CN2601636Y - Distensible and contractile screw for pedicle of vertebral arch - Google Patents
Distensible and contractile screw for pedicle of vertebral arch Download PDFInfo
- Publication number
- CN2601636Y CN2601636Y CN 03235808 CN03235808U CN2601636Y CN 2601636 Y CN2601636 Y CN 2601636Y CN 03235808 CN03235808 CN 03235808 CN 03235808 U CN03235808 U CN 03235808U CN 2601636 Y CN2601636 Y CN 2601636Y
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- China
- Prior art keywords
- screw
- pedicle screw
- cavity
- utility
- model
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides an expanding type pediculus arcus vertebrae screw, which is characterized in that the device comprises a hollow type pediculus arcus vertebrae screw (1) with connection spiral markings arranged on the inner and lateral wall and a expanding screw core (2) which is screw arranged inside the hollow cavity of the hollow type pediculus arcus vertebrae screw. The lower segment of the hollow cavity of the hollow type pediculus arcus vertebrae screw (1) is a cavity with endocone structure, and at least three expanding crevices (4) that perpendicularly extend downward are arranged on the cavity wall of the cavity. The utility model has the advantages that the laxation and shedding of the pediculus arcus vertebrae screw after operation can be effectively prevented by increasing the tensile resistance and the hold capability of the screw.
Description
(1) technical field
This utility model relates to a kind of medical apparatus and instruments, relates to a kind of spinal fracture, malformation correction of being used for the treatment of specifically, is particularly useful for the expansion chuck pedicle screw of operative reductions such as spondylolysis.
(2) background technology
The appearance of pedicle screw is that spinal surgery has opened brand-new one page, because its adopts pedicle to enter vertebral body, also just can control " three posts " composite construction of spinal column and strong internal fixation is provided.Its influence can be rated as the revolution of spinal surgery.At present, pedicle screw has been widely used in field of spinal surgery, and technology is also day by day ripe.But cause becoming flexible, deviate to make operative failure and produce other severe complications person and also happening occasionally of screw owing to the pedicle screw stretching resistance is not enough.Especially in the operation of correcting spondylolishesis, pedicle screw often needs the bigger power that lifts of load, and the insufficient problem of its stretching resistance is just outstanding to show outstanding, has become urgent problem.
(3) summary of the invention
The purpose of this utility model is just at existing weak point in the above-mentioned prior art, and the expansion chuck that a kind of stretching resistance is strong, hold is big pedicle screw is provided.
The purpose of this utility model can realize by following measure:
Expansion chuck pedicle screw of the present utility model comprises the open-core type pedicle screw that all is processed with connecting thread on its inside and outside wall, and the swelling spiral shell core of spinning in open-core type pedicle screw hollow cavity; The hypomere of described open-core type pedicle screw hollow cavity is the cavity of interior wimble structure, and is processed with at least three spalling seams that extend straight down on the wall of the chamber of this section cavity.
Bloated fissured nearly root described in this utility model is processed with the through hole that is easy to spalling.
Operation principle of the present utility model and advantage are as follows:
A, when using pedicle screw of the present utility model to correct the spondylolishesis operation, the pre-position will be arrived earlier on the pedicle screw, progressively tighten swelling spiral shell core afterwards again, it is slowly moved forward, and then the three lobe bodies that are divided into by three spallings seams that extend straight down that are arranged on the pedicle screw hypomere are extruded under the effect at swelling spiral shell core open gradually.And be positioned at spongy bone around the screw front end under the support expansive force effect of the extruding of screw and three lobe bodies by tightly being held on the pedicle screw, this has just greatly increased sclerotin to the hold of screw and the stretching resistance of screw, has reduced the stress burden of pedicle of vertebral arch simultaneously again relatively.
B, because the location of pedicle screw and advance nail require very accurate, so in prior art in the past in case advance to follow closely the mistake of position skew, behind the nail pulling once more installation just can reduce the fixation of screw greatly.And when using screw of the present utility model, can not tighten swelling spiral shell core earlier, it is firm fixing by the method that tightens swelling spiral shell core the screw of reinstalling after the adjustment to be able to again after treating that screw is correct and installing.
C, since pedicle screw of the present utility model be hollow-core construction, in operation process, can adopt fine steel needle to position earlier as guide pin, and according to film making in the art in time adjust the inserting needle direction to the appropriate position again with the pedicle screw precession, take out guide pin afterwards, the swelling spiral shell core and it is tightened to finish operation technique of packing into.This has just improved disposable success rate of advancing to follow closely greatly, and making into, the accuracy and the safety of nail are able to great raising.
(4) description of drawings
Accompanying drawing is a front view of the present utility model.
(5) specific embodiment
This utility model is further described below with reference to embodiment (accompanying drawing):
As shown in the figure, expansion chuck pedicle screw of the present utility model comprises the open-core type pedicle screw 1 that all is processed with connecting thread on its inside and outside wall, and the swelling spiral shell core 2 of spinning in open-core type pedicle screw hollow cavity; The hypomere of described open-core type pedicle screw 1 hollow cavity is the cavity of interior wimble structure, and on the wall of the chamber of this section cavity, be processed with three spalling seams 4 that extend straight down, and this section screw is partitioned into three lobe body structures by these three spallings seams that extend straight down 4, for ease of the spalling of three lobe bodies, this utility model is processed with the through hole 3 that is easy to spalling at the nearly root place of spalling seam 4 (going up initiating terminal).
Claims (2)
1, a kind of expansion chuck pedicle screw is characterized in that: it comprises the open-core type pedicle screw (1) that all is processed with connecting thread on its inside and outside wall, and the swelling spiral shell core (2) of spinning in open-core type pedicle screw hollow cavity; The hypomere of described open-core type pedicle screw (1) hollow cavity is the cavity of interior wimble structure, and is processed with at least three spalling seams (4) that extend straight down on the wall of the chamber of this section cavity.
2, expansion chuck pedicle screw according to claim 1 is characterized in that: the nearly root at described spalling seam (4) is processed with the through hole (3) that is easy to spalling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03235808 CN2601636Y (en) | 2003-03-11 | 2003-03-11 | Distensible and contractile screw for pedicle of vertebral arch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03235808 CN2601636Y (en) | 2003-03-11 | 2003-03-11 | Distensible and contractile screw for pedicle of vertebral arch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2601636Y true CN2601636Y (en) | 2004-02-04 |
Family
ID=34166483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03235808 Expired - Fee Related CN2601636Y (en) | 2003-03-11 | 2003-03-11 | Distensible and contractile screw for pedicle of vertebral arch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2601636Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384386C (en) * | 2005-12-15 | 2008-04-30 | 孙海飚 | Anti-loosen conal arch root screw |
| CN100384385C (en) * | 2005-12-15 | 2008-04-30 | 孙海飚 | Anti-loosen cervical vertebrae anterior screw |
-
2003
- 2003-03-11 CN CN 03235808 patent/CN2601636Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384386C (en) * | 2005-12-15 | 2008-04-30 | 孙海飚 | Anti-loosen conal arch root screw |
| CN100384385C (en) * | 2005-12-15 | 2008-04-30 | 孙海飚 | Anti-loosen cervical vertebrae anterior screw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |