of the separator, a sufficient gap can always be maintained between the outer and inner retainers, thereby stably forming the Laplace electrode.

[0075] Furthermore, the first electrode is an annular electrode formed on the outer periphery of the protrusion of the electrode holder, and the second electrode is a slender cylindrical electrode that passes through the electrode mounting hole of the electrode holder. Therefore, while effectively isolating the two electrodes, the nested electrodes can be placed tightly, thereby forming the differential record required for the Laplace electrode. In addition, the dimensions of the isolator correspond to the dimensions of the outer end of the protrusion and the diameter of the electrode mounting hole, thus ensuring that the two electrodes contact only the brine retainers of the inner and outer rings, respectively, improving the reliability of the electrode device while maintaining ease of assembly and maintenance.

[0076] Furthermore, both the first and second electrodes are silver / silver chloride electrodes, which have good conductivity and stability. The first electrode can be formed by coating the outer peripheral surface of the protrusion of the electrode holder with a corresponding slurry and then curing it, or by using an existing prefabricated annular electrode, which has fewer limitations in the production of such electrode devices.

[0077] Furthermore, the electrode device also includes active components, which may include the differential amplifier circuit required for the Laplace electrode to extract the potential difference between the two electrodes and suppress common-mode interference, thereby making the electrode device more convenient to use and producing a better quality output acquisition signal.

[0078] Furthermore, the electrode holder has device receiving grooves and lead receiving grooves that match the active device and its leads. The active device and leads are respectively housed in these grooves and sealed with waterproof glue. End caps are also provided to shield them. Therefore, the active device, leads and their connection parts can be well protected, preventing these charged components from being affected by the high humidity and high salinity environment of salt water. This ensures that the active device can work stably in the salt water environment for a long time, and also makes the overall appearance of the electrode device more aesthetically pleasing.

[0079] Furthermore, the second electrode passes through the through hole on the active device and is fixed and electrically connected to the active device by welding. The device receiving groove has a high degree of compatibility with the active device, and the active device can be fitted into it. Therefore, the cooperation between the active device and the device receiving groove can also play a positioning role for the second electrode, so that it can be kept in the middle of the electrode mounting hole, without contacting the hole wall, and maintaining a good relative position with the first electrode.

[0080] Furthermore, the second electrode can be securely fixed in the electrode assembly hole using an electrode fixing component, thereby further improving the reliability of the electrode device. The electrode fixing component can be a drum spring with a waterproof coating. The second electrode, fitted with the drum spring, can be directly inserted into the electrode assembly hole to achieve fixation, which is very convenient to use.

[0081] Furthermore, the outer end of the protrusion of the electrode holder has multiple barbs. Therefore, after the outer ring retainer (outer ring cylindrical sponge) fully absorbs the salt water, the multiple barbs will be embedded in one end of the outer ring retainer, which will play a fixing and limiting role, making the sponge less likely to fall off and able to remain stable during use.

[0082] Furthermore, since the diameter of the end of the protrusion near the disc is smaller, forming an annular groove, and the diameter of the mounting hole at one end of the support limiting part (suction cup) is slightly smaller than the outer diameter of the protrusion at the annular groove, the support limiting part can be interference-fitted onto the protrusion, and its movement is limited by the disc and the protrusion, especially the movement toward the direction of separation from the seat. After the sponge fully absorbs water, it will be tightly embedded in the inner cavity of the support limiting part. Therefore, even if the protrusion is not provided with barbs, the suction cup and the sponge are not easy to fall off during use, and the structure of the seat can be further simplified.

[0083] Furthermore, when the protrusion of the electrode holder does not have barbs, the outer end of the protrusion is cylindrical, and the first electrode can be a prefabricated annular electrode that can be directly fitted onto the protrusion, making the production of the electrode device more convenient.

[0084] In this embodiment, the electrode device employs an elastic fixing part to secure multiple electrode devices to the subject's body surface. The elastic fixing part includes multiple annular sheet-like portions and multiple strip-like sheet-like portions, and is made of a human-friendly material. Therefore, it not only provides greater comfort for the subject and prevents allergic reactions, but also minimizes surface coverage, offering ample operational space. This allows for easy assembly, disassembly, and adjustment of each electrode device during use, providing greater flexibility. When assembling the electrode devices on the elastic fixing part, simply pass one end of the pre-assembled device body through a mounting hole, attach the support and limiting part to the other end, and then insert the pre-assembled saline retention assembly into the inner cavity of the support and limiting part. The user can complete the assembly and disassembly by hand without special tools, making it extremely convenient to use.

