Rigidity-adjustable electroencephalogram comb-shaped dry electrode based on hybrid connection double-spring system

Abstract

The invention relates to the technical field of medical instruments, and discloses a rigidity-adjustable electroencephalogram comb-shaped dry electrode based on a hybrid connection double-spring system, which comprises a spring rotating device, the top end of the spring rotating device is fixedly connected with an electroencephalogram cap pressing contact point, and the top surface of the electroencephalogram cap pressing contact point forms an electroencephalogram cap pressing contact surface; the spring rotating device comprises a spring I; the top ends of the plurality of comb-shaped electrode claws are fixedly connected with the spring rotating device; each comb-shaped electrode claw comprises an electrode claw insulation shell, an electrode core contained in the electrode claw insulation shell and a second spring arranged above the electrode core. By means of the mixed connection double-spring system formed by connecting the first spring and the second springs connected in parallel in series, the overall rigidity can be adjusted, and the problem that low-noise signal collection and high operation stability are difficult to achieve at the same time due to the fact that an existing electroencephalogram comb-shaped dry electrode cannot maintain high anti-interference rigidity under low contact pressure is solved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system. Background Technology

[0002] Electroencephalogram (EEG) electrodes are mainly divided into two categories: wet electrodes and dry electrodes. Dry electrodes, in particular, have attracted much attention due to their elimination of the need for conductive gel and shorter preparation time. Comb-shaped dry electrodes, a common type, use multiple conductive teeth to contact the scalp to reduce contact resistance. Existing technologies primarily focus on optimizing the mechanical structure of the electrodes, such as using rigid materials to ensure hair penetration or employing flexible materials and simple elastic structures to improve wearing comfort. However, these solutions have inherent limitations when dealing with dynamic usage scenarios.

[0003] The mechanical structure design of existing EEG comb-shaped dry electrodes is usually relatively simple, and their system stiffness is often fixed within a narrow range. As a result, electrodes with low stiffness are prone to displacement due to insufficient anti-interference ability when the user moves, leading to signal instability. Electrodes with high stiffness are prone to introducing significant contact noise due to excessive or uneven local pressure, which may cause discomfort to the user. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system, which solves the problem that existing EEG comb-shaped dry electrodes cannot simultaneously guarantee low contact noise and high anti-interference stiffness due to their fixed stiffness.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system, comprising:

[0006] A spring rotating device, wherein a pressing contact point for an EEG cap is fixedly connected to the top of the spring rotating device, and the top surface of the pressing contact point for the EEG cap constitutes the pressing contact surface of the EEG cap; the spring rotating device includes a spring.

[0007] Multiple comb-shaped electrode claws, the top ends of which are fixedly connected to a spring rotating device; each of the multiple comb-shaped electrode claws includes an electrode claw insulating shell, an electrode core housed within the electrode claw insulating shell, and a second spring disposed above the electrode core, the top end of the second spring being connected to the inner top wall of the electrode claw insulating shell, and the bottom end of the second spring being connected to the upper surface of the electrode core.

[0008] An electrode interface is located on the top of the spring rotating device.

[0009] By adopting the above technical solution, multiple springs II can work independently within their respective electrode claws, forming a parallel subsystem. This provides localized low stiffness, ensuring that each electrode core can adapt to micro-deformations of the scalp, apply gentle and uniform pressure, reduce contact noise, and improve comfort. The whole system is also connected in series with spring I to form a hybrid dual-spring system. When it is necessary to resist macroscopic motion interference, spring I provides and sets a higher dominant stiffness to ensure the overall stability of the electrode array. This solves the problem that it is impossible to balance low contact noise and high anti-interference stiffness due to fixed stiffness.

[0010] Preferably, the spring rotating device further includes:

[0011] A spring-rotating shaft is fixedly connected at its top end to the pressing contact point of the EEG cap; a spring is located on the surface of the spring-rotating shaft; a pin is fixedly provided on the side of the spring-rotating shaft.

[0012] A rotary pin slide rail surrounds the outside of the spring rotation shaft, and a continuous track is provided inside the rotary pin slide rail, with the pin slidably connected inside the track.

