CN112826581A

CN112826581A - Holding and taking device and self-breaking screw plug assembly with same

Info

Publication number: CN112826581A
Application number: CN202110183841.0A
Authority: CN
Inventors: 姚得志; 刘斌; 刘爽; 郭宇辰; 李健
Original assignee: Beijing Libeier Bio Engineering Institute Co Ltd
Current assignee: Beijing Libeier Bio Engineering Institute Co Ltd
Priority date: 2021-02-10
Filing date: 2021-02-10
Publication date: 2021-05-25

Abstract

The invention provides a holding device and a self-breaking screw plug assembly with the same, wherein the holding device comprises: the first rod body comprises a first rod section and a holding section connected with the first rod section, and a first tooth-shaped part is arranged at one end, far away from the holding section, of the first rod section; the second body of rod, including the second profile of tooth portion that connects gradually, second pole section and drive section, the second pole section rotationally wears to locate first pole internally, the one end of section is held away from in first profile of tooth portion to the backstop of second profile of tooth portion, the one end of first profile of tooth portion is kept away from in the section of holding to the drive section backstop, wherein, the drive section drives second profile of tooth portion through the second pole section and rotates, so that second profile of tooth portion have with first profile of tooth portion correspond the dodge position that sets up and with the backstop position of first profile of tooth portion dislocation set. The technical scheme of the application effectively solves the problem that the self-breaking part in the related art is easy to fall off from the plurality of tooth-shaped pieces.

Description

Holding and taking device and self-breaking screw plug assembly with same

Technical Field

The invention relates to the field of medical instruments, in particular to a holding and taking device and a self-breaking screw plug assembly with the same.

Background

The self-breaking screw plug is required to be used for limiting the screwing torque of the screw plug in the spine minimally invasive surgery, and the self-breaking screw plug is required to be held by the holding device after being screwed off, so that the twisted-off part can be effectively held by the holding device, the phenomenon that the twisted-off part falls off into a patient body when a screwdriver is pulled out is avoided, and the surgery time is prolonged.

At present, the existing holding and taking device of the self-breaking screw plug of the minimally invasive surgery comprises the screw plug and a self-breaking part. As shown in fig. 1 to 3, the holding device for the self-breaking screw plug comprises an outer rod 1 and an inner rod 2 inserted into the outer rod 1. The end part of the outer rod 1 is provided with a plurality of toothed sheets 3 arranged at intervals, the end part of the inner rod 2 is provided with a push rod 4, and the push rod 4 pushes the plurality of toothed sheets 3 to deform outwards, so that the plurality of toothed sheets 3 can hold the self-breaking part. After the holding device of the self-breaking screw plug screws the screw plug into the screw seat of the pedicle screw, the self-breaking part is screwed off by force. At this time, the screw plug is separated from the self-breaking portion, but the plurality of tooth pieces are not firmly held by the self-breaking portion, and the self-breaking portion is easily dropped from the plurality of tooth pieces. Because the channel is narrow and long in the minimally invasive surgery, once the self-breaking part falls off, the self-breaking part needs to be taken out in the surgery with time and labor.

Disclosure of Invention

The invention mainly aims to provide a holding device and a self-breaking screw plug assembly with the same, so as to solve the problem that a self-breaking part in the related art is easy to fall off from a plurality of tooth-shaped sheets.

In order to achieve the above object, according to one aspect of the present invention, there is provided a holding device comprising: the first rod body comprises a first rod section and a holding section connected with the first rod section, and a first tooth-shaped part is arranged at one end, far away from the holding section, of the first rod section; the second body of rod, including the second profile of tooth portion that connects gradually, second pole section and drive section, the second pole section rotationally wears to locate first pole internally, the one end of section is held away from in first profile of tooth portion to the backstop of second profile of tooth portion, the one end of first profile of tooth portion is kept away from in the section of holding to the drive section backstop, wherein, the drive section drives second profile of tooth portion through the second pole section and rotates, so that second profile of tooth portion have with first profile of tooth portion correspond the dodge position that sets up and with the backstop position of first profile of tooth portion dislocation set.

Further, the outer profile of the second tooth is the same as the outer profile of the first tooth.

Further, a positioning structure is arranged between the drive section and the first rod section to enable the second toothing to be held in the retracted position and/or in the stop position.