[0085] Furthermore, after a subject has finished using the device, the sponge or sponge and suction cup can be removed and discarded, and a new sponge or sponge and suction cup can be replaced to reuse the electrode device for the next subject. The cost of the discarded part is very low, while the relatively expensive parts such as the elastic fixing part, electrode base, two electrodes, and active device can be retained and reused multiple times. Therefore, while avoiding cross-infection, the cost of use can be greatly reduced, which is also conducive to the large-scale promotion and application of the electrode device and related equipment.

[0086] The above embodiments are merely illustrative of specific implementations of this utility model, and the utility model is not limited to the scope of the above embodiments. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are only for illustrating the principles of the utility model. Various changes and modifications can be made to the utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as claimed. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A saline Laplace electrode device, characterized in that, include: Electrode holder; The first electrode and the second electrode are respectively disposed in the electrode holder; A supporting and limiting member is connected to the electrode seat and has a receiving cavity; as well as A brine retaining assembly, disposed within the receiving cavity, is used to absorb and retain brine. The brine retention assembly includes: The outer ring retainer is in the shape of a hollow cylinder, with one end in contact with the first electrode; The inner ring retainer, nested inside the outer ring retainer, is cylindrical, with one end in contact with the second electrode; and The spacer, in the form of a hollow cylinder, is disposed between the nested outer ring retainer and the inner ring retainer to isolate them. The outer ring retainer, the isolator, and the inner ring retainer are coaxial, forming multiple concentric circle structures to form a Laplace electrode.

2. The saline Laplace electrode device according to claim 1, characterized in that: in, The outer ring retainer and the inner ring retainer expand uniformly after absorbing salt water. The receiving cavity is a cylindrical cavity with a uniform inner diameter, used to support and limit the outer ring retainer.

3. The saline Laplace electrode device according to claim 2, characterized in that: in, The outer diameter of the outer ring retainer is 8mm to 20mm, and the inner diameter is correspondingly 5mm to 19mm. The diameter of the inner ring retainer is 1mm to 5mm. The insulating element is made of an insulating and waterproof material, or has an insulating and waterproof coating.

4. The saline Laplace electrode device according to claim 3, characterized in that: in, Both the outer ring retainer and the inner ring retainer are made of sponge. The isolation component is a plastic cylindrical component.

5. The saline Laplace electrode device according to claim 1, characterized in that: in, The electrode holder includes a disk portion and a protrusion extending from the center of one surface of the disk portion, the protrusion having a cylindrical portion. The electrode holder has a through electrode assembly hole in the middle. The first electrode is an annular electrode, disposed on the outer periphery of the cylindrical portion. The second electrode is a long strip electrode, which is disposed in the electrode assembly hole.

6. The brine Laplace electrode device according to claim 5, characterized in that, Also includes: An active device, electrically connected to both the first and second electrodes, has a through-hole in its middle. The disk portion has a device receiving groove on its other surface, which communicates with the electrode mounting hole, and the active device is housed in the device receiving groove. One end of the second electrode passes through the through hole and is fixed to the active device.

7. The brine Laplace electrode device according to claim 6, characterized in that, Also includes: End cap, which matches the disc portion. The disk portion also has a lead receiving groove on another surface that communicates with the device receiving groove, and the lead wire connected to the active device is accommodated in the lead receiving groove. The device receiving groove and the lead receiving groove are provided with sealing parts to waterproof and seal the active device and the connection between the active device and the lead. The end cap is disposed on the disk portion and is used to cover the device receiving slot and the lead receiving slot.

8. The brine Laplace electrode device according to claim 5, characterized in that: in, The end of the protrusion that connects to the disk portion has an outer annular groove. One side wall of the outer annular groove is a limiting surface facing the disk portion. One end of the support and limiting member has an assembly hole, and this end of the support and limiting member is interference-fitted into the outer ring groove through the assembly hole. One surface of the disc portion and the limiting surface are used to limit the support limiting member.

9. The saline Laplace electrode device according to claim 1, characterized in that: in, Both the first electrode and the second electrode are signal acquisition electrodes, which are silver / silver chloride electrodes.

10. A brine electrode device, characterized in that, include: One or more electrode devices for acquiring signals from a subject; as well as An elastic fixing part is used to fix the electrode device to the subject's body surface. Wherein, one or more of the electrode devices are saline Laplace electrode devices as described in any one of claims 1-9.

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