CN201958992U - Pressurized injection universal vertebral pedicle screw - Google Patents
Pressurized injection universal vertebral pedicle screw Download PDFInfo
- Publication number
- CN201958992U CN201958992U CN2011200522978U CN201120052297U CN201958992U CN 201958992 U CN201958992 U CN 201958992U CN 2011200522978 U CN2011200522978 U CN 2011200522978U CN 201120052297 U CN201120052297 U CN 201120052297U CN 201958992 U CN201958992 U CN 201958992U
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- screw
- hole
- pedicle screw
- vertebral pedicle
- head
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Abstract
The utility model provides a pressurized injection universal vertebral pedicle screw which belongs to the field of a medical appliance. A screw head (1) is embedded into the concave circular arc-shaped surface at the lower end of a U-shaped connecting piece (7), an internally-hexagonal sunken hole (6) is arranged at the top end of the screw head (1), a run-through lower U-shaped groove hole (5) is arranged at the lower end of the middle lower part of a screw rod, an upper circular hole (3) is arranged at the right side of the U-shaped groove hole (5), and a middle oval hole (4) is arranged at the position (lower than the upper circular hole (3) by a screw pitch L) of the left side of the U-shaped groove hole (5). The pressurized injection universal vertebral pedicle screw has the following characteristics: the distributing range of holes injected with bone cement is wide, the holding force of a bone-screw interface is large, the fixing of the screw is firm, the leakage of the bone cement can be effectively avoided, and the effect of obviously enhancing the stability of the vertebral pedicle screw can be achieved.
Description
Technical field
This utility model relates to medical apparatus and instruments, especially a kind of universal pedicle screw that can be used for vasopressing injection.
Background technology
The world population aging causes patients with osteoporosis more and more, needs increasing with osteoporotic disease is also corresponding of row internal fixation of spine.The loosening rate of pedicle screw fixation is between 0.6%～11% in the Essens research prompting osteoporosis centrum.For osteoporotic vertebral body, the vertebral body bone density reduces, and bone trabecula is thinning to be dredged, the cortex attenuation, pedicle screw reduces the hold of vertebral body will cause a series of complication, for example the becoming flexible of pedicle screw, extract, fracture etc.Row is inserted again or revision procedure need be taken out former screw and inserted new screw, and the internal fixation effect of pedicle screw will be weakened or be caused forming pseudarthrosis, and this gives patient's spirit and animally brings misery, and the while brings burden economically.Therefore, how improving osteoporosis centrum pedicle screw fixation stability is the challenge greatly that spinal surgery faces.
The reliability of pedicle screw fixation depends on keeping of bone-screw interface hold.In order to increase the intensity of pedicle screw fixation, many diverse ways are applied in clinical.1. increase the length and the diameter of screw; 2. utilize bone material to fill the nail road; 3. in the nail road, put into bone cement before being screwed into pedicle screw; 4. use the hollow screw of injectable bone cement.2. 1. the method that studies show that improve the effect of stability and not obvious, and exist pedicle of vertebral arch to break and damage the danger of vertebral body the place ahead internal organs.3. method can improve the screw fixed effect to a certain extent, but will be screwed into bone cement in the process from the nail road or the broken cortical bone risk of leaking in the face of screw.The bone cement (PMMA) that leaks exists heat of polymerization damage effect, toxicity, can not absorb and inserts long term shortcomings such as thing becomes flexible.Method 4. fixed effect is better, and the bone cement leakage problem can be effectively avoided in operation under C arm machine.Therefore, 4. method becomes the focus that osteoporosis centrum internal fixation field is clinical and scientific research is studied.
Summary of the invention
The purpose of this utility model provides a kind of simple in structure, flows out characteristics have 3 side openings in the screw rod middle and lower part the universal pedicle screw of vasopressing injection according to bone cement.
