CN204233203U - A kind of saw-tooth thread locking anti-receding device with negative angle - Google Patents
A kind of saw-tooth thread locking anti-receding device with negative angle Download PDFInfo
- Publication number
- CN204233203U CN204233203U CN201420672695.3U CN201420672695U CN204233203U CN 204233203 U CN204233203 U CN 204233203U CN 201420672695 U CN201420672695 U CN 201420672695U CN 204233203 U CN204233203 U CN 204233203U
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- negative angle
- locking
- screw
- saw
- pedicle screw
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Abstract
This utility model relates to a kind of saw-tooth thread locking anti-receding device with negative angle, this device comprises pedicle screw, pitman and locking plug screw, described pedicle screw and locking plug screw coupling part are the saw-tooth thread of band negative angle, due to the existence of negative angle, when locking pitman, can inside component be produced, screw afterbody being produced and encircles power, reach good locking and anti-loosing effect, can effectively prevent pedicle screw afterbody spreading simultaneously and cause locking to be lost efficacy.
Description
Technical field
This utility model relates to a kind of saw-tooth thread locking anti-receding device with negative angle, belongs to technical field of medical instruments.
Background technology
Nowadays internal fixation of spine technology uses comparative maturity, and Via Posterior Spinal Approach pedicle nail bar system is the main universal means of current spinal surgery circle treatment spinal column various diseases.Domestic and international Via Posterior Spinal Approach nail-stick system is made up of pedicle screw, Orthopedic rod and locking plug screw mostly.Generally, connection between plug screw and pedicle screw adopts common standard screw thread or common saw-tooth thread, common standard screw thread is adopted easily to make screw afterbody spreading, locking plug screw is made to lack enough pretightning forces and anti-loosing effect, adopt common saw-tooth thread, can alleviate screw afterbody spreading, but plug screw still has loosening probability, cause locking to be lost efficacy.
Summary of the invention
In order to overcome weary enough pretightning forces in short supply of spiral plug lock in prior art and locking, cause locking to be lost efficacy, this utility model provides a kind of saw-tooth thread locking anti-receding device with negative angle, to overcome above-mentioned shortcoming and defect.
This utility model is achieved through the following technical solutions:
A saw-tooth thread locking anti-receding device with negative angle, comprises pedicle screw, pitman and locking plug screw; Described pedicle screw afterbody is provided with U-type groove, and U-type groove top is provided with the zigzag female thread of band negative angle; Described pitman is positioned at U-type groove; Described locking plug screw is the zigzag external screw thread of band negative angle, and cooperatively interacts with the zigzag female thread of pedicle screw afterbody.
When being locked by pitman by said structure, the zigzag internal and external threads of band negative angle will produce inside component, produces and encircles power, effectively can prevent screw afterbody spreading to the afterbody of pedicle screw.
Effective benefit of the present utility model is: for the locking between pedicle screw and pitman provides larger coupling mechanism force, and play good anti-loosing effect, simultaneously due to the existence of negative angle, can effectively prevent pedicle screw afterbody spreading and cause locking to be lost efficacy.
Accompanying drawing explanation
With reference to the accompanying drawings this utility model is described in further detail below.
Fig. 1 is overall structure schematic diagram of the present utility model.
Fig. 2 is the saw-tooth thread schematic diagram of this utility model band negative angle α.
Screw afterbody female thread force analysis schematic diagram (monodentate) when Fig. 3 is this utility model locking.
Specific embodiments
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in the figure, a kind of saw-tooth thread locking anti-receding device with negative angle, comprises pedicle screw (1), pitman (2) and locking plug screw (3).
Pedicle screw (1) afterbody is provided with U-type groove, and U-type groove top is provided with the zigzag female thread of band negative angle; Locking plug screw (3) is the zigzag external screw thread of band negative angle, and cooperatively interacts with the zigzag female thread of pedicle screw afterbody; Pitman (2) is positioned at the U-type groove of pedicle screw (1).
When locking plug screw (3) and being locked in the U-type groove of pedicle nail (1) by pitman (2), the zigzag female thread of band negative angle can produce the power F of oblique inner side to pedicle screw afterbody
n, circumferential component Fx and axial thrust load Fy can be obtained by decomposing this power, due to the existence of circumferential component Fx, one can be produced to pedicle screw (1) afterbody and inside encircling power, can effectively prevent screw afterbody spreading and cause locking to be lost efficacy.
This utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but any change is done in its shape or structure; every have identical with the application or akin technical scheme, all drops within protection domain of the present utility model.
Claims (1)
1. the saw-tooth thread locking anti-receding device with negative angle, comprise pedicle screw, pitman and locking plug screw, it is characterized in that described pedicle screw afterbody is provided with U-type groove, U-type groove top is provided with the zigzag female thread of band negative angle; Described pitman is positioned at U-type groove; Described locking plug screw is the zigzag external screw thread of band negative angle, and cooperatively interacts with the zigzag female thread of pedicle screw afterbody.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420672695.3U CN204233203U (en) | 2014-11-13 | 2014-11-13 | A kind of saw-tooth thread locking anti-receding device with negative angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420672695.3U CN204233203U (en) | 2014-11-13 | 2014-11-13 | A kind of saw-tooth thread locking anti-receding device with negative angle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204233203U true CN204233203U (en) | 2015-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420672695.3U Active CN204233203U (en) | 2014-11-13 | 2014-11-13 | A kind of saw-tooth thread locking anti-receding device with negative angle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204233203U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104783887A (en) * | 2015-05-06 | 2015-07-22 | 山东威高骨科材料股份有限公司 | High-strength bone screw base |
| CN114366202A (en) * | 2021-12-31 | 2022-04-19 | 上海利格泰生物科技有限公司 | Use method of interface screw |
-
2014
- 2014-11-13 CN CN201420672695.3U patent/CN204233203U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104783887A (en) * | 2015-05-06 | 2015-07-22 | 山东威高骨科材料股份有限公司 | High-strength bone screw base |
| CN114366202A (en) * | 2021-12-31 | 2022-04-19 | 上海利格泰生物科技有限公司 | Use method of interface screw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 314003, No. 1-2, building 8, Shanghai Jiaotong University (Jiaxing) Science Park, No. 321, Chong Chong Road, Xiuzhou District, Zhejiang, Jiaxing Patentee after: Zhejiang Dekang medical instrument limited company Address before: 314000, building 212, R & D building, Shanghai Jiaotong University (Jiaxing) Science Park, No. 321, Chong Chong Road, Xiuzhou District, Zhejiang, Jiaxing Patentee before: JIAXING DEKANG MEDICAL INSTRUMENT CO., LTD. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A serrated thread locking and anti retreat device with negative angle Effective date of registration: 20210904 Granted publication date: 20150401 Pledgee: China CITIC Bank Co.,Ltd. Jiaxing Branch Pledgor: ZHEJIANG DECANS MEDICAL INSTRUMENT Co.,Ltd. Registration number: Y2021330001348 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |