CN204351918U - Medical resistance to plucking pedicle screw - Google Patents
Medical resistance to plucking pedicle screw Download PDFInfo
- Publication number
- CN204351918U CN204351918U CN201420800020.2U CN201420800020U CN204351918U CN 204351918 U CN204351918 U CN 204351918U CN 201420800020 U CN201420800020 U CN 201420800020U CN 204351918 U CN204351918 U CN 204351918U
- Authority
- CN
- China
- Prior art keywords
- screw
- pedicle screw
- interior angle
- utility
- 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
Links
- 238000013461 design Methods 0.000 abstract description 13
- 210000000988 bone and bone Anatomy 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 7
- 238000012958 reprocessing Methods 0.000 abstract 1
- 239000002639 bone cement Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000001054 cortical effect Effects 0.000 description 2
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 2
- 238000001356 surgical procedure Methods 0.000 description 2
- 244000248349 Citrus limon Species 0.000 description 1
- 235000005979 Citrus limon Nutrition 0.000 description 1
- 208000001132 Osteoporosis Diseases 0.000 description 1
- 206010058907 Spinal deformity Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000037182 bone density Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 108010048734 sclerotin Proteins 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Surgical Instruments (AREA)
Abstract
This utility model relates to medical apparatus technical field, specifically disclose medical resistance to plucking pedicle screw, comprise one with externally threaded pedicle screw, described pedicle screw is provided with a tapering, the male threaded end of described pedicle screw is provided with one away from the interior angle in direction, tapering, described interior angle and external screw thread one-body molded.This utility model advantage is, increases by an interior angle, can be increased the bone amount of incision by interior angle at the externally threaded tip of pedicle screw, and interior angle design simultaneously adds moment, further increases the withdrawal resistance of screw.Owing to not adopting swell fixture technology, revision procedure is operated and more easily takes out screw, the design of pedicle screw duct can not be expanded, still can keep good withdrawal resistance reprocessing when nail is put in operation again.
Description
Technical field
This utility model relates to medical apparatus technical field, refers to a kind of medical resistance to plucking pedicle screw especially.
Background technology
Pedicle screw at present extensively should in spinal surgery, treatment fracture, degeneration and deformity of spine etc.But along with applying widely clinically, there is the complication such as pedicle screw loosens, extract, thus having caused Unstable internal fixation.Affecting sclerotin character, pedicle of vertebral arch shape, the screw orientation because have bone density, screw thread incision of pedicle screw constant intensity, putting nail accuracy, screw thread design, screw processing technology and material property etc.The artificial factor that can control, except putting nail accuracy, is exactly the design of screw, comprises screw length, diameter, screw form etc.
Spinal surgery has had the development of advancing by leaps and bounds in last century, more and more come into one's own to the reconstruction of spinal stability.The first set Pedicle screw pating system of the design such as ROY-Camille adopts common cancellous bone screw, after this pedicle of vertebral arch fixed system is only improved nail tail etc., still rests on the pitch of screw thread, working depth and tooth and the number of turns etc. at present to the design of screw thread.To the estimation equation of screw withdrawal resistance be now: F=π dhZfs+fv(d is the diameter of thread, h is screw thread working depth, and Z is the meshing number of turns, and fs is pitch), think that main factor is the diameter of screw and the degree of depth of screw thread at present, the meshing number of turns and pitch also play remarkable effect.Be proportionate with the amount of cortical bone, most of pull-out forces conducts to the several screw threads near screw head by cortical bone simultaneously.Screw thread design also determines the bone amount of screw thread incision.When pitch is certain, the shape of pitch and screw thread determine bone amount number, the bone amount of incision can be changed by the depth of thread changing screw.Design screw overall diameter is constant, and interior diameter is taper, makes screw have larger screw-in moment and resisting pull out forces.Cylindricality screw and cone screw screw in and carry out mechanical test with during backspin 180 ° by Lill etc. completely, and find that the axial pull-out strength of the latter is than the former low 2.5kN, after cyclic loading, displacement is greater than 2.2mm.This illustrates that cone screw should enter by lemon completely, once loosen, pull-out strength is geometrical progression decay.The expansible screw according to swell fixture principle design, coordinates perfusion bone cement obviously can to improve the stability of screw in sufferers of osteoporosis face.But expansible screw and can bone cement screw be poured into, as there is secondary revision procedure, for the removal of original screw adds difficulty.Also increasing hydroxyapatite coating layer increase screw stability by giving screw surface at present, adding the taking-up difficulty of original screw when overhauling equally.
