Feedthroughs, pulse generators, and stimulation systems

Abstract

The present disclosure provides a feedthrough device for use in a pulse generator, the feedthrough device comprising a main body, at least one feedthrough pin, and a plurality of first electromagnetic shielding layers. The first electromagnetic shielding layer is integrally formed in the main body, and the plurality of first electromagnetic shielding layers are stacked and spaced apart from each other. Each feedthrough pin passes through all the first electromagnetic shielding layers along a first direction, and the feedthrough pin is isolated from any first electromagnetic shielding layer. The present disclosure provides a feedthrough device having a plurality of stacked first electromagnetic shielding layers, so that a portion of the electromagnetic waves passing through the first electromagnetic shielding layer of the first layer will be absorbed or conducted away by the following first electromagnetic shielding layer after reflection, diffraction, etc., or will be reflected or diffracted and absorbed or conducted away again by the previous first electromagnetic shielding layer. The amount of electromagnetic waves passing through the current first electromagnetic shielding layer is significantly reduced compared to the amount of electromagnetic waves passing through the first first electromagnetic shielding layer.

Description

Technical Field

[0001] The present disclosure relates to the field of medical devices, and in particular, to a feedthrough device, a pulse generator having the feedthrough device, and a stimulation system having the pulse generator. Background Art

[0002] In modern medicine, electrical stimulation has extensive clinical experience as a therapeutic approach. By inserting a stimulation system capable of emitting electrical pulses into the human body, electrical pulses are applied to target areas at a specific frequency. Therefore, the stability and accuracy of the stimulation frequency directly determine the therapeutic efficacy of electrical stimulation. Since the pulse signals of electrical stimulation are emitted by the pulse generator in the stimulation system as they are delivered to the stimulation electrodes, these electromagnetic waves can in turn affect the stimulation frequency of the stimulation system, compromising the therapeutic effect.

[0003] Typically, an electromagnetic wave shielding component is installed between the main control board and the stimulation electrodes of the stimulation system to shield the interference electromagnetic waves generated when the main control board is working from outside the main control board.

[0004] However, the shielding capability of traditional electromagnetic wave shielding parts is limited and the electromagnetic wave filtering effect is poor. Summary of the Invention

[0005] The present disclosure aims to improve the filtering effect of electromagnetic waves.

[0006] The present disclosure provides a feedthrough device, which is applied to a pulse generator of an electrical stimulation system. The electrical stimulation system includes the pulse generator and a stimulation electrode. The pulse generator includes a housing for accommodating a main control board. The main control board is used to generate stimulation pulses, which are transmitted to the stimulation electrode and delivered to the patient's tissue via the stimulation electrode. The housing shields electromagnetic waves from passing through. The housing is provided with a feedthrough hole, and the feedthrough device blocks the feedthrough hole. The feedthrough device includes a main body, at least one feedthrough pin, and a plurality of first electromagnetic shielding layers stacked in layers. The feedthrough pin is used to electrically connect the main control board and the stimulation electrode. The first electromagnetic shielding layer is integrally formed in the main body, and the plurality of first electromagnetic shielding layers are stacked and spaced apart along a first direction. Each feedthrough pin passes through the plurality of first electromagnetic shielding layers along the first direction, that is, each feedthrough pin passes through all the first electromagnetic shielding layers along the first direction. The feedthrough pin is isolated from any first electromagnetic shielding layer.

[0007] The traditional electromagnetic shielding device used in the pulse generator to isolate the electromagnetic waves from the main control board of the excitation pulse signal has a single-layer metal shielding layer. Multiple wires pass through the shielding layer and are connected to the main control board and the stimulation electrode at both ends. The first electromagnetic shielding layer and the wires need to be electrically isolated to avoid signal mixing between the multiple wires through the first electromagnetic shielding layer. This will cause a small amount of electromagnetic waves to pass through the gap between the first electromagnetic shielding layer and the wires. It is traditionally believed that this single-layer metal shielding structure is sufficient to meet the shielding requirements, and the electromagnetic waves passing through the gap have a relatively weak impact on the main control board. However, in clinical treatment, as the use time continues to increase, the accumulation of long-term weak stimulation still affects the pulse emission frequency and reduces the service life of the pulse generator.

