CN219681482U - Sealing plug and implantable medical device adopting same - Google Patents

Abstract

The utility model provides a sealing plug and an implantable medical device using the sealing plug, wherein the sealing plug is an insulating elastic piece, and at least part of the sealing plug is used for being plugged into a screw channel of the implantable medical device; the sealing plug comprises a body and a gradient boss arranged along the periphery of the body, wherein the gradient boss is provided with a large end and a small end along the axial direction of the body, the large end and the small end are both used for being plugged into the screw channel, and the diameter of the small end is larger than the inner diameter of the screw channel. When the sealing plug is screwed into the screw channel, the gradient lug boss expands the screw channel to cause the gradient lug boss of the sealing plug to generate gradient elastic deformation, so that the gradient lug boss generates gradient pretightening force on the screw channel, the pretightening force at the small end is smaller, and the installation of the sealing plug is facilitated; the pretightening force at the large end is large, so that a better sealing effect is achieved, and body fluid is prevented from penetrating; and the big end to the small end of the gradient boss are clamped at the corresponding screw channel positions, and the sealing plug can be effectively prevented from falling off.

Description

Sealing plug and implantable medical device adopting same

Technical Field

The utility model belongs to the technical field of miniature medical instruments, and particularly relates to a sealing plug and an implantable medical device adopting the sealing plug.

Background

Currently, an implanted medical device is an electronic therapeutic apparatus implanted in a body, and an electric pulse supplied by a battery is emitted through a pulse generator, and the affected part or tissue contacted by an electrode is stimulated through the conduction of an extension lead, thereby achieving the purpose of treating dysfunction. The implantable medical device is widely applied to treating diseases of heart systems, nervous systems and the like, and comprises an implantable heart electric stimulation system (commonly called a cardiac pacemaker), deep brain electric stimulation, implantable brain cortex stimulation, implantable spinal cord electric stimulation, implantable sacral nerve electric stimulation, implantable vagus nerve electric stimulation, an implantable drug infusion system and the like.

The good sealing of the implantable medical device is guaranteed by the function, if the sealing system of the implantable cardiac pacemaker is unreliable, body fluid can permeate into the implantable cardiac pacemaker, transmission of pacing signals can be directly affected, and serious short circuits of the positive electrode and the negative electrode of a circuit can be caused, so that normal use of the pacemaker is affected or the service life of a battery is shortened.

When the existing implantable nerve stimulator or cardiac pacemaker is used, one end of an extension lead is usually inserted into a connector of the implantable nerve stimulator or cardiac pacemaker, then a set screw is inserted into the connector through a screw channel on the connector and is connected with the extension lead, in order to ensure the tightness of the connector, a sealing plug is usually arranged in the screw channel at the top of the set screw, and in the assembly process, a torque wrench penetrates through the sealing plug to the set screw and rotates the set screw to lock, and then the torque wrench is pulled out.

However, the sealing between the sealing plug and the torque wrench and between the sealing plug and the screw channel is not tight, so that body fluid is easy to enter the connector to form a short circuit, and normal use of the implanted medical device is affected.

Disclosure of Invention

The embodiment of the utility model provides a sealing plug and an implantable medical device adopting the sealing plug, which solve the problems that the sealing between the sealing plug and a torque wrench and between the sealing plug and a screw channel is not tight, body fluid is easy to enter a connector to form short circuit, and the normal use of the implantable medical device is affected.

In a first aspect, the present embodiment provides a sealing plug for an implantable medical device, the sealing plug being an insulating elastic member, and at least a portion of the sealing plug being for insertion into a screw channel of the implantable medical device;

the sealing plug comprises a body and a gradient boss arranged along the periphery of the body, wherein the gradient boss is provided with a large end and a small end along the axial direction of the body, the large end and the small end are both used for being plugged into the screw channel, and the diameter of the small end is larger than the inner diameter of the screw channel.

In one possible implementation, the diameter of the gradient boss gradually decreases along the screwing direction of the body.

In one possible implementation, the gradient boss is disposed in the middle of the axial circumferential side of the body.

In one possible implementation, a section of counter bore is formed on the end face of the screwing end of the body towards the inside of the body in a recessed way, the diameter of the counter bore is larger than the outer diameter of the set screw, and the counter bore is used for accommodating one end of the set screw.

