Woven electroencephalogram signal acquisition support and electroencephalogram signal acquisition system

Abstract

The invention relates to the technical field of medical instruments, in particular to a woven type electroencephalogram signal collecting support which comprises a support body. The electrodes are distributed on the surface of the support body, the surfaces of the electrodes are coated with insulating layers, and signal acquisition ends are exposed; one end of the wire is connected with the electrode, and the other end converges to form a physical interface. The brain-computer interface braided stent implanted into the brain in a vascular intervention mode is used for solving the problems that in the prior art, a brain-computer interface electrode device is large in implantation trauma, the contact stability of an electrode and brain tissue is low, and the signal collection coverage range is limited.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a braided electroencephalogram (EEG) signal acquisition bracket and an EEG signal acquisition system. Background Art

[0002] Brain-Computer Interface (BCI) technology aims to establish a direct communication path between the brain and external devices, enabling device control or information exchange by collecting and analyzing EEG signals generated by neural activity. During EEG signal acquisition, the stability of contact between electrodes and brain tissue, signal acquisition accuracy, and the invasiveness of the implantation method are key factors affecting the performance of BCI systems.

[0003] Existing invasive BCI electrode devices typically require craniotomy and other procedures to implant into the cerebral cortex. This approach significantly damages brain tissue, carries high surgical risks, and can lead to complications such as postoperative infection. While non-invasive BCIs avoid surgical risks, they suffer from lower signal acquisition accuracy and cannot meet the requirements of some high-precision BCI applications.

[0004] Vascular interventional brain-computer interface technology, as an emerging implantation method, delivers electrodes to specific brain regions (such as the superior sagittal sinus) via blood vessels, offering advantages such as minimal trauma and low risk. As one of the main venous pathways within the brain, the superior sagittal sinus has important physiological functions. Furthermore, its proximity to important functional areas of the brain, such as the motor cortex, facilitates the acquisition of movement-related EEG signals.

[0005] The current vascular interventional brain-computer interface electrode device still needs to be further improved in terms of the contact stability between the electrode and the blood vessel wall, the signal acquisition coverage, and the reliability of long-term implantation. Summary of the Invention

[0006] The purpose of the present invention is to provide a brain-computer interface woven stent that is implanted in the brain through vascular intervention to solve the problems in the prior art of large implantation trauma of brain-computer interface electrode devices, low contact stability between electrodes and brain tissue, and limited signal acquisition coverage.

[0007] To achieve the above-mentioned purpose, as a first aspect, the present invention provides the following technical solution: a braided EEG signal acquisition bracket, comprising:

[0008] Bracket body: mesh elastic structure;

[0009] Electrode: distributed on the surface of the stent body, with an insulating layer coated on the electrode surface and the signal collection end exposed;

[0010] Wire: One end is connected to the electrode, and the other end is converged to form a physical interface.

[0011] According to the present invention, further, the stent body has shape memory properties, and is implanted into a blood vessel via a catheter in a compressed state, and expands to fit the inner wall of the blood vessel after being released.

[0012] According to the present invention, further, the stent body is woven into a mesh structure by a plurality of braided wires.

[0013] According to the present invention, further, the braided wire is composed of a platinum inner layer, an isolation layer and a nickel-titanium alloy outer layer from the inside to the outside; the platinum inner layer extends to both ends of the braided wire for intravascular positioning under X-ray.

[0014] According to the present invention, further, the number of braided wire strands is 8-16, the wire diameter is 0.05-0.1 mm, and the braiding angle is 45°-60°.

[0015] According to the present invention, further, the distribution density of the electrodes is adjusted based on the functional distribution of the target brain area, and the electrode density of the vascular branches corresponding to the motor cortex or visual cortex is higher than that of other areas.

[0016] According to the present invention, further, the electrode is a semi-cylindrical platinum electrode with a maximum diameter of 0.05 to 0.1 mm, and is spirally distributed on the surface of the stent body.

[0017] According to the present invention, further, the isolation layer is made of parylene or polyurethane material.

[0018] According to the present invention, further, the inner layer of the wire is platinum and the outer layer is an insulated wire of parylene or polyurethane.

