CN204446085U - The hollow Universal pedicle screw of two pitch airscrew - Google Patents

Abstract

A double-pitch hollow universal pedicle screw includes a screw body and a screw head, threads are arranged on the outer peripheral surface of the screw body, the screw head is arranged on one side of the screw body, and the same thread on the screw body has two different pitches. In the double-pitch hollow universal pedicle screw of the present invention, the proximal and distal ends of the screw are of different pitches, which can have the best fixation strength in the bone or the bone with a hard cortical outer area and a soft cancellous inner area. , to resolve the screw stress to the greatest extent, enhance the pull-out resistance, the screw body is equipped with a hollow hole, and the guide pin is used as a guide to accurately screw the screw into the vertebral body through the pedicle, and help maintain the drilling; prevent The screw loosens and slides, and the screw can be accurately screwed into the vertebral body through the pedicle to reduce the difficulty of operation and improve the treatment effect.

Description

Double pitch hollow universal pedicle screw

technical field

The utility model belongs to the technical field of orthopedic medical and surgical instruments, in particular to a double-pitch hollow universal pedicle screw.

Background technique

At present, pedicle screws can be used as an important means of treatment in spinal trauma, bone lesions or deformity correction. Pedicle screws are the most commonly used internal fixation equipment for the treatment of the spine at home and abroad. The existing pedicle screws are roughly the same, and they are prone to loosening and slipping of the screws, causing the internal fixation system to bend and break, and the screw implantation is not accurate, which affects the Surgical quality or surgical failure.

Contents of the invention

The purpose of this utility model is to provide a double-pitch hollow universal pedicle screw aimed at the deficiencies of the above-mentioned prior art.

The technical scheme that the utility model takes for solving the technical problem existing in the known technology is:

The double-pitch hollow universal pedicle screw of the present invention includes a screw body and a screw head. Threads are arranged on the outer peripheral surface of the screw body, and the screw head is arranged on one side of the screw body. The same screw thread on the screw body has two different types. pitch.

The utility model can also adopt the following technical measures:

The thread pitch on the side of the screw body close to the nail head is smaller than the thread pitch on the side away from the nail head.

The screw body is a hollow structure.

The advantages and positive effects that the utility model has are:

In the double-pitch hollow universal pedicle screw of the present utility model, the proximal and distal ends of the screw have different pitches, and are equipped with hollow holes, and the guide pin is used as a guide to accurately screw the screw into the vertebral body through the pedicle, and it helps To maintain the drill hole; prevent screw loosening, slippage, and accurately screw the screw into the vertebral body through the pedicle, can be in bone or bone with a harder cortical outer area and a softer cancellous inner area Optimum fixation strength, maximum decomposition of screw stress, enhanced pull-out resistance, to reduce the difficulty of operation and improve the treatment effect.

Description of drawings

Fig. 1 is a schematic diagram of the double-pitch hollow universal pedicle screw of the present invention.

Detailed ways

The double-pitch hollow universal pedicle screw of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, the double-pitch hollow universal pedicle screw of the present invention includes a screw body 1 and a screw head 2, threads are arranged on the outer peripheral surface of the screw body, and the screw head is arranged on one side of the screw body, and on the screw body The same thread has two different pitches.

It can be seen from the figure that the pitch of the thread 3a on the side of the screw body close to the nail head is smaller than the pitch of the thread 3b on the side away from the nail head. Two different pitch threads correspond to bone or bone with hard cortical outer area and soft cancellous inner area, so the screw body has corresponding fixation strength for different areas, and the screw stress can be resolved to the greatest extent, so that the fixation more solid.

The screw body is a hollow structure (not shown in the figure). A hollow hole coaxial with the screw body is set on the screw body. The hollow hole runs through the screw body. Guided by the guide pin, the screw can be accurately screwed into the vertebral body through the pedicle .

The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above with the preferred embodiment, however, it is not used to limit the utility model. Any skilled person familiar with this profession, without departing from the scope of the technical solutions of the present utility model, will of course use the disclosed technical content to make some changes or modifications to become equivalent embodiments with equivalent changes, but all without departing from the technical solutions of the present utility model The content of the scheme, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model all belong to the scope of the technical solution of the utility model.

Claims (3)

1. A double-pitch hollow universal pedicle screw, comprising a screw body and a screw head, threads are set on the outer peripheral surface of the screw body, and the screw head is arranged on one side of the screw body, and it is characterized in that the same thread on the screw body Available in two different pitches. 2 . The double-pitch hollow universal pedicle screw according to claim 1 , wherein the pitch of the thread on the side of the screw body close to the screw head is smaller than the pitch of the thread on the side away from the screw head. 3 . 3. The double-pitch hollow universal pedicle screw according to claim 1, wherein the screw body is a hollow structure.