Furthermore, the positioning structure comprises a first positioning hole, a second positioning hole and a positioning piece matched with the first positioning hole and the second positioning hole, one of the driving section and the first rod section is provided with a positioning piece, the other of the driving section and the first rod section is provided with the first positioning hole and the second positioning hole, when the positioning piece is positioned in the first positioning hole, the second tooth-shaped part is positioned at the avoiding position, and when the positioning piece is positioned in the second positioning hole, the second tooth-shaped part is positioned at the stopping position.

Further, the setting element sets up on drive section or the section of gripping, and the setting element includes mounting hole, elastic component and spheroid, and the axis of mounting hole is on a parallel with the axis of the second body of rod, and the elastic component setting is in the mounting hole, and the elastic component applys the elasticity towards first locating hole or second locating hole direction to the spheroid, and the spheroid can keep in first locating hole or second locating hole.

Furthermore, the positioning element further comprises a limiting element connected in the mounting hole, and two ends of the elastic element are respectively abutted against the limiting element and the ball body.

Furthermore, an avoiding mark and a stopping mark are arranged on the outer surface of the driving section, an indicating structure matched with the avoiding mark and the stopping mark is arranged on the outer surface of the holding section, the avoiding mark is arranged corresponding to the first positioning hole, and the stopping mark is arranged corresponding to the second positioning hole.

According to another aspect of the present invention, there is provided a self-breaking screw plug assembly, which includes a self-breaking screw plug and a holding device cooperating with the self-breaking screw plug, wherein the holding device is the above-mentioned holding device.

Furthermore, the self-breaking screw plug is of a cylindrical structure and comprises a screw plug portion, a self-breaking portion and a matching portion which are sequentially connected, the first tooth-shaped portion and the second tooth-shaped portion of the holding device are outer teeth, a third tooth-shaped portion is arranged on the inner wall of the matching portion and is inner teeth matched with the outer teeth, a stopping groove is formed in the inner wall of the self-breaking portion, and when the second tooth-shaped portion of the holding device is located at a stopping position, the second tooth-shaped portion extends into the stopping groove and is matched with the groove wall of the stopping groove in a stopping mode.

Further, the screw plug portion comprises a threaded section, and an axis of the threaded section is parallel to an extending direction of the third tooth-shaped portion.

By applying the technical scheme of the invention, the holding and taking device comprises: the first body of rod and second body of rod. The first rod body comprises a first rod section and a holding section connected with the first rod section. One end of the first rod section, which is far away from the holding section, is provided with a first tooth-shaped part. The second rod body comprises a second tooth-shaped part, a second rod section and a driving section which are sequentially connected. The second rod section is rotatably arranged in the first rod body in a penetrating mode, and the second tooth-shaped portion stops at one end, far away from the holding section, of the first tooth-shaped portion. The driving section is stopped at one end of the holding section, which is far away from the first tooth-shaped part. The driving section drives the second tooth-shaped part to rotate through the second rod section, so that the second tooth-shaped part is provided with an avoiding position corresponding to the first tooth-shaped part and a stopping position staggered with the first tooth-shaped part. When the holding and taking device is used for holding and taking the self-breaking screw plug, the driving section drives the second tooth-shaped part to rotate through the second rod section, so that the second tooth-shaped part is provided with an avoiding position which is correspondingly arranged with the first tooth-shaped part, and the first tooth-shaped part can be matched with the self-breaking part. The driving section is continuously rotated to drive the second tooth-shaped part to rotate through the second rod section, so that the second tooth-shaped part is positioned at a stop position which is staggered with the first tooth-shaped part, and the second tooth-shaped part stops the self-breaking part at the moment, so that the self-breaking screw plug is prevented from falling off from the holding and taking device. After the screw plug is screwed into the screw seat of the pedicle screw, the self-breaking part is forcibly screwed off. At the moment, the screw plug is separated from the self-breaking part, and the self-breaking part cannot fall off from the holding device because the second tooth-shaped part always stops the self-breaking part, so that the self-breaking part is moved out of a human body along with the holding device. Therefore, the technical scheme of the application effectively solves the problem that the self-breaking part in the related art is easy to fall off from the plurality of tooth-shaped sheets.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic cross-sectional view of an embodiment of an outer rod in the related art;