Technical scheme that the purpose of this utility model adopts is to comprise that the head of screw of screw is arc surface, the center is the non-through bottom of hollow passageway; The lower end of U-shaped connector is concaved circular cambered surface, there is female thread the middle and upper part, its head of screw embeds in the concaved circular cambered surface of U-shaped connector lower end, there is interior hexagonal heavy stand hole on aforesaid head of screw top, there is the following U-lag hole of perforation lower end, screw rod middle and lower part, and the low spiral shell spacing L of circular hole has middle slotted eye on circular port, the left side ratio on the right side in U-lag hole has.
This utility model, it is in extensive range to have an injection bone cement pore size distribution, and the hold at bone one nail interface is big, and screw is fixed, the characteristics of effectively avoiding bone cement to leak.Reach the effect of remarkable enhancing pedicle screw stability.
Description of drawings
Further specify this utility model below in conjunction with accompanying drawing.
Accompanying drawing is this utility model broken section structural representation.
Among the figure: the interior hexagonal countersunk head platform hole of U-lag hole 6-7-U shape connector 8-female thread L-spiral shell spacing under the slotted eye 5-among the last circular port 4-of 1-head of screw 2-screw rod 3-.
The specific embodiment
As shown in drawings, the head of screw 1 that comprises screw is arc surface, the center is the non-through bottom of hollow passageway; The lower end of U-shaped connector 7 is concaved circular cambered surface, there is female thread 8 middle and upper part, its head of screw 1 embeds in the U-shaped connector 7 lower end concaved circular cambered surfaces, there is interior hexagonal heavy stand hole 6 on aforesaid head of screw 1 top, there is the following U-lag hole 5 of perforation lower end, screw rod middle and lower part, slotted eye 4 during circular hole 3 low spiral shell spacing L have on circular port 3, the left side ratio on the right side in U-lag hole 5 has.
Also can adopt the head of screw 1 of screw and the lower end concaved circular cambered surface of U-shaped connector 7 to form an integral body.
Claims (1)
1. the universal pedicle screw of vasopressing injection comprises that the head of screw (1) of screw is arc surface, the center is the non-through bottom of hollow passageway; The lower end of U-shaped connector (7) is concaved circular cambered surface, there is female thread (8) middle and upper part, it is characterized in that: head of screw (1) embeds in the concaved circular cambered surface of U-shaped connector (7) lower end, there is interior hexagonal heavy stand hole (6) on aforesaid head of screw (1) top, there is the following U-lag hole (5) of perforation lower end, screw rod middle and lower part, has last circular port (3), left side than the low spiral shell spacing L of last circular hole (3) middle slotted eye (4) to be arranged on the right side of U-lag hole (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200522978U CN201958992U (en) | 2011-03-02 | 2011-03-02 | Pressurized injection universal vertebral pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200522978U CN201958992U (en) | 2011-03-02 | 2011-03-02 | Pressurized injection universal vertebral pedicle screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201958992U true CN201958992U (en) | 2011-09-07 |
Family
ID=44521516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200522978U Expired - Lifetime CN201958992U (en) | 2011-03-02 | 2011-03-02 | Pressurized injection universal vertebral pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201958992U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103054642A (en) * | 2012-11-23 | 2013-04-24 | 许家豪 | Detachable resetting compression bone nail |
| CN103110453A (en) * | 2013-03-05 | 2013-05-22 | 吴志宏 | Bone cement screw and preparation method thereof |
-
2011
- 2011-03-02 CN CN2011200522978U patent/CN201958992U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103054642A (en) * | 2012-11-23 | 2013-04-24 | 许家豪 | Detachable resetting compression bone nail |
| CN103054642B (en) * | 2012-11-23 | 2015-03-18 | 许家豪 | Detachable resetting compression bone nail |
| CN103110453A (en) * | 2013-03-05 | 2013-05-22 | 吴志宏 | Bone cement screw and preparation method thereof |
| CN103110453B (en) * | 2013-03-05 | 2015-11-25 | 吴志宏 | A kind of bone cement screw and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110907 |