[0013] The lower surface of the spring rotating device is sleeved on the outer side of the spring rotating shaft. The pin passes through the mating hole provided on the lower surface of the spring rotating device and is located inside the mating hole. The lower surface of the spring rotating device is fixedly connected to the top of the comb-shaped electrode claw.

[0014] Preferably, the track inside the rotary pin slide includes, from top to bottom, a rotating inclined section, a vertical section and a rotary section, wherein the rotating inclined section and the rotary section are inclined tracks and the vertical section is a vertical track.

[0015] Preferably, the electrode interface is an electrode clip, which is fixedly connected to one end of the wire, and the other end of the wire is fixedly connected to the electrode core.

[0016] Preferably, the springs two in the multiple comb-shaped electrode claws are arranged in parallel with each other, and the multiple springs two in parallel are connected in series with the spring one in the spring rotating device.

[0017] Preferably, the bottom of the insulating shell of the electrode claw is provided with multiple holes, through which multiple electrode cores extend.

[0018] Preferably, the plurality of the comb-shaped electrode claws are arranged in a ring around the axis of the spring rotation shaft.

[0019] A preferred method for using stiffness-adjustable EEG comb-shaped dry electrodes based on a hybrid-connected dual-spring system includes the following steps:

[0020] Apply pressure to the contact point of the EEG cap to drive the spring rotation device to move along its axis;

[0021] Driven by pressure, the spring rotating device drives multiple comb-shaped electrode claws to rotate, causing the front end of each electrode core to rotate under the hair and contact the scalp.

[0022] Independent elastic contact pressure is applied to each corresponding electrode core by spring two, and overall pressure compensation is achieved by a series system consisting of spring one and multiple parallel spring twos. While maintaining stable contact between the electrode core and the scalp, EEG signals are collected through the electrode interface.

[0023] Preferably, the movement of the spring rotating device includes:

[0024] The spring-rotating device rotates under pressure, which in turn drives the comb-shaped electrode claws to rotate.

[0025] After the rotation reaches the predetermined position, the movement of the spring rotation device is restricted to vertical displacement only along its axis to compensate for the inertial offset caused by the movement.

[0026] Preferably, the method further includes a reset step:

[0027] When the pressure applied to the EEG cap's contact points is released, the spring rotation device moves in the opposite direction under the action of the hybrid dual-spring system, causing the comb-shaped electrode claws to rotate away from the scalp and return to their initial position.

[0028] This invention provides a stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid-connected dual-spring system. It offers the following advantages:

[0029] 1. This invention achieves adjustable overall stiffness by employing a hybrid connection dual-spring system consisting of spring one and multiple parallel spring two connected in series. This solves the problem that existing EEG comb-shaped dry electrodes cannot maintain high anti-interference stiffness under low contact pressure, thus making it difficult to balance low-noise signal acquisition and high operational stability.

[0030] 2. By fully internalizing the stiffness adjustment function into the mechanical structure of the electrode body, this invention achieves continuous action and adaptive stiffness adjustment that can be triggered by a single press, including rotational cutting, axial compliance and automatic reset. This solves the problems of complex assembly, redundant structure, cumbersome operation and difficulty in integration caused by the reliance on external auxiliary adjustment devices in traditional solutions.

[0031] 3. This invention achieves real-time and compliant following of the dynamic physiological deformation of the scalp by constructing a two-level adaptive mechanism, in which an independent spring is responsible for local micro-deformation compensation and a series spring system is responsible for overall macro-displacement buffering. This solves the problems of signal baseline drift, increased low-frequency noise and insufficient long-term monitoring stability caused by time-varying contact interface impedance. Attached Figure Description

[0032] Figure 1 This is a three-dimensional view of the stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to the present invention.

[0033] Figure 2 This is a schematic diagram of the comb-shaped electrode claw of the EEG comb-shaped dry electrode based on the hybrid connection dual-spring system of the present invention.

[0034] Figure 3 This is a schematic diagram of the spring rotation device for the stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to the present invention.

[0035] Figure 4 This is a flowchart illustrating the method of using the stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to the present invention.