[0008] The present disclosure provides a feedthrough device having multiple stacked first electromagnetic shielding layers, so that electromagnetic waves passing through the first electromagnetic shielding layer of the first layer, after undergoing reflection, diffraction, etc., will be partially absorbed or guided out by the subsequent first electromagnetic shielding layer, or reflected or diffracted and then absorbed or guided out again by the previous first electromagnetic shielding layer, or continue to be reflected or diffracted by the previous first electromagnetic shielding layer and then absorbed or guided out by the current first electromagnetic shielding layer, and so on. In this case, the amount of electromagnetic waves passing through the current first electromagnetic shielding layer is significantly reduced compared to the amount of electromagnetic waves passing through the first first electromagnetic shielding layer.

[0009] Therefore, the stacked first electromagnetic shielding layer prolongs the time it takes for the accumulation of electromagnetic waves to reach a level that affects the pulse emission frequency, thereby extending the service life.

[0010] In one exemplary embodiment, the first electromagnetic shielding layer is a metal foil having at least one through-hole. That is, the area of ​​the electromagnetic shielding layer not occupied by the through-hole is dense, rather than a grid structure, so that electromagnetic waves are completely reflected or absorbed when they contact the second area.

[0011] Traditional electromagnetic shielding layers are mostly mesh structures, which can usually shield electromagnetic waves of most wavelengths. However, some frequencies of electromagnetic waves can still pass through the mesh holes and pass through the electromagnetic shield, interfering with the pulse excitation process of the main control board, resulting in the pulse being unable to be emitted to the target area of ​​the human body at the predetermined frequency.

[0012] The first electromagnetic shielding layer is a sheet-like metal structure. The area where the through-holes are located is the first region, and the rest of the area is the second region. Because the second region is dense, electromagnetic waves are reflected or absorbed as much as possible when they come into contact with the second region. By making these improvements to the structure of each layer of the multi-layer first electromagnetic shielding layer, the service life of the pulse generator can be further extended.

[0013] In an exemplary embodiment, each first electromagnetic shielding layer is separated from the feedthrough pin by at least a first gap, and the feedthrough pin has at least one first annular protrusion on its outer periphery. The first annular protrusion is configured to absorb or reflect electromagnetic waves in space, wherein, on a projection plane perpendicular to the first direction, the orthographic projection of each first annular protrusion overlaps the orthographic projection of the adjacent first gap. In other words, when some electromagnetic waves pass through a first gap at an angle directly toward the adjacent first gap, each first annular protrusion is on the path of these electromagnetic waves. As a result, after passing through a first gap, all electromagnetic waves cannot pass through subsequent first gaps without being reflected, refracted, or diffracted by the first electromagnetic shielding layer.

[0014] In an exemplary embodiment, the width of the first gap is the minimum dielectric distance between the feedthrough pin and the first electromagnetic shielding layer, so as to minimize the amount of electromagnetic waves passing through the first gap.

[0015] In one exemplary embodiment, the feedthrough pin has two second annular protrusions at each end. These two second annular protrusions serve as solder pads for receiving wires connected to the stimulation electrode and the main control board, respectively. On a projection plane perpendicular to the first direction, the orthographic projection of each second annular protrusion overlaps the orthographic projection of the adjacent first gap. This means that the second annular protrusions provide a certain degree of shielding for electromagnetic waves before they contact the first electromagnetic shielding layer of the feedthrough device.

[0016] As we know, in the first direction, electromagnetic waves in space are not blocked by any means before entering the first gaps at both ends. The angle range over which electromagnetic waves enter the first gaps through direct radiation is relatively large. By providing second annular protrusions, and ensuring that the orthographic projection of each second annular protrusion overlaps the orthographic projection of the adjacent first gap on a projection plane perpendicular to the first direction, the direct radiation of electromagnetic waves is reduced.