FIG. 2 shows an enlarged partial schematic view of the outer rod of FIG. 1;

figure 3 shows a schematic cross-sectional view of the inner rod of figure 1;

FIG. 4 shows a schematic cross-sectional view of an embodiment of a holding device according to the invention;

FIG. 5 shows an exploded schematic view of an embodiment of a self-breaking plug screw assembly according to the present invention;

FIG. 6 shows a schematic partial cross-sectional view of the second tooth of the self-breaking plug screw assembly of FIG. 5 in an avoidance position;

FIG. 7 shows a schematic partial cross-sectional view of the second tooth of the self-breaking plug screw assembly of FIG. 5 in a misaligned position;

FIG. 8 is an exploded view of the self-breaking plug assembly of FIG. 5 in a twisted-off condition;

FIG. 9 shows a schematic partial structure of the holding device of FIG. 5; and

fig. 10 shows a schematic partial cross-sectional view of the holding device of fig. 9.

Wherein the figures include the following reference numerals:

1. an outer rod; 2. an inner rod; 3. a tooth-shaped sheet; 4. a push rod; 10. a first rod body; 11. a first pole segment; 12. a holding section; 13. a first tooth-shaped portion; 20. a second rod body; 21. a second tooth-shaped portion; 22. a second pole segment; 23. a drive section; 30. a positioning structure; 31. a first positioning hole; 32. a second positioning hole; 33. a positioning member; 331. mounting holes; 332. an elastic member; 333. a sphere; 334. a limiting member; 41. avoiding the mark; 42. a stop mark; 43. an indicating structure; 50. self-breaking screw plugs; 51. a screw plug portion; 511. a threaded segment; 52. a self-breaking portion; 521. a stopper groove; 53. a fitting portion; 531. and a third tooth-shaped part.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 3 to 8, the holding device of the present embodiment includes: a first stick 10 and a second stick 20. The first shaft 10 comprises a first shaft section 11 and a grip section 12 connected to the first shaft section 11. The end of the first rod segment 11 remote from the grip segment 12 is provided with a first tooth-shaped portion 13. The second rod 20 includes a second tooth portion 21, a second rod segment 22 and a driving segment 23 connected in sequence. The second rod section 22 is rotatably disposed through the first rod body 10, and the second tooth portion 21 is stopped at an end of the first tooth portion 13 away from the holding section 12. The driving section 23 is stopped at an end of the holding section 12 away from the first tooth-shaped portion 13. The driving section 23 drives the second tooth-shaped portion 21 to rotate through the second rod section 22, so that the second tooth-shaped portion 21 has an avoidance position corresponding to the first tooth-shaped portion 13 and a stop position offset from the first tooth-shaped portion 13.

By applying the technical solution of the present embodiment, the holding section 12 is convenient to hold and operate. When the driving section 23 rotates, the driving section 23 drives the second rod section 22 to rotate relative to the first rod 10 in the first rod 10. The second tooth-shaped portion 21 stops at an end of the first tooth-shaped portion 13 away from the holding section 12. The driving section 23 is stopped at an end of the holding section 12 away from the first tooth-shaped portion 13. Thus, the second tooth portion 21 and the driving section 23 can limit two ends of the first rod 10, so that the first rod 10 and the second rod 20 are reliably coupled together, and the second rod 20 is prevented from falling off from the first rod 10. The driving section 23 drives the second tooth-shaped portion 21 to rotate through the second rod section 22, so that the second tooth-shaped portion 21 has an avoidance position corresponding to the first tooth-shaped portion 13 and a stop position offset from the first tooth-shaped portion 13. When the self-breaking screw plug is held and taken by using the holding and taking device, the driving section 23 drives the second tooth-shaped part 21 to rotate through the second rod section 22, so that the second tooth-shaped part 21 has an avoiding position which is arranged corresponding to the first tooth-shaped part 13, and the first tooth-shaped part 13 can be matched with the self-breaking part. The continuous rotation driving section 23 drives the second tooth-shaped portion 21 to rotate through the second rod section 22, so that the second tooth-shaped portion 21 is located at a stopping position which is staggered with the first tooth-shaped portion 13, and at the moment, the second tooth-shaped portion 21 stops the self-breaking portion, and the self-breaking screw plug is prevented from falling off the holding and taking device. After the screw plug is screwed into the screw seat of the pedicle screw, the self-breaking part is forcibly screwed off. At this time, the screw plug is separated from the self-breaking portion, and since the second tooth-shaped portion 21 always stops the self-breaking portion, the self-breaking portion does not fall off from the holding device, and the self-breaking portion is moved out of the human body along with the holding device. Therefore, the technical solution of the present embodiment effectively solves the problem in the related art that the self-breaking portion is easily dropped from the plurality of teeth-shaped pieces. Preferably, the drive section 23 and the second rod section 22 are connected together by a screw thread arrangement.

