CN219089595U - Vertebral body nail and vertebral body nail dismounting device - Google Patents

Abstract

The application discloses a centrum nail and centrum nail dismouting device. Wherein, the centrum nail includes nail seat, screw, connective bar and catch. The nail seat is provided with a connecting hole, a mounting groove and a limiting groove, the connecting hole is arranged on the nail seat in a penetrating mode, the nail seat comprises a top end and a bottom end, the mounting groove is recessed from the top end of the nail seat towards a direction close to the bottom end, and the limiting groove extends along the outer peripheral surface of the nail seat; the end part of the screw is connected in the connecting hole; the connecting rod is arranged in the mounting groove; the lock ring is sleeved on the nail seat and is clamped in the limiting groove so as to lock the connecting rod on the nail seat. The application can solve the problem that the use stability and reliability of the vertebral body nail system in the prior art are relatively poor.

Description

Vertebral body nail and vertebral body nail dismounting device

Technical Field

The application relates to the technical field of medical instruments, in particular to a vertebral body nail and a vertebral body nail dismounting device.

Background

Currently, the vertebral body nail system on the market mainly comprises a screw, a nail seat, a connecting rod, a nut and other structures. The screw is fixedly connected with the nail seat, the connecting rod is connected to the nail seat through the mounting groove, the nut is connected to the nail seat through threads, and then the connecting rod can be limited on the nail seat.

However, in such a vertebral body nail system, the nut is screwed on the nail seat, and after a certain period of use, the nut is easy to fall back on the nail seat to loosen, so that the stability and reliability of use are poor.

Disclosure of Invention

The main aim of this application is to provide a centrum nail and centrum nail dismouting device to solve the relatively poor problem of stability in use and reliability of centrum nail system among the prior art.

According to one aspect of embodiments of the present application, there is provided a vertebral body nail comprising:

the nail seat is provided with a connecting hole, a mounting groove and a limiting groove, the connecting hole is arranged on the nail seat in a penetrating mode, the nail seat comprises a top end and a bottom end, the mounting groove is recessed from the top end of the nail seat towards a direction close to the bottom end, and the limiting groove extends along the outer peripheral surface of the nail seat;

the end part of the screw is connected in the connecting hole;

the connecting rod is arranged in the mounting groove;

the locking ring is sleeved on the nail seat and is clamped in the limiting groove so as to lock the connecting rod on the nail seat.

Further, the nail seat comprises a cylindrical main body, the connecting hole extends along the length direction of the cylindrical main body, and the mounting groove penetrates through the radial direction of the cylindrical main body.

Further, the number of the mounting grooves is two, the two mounting grooves are arranged on the nail seat in a cross shape, so that four protruding blocks are arranged at intervals on the top end of the nail seat, and the limiting grooves are formed in the four protruding blocks.

Further, a first chamfer is arranged on the side wall of the limiting groove, and a second chamfer matched with the first chamfer is arranged on the inner side of the locking ring.

Further, the screw is movably connected in the connecting hole.

Further, the connecting hole is a conical threaded hole, the cross section of the conical threaded hole gradually becomes larger along the direction away from the screw, the end part of the screw is provided with an external thread used for being connected with the conical threaded hole in a matched mode, and a movable gap is reserved between the external thread and the thread of the conical threaded hole.

On the other hand, the application still provides a centrum nail dismouting device, centrum nail dismouting device is used for carrying out the dismouting to foretell centrum nail, centrum nail dismouting device includes:

a compression bar;

the ejector rod is sleeved on the periphery of the compression bar, and can reciprocate along the length direction of the compression bar under the action of external force;

the clamping rod comprises a rod-shaped main body and a clamping sleeve, the rod-shaped main body is sleeved on the periphery of the ejector rod and can reciprocate along the length direction of the pressing rod, the clamping sleeve is arranged at the end part of the rod-shaped main body, and the clamping sleeve is in a clamping state and an opening state;

the outer sleeve is sleeved on the rod-shaped main body, moves along the length direction of the rod-shaped main body under the action of external force, and enables the clamping sleeve to be switched between the clamping state and the open state.

