Feed-through device, pulse generator and stimulation system

Abstract

The invention provides a feed-through device, which is applied to a pulse generator and comprises a main body, at least one feed-through pin and a plurality of first electromagnetic shielding layers. The first electromagnetic shielding layers are integrally formed on the main body, and the multiple first electromagnetic shielding layers are stacked and arranged at intervals. Each feed-through pin passes through all the first electromagnetic shielding layers along the first direction, and the feed-through pin is isolated from any one of the first electromagnetic shielding layers. According to the feed-through device provided by the invention, the plurality of stacked first electromagnetic shielding layers are provided, so that a part of electromagnetic waves penetrating through the first electromagnetic shielding layer of the first layer can be absorbed or guided out by the first electromagnetic shielding layer behind in the processes of reflection, diffraction and the like; or is reflected or diffracted to be absorbed or led out by the upper first electromagnetic shielding layer again. The amount of electromagnetic waves passing through the current first electromagnetic shielding layer is greatly reduced compared with the amount of electromagnetic waves passing through the 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 rich clinical experience as a treatment method. By inserting a stimulation system that can emit electrical pulses into the human body, electrical pulses are applied to the target area at a specific frequency. Therefore, the stability and accuracy of the stimulation frequency will directly determine the therapeutic effect of electrical stimulation. Since the pulse signal of electrical stimulation will emit electromagnetic waves when the pulse generator in the stimulation system sends the pulse signal to the stimulation electrode, these electromagnetic waves will in turn affect the stimulation frequency of the stimulation system and affect the treatment effect.

[0003] Usually, people will install an electromagnetic wave shielding component between the main control board and the stimulation electrode of the stimulation system to shield the interference electromagnetic waves generated when the main control board is working outside the main control board.

[0004] However, the shielding capability of conventional electromagnetic wave shielding components 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 shell 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 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. The feedthrough device includes a main body, at least one feedthrough pin, and a plurality of first electromagnetic shielding layers stacked. 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 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 electromagnetic shielding device traditionally used in pulse generators to isolate electromagnetic waves from the main control board of the excitation pulse signal has a single-layer metal structure shielding layer, and 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 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. Traditionally, it is 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 effect 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 feed-through device with a plurality of stacked first electromagnetic shielding layers, so that the electromagnetic waves passing through the first electromagnetic shielding layer of the first layer will be partially absorbed or guided out by the first electromagnetic shielding layer behind after the reflection, diffraction and other processes, or reflected or diffracted and absorbed or guided out by the previous first electromagnetic shielding layer again, or continue to be reflected or diffracted by the previous first electromagnetic shielding layer and absorbed or guided out by the current first electromagnetic shielding layer, and so on. At this time, the amount of electromagnetic waves passing through the current first electromagnetic shielding layer is greatly 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 for the accumulation of electromagnetic waves to reach a level that affects the pulse emission frequency, thereby prolonging the service life.

[0010] In an exemplary embodiment, the first electromagnetic shielding layer is a metal foil with 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 the electromagnetic wave is completely reflected or absorbed when it contacts the second area.

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

[0012] The first electromagnetic shielding layer is a sheet metal structure, the area where the through hole is located is the first area, and the other areas except the first area are the second area. Since the second area is dense, the electromagnetic wave is reflected or absorbed as much as possible when it contacts the second area. By making the above 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 one first gap, and the feedthrough pin has at least one first annular protrusion on the periphery, and 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 covers the orthographic projection of the first gap adjacent thereto, that is, when the angle of some electromagnetic waves passing through a first gap is directly toward the adjacent first gap, each first annular protrusion is on the path of these electromagnetic waves. Thus, after passing through a first gap, all electromagnetic waves cannot pass through subsequent first gaps without reflection, refraction or diffraction of the first electromagnetic shielding layer.

[0014] In an exemplary embodiment, the width of the first gap is the minimum dielectric distance from the feed-through pin to the first electromagnetic shielding layer, so as to reduce the amount of electromagnetic waves passing through the first gap as much as possible.