In one possible implementation mode, the screwing end of the body is provided with a guide boss, the end face of the screwing end of the body is connected with one end of the guide boss, the guide boss is provided with a large end and a small end along the screwing direction of the body, the large end of the guide boss is connected with the screwing end of the body, and the small end of the guide boss is close to the set screw.

In one possible implementation, a slot is provided in the body along the direction of screwing in the body, the slot penetrating the body so that one end of the torque wrench passes through the slot and screws the set screw, the width of the slot being adapted to the width of the insertion portion of the torque wrench.

In one possible implementation, a recess is formed in the end surface of the body away from the screwing end and recessed into the body, the recess being in communication with the slot, the recess being for guiding the torque wrench.

In one possible implementation, at least part of the end surface of the body facing away from the screw-in end is provided with an arcuate surface to provide a smooth transition between the sealing plug and the shape of the top of the connector of the implantable medical device.

In a second aspect, the present embodiment provides an implantable medical device comprising a connector, a set screw, and a sealing plug as described above;

the top of the connector is provided with a screw channel, a set screw is arranged in the inner cavity of the connector through the screw channel, and at least part of the sealing plug is plugged into the screw channel.

In one possible implementation, the connector further comprises an extension wire, one end of the extension wire extends into the connector, a connector is arranged in the connector, and one end of the extension wire is connected with the set screw in the inner cavity of the connector through the connector.

The embodiment of the utility model provides a sealing plug and an implantable medical device adopting the sealing plug, wherein the sealing plug is an insulating elastic piece, at least part of the sealing plug is used for being plugged into a screw channel of the implantable medical device, and the part of the sealing plug plugged into the screw channel of the implantable medical device can generate elastic deformation so as to generate elasticity or pretightening force; the sealing plug comprises a body and a gradient boss arranged along the peripheral side of the body, the gradient boss is provided with a large end and a small end along the axial direction of the body, the large end and the small end are both used for being plugged into the screw channel, the diameter of the small end is larger than the inner diameter of the screw channel, when the sealing plug is screwed into the screw channel, the gradient boss expands the screw channel to cause the gradient boss of the sealing plug to generate gradient elastic deformation, so that the gradient boss generates gradient pretightening force on the screw channel, and the pretightening force at the small end is smaller, thereby being beneficial to the installation of the sealing plug; the pretightening force at the large end is large, so that a better sealing effect is achieved, and body fluid is prevented from penetrating; and the big end to the small end of the gradient boss are clamped at the corresponding screw channel positions, and the sealing plug can be effectively prevented from falling off.

Drawings

FIG. 1 is a schematic illustration of a structure at a sealing plug of an implantable medical device according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1;

fig. 3 is a schematic structural view of a sealing plug according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view taken along the direction B-B in FIG. 3;

fig. 5 is a cross-sectional view of a sealing plug provided by another embodiment of the present utility model.

Reference numerals illustrate:

100-sealing plug; a 200-connector; 300-extending the wire; 400-set screw; 500-linker; 600-moment wrench;

110-body; 120-gradient boss; 130-slit; 140-counter bore; 150-grooves; 160-guiding boss.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

In the description of embodiments of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be a mechanical connection; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Fig. 1 is a schematic view of a structure of a sealing plug of an implantable medical device according to an embodiment of the present utility model. Fig. 2 is a cross-sectional view taken along A-A in fig. 1. Referring to fig. 1 and 2, an embodiment of the present utility model provides an implantable medical device including a connector 200, a set screw 400, and a sealing plug 100; the connector 200 is provided with a screw channel which is communicated with the inner cavity of the connector 200, the set screw 400 is installed in the inner cavity of the connector 200 through the screw channel, and at least part of the sealing plug 100 is plugged into the screw channel.

In some examples, the connector 200 has at least one screw channel and a mating sealing plug 100. Wherein the screw channel may be located at the top or side of the connector 200. The connector 200 may be made of epoxy, thermoplastic polyurethane, or silicone rubber.

In some examples, the implantable medical device further includes an extension lead 300, one end of the extension lead 300 extending into the connector 200, one end of the extension lead 300 being coupled with a set screw 400 in the lumen of the connector 200.

In some examples, connector 200 has a connector 500 disposed therein, and one end of extension wire 300 is connected to set screw 400 by connector 500.

By arranging the connector 500 in the embodiment of the utility model, the connection between the extension wire 300 and the set screw 400 can be more stable.

In the embodiment of the utility model, the portion of the sealing plug 100 plugged into the screw channel of the implantable medical device can be elastically deformed, so that elastic force or pretightening force is generated between the sealing plug 100 and the screw channel, and the sealing of the sealing plug 100 to the connector 200 is realized. The sealing plug 100 may be screwed into the screw channel entirely or partially to achieve the sealing effect.

When the implantable nerve stimulator or the cardiac pacemaker is used, one end of an extension lead is usually inserted into a connector of the implantable nerve stimulator or the cardiac pacemaker, then a set screw is inserted into the connector through a screw channel on the connector and is connected with the extension lead, a sealing plug is usually arranged in the screw channel at the top of the set screw in order to ensure the tightness of the connector, and in the assembly process, a torque wrench penetrates through the sealing plug to the set screw and rotates the set screw to lock, and then the torque wrench is pulled out.

In general, most sealing plugs are equal-diameter cylindrical sealing plugs, the diameter is a single value, and the obtained elastic force/pretightening force is also a single value when a screw channel or a torque wrench is inserted, so that the sealing plugs are not easy to install when the diameter of the equal-diameter cylindrical sealing plugs is larger, the elastic force/pretightening force generated when the diameter is smaller, the sealing plug and the torque wrench and the sealing plug and the screw channel are sealed, body fluid is easy to enter the connector to form a short circuit, and the normal use of the implanted medical device is influenced.

Therefore, the embodiment of the utility model provides a sealing plug, which is an insulating elastic piece, at least part of the sealing plug is used for being plugged into a screw channel of an implantable medical device, and the part of the sealing plug plugged into the screw channel of the implantable medical device can generate elastic deformation so as to generate elastic force or pretightening force; the sealing plug comprises a body and a gradient boss arranged along the peripheral side of the body, the gradient boss is provided with a large end and a small end along the axial direction of the body, the large end and the small end are both used for being plugged into the screw channel, the diameter of the small end is larger than the inner diameter of the screw channel, when the sealing plug is screwed into the screw channel, the gradient boss expands the screw channel to cause the gradient boss of the sealing plug to generate gradient elastic deformation, so that the gradient boss generates gradient pretightening force on the screw channel, and the pretightening force at the small end is smaller, thereby being beneficial to the installation of the sealing plug; the pretightening force at the large end is large, so that a better sealing effect is achieved, and body fluid is prevented from penetrating; and the big end of this gradient boss to tip card in the screw passageway position that corresponds, can also prevent effectively that the sealing plug from deviate from, and it is not tight to solve between above-mentioned sealing plug and the moment spanner and seal between sealing plug and the screw passageway, makes body fluid get into the connector easily and forms the short circuit, influences the problem of the normal use of implanted medical device.

The specific structure of the sealing plug provided by the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

Fig. 3 is a schematic structural view of a sealing plug according to an embodiment of the present utility model. Fig. 4 is a sectional view taken along the direction B-B in fig. 3. Referring to fig. 3 and 4, in one aspect, the present utility model provides a sealing plug for an implantable medical device, the sealing plug 100 being an insulating elastic member, and at least a portion of the sealing plug 100 being for insertion into a screw channel of the implantable medical device. The sealing plug 100 comprises a body 110 and a gradient boss 120 arranged along the circumferential side of the body 110, wherein the gradient boss 120 is provided with a large end and a small end along the axial direction of the body 110, the large end and the small end are both used for being plugged into a screw channel, and the diameter of the small end is larger than the inner diameter of the screw channel.

Illustratively, the material from which the sealing plug 100 is made is silicone rubber or thermoplastic polyurethane, and the body 110 of the sealing plug 100 is cylindrical.

It will be appreciated that the large end refers to the end of the gradient lobes 120 that is larger in diameter and the small end refers to the end of the gradient lobes 120 that is smaller in diameter. The diameter of the small end is larger than the inner diameter of the screw channel, so that when the sealing plug 100 is plugged into the screw channel, elastic force/pretightening force can be generated between the whole gradient boss 120 and the screw channel, and the sealing plug 100 is beneficial to improving the sealing performance.