Further, the outer sleeve is connected with the rod-shaped main body through connecting threads, and an operating handle is arranged on the outer sleeve.

Further, the outer sleeve moves towards the direction close to the clamping sleeve to enable the clamping portions to be close to each other and to be in the clamping state, and moves towards the direction far away from the clamping sleeve to enable the clamping portions to be reset and to be in the opening state.

Further, a first avoidance groove for avoiding the connecting rod is formed in the clamping sleeve; and/or the number of the groups of groups,

the inner wall of the connecting hole is provided with a limiting step, the pressure lever is used for propping against the limiting step, and the end part of the pressure lever is provided with a second avoidance groove for avoiding the connecting rod; and/or the number of the groups of groups,

the end part of the ejector rod is provided with a circular groove coaxial with the ejector rod, and the side wall of the circular groove is provided with a third avoidance groove for avoiding the convex block of the vertebral body nail.

Compared with the prior art, the technical scheme of the application has at least the following technical effects:

when the vertebral body nail is actually assembled, the screw is connected in the connecting hole, then the connecting rod is installed in the installation groove from the top end of the nail seat, and finally the locking ring is sleeved in the limiting groove of the nail seat, and the connecting rod is limited in the installation groove on the nail seat. Compared with the vertebral body nail system in the prior art, the locking ring is sleeved in the limiting groove on the nail seat to lock the connecting rod, so that the phenomenon of backspacing does not occur, and the connecting rod can be locked on the nail seat for a long time. Meanwhile, the number of parts of the vertebral body nail is relatively small, the structure is simple, and when the locking ring is installed on the nail seat, the nail seat is retracted and cannot be outwards spread, so that the risk of nail explosion is avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is an exploded view of a vertebral body nail disclosed in an embodiment of the present application;

FIG. 2 is a schematic view of a vertebral body nail according to an embodiment of the present application in a first view;

FIG. 3 is a cross-sectional view of the seat portion of the vertebral body nail of FIG. 2;

FIG. 4 is a schematic view of a vertebral body nail according to an embodiment of the present application in a second view;

FIG. 5 is a partial cross-sectional view of the seat portion of the vertebral body nail of FIG. 4;

FIG. 6 is a front view of a staple holder disclosed in an embodiment of the present application;

FIG. 7 is a cross-sectional view of the staple holder of FIG. 6;

FIG. 8 is a perspective view of a nail holder according to an embodiment of the present application;

FIG. 9 is a front view of a screw as disclosed in an embodiment of the present application;

FIG. 10 is a schematic view of the structure of a locking ring disclosed in an embodiment of the present application;

FIG. 11 is a schematic view of a nail locking mechanism of a nail removing device according to an embodiment of the present disclosure;

FIG. 12 is a front view of a locking assembly of a vertebral body nail disclosed in an embodiment of the present application;

FIG. 13 is a cross-sectional view of a locking device for removing and installing a vertebral body nail disclosed in an embodiment of the present application;

FIG. 14 is a front view of a vertebral body nail removal device of the present disclosure in an exemplary embodiment;

FIG. 15 is a cross-sectional view of a vertebral body nail removal device of the present disclosure in accordance with an embodiment of the present disclosure;

FIG. 16 is a schematic view of a vertebral body nail removal device according to an embodiment of the present disclosure;

FIG. 17 is a cross-sectional view of FIG. 16;

FIG. 18 is a partial schematic view of a compression bar in a vertebral body nail assembly and disassembly device according to an embodiment of the present disclosure in a first view;

FIG. 19 is a partial schematic view of a compression bar in a vertebral body nail assembly and disassembly device according to an embodiment of the present disclosure in a second view;

FIG. 20 is a schematic view of the structure of the ejector pins in the vertebral body nail removing and installing device disclosed in the embodiment of the present application;

fig. 21 is a schematic view of the structure of the ejector pin and the locking ring of the vertebral body nail assembling and disassembling device according to the embodiment of the present application when the ejector pin and the locking ring are matched together.