[0019] As another aspect of the present invention, the present invention further provides an EEG signal acquisition system, comprising the above-mentioned bracket, wherein an external signal acquisition device is connected to the wire via a physical interface.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The vascular interventional brain-computer interface stent adopts a woven structure design with good elasticity and flexibility. It can fit closely to the inner wall of the blood vessel, reduce damage to the blood vessels and blood flow interference, and improve the safety and comfort of implantation.

[0022] 2. The electrodes are spirally distributed on the braided wire of the stent, and the density can be flexibly adjusted according to the functional distribution of brain regions, realizing multi-channel signal acquisition from different areas of the brain, meeting the needs of the brain-computer interface system for analyzing complex brain neural activities.

[0023] 3. The whole body developability of the stent ensures the precise positioning of the stent in the blood vessel, improves the accuracy of electrode implantation, and further improves the reliability of signal acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an overall schematic diagram of a braided EEG signal acquisition bracket of the present invention;

[0025] Figure 2 for Figure 1 A magnified explosion diagram;

[0026] Figure 3 for Figure 2 Explosion diagram of

[0027] Figure 4 Schematic diagram of the decomposition of electrodes and braided wires.

[0028] 1-wire, 2-stent, 2-1-braided wire, 2-1-1-nickel-titanium alloy outer layer, 2-1-2-inner platinum inner layer, 2-1-3-isolating layer, 3-electrode, 3-1-insulating layer.

[0029] In the picture: DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] like Figure 1 FIG. 1 is a schematic diagram of a braided EEG signal acquisition bracket, which is composed of three parts: a wire 1, a bracket 2, and an electrode 3.

[0032] Wire 1 corresponds one-to-one with electrode 3, with one end connected to electrode 3 and the other end converging to one end of stent 2, forming a signal output interface for connection to external signal acquisition equipment. Wire 1 is made of a flexible and highly resistant conductive material, capable of adapting to the deformation of stent 2 within the blood vessel, avoiding breakage or interference with signal transmission due to blood flow and vascular pulsation. The outer layer of wire 1 is made of polyparaxylene or polyurethane, which acts as an insulator. The inner layer of wire 1 is made of platinum, a material with excellent electrical conductivity.

[0033] Figure 2-Figure 4 for Figure 1Enlarged schematic diagram of center area A. Stent 2 is woven from multiple braided wires 2-1, forming a mesh structure that conforms to the inner wall of a blood vessel. The wire diameter of the braided wires 2-1 ranges from 0.05 to 0.1 mm, with 8 to 16 strands and a braid angle of 45° to 60°. Braided wire 2-1 comprises a nickel-titanium alloy outer layer 2-1-1, a platinum inner layer 2-1-2, and an isolation layer 2-1-3 positioned between the two to reduce electrical impedance and prevent short circuits. The isolation layer 2-1-3 can be made of parylene or polyurethane. The platinum 2-1-2 and the intermediate layer 2-1-3 extend through the opposing end surfaces of the nickel-titanium alloy 2-1-1. Platinum 2-1-2 exhibits excellent X-ray visualization, allowing precise positioning of the stent within the blood vessel, ensuring accurate implantation of the electrodes 3 into the corresponding vascular branches in the target brain region. Multiple electrodes 3 are evenly distributed on the braided wire 2-1 and connected to external signal acquisition equipment via wires 1. The elasticity of the stent 2 enables it to adapt to the diameters and shapes of different blood vessels, ensuring a close fit to the inner wall of the blood vessels while maintaining good biocompatibility.

[0034] Electrode 3 is embedded in the braided wire 2-1 and is made of platinum, a material with excellent conductivity and biocompatibility. It is semi-cylindrical in shape with a maximum diameter of 0.05 to 0.1 mm. The area where the electrode 3 contacts the braided wire 2-1 is coated with an insulating coating 3-1, leaving only the signal acquisition end exposed; preferably, the insulating coating 3-1 is made of polyurethane. Electrodes 3 are distributed in a spiral pattern on the surface of the stent 2. The distribution density of electrodes 3 on the stent 2 can be adjusted based on the common functional distribution of brain regions. For example, a higher density of electrodes can be placed at the location of the superior sagittal sinus corresponding to vascular branches in brain regions such as the motor cortex and visual cortex to achieve high-density signal acquisition in these functional areas.

