CN204169918U - The pedicle screw assemblies that the two screw thread of a kind of Medical flexible, resistance to plucking go out - Google Patents
The pedicle screw assemblies that the two screw thread of a kind of Medical flexible, resistance to plucking go out Download PDFInfo
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- CN204169918U CN204169918U CN201420580776.0U CN201420580776U CN204169918U CN 204169918 U CN204169918 U CN 204169918U CN 201420580776 U CN201420580776 U CN 201420580776U CN 204169918 U CN204169918 U CN 204169918U
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- screw thread
- supporter
- screw
- plucking
- resistance
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Abstract
The pedicle screw assemblies that this utility model relates to the two screw thread of a kind of Medical flexible, resistance to plucking goes out, axle is controlled by arranging screw thread in the hollow cavity of rivet nut, and screw thread control axle matches with connecting rod, connecting rod connects scalable screw, scalable screw is arranged on the outer wall of rivet nut front end and offers in some holes, and be butterfly structure because screw thread controls the cross section of axle, comprise axis and symmetrically arranged first supporter of axis of spindle and the second supporter in edge on it; The outside of the first supporter and the second supporter is all fixed with two slide plates matched with connecting rod; The cross section of slide plate is crescent, and two slide plates are oppositely arranged; Thus axle can be controlled by rotating screw thread, regulating the rise and fall of scalable screw, controlling by rotating screw thread the back-out that axle realizes screw thread, when improving osteoporosis or overhaul secondary Pin nail, internal fixation of spine stability, reduces the incidence rate loosening even to deviate from.
Description
Technical field
This utility model belongs to field of medical auxiliary equipment, is specifically related to the two screw thread of a kind of Medical flexible, pedicle screw assemblies that resistance to plucking goes out.
Background technology
Spinal fusion is one of primary treatments for the treatment of spinal column many types disease, U.S.'s spinal fusion surgery number of cases cumulative year after year, 1998 to 2008, in every 100,000 populations, cervical vertebra, thoracic vertebra, Lumbar Fusion number of cases increase 90% respectively, 61% and 141% (Rajaee SS, Bae HW, Kanim LE, DelamarterRB.Spinal fusion in the United States:analysis of trends from 1998to 2008.Spine (Phila Pa 1976) 2012; 37 (1): 67-76).Spinal fusion many employings posterior Pedicle screw+hold-down bars-nail-stick system realizes, but along with aged tendency of population and the raising of osteoporosis sickness rate that brings thus, and cause spinal fusion unsuccessfully to need (the Rajaee SS that increases of revision procedure because pedicle screw loosens, Kanim LEA, Bae HW.National trends in revision spinal fusion in the USA:Patientcharacteristics and complications.Bone Joint J 2014; , traditional pedicle screw technique for fixing is subject to great challenge 96B (6): 807-16).For the vertebral body of osteoporosis with secondary Pin nail when overhauling, traditional pedicle screw is fixedly easy to loosening, and is difficult to realize firm fixing; Recent domestic scholar has carried out all explorations and improvement, comprise nail sheath, expansion screw screw assembly, injectable screw assembly etc., although osteoporosis also can be realized and overhaul the fixing of vertebral body pedicle nail, expand or after injection screw assembly change into irreversibility.Once pedicle screw goes wrong, need take out internal fixtion, these improvement cannot realize smooth taking-up.
Biomechanics Research shows, the hold of pedicle screw and bone interface, is directly proportional with the area contacted and the degree of depth.Dark screw thread can increase the contact area with sclerotin, improves hold and the resisting pull out forces of screw.The depth of thread of pedicle screw conventional is at present 1mm.
Utility model content
The purpose of this utility model is to overcome the shortcoming existed in above-mentioned prior art, provides the two screw thread of a kind of Medical flexible, pedicle screw assemblies that resistance to plucking goes out, has fixation, can improve the hold of screw and the advantage of resisting pull out forces.