Wherein the above figures include the following reference numerals:

10. a nail seat; 101. a cylindrical body; 102. a bump; 11. a connection hole; 111. a limit step; 12. a mounting groove; 13. a limit groove; 131. a first chamfer; 20. a screw; 30. a connecting rod; 40. a locking ring; 41. a second chamfer; 50. a compression bar; 51. the second avoiding groove; 60. a push rod; 61. a third avoidance groove; 62. a circular groove; 70. a clamping rod; 71. a rod-shaped main body; 72. a clamping sleeve; 721. a clamping part; 722. the first avoiding groove; 80. a jacket; 81. an operation handle; 90. and (5) connecting threads.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

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 in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1 to 5, according to an embodiment of the present application, there is provided a vertebral body nail including a nail seat 10, a screw 20, a connecting rod 30, and a locking ring 40.

Wherein, the nail seat 10 is provided with a connecting hole 11, a mounting groove 12 and a limit groove 13, the connecting hole 11 is penetrated on the nail seat 10, the nail seat 10 comprises a top end and a bottom end, the mounting groove 12 is recessed from the top end of the nail seat 10 towards a direction close to the bottom end, and the limit groove 13 extends along the outer peripheral surface of the nail seat 10; the end of the screw 20 is connected in the connecting hole 11; the connecting rod 30 is installed in the installation groove 12; the locking ring 40 is sleeved on the nail seat 10 and is clamped in the limiting groove 13 to lock the connecting rod 30 on the nail seat 10.

When the vertebral body nail is actually assembled, the screw 20 is firstly connected in the connecting hole 11, then the connecting rod 30 is installed in the mounting groove 12 from the top end of the nail seat 10, finally the locking ring 40 is sleeved in the limiting groove 13 of the nail seat 10, and the connecting rod 30 is limited in the mounting groove 12 on the nail seat 10. Compared with the prior art vertebral body nail system, the locking ring 40 is sleeved in the limiting groove 13 on the nail seat 10 to lock the connecting rod 30, so that the connecting rod 30 can be locked on the nail seat 10 for a long time without a backspacing phenomenon. Meanwhile, the number of parts of the vertebral body nail in the embodiment is relatively small, the structure is simple, and when the locking ring 40 is installed on the nail seat 10, the nail seat 10 is retracted and cannot be outwards spread, so that the risk of nail explosion is avoided.

It should be noted that, the top end of the nail seat 10 in this embodiment is the end facing away from the operation site when in use, and the bottom end is the end near the operation site when in use. The connecting rod 30 in this embodiment may be connected to one vertebral body nail, or may be connected to two or more vertebral body nails, that is, a plurality of vertebral body nails may share one connecting rod 30 in the actual use process.

As shown in fig. 6 to 10, the nail holder 10 in the present embodiment includes a cylindrical body 101, a connection hole 11 extending in a length direction of the cylindrical body 101, and a mounting groove 12 penetrating in a radial direction of the cylindrical body 101. In this embodiment, by arranging the connection hole 11 in a form extending along the length direction of the cylindrical body 101, it is more suitable for the installation of the screw 20 from both ends of the nail holder 10, and arranging the installation groove 12 in a radial direction penetrating the cylindrical body 101, it is more convenient for the connection rod 30 to be installed on the nail holder 10 through the installation groove 12, and for the operation and use of the entire vertebral body nail during the operation.

Of course, in other embodiments of the present application, the connection hole 11 may also be provided as a blind hole, and the mounting groove 12 may not penetrate the radial direction of the cylindrical body 101.