In the embodiment of the utility model, the sealing plug 100 is an insulating elastic piece, and the part of the sealing plug 100 plugged into the screw channel of the implantable medical device can generate elastic deformation, so that elastic force or pretightening force is generated between the sealing plug 100 and the screw channel; when the sealing plug 100 is screwed into the screw channel, the gradient boss 120 expands the screw channel, so that the gradient boss 120 of the sealing plug 100 generates gradient elastic deformation, and further the gradient boss 120 generates gradient pretightening force on the screw channel, the elastic deformation at the small end is smaller, the generated pretightening force is smaller, and the installation is facilitated; the elastic deformation at the large end is larger, the generated pretightening force is larger, the better sealing effect is achieved, and the penetration of body fluid is prevented; and the big end to the small end of the gradient boss 120 are clamped at the corresponding screw channel positions, so that the sealing plug 100 can be effectively prevented from falling out.

With continued reference to fig. 2 and 3, in some examples, the diameter of the gradient boss 120 gradually decreases along the screwing direction of the body 110 (as shown in the Z direction in fig. 2), that is, the gradient boss 120 is a gradient boss 120 with a diameter gradually changing along the screwing direction, and an inclined structure is formed on the circumference of the axis of the gradient boss 120, where the diameters of the large end and the small end can be changed as required to obtain different inclined angles, so that the sealing plug 100 is convenient to install and has good tightness.

In other examples, the diameter of the gradient boss 120 gradually increases and then gradually decreases in the screwing direction of the body 110, that is, the diameter of both ends of the gradient boss 120 in the axial direction is smaller than that of the middle portion, it being understood that in this example, the large end refers to the middle portion of the large diameter and the small end refers to both ends of the gradient boss 120 in the axial direction.

In some examples, the diameter of the gradient boss 120 gradually increases along the screwing direction of the body 110, i.e., the end of the gradient boss 120 near the screwing end of the body 110 is a large end, and the end far from the screwing end of the body 110 is a small end.

Fig. 5 is a cross-sectional view of a sealing plug provided by another embodiment of the present utility model. Referring to fig. 5, in some examples, the diameter of the gradient boss 120 is gradually increased along the screwing direction of the body 110, then gradually decreased, and then gradually increased, that is, two sides of the cross section of the gradient boss 120 along the axial direction are S-shaped.

In the embodiment of the utility model, the diameter of the gradient boss 120 gradually decreases along the screwing direction of the body 110, and the gradient boss can be installed by directly pressing when the sealing plug 100 is plugged into a screw channel, so that the sealing plug 100 can be conveniently plugged into the screw channel without using a tool, the production efficiency is improved, and the cost is reduced.

In some examples, the gradient boss 120 is disposed at a middle portion of an axial circumferential side of the body 110, wherein the middle portion may be understood as a center line of the gradient boss 120 in an axial direction coincides with a center line of the body 110 in the axial direction, and both ends of the gradient boss 120 in a screwing direction have a space between them.

In some examples, the gradient boss 120 is disposed at a lower portion of an axial circumferential side of the body 110, wherein the lower portion may be understood as that a center line of the gradient boss 120 in an axial direction coincides with a center line of the body 110 in the axial direction, and an end surface of one end of the gradient boss 120 in a screwing direction is in the same plane as an end surface of a screwing end of the body 110.

In some examples, the axial center line of the gradient boss 120 coincides with the axial center line of the body 110, and the end surface of one end of the gradient boss 120 in the screwing direction is in the same plane as the end surface of the screwing end of the body 110, and the end surface of the other end of the gradient boss 120 in the screwing direction is in the same plane as the end surface of the body 110 facing away from the screwing end.

In the embodiment of the utility model, the gradient boss 120 is arranged in the middle of the axial peripheral side of the body 110, so that the whole sealing plug 100 can be stressed more uniformly when the sealing plug 100 is plugged in and the moment spanner 600 is inserted in.