[0035] The working principle of the present invention is:

[0036] The stent 2 is compressed and pre-installed in the delivery system. During surgery, it is implanted into the target blood vessel, such as the superior sagittal sinus, through a catheter via the jugular vein. During the implantation process, the visualization properties of platinum 2-1-2 are used for precise positioning to ensure that the electrode 3 is accurately implanted near the blood vessel wall corresponding to the target brain area. After release, it expands and fits the blood vessel wall based on its shape memory properties. After the stent 2 fits the blood vessel wall, the electrode 3 is in close contact with the vascular endothelial cells. The wire 1 transmits the EEG signals collected by the electrode 3 to an external signal acquisition device for processing and analysis. Example

[0037] Bracket parameters:

[0038] Braiding wire 2-1 parameters: wire diameter 0.08mm, 12 strands, braiding angle 50°;

[0039] Isolation layer: polyparaxylene, thickness 3μm;

[0040] Electrode distribution: superior sagittal sinus of the cerebral motor cortex blood vessels, with a density of 100 electrodes / cm3.

[0041] Implantation steps:

[0042] Stent 2 is compressed and loaded into the catheter, and then delivered to the superior sagittal sinus via the jugular vein;

[0043] Observe the inner platinum layer 2-1-2 development under X-ray and adjust to the target position;

[0044] The stent 2 is released, and the outer layer 2-1-1 of nickel-titanium alloy expands to conform to the vessel wall;

[0045] Electrode 3 contacts the vascular endothelium, and the EEG signal is transmitted to the external device via wire 1.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A braided EEG signal acquisition bracket, characterized in that: include: Bracket body (2): mesh elastic structure; Electrode (3): distributed on the surface of the support body (2), the surface of the electrode (3) is coated with an insulating layer (3-1) and the signal collection end is exposed; Wire (1): one end is connected to the electrode (3), and the other end is gathered to form a physical interface connected to an external acquisition system.

2. The braided EEG signal acquisition bracket according to claim 1, characterized in that: The stent body (2) has shape memory properties and is implanted into a blood vessel via a catheter in a compressed state, and expands to fit the inner wall of the blood vessel after being released.

3. The braided EEG signal acquisition bracket according to claim 1, characterized in that: The stent body (2) is woven from multiple strands of braided wire (2-1) into a mesh structure.

4. The braided EEG signal acquisition bracket according to claim 3, characterized in that: The braided wire (2-1) comprises, from the inside to the outside, a platinum inner layer (2-1-2), an isolation layer (2-1-3) and a nickel-titanium alloy outer layer (2-1-1); the platinum inner layer (2-1-2) extends to both ends of the braided wire and is used for intravascular positioning under X-ray.

5. A braided EEG signal acquisition bracket according to any one of claims 1 to 4, characterized in that: The number of braided wire strands is 8-16, the wire diameter is 0.05-0.1 mm, and the braiding angle is 45°-60°.

6. The braided EEG signal acquisition bracket according to claim 1, characterized in that: The distribution density of the electrodes (3) is adjusted based on the functional distribution of the target brain area, and the electrode density of the motor cortex or visual cortex corresponding to the blood vessel branches is higher than that of other areas.

7. A braided EEG signal acquisition bracket according to claim 1 or 6, characterized in that: The electrode (3) is a semi-cylindrical platinum electrode with a maximum diameter of 0.05 to 0.1 mm, and is spirally distributed on the surface of the stent body (2).

8. The braided EEG signal acquisition bracket according to claim 4, characterized in that: The isolation layer (2-1-3) is made of polyparaxylene or polyurethane material.

9. The braided EEG signal acquisition bracket according to claim 1, characterized in that: The inner layer of the conductor (1) is platinum, and the outer layer is an insulated conductor of parylene or polyurethane.

10. An electroencephalogram signal acquisition system, characterized in that: The bracket comprises the bracket according to any one of claims 1 to 9, wherein an external signal acquisition device is connected to the wire (1) via a physical interface.

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