In a specific embodiment of the present application, the two mounting grooves 12 are arranged in two, the two mounting grooves 12 are arranged on the nail base 10 in a cross shape, so that the top end of the nail base 10 forms four protruding blocks 102 arranged at intervals, and the limiting groove 13 is arranged on the four protruding blocks 102. Thus, when the locking ring 40 is sleeved in the limiting groove 13, the four protruding blocks 102 are folded towards the inner side of the cylindrical main body 101 and close to each other, so that the locking ring 40 is conveniently sleeved in the limiting groove 13, and the locking ring is simple in structure and convenient to operate. In addition, the number of the mounting grooves 12 is two, so that the mounting direction of the connecting rod 30 can be conveniently adjusted according to the actual use condition in the actual use process of the vertebral body nails.

Of course, in other embodiments of the present application, the mounting groove 12 may be provided in one or two or more, and any other modifications within the spirit of the present application are within the scope of the present application.

Optionally, a first chamfer 131 is provided on the side wall of the limit groove 13 in this embodiment, and a second chamfer 41 adapted to the first chamfer 131 is provided on the inner side of the locking ring 40. Specifically, when the first chamfer 131 is provided as a rounded corner, the second chamfer 41 is provided as a rounded corner; when the first chamfer 131 is set to a chamfer angle, then the second chamfer 41 is set to a chamfer angle that is compatible with the first chamfer 131. Fig. 3 shows a case where the first chamfer 131 and the second chamfer 41 are chamfer angles. Through setting up first chamfer 131 and the second chamfer 41 of looks adaptation in this embodiment, the catch 40 of being more convenient for slides into and the card is established in spacing groove 13, simple structure, and the cooperation is stable, the dismouting of being convenient for.

Referring to fig. 3 to 7, the screw 20 in the present embodiment is movably connected in the connecting hole 11, so that the screw seat 10 and the screw 20 can be moved relative to each other during the actual process of using the vertebral body screw, which is more convenient for use.

Specifically, in order to movably connect the screw 20 and the socket 10 together, in this embodiment, the connection hole 11 is provided as a tapered threaded hole (as can be seen in fig. 7) whose cross section gradually increases in a direction away from the screw 20, and the end of the screw 20 is provided with an external thread for mating connection with the tapered threaded hole, with a clearance gap (as can be seen in fig. 3) between the external thread and the thread of the tapered threaded hole. That is, in the present embodiment, the inner diameter of the end of the connecting hole 11 far from the screw 20 is relatively large, the inner diameter of the end near the connecting hole 11 is relatively small, and a clearance is provided between the threads of the two, so that the screw 20 can move relative to the screw seat 10, in particular, can rotate or swing left and right relative to the screw seat 10 (see fig. 4 and 5), and in this process, the design of the tapered threaded hole can provide a necessary space for the swing of the screw 20, which is convenient for use.

Further, the width of the spiral line of the tapered threaded hole (i.e., the connecting hole 11) in the present embodiment gradually changes in a direction away from the screw 20, and it is understood that the width of the spiral line in the present embodiment refers to the maximum width of the spiral line of the threaded hole as seen by cutting the threaded hole along the axial direction of the nail base 10, as shown in fig. 3D. So set up, when installing screw 20 in connecting hole 11, can make screw 20 swing joint in connecting hole 11, simple structure is convenient for assemble.

Alternatively, the screw thread of the screw hole in this embodiment has a triangular, rectangular, trapezoidal or inverted trapezoidal longitudinal section. The longitudinal section referred to herein is a section obtained by cutting the screw thread of the screw hole along the axial direction of the nail seat 10. Fig. 3 and 7 show the case where the longitudinal section of the screw thread is rectangular.

In this embodiment, the screw 20 is in threaded fit with the nail seat 10, only the screw is screwed in from the bottom end of the nail seat 10, no pressure element is needed, the screw 20 passes through the nail seat 10 from the top end to the bottom end of the nail seat 10, the pressure element is pressed into the nail seat 10 by a press machine for press fitting, the assembly is convenient, the processing and assembly cost is reduced, the screw 20 is movably connected with the nail seat 10, a certain angle can be formed, and the lock ring 40 can well lock the connecting rod 30, the nail seat 10 and the screw 20. The nail seat 10 is provided with two mounting grooves 12, the connecting rod 30 can be clamped by the adduction of the mounting grooves 12, the locking ring 40 is a clamp type non-threaded type, a thread space is not required, the outer diameter of the nail seat 10 can be reduced, the notch of the vertebral body nail is obviously reduced, and clinical application is facilitated. At this time, the four protrusions 102 on the nail seat 10 have a certain elasticity, which is more favorable for the locking ring 40 to be locked on the nail seat 10 or disengaged from the nail seat 10.

