CN210354876U - Minimally invasive joint fusion screw applied to cervical vertebra articular process - Google Patents
Minimally invasive joint fusion screw applied to cervical vertebra articular process Download PDFInfo
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- CN210354876U CN210354876U CN201920749059.9U CN201920749059U CN210354876U CN 210354876 U CN210354876 U CN 210354876U CN 201920749059 U CN201920749059 U CN 201920749059U CN 210354876 U CN210354876 U CN 210354876U
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- screw
- fixed part
- minimally invasive
- thread
- arthrodesis
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Abstract
The utility model provides a be applied to articular screw of wicresoft of cervical vertebra articular process, the articular screw of wicresoft includes at least: the nail body and the nail tail that link to each other, the nail body is including consecutive first fixed part, connecting portion and second fixed part, the second fixed part with the nail tail is connected, the lateral wall of first fixed part and second fixed part all is equipped with the screw thread, the threaded thread height of second fixed part with the threaded thread height of first fixed part is the same, the threaded thread's of second fixed part longitudinal section area is greater than the threaded thread's of first fixed part longitudinal section area. The implant can be smoothly implanted into a vertebral body, is more firmly connected with vertebral compact bone, and increases the holding force of a screw; the bone growth crawling is facilitated, the fusion of the bone and the screw is promoted, the screw is effectively prevented from loosening, and therefore the holding force is increased.
Description
Technical Field
The utility model belongs to the technical field of the joint of wicresoft cervical vertebra articular process fuses, especially, relate to a be applied to articular process of wicresoft's joint of cervical vertebra and fuse screw.
Background
Patients with severe symptoms of lower cervical vertebra injury and cervical canal stenosis often need surgical treatment, and minimally invasive surgery is increasingly applied to surgery due to the advantages of small bleeding amount, short healing time and the like. The zygapophyseal joint is an important part for determining the stability of cervical vertebra and has a decisive influence on the success or failure of the operation.
The existing minimally invasive joint fusion screw is not easy to rebuild the stability of the cervical vertebra due to screw loosening after operation, and the uncertainty of postoperative rehabilitation is increased.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings of the prior art, an object of the present invention is to provide a minimally invasive arthrodesis screw applied to cervical spondyloarthropathy for solving the problem of the loosening of the minimally invasive arthrodesis screw in the prior art, and improving the holding force of the screw.
In order to achieve the above objects and other related objects, the present invention provides a minimally invasive joint fusion screw for cervical spondyloarthropathies, the minimally invasive joint fusion screw comprising at least: the nail body and the nail tail that link to each other, the nail body is including consecutive first fixed part, connecting portion and second fixed part, the second fixed part with the nail tail is connected, the lateral wall of first fixed part and second fixed part all is equipped with the screw thread, the threaded thread height of second fixed part with the threaded thread height of first fixed part is the same, the threaded thread's of second fixed part longitudinal section area is greater than the threaded thread's of first fixed part longitudinal section area.
The minimally invasive joint fusion screw applied to the cervical vertebra articular process can be connected with the cervical vertebra articular process. The first fixing part is fixed on cancellous bone after being implanted into the cervical vertebra, and the second fixing part is contacted with the cervical vertebra after being implanted into the cervical vertebra.
As mentioned above, the utility model discloses a be applied to wicresoft's joint fusion screw of cervical joint process has following beneficial effect: the minimally invasive joint fusion screw applied to the cervical vertebra articular process can be smoothly implanted into a vertebral body, is more firmly connected with vertebral body compact bone, and has high holding force; the phenomena that the screw is difficult to place and the screw does not reach the preset position and is clamped are avoided, the bone growth and crawling are facilitated, the fusion of the bone and the screw is promoted, the screw is effectively prevented from loosening, and therefore the holding force is increased.
Drawings
Fig. 1 is a schematic view of the overall structure of a minimally invasive arthrodesis screw applied to a cervical vertebra articular process according to an embodiment of the present invention.
Fig. 2 is a schematic view of another side of a minimally invasive arthrodesis screw for cervical processes according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view of a minimally invasive arthrodesis screw for application to a cervical spine in an embodiment of the invention.
Fig. 4 is a partially enlarged view of a cross-sectional view of a minimally invasive arthrodesis screw for application to a cervical spinous process according to an embodiment of the present invention.
