CN216754583U

CN216754583U - Self-tapping pressurization pedicle screw

Info

Publication number: CN216754583U
Application number: CN202121576013.5U
Authority: CN
Inventors: 陆文忠
Original assignee: Peoples Hospital of Baise
Current assignee: Peoples Hospital of Baise
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2022-06-17
Anticipated expiration: 2031-07-12

Abstract

The utility model discloses a self-tapping pressurization pedicle screw, which comprises a U-shaped cap, a narrow-distance thread section and a wide-distance thread section, and is characterized in that: the left end of the narrow-pitch threaded section is connected with the wide-pitch threaded section, the right end of the narrow-pitch threaded section is connected with the U-shaped cap, and the U-shaped cap, the narrow-pitch threaded section and the wide-pitch threaded section are integrally formed. The utility model designs a self-tapping pressurized pedicle screw, wherein a U-shaped cap, a narrow-distance thread section and a wide-distance thread section are integrally formed, a self-tapping drill hole is arranged at the position close to the tip of the wide-distance thread section, and threads are generated in the process of rotating the screw, so that the fixation is firmer; the thread pitch of the thread on the narrow-distance thread section is smaller than that of the thread on the wide-distance thread section, so that when the screw rotates, the moving distances of the two bones are different, and the moving distance on the narrow-distance thread section is smaller than that on the wide-distance thread section, so that the two bones are pressed and squeezed tightly, and the fracture surface of the bones can approach to promote bone healing.

Description

Self-tapping pressurization pedicle screw

Technical Field

The utility model belongs to the field of medical instruments, and particularly relates to a self-tapping pressurization pedicle screw.

Background

Posterior spinal surgery is a common surgical procedure, and when fixation or correction is involved, an internal fixation system in the nail rod is essential. Such rod-and-nail systems usually consist of pedicle screws with their fasteners and connecting rods, which can now be divided into two basic groups, namely, monoaxial fixation pedicle screws and polyaxial universal pedicle screws. The technical requirement for nail placement is very high when the single-shaft pedicle screw is used for fixing, if the U-shaped grooves of the 2 nails are not parallel, the connecting rod and the U-shaped grooves are changed from surface contact into point contact, stress concentration is formed, and the nail or the rod is easy to break; if the fixing of more than 2 vertebral bodies is needed, the direction of the screw cap is fixed after the pedicle screw at one side is implanted, the U-shaped grooves of the screw cap are not in the same straight line, so that the connecting rod is difficult to place, the risk of stress concentration is also faced, and the screw which is not in the straight line is easy to loosen or break after the U-shaped grooves are strongly combined into the straight line. Therefore, the operation is difficult, and the probability of adverse reaction of the internal fixing system is greatly increased. The universal pedicle screw overcomes the defects, and due to the universal characteristic, namely the three-dimensional rotation of a certain angle can be performed between the screw body and the U-shaped groove of the screw cap, the screw-rod combination is very easy. However, the universal pedicle screws used at present have small universal mobility, are not easy to install connecting rods, and the locking mechanism is realized by mechanical pressurization of a single clamping bolt, so that the parallel expansion and compression cannot be realized like a single-shaft pedicle screw, namely the vertebral pedicle screw is rotationally corrected, and therefore, the universal pedicle screws can only be used for fixing the spine. Even so, the head of the screw after the fixation of the screw has higher incisional tracks, and the pedicle of vertebral arch where the screw is placed is the most developed position of muscles, which often causes chronic lumbago caused by long-term friction damage of the high-incisional head of the muscle tissue of the fixation part after the operation.

The pedicle screw used at present does not have a corresponding pressurizing and compacting effect on a broken pedicle, so that bones are slowly healed or are malposed in healing, more troubles are caused, the workload of medical workers is increased, the economic burden of a family of a patient is increased, and the pain of the patient is increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model designs the self-tapping pressurizing pedicle screw, the U-shaped cap, the narrow-distance thread section and the wide-distance thread section are integrally formed, the position of the wide-distance thread section close to the tip is provided with a self-tapping drill hole, and the screw thread is generated in the process of rotating the screw, so that the fixation is firmer; the screw pitch of the thread on the narrow-distance thread section is smaller than that of the thread on the wide-distance thread section, after the knob of the pedicle screw is screwed onto the fractured bone, the two fractured bones are in areas with different screw pitches, so that when the screw rotates, the moving distances of the two bones are different, and the moving distance on the narrow-distance thread section is smaller than that on the wide-distance thread section, so that the two bones are pressed and squeezed tightly, and the fracture surface can approach to promote bone healing.

In order to achieve the technical effects, the utility model is realized by the following technical scheme: the utility model provides a self tapping pressurization pedicle of vertebral arch screw, includes U-shaped cap, narrow pitch screw thread section and wide pitch screw thread section, its characterized in that: the left end of the narrow-pitch threaded section is connected with the wide-pitch threaded section, the right end of the narrow-pitch threaded section is connected with the U-shaped cap, and the U-shaped cap, the narrow-pitch threaded section and the wide-pitch threaded section are integrally formed.

Furthermore, the thread pitch of the threads on the narrow-distance thread section is smaller than that of the threads on the wide-distance thread section, a thread-free section is arranged between the narrow-distance thread section and the wide-distance thread section, and the length of the thread-free section is 3-8 mm.