Referring to fig. 11 to 21, according to another aspect of the present application, there is provided a vertebral body nail assembling and disassembling device for assembling and disassembling a vertebral body nail in the above-described embodiment. Specifically, the vertebral body nail assembling and disassembling device in this embodiment includes a compression bar 50, a push rod 60, a clamping bar 70, and a jacket 80.

Wherein, the ejector rod 60 is sleeved on the periphery of the compression bar 50, and the ejector rod 60 can reciprocate along the length direction of the compression bar 50 under the action of external force; the clamping rod 70 comprises a rod-shaped main body 71 and a clamping sleeve 72, wherein the rod-shaped main body 71 is sleeved on the periphery of the ejector rod 60 and can reciprocate along the length direction of the compression rod 50, the clamping sleeve 72 is arranged at the end part of the rod-shaped main body 71, and the clamping sleeve 72 has a clamping state and an opening state; the outer sleeve 80 is sleeved on the rod-shaped main body 71, and the outer sleeve 80 is driven by external force to move the clamping rod 70 along the length direction of the compression rod 50, so that the clamping sleeve 72 is switched between a clamping state and an open state.

Referring to fig. 11 to 13, when it is required to perform locking (the locking ring 40 is installed in the limiting groove 13), the locking ring 40 is firstly placed at the top end of the nail seat 10 or at the end of the ejector pin 60, then the clamping sleeve 72 of the vertebral body nail dismounting device is sleeved on the nail seat 10, the outer sleeve 80 is used to drive the clamping rod 70 to move, so that the clamping sleeve 72 is switched from the open state to the clamping state to clamp the nail seat 10, and one end of the ejector pin pressing rod 50 is abutted against the inner side of the nail seat 10, at this time, the ejector pin 60 is forced to press or rotate in a direction approaching to the nail seat 10, the protrusion 102 on the nail seat 10 is forced to move inwards, the locking ring 40 can be pressed and sleeved in the limiting groove 13 to complete the locking action, then the outer sleeve 80 is forced again, so that the clamping sleeve 72 is switched to the open position, and then the nail seat 10 is dismounted.

Referring to fig. 14 to 17, when the nail is to be removed (the locking ring 40 is removed from the limiting groove 13), the clamping sleeve 72 of the vertebral body nail removing device is first sleeved on the locking ring 40, the outer sleeve 80 drives the clamping rod 70 to move, the clamping sleeve 72 is switched from the open state to the clamping state to clamp the locking ring 40, one end of the ejector rod pressing rod 50 abuts against the inner side of the nail seat 10, at this time, the clamping rod 70 is forced, the clamping rod 70 moves towards the direction away from the nail seat 10 relative to the pressing rod 50, the protruding block 102 moves towards the inner side of the nail seat 10, and the locking ring 40 can be removed from the limiting groove 13, so that the nail removing action is completed.

It will be appreciated that the force applied to the push rod 60 and the clamping rod 70 during the removal and locking of the nail in this embodiment may be achieved by providing a handle or a screw structure at the end of the vertebral body nail removal device, and is not particularly limited in this embodiment.

Further, the outer sleeve 80 and the rod-shaped body 71 in this embodiment are connected by connecting screw threads 90, and an operation handle 81 is provided on the outer sleeve 80. In this embodiment, by providing the connecting screw 90 between the outer sleeve 80 and the rod-shaped body 71, when the outer sleeve 80 is rotated by the operation handle 81, the outer sleeve 80 can be moved relative to the rod-shaped body 71, and the clamping sleeve 72 can be switched between the clamping state and the open state.