With continued reference to FIG. 4, in some examples, a section of counterbore 140 is recessed toward the interior of the body 110 on the end face of the threaded end of the body 110, the counterbore 140 having a diameter greater than the outer diameter of the set screw 400. The screwed-in end is understood to mean that the sealing plug 100 first enters one end of the screw channel when the sealing plug 100 is plugged into the screw channel.

In the embodiment of the present utility model, the counterbore 140 is used to receive one end of the set screw 400, so as to prevent the sealing plug 100 from pressing the set screw 400 and the one end of the set screw 400 rotating, thereby damaging the sealing plug 100 when the set screw 400 is tightened by the torque wrench 600.

In some examples, the screwing end of the body 110 is provided with a guide boss 160, an end surface of the screwing end of the body 110 is connected with one end of the guide boss 160, the guide boss 160 has a large end and a small end along the screwing direction of the body 110, the large end of the guide boss 160 is connected with the screwing end of the body 110, the large end of the guide boss 160 has the same diameter as the body 110, and the small end of the guide boss 160 is disposed close to the set screw 400.

In the embodiment of the present utility model, the guiding boss 160 is disposed at the screwing end of the body 110, and the inclined structure between the large end and the small end of the guiding boss 160 can play a guiding role when the sealing plug 100 is plugged into the screw channel.

In some examples, the body 110 is internally provided with a slit 130 along the screwing direction of the body 110, the slit 130 penetrates the body 110, and the slit 130 can enable the torque wrench 600 to insert, extract, rotate and tighten the set screw 400, and recover after the torque wrench 600 is extracted. In use, one end of torque wrench 600 passes through slot 130 and tightens set screw 400, with the width of slot 130 corresponding to the width of the insert of torque wrench 600.

In the embodiment of the present utility model, the width of the slit 130 is adapted to the width of the insertion portion of the torque wrench 600, so that the body 110 at the slit 130 is tightly fitted to the insertion portion of the torque wrench 600. When the torque wrench 600 is inserted into the gap 130, a fine passage is formed at two sides of the torque wrench 600, body fluid enters along the passage, after the sealing plug 100 is arranged in the screw passage through the arrangement of the gradient boss 120, the gradient boss 120 is elastically deformed again when the torque wrench 600 is inserted, and then gradient gradual clamping force is generated, so that better wrapping of the torque wrench 600 is formed, namely gradient wrapping clamping force is generated on the torque wrench 600, the generation of the fine passage formed at two sides of the torque wrench 600 is better avoided, the sealing effect of better sealing the torque wrench 600 and the gap 130 is achieved, and body fluid infiltration is prevented.

With continued reference to fig. 4, in some examples, the end surface of the body 110 distal from the threaded end is recessed into the body 110 to form a recess 150, the recess 150 being in communication with the slot 130.

By arranging the groove 150 in the embodiment of the utility model, the moment wrench 600 can be guided when the moment wrench 600 extends into the gap 130, and the moment wrench 600 can be guided to reach the gap 130 of the sealing plug 100.

In some examples, at least a portion of the end of the body 110 facing away from the threaded end is curved, i.e., the end of the body 110 that engages the surface of the connector 200 after the plug 100 is inserted into the screw channel on the connector 200.

In the embodiment of the utility model, at least part of the end surface of the body 110, which is opposite to the screwing end, is provided with an arc-shaped surface, so that the shape of the top of the connector 200 of the implanted medical device and the sealing plug 100 can be smoothly transited, and the purpose of unification and beauty of the whole body can be achieved.

Another aspect of the utility model provides an implantable medical device comprising a connector 200, a set screw 400 and a sealing plug 100 according to any of the above embodiments, at least part of the sealing plug 100 being plugged into the screw channel. The implantable medical device includes all of the benefits described above and is not described in detail herein.