[0015] In an exemplary embodiment, the feedthrough pin has two second annular protrusions at both ends. The two second annular protrusions serve as 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 covers the orthographic projection of the first gap adjacent thereto, that is, before the electromagnetic wave contacts the first electromagnetic shielding layer of the feedthrough device, the second annular protrusion can provide a certain degree of shielding for the electromagnetic wave.

[0016] We know that in the first direction, electromagnetic waves in space are not blocked in any form before entering the first gaps at both ends, and the angle range of electromagnetic waves entering the first gaps by direct radiation is relatively large. By providing second annular protrusions, and making the orthographic projection of each second annular protrusion cover the orthographic projection of the first gap adjacent to it on the projection plane perpendicular to the first direction, electromagnetic waves coming directly from the space are reduced.

[0017] In an exemplary embodiment, a second electromagnetic shielding layer is embedded in each of 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 a 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. In other words, the second annular protrusion can be used to further enhance the electromagnetic shielding of the feed-through device.

[0018] In an 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. Since the second electromagnetic shielding layer is located on the surface of the feedthrough device, which is equivalent to partially exposing it to the air, compared to the second electromagnetic shielding layer, the first electromagnetic shielding layer and the feedthrough pin are only insulated feedthrough device main body materials, while the second electromagnetic shielding layer and the feedthrough device main body materials 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 the width of the second gap is set 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 makes the first gap between the first electromagnetic shielding layer and the first annular protrusion away from the main body of the feedthrough device, and then after the electromagnetic wave is reflected by the main body of the feedthrough device, the angle range that can directly enter and pass through the first gap away from the main body of the feedthrough device will be smaller than the angle range that the electromagnetic wave can directly enter and pass through the first gap adjacent to the main body of the feedthrough device after being reflected by the main body of the feedthrough device, so that the amount of electromagnetic waves that can pass through the first gap after being reflected by the main body of the feedthrough device is further reduced.

[0021] In a second aspect, the present disclosure further provides a pulse generator, which includes a shell, a main control board and a feedthrough device as in the first aspect, 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 tissues via 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 comprises a stimulation electrode and a 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 (members 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 provided for one embodiment of the present disclosure.

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

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

[0029] Figure 4 A cross-sectional schematic diagram of an exemplary feed-through device provided 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 cross-sectional schematic diagram of an exemplary feed-through device provided for another embodiment of the present disclosure.

[0032] Figure 7 A cross-sectional schematic diagram of an exemplary feed-through device provided for yet another embodiment of the present disclosure.

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

[0034] Fig.9A The diagram shows the incident angle of an electromagnetic wave under one condition.

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

[0036] Fig.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 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 described embodiments 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 through a plurality of wires, and the electrical signal from the pulse generator 20 delivers an electromagnetic pulse to a target to be stimulated in the patient's body via the stimulation electrode 10, 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, 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, in which a stimulation electrode 10 is inserted, and a main control board 25 is located in the housing of the pulse generator 20. The upper housing 21 and the lower housing 22 are sealed by the feedthrough device 23 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 interference of external electromagnetic waves on the main control board.

[0041] In an exemplary embodiment, if Figure 2-Figure 4 As shown, the feedthrough device 23 includes a main body 231, at least one feedthrough pin 232, and a plurality of first electromagnetic shielding layers 233 stacked and spaced along a first direction, each feedthrough pin 232 passes through a plurality of first electromagnetic shielding layers 233 along the first direction, that is, each feedthrough pin 232 passes through all the first electromagnetic shielding layers 233 along the first direction. The feedthrough pin 232 is used to electrically connect the main control board 25 and the stimulation electrode 10. The first electromagnetic shielding layer 233 is integrally formed in the main body 231, and the plurality of first electromagnetic shielding layers 233 are arranged at intervals from each other, each first electromagnetic shielding layer 233 has at least one through hole 2331, and different first electromagnetic shielding layers 233 are provided with the same number of through holes 2331. Each feedthrough pin 232 passes through a through hole 2331 in each first electromagnetic shielding layer 233 along the first direction, and the feedthrough pin 232 is electrically isolated from any 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 through a wire 30 to achieve the connection between the stimulation electrode 10 and the main control board 25. To avoid mixing of pulse signals, different wires 30 are electrically isolated from each other, and 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. There is a gap between the through hole 2331 and the feedthrough pin 232 to allow electromagnetic waves to pass.