Of course, in other embodiments of the present application, the outer sleeve 80 may be driven by a driving cylinder or the like, and any other modification within the contemplation of the present application is within the scope of the present application.

Alternatively, the clamping sleeve 72 in the present embodiment includes the cylindrical body 101 and the plurality of clamping portions 721 arranged at intervals along the circumference of the cylindrical body 101, the outer sleeve 80 moves toward the direction approaching the clamping sleeve 72 to bring the plurality of clamping portions 721 close to each other in the clamped state, and the outer sleeve 80 moves toward the direction away from the clamping sleeve 72 to reset the plurality of clamping portions 721 in the opened state, which is simple and convenient to operate.

In order to facilitate the disassembly and assembly of the vertebral body nails, the clamping sleeve 72 is provided with a first avoiding groove 722 for avoiding the connecting rod 30; a limiting step 111 is arranged on the inner wall of the connecting hole 11, the compression bar 50 is used for propping against the limiting step 111, and a second avoiding groove 51 for avoiding the connecting rod 30 is arranged at the end part of the compression bar 50; the end of the ejector rod 60 is provided with a circular groove 62 coaxial with the ejector rod 60, and the side wall of the circular groove 62 is provided with a third avoidance groove 61 avoiding the convex block 102 of the vertebral body nail.

Specifically, during locking nails, the locking ring 40 is installed inside the end of the ejector rod 60, at this time, the circular groove 62 at the end of the ejector rod 60 can hold the locking ring 40, then the pressing rod 50 passes through the nail seat 10 and presses the pressing rod 50 against the side groove of the nail seat 10, the connecting rod 30 is in the side groove of the pressing rod 50, meanwhile, the connecting rod 30 passes through the side groove of the cutting sleeve, the outer sleeve 80 is pressed or rotated, the outer sleeve 80 is moved forward relative to the cutting sleeve towards the head of the clamping part 721, at this time, the outer sleeve 80 can be made to push the connecting rod 30, the connecting rod 30 is made to press the nail seat 10 and press the screw 20, at the same time, the clamping part 721 can be made to retract inside the clamping part 721 and clamp the bottom surface of the nail seat 10 due to the relative forward movement of the outer sleeve 80, the clamping part 721 and the outer sleeve 80 can be made to preload the nail seat 10 and the screw 20, and the follow-up locking ring 40 can be made to further force the locking nails.

When the nail is detached, the ejector rod 60 is retracted, the ejector rod 60 is prevented from blocking the locking ring 40, the pressing rod 50 passes through the nail seat 10 and abuts against the limiting step 111, the pressing rod 50 presses the nail seat 10, the connecting rod 30 is positioned in the second avoidance groove 51, the outer sleeve 80 is pressed or rotated, the outer sleeve 80 moves towards the head of the clamping part 721 relative to the clamping part 721, the clamping part 721 is retracted and hooks the locking ring 40, so that the pressing rod 50 presses the nail seat 10, the clamping rod 70 is pulled or rotated, the clamping part 721 moves towards the direction that the locking ring 40 is far away from the nail seat 10 relative to the pressing rod 50, the locking ring 40 breaks loose from the nail seat 10 along the action chamfer, the locking ring 40 and the nail seat 10 are separated, and the cone nail is detached from the nail locking state, so that the nail detachment action is completed.

In summary, the vertebral body nail dismounting device in this embodiment can realize the locking nail and tear open the nail, can realize pushing down the connective bar and drawing the nail seat, the connective bar lifts the nail to make connective bar and screw pre-locking, simple structure, facilitate the use.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative 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 in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. A vertebral body nail, comprising:

the nail seat (10), be provided with connecting hole (11), mounting groove (12) and spacing groove (13) on nail seat (10), connecting hole (11) wear to establish on nail seat (10), nail seat (10) include top and bottom, mounting groove (12) are followed the top of nail seat (10) is towards being close to the direction of bottom is sunken, spacing groove (13) are along the peripheral surface extension of nail seat (10);

a screw (20), an end of the screw (20) being connected within the connection hole (11);

a connecting rod (30), wherein the connecting rod (30) is installed in the installation groove (12);

the locking ring (40) is sleeved on the nail seat (10) and is clamped in the limiting groove (13) so as to lock the connecting rod (30) on the nail seat (10).