For achieving the above object, this utility model by the following technical solutions: the rivet nut comprising hollow, the afterbody of rivet nut is fixed with nail tail; Be provided with the screw thread that can rotate in the hollow cavity of rivet nut and control axle, and one end that screw thread control axle offers swivelling chute is run through outside nail tail;
The outer wall of described rivet nut is fixed with some retaining threads, rivet nut front end outer wall offers some holes, be provided with some scalable screws in hole, the bottom of scalable screw is fixed with connecting rod, and one end of connecting rod is arranged at screw thread and controls in axle;
The cross section that described screw thread controls axle be butterfly structure, comprises axis and symmetrically arranged first supporter of axis of spindle and the second supporter in edge on it; The inner side of the first supporter and the second supporter is all fixed on axis, and the outside of the first supporter and the second supporter is all fixed with two slide plates matched with connecting rod;
The cross section of described slide plate is crescent, and two slide plates are oppositely arranged.
Described nail tail is bowl-shape, and its inwall is provided with female thread.
Two hypotenuse length of the first described supporter and the second supporter are equal, and the angle at base angle is 45 °.
The material that described screw thread controls axle, connecting rod and nail tail is medical titanium alloy.
The diameter of described screw thread control axle is less than the diameter of hollow cavity.
The height of described retaining thread is 0.8 ~ 1.2mm.
Described scalable screw length is 1.5 ~ 2.5mm.
The external diameter of described hollow rivet nut is 6 ~ 7mm.
The internal diameter of described hollow cavity is 2.5 ~ 3.5mm.
The bottom of described connecting rod, is fixed with the second slide plate matched with the first slide plate.
This utility model has following beneficial effect: prior art of comparing, this utility model controls axle by arranging screw thread in the hollow cavity of rivet nut, and screw thread control axle matches with connecting rod, connecting rod connects scalable screw, scalable screw is arranged on the outer wall of rivet nut front end and offers in some holes, and be butterfly structure because screw thread controls the cross section of axle, comprise axis and symmetrically arranged first supporter of axis of spindle and the second supporter in edge on it; The outside of the first supporter and the second supporter is all fixed with two slide plates matched with connecting rod; The cross section of slide plate is crescent, and two slide plates are oppositely arranged; Thus axle can be controlled by rotating screw thread, regulate the rise and fall of scalable screw, greatly facilitate use.Control by rotating screw thread the back-out that axle realizes screw thread, when improving osteoporosis or overhaul secondary Pin nail, internal fixation of spine stability, reduces the incidence rate loosening even to deviate from.When special circumstances need take out internal fixtion, by rotating screw thread control axle, scalable screw being regained, realizing the perfect adaptation that resistance to plucking goes out and can take out.Reduce the risk that pedicle screw loosens, extracts, meanwhile, scalable screw designs, also ensure that in particular cases pedicle screw can take out, and effectively improves clinical efficacy.
Further, because nail tail is bowl-shape, inwall is provided with female thread, thus reduces user to the operation easier of rivet nut, doctor is used convenient.
Accompanying drawing explanation
Fig. 1 is this utility model overall structure schematic diagram.
Fig. 2 be this utility model when being in retraction initial condition screw thread control axle construction schematic diagram.
Fig. 3 is that this utility model is in screw thread control axle construction schematic diagram when stretching out state.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described in further detail.