Furthermore, a self-tapping drill opening is formed in the position, close to the tip, of the wide-distance thread section.

Furthermore, the diameter of the whole formed by the narrow-pitch threaded section and the wide-pitch threaded section is gradually reduced from the right to the left.

The utility model has the beneficial effects that:

the utility model designs a self-tapping pressurized pedicle screw, wherein a U-shaped cap, a narrow-distance thread section and a wide-distance thread section are integrally formed, a self-tapping drill hole is arranged at the position close to the tip of the wide-distance thread section, and threads are generated in the process of rotating the screw, so that the fixation is firmer; the screw pitch of the thread on the narrow-distance thread section is smaller than that of the thread on the wide-distance thread section, after the knob of the pedicle screw is screwed onto the fractured bone, the two fractured bones are in areas with different screw pitches, so that when the screw rotates, the moving distances of the two bones are different, and the moving distance on the narrow-distance thread section is smaller than that on the wide-distance thread section, so that the two bones are pressed and squeezed tightly, and the fracture surface can approach to promote bone healing.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a partial view of the present invention;

FIG. 3 is a cross-sectional view of an embodiment of the present invention;

FIG. 4 is an appearance diagram of the embodiment of the present invention;

in the drawings, the reference numbers indicate the following list of parts:

1. a U-shaped cap; 2. a narrow pitch thread segment; 3. a wide thread section; 301. and (4) self-tapping drilling.

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. 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.

Examples

Referring to fig. 1 to 4, the self-tapping pressurization pedicle screw comprises a U-shaped cap 1, a narrow-pitch threaded section 2 and a wide-pitch threaded section 3, and is characterized in that: the left end of the narrow-pitch threaded section 2 is connected with the wide-pitch threaded section 3, the right end of the narrow-pitch threaded section is connected with the U-shaped cap 1, and the U-shaped cap 1, the narrow-pitch threaded section 2 and the wide-pitch threaded section 3 are integrally formed.

The thread pitch of the threads on the narrow-distance thread section 2 is smaller than that of the threads on the wide-distance thread section 3, after the pedicle screw is turned to a fractured bone, the two fractured bones are in areas with different thread pitches, so that when the screw is rotated, the two bones move at different distances, and the movement distance on the narrow-distance thread section is smaller than that on the wide-distance thread section, so that the two bones are pressed and squeezed tightly; a section of thread-free section is arranged between the narrow-distance thread section and the wide-distance thread section, and the length is 3-8 mm.

The self-tapping drill hole 301 is formed in the position, close to the tip, of the wide-distance thread section 3, threads are generated in the process of rotating the screw, and fixing can be firmer.

The diameter of the whole formed by the narrow-pitch threaded section 2 and the wide-pitch threaded section 3 is gradually reduced from the right to the left.

The utility model designs a self-tapping pressurized pedicle screw, wherein a U-shaped cap 1, a narrow-distance thread section 2 and a wide-distance thread section 3 are integrally formed, a self-tapping drill hole 301 is arranged at the position close to the tip of the wide-distance thread section 3, and threads are generated in the process of rotating the screw, so that the fixation is firmer; the thread pitch of the thread on the narrow-distance thread section 2 is smaller than that of the thread on the wide-distance thread section 3, after the knob of the pedicle screw is turned to a fractured bone, the two fractured bones are in areas with different thread pitches, so that when the screw is rotated, the moving distances of the two bones are different, and the moving distance on the narrow-distance thread section 2 is smaller than that on the wide-distance thread section 3, so that the two bones are pressed and squeezed tightly, and the bone section can approach to promote bone healing.

During the use, go into the skeleton with a self tapping pressurization pedicle of vertebral arch screw from the hole knob after punching target skeleton for wide range screw section 3 is in a cracked bone, narrow range screw section 2 is in another cracked bone, and two skeleton sections are the laminating, reverse knob screw, because two cracked bones are in the region of different screw pitches, therefore when the screw is rotatory, two skeleton motion's distance is different, the distance of motion on the narrow range screw section is less than the distance of motion on the wide range screw section, consequently two bones are crowded tightly by the pressurization, make the bone section approach and promote bone healing.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to 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 utility model. In this specification, the schematic representations of the terms used above do not necessarily refer 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.

The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a self tapping pressurization pedicle of vertebral arch screw, includes U-shaped cap, narrow pitch screw section and wide pitch screw section, its characterized in that: the left end of the narrow-distance threaded section is connected with the wide-distance threaded section, a section of thread-free section is arranged between the narrow-distance threaded section and the wide-distance threaded section, the right end of the narrow-distance threaded section is connected with the U-shaped cap, and the U-shaped cap, the narrow-distance threaded section and the wide-distance threaded section are integrally formed.

2. A self-tapping compression pedicle screw as claimed in claim 1, wherein the thread pitch of the thread in the narrow thread section is smaller than the thread pitch of the thread in the wide thread section, and the unthreaded section has a length of 3 to 8 mm.

3. The self-tapping compression pedicle screw as claimed in claim 1, wherein the wide threaded section is provided with a self-tapping drill hole at a proximal tip thereof.

4. The self-tapping compression pedicle screw as claimed in claim 1, wherein the narrow thread section and the wide thread section are formed such that the whole of the narrow thread section and the wide thread section has a diameter gradually decreasing from a right to a left cross-sectional circle.