Cortical visual prosthesis implantable antenna based on water-based medium resonance

Abstract

The application discloses a cortex visual prosthesis implantable antenna based on water-based medium resonance and belongs to the technical field of medical devices, which comprises a ring-shaped shell, a ring-shaped inner shell is arranged in the ring-shaped shell, a through groove is formed in the side wall of the ring-shaped inner shell, the through groove is communicated with the inner space of the ring-shaped shell and the inner space of the ring-shaped inner shell to form a water cavity, a water body is arranged in the water cavity, a metal floor is fixedly connected to the bottom end of the ring-shaped shell and the ring-shaped inner shell, a top shell is fixedly connected to the top end of the ring-shaped shell and the ring-shaped inner shell, a coaxial feeder is embedded in the ring-shaped inner shell and the top shell, and the outer conductor of the coaxial feeder is connected with the metal floor; the water-based medium resonance antenna is arranged, the use of metal structures is reduced, the volume is reduced, the current on the irregular metal can be prevented from increasing ohmic loss to increase the risk of thermal damage, the effective thermal protection performance is ensured, and the strict requirement of human brain tissue on thermal protection is met.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a cortical visual prosthesis implantable antenna based on water-based dielectric resonance. Background Technology

[0002] According to statistics from the World Health Organization, by the 2020s, 43.3 million people worldwide would be completely blind, and nearly 300 million people would be affected by severe visual impairment, and the number of visually impaired people would continue to increase in the future.

[0003] Cortical visual prosthesis technology can directly electrically stimulate the visual cortex through medical implants placed on the surface of the cerebral cortex, inducing visual perception and completely solving the problem of blindness. It has been widely used in related fields.

[0004] In the application of cortical vision prosthesis technology, in order to avoid the risk of infection caused by leaving a cranial wound, the device working in the brain generally uses wireless communication with external devices. Therefore, the quality of the implant's wireless communication directly determines the basic performance of the overall device, that is, the quality of the implant's wireless communication carrier is crucial.

[0005] Existing cortical vision prosthesis implants typically use implantable antennas for wireless communication. However, the implantable antennas currently used in cortical vision prostheses are usually patch antennas. The current on the irregular metal surface generates ohmic losses, which increases the risk of thermal damage and makes it difficult to meet the stringent thermal protection requirements of human brain tissue.

[0006] In view of this, a cortical visual prosthesis implantable antenna based on water-based dielectric resonance is designed to solve the above problems. Summary of the Invention

[0007] To address the problems mentioned in the background section, this invention provides a cortical visual prosthesis implantable antenna based on water-based dielectric resonance, which features high biocompatibility, high electromagnetic compatibility, strong anti-interference capability, low cost, and simple structure that is easy to manufacture.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a cortical visual prosthesis implantable antenna based on water-based dielectric resonance, comprising: an annular outer shell, an annular inner shell disposed inside the annular outer shell, a through groove formed on the side wall of the annular inner shell, the through groove connecting the internal space of the annular outer shell and the internal space of the annular inner shell to form a water cavity, water being disposed inside the water cavity, a metal ground plane fixedly connected to the bottom end of the annular outer shell and the annular inner shell, a top shell fixedly connected to the top end of the annular outer shell and the annular inner shell, an assembly groove formed at the top end of the top shell, a slotted annular metal microstrip embedded inside the assembly groove, an outer conductor of a coaxial feed line connected to the metal ground plane, and an inner conductor of the coaxial feed line embedded inside the annular inner shell and the top shell and connected to the slotted annular metal microstrip.

[0009] Furthermore, the annular outer shell, annular inner shell, and top shell are all made of cured 405nm photosensitive resin, a 3D printing material.

[0010] Furthermore, the through slot is a vertical structure, with the center of the annular inner shell as the origin, and the position of the through slot relative to the coaxial feed line is... Axisymmetric.

[0011] Furthermore, the water body is distilled water.

[0012] Furthermore, the cortical visual prosthesis implantable antenna based on water-based dielectric resonance is applied to the cerebrospinal fluid tissue between the brain tissue surface and the arachnoid membrane.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The present invention sets up a water-based dielectric resonant antenna, which can reduce the use of metal structures, reduce the volume, and avoid the ohmic loss generated by the current on irregular metal, thereby increasing the risk of thermal damage and ensuring effective thermal protection performance, meeting the stringent requirements of human brain tissue for thermal protection.

