CN203564323U - Improved vertebral pedicle extending device - Google Patents
Improved vertebral pedicle extending device Download PDFInfo
- Publication number
- CN203564323U CN203564323U CN201320764621.8U CN201320764621U CN203564323U CN 203564323 U CN203564323 U CN 203564323U CN 201320764621 U CN201320764621 U CN 201320764621U CN 203564323 U CN203564323 U CN 203564323U
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- CN
- China
- Prior art keywords
- rivet nut
- pedicle
- nail body
- core bar
- vertebral arch
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- 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 - Lifetime
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- 238000010079 rubber tapping Methods 0.000 claims abstract description 17
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 206010025005 lumbar spinal stenosis Diseases 0.000 description 4
- 208000005198 spinal stenosis Diseases 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 208000024891 symptom Diseases 0.000 description 3
- 208000008035 Back Pain Diseases 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 210000005036 nerve Anatomy 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000002980 postoperative effect Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 206010005963 Bone formation increased Diseases 0.000 description 1
- 206010029174 Nerve compression Diseases 0.000 description 1
- 208000002193 Pain Diseases 0.000 description 1
- 241000135309 Processus Species 0.000 description 1
- 208000037114 Symptom Flare Up Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000002639 bone cement Substances 0.000 description 1
- 210000003164 cauda equina Anatomy 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 210000004262 dental pulp cavity Anatomy 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000002324 minimally invasive surgery Methods 0.000 description 1
- 230000001537 neural effect Effects 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 108010048734 sclerotin Proteins 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
Images
Abstract
The utility model relates to an improved vertebral pedicle extending device consisting of a core rod as well as a front nail body and a rear nail body which are respectively in threaded connection with two ends of the core rod, wherein the external surfaces of the front nail body and the rear nail body are provided with self-tapping threads with equal thread pitch. The improved vertebral pedicle extending device is characterized in that an insertion structure is arranged between the front nail body and the rear nail body; when the front nail body and the rear nail body are inserted together, a pedicle screw is formed; the pedicle screw is provided with a thread hole along the axis; internal threads in the thread hole are same in screwing direction, and the thread pitch of internal threads in the rear nail body is greater than that of internal threads in the front nail body; two ends of the core rod are respectively provided with external threads matched with the internal threads arranged in the front nail body and the rear nail body, and the middle of the core rod is provided with a polished rod, and the length of the core rod is equal to sum of the length of the pedicle screw formed by inserting the front nail body and the rear nail body together and the preset vertebral pedicle extending length. The improved vertebral pedicle extending device not only can be used for avoiding the risk that a vertebral body is pushed to move in a direction away from the vertebral pedicle, and has the advantage of stability.
Description
Technical field
This utility model relates to a kind of medical science surgical instruments, is specifically related to a kind of internal fixation of spine device, and this device is applicable to row pedicle of vertebral arch from disconnected lengthening.
Background technology
Lumbar spinal stenosis refers to by a variety of causes and causes the narrow of canalis spinalis or nerve root canal or intervertebral foramina as intervertebral disc projection, hyperosteogeny or proliferation of fibrous tissue, plumpness, stimulation and pressuring neural root or cauda equina nerve and a series of clinical symptoms of causing.The typical clinical manifestation of lumbar spinal stenosis is: lumbar and back pain, and nerve is walked lamely, and the intermittent radiated pain of lower limb is stood, symptom increases the weight of when activity or waist hyperextension for a long time, sits, alleviates during sleeping or waist flexing.Patients with lumbar spinal stenosis expectant treatment is many can not improve symptom, adopts operation method to solve more.
The operation method adopting at present mostly clinically is fixing and interbody fusion in excision decompression, the pedicle screws such as the part or all of vertebral plate of the way of escape, articular process, thereby expands canalis spinalis and intervertebral foramina, reaches the object of removing nerve compression.In practical application, adopting during pedicle screw internal fixation device, the complication such as in often existing, fix unsuccessfully, Adjacent segment degeneration increases the weight of, this type of operation technique complexity of while, wound is large, expense is expensive, post-operative recovery slowly, operability is higher again.
Minimally Invasive Surgery is the inexorable trend of operation development, and the minimally-invasive treatment of lumbar spinal stenosis has that percutaneous nail-stick system is inserted, processus spinosus prop-open art, pedicle of vertebral arch be from disconnected lengthening etc.Pedicle of vertebral arch extends fixture by extending from the pedicle of vertebral arch of having no progeny, and realizes the area that expands canalis spinalis, intervertebral foramina, improves clinical symptoms.This fixture can improve Wicresoft's degree, the raising of laminoplasty and put nail degree of accuracy, reduces operation wound, shortens operation and postoperative rehabilitation time etc.