[0043] like Figure 5 As shown, the present disclosure provides a feed-through device having a plurality of stacked first electromagnetic shielding layers 233, so that the electromagnetic waves passing through the first first electromagnetic shielding layer 233 will be partially absorbed, guided out and / or reflected, diffracted by the second first electromagnetic shielding layer 233 after reflection, diffraction and other processes, and will be absorbed or guided out by the first first electromagnetic shielding layer 233 again and / or continue to be reflected or diffracted by the first first electromagnetic shielding layer 233 and absorbed or guided out by the second first electromagnetic shielding layer 233, and so on. At this time, the amount of electromagnetic waves passing through the second first electromagnetic shielding layer 233 is greatly reduced compared to the amount of electromagnetic waves passing through the first first electromagnetic shielding layer 233. When there are more than two layers of 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 in the figure are only exemplary, and their wavelength, width, etc. are only used to schematically explain the change in the amount after reflection and diffraction of 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 prolonging the service life.

[0045] In some embodiments, the first electromagnetic shielding layer is connected to a power source of the pulse generator through a wire. When the power is on, if the electromagnetic wave contacts the first electromagnetic shielding layer in the powered state, a part of it will be converted into heat energy and absorbed by the first electromagnetic shielding layer. The electric field generated by the powered first electromagnetic shielding layer will cause the electromagnetic wave to reflect, refract, scatter, etc., so that the possibility of the electromagnetic wave passing through the first electromagnetic shielding layer is further reduced.

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

[0047] In an exemplary embodiment, if Figure 3 As shown, the first electromagnetic shielding layer 233 is a metal foil provided with at least one through hole 2331. That is, the area of ​​the electromagnetic shielding layer 233 not occupied by the through hole 2331 is dense, rather than a grid structure, so that when the first electromagnetic shielding layer 233 is energized, the electromagnetic wave is completely reflected or absorbed when it contacts the second area.

[0048] Traditional electromagnetic shielding layers are mostly mesh structures, which can usually shield electromagnetic waves of most wavelengths, but electromagnetic waves of some frequencies can still pass through the mesh holes and pass through the electromagnetic shielding device to interfere with the pulse excitation process of the main control board, resulting in the inability to emit pulses to the target area of ​​the human body at a predetermined frequency. This embodiment can further extend the service life of the pulse generator 20 by making the above-mentioned 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, and the feedthrough pin 232 has at least one first annular protrusion 234 on the periphery, and the first annular protrusion 234 is configured to absorb or reflect electromagnetic waves in space, wherein, on the projection plane perpendicular to the first direction, the orthographic projection of each first annular protrusion 234 covers the orthographic projection of the first gap adjacent thereto, that is, when the angle of some electromagnetic waves passing through a first gap G1 is directly toward the adjacent first gap G1, each first annular protrusion 234 is on the travel path of these electromagnetic waves. As a result, after passing through a first gap G1, all electromagnetic waves cannot pass through the subsequent first gap G1 without the reflection, refraction or diffraction of the first electromagnetic shielding layer 233.

[0050] Exemplarily, 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 arranged alternately with at least one first electromagnetic shielding layer 233 in the first direction.

[0051] In an exemplary embodiment, if Figure 7 As shown, one of the at least one first annular protrusion 234 is flush with a corresponding first electromagnetic shielding layer 233. At least one first annular protrusion 234 is set 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 far away from the main body 2321 of the feed-through device 23, and then the angle range W of the electromagnetic wave that can directly enter and pass through the first gap G1 far 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 2321 of the feed-through device 23, so that the amount of electromagnetic waves that can pass through the first gap G1 far 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 is further reduced. The reflection mode of the electromagnetic wave can refer to Figure 6 The embodiment shown.