[0015] 2. The annular outer shell and the annular inner shell with through grooves form a water cavity. Water is placed in the water cavity. Under the enveloping effect of the water, the annular outer shell and the annular inner shell function as a resonant cavity and are excited to generate two mutually orthogonal modes, realizing circularly polarized radiation waves directly above. This avoids stray radiation and can broaden the impedance bandwidth to improve working stability.

[0016] 3. This invention has the advantages of high biocompatibility, high electromagnetic compatibility, strong anti-interference ability, low cost, and simple structure that is easy to manufacture. Attached Figure Description

[0017] Figure 1 The diagram shows the structure of the present invention, wherein (a) is an exploded view of the structure, (b) is a top view of a slice of the cavity, (c) is an overall top view, and (d) is a front view;

[0018] Figure 2 This is a graph showing the scattering parameters and the axial ratio in the target direction near the target frequency band, as a function of frequency.

[0019] Figure 3 This is the actual gain pattern at the operating frequency of this invention;

[0020] Figure 4 This is a schematic diagram of the workflow of the present invention;

[0021] In the diagram: 1. Slotted annular metal microstrip; 2. Assembly slot; 3. Top shell; 4. Water body; 5. Coaxial feeder; 6. Through slot; 7. Annular inner shell; 8. Annular outer shell; 9. Metal floor. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] See appendix Figure 1 (a):

[0024] A cortical visual prosthesis implantable antenna based on water-based dielectric resonance includes: an annular outer shell 8, an annular inner shell 7 inside the annular outer shell 8, a through slot 6 on the side wall of the annular inner shell 7, the through slot 6 connecting the internal space of the annular outer shell 8 and the internal space of the annular inner shell 7 to form a water cavity, water 4 inside the water cavity, a metal ground plane 9 fixedly connected to the bottom of the annular outer shell 8 and the annular inner shell 7, a top shell 3 fixedly connected to the top of the annular outer shell 8 and the annular inner shell 7, an assembly slot 2 on the top of the top shell 3, a slotted annular metal microstrip 1 embedded in the assembly slot 2, an outer conductor of a coaxial feed line 5 connected to the metal ground plane 9, and an inner conductor of the coaxial feed line 5 embedded in the annular inner shell 7 and the top shell 3 and connected to the slotted annular metal microstrip 1.

[0025] The annular outer shell 8 and the annular inner shell 7, enclosed by the water body 4, function as a resonant cavity, and are excited to produce two mutually orthogonal modes, which can realize circularly polarized radiation waves directly above, while reducing ohmic loss and widening the impedance bandwidth.

[0026] Specifically, the annular outer shell 8, the annular inner shell 7, and the top shell 3 are all made of cured 405nm photosensitive resin, a 3D printing material.

[0027] Specifically, the through slot 6 is a vertical structure, with the center of the annular inner shell 7 as the origin. The position of the through slot 6 relative to the coaxial feed line 5 is... Axisymmetric.

[0028] The included angle value varies depending on the actual usage. The change in the included angle value can alter the distribution of water body 4 and adjust the performance of the implanted antenna.

[0029] Specifically, water body 4 is distilled water.

[0030] Specifically, a cortical visual prosthesis implantable antenna based on water-based dielectric resonance is applied to the cerebrospinal fluid tissue between the brain tissue surface and the arachnoid membrane. Example

[0031] See appendix Figure 1 (b), (c) and (d):

[0032] Height of the annular shell 8 2.2mm, width It is 0.6mm and the radius It has a thickness of 6.0 mm, a dielectric constant of 2.7, and a loss tangent of 0.02.

[0033] Height of the annular inner shell 7 2.2mm, width It is 0.6mm and the radius It has a thickness of 4.3 mm, a dielectric constant of 2.7, and a loss tangent of 0.02.

[0034] The width of the water cavity between the annular outer shell 8 and the annular inner shell 7 It is 0.8mm;

[0035] Width of through slot 6 It is 0.3mm;

[0036] The line connecting the center of the through slot 6 and the center of the annular inner shell 7 and The angle between the positive and negative half axes ;

[0037] The dielectric constant of water body 4 is 81, and the loss tangent is 0.001.

[0038] Metal floor height 9 It is 0.3mm;

[0039] Height of top shell 3 The thickness is 0.5mm and the inclined surface thickness is... It has a thickness of 0.5 mm, a dielectric constant of 2.7, and a loss tangent of 0.02.