Publication number is that the application for a patent for invention of CN101695453A discloses a kind of vertebral arch pedicle extension device, this device comprises front nail, core bar, rear nail and holder, described core bar is hollow structure, its middle part is provided with the through hole of connection, core bar front end is threaded with front nail, core bar rear end is socketed with described rear nail, and core bar and rear nail are slidably connected; Described holder is fixedly connected on the rear end of rear nail, and makes core bar relative with rear nail fixing.Scheme utilization described in above-mentioned patent application is followed closely afterwards surperficial screw thread rear nail is fixed in disconnected pedicle of vertebral arch, then turn holder (nut) make core bar together with front nail in rear nail slides forwards, and then promote vertebral body and move to the direction away from pedicle of vertebral arch, to reach the object that expands canalis spinalis and intervertebral foramina.But still there is following deficiency in the scheme described in above-mentioned patent application: the surperficial screw thread of nail had both been born the task of connecting pedicle of vertebral arch and bear again the task (seeing Fig. 2 of this patent application) of holder (nut) after (1), because after this following closely surperficial screw thread, just can not select tapping screw thread, being connected between rear nail and pedicle of vertebral arch is obviously firm not; (2) owing to having relatively large fit clearance between core bar and rear nail, and after vertebral body and pedicle of vertebral arch are strutted, core bar and holder (nut) can not be fixed together, so under the effect of external force, core bar not only can rock together with vertebral body, and can continue towards move (promoting vertebral body moves to the direction away from pedicle of vertebral arch) away from the direction of holder (nut), therefore obviously existence is fixing not firm, the defect of poor stability; (3) front nail is only inserted in and installs in pilot hole, exists too vertebral body towards the risk moving away from the direction of holder (nut).
Described in Granted publication CN201912218U utility application, scheme is on scheme basis, to set up a scale described in the application for a patent for invention that is CN101695453A at publication number to improve and form, and therefore having equally above-mentioned publication number is the deficiency of the application for a patent for invention of CN101695453A.
Summary of the invention
In view of above shortcomings in prior art, technical problem to be solved in the utility model is to provide a kind of modified model vertebral arch pedicle extension device, this device not only can be avoided promoting vertebral body to the risk moving away from pedicle of vertebral arch direction, and has advantages of stability.
The scheme that this utility model solves the problems of the technologies described above is as follows:
A kind of modified model vertebral arch pedicle extension device, this device by core bar and the front rivet nut and the rear rivet nut that are threaded in respectively core bar two form, wherein, the outer surface of front rivet nut and rear rivet nut is provided with the tapping screw thread that pitch is equal, it is characterized in that, between described front rivet nut and rear rivet nut, be provided with connected structure, when the two is plugged in together, form a pedicle screw; Described pedicle screw is provided with screwed hole along axial line, and the rotation direction of the female thread in this screwed hole is identical, and the pitch that is arranged in rear rivet nut female thread is greater than the pitch that is arranged in front rivet nut female thread; Two of described core bar be respectively equipped with front rivet nut and rear rivet nut in the external screw thread that matches of set female thread, middle part is polished rod, and the length of core bar equals described front rivet nut and rear rivet nut is plugged in together the length of formed pedicle screw and the length sum of the default prolongation of pedicle of vertebral arch.
In this utility model technique scheme, bearing due to described socket connection structure of task is, the pedicle screw that front rivet nut and rear rivet nut is plugged on to formation can provide needed moment of torsion when being screwed in lumbar vertebra in bullport, therefore described socket connection structure can be the various syndetons that described moment of torsion can be provided, and in this structure, more satisfactory scheme has following two kinds.Wherein,
The first scheme is, in the described front rivet nut head relative with rear rivet nut, and a head outer-hexagonal, another head is provided with the interior hexagonal matching with described outer-hexagonal; And after front rivet nut and rear rivet nut are plugged in together, the set tapping screw thread of the two outer surface is continuous.
Another kind of scheme is, on the described front rivet nut end face relative with rear rivet nut, and staggered fan-shaped pawl and the fan groove of being provided with respectively, described fan-shaped pawl is with fan groove cross section fan-shaped that shape is identical, area is equal; And, after front rivet nut and rear rivet nut are plugged in together, the set tapping screw thread of the two outer surface be same taenidium tooth in the length of interval of fan-shaped pawl from disconnected.
In this utility model technique scheme, described core bar can prolong axis and be provided with centre bore, the surface of described front rivet nut some apertures that also can distribute, so that the passage consisting of described centre bore and aperture in operation is strengthened loose sclerotin to some bone cements of bone perfusion in vivo.These are all that those of ordinary skills are easy to expect.