[0036] The components include: 1. Electrode interface; 2. EEG cap pressing contact point; 3. Spring rotation device; 4. Comb-shaped electrode claw; 5. Electrode claw insulating shell; 6. Electrode core; 7. Spring 2; 8. Spring rotation shaft; 9. Pin; 10. EEG cap pressing contact surface; 11. Spring 1; 12. Rotating pin slide; 13. Lower surface of spring rotation device. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] Please see the appendix Figure 1 -Appendix Figure 3 This invention provides stiffness-adjustable EEG comb-shaped dry electrodes based on a hybrid-connected dual-spring system, comprising:

[0039] The spring rotating device 3 has a fixed connection at its top end to the EEG cap pressing contact point 2. The top surface of the EEG cap pressing contact point 2 forms the EEG cap pressing contact surface 10. The spring rotating device 3 includes a spring 11.

[0040] Multiple comb-shaped electrode claws 4, the top ends of which are fixedly connected to the spring rotating device 3; each of the multiple comb-shaped electrode claws 4 includes an electrode claw insulating shell 5, an electrode core 6 housed in the electrode claw insulating shell 5, and a second spring 7 disposed above the electrode core 6, the top end of the second spring 7 being connected to the inner top wall of the electrode claw insulating shell 5, and the bottom end of the second spring 7 being connected to the upper surface of the electrode core 6.

[0041] Electrode interface 1 is located on the top of the spring rotating device 3.

[0042] Specifically, the EEG cap pressing contact point 2 and its top surface together form the EEG cap pressing contact surface 10, which serves as the mechanical interface between the device and the external EEG cap or the operator's fingers. It is used to receive and gather the externally applied pressing force, which is used as a concentrated initial input load and transmitted to the top of the spring rotating device 3. The spring rotating device 3 transmits and initially buffers the received axial pressing force. The spring 11 contained inside is the primary elastic element of the device, providing a basic compressibility and macroscopic stiffness for the entire system, in order to balance the external pressing force and store potential energy.

[0043] Multiple comb-shaped electrode claws 4 serve as signal acquisition terminals that ultimately come into contact with the human scalp, and their tops are all fixedly connected to the spring rotating device 3; the axial movement and possible compound movement of the spring rotating device 3 will synchronously drive all the comb-shaped electrode claws 4 to ensure the consistency of movement of each electrode contact.

[0044] Each comb-shaped electrode claw 4 constitutes an independent contact module; the electrode claw insulating shell 5 electrically isolates the internal conductive components from the outside world, ensuring safety and the uniqueness of signal acquisition; the electrode core 6 inside the electrode claw insulating shell 5 contacts the scalp surface to pick up weak EEG signals; the spring 7 located above the electrode core 6 is used to apply a pre-tensioning force pointing towards the scalp on the electrode core 6; the function of each spring 7 is to independently and elastically maintain the close contact between its corresponding electrode core 6 and the irregular scalp surface, and adaptively compensate for the deformation of the local contact point caused by vascular pulsation, etc.

[0045] Electrode interface 1 is located on the top of spring rotating device 3 and is electrically connected to each electrode core 6. It serves as the physical collection point and external output port for all collected EEG signals, guiding the simulated bioelectric signals to the subsequent amplification and processing circuit.

[0046] See appendix Figure 1 -Appendix Figure 3 The spring rotating device 3 also includes:

[0047] A spring rotating shaft 8 is fixedly connected at its top end to the EEG cap pressing contact point 2; a spring 11 is located on the surface of the spring rotating shaft 8; a pin 9 is fixedly provided on the side of the spring rotating shaft 8.

[0048] The rotary pin slide 12 surrounds the outside of the spring rotation shaft 8. The rotary pin slide 12 has a continuous track inside, and the pin 9 is slidably connected inside the track.

[0049] The lower surface 13 of the spring rotating device is sleeved on the outer side of the spring rotating shaft 8. The pin 9 passes through the mating hole provided on the lower surface 13 of the spring rotating device. The pin 9 is located inside the mating hole. The lower surface of the lower surface 13 of the spring rotating device is fixedly connected to the top of the comb-shaped electrode claw 4.

