KR20130096580A

KR20130096580A - Screw for fixing vertebra

Info

Publication number: KR20130096580A
Application number: KR1020120018146A
Authority: KR
Inventors: 최욱조; 황재원
Original assignee: (주)원앤온리메디칼
Priority date: 2012-02-22
Filing date: 2012-02-22
Publication date: 2013-08-30

Abstract

The present invention relates to a screw for spinal fixation, the screw portion being formed to be screwed into the vertebrae fixed; And a head part formed at one end of the screw part to fix a connecting rod connecting the vertebrae, wherein the screw part has equal intervals along the circumferential direction at a tip portion opposed to the head part. It is configured to form more than one chip discharge groove, so that the chip discharge generated in the process of fixing the screw for fixing the spine to the vertebrae for the pedicle screw insertion procedure is made easier and more precise in the position to be treated It has the effect of being able to fix it.

Description

Spinal fixation screw {SCREW FOR FIXING VERTEBRA}

The present invention relates to a screw for spinal fixation, and more particularly, to a screw for spinal fixation to more easily discharge the chip generated in the process of fixing the screw thread formed on the vertebrae.

In general, spinal diseases include disc herniation (vertebral discs), scoliosis, etc., patients with damaged parts of the spine are unable to perform activities necessary for personal life in that state, and even if the degree of injury is not severe, Uneven division of the load imparted to the human body to other adjacent parts may cause pain or lead to degeneration.

Therefore, a part of the spine is damaged or injured, the patient will be able to live comfortably only by performing surgery to support the damaged part using artificial prostheses.

Among the above spinal diseases, scoliosis is a disease in which the vertebral bones are bent and twisted. In case of scoliosis, if left unchanged, the deformation of the spine continues and eventually causes severe malformation. Can be.

The scoliosis can be cured by wearing a brace or surgery depending on the angle of the spine bones. Recently, pedicle screw insertion is commonly used to correct scoliosis by inserting screws into curved vertebrae.

The pedicle screw insertion method is to fix the vertebrae fixation screw to the curved vertebrae, and to connect the respective vertebral fixation screws to each other using a connecting rod to help the vertebrae return to a normal state.

Therefore, the fixing operation must be preceded by precisely driving and fixing the screw portion of the screw for fixing the spine at the correct position to be treated by the vertebrae.

However, in the case of the conventional pedicle screw fixation screw used in the pedicle screw insertion surgery because the chip is not easily made during the fixation of the screw portion embedded in the vertebrae not only makes the fixing work difficult, but also does not exactly fit in the set position There is a problem such as a deviation from the fixed position.

An object of the present invention for solving the above problems, to provide a spinal fixing screw that can be more easily discharged chip in the process of fixing the screw portion of the screw for spinal fixation in the vertebrae.

Spinal fixing screw of the present invention for achieving the above object, the screw portion is formed to be screwed into the vertebrae fixed; And a head part formed at one end of the screw part to fix a connecting rod connecting the vertebrae, wherein the screw part has equal intervals along the circumferential direction at a tip portion opposed to the head part. It is characterized in that more than one chip discharge groove is formed.

Here, each of the chip discharge grooves preferably have the same shape to be formed symmetrically with respect to the horizontal center line on the cross section of the same height.

In addition, each of the chip discharge grooves are preferably formed with the same height from the tip of the screw portion.

In addition, each of the chip discharge grooves are formed to have a different height from the tip of the screw portion, it is preferable that the screw portion is formed sequentially higher along the rotational direction is fixed.

In addition, the head portion is a bolt insertion groove formed with a female screw portion on the inner circumferential surface to be fixed to the fixing bolt is inserted into the inner center from the top; And a rod insertion groove penetrating both sides of the side wall surfaces of the bolt insertion grooves facing each other and being opened to a predetermined depth from an upper end portion so that the connection rod is inserted and fixed by the fixing bolt.

According to the screw for spinal fixation of the present invention, a plurality of chips in the process of fixing at least two chip discharge grooves in the screw tip of the spinal screw to fix the screw portion of the spinal screw to the vertebrae By discharging the chip easily through the discharge holes has an effect that can be more easily fixed to the spinal fixing screw in the correct position to be treated.

1 is an exploded perspective view showing a device for fixing a spine.
2 is a side view of the screw for spinal fixation according to the first embodiment of the present invention.
FIG. 3 is a side cross-sectional view of the screw for the lumbar spine viewed along the line III-III of FIG. 2.
Figure 4 is a side view of the screw for spinal fixation according to the second embodiment of the present invention.
5 is a side cross-sectional view of the screw for spinal fixation taken along the line VV of FIG. 3.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 is an exploded perspective view showing a device for fixing a spine.

Referring to FIG. 1, the device for fixing a spine 1 used in pedicle screw insertion includes a screw 10, a fixing bolt 20, and a connecting rod 30.

The device for spinal fixation (1) is fixed by driving a pair of spinal fixing screws (10) to the vertebrae of the patient, and then connected to the connecting rod insertion groove (17) of the fixed spinal fixing screws (10) Insert both ends of the (30), tightening with a fixing bolt 20 to maintain a constant distance between the vertebrae to be fixed by the connecting rod (30).

2 is a side view of the screw for spinal fixation according to the first embodiment of the present invention.

Referring to Figure 2, the spinal fixing screw 10 of the present embodiment consists of a screw portion 11 and the head portion 15.

The screw portion 11 is formed with a screw line 12 along the outer circumferential surface from the lower tip to be firmly fixed to the vertebrae for the procedure of pedicle screw insertion.