See Fig. 1-3, this utility model comprises the rivet nut 1 of hollow, and the afterbody of rivet nut 1 is fixed with nail tail 5; Be provided with the screw thread that can rotate in the hollow cavity 6 of rivet nut 1 and control axle 3, and one end that screw thread control axle 3 offers swivelling chute is run through outside nail tail 5; The outer wall of rivet nut 1 is fixed with some retaining threads 7, rivet nut 1 front end outer wall offers some holes, is provided with some scalable screws 8 in hole, the bottom of scalable screw 8 is fixed with connecting rod 4, and one end of connecting rod 4 is arranged at screw thread and controls in axle 3; It is butterfly structure that screw thread controls the cross section of axle 3, comprise axis 2 with its on along symmetrically arranged first supporter 9 and the second supporter 10 of axis 2 center line; The inner side of the first supporter 9 and the second supporter 10 is all fixed on axis 2, and the outside of the first supporter 9 and the second supporter 10 is all fixed with two slide plates 12 matched with connecting rod 4; The cross section of slide plate 12 is crescent, and two slide plates 12 are oppositely arranged.The cross section of nail tail 5 is U-shaped, and its inwall is provided with female thread 11.Two hypotenuse length of the first supporter 9 and the second supporter 10 are equal, and the angle at base angle is 45 °, and the material that screw thread controls axle 3, connecting rod 4 and nail tail 5 is medical titanium alloy.The diameter of screw thread control axle 3 is less than the diameter of hollow cavity 6.The height of retaining thread 7 is 0.8 ~ 1.2mm.Scalable screw 8 length is 1.5 ~ 2.5mm.The external diameter of hollow rivet nut 1 is 6 ~ 7mm.The internal diameter of hollow cavity 6 is 2.5 ~ 3.5mm.The bottom of described connecting rod 4, is fixed with the second slide plate 13 matched with the first slide plate 12.
Using method: when spinal surgery, after pedicle of vertebral arch place accurately sets up pedicle screw duct, this pedicle screw assemblies can be used, guarantee that two thread depth is consistent, and when scalable screw 8 is in home position, after conventional implantation pedicle nail, employing turns core propeller, control the axis 2 in axle 3 by the screw thread of rotary tack tail opening, stretching out of scalable screw 8 in pedicle screw can be realized, realize the bone hold improving screw.If need pedicle screw be taken out, then by rotating the axis 2 in screw thread control axle 3, realizing the retraction of scalable screw 8 in screw, realizing taking out smoothly.
In use:
Stretch out state: by rotating the axis 2 in screw thread control axle 3, and owing to being fixed on axis 2 in the inner side of the first supporter 9 and the second supporter 10, axis 2 drives the first supporter 9 and the second supporter 10 together to rotate when rotating, two sidewall extrusion of the first supporter 9 and the second supporter 10 are connected with the connecting rod 4 of scalable screw 8, make scalable screw 8 increase, stretch out screw thread and control outside axle 3; The one end being fixed with the second slide plate 13 of rotating 90 ° of rear connecting rods 4 is fastened in the first slide plate 12 of two composition butterfly structures, and butterfly structure positions scalable screw 8, avoids it to slide, and makes it fixing firm; Dark screw thread can increase the contact area with sclerotin, improves hold and the resisting pull out forces of screw.
Indentation state: rotation central axis 2, the anglec of rotation is 90 °, because bone has pressure to scalable screw 8, scalable screw 8 is after the support losing the first supporter 9 and the second supporter 10, the pressure of the scalable screw 8 of bone makes its retraction screw thread control in axle 3, thus greatly reduce hold, and at this moment, can easily from detaching device in bone.
Claims (10)
1. the pedicle screw assemblies that goes out of the two screw thread of Medical flexible, resistance to plucking, it is characterized in that: the rivet nut (1) comprising hollow, the afterbody of rivet nut (1) is fixed with nail tail (5); Be provided with the screw thread that can rotate in the hollow cavity (6) of rivet nut (1) and control axle (3), and nail tail (5) is run through outward in one end that screw thread control axle (3) offers swivelling chute;
The outer wall of described rivet nut (1) is fixed with some retaining threads (7), rivet nut (1) front end outer wall offers some holes, some scalable screws (8) are provided with in hole, the bottom of scalable screw (8) is fixed with connecting rod (4), and one end of connecting rod (4) is arranged at screw thread and controls in axle (3);
The cross section that described screw thread controls axle (3) is butterfly structure, comprise axis (2) and its on along symmetrically arranged first supporter (9) of axis (2) center line and the second supporter (10); The inner side of the first supporter (9) and the second supporter (10) is all fixed on axis (2), and the outside of the first supporter (9) and the second supporter (10) is all fixed with two the first slide plates (12) matched with connecting rod (4);
The cross section of described slide plate (12) is crescent, and two the first slide plates (12) are oppositely arranged.