[0050] Specifically, when the pressing force drives the spring rotating shaft 8 to move downward axially, the pin 9 moves downward synchronously. Since the pin 9 is constrained by the preset track shape in the rotary pin slide 12, its downward path is not a simple straight line, but is forced to slide along the track contour. For example, when the initial section of the track is a rotating inclined section, the downward movement of the pin 9 will simultaneously generate a tangential component motion. This component motion pushes the lower surface 13 of the spring rotating device through the pin 9 passing through the mating hole, causing it to rotate around the axis. The rotation of the lower surface 13 of the spring rotating device then drives all the comb-shaped electrode claws 4 to rotate synchronously. This realizes the mechanism of converting vertical pressing into the rotational motion of the electrode claws. Its application purpose is to enable the tip of the electrode claws to rotate under the hair and reach the scalp surface.

[0051] When pin 9 slides into the subsequent vertical section of the track, its movement is constrained to a purely axial movement. At this time, the rotational freedom of the lower surface 13 of the spring rotating device is locked, and the entire device can only perform axial vertical displacement with the spring rotating shaft 8. The significance of this stage is that after the electrode claws have contacted the scalp, the device can use the axial elasticity of spring 11 and the entire system to absorb the inertial interference caused by the user's slight movements such as breathing and micro-movements, so that the electrode core 6 remains dynamically stationary relative to the scalp, thereby improving contact stability. When the pressing pressure is removed, under the action of the restoring force of spring 11, the spring rotating shaft 8 moves upward, and pin 9 slides in the opposite direction along the track, ultimately driving the lower surface 13 of the spring rotating device and the comb-shaped electrode claws 4 to reverse and reset, detaching from the scalp.

[0052] See appendix Figure 1 -Appendix Figure 3 The track inside the rotary pin slide 12 includes, from top to bottom, a rotating inclined section, a vertical section and a rotary section. The rotating inclined section and the rotary section are inclined tracks, and the vertical section is a vertical track.

[0053] Specifically, the rotating inclined section is located at the top of the track. When the pin 9, fixed to the spring rotating shaft 8, first enters this section under external pressure, the inclined structure applies a normal constraint force to the pin 9, which can be decomposed into an axial component and a tangential component. The tangential component forces the pin 9 to generate a circumferential motion tendency while displacing axially. Since the pin 9 passes through the mating hole of the lower surface 13 of the spring rotating device, this circumferential tendency is converted into a rotational driving torque on the lower surface 13 of the spring rotating device through the interaction of the hole walls, thereby driving the lower surface 13 of the spring rotating device and the entire comb-shaped electrode claw 4 assembly connected thereto to rotate around the axis. This is used to convert the initial vertical pressure applied by the user or EEG cap into the rotational cutting action of the comb-shaped electrode claw 4, enabling it to overcome the resistance of the hair and deliver the front end of the electrode core 6 to the scalp surface.

[0054] The vertical section connects to the rotating inclined section; it is a vertical track. In this section, the constraint force of the track wall on the pin 9 exists only in the radial direction, and there is no constraint component in the tangential direction, i.e., the rotational direction. When the pin 9 slides from the rotating inclined section into this vertical section under continuous pressure, the rotational motion of the lower surface 13 of the spring rotating device loses the forced drive from the track, and its rotational degree of freedom is locked. At this time, the motion of the entire device is simplified to a pure linear displacement along the axis of the spring rotation axis 8. The realization of this stage depends on the fact that the electrode positioning has been completed by the previous rotational action, and its application logic is changed to contact holding and dynamic compensation. With the elastic support of the spring 11 and the entire double spring system, the device can float up and down within the stroke of this vertical section, thereby absorbing the inertial force caused by the slight shaking of the head or the movement of the body, so that the electrode core 6 and the scalp maintain a dynamically stable contact state.

[0055] The swivel section is located at the bottom of the track or forms the return path; it is also an inclined track, but the inclination direction is related to the rotating inclined section at the top, usually forming a path that guides upward and reverse rotation; when the external pressing pressure is removed, the elastic potential energy stored in spring 11 is released, driving the spring rotation shaft 8 to return to its original position; at this time, the pin 9 moves along the track, and under the guidance of the inclined wall of the swivel section, it generates a tangential motion component in the opposite direction to the downward pressing; this component drives the lower surface 13 of the spring rotation device to rotate in the opposite direction through the mating hole, thereby driving the comb-shaped electrode claw 4 to rotate away from the scalp and return to the initial retracted position; the setting of this section ensures the integrity and repeatability of the device's working cycle.