[0017] In one exemplary embodiment, a second electromagnetic shielding layer is embedded in each of two opposing surfaces of the main body in the first direction. Each second electromagnetic shielding layer is flush with a second annular protrusion in the first direction, and a second gap separates the second electromagnetic shielding layer from the second annular protrusion. On a projection plane perpendicular to the first direction, the orthographic projection of the first electromagnetic shielding layer overlaps the orthographic projection of the adjacent second gap. In other words, the second annular protrusion can be used to further enhance the electromagnetic shielding performance of the feedthrough device.

[0018] In one exemplary embodiment, the width of the second gap is the minimum dielectric distance from the feedthrough pin to the second electromagnetic shielding layer, and the width of the second gap is greater than the width of the first gap. Because the second electromagnetic shielding layer is located on the surface of the feedthrough device, it is equivalent to being partially exposed to air. Compared to the second electromagnetic shielding layer, the first electromagnetic shielding layer and the feedthrough pin are separated only by the insulating feedthrough device body material, while the second electromagnetic shielding layer and the feedthrough device body material also include a portion of air. Therefore, the conductivity from the feedthrough pin to the second electromagnetic shielding layer is greater than the conductivity from the feedthrough pin to the first electromagnetic shielding layer. The present disclosure sets the width of the second gap to the minimum dielectric distance from the feedthrough pin to the second electromagnetic shielding layer, and sets the width of the second gap to be greater than the width of the first gap, so as to minimize the amount of electromagnetic waves passing through the second gap.

[0019] In an exemplary embodiment, the width of the second gap is at least 0.2 mm greater than the width of the first gap.

[0020] In an exemplary embodiment, one of the at least one first annular protrusion is at least flush with a corresponding first electromagnetic shielding layer. This allows the first gap between the first electromagnetic shielding layer and the first annular protrusion to be spaced away from the feedthrough body. Consequently, after an electromagnetic wave is reflected by the feedthrough body, the angular range over which it can directly enter and pass through the first gap away from the feedthrough body is smaller than the angular range over which an electromagnetic wave can directly enter and pass through the first gap immediately adjacent to the feedthrough body after being reflected by the feedthrough body. This further reduces the amount of electromagnetic waves that can pass through the first gap after being reflected by the feedthrough body.

[0021] In a second aspect, the present disclosure also provides a pulse generator, which includes a shell, a main control board and a feedthrough device as in the first aspect. The shell accommodates the main control board, and the main control board is used to generate stimulation pulses. The stimulation pulses are transmitted to the stimulation electrodes and delivered to the patient's tissues through the stimulation electrodes. The shell shields the passage of electromagnetic waves. The shell is provided with a feedthrough hole, and the feedthrough device blocks the feedthrough hole.

[0022] In a third aspect, the present disclosure further provides a stimulation system, which includes a stimulation electrode and the pulse generator as described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate some embodiments of the present disclosure, not all.

[0024] It should be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements (components or components).

[0025] It should be understood that the drawings are merely schematic and that the sizes and proportions of elements (components or components) in the drawings are not necessarily accurate.

[0026] Figure 1 A schematic diagram of an exemplary stimulation system according to an embodiment of the present disclosure.

[0027] Figure 2 for Figure 1 Schematic breakdown of the stimulation system in .

[0028] Figure 3 A top plan view of an exemplary feedthrough arrangement according to an embodiment of the present disclosure.

[0029] Figure 4 A schematic cross-sectional view of an exemplary feedthrough device according to an embodiment of the present disclosure.

[0030] Figure 5 A diagram showing the reflection and diffraction states of electromagnetic waves in an exemplary feed-through device provided in one embodiment of the present disclosure.

[0031] Figure 6 A schematic cross-sectional view of an exemplary feed-through device according to another embodiment of the present disclosure is provided.

[0032] Figure 7 A schematic cross-sectional view of an exemplary feed-through device according to another embodiment of the present disclosure is provided.

