CN204671262U - A kind of high-strength bone screw base - Google Patents
A kind of high-strength bone screw base Download PDFInfo
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- CN204671262U CN204671262U CN201520286962.8U CN201520286962U CN204671262U CN 204671262 U CN204671262 U CN 204671262U CN 201520286962 U CN201520286962 U CN 201520286962U CN 204671262 U CN204671262 U CN 204671262U
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- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 13
- 230000012447 hatching Effects 0.000 claims abstract description 23
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 239000007943 implant Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 208000032843 Hemorrhage Diseases 0.000 description 1
- 230000002968 anti-fracture Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000002153 concerted effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002324 minimally invasive surgery Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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Abstract
A kind of high-strength bone screw base, relate to operation on vertebra technical field of medical instruments, comprise nail seat main body and fastening plug screw, it is characterized in that tooth height 0.2-0.8 times of fastening screw external screw thread upper side beyond the Great Wall from crest to thread is provided with the outer baffle block raised up, the tooth height of the female thread downside inside nail seat body top from crest to thread 0.8-0.2 times of internal stop matched with outer baffle block be provided with to lower convexity; In the axial section of nail seat main body, the hatching of the female thread upper side inside nail seat body top and the axis of nail seat main body are 30 ° of-75 ° of angles; In the axial section of fastening plug screw, the hatching of fastening screw external screw thread downside beyond the Great Wall and fastening plug screw axis are 30 ° of-75 ° of angles.It is simple that this utility model has structure, and locking effect is good, and nail wall not easily opens, and thread is easy fracture not, safety advantages of higher.
Description
Technical field
The present invention relates to operation on vertebra technical field of medical instruments, say it is that simple, the fastening plug screw of a kind of structure can by pitman secure lock in detail, locking effect is good, and thread is easy fracture not, and high anti-of safety opens anti-fracture high-strength bone screw base.
Background technology
We know, the screw used in the surgical operation of orthopaedic disease at present has uni-axial screws, monoplane screw and Universal screw nail, and above-mentioned bone screw includes screw base and screw, and screw base bottom is connected with screw, and screw base is for installing pitman.The screw base of existing above-mentioned bone screw includes nail seat main body and fastening plug screw, longitudinally pilot hole is provided with in nail seat main body, nail seat body top is provided with the U-lag for wearing pitman, the nail seat main body inner wall of U-lag both sides is provided with female thread, and what fastening plug screw matched with the female thread in nail seat main body inner wall is located in nail seat body top.The screw thread of existing screw base has a lot of type, as rectangular thread, and buttress thread, negative angle buttress thread etc.Screw base ubiquity two shortcomings of these type screw threads, one, when fastening plug screw applies pressure to pitman, the screw base of U-lag both sides outwards opens, when pressure is excessive, female thread and portion with external threads depart from, and thread destroys; Two, when fastening plug screw is excessive to pitman applied pressure, easily there is shear fracture in the female thread in nail seat main body inner wall and the fastening screw externally threaded thread be beyond the Great Wall mated, above-mentioned situation all can cause the screw fail that implants and cannot use, must take out in patient body, have a strong impact on the safety of operation.The buttress thread of negative angle is the most popular tooth form of current pedicle screw, and the stress surface upper angle of thread is generally-4 to-5 degree, and the intensity of this thread itself is higher, and negative angle also can prevent the screw base of U-shaped from opening to a certain extent.But when the torque ratio that plug screw applies is larger, or easily there is above-mentioned two problems.Although autotomy, plug screw can limit the moment of torsion on plug screw, but some operation technique likely needs again to tighten plug screw after plug screw of autotomying is autotomyed, such doctor just likely can apply excessive moment of torsion and cause screw base and plug screw to destroy, problems happens occasionally in clinical, and the screw of destruction will be taken out, then need all screws unclamping homonymy, have a strong impact on the experience of product, and bring huge risk to patient, not only extend operating time, and add risk that is hemorrhage and that infect, even need to transfer open surgery to when there is problems in Minimally Invasive Surgery and the wound strengthened patient.Helical flange technology is the tooth form abroad come into vogue gradually in recent years, and the Polaris5.5 screw system as Biomet company of the U.S. just have employed this technology.This tooth form adds a flange (projection) tilted on the basis of rectangular thread on the stress surface of thread, and when plug screw is tightened downwards, the inclined-plane on flange just can produce inside pulling force, avoids opening of nail wall.Due to the existence of flange, the thickness of the tooth Thickness Ratio ordinary rectangular screw thread of the intermediate location of thread and nail wall reduces, flange is higher, the thickness of root part of screw tooth is thinner, this just produces stress at root part of screw tooth and concentrates and reduce the intensity of thread, when the moment of torsion that plug screw is tightened is enough large, thread will because shear stress is excessive at fracture of root.So although helical flange technology solves the problem that nail wall opens, but owing to weakening the intensity of thread itself, the safety and reliability of screw still can't be greatly improved, and still there is the risk of thread fracture in actual use and is never widely used.