[0056] See appendix Figure 1 -Appendix Figure 3 Electrode interface 1 is an electrode clip, which is fixedly connected to one end of the wire, and the other end of the wire is fixedly connected to the electrode core 6.

[0057] Specifically, when the electrode core 6 contacts the scalp and picks up the simulated EEG signal, the signal first enters the conduction pathway through the fixed connection point between the wire and the electrode core 6. Subsequently, the signal is transmitted along the wire. The wire itself needs to have a certain degree of flexibility to adapt to the deformation during the pressing and resetting process of the device, but its shielding structure and the selection of the core wire material must be aimed at ensuring signal integrity. The signal finally arrives and is output through the electrode interface 1 in the form of an electrode clip. In this process, the electrode clip, as a reliable interface, completes the transition of the signal from the motion electrode device to the static external cable.

[0058] See appendix Figure 1 -Appendix Figure 3 The springs 7 inside the multiple comb-shaped electrode claws 4 are connected in parallel, and the multiple springs 7 connected in parallel are connected in series with the spring 11 inside the spring rotating device 3.

[0059] Specifically, when the device is pressed against the head, spring 11 is first compressed, and its stiffness determines the overall pressing reaction force felt by the user and the device's ability to resist macroscopic motion interference. Subsequently, through series force transmission, each independent spring 7 independently completes the final contact and microscopic tracking of its electrode core 6 with the scalp surface within a shared preset pressure range. The global stability requirement and the local adaptability requirement are decoupled, and through a composite connection relationship of series and parallel, the two are organically integrated into a unified mechanical system.

[0060] See appendix Figure 1 -Appendix Figure 3 The bottom of the electrode claw insulating shell 5 has multiple holes, through which multiple electrode cores 6 extend.

[0061] Specifically, when the entire comb-shaped electrode claw 4 rotates and presses down under the drive of the spring rotating device 3, the front end of the electrode core 6 protruding from the hole first contacts the scalp; as the pressing continues, the reaction force of the scalp forces the electrode core 6 to overcome the force of the spring 7, and generate an upward relative displacement relative to the electrode claw insulating shell 5; during this process, the inner wall of the hole always guides the electrode core 6 to maintain vertical movement and prevents it from tilting laterally or interfering with the internal structure of the shell; at the application level, the contradiction between protection and contact is resolved; the electrode claw insulating shell 5 protects the rod part of the electrode core 6 and the internal connecting wires, avoiding accidental short circuits with hair or skin, while the bottom hole reliably exposes the effective contact point of the electrode core 6, ensuring the stability of signal acquisition; the edges of the hole are usually rounded to avoid scratching the scalp.

[0062] See appendix Figure 1 -Appendix Figure 3 Multiple comb-shaped electrode claws 4 are arranged in a ring around the axis of the spring rotation shaft 8.

[0063] Specifically, the circular arrangement of multiple contact points simulates the distribution pattern of fingertips when pressing, adapts to the curvature of the head surface, and expands the effective contact area of ​​a single press. When the device is pressed on the scalp, the multiple electrode cores 6 distributed in a ring can cover a circular scalp area, which helps to obtain more spatially representative EEG signals from a small area, and due to its symmetrical distribution, it has better mechanical tolerance to micro-movement interference from different directions of the head.

[0064] See appendix Figure 4 The method for using stiffness-adjustable EEG comb-shaped dry electrodes based on a hybrid connection dual-spring system includes the following steps:

[0065] Apply pressure to the contact point 2 of the EEG cap to drive the spring rotation device 3 to move along its axis;

[0066] Driven by the pressure, the spring rotating device 3 drives multiple comb-shaped electrode claws 4 to rotate, so that the front end of each electrode core 6 rotates to the underside of the hair and contacts the scalp.

[0067] Furthermore, the movement of the spring rotating device 3 includes:

[0068] The spring rotating device 3 rotates under pressure, which in turn drives the comb-shaped electrode claw 4 to rotate.

[0069] After the rotation reaches the predetermined position, the movement of the spring rotating device 3 is restricted to vertical displacement only along its axis to compensate for the inertial offset caused by the movement.