2. the pedicle screw assemblies that goes out of the two screw thread of a kind of Medical flexible according to claim 1, resistance to plucking, is characterized in that: described nail tail (5) in bowl-shape, and its inwall is provided with female thread (11).
3. the pedicle screw assemblies that goes out of the two screw thread of a kind of Medical flexible according to claim 1, resistance to plucking, it is characterized in that: described the first supporter (9) is equal with two hypotenuse length of the second supporter (10), and the angle at base angle is 45 °.
4. the pedicle screw assemblies that goes out of the two screw thread of a kind of Medical flexible according to claim 1, resistance to plucking, is characterized in that: the material that described screw thread controls axle (3), connecting rod (4) and follows closely tail (5) is medical titanium alloy.
5. the pedicle screw assemblies that goes out of the two screw thread of a kind of Medical flexible according to claim 1, resistance to plucking, is characterized in that: the diameter that described screw thread controls axle (3) is less than the diameter of hollow cavity (6).
6. the pedicle screw assemblies that goes out of the two screw thread of a kind of Medical flexible according to claim 1, resistance to plucking, is characterized in that: the height of described retaining thread (7) is 0.8 ~ 1.2mm.
7. the pedicle screw assemblies that goes out of the two screw thread of a kind of Medical flexible according to claim 1, resistance to plucking, is characterized in that: described scalable screw (8) length is 1.5 ~ 2.5mm.
8. the pedicle screw assemblies that goes out of the two screw thread of a kind of Medical flexible according to claim 1, resistance to plucking, is characterized in that: the external diameter of described hollow rivet nut (1) is 6 ~ 7mm.
9. the pedicle screw assemblies that goes out of the two screw thread of a kind of Medical flexible according to claim 1, resistance to plucking, is characterized in that: the internal diameter of described hollow cavity (6) is 2.5 ~ 3.5mm.
10. the pedicle screw assemblies that goes out of the two screw thread of a kind of Medical flexible according to claim 1, resistance to plucking, it is characterized in that: the bottom of described connecting rod (4), be fixed with the second slide plate (13) matched with the first slide plate (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420580776.0U CN204169918U (en) | 2014-10-09 | 2014-10-09 | The pedicle screw assemblies that the two screw thread of a kind of Medical flexible, resistance to plucking go out |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420580776.0U CN204169918U (en) | 2014-10-09 | 2014-10-09 | The pedicle screw assemblies that the two screw thread of a kind of Medical flexible, resistance to plucking go out |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204169918U true CN204169918U (en) | 2015-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420580776.0U Withdrawn - After Issue CN204169918U (en) | 2014-10-09 | 2014-10-09 | The pedicle screw assemblies that the two screw thread of a kind of Medical flexible, resistance to plucking go out |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204169918U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104287819A (en) * | 2014-10-09 | 2015-01-21 | 中国人民解放军第四军医大学 | Medical pedicle screw component with telescopic double thread and capable of resisting pullout |
| CN106691570A (en) * | 2017-01-22 | 2017-05-24 | 北京爱康宜诚医疗器材有限公司 | Bolt |
-
2014
- 2014-10-09 CN CN201420580776.0U patent/CN204169918U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104287819A (en) * | 2014-10-09 | 2015-01-21 | 中国人民解放军第四军医大学 | Medical pedicle screw component with telescopic double thread and capable of resisting pullout |
| WO2016054951A1 (en) * | 2014-10-09 | 2016-04-14 | 中国人民解放军第四军医大学 | Telescopic double-threaded pull-out resistant pedicle screw assembly for medical use |
| CN106691570A (en) * | 2017-01-22 | 2017-05-24 | 北京爱康宜诚医疗器材有限公司 | Bolt |
| CN106691570B (en) * | 2017-01-22 | 2020-11-06 | 北京爱康宜诚医疗器材有限公司 | Screw nail |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150225 Effective date of abandoning: 20160629 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |