CN219306895U

CN219306895U - Pivot pedicle screw

Info

Publication number: CN219306895U
Application number: CN202222848705.1U
Authority: CN
Inventors: 姜为民; 刘义杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-07-07
Anticipated expiration: 2032-10-27

Abstract

The utility model provides an axial pedicle screw, relates to the technical field of medical treatment auxiliary instruments, and solves the technical problems of insufficient pressurization or excessive pressurization caused by disposable pressurization fixation in the prior art. The pedicle screw comprises a connecting body, a first threaded portion and a second threaded portion, wherein the first threaded portion is arranged at one end of the connecting body, the second threaded portion is arranged at the other end of the connecting body, and the screw pitch of the first threaded portion is larger than that of the second threaded portion. According to the utility model, two broken bones of a fracture part are pressurized and fixed through the two threads, and the mode of the threads can ensure that the pressurizing and firm fixing performances are better.

Description

Pivot pedicle screw

Technical Field

The utility model relates to the technical field of medical treatment auxiliary instruments, in particular to an axial pedicle screw.

Background

The Hangman fracture is also called traumatic epistaxis, the treatment mode with better clinical effect at present is that the Hangman fracture is anatomically reset by using an episodic pedicle screw, and has the advantages of no rotation function loss and the like, but the conventional common non-special episodic pedicle screw for treating the Hangman fracture has obvious defects and poor fixation stability, and the screw is only fixed by pressing the pedicle and the lamina behind the fracture and lacks holding force for holding; the compression degree of the screw is mainly judged by experience of an operator when the screw is fixed under compression, and the problem of re-loss of fracture reduction caused by insufficient compression or excessive compression can occur when the screw is fixed under compression at one time.

Disclosure of Invention

The utility model aims to provide an axial pedicle screw, which solves the technical problems of insufficient pressurization or excessive pressurization caused by disposable pressurization fixation in the prior art. The preferred technical solutions of the technical solutions provided by the present utility model can produce a plurality of technical effects described below.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides an axial pedicle screw which comprises a connecting body, a first thread part and a second thread part, wherein the first thread part is arranged at one end of the connecting body, the second thread part is arranged at the other end of the connecting body, and the thread pitch of the first thread part is larger than that of the second thread part.

Preferably, the connecting body is a columnar body, and the through holes are arranged along the axial direction of the columnar body.

Preferably, the second threaded portion has a larger thread diameter than the first threaded portion.

Preferably, one end of the second threaded portion facing the first threaded portion is an inclined wall surface, the wall surface is in a conical shape, and the head end of the wall surface faces the first threaded portion.

Preferably, a polished rod is arranged between the first threaded portion and the second threaded portion, and the diameter of the polished rod is smaller than the thread diameter of the first threaded portion.

Preferably, a tail cap is arranged at one end of the second threaded portion far away from the first threaded portion, and the diameter of the tail cap is larger than that of the second threaded portion.

Preferably, a screwing hole is formed in the end face, far away from the second threaded portion, of the tail cap, and the central axis of the screwing hole coincides with the axis of the connector.

Preferably, the perforation is coaxial with the connector.

Preferably, the length of the pedicle screw ranges from 20 mm to 34 mm, the length of the first threaded portion ranges from 10 mm to 14 mm, and the length of the second threaded portion ranges from 5 mm to 7 mm.

Preferably, the pitch range of the first thread part is 1.5 mm-2.0 mm, the pitch range of the second thread part is 1 mm-1.5 mm, the thread diameter range of the first thread part is 3.5 mm-4.5 mm, and the thread diameter range of the second thread part is 4.5 mm-5.5 mm.

The application adopts the technical scheme, possesses following beneficial effect at least:

the first thread part and the second thread part on the connecting body are fixed more firmly by the connection mode of the threads when two broken bones are fixed, the pressurizing effect is better, and excessive pressurizing can be avoided.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of an exemplary embodiment of the present utility model for providing a pedicle screw structure.

In the figure 1, a linker; 2. a first threaded portion; 3. a second threaded portion; 4. perforating; 5. a wall surface; 6. a polish rod; 7. a tail cap; 8. screwing the hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, based on the examples herein, which are within the scope of the utility model as defined by the claims, will be within the scope of the utility model as defined by the claims.