Description of the element reference numerals
1 nail body
11 first fixed part
111 thread of first fixing part
12 second fixed part
121 second fixing part thread screw thread
13 connecting part
131 through hole
2 nail tail
21 fastening groove
3 hollow cavity
a central axis of nail body
S1 longitudinal cross-sectional area of thread of first fixing part thread
S2 longitudinal cross-sectional area of thread of second fixing part thread
h1 thread height of first anchor thread
h2 thread height of second anchor thread
D thread outside diameter
L1 first anchor thread pitch
L2 second Anchor thread Pitch
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1 to 4. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
As shown in fig. 1 and 2, the utility model provides a be applied to little invasive joint fusion screw of cervical vertebra articular process, little invasive joint fusion screw includes at least: the nail comprises a nail body 1 and a nail tail 2 which are connected, wherein the nail body 1 comprises a first fixing part 11, a connecting part 13 and a second fixing part 12 which are sequentially connected, the second fixing part 12 is connected with the nail tail 2, the outer side walls of the first fixing part 11 and the second fixing part 12 are both provided with threads, as shown in fig. 4, the height h2 of a thread 121 of the second fixing part thread is the same as the height h1 of a thread 111 of the first fixing part thread, namely h1 is h2, as shown in fig. 3, and the longitudinal section area S2 (the area of a shaded part in a dotted line frame line) of the thread 121 of the second fixing part thread is larger than the longitudinal section area S1 (the area of a shaded part in a dotted line frame line) of the thread 111 of the first fixing part thread. The longitudinal section of the screw thread is a section obtained by cutting a single screw thread protrusion through the surface of the central axis a of the nail body. The first fixing part has uniform longitudinal cross-sectional area of the screw teeth, and the second fixing part has uniform longitudinal cross-sectional area of the screw teeth.
The thread refers to the part of the thread protruding out of the side wall of the nail body.
The minimally invasive joint fusion screw applied to the cervical vertebra articular process can be connected with the cervical vertebra articular process. The first fixing part 11 is fixed on cancellous bone after being implanted into the cervical vertebra, and the second fixing part 12 is contacted with the compact cervical vertebra after being implanted into the cervical vertebra.
The utility model discloses be applied to cervical vertebra apophysis's wicresoft joint fusion screw sets up the screw thread because of first fixed part 11 for the screw can smoothly implant the centrum, simultaneously, second fixed part threaded thread 121 with first fixed part threaded thread 111 height-alike, the longitudinal section area of second fixed part threaded thread 121 is greater than the longitudinal section area of first fixed part threaded thread 111 makes second fixed part 12 screw thread thickness is greater than first fixed part 11 screw thread thickness makes after the nail body 1 reachs the preset position, can guarantee that second fixed part 12 increases with the contact volume of centrum bone dense to avoid the screw to rock, and then increase the power of controlling of whole screw.
Furthermore, the minimally invasive joint fusion screw comprises a hollow cavity 3 which is communicated in the direction from the screw body to the screw tail, and two ends of the hollow cavity 3 are opened. The screw can be sleeved into the Kirschner wire before the screw is placed, so that the screw placing direction and the position of the screw are accurate, and meanwhile, in the screw placing process, bone fragments can be discharged along the hollow cavity, and the resistance in the screw placing process is reduced.
In one embodiment, as shown in FIG. 3, the first anchoring portion 11 has a major diameter D that is the same as the major diameter D of the second anchoring portion 12. In the process of screwing the screw, the phenomena of difficult screw placement and screw clamping caused by the radial size change of the screw body 1 are reduced.
In one embodiment, as shown in fig. 3, the thread pitch L1 of the first fastening portion 11 is the same as the thread pitch L2 of the second fastening portion 12, i.e., L1 is L2. In the process that the nail body 1 reaches the preset position, the screw is implanted into the vertebral body at a certain stepping speed, so that the phenomenon that the stress is suddenly changed to damage the compact bone due to different thread pitches is avoided.
In one embodiment, the connecting portion 13 has a diameter smaller than the root diameter of the first fixing portion 11. The connecting part diameter refers to the outer diameter of the connecting part. In the process of screw setting, the phenomena that the screw setting is difficult and the screw does not reach the preset position to be clamped due to the sudden change of the thickness of the thread teeth of the second fixing part can be avoided.