Summary of the invention
The object of the invention is to solve above-mentioned the deficiencies in the prior art, provide a kind of structure simple, locking effect is good, and nail wall not easily opens, and thread is easy fracture not, the high-strength bone screw base that safety is high.
The present invention solves the technical scheme that above-mentioned the deficiencies in the prior art adopt:
A kind of high-strength bone screw base, comprise nail seat main body and fastening plug screw, longitudinally pilot hole is provided with in nail seat main body, nail seat body top is provided with the U-lag for wearing pitman, the nail seat main body inner wall of U-lag both sides is provided with female thread, what fastening plug screw matched with female thread is located in nail seat body top, it is characterized in that tooth height 0.2-0.8 times of fastening screw external screw thread upper side beyond the Great Wall from crest to thread is provided with the outer baffle block raised up, the tooth height of female thread downside inside nail seat body top from crest to thread 0.8-0.2 times of internal stop matched with outer baffle block be provided with to lower convexity, in the axial section of nail seat main body, the hatching of the female thread upper side inside nail seat body top and the axis of nail seat main body are 30 ° of-75 ° of angles, in the axial section of fastening plug screw, the hatching of fastening screw external screw thread downside beyond the Great Wall and fastening plug screw axis are 30 ° of-75 ° of angles.
In the axial section of nail seat main body of the present invention, the hatching of the female thread downside inside described nail seat body top and the axes normal of nail seat main body, in the axial section of fastening plug screw, the hatching of described fastening screw external screw thread upper side beyond the Great Wall and fastening plug screw axes normal.Certainly, these vertical hatchings also can have a certain degree with the axis of nail seat or plug screw, as 75-105 degree.
Fastening screw described in the present invention external screw thread upper side is beyond the Great Wall provided with from crest to high about 0.5 times of the tooth of thread the outer baffle block raised up, and the female thread downside of screw base upper inner is from crest to the high about 0.5 times of internal stop matched with outer baffle block be provided with to lower convexity of the tooth of thread; In the axial section of nail seat main body, the hatching of the female thread upper side inside nail seat body top and the axis of nail seat main body are 45 ° of angles; In the axial section of fastening plug screw, the hatching of fastening screw external screw thread downside beyond the Great Wall and fastening plug screw axis are 45 ° of angles.The height of the outer baffle block described in the present invention and internal stop is 0.03-0.2 times of pitch.
In order to fall the situation of stress concentration, the hatching profile of the thread of the internal and external threads in the present invention should smoothly transit, and avoids each line segment with wedge angle transition, produces stress and concentrates and reduce the intensity of screw thread.The present invention in use, when external screw thread and the female thread of nail seat body top of fastening plug screw engage each other be connected time, in groove between internal stop is embedded at the bottom of the externally threaded outer baffle block of fastening screw plug and tooth, in groove between outer baffle block is embedded at the bottom of the internal stop of the female thread on screw base top and tooth, when fastening plug screw is tightened, the trend that screw base top expands outwardly is stoped by the inside and outside internal stop that cooperatively interacts and outer baffle block, be evenly distributed at the thread upper stress of internal and external threads, root part of screw tooth intensity is high, female thread and external screw thread fit tightly, compress, locking pitman, locking effect is good, firm with the connecting portion of nail seat main body and fastening plug screw at the bottom of female thread and externally threaded tooth, avoid the failure by shear with thread of opening of nail seat simultaneously, the safety of screw is greatly improved.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of fastening plug screw in the present invention.