Modified model vertebral arch pedicle extension device described in this practicality is compared with common pedicle screw, except having additional core bar, also having a significant difference is exactly being pegged graft and formed by front rivet nut and rear rivet nut of described pedicle screw, if therefore the two peg graft after the tapping screw thread dislocation of outer surface, shoot in process, will cause after rivet nut front rivet nut silk tooth of tapping on lumbar vertebra is destroyed.In order to solve the problems of the technologies described above, a kind of reliable method that the inventor recommends is, before processing tapping screw thread, first clamping after front rivet nut and the grafting of rear rivet nut is fixed together (state as shown in Figure 1), then the tapping screw thread on front rivet nut and rear rivet nut surface is processed in a feed.
In addition, in modified model vertebral arch pedicle extension device described in the utility model, in described rear rivet nut, the pitch of female thread is greater than the pitch of female thread in front rivet nut, and be provided with socket connection structure between front rivet nut and rear rivet nut, therefore by front rivet nut and rear rivet nut respectively after two is screwed to core bar, must fix front rivet nut and rear rivet nut do not allow them rotate and turn core bar and could utilize after the pitch difference of female thread in female thread and front rivet nut in rivet nut, front rivet nut and rear rivet nut are plugged in together.
Vertebral arch pedicle extension device described in the utility model has following beneficial effect compared with prior art:
1, the outer surface of front rivet nut and rear rivet nut is provided with the tapping screw thread that pitch is equal, when the two is plugged in together, forms a pedicle screw, and also adopts and be threaded between rear rivet nut and core bar, therefore can avoid vertebral body and the risk moving along core bar axis.
2, between rear nail and pedicle of vertebral arch, adopt tapping screw thread to be connected, can bear larger axial force, relatively stable reliable.
3, in rear rivet nut, the pitch of female thread is greater than the pitch of female thread in front rivet nut, therefore when turning core bar, is equivalent to after supporting or opposing from disconnected pedicle of vertebral arch, to pass, and more meets the physiological feature of human body compared with prior art.
4, the length of core bar equals the default extending length sum of described blind hole depth and pedicle of vertebral arch, therefore, will strut after predeterminable range from disconnected pedicle of vertebral arch, core bar can indentation before in rivet nut, obviously improved overall fixing stability.
Accompanying drawing explanation
Fig. 1 and Fig. 2 are the structural representation of a specific embodiment of modified model vertebral arch pedicle extension device described in the utility model; Wherein Fig. 1 is front view, A-A profile (amplification) that Fig. 2 is Fig. 1.
Fig. 3 be Fig. 1 and embodiment illustrated in fig. 2 in the structural representation of front rivet nut and rear rivet nut, in figure, arrow represents the grafting direction of the two.
Fig. 4 is the structural representation of Fig. 1 and middle core bar embodiment illustrated in fig. 2.
Fig. 5 and Fig. 6 are modified model vertebral arch pedicle extension device installment state figure described in the utility model; Wherein, Fig. 5 is the state diagram before pedicle of vertebral arch extends, and Fig. 6 is the state diagram after pedicle of vertebral arch extends.
Fig. 7 and Fig. 8 are the structural representation of another specific embodiment of modified model vertebral arch pedicle extension device described in the utility model; Wherein Fig. 7 is front view, B-B profile (amplification) that Fig. 8 is Fig. 7.
Fig. 9 be Fig. 7 and embodiment illustrated in fig. 8 in the structural representation of front rivet nut and rear rivet nut, in figure, arrow represents the grafting direction of the two.
The specific embodiment
Example 1
Referring to Fig. 1 and Fig. 2, whole vertebral arch pedicle extension device is comprised of core bar 1 and the front rivet nut 2 and the rear rivet nut 3 that are threaded in respectively core bar 1 two, and wherein, the outer surface of front rivet nut and rear rivet nut is provided with the tapping screw thread that pitch is equal.
Referring to Fig. 3 and in conjunction with Fig. 2 and Fig. 1, in front rivet nut 2 head relative with rear rivet nut 3, the head of front rivet nut 2 is provided with interior hexagonal 4, and the head of rear rivet nut 3 is provided with the outer-hexagonal 5 mating with the set interior hexagonal phase of head of front rivet nut 2.The connected structure that described interior hexagonal 4 and outer-hexagonal 5 form between front rivet nut 2 and rear rivet nut 3, form a pedicle screw, and the set tapping screw thread of the two outer surface is continuous (see figure 1) after current rivet nut 2 and rear rivet nut 3 socket connections.
Referring to the pedicle screw being formed after the front rivet nut 2 of Fig. 3 and rear rivet nut 3 socket connections, along axial line, be provided with screwed hole 6, the rotation direction of the female thread in this screwed hole 6 is identical, and the pitch that is arranged in rear rivet nut 3 female threads is greater than the pitch that is arranged in front rivet nut 2 female threads.
