CN104840243B - Spine screw - Google Patents
Spine screw Download PDFInfo
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- CN104840243B CN104840243B CN201510293395.3A CN201510293395A CN104840243B CN 104840243 B CN104840243 B CN 104840243B CN 201510293395 A CN201510293395 A CN 201510293395A CN 104840243 B CN104840243 B CN 104840243B
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- screw
- thread
- screw thread
- spinal bone
- radially
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- 210000000988 bone and bone Anatomy 0.000 claims abstract description 38
- 239000004744 fabric Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 8
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000010883 osseointegration Methods 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- 238000013461 design Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000007943 implant Substances 0.000 description 3
- 230000001054 cortical effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 108010048734 sclerotin Proteins 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 206010003439 Artificial menopause Diseases 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 206010061363 Skeletal injury Diseases 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 206010039722 scoliosis Diseases 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
- A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Neurology (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
- Surgical Instruments (AREA)
Abstract
The invention provides a spine screw. The screw holding force and pulling resisting force are increased, the stable jointing of the screw in different bone regions is guaranteed effectively, and the fine effects are provided for promoting osseointegration promotion and guaranteeing long-term screw stability.
Description
Technical field
The present invention relates to orthopedic implant field, further to bone anchor apparatus in a kind of backbone prosthetic.
Background technology
Orthopaedics common disease, the such as protrasion of the lumbar intervertebral disci, spine fracture, scoliosis often need surgical menopause to control
Treat, spinal bone screw technique for fixing is then the common technology of bone surgery.At present most of screws are adopted in shank of screw main body
Single form is screwed, due to cortex bone it is different with the sclerotin of cancellous bone, the two regions to the hold of screw not yet
Together, if using the screw of single thread forms, screw extraction may be caused because of stress raisers, if screw thread is too
It is fine and close, then the depth of thread is just smaller, and otherwise screw rigidity is bad, but so dense screw thread is with spongiosa union effects not
It is good, the initial stage can be caused to fix unstable, if screw thread is too loose, in cortical bone region, it is unfavorable for Integrated implant, it is steady for a long time for screw
It is qualitative to there is also bad hidden danger.
Biomechanics Research shows that the hold of pedicle screw and bone interface is directly proportional with the area and depth that contact.
So increase the contact area of increase and sclerotin while the depth of screw thread, for the hold and resisting pull out forces meeting that improve screw
Produce very positive effect.But the depth of thread increases, the ring stress of screw increases simultaneously, if using traditional one
Formula rigidity screw, it is likely that cause the fracture of screw, so ensureing that fine motion of the screw on Impact direction is also requisite.
The content of the invention
To solve the above problems, the invention provides a kind of split type pedicle screw, compared to conventional screw, screw thread depth
Degree is amid a sharp increase.Increase thread surface contact area while screw thread is deepened relatively in cortex bone area, it is ensured that steady in a long-term
Effect.Simultaneously special surface texture is utilized in cancellous bone region, effectively facilitate bone uptake.The screw includes epimere and hypomere,
Epimere is connected with hypomere locking, and epimere includes head, bar portion and afterbody, and epimere bar portion has the first screw thread, in the first spiral shell
Line along longitudinal grooved and radially slotted is longitudinally and radially respectively equipped with, be disposed adjacent with the longitudinal grooved screw thread for screw thread it is prominent
Rise, screw hypomere includes second screw thread, the addendum width of the first screw thread is more than the addendum width of second screw thread, epimere tail
Portion has the third screw thread.
Further, longitudinal grooved is dovetail groove or curved groove.
Further, longitudinal grooved Breadth Maximum d1 radially is less than or equal to threaded bosses Breadth Maximum radially
d2。
Further, height h of the first screw thread maximum height radially with second screw thread radially is identical, is
1.3~1.6mm。
Further, second thread outer surface has fenestral fabric.
Further, fenestral fabric accounts for the 1/8 ~ 1/10 of second thread depth h.
Further, network structure is ring mesh tetrakaidecahedron lattice structure.
Further, the distance of relative two lattice planes of lattice structure is 0.01-0.05mm, wherein the tetrakaidecahedron
One face is parallel with the longitudinal axis.
Further, hypomere has hollow structure, and the hollow structure surface has internal thread.
Further, elastic thread overcoat is set in hypomere hollow structure, the elastic thread overcoat inner side is provided with inner groovy, bullet
Property thread jacket inner groovy internal diameter more than the third screw thread coil width, the third screw thread is located at the elastic thread overcoat
Inner groovy in formed integrative-structure, with the screw-internal thread fit locking.
The technique effect of the present invention：
（1）The upper semisection of split type screw improves the depth of thread simultaneously using unique screw thread fluting design, increased spiral shell
Line and the contact area of bone tissue, also add in addition the radial shear power of screw thread, and this structure is finer and close for relatively hard
Cortical area stablizing effect greatly improve, lower semisection coordinates unique surface roughness to set using the helicitic texture deepened
Meter, in cancellous bone region, reaches promotion bone uptake, reduces the effect of