[0033] Figure 8 A schematic cross-sectional view of an exemplary feed-through device provided according to yet another embodiment of the present disclosure.

[0034] Figure 9A The diagram shows the incident angle of electromagnetic waves in one case.

[0035] Figure 9B The figure shows the incident angle of the electromagnetic wave in another case.

[0036] Figure 10 A schematic structural diagram of an exemplary feed-through device provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments.

[0038] like Figure 1-Figure 2As shown, in an exemplary embodiment, the present disclosure provides an electrical stimulation system for applying electrical stimulation to a target area to achieve a therapeutic effect. The stimulation system includes a stimulation electrode 10 and a pulse generator 20. The input end of the stimulation electrode 10 is connected to the pulse generator 20 via multiple wires. The electrical signal from the pulse generator 20 is transmitted through the stimulation electrode 10 to deliver electromagnetic pulses to the target area to be stimulated in the patient's body, thereby achieving electrical stimulation of the target area.

[0039] like Figure 2 As shown, a pulse generator 20 is also provided, which includes a shell 26, a main control board 25 and a feedthrough device 23 as described in the first aspect. The shell 26 accommodates the main control board 25, and the main control board 25 is used to generate stimulation pulses. The stimulation pulses are transmitted to the stimulation electrode 10 and delivered to the patient's tissue through the stimulation electrode 10. The shell 26 shields the passage of electromagnetic waves. The shell 26 is provided with a feedthrough hole 28, and the feedthrough device 23 blocks the feedthrough hole 28.

[0040] like Figure 2-Figure 5 As shown, in an exemplary embodiment, the present disclosure provides a feedthrough device 23, which is applied to a pulse generator 20. The stimulation electrode 10 is inserted into the pulse generator 20, and the main control board 25 is located within the housing of the pulse generator 20. The feedthrough device 23 seals the upper housing 21 and the lower housing 22 to isolate electromagnetic waves between the stimulation electrode 10 and the main control board 25. The housing of the pulse generator 20 is made of metal material to shield the main control board from interference from external electromagnetic waves.

[0041] In an exemplary embodiment, Figure 2-Figure 4 As shown, the feedthrough device 23 includes a main body 231, at least one feedthrough pin 232, and multiple first electromagnetic shielding layers 233 stacked and spaced apart along a first direction. Each feedthrough pin 232 passes through the multiple first electromagnetic shielding layers 233 along the first direction, that is, each feedthrough pin 232 passes through all of the first electromagnetic shielding layers 233 along the first direction. The feedthrough pins 232 are used to electrically connect the main control board 25 and the stimulation electrodes 10. The first electromagnetic shielding layers 233 are integrally formed with the main body 231. The multiple first electromagnetic shielding layers 233 are spaced apart from each other. Each first electromagnetic shielding layer 233 has at least one through-hole 2331, and different first electromagnetic shielding layers 233 have the same number of through-holes 2331. Each feedthrough pin 232 passes through one through-hole 2331 in each first electromagnetic shielding layer 233 along the first direction, and the feedthrough pins 232 are electrically isolated from each first electromagnetic shielding layer 233. Each electrode contact on the stimulation electrode 10 and a corresponding signal output terminal on the main control board 25 are connected to a corresponding feedthrough pin on the feedthrough device 23 via a wire 30, thereby achieving communication between the stimulation electrode 10 and the main control board 25. To prevent mixing of pulse signals, different wires 30 are electrically isolated from each other, and the feedthrough pins 232 are electrically isolated from each other.

[0042] To ensure electrical isolation between the multiple feedthrough pins 232, each feedthrough pin 232 needs to be electrically isolated from the first electromagnetic shielding layer 233. That is, the edge of the through hole 2331 does not contact the feedthrough pin 232. A gap exists between the through hole 2331 and the feedthrough pin 232 to allow electromagnetic waves to pass through.