The above-mentioned corresponding arrangement means that the projection of the outer contour of the second tooth-shaped portion in the bottom end face of the first tooth-shaped portion is located in the outer contour of the first tooth-shaped portion or overlaps with the outer contour of the first tooth-shaped portion. The staggered arrangement means that a part of the projection of the second tooth-shaped part on the bottom end face of the first tooth-shaped part (the tooth of the second tooth-shaped part) protrudes out of the outer contour of the first tooth-shaped part or is positioned outside the outer contour of the first tooth-shaped part.

As shown in fig. 5 to 7, the outer contour of the second tooth portion 21 is the same as that of the first tooth portion 13 for ease of processing and molding. The outer contour of the second tooth portion 21 is the same as the outer contour of the first tooth portion 13, which means that the second tooth portion 21 and the first tooth portion 13 have the same number of teeth, modulus, pitch circle diameter and pressure angle. In this way, the shape of the second tooth portion 21 matches the shape of the first tooth portion 13, which is advantageous for improving the machining efficiency.

As shown in fig. 9 and 10, in order to quickly and accurately hold the second tooth portion 21 at the retreat position and the stop position, a positioning structure 30 is provided between the driving segment 23 and the first rod segment 11 so that the second tooth portion 21 can be held at the retreat position and the stop position.

Of course, in embodiments not shown in the figures, a positioning structure is provided between the drive segment and the first rod segment to enable the second toothing to be held in the retracted or stop position.

As shown in fig. 9 and 10, the positioning structure 30 includes a first positioning hole 31, a second positioning hole 32, and a positioning member 33 engaged with the first positioning hole 31 and the second positioning hole 32. The driving section 23 is provided with a positioning member 33, and the first rod section 11 is provided with a first positioning hole 31 and a second positioning hole 32. When the positioning element 33 is located in the first positioning hole 31, the second tooth-shaped portion 21 is located at the avoiding position, and when the positioning element 33 is located in the second positioning hole 32, the second tooth-shaped portion 21 is located at the stopping position. The positioning pieces 33 are respectively fitted with the first positioning hole 31 and the second positioning hole 32, so that the second tooth portion 21 can be held at the escape position and the stopper position. The structure is simple and the positioning effect is good.

Of course, in the embodiment not shown in the drawings, the first rod segment is provided with a positioning member, and the driving segment is provided with a first positioning hole and a second positioning hole.

As shown in fig. 9 and 10, the positioning member 33 is disposed on the driving section 23, and the positioning member 33 includes a mounting hole 331, an elastic member 332, and a ball 333. The axis of the mounting hole 331 is parallel to the axis of the second rod 20, and the elastic member 332 is disposed in the mounting hole 331. The elastic member 332 applies an elastic force to the spherical body 333 in a direction toward the first positioning hole 31 or the second positioning hole 32. The mounting hole 331 can restrict the elastic member 332 so that the elastic member 332 can stably apply an elastic force toward the first positioning hole 31 or the second positioning hole 32. The spherical body 333 can be held in the first positioning hole 31 or the second positioning hole 32. When the driving section 23 rotates relative to the holding section 12, the ball 333 is disposed to facilitate rolling, so that the driving section 23 can easily drive the ball 333 to move, and the positioning element 33 can be smoothly and quickly located in the first positioning hole 31 or the second positioning hole 32. Specifically, in the process that the second tooth-shaped portion 21 moves from the avoiding position to the stopping position, the ball 333 rotates by 30 degrees and moves upwards to compress the elastic member 332, the ball 333 is separated from the first positioning hole 31, the ball 333 is driven to move along with the movement of the driving section 23, when the ball 333 moves into the second positioning hole 32, the elastic member 332 releases the elastic force, so that the ball 333 quickly falls into the second positioning hole 32 with an impact sound, and the second tooth-shaped portion 21 plays a role in reminding when located at the stopping position. Accordingly, the process of moving the second tooth portion 21 from the stop position to the avoidance position is the reverse process of the above process, and is not described in detail here. The elastic member 332 is preferably a spring. The ball 333 is preferably a steel ball.