In particular, at least two chip discharge grooves 13 are formed in the tip portion of the screw portion 11 along the circumferential direction.

The chip discharge grooves 13 will be described in more detail below with reference to FIG. 3, which will be described later in conjunction with FIG. 2.

The head portion 15 is integrally formed at the upper end of the screw portion 11 so as to be inserted into the connecting rod 30 so as to be held between the vertebrae to which the spinal fixation screw 10 is embedded and fixed. It is formed to be.

In this embodiment, the fixing bolt fastening groove 16 and the connecting rod insertion groove 17 for fixing the connecting rod 30 are formed on the upper side of the head part 15.

The fixing bolt fastening groove 16 is formed in the inner center from the upper end of the head portion 15, female screw for screwing the fixing bolt 20 so that the inner circumferential surface can be fixed by tightening the connecting rod 30 The portion 18 is formed to correspond to the male screw portion 21.

The connection rod insertion groove 17 penetrates both wall surfaces of the fixing bolt coupling groove 16 facing each other and is open to a predetermined depth from an upper end portion to which the connection rod 30 is fitted.

As such, the spinal fixing screw 10 of the present exemplary embodiment illustrates that the fixing bolt fastening groove 16 and the connecting rod inserting groove 17 are formed to fix the connecting rod 30 to the head 15. However, the present invention is not necessarily limited thereto, and the head part 15 may include both of the fixing bolt fastening grooves and the connection rod insertion grooves to which a separate fastening nut is inserted to be rotatably fixed. Of course it is.

FIG. 3 is a side cross-sectional view of the screw for the lumbar spine viewed along the line III-III of FIG. 2.

Referring to FIG. 2 together with FIG. 2, the chip discharge groove 13 in the present embodiment maintains equal intervals along the circumferential direction at the lower tip of the threaded portion 11 and is disposed between them on the same height in cross section. For example, it is formed to be symmetrical to both sides with respect to the horizontal center line (CC) passing.

However, the spinal fixation screw of the present invention is not necessarily limited to having two chip discharge grooves 13 and may include both at least two chip discharge grooves formed along the circumferential direction.

As such, by forming at least two chip discharge grooves 13a and 13b having a height established at the tip of the screw portion 11, the screw for fixing the spine 10 to the vertebrae for pedicle screw insertion is performed. Easily discharge the chips generated during the fixing process.

As the chip is easily discharged through the chip discharge grooves 13a and 13b, the chip fixing screw 10 can be easily driven and fixed, and more precisely, the chip discharge grooves 13a and 13b can be fixed to the fixed position.

Hereinafter, the spinal fixation screw 10 according to the second embodiment of the present invention will be described with reference to the accompanying drawings, and the same and similar components as those of the first embodiment will be denoted by the same reference numerals and repeated therewith. Description is omitted.

4 is a side view of the screw for spinal fixation according to the second embodiment of the present invention, and FIG. 5 is a side cross-sectional view of the screw for spinal fixation taken along the line VV of FIG. 3.

Referring to Figures 3 and 4, the spinal fixing screw 50 of the present embodiment, compared with the spinal fixing screw 10 of the first embodiment described above, the chip discharge groove 53 is a screw portion 11 The same spaces along the circumferential direction of the tip portion of the) has a difference in configuration formed of three different heights.

Here, the three chip discharge grooves (53a, 53b, 53c) are formed to have different heights (h1, h2, h3), respectively, to illustrate that the height is sequentially increased along the direction of rotation of the screw portion (11) .

As such, the chip discharge grooves 53a, 53b, and 53c are formed with different heights h1, h2, and h3 along the circumferential direction, so that the spinal fixation screw 50 is rotated and fixed to the vertebrae. The spinal fixation screw 50 is embedded in the vertebrae in the process so that even the last generated chip can be easily discharged.

Therefore, the screw for fixing the spine 50 of the present embodiment is fixed to be precisely inlaid in the precise position to be treated by making the chip ejection in the process of fixing the screw 10 to the vertebrae to be fixed. To help.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. In addition, it is natural that it belongs to the scope of the present invention.

1: spine fixing device 10, 50: spinal screw
11: thread 12: thread
13, 53: chip discharge groove 15: head portion
16: Fixing bolt fastening groove 17: Extension rod insertion groove
18: female thread 20: fixing bolt
21: male thread portion 30: connection rod

Claims

Screw portion is formed in the screw thread is fixed to the vertebrae; And
And a head part formed at one end of the screw part to fix a connection rod connecting the vertebrae.

Wherein,
Spinal fixing screw is formed at least two or more chip discharge grooves at equal intervals in the circumferential direction at the tip portion opposed to the head portion.

In claim 1,
Each of the chip discharge grooves,
Spinal fixation screw is formed symmetrically with respect to the horizontal center line on the cross section of the same height relative to the tip of the screw portion.

In claim 1,
Each of the chip discharge grooves,
Spinal fixing screw is formed with the same height from each other from the tip of the screw portion.

In claim 1,
Each of the chip discharge grooves,
Spinal fixing screw is formed having a different height from the tip of the screw portion.

5. The method of claim 4,
The chip discharge grooves,
Spinal fixing screw is formed to sequentially increase in height along the rotational direction in which the screw portion is embedded.

In claim 1,
Wherein:
A fixing bolt fastening groove in which an internal thread is formed on an inner circumferential surface of the fixing bolt to be fixed to the inner center from an upper end thereof; And
And a connection rod insertion groove penetrating both sides of the side wall surfaces of the bolt insertion grooves facing each other, the connection rod being inserted and opened to a predetermined depth from an upper end portion to be fixed by the fixing bolt.