[0070] Independent elastic contact pressure is applied to the corresponding electrode cores 6 by spring 2 7, and overall pressure compensation is achieved by a series system consisting of spring 1 11 and multiple parallel springs 2 7. While maintaining stable contact between the electrode cores 6 and the scalp, EEG signals are collected through electrode interface 1.

[0071] Furthermore, the method also includes a reset step:

[0072] When the pressure applied to the EEG cap's contact point 2 is released, the spring rotation device 3 moves in the opposite direction under the action of the hybrid double spring system, causing the comb-shaped electrode claw 4 to rotate away from the scalp and return to its initial position.

[0073] Specifically, by applying a pressing force along the main axis of the device to the pressing contact point 2 of the EEG cap using the user's finger, the spring rotation device 3 connected to the pressing point is driven to produce a linear motion along its axis, i.e., the axis of the spring rotation axis 8.

[0074] Under continuous pressing pressure, the spring rotating device 3 enters the compound motion stage. Specifically, since the starting section of the track of the rotary pin slide 12 is a rotating inclined section, when the pin 9 slides along this inclined section, the constraint reaction force exerted by the track wall on the pin 9 will generate a tangential component force. This component force is transformed into a torque that drives the lower surface 13 of the spring rotating device to rotate around the axis through the interaction between the pin 9 and the mating hole on the lower surface 13 of the spring rotating device. Thus, the spring rotating device 3 superimposes rotational motion on the basis of axial linear motion, and then drives all the comb-shaped electrode claws 4 fixedly connected to it to rotate synchronously. The operation of this step automatically converts linear pressing into rotational action through mechanical cooperation. Its application purpose is to enable the electrode core 6 at the front end of each comb-shaped electrode claw 4 to part the hair in a rotating manner and cut into the scalp surface at the hair root, thereby overcoming the physical obstruction caused by the hair to directly and vertically place the dry electrode.

[0075] When the rotational motion reaches the predetermined position, i.e., when the pin 9 slides into the vertical section of the track, the motion mode of the spring rotation device 3 changes; at this time, the track only constrains the pin 9 axially, and the movement of the device is restricted to vertical displacement along the axial direction only; providing axial compliance depends on the axial elasticity of the spring 11 and the entire double spring system; when the user's head makes slight movements such as breathing, swallowing or micro-movement, the relative displacement between the scalp and the electrode is transmitted to the spring system through the electrode core 6. The system absorbs this displacement through axial elastic deformation, thereby mechanically compensating for inertial offset and maintaining dynamic stable contact between the electrode core 6 and the scalp;

[0076] Throughout the entire process of contact between the electrode core 6 and the scalp, the establishment and maintenance of contact pressure are accomplished collaboratively by a hybrid dual-spring system. Specifically, each comb-shaped electrode claw 4 has a second spring 7 working independently, applying an independent elastic contact pressure to its corresponding electrode core 6, the magnitude of which is determined by the stiffness and compression of the second spring 7 itself. Multiple second springs 7 work in parallel, jointly providing rapid adaptive capability to local deformation of the scalp. At the same time, all the parallel second springs 7 form a whole, forming a series relationship with the first spring 11 in the spring rotation device 3. Overall pressure compensation and stiffness regulation are performed, so that the local contact pressure is adaptively distributed within the parallel group of second springs 7, while the overall contact pressure range is set and buffered by the first spring 11 through the series relationship.

[0077] While the contact pressure is maintained, EEG signals are acquired through electrode interface 1; the microvolt-level analog electrical signals picked up by electrode core 6 are transmitted to electrode interface 1 through internal wires, and then input to signal amplification and processing equipment through external cables to complete the application goal of signal acquisition.

[0078] When the signal acquisition is complete and the electrodes need to be removed, the pressure applied to the EEG cap's pressing contact point 2 is released. At this time, the elastic potential energy stored in the compressed spring 11 and part of the spring 7 is released, driving the spring rotation shaft 8 to move upward. The pin 9 slides in the opposite direction along the track's rotating section. The inclined surface of the rotating section guides the pin 9 to drive the lower surface 13 of the spring rotation device to rotate in the opposite direction, thereby causing all the comb-shaped electrode claws 4 to rotate away from the scalp surface and finally return to the initial retracted position. This step ensures that the device can be reused and avoids the discomfort or hair pulling that may be caused by directly pulling the electrodes vertically out of the scalp.