When the gradient lug boss 120 is used, one end of the extension lead 300 extends into the connector 200, the set screw 400 enters the connector 200 from a screw channel on the connector 200, then the sealing plug 100 is plugged into the screw channel along the screwing direction, and when the sealing plug 100 is screwed into the screw channel, the gradient lug boss 120 expands the screw channel to cause the gradient lug boss 120 of the sealing plug 100 to generate gradient elastic deformation, so that the gradient lug boss 120 generates gradient pretightening force on the screw channel. Finally, one end of the torque wrench 600 is used for tightening the set screw 400 through the gap 130, when the torque wrench 600 is inserted into the gap 130, a fine passage is formed at two sides of the torque wrench 600, body fluid enters along the passage, after the sealing plug 100 is put into a screw passage through the arrangement of the gradient boss 120, the gradient boss 120 is elastically deformed again when the torque wrench 600 is inserted, and then gradient gradual clamping force is generated, so that better wrapping of the torque wrench 600 is formed, namely gradient wrapping clamping force is generated on the torque wrench 600, the generation of fine passages formed at two sides of the torque wrench 600 is better avoided, the sealing effect of better sealing the torque wrench 600 and the gap 130 is achieved, and body fluid infiltration is prevented. After tightening the set screw 400, the torque wrench 600 is pulled out along the slit 130.

The reader will appreciate that in the description of this specification, a description of reference to the terms "one embodiment," "some embodiments," "in some examples," "specific examples," or "some examples," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The foregoing detailed description of the embodiments of the present utility model further illustrates the purposes, technical solutions and advantageous effects of the embodiments of the present utility model, and it should be understood that the foregoing is merely a specific implementation of the embodiments of the present utility model, and is not intended to limit the scope of the embodiments of the present utility model, and any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present utility model should be included in the scope of the embodiments of the present utility model.

Claims (10)

1. A sealing plug for an implantable medical device, characterized in that the sealing plug (100) is an insulating elastic member and at least part of the sealing plug (100) is intended to be plugged into a screw channel of the implantable medical device;

the sealing plug (100) comprises a body (110) and a gradient boss (120) arranged along the periphery of the body (110), the gradient boss (120) is provided with a large end and a small end along the axial direction of the body (110), the large end and the small end are both used for being plugged into the screw channel, and the diameter of the small end is larger than the inner diameter of the screw channel.

2. A sealing plug according to claim 1, characterized in that the diameter of the gradient bead (120) decreases gradually in the screwing direction of the body (110).

3. A sealing plug according to claim 1, characterized in that the gradient boss (120) is arranged in the middle of the axial circumference of the body (110).

4. A sealing plug according to any one of claims 1-3, characterized in that a section of counterbore (140) is recessed towards the interior of the body (110) on the end face of the threaded end of the body (110), the counterbore (140) having a diameter larger than the outer diameter of the set screw (400), the counterbore (140) being adapted to receive one end of the set screw (400).

5. A sealing plug according to any one of claims 1-3, characterized in that the screwing-in end of the body (110) is provided with a guiding boss (160), the end surface of the screwing-in end of the body (110) is connected with one end of the guiding boss (160), the guiding boss (160) has a large end and a small end along the screwing-in direction of the body (110), the large end of the guiding boss (160) is connected with the screwing-in end of the body (110), and the small end of the guiding boss (160) is arranged close to the set screw (400).

6. A sealing plug according to any one of claims 1-3, characterized in that the body (110) is internally provided with a slit (130) arranged in the direction of screwing in the body (110), the slit (130) extending through the body (110) such that one end of a torque wrench (600) extends through the slit (130) and the tightening screw (400) is screwed, the width of the slit (130) being adapted to the width of the insertion part of the torque wrench (600).

7. A sealing plug according to claim 6, characterized in that the end surface of the body (110) facing away from the screw-in end is recessed into the body (110) to form a recess (150), the recess (150) being in communication with the slit (130), the recess (150) being adapted to guide a torque wrench (600).

8. A sealing plug according to any of claims 1-3, characterized in that at least part of the end surface of the body (110) facing away from the screw-in end is provided with an arcuate surface to smooth the transition of the sealing plug (100) to the shape of the top of the connector (200) of the implantable medical device.

9. An implantable medical device comprising a connector (200), a set screw (400) and a sealing plug according to any of claims 1-8;

the top of the connector (200) is provided with a screw channel, the set screw (400) is installed in the inner cavity of the connector (200) through the screw channel, and at least part of the sealing plug (100) is plugged into the screw channel.

10. The implantable medical device according to claim 9, further comprising an extension lead (300), wherein one end of the extension lead (300) extends into the connector (200), wherein a connector (500) is provided in the connector (200), and wherein one end of the extension lead (300) is connected to the set screw (400) in the lumen of the connector (200) via the connector (500).