[0043] like Figure 5 As shown, the present disclosure provides a feedthrough device having multiple stacked first electromagnetic shielding layers 233, so that electromagnetic waves passing through the first first electromagnetic shielding layer 233, after undergoing reflection, diffraction, etc., will be partially absorbed, guided, and / or reflected, diffracted, and then absorbed or guided again by the first first electromagnetic shielding layer 233 and / or further reflected or diffracted by the first first electromagnetic shielding layer 233 and then absorbed or guided by the second first electromagnetic shielding layer 233, and so on. At this point, the amount of electromagnetic waves passing through the second first electromagnetic shielding layer 233 is significantly reduced compared to the amount of electromagnetic waves passing through the first first electromagnetic shielding layer 233. When there are more than two electromagnetic shielding layers, the electromagnetic waves in any adjacent electromagnetic shielding layers can be reflected and / or diffracted in the above manner. The electromagnetic waves shown in the figure are merely exemplary, and their wavelength, width, etc. are only used to schematically explain the change in amount after reflection and diffraction by the first electromagnetic shielding layer.

[0044] Therefore, the stacked first electromagnetic shielding layer 233 prolongs the time it takes for the accumulation of electromagnetic waves to reach a level that affects the pulse emission frequency, thereby extending the service life.

[0045] In some embodiments, the first electromagnetic shielding layer is connected to a power source of the pulse generator via a wire. When powered, if electromagnetic waves contact the energized first electromagnetic shielding layer, a portion of them will be converted into heat energy and absorbed by the first electromagnetic shielding layer. The electric field generated by the energized first electromagnetic shielding layer will cause the electromagnetic waves to reflect, refract, or scatter, further reducing the likelihood of electromagnetic waves passing through the first electromagnetic shielding layer.

[0046] The main body 231 is formed by casting a mold, so that the first electromagnetic shielding layer 233 is embedded in the main body 231 .

[0047] In an exemplary embodiment, Figure 3 As shown, the first electromagnetic shielding layer 233 is a metal foil having at least one through-hole 2331. That is, the area of ​​the first electromagnetic shielding layer 233 not occupied by the through-hole 2331 is dense, rather than a grid structure. This allows electromagnetic waves to be completely reflected or absorbed when they reach the second area when power is applied to the first electromagnetic shielding layer 233.

[0048] Traditional electromagnetic shielding layers are often mesh-like structures, which typically shield most wavelengths of electromagnetic waves. However, some frequencies can still penetrate the mesh and interfere with the main control board's pulse excitation process, preventing the pulse from being transmitted at the intended frequency to the target area of ​​the human body. This embodiment further extends the service life of the pulse generator 20 by making the aforementioned improvements to the structure of each layer of the multi-layer first electromagnetic shielding layer.

[0049] like Figure 6 As shown, in an exemplary embodiment, each first electromagnetic shielding layer 233 is separated from the feedthrough pin 232 by at least a first gap G1. The feedthrough pin 232 has at least one first annular protrusion 234 on its outer periphery. The first annular protrusion 234 is configured to absorb or reflect electromagnetic waves in space. On a projection plane perpendicular to the first direction, the orthographic projection of each first annular protrusion 234 overlaps the orthographic projection of the adjacent first gap. In other words, when some electromagnetic waves pass through a first gap G1 and are directed directly toward the adjacent first gap G1, each first annular protrusion 234 is on the path of these electromagnetic waves. This ensures that after passing through a first gap G1, all electromagnetic waves cannot pass through subsequent first gaps G1 without being reflected, refracted, or diffracted by the first electromagnetic shielding layer 233.

[0050] For example, in the first direction, there is a first annular protrusion 234 between two adjacent first electromagnetic shielding layers 233. Each first annular protrusion 234 is staggered with at least one first electromagnetic shielding layer 233 in the first direction.