[0079] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system, characterized in that, include: A spring rotating device (3) is fixedly connected to the top of the spring rotating device (3) with an EEG cap pressing contact point (2). The top surface of the EEG cap pressing contact point (2) constitutes the EEG cap pressing contact surface (10). The spring rotating device (3) includes a spring (11). Multiple comb-shaped electrode claws (4), the top ends of the multiple comb-shaped electrode claws (4) are fixedly connected to the spring rotating device (3); the multiple comb-shaped electrode claws (4) each include an electrode claw insulating shell (5), an electrode core (6) housed in the electrode claw insulating shell (5) and a second spring (7) disposed above the electrode core (6), the top end of the second spring (7) is connected to the inner top wall of the electrode claw insulating shell (5), and the bottom end of the second spring (7) is connected to the upper surface of the electrode core (6); Electrode interface (1) is located on top of spring rotating device (3).

2. The stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to claim 1, characterized in that, The spring rotating device (3) further includes: A spring rotating shaft (8) is fixedly connected at its top end to the EEG cap pressing contact point (2); a spring (11) is located on the surface of the spring rotating shaft (8); a pin (9) is fixedly provided on the side of the spring rotating shaft (8). A rotary pin slide (12) surrounds the outside of the spring rotating shaft (8), and a continuous track is provided inside the rotary pin slide (12), and the pin (9) is slidably connected inside the track; The lower surface (13) of the spring rotating shaft (8) is sleeved on the outside. The pin (9) passes through the mating hole provided on the lower surface (13) of the spring rotating device. The pin (9) is located inside the mating hole. The lower surface of the lower surface (13) of the spring rotating device is fixedly connected to the top of the comb-shaped electrode claw (4).

3. The stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to claim 2, characterized in that: The track inside the rotary pin slide (12) includes, from top to bottom, a rotating inclined section, a vertical section and a rotary section. The rotating inclined section and the rotary section are inclined tracks, and the vertical section is a vertical track.

4. The stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to claim 1, characterized in that, The electrode interface (1) is an electrode buckle, which is fixedly connected to one end of the wire, and the other end of the wire is fixedly connected to the electrode core (6).

5. The stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to claim 1, characterized in that: The springs 2 (7) in the multiple comb-shaped electrode claws (4) are connected in parallel, and the multiple springs 2 (7) connected in parallel are connected in series with the spring 1 (11) in the spring rotating device (3).

6. The stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to claim 1, characterized in that: The bottom of the electrode claw insulating shell (5) has multiple holes, through which multiple electrode cores (6) extend.

7. The stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to claim 1, characterized in that: The multiple comb-shaped electrode claws (4) are arranged in a ring around the axis of the spring rotation shaft (8).

8. A method for using a stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system, characterized in that... The stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system as described in any one of claims 1-7 comprises the following steps: Apply pressure to the contact point (2) of the EEG cap to drive the spring rotation device (3) to move along its axis; Driven by the pressure, the spring rotating device (3) drives multiple comb-shaped electrode claws (4) to rotate, so that the front end of each electrode core (6) rotates to the underside of the hair and contacts the scalp; Independent elastic contact pressure is applied to the corresponding electrode core (6) by spring 2 (7), and overall pressure compensation is performed by a series system consisting of spring 1 (11) and multiple parallel spring 2 (7). While maintaining stable contact between the electrode core (6) and the scalp, EEG signals are collected through the electrode interface (1).

9. The method of using the stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to claim 8, characterized in that, The motion of the spring rotating device (3) includes: The spring rotating device (3) rotates under pressure, which in turn drives the comb-shaped electrode claw (4) to rotate; After the rotation reaches the predetermined position, the movement of the spring rotating device (3) is restricted to vertical displacement only along its axis to compensate for the inertial offset caused by the movement.

10. The method of using the stiffness-adjustable EEG comb-shaped dry electrode based on a hybrid connection dual-spring system according to claim 8, characterized in that, The method further includes a reset step: When the pressure applied to the EEG cap is released, the spring rotation device (3) moves in the opposite direction under the action of the hybrid double spring system, causing the comb-shaped electrode claw (4) to rotate away from the scalp and return to the initial position.

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