Of course, in embodiments not shown in the figures, the positioning element may be provided on the grip section.

Specifically, a first positioning hole 31 and a second positioning hole 32 are provided on the end face of the grip section 12 remote from the first rod section 11. The diameter of the first positioning hole 31 and the diameter of the second positioning hole 32 are both smaller than the diameter of the spherical body 333. In this way, the movement of the ball 333 into the first positioning hole 31 or the second positioning hole 32 and the movement out of the first positioning hole 31 or the second positioning hole 32 are facilitated.

As shown in fig. 9 and 10, the positioning member 33 further includes a limiting member 334 connected in the installation hole 331, and two ends of the elastic member 332 abut against the limiting member 334 and the ball 333, respectively. The limiting member 334 is disposed to facilitate the installation of the elastic member 332 in the installation hole 331, thereby improving the stability of the limiting elastic member 332. The stop 334 is preferably a threaded member. At this time, the mounting hole 331 is provided with a thread section engaged with the screw.

As shown in fig. 9 and 10, in order to know the rotational position of the driving section 23, an avoidance indicator 41 and a stop indicator 42 are provided on the outer surface of the driving section 23. The outer surface of the grip section 12 is provided with an indicator 43 which cooperates with the escape marking 41 and the stop marking 42. The escape mark 41 is provided corresponding to the first positioning hole 31, and the stopper mark 42 is provided corresponding to the second positioning hole 32. Thus, the escape mark 41 is provided corresponding to the first positioning hole 31, so that it can be seen that the positioning member 33 is located in the first positioning hole 31 and the second tooth portion 21 is located at the escape position. The stop mark 42 is disposed corresponding to the second positioning hole 32, so that it can be known that the positioning element 33 is located in the second positioning hole 32 and the second tooth portion 21 is located at the stop position.

The present application further provides a self-breaking plug screw assembly, as shown in fig. 5 to 8, the self-breaking plug screw assembly includes a self-breaking plug screw 50 and a holding device cooperating with the self-breaking plug screw 50. The holding device is the holding device. Since the above-described holding device can solve the problem in the related art that the self-breaking portion is easily dropped from the plurality of tooth-shaped pieces, the self-breaking plug screw assembly having the holding device can achieve the same effect.

As shown in fig. 5 to 8, the self-breaking plug screw 50 has a cylindrical structure, and the self-breaking plug screw 50 includes a plug portion 51, a self-breaking portion 52, and an engagement portion 53 connected in this order. The first tooth-shaped part 13 and the second tooth-shaped part 21 of the holding device are both external teeth, a third tooth-shaped part 531 is arranged on the inner wall of the matching part 53, and the third tooth-shaped part 531 is internal teeth matched with the external teeth. The plug portion 51 of the present embodiment is a plug screw in the related art, the fitting portion 53 is a self-breaking portion in the related art, and the self-breaking portion 52 is a connection portion between the plug screw and the self-breaking portion in the related art. The strength of the material at the self-breaking portion 52 is weak, and when the torque force applied by the first tooth-shaped portion 13 is greater than the preset torque force of the plug portion 51, the connection portion of the self-breaking portion 52 and the plug portion 51 is twisted off, so that the matching portion 53 is separated from the plug portion 51.

As shown in fig. 5 to 8, a stopping groove 521 is formed on the inner wall of the self-breaking portion 52, and when the second tooth-shaped portion 21 of the holding device is located at the stopping position, the second tooth-shaped portion 21 extends into the stopping groove 521 and is matched with the groove wall of the stopping groove 521 in a stopping manner. Thus, the second tooth-shaped portion 21 is in stop engagement with the groove wall of the stop groove 521, and the engaging portion 53 is effectively prevented from falling off the first tooth-shaped portion 13.