[0051] In an exemplary embodiment, Figure 7 As shown, one of the at least one first annular protrusion 234 is flush with a corresponding first electromagnetic shielding layer 233. The at least one first annular protrusion 234 is arranged flush with a first annular protrusion 234, so that the first gap G1 between the first electromagnetic shielding layer 233 and the first annular protrusion 234 is away from the main body 2321 of the feed-through device 23. Subsequently, the angle range W of the electromagnetic wave that can directly enter and pass through the first gap G1 away from the main body 2321 of the feed-through device 23 after being reflected by the main body of the feed-through device 23 will be smaller than the angle range W1 of the electromagnetic wave that can directly enter and pass through the first gap G1 adjacent to the main body 2321 of the feed-through device 23 after being reflected by the main body of the feed-through device 23. This further reduces the amount of electromagnetic waves that can pass through the first gap G1 away from the main body 2321 of the feed-through device 23 after being reflected by the main body of the feed-through device 23. The reflection method of the electromagnetic wave can be referred to. Figure 6 The embodiment shown.

[0052] In an exemplary embodiment, the width of the first gap is the minimum dielectric distance from the feedthrough pin to the first electromagnetic shielding layer, so as to minimize the amount of electromagnetic waves passing through the first gap.

[0053] In an exemplary embodiment, Figure 8 As shown, the feedthrough pin 232 has two second annular protrusions 235 at each end. The two second annular protrusions 235 serve as solder pads for receiving wires connected to the pads of the stimulation electrodes and the main control board, respectively. On a projection plane perpendicular to the first direction, the orthographic projection of each second annular protrusion 235 overlaps the orthographic projection of the adjacent first gap G1. In other words, the second annular protrusions 235 can provide a certain degree of shielding for electromagnetic waves before they contact the first electromagnetic shielding layer 233 of the feedthrough device 23.

[0054] like Figure 9A As shown, the angle at which the first gap G1 can receive electromagnetic waves directly incident thereon is shown. In the first direction, electromagnetic waves in space are not blocked in any way before entering the first gaps G1 at both ends, and the angle α of electromagnetic waves directly entering the first gap G1 is relatively large.

[0055] like Figure 9B As shown, by providing a second annular protrusion 235 and making the orthographic projection of each second annular protrusion 235 cover the orthographic projection of the first gap G1 adjacent to it on the projection plane perpendicular to the first direction, the second annular protrusion 235 at least partially blocks the path of electromagnetic waves in space that can directly enter the first gap G1, so that the angle β range of the electromagnetic waves directly entering the first gap G1 is smaller than α, thereby reducing the direct (i.e., unreflected) electromagnetic waves.

[0056] In an exemplary embodiment, Figure 8 As shown, a second electromagnetic shielding layer 236 is embedded in each of two opposing surfaces of the main body 231 in the first direction. Each second electromagnetic shielding layer 236 is flush with a second annular protrusion 235 in the first direction, and a second gap G2 separates the second electromagnetic shielding layer 236 from the second annular protrusion 235. On a projection plane perpendicular to the first direction, the orthographic projection of the first electromagnetic shielding layer 233 overlaps the orthographic projection of the adjacent second gap G2. This allows the second annular protrusions to further enhance the electromagnetic shielding performance of the feedthrough device.

[0057] In an exemplary embodiment, Figure 10As shown, the width of the second gap G2 is the minimum dielectric distance from the feedthrough pin 232 to the second electromagnetic shielding layer 236, and the width of the second gap G2 is greater than the width of the first gap G1. Because the second electromagnetic shielding layer 236 is located on the surface of the feedthrough, it is equivalent to being partially exposed to air. Compared to the second electromagnetic shielding layer 236, the first electromagnetic shielding layer 233 and the feedthrough pin 232 are separated only by the insulating material of the feedthrough body 231, while the second electromagnetic shielding layer 236 and the feedthrough body 231 material also include a portion of air. Therefore, the conductivity from the feedthrough pin 232 to the second electromagnetic shielding layer 236 is greater than the conductivity from the feedthrough pin 232 to the first electromagnetic shielding layer 233. In the present disclosure, the width of the second gap G2 is set to the minimum dielectric distance from the feedthrough pin 232 to the second electromagnetic shielding layer 236, and the width of the second gap G2 is set to be greater than the width of the first gap G1, so as to minimize the amount of electromagnetic waves passing through the second gap G2.

[0058] In an exemplary embodiment, the width of the second gap is at least 0.2 mm greater than the width of the first gap.

[0059] It should be understood that the term “including” and its variations used in the present disclosure are open inclusions, that is, “including but not limited to.” The term “one embodiment” means “at least one embodiment,” and the term “another embodiment” means “at least one additional embodiment.”

[0060] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A feedthrough device, applied to a pulse generator of an electrical stimulation system, wherein the electrical stimulation system comprises the pulse generator and stimulation electrodes, the pulse generator comprises a housing for accommodating a main control board, the main control board is used to generate stimulation pulses, the stimulation pulses are transmitted to the stimulation electrodes and delivered to the patient's tissue via the stimulation electrodes, the housing shields electromagnetic waves, the housing is provided with a feedthrough hole, the feedthrough device blocks the feedthrough hole, and is characterized in that: The feed-through device comprises: main body; at least one feedthrough pin, used for electrically connecting the main control board and the stimulation electrode; and A plurality of first electromagnetic shielding layers are stacked and spaced apart along a first direction and are integrally formed with the main body. Each feedthrough pin passes through the plurality of first electromagnetic shielding layers along the first direction, and the feedthrough pin is isolated from any first electromagnetic shielding layer. Each first electromagnetic shielding layer is separated from the feedthrough pin by at least a first gap, and the feedthrough pin has at least one first annular protrusion on the outer periphery, and the first annular protrusion is configured to absorb or reflect electromagnetic waves in space; on the projection plane perpendicular to the first direction, the orthographic projection of each first annular protrusion covers the orthographic projection of the first gap adjacent to it in the first direction, so as to block electromagnetic waves passing through a first gap and radiating toward the adjacent first gap along the first direction.

2. The feed-through device according to claim 1, wherein: Each first electromagnetic shielding layer has at least one through hole, and each feedthrough pin passes through a through hole in each first electromagnetic shielding layer along the first direction. The first electromagnetic shielding layer is a metal foil provided with the at least one through hole.

3. The feed-through device according to claim 1, wherein: The width of the first gap is the minimum dielectric distance from the feedthrough pin to the first electromagnetic shielding layer.

4. The feed-through device according to claim 3, characterized in that The feedthrough pin has two second annular protrusions at both ends, respectively, and the two second annular protrusions serve as solder pads for receiving wires respectively connected to the solder pads of the stimulation electrode and the main control board; on the projection plane perpendicular to the first direction, the orthographic projection of each second annular protrusion covers the orthographic projection of the first gap adjacent to it in the first direction.

5. The feed-through device according to claim 4, characterized in that A second electromagnetic shielding layer is embedded in each of the two opposite surfaces of the main body in the first direction, each second electromagnetic shielding layer is flush with a second annular protrusion in the first direction, and the second electromagnetic shielding layer is separated from the second annular protrusion by a second gap; on the projection plane perpendicular to the first direction, the orthographic projection of the first electromagnetic shielding layer covers the orthographic projection of the second gap adjacent to it.

6. The feed-through device according to claim 5, characterized in that The width of the second gap is the minimum dielectric distance from the feed-through pin to the second electromagnetic shielding layer, and the width of the second gap is greater than the width of the first gap.

7. The feed-through device according to claim 6, characterized in that The width of the second gap is at least 0.2 mm greater than the width of the first gap.

8. The feed-through device according to claim 1, wherein: One of the at least one first annular protrusion is flush with a corresponding first electromagnetic shielding layer.

9. A pulse generator, comprising a shell, a main control board and a feedthrough device as described in any one of claims 1 to 8, wherein the shell accommodates the main control board, the main control board is used to generate stimulation pulses, the stimulation pulses are transmitted to the stimulation electrodes and delivered to the patient's tissue through the stimulation electrodes, the shell shields the passage of electromagnetic waves, the shell is provided with a feedthrough hole, and the feedthrough device blocks the feedthrough hole. 10 . A stimulation system comprising a stimulation electrode and the pulse generator according to claim 9 .

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