CN202723971U - Pedicle screw for spondylolisthesis restitution - Google Patents
Pedicle screw for spondylolisthesis restitution Download PDFInfo
- Publication number
- CN202723971U CN202723971U CN 201220344961 CN201220344961U CN202723971U CN 202723971 U CN202723971 U CN 202723971U CN 201220344961 CN201220344961 CN 201220344961 CN 201220344961 U CN201220344961 U CN 201220344961U CN 202723971 U CN202723971 U CN 202723971U
- Authority
- CN
- China
- Prior art keywords
- screw thread
- pedicle screw
- nail
- threaded rod
- pedicle
- Prior art date
- 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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- Surgical Instruments (AREA)
Abstract
The utility model relates to a pedicle screw for spondylolisthesis restitution and belongs to the technical field of a medical instrument. A thread of a threaded rod of the pedicle screw comprises an upper thread and a lower thread, wherein the spiral directions of the upper thread and the lower thread are reverse to each other, and a screw base is concave-shaped. After the pedicle screw is implanted into spinal column, no axial force is generated and the problems of loosening and even sliding caused by the axial force generated by the pedicle screw are effectively solved.
Description
Technical field
This utility model belongs to technical field of medical instruments, is specifically related to the pedicle nail that a kind of spondylolishesis reduction is used.
Background technology
The fixture that is used for the spondylolishesis reduction comprises pitman and pedicle nail, during use, first pitman is curved certain angle in advance, then with pedicle nail implant into body spinal column, in the whole process, unique parts that contact with the human spine are pedicle nails, so pedicle nail is most important parts in the fixture.Pedicle nail comprises nail seat and threaded rod, the screw thread of pedicle nail threaded rod all is one direction rotation screw thread at present, after such pedicle nail is implanted spinal column, the threaded rod of single-rotating direction produces axial force easily, it is loosening to cause pedicle nail to occur, pedicle nail looses from the human spine easily when serious, has a strong impact on spondylolishesis reduction effect.
Summary of the invention
The purpose of this utility model provides the pedicle nail that a kind of spondylolishesis reduction is used, and solves prior art and produces easily axial force, causes the problem that pedicle nail is loosening even get loose.
This utility model mainly is comprised of nail seat and threaded rod, and the screw thread that solves technical scheme that its technical problem adopts and be threaded rod comprises screw thread and lower screw thread, and the hand of spiral of upper screw thread and lower screw thread is opposite, and nail seat is " recessed " font.
The beneficial effects of the utility model are up and down two screw threads that the hand of spiral is opposite of pedicle nail threaded rod setting, behind pedicle nail implant into body spinal column, axially making a concerted effort that screw thread produces up and down is zero, pedicle nail can not produce axial force like this, has effectively solved pedicle nail and has produced the problem that axial force causes loosening even slippage.
Description of drawings
Below in conjunction with the drawings and specific embodiments this utility model is further specified.
Fig. 1 is structural representation of the present utility model.
Screw thread, 4 times screw threads on 1 nail seat, 2 threaded rods, 3 among the figure.
The specific embodiment
As shown in the figure, the pedicle nail that a kind of spondylolishesis reduction is used mainly is comprised of nail seat 1 and threaded rod 2, and the screw thread of threaded rod 2 comprises screw thread 3 and lower screw thread 4, and the hand of spiral of upper screw thread 3 and lower screw thread 4 is opposite, and nail seat 1 is " recessed " font nail seat.
Claims (1)
1. the pedicle nail that the spondylolishesis reduction is used mainly is comprised of nail seat and threaded rod, it is characterized in that the screw thread of threaded rod comprises screw thread and lower screw thread, and the hand of spiral of upper screw thread and lower screw thread is opposite, and nail seat is " recessed " font.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220344961 CN202723971U (en) | 2012-07-16 | 2012-07-16 | Pedicle screw for spondylolisthesis restitution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220344961 CN202723971U (en) | 2012-07-16 | 2012-07-16 | Pedicle screw for spondylolisthesis restitution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202723971U true CN202723971U (en) | 2013-02-13 |
Family
ID=47649731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220344961 Expired - Fee Related CN202723971U (en) | 2012-07-16 | 2012-07-16 | Pedicle screw for spondylolisthesis restitution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202723971U (en) |
-
2012
- 2012-07-16 CN CN 201220344961 patent/CN202723971U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20130716 |