Thread root diameter-1.08252 pitch
In one embodiment, the connecting portion 13 has a diameter smaller than the base diameter of the second fixing portion 12. The connecting part diameter refers to the outer diameter of the connecting part. In the process of screw setting, the phenomena that the screw setting is difficult and the screw does not reach the preset position to be clamped due to the sudden change of the thickness of the thread teeth of the second fixing part can be avoided.
In one embodiment, the side wall of the connecting portion 13 is provided with a through hole 131. The bone growth promoting screw is used for enabling the bone to grow in the through hole and promoting the bone to be fused with the screw.
Further, the through hole 131 is communicated with the hollow cavity 3.
In use, bone growth promoting drugs, such as: bone morphogenesis protein BMP and the like enables bones to grow into the connecting part 13 along the through holes 131, fusion of the bones and the screws is promoted, the screws are effectively prevented from loosening, and holding force is increased.
In one embodiment, the connection portion 13 has a surface roughness Ra greater than 1.6 microns. The bone growth crawling is facilitated, the fusion of the bone and the screw is promoted, the screw is effectively prevented from loosening, and the holding force is increased.
And a fastening groove 21 is formed on the outer side of the nail tail 2. For use in implanting a screw, torque is applied to the screw to drive the screw in.
The diameter of the nail tail 2 is larger than that of the nail body 1.
When the minimally invasive joint fusion screw is used, the Kirschner wire is placed into the hollow cavity 3, and the minimally invasive joint fusion screw is screwed into a bone.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A minimally invasive arthrodesis screw for application to a cervical spine, the minimally invasive arthrodesis screw comprising at least: the continuous nail body (1) and the nail tail (2), the nail body (1) is including consecutive first fixed part (11), connecting portion (13) and second fixed part (12), second fixed part (12) with nail tail (2) are connected, the lateral wall of first fixed part (11) and second fixed part (12) all is equipped with the screw thread, second fixed part threaded thread (121) height with first fixed part threaded thread (111) height is the same, the longitudinal section area of second fixed part threaded thread (121) is greater than the longitudinal section area of first fixed part threaded thread (111).
2. The minimally invasive joint fusion screw applied to the cervical vertebra articular process according to claim 1, characterized in that the minimally invasive joint fusion screw comprises a hollow cavity (3) which is through in the direction from the screw body to the screw tail, and the hollow cavity (3) is open at two ends.
3. The minimally invasive arthrodesis screw for application to a cervical facet joint according to claim 1, wherein the first fixation section (11) has the same external threaded diameter as the second fixation section (12).
4. The minimally invasive arthrodesis screw for application to a cervical facet joint according to claim 1, characterized in that the thread pitch of the first fixation portion (11) is the same as the thread pitch of the second fixation portion (12).
5. The minimally invasive arthrodesis screw for application to a cervical facet joint according to claim 1, wherein the connecting portion (13) has a diameter smaller than a bottom diameter of the first fixation portion (11).
6. The minimally invasive arthrodesis screw for application to a cervical facet joint according to claim 1, wherein the connecting portion (13) has a diameter smaller than the bottom diameter of the second fixation portion (12).
7. The minimally invasive arthrodesis screw for application to a cervical vertebra according to claim 2, characterized in that the side wall of the connection portion (13) is provided with a through hole (131).
8. The minimally invasive arthrodesis screw for application to a cervical vertebra according to claim 7, characterized in that the through hole (131) communicates with the hollow cavity (3).
9. The minimally invasive arthrodesis screw for application to a cervical vertebra according to claim 1, characterized in that the connecting portion (13) has a surface roughness greater than 1.6 microns.
10. The minimally invasive arthrodesis screw applied to the cervical processes according to claim 1, characterized in that the nail tail (2) is provided with a fastening groove (21) on the outer side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920749059.9U CN210354876U (en) | 2019-05-23 | 2019-05-23 | Minimally invasive joint fusion screw applied to cervical vertebra articular process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920749059.9U CN210354876U (en) | 2019-05-23 | 2019-05-23 | Minimally invasive joint fusion screw applied to cervical vertebra articular process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210354876U true CN210354876U (en) | 2020-04-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920749059.9U Active CN210354876U (en) | 2019-05-23 | 2019-05-23 | Minimally invasive joint fusion screw applied to cervical vertebra articular process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210354876U (en) |
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2019
- 2019-05-23 CN CN201920749059.9U patent/CN210354876U/en active Active
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