The embodiment of the utility model provides an axial pedicle screw, which comprises a connecting body 1, a first threaded part 2 and a second threaded part 3, wherein the first threaded part 2 is arranged at one end of the connecting body 1, the second threaded part 3 is arranged at the other end of the connecting body 1, and the screw pitch of the first threaded part 2 is larger than the screw pitch of the second threaded part 3.

In combination with fig. 1, the connecting body 1 is an integral structure of a pedicle screw for pivot, the first thread part 2 and the second thread part 3 on the connecting body 1 are mainly external threads wound on the outer wall of the connecting body 1, the first thread part 2 and the second thread part 3 are respectively arranged at two ends of the connecting body 1, and the thread pitches on the first thread part 2 and the second thread part 3 are different, so that after the first thread part 2 and the second thread part 3 respectively enter two parts of broken bones, the space between the two broken bones is spread by screwing, the fixation is completed, the fixation of the threads to the broken bones is more stable when the broken bones are fixed, the pressurizing effect is better by screwing the pressurizing mode under the condition of ensuring good stability, and the condition that the pressurizing force is insufficient or excessive pressurizing is avoided by gradually realizing the pressurizing through the pressurizing mode of screwing the threads.

In this application, connector 1 is the column, sets up perforation 4 along column axis direction, and the connector 1 of column adopts the form of screw to realize the installation fixedly, and the setting of perforation 4 can be when breaking the bone through the fixed trompil department of breaking bone of pivot pedicle of vertebral arch screw wears to establish the guide pin earlier and leads, then wears to establish pivot pedicle of vertebral arch screw on the guide pin again, takes out the guide pin after screwing up soon at last, and the guide pin plays the effect of direction, avoids pivot pedicle of vertebral arch screw to change the way at the in-process of screwing up. Thus, the perforation 4 is optimally selected by coaxially arranging the perforation 4 and the connector 1, namely, the perforation 4 is arranged at the central shaft of the connector 1, so that the guide pin in the perforation 4 can not influence the rotation of the pedicle screw of the centrum.

In the present embodiment, the thread diameter of the second thread part 3 is larger than the thread diameter of the first thread part 2.

When the pedicle screw is screwed, the first thread 2 enters the pre-hole on the first broken bone and then enters the pre-hole on the second broken bone, so that the two broken bones can be fixed together and rotate continuously, the second thread 3 can be well connected with the first broken bone, the thread diameter of the second thread 3 needs to be larger than that of the first thread 2, and the locking force is not necessarily enough if the thread diameter of the second thread 3 is the same as that of the first thread 2 after the first broken bone is screwed, so that the locking force is ensured if the thread diameter of the second thread 3 is larger.

In one embodiment, the end of the second threaded portion 3 facing the first threaded portion 2 is an inclined wall surface 5, the wall surface 5 has a conical shape, and the head end of the wall surface 5 faces the first threaded portion 2.

The wall surface 5 is the end surface of the second thread part 3, which is contacted with the first broken bone before entering the pre-punching, when the end surface is contacted with the first broken bone, the first thread part 2 is screwed into the second broken bone, at the moment, the wall surface 5 is contacted with the first broken bone for only the first time to play the roles of supporting and fixing, and the wall surface 5 is provided with the threads of the second thread part 3, so that when the pedicle screw of the axial spine is screwed, the second thread part 3 can be screwed into the pre-punching.

In one embodiment, the polish rod 6 is located between the first threaded portion 2 and the second threaded portion 3, and the diameter of the polish rod 6 is smaller than the diameter of the threads of the first threaded portion 2.

The outer part of the polish rod 6 is unthreaded, and the diameter thereof is smaller than the diameter of the threads on the threaded parts on both sides, this can provide an extended effect without the polish rod 6 affecting the screwing of the first threaded portion 2 and the second threaded portion 3.

The second threaded portion 3 is provided with a tail cap 7 at an end remote from the first threaded portion 2, and the diameter of the tail cap 7 is larger than the thread diameter of the second threaded portion 3. The design of the larger diameter tail cap 7 prevents the pedicle screw from entering into the bone while avoiding the problem of over-pressurization when the tail cap 7 is screwed onto the abutting fractured bone.