As shown in fig. 5 to 8, the first tooth-shaped portion 13 drives the self-breaking screw plug 50 to rotate, and simultaneously, the screw plug portion 51 is convenient to screw into the screw seat of the pedicle screw. The screw portion 51 includes a threaded section 511, and an axis of the threaded section 511 is parallel to an extending direction of the third tooth portion 531.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A holding device, comprising:

the first rod body (10) comprises a first rod section (11) and a holding section (12) connected with the first rod section (11), and a first tooth-shaped part (13) is arranged at one end, far away from the holding section (12), of the first rod section (11);

a second rod body (20) comprising a second tooth-shaped portion (21), a second rod section (22) and a driving section (23) which are sequentially connected, wherein the second rod section (22) rotatably penetrates through the first rod body (10), the second tooth-shaped portion (21) is stopped at one end of the first tooth-shaped portion (13) far away from the holding section (12), the driving section (23) is stopped at one end of the holding section (12) far away from the first tooth-shaped portion (13),

the driving section (23) drives the second tooth-shaped part (21) to rotate through the second rod section (22), so that the second tooth-shaped part (21) has an avoidance position corresponding to the first tooth-shaped part (13) and a stop position staggered with the first tooth-shaped part (13).

2. Holding device according to claim 1, characterized in that the outer contour of the second toothing (21) is identical to the outer contour of the first toothing (13).

3. Holding device according to claim 1, characterized in that a positioning structure (30) is provided between the drive section (23) and the first rod section (11) to enable the second toothing (21) to be held in the escape position and/or the stop position.

4. The holding device according to claim 3, wherein the positioning structure (30) includes a first positioning hole (31), a second positioning hole (32), and a positioning member (33) engaged with the first positioning hole (31) and the second positioning hole (32), the positioning member (33) is disposed on one of the driving section (23) and the first rod section (11), the first positioning hole (31) and the second positioning hole (32) are disposed on the other of the driving section (23) and the first rod section (11), the second tooth portion (21) is located at the avoiding position when the positioning member (33) is located in the first positioning hole (31), and the second tooth portion (21) is located at the stopping position when the positioning member (33) is located in the second positioning hole (32).

5. The holding device according to claim 4, wherein the positioning member (33) is disposed on the driving section (23) or the holding section (12), the positioning member (33) includes a mounting hole (331), an elastic member (332), and a ball (333), an axis of the mounting hole (331) is parallel to an axis of the second rod (20), the elastic member (332) is disposed in the mounting hole (331), the elastic member (332) applies an elastic force to the ball (333) in a direction toward the first positioning hole (31) or the second positioning hole (32), and the ball (333) can be held in the first positioning hole (31) or the second positioning hole (32).

6. The holding device according to claim 5, wherein the positioning member (33) further comprises a limiting member (334) connected to the mounting hole (331), and two ends of the elastic member (332) respectively abut against the limiting member (334) and the ball (333).

7. The holding device according to claim 4, wherein an avoiding mark (41) and a stopping mark (42) are arranged on the outer surface of the driving section (23), an indicating structure (43) matched with the avoiding mark (41) and the stopping mark (42) is arranged on the outer surface of the holding section (12), the avoiding mark (41) is arranged corresponding to the first positioning hole (31), and the stopping mark (42) is arranged corresponding to the second positioning hole (32).

8. A self-breaking screw plug assembly comprising a self-breaking screw plug (50) and a holding device cooperating with said self-breaking screw plug (50), characterized in that said holding device is a holding device according to any one of claims 1 to 7.

9. The self-breaking screw plug assembly according to claim 8, wherein the self-breaking screw plug (50) is of a cylindrical structure, the self-breaking screw plug (50) comprises a screw plug portion (51), a self-breaking portion (52) and a matching portion (53) which are sequentially connected, the first tooth-shaped portion (13) and the second tooth-shaped portion (21) of the holding device are both external teeth, a third tooth-shaped portion (531) is arranged on the inner wall of the matching portion (53), the third tooth-shaped portion (531) is internal teeth matched with the external teeth, a stopping groove (521) is arranged on the inner wall of the self-breaking portion (52), and when the second tooth-shaped portion (21) of the holding device is located at the stopping position, the second tooth-shaped portion (21) extends into the stopping groove (521) and is matched with a groove wall stopping of the stopping groove (521).

10. Self-breaking screw plug assembly according to claim 9, wherein the screw plug portion (51) comprises a threaded section (511), the axis of the threaded section (511) being parallel to the extension direction of the third tooth-shaped portion (531).