[0040] Width of slotted annular metal microstrip 1 It is 0.2mm and the distance from the edge of the inclined surface It is 1.1mm;

[0041] The annular inner shell 7 is divided into two fan-shaped rings, one long and one short, by the through slot 6 and the coaxial feed line 5. These generate two resonances at low and high frequencies near the target frequency band, respectively, introducing two poles in the scattering parameter curve and producing a wider impedance bandwidth covering the target frequency band. At the same time, circular polarization performance is obtained at the target frequency band.

[0042] Implantable antennas are implanted near the human brain. The distribution of human tissues is complex, and the electrical characteristics of different tissues are very different, which can easily cause frequency shift, multipath effect and polarization mismatch. The resulting wider impedance bandwidth covering the target frequency band can counteract frequency shift.

[0043] Due to factors such as clinical operational errors during implantation, the complex structure of the human brain, differences in electrical properties of different human tissues, and human movement, implantable antennas may experience problems such as polarization mismatch and multipath attenuation in their working environment. Achieving circular polarization performance at the target frequency band, i.e., circular polarization radiation, can effectively counteract these uncertainties and improve operational stability.

[0044] See appendix Figure 2 and 3 :

[0045] The cortical visual prosthesis implantable antenna based on water-based dielectric resonance has a -10 dB |S11| impedance bandwidth of at least 2–4 GHz and a 3 dB axial ratio bandwidth of at least 2.4–2.485 GHz.

[0046] The half-power beam of the cortical vision prosthesis implantable antenna based on water-based dielectric resonance covers at least directly above the axis of the annular shell 8 and the top shell 3, and in this direction, the axial ratio at the 2450 MHz frequency point is less than 3 dB.

[0047] See appendix Figure 4 :

[0048] An integrated system for implantable antennas includes an implantable antenna, an implantable processor, and an electrode array.

[0049] Implantable antennas are applied to the cerebrospinal fluid tissue between the surface of brain tissue and the arachnoid mater;

[0050] After the external device captures and processes the visual information, it transmits it to the implantable antenna via a wireless link. The implantable antenna then transmits the signal to the implantable processor. After demodulation, the implantable processor controls the electrode array, which is in direct contact with the cerebral cortex, to discharge as needed, stimulating the cerebral cortex to induce visual perception and thus restore vision.

[0051] 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 water-based medium resonant based cortical visual prosthesis implantable antenna, characterized by, The utility model relates to a water-based medium resonance based cortical visual prosthesis implantable antenna, which comprises: An annular outer shell (8) is internally provided with an annular inner shell (7), a through slot (6) is formed in the sidewall of the annular inner shell (7), the through slot (6) communicates the internal space of the annular outer shell (8) with the internal space of the annular inner shell (7) to form a water cavity, a water body (4) is arranged in the water cavity, a metal floor (9) is fixedly connected to the bottom end of the annular outer shell (8) and the annular inner shell (7), a top shell (3) is fixedly connected to the top end of the annular outer shell (8) and the annular inner shell (7), an assembly groove (2) is formed in the top end of the top shell (3), a slotted annular metal microstrip (1) is embedded in the assembly groove (2), an outer conductor of a coaxial feeder (5) is connected to the metal floor (9), an inner conductor of the coaxial feeder (5) is embedded in the annular inner shell (7) and the top shell (3) and is connected to the slotted annular metal microstrip (1).

2. The water-based medium resonant-based cortical visual prosthesis implantable antenna of claim 1, wherein: The annular outer shell (8), the annular inner shell (7) and the top shell (3) are all made of cured 3D printing material 405 nm photosensitive resin.

3. The water-based medium resonant-based cortical visual prosthesis implantable antenna of claim 2, wherein: The through slot (6) is vertically arranged, and the center of the annular inner shell (7) is taken as the origin, and the through slot (6) and the coaxial feeder (5) are symmetric about the y-axis.

4. The water-based medium resonant-based cortical visual prosthesis implantable antenna of claim 3, wherein: The water body (4) is distilled water.

5. The water-based medium resonant-based cortical visual prosthesis implantable antenna of claim 4, wherein: The water-based medium resonance based cortical visual prosthesis implantable antenna is applied to the cerebrospinal fluid tissue between the brain tissue surface and the arachnoid membrane.

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