Referring to Fig. 4, two of core bar 1 be respectively equipped with front rivet nut 2 and rear rivet nut 3 in the external screw thread that matches of set female thread, middle part is polished rod; The length of described core bar 1 equals front rivet nut 2 and is plugged in together the length of formed pedicle screw and the length sum of the default prolongation of pedicle of vertebral arch with rear rivet nut 3.
Referring to Fig. 5 and Fig. 6 and in conjunction with Fig. 1, the installation method of modified model vertebral arch pedicle extension device described in the utility model is as described below:
(1) in the pedicle of vertebral arch 11 that needs on lumbar vertebra 10 with power drill to extend, bore bullport;
(2) front rivet nut 2 and rear rivet nut 3 are installed on core bar 1 and make front rivet nut 2 and rear rivet nut 3 closely be plugged in together (state as shown in Figure 1) and form vertebral arch pedicle extension device 9, then whole device is shot to the interior (see figure 5) of lumbar vertebra 10 along bullport;
(3), from disconnected pedicle of vertebral arch 11, turn after the indentation that core bar 1 makes it in rivet nut 3 and guarantee the two the concordant (see figure 6) that gets final product of head.
Example 2
Referring to Fig. 7 and Fig. 8, the connected structure in the present embodiment between front rivet nut 2 and rear rivet nut 3 is different, and other structure is same as Example 1.In the present embodiment, described connected structure consists of staggered fan-shaped pawl 7 and the fan groove 8 being located on front rivet nut 2 end face relative with rear rivet nut 3, and wherein said fan-shaped pawl 7 is with the cross section of fan groove 8 fan-shaped that shape is identical, area equates.After current rivet nut 2 is plugged in together with rear rivet nut 3, the set tapping screw thread of the two outer surface be same taenidium tooth in the length of interval of fan-shaped pawl 7 from disconnected.
Claims (3)
1. a modified model vertebral arch pedicle extension device, this device by core bar and the front rivet nut and the rear rivet nut that are threaded in respectively core bar two form, wherein, the outer surface of front rivet nut and rear rivet nut is provided with the tapping screw thread that pitch is equal, it is characterized in that, between described front rivet nut and rear rivet nut, be provided with connected structure, when the two is plugged in together, form a pedicle screw; Described pedicle screw is provided with screwed hole along axial line, and the rotation direction of the female thread in this screwed hole is identical, and the pitch that is arranged in rear rivet nut female thread is greater than the pitch that is arranged in front rivet nut female thread; Two of described core bar be respectively equipped with front rivet nut and rear rivet nut in the external screw thread that matches of set female thread, middle part is polished rod, and the length of core bar equals described front rivet nut and rear rivet nut is plugged in together the length of formed pedicle screw and the length sum of the default prolongation of pedicle of vertebral arch.
2. a kind of modified model vertebral arch pedicle extension device according to claim 1, it is characterized in that, described connected structure is: in the described front rivet nut head relative with rear rivet nut, and a head outer-hexagonal, another head is provided with the interior hexagonal matching with described outer-hexagonal; And after front rivet nut and rear rivet nut are plugged in together, the set tapping screw thread of the two outer surface is continuous.
3. a kind of modified model vertebral arch pedicle extension device according to claim 1, it is characterized in that, described connected structure is: on the described front rivet nut end face relative with rear rivet nut, staggered fan-shaped pawl and the fan groove of being provided with respectively, described fan-shaped pawl is with fan groove cross section fan-shaped that shape is identical, area equates; And, after front rivet nut and rear rivet nut are plugged in together, the set tapping screw thread of the two outer surface be same taenidium tooth in the length of interval of fan-shaped pawl from disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320764621.8U CN203564323U (en) | 2013-11-27 | 2013-11-27 | Improved vertebral pedicle extending device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320764621.8U CN203564323U (en) | 2013-11-27 | 2013-11-27 | Improved vertebral pedicle extending device |
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| Publication Number | Publication Date |
|---|---|
| CN203564323U true CN203564323U (en) | 2014-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320764621.8U Expired - Lifetime CN203564323U (en) | 2013-11-27 | 2013-11-27 | Improved vertebral pedicle extending device |
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| Country | Link |
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| CN (1) | CN203564323U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104887300A (en) * | 2015-05-26 | 2015-09-09 | 王欢 | Split lengthening pedicle screw |
| CN116672607A (en) * | 2023-07-03 | 2023-09-01 | 北京微脊医疗科技有限公司 | Implantable electrical stimulator, implantation method and electrical stimulation device |
-
2013
- 2013-11-27 CN CN201320764621.8U patent/CN203564323U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104887300A (en) * | 2015-05-26 | 2015-09-09 | 王欢 | Split lengthening pedicle screw |
| CN116672607A (en) * | 2023-07-03 | 2023-09-01 | 北京微脊医疗科技有限公司 | Implantable electrical stimulator, implantation method and electrical stimulation device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |
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| CX01 | Expiry of patent term |