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

[0053] In an exemplary embodiment, if Figure 8 As shown, the feedthrough pin 232 has two second annular protrusions 235 at both ends. The two second annular protrusions 235 serve as pads for receiving wires connected to the pads of the stimulation electrode and the main control board, respectively. On the projection plane perpendicular to the first direction, the orthographic projection of each second annular protrusion 235 covers the orthographic projection of the first gap G1 adjacent thereto, that is, before the electromagnetic wave contacts the first electromagnetic shielding layer 233 of the feedthrough device 23, the second annular protrusion 235 can provide a certain degree of shielding for the electromagnetic wave.

[0054] like Fig.9A As shown, the first gap G1 can accept the angle of electromagnetic waves directly incident. In the first direction, electromagnetic waves in the space are not blocked in any form before entering the first gaps G1 at both ends, and the angle α of electromagnetic waves entering the first gap G1 by direct radiation is relatively large.

[0055] like Fig. 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 the 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, if Figure 8 As shown, two opposite surfaces of the main body 231 in the first direction are each embedded with a second electromagnetic shielding layer 236, each second electromagnetic shielding layer 236 is flush with a second annular protrusion 235 in the first direction, and a second gap G2 is separated from the second electromagnetic shielding layer 236 and the second annular protrusion 235. On the projection plane perpendicular to the first direction, the orthographic projection of the first electromagnetic shielding layer 233 covers the orthographic projection of the second gap G2 adjacent to it. In this way, the second annular protrusion can be used to further enhance the electromagnetic shielding property of the feed-through device.

[0057] In an exemplary embodiment, if Fig.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. Since the second electromagnetic shielding layer 236 is located on the surface of the feedthrough device, which is equivalent to partially exposing it to the air, compared with the second electromagnetic shielding layer 236, the first electromagnetic shielding layer 233 and the feedthrough pin 232 are only the insulated feedthrough device body 231 material, and the second electromagnetic shielding layer 236 and the feedthrough device body 231 material also include a part 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. The present disclosure sets the width of the second gap G2 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 reduce the amount of electromagnetic waves passing through the second gap G2 as much as possible.

[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, ie, “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 is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be thought of by any technician familiar with the technical field within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A feedthrough device, applied to a pulse generator of an electrical stimulation system, the electrical stimulation system comprising the pulse generator and a stimulation electrode, the pulse generator comprising a shell for accommodating a main control board, the main control board being used to generate stimulation pulses, the stimulation pulses being transmitted to the stimulation electrode and delivered to the patient's tissue via the stimulation electrode, the shell shielding electromagnetic waves, the shell being provided with a feedthrough hole, the feedthrough device blocking the feedthrough hole, characterized in that: The feed-through device comprises: main body; at least one feed-through 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 along the 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.

2. The feed-through device according to claim 1, characterized in that Each first electromagnetic shielding layer has at least one through hole, each feed-through pin passes through a through hole in each first electromagnetic shielding layer along the first direction, and 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, characterized in that: Each first electromagnetic shielding layer is separated from the feed-through pin by at least a first gap, and the feed-through pin has at least one first annular protrusion on the periphery, and the first annular protrusion 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 covers the orthographic projection of the first gap adjacent to it in the first direction.

4. The feed-through device according to claim 3, characterized in that: The width of the first gap is the minimum dielectric distance from the feed-through pin to the first electromagnetic shielding layer.

5. The feed-through device according to claim 4, characterized in that: The feed-through 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.

6. The feed-through device according to claim 5, 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.

7. The feed-through device according to claim 6, 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.

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

9. The feed-through device according to claim 3, characterized in that: One of the at least one first annular protrusion is flush with a corresponding first electromagnetic shielding layer.

10. A pulse generator, comprising a shell, a main control board and a feedthrough device as described in any one of claims 1 to 9, 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 tissues via 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.

11. A stimulation system comprising a stimulation electrode and the pulse generator according to claim 10.

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