Fig. 3 is the structural representation of nail seat main body in the present invention.
Fig. 4 is the structural representation after mounting screw of the present invention.
Fig. 5 is the thread force analysis figure of the present invention's fastening plug screw when using.
Detailed description of the invention
High-strength bone screw base as Figure 1-3, comprise nail seat main body 1 and fastening plug screw 2, longitudinally pilot hole is provided with in nail seat main body 1, nail seat main body 1 top is provided with the U-lag for wearing pitman, nail seat main body 1 inwall of U-lag both sides is provided with female thread, what fastening plug screw 2 matched with female thread is located in nail seat body top, the tooth height of external screw thread upper side 3 on fastening plug screw 2 from crest to thread 0.2-0.8 times is provided with the outer baffle block 4 raised up, tooth height 0.8-0.2 times of female thread downside 7 from crest to thread of nail seat main body 1 upper inner is provided with the internal stop 6 matched with outer baffle block to lower convexity, described outer baffle block and the height of internal stop are 0.03-0.2 times of pitch.As can be seen from Figure 3, in the axial section of nail seat main body 1, the hatching of the female thread upper side 8 of nail seat main body 1 upper inner is inclined upwardly from the inside to the outside, be the angle of 30 °-75 ° with the axis of nail seat main body; In the axial section of fastening plug screw, the hatching of fastening screw external screw thread downside 5 beyond the Great Wall from inside to outside acclivitous, be 30 ° of-75 ° of angles with fastening plug screw axis.In the axial section of nail seat main body, the hatching of the female thread downside 7 inside described nail seat body top and the axes normal of nail seat main body or the angle becoming a 75-105 degree, in the axial section of fastening plug screw, hatching and fastening plug screw axes normal or the angle becoming a 75-105 degree of described fastening screw external screw thread upper side 3 beyond the Great Wall.
Fastening screw described in the present invention external screw thread upper side is beyond the Great Wall provided with from crest to high about 0.5 times of the tooth of thread the outer baffle block raised up, and the female thread downside of screw base upper inner is from crest to the high about 0.5 times of internal stop matched with outer baffle block be provided with to lower convexity of the tooth of thread; In the axial section of nail seat main body, the hatching of the female thread upper side inside nail seat body top and the axis of nail seat main body are 45 ° of angles; In the axial section of fastening plug screw, the hatching of fastening screw external screw thread downside beyond the Great Wall and fastening plug screw axis are 45 ° of angles.Female thread and external screw thread are the identical screw thread that cross sectional shape is contrary up and down.
In order to fall the situation of stress concentration, the hatching profile of the thread of the internal and external threads in the present invention should smoothly transit, and avoids each line segment with wedge angle transition, produces stress and concentrates and reduce the intensity of screw thread.The present invention in use, when external screw thread and the female thread of nail seat body top of fastening plug screw engage each other be connected time, in groove between internal stop is embedded at the bottom of the externally threaded outer baffle block of fastening screw plug and tooth, in groove between outer baffle block is embedded at the bottom of the internal stop of the female thread on screw base top and tooth, when fastening plug screw is tightened, the thread of plug screw is as shown in Figure 5 stressed.The surface of the outer baffle block of thread and upper side all receive the counteracting force of the mating surface from screw base, making a concerted effort of these counteracting forces is exactly the coupling mechanism force being pressed in pitman, the side of outer baffle block then receives the counteracting force of the side of the internal stop of screw base, this counteracting force direction is concerning outside plug screw, and be inside pulling force concerning the nail wall of screw base, thus avoid opening of nail wall.And the lower surface of thread is due to the existence of oblique plane with large-angle, the thickness of root part of screw tooth is increased greatly, the phenomenon that stress is concentrated is eliminated, and because stress is less outside thread, even if thickness is less, also be not easy to occur destroying, thus maximally utilised the intensity of material on whole thread, make stress distribution more even, reach opening of both anti-non-magnetic shim walls, prevent again the object of the failure by shear of thread, the safety of screw is greatly improved.Tooth form on the tooth form of screw base and plug screw is that pairing is complementary, and therefore its stress distribution is similar with the thread stress distribution on plug screw.After have employed tooth form of the present invention, the strength problem of screw thread obtains the solution of essence, make the nail seat always perplexing orthopedist open the problem destroyed with thread to be able to solve more thoroughly, the safety of widely used implant in this orthopaedics of pedicle screw is greatly improved.