The end face, far away from the second threaded part 3, of the tail cap 7 is provided with a screwing hole 8, the screwing hole 8 can be an inner hexagonal hole, screwing can be performed through a hexagonal wrench, the central shaft of the screwing hole 8 coincides with the axis of the connector 1, the screwing hole 8 is guaranteed to be positioned at the rotation center of the pedicle screw, the screwing hole 8 is communicated with the perforation 4, and the guide needle can be taken out from the screwing hole 8.

In the specific embodiment of the present application, the length of the pedicle screw ranges from 20 mm to 34 mm, and the length of the pedicle screw may be 22 mm, 28 mm, 32 mm, or the like. The length of the first thread part 2 ranges from 10 mm to 14 mm, the length of the second thread part 3 ranges from 5 mm to 7 mm, the pitch of the first thread part 2 ranges from 1.5 mm to 2.0 mm, the pitch of the second thread part 3 ranges from 1 mm to 1.5 mm, the thread diameter of the first thread part 2 ranges from 3.5 mm to 4.5 mm, and the thread diameter of the second thread part 3 ranges from 4.5 mm to 5.5 mm.

The diameter of the first thread part 2 can be specifically set to be 4 mm, the diameter of the second thread part 3 can be set to be 4.5 mm, the diameter of the tail cap 7 can be 6.4 mm, the pitch of the first thread part 2 is 1.75 mm, and the pitch of the second thread part 3 is 1.25 mm, so that when the second thread part 3 is screwed into fractured bones, a resetting and pressurizing effect of 0.5 mm can be generated on fractured ends after the second thread part 3 is screwed for one circle, and the fractured ends are gradually pressurized to be close to each other along with continuous screwing of screws, so that the fixed fracture tends to be stable.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the present disclosure, the terms "one embodiment," "some embodiments," "examples," "specific examples," "some examples," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, 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 is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. The pedicle screw is characterized by comprising a connecting body (1), a first threaded part (2) and a second threaded part (3), wherein the first threaded part (2) is arranged at one end of the connecting body (1), the second threaded part (3) is arranged at the other end of the connecting body (1), and the thread pitch of the first threaded part (2) is larger than that of the second threaded part (3);

the connecting body (1) is a columnar body, and a perforation (4) is arranged along the axial direction of the columnar body.

2. The pedicle screw according to claim 1, characterized in that the thread diameter of the second thread part (3) is larger than the thread diameter of the first thread part (2).

3. The pedicle screw according to claim 1, characterized in that the end of the second threaded portion (3) facing the first threaded portion (2) is an inclined wall surface (5), the wall surface (5) being conical, the head end of the wall surface (5) facing the first threaded portion (2).

4. The pedicle screw according to claim 1, characterized in that a polish rod (6) is between the first threaded portion (2) and the second threaded portion (3), the diameter of the polish rod (6) being smaller than the thread diameter of the first threaded portion (2).

5. The pedicle screw according to claim 1, characterized in that the end of the second threaded portion (3) remote from the first threaded portion (2) is provided with a tail cap (7), the diameter of the tail cap (7) being larger than the thread diameter of the second threaded portion (3).

6. The pedicle screw according to claim 5, characterized in that a screw hole (8) is provided in the end face of the tail cap (7) facing away from the second threaded part (3), the central axis of the screw hole (8) coinciding with the axis of the connecting body (1).

7. The pedicle screw according to claim 1, characterized in that the perforation (4) is coaxial with the connecting body (1).

8. The pedicle screw according to claim 1, characterized in that the pedicle screw has a length in the range of 20-34 mm, the first threaded portion (2) has a length in the range of 10-14 mm, and the second threaded portion (3) has a length in the range of 5-7 mm.

9. The pedicle screw according to claim 1, characterized in that the pitch of the first thread (2) ranges from 1.5 to 2.0 mm, the pitch of the second thread (3) ranges from 1 to 1.5 mm, the thread diameter of the first thread (2) ranges from 3.5 to 4.5 mm, and the thread diameter of the second thread (3) ranges from 4.5 to 5.5 mm.