Utility model content
The purpose of this utility model is to provide a kind of medical resistance to plucking pedicle screw, to improve the withdrawal resistance of screw.Because of without expansion, there is no hydroxyapatite coating layer, then when taking out original screw, do not expand nail road, having reserved space for overhauling.
To achieve these goals, this utility model have employed following technical scheme: medical resistance to plucking pedicle screw, comprise one with externally threaded pedicle screw, described pedicle screw is provided with a tapering, the male threaded end of described pedicle screw is provided with one away from the interior angle in direction, tapering, described interior angle and external screw thread one-body molded.
The beneficial effects of the utility model are: after adopting said structure, increase by an interior angle, can be increased the bone amount of incision by interior angle at the externally threaded tip of pedicle screw, and interior angle design simultaneously adds moment, further increases the withdrawal resistance of screw.Owing to not adopting swell fixture technology, revision procedure is operated and more easily takes out screw, the design of pedicle screw duct can not be expanded, still can keep good withdrawal resistance when revision procedure puts nail again.
Accompanying drawing explanation
In order to be illustrated more clearly in this utility model embodiment technical scheme, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only that this utility model is in order to be illustrated more clearly in this utility model embodiment or technical scheme of the prior art, below the accompanying drawing used required in p-embodiment or description of the prior art is briefly described, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is structural representation of the present utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, be clearly and completely described the technical scheme in this utility model embodiment, obviously, described embodiment is only this utility model part embodiment, instead of whole embodiments.Based on the embodiment in this utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of this utility model protection.
The medical resistance to plucking pedicle screw 1 of one as shown in Figure 1, comprise one with the pedicle screw 1 of external screw thread 3, described pedicle screw 1 is provided with a tapering 2, external screw thread 3 end of described pedicle screw 1 is provided with one away from the interior angle 4 in direction, tapering 2, and described interior angle 4 is one-body molded with external screw thread 3.Increase by an interior angle at the tip of the external screw thread 3 of pedicle screw 1, can be increased the bone amount of incision by interior angle, interior angle design simultaneously adds moment, further increases the withdrawal resistance of screw.Owing to not adopting swell fixture technology, revision procedure is operated and more easily takes out screw, the design in the original nail road of pedicle screw can not be expanded, after revision procedure puts nail again, still can keep good withdrawal resistance.
This utility model remains material, the size of pedicle screw 1, only increases by an interior angle at the tip of pedicle screw 1 external screw thread 3.The size of interior angle and angle make corresponding adjustment according to the size of different screw diameter.So that ensure can not additional injuries pedicle of vertebral arch in top set process.
The foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (1)
1. medical resistance to plucking pedicle screw, comprise one with the pedicle screw (1) of external screw thread (3), it is characterized in that, described pedicle screw (1) is provided with a tapering (2), external screw thread (3) end of described pedicle screw (1) is provided with one away from the interior angle (4) in tapering (2) direction, and described interior angle (4) is one-body molded with external screw thread (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420800020.2U CN204351918U (en) | 2014-12-17 | 2014-12-17 | Medical resistance to plucking pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420800020.2U CN204351918U (en) | 2014-12-17 | 2014-12-17 | Medical resistance to plucking pedicle screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204351918U true CN204351918U (en) | 2015-05-27 |
Family
ID=53253417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420800020.2U Expired - Fee Related CN204351918U (en) | 2014-12-17 | 2014-12-17 | Medical resistance to plucking pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204351918U (en) |
-
2014
- 2014-12-17 CN CN201420800020.2U patent/CN204351918U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150527 Termination date: 20161217 |