2. The vertebral body nail according to claim 1, characterized in that the nail seat (10) comprises a cylindrical body (101), the connecting hole (11) extends along the length direction of the cylindrical body (101), and the mounting groove (12) penetrates in the radial direction of the cylindrical body (101).

3. The vertebral body nail according to claim 2, characterized in that the number of the mounting grooves (12) is two, the two mounting grooves (12) are arranged on the nail seat (10) in a cross shape, so that four protruding blocks (102) are arranged at intervals on the top end of the nail seat (10), and the limit grooves (13) are arranged on the four protruding blocks (102).

4. The vertebral body nail according to claim 1, characterized in that a first chamfer (131) is provided on the side wall of the limit groove (13), and a second chamfer (41) adapted to the first chamfer (131) is provided on the inner side of the locking ring (40).

5. The vertebral body nail according to claim 1, characterized in that said screw (20) is movably connected in said connecting hole (11).

6. The vertebral body nail according to claim 5, characterized in that the connecting hole (11) is a conical threaded hole, the cross section of the conical threaded hole gradually increases along the direction away from the screw (20), the end of the screw (20) is provided with an external thread for being connected with the conical threaded hole in a matching way, and a clearance is formed between the external thread and the threads of the conical threaded hole.

7. A vertebral body nail dismounting device, characterized in that it is used for dismounting the vertebral body nail according to any one of claims 1 to 6, comprising:

a compression bar (50);

the ejector rod (60) is sleeved on the periphery of the pressure rod (50), and the ejector rod (60) can reciprocate along the length direction of the pressure rod (50) under the action of external force;

the clamping rod (70), the clamping rod (70) comprises a rod-shaped main body (71) and a clamping sleeve (72), the rod-shaped main body (71) is sleeved on the periphery of the ejector rod (60) and can reciprocate along the length direction of the compression rod (50), the clamping sleeve (72) is arranged at the end part of the rod-shaped main body (71), and the clamping sleeve (72) is in a clamping state and an opening state;

and the outer sleeve (80) is sleeved on the rod-shaped main body (71), the outer sleeve (80) moves along the length direction of the rod-shaped main body (71) under the action of external force, and the clamping sleeve (72) is switched between the clamping state and the open state.

8. The vertebral body nail dismounting device according to claim 7, characterized in that the outer sleeve (80) and the rod-shaped main body (71) are connected through a connecting thread (90), and an operating handle (81) is arranged on the outer sleeve (80).

9. The vertebral body nail assembling and disassembling device according to claim 7, wherein the plurality of clamping portions (721) are arranged at intervals on the circumference of the clamping sleeve (72), the outer sleeve (80) moves towards the direction approaching the clamping sleeve (72) to enable the plurality of clamping portions (721) to be close to each other and to be in the clamping state, and the outer sleeve (80) moves towards the direction separating from the clamping sleeve (72) to enable the plurality of clamping portions (721) to be reset and to be in the opening state.

10. The vertebral body nail dismounting device according to claim 7, characterized in that a first avoiding groove (722) for avoiding the connecting rod (30) is arranged on the clamping sleeve (72); and/or the number of the groups of groups,

a limiting step (111) is arranged on the inner wall of the connecting hole (11), the pressure lever (50) is used for propping against the limiting step (111), and a second avoidance groove (51) for avoiding the connecting rod (30) is formed in the end part of the pressure lever (50); and/or the number of the groups of groups,

the end part of the ejector rod (60) is provided with a circular groove (62) coaxial with the ejector rod (60), and the side wall of the circular groove (62) is provided with a third avoidance groove (61) for avoiding the convex block (102) of the vertebral body nail.

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