Claims (4)
1. a high-strength bone screw base, comprise nail seat main body and fastening plug screw, longitudinally pilot hole is provided with in nail seat main body, nail seat body top is provided with the U-lag for wearing pitman, the nail seat main body inner wall of U-lag both sides is provided with female thread, what fastening plug screw matched with female thread is located in nail seat body top, it is characterized in that tooth height 0.2-0.8 times of fastening screw external screw thread upper side beyond the Great Wall from crest to thread is provided with the outer baffle block raised up, the tooth height of female thread downside inside nail seat body top from crest to thread 0.8-0.2 times of internal stop matched with outer baffle block be provided with to lower convexity, in the axial section of nail seat main body, the hatching of the female thread upper side inside nail seat body top and the axis of nail seat main body are 30 ° of-75 ° of angles, in the axial section of fastening plug screw, the hatching of fastening screw external screw thread downside beyond the Great Wall and fastening plug screw axis are 30 ° of-75 ° of angles.
2. high-strength bone screw base according to claim 1, is characterized in that the height of described outer baffle block and internal stop is 0.03-0.4 times of pitch.
3. high-strength bone screw base according to claim 1 and 2, it is characterized in that nail seat main body axial section in, the hatching of the female thread downside inside described nail seat body top and the axes normal of nail seat main body, in the axial section of fastening plug screw, the hatching of described fastening screw external screw thread upper side is beyond the Great Wall with fastening plug screw axes normal or become an angle being 75-105 degree.
4. high-strength bone screw base according to claim 3, it is characterized in that described fastening screw external screw thread upper side is beyond the Great Wall provided with from crest to high 0.5 times of the tooth of thread the outer baffle block raised up, the female thread downside of screw base upper inner is from crest to the high 0.5 times of internal stop matched with outer baffle block be provided with to lower convexity of the tooth of thread; In the axial section of nail seat main body, the hatching of the female thread upper side inside nail seat body top and the axis of nail seat main body are 45 ° of angles; In the axial section of fastening plug screw, the hatching of fastening screw external screw thread downside beyond the Great Wall and fastening plug screw axis are 45 ° of angles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520286962.8U CN204671262U (en) | 2015-05-06 | 2015-05-06 | A kind of high-strength bone screw base |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520286962.8U CN204671262U (en) | 2015-05-06 | 2015-05-06 | A kind of high-strength bone screw base |
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| Publication Number | Publication Date |
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| CN204671262U true CN204671262U (en) | 2015-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520286962.8U Active CN204671262U (en) | 2015-05-06 | 2015-05-06 | A kind of high-strength bone screw base |
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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 |
| CN109276305A (en) * | 2018-09-19 | 2019-01-29 | 丁敬瑄 | A kind of orthopaedics lock screw |
-
2015
- 2015-05-06 CN CN201520286962.8U patent/CN204671262U/en active Active
Cited By (4)
| 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 |
| WO2016177303A1 (en) * | 2015-05-06 | 2016-11-10 | 山东威高骨科材料股份有限公司 | High strength bone screw seat |
| CN109276305A (en) * | 2018-09-19 | 2019-01-29 | 丁敬瑄 | A kind of orthopaedics lock screw |
| CN109276305B (en) * | 2018-09-19 | 2021-11-30 | 陆焕彪 | Orthopedic locking screw |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Hao Dingjun Inventor after: Wu Chunhui Inventor after: Zheng Xiujun Inventor after: Kou Wanfu Inventor after: Wang Han Inventor after: Gao Yajun Inventor before: Hao Dingjun Inventor before: Wu Chunhui Inventor before: Zheng Xiujun Inventor before: Kou Wanfu Inventor before: Wang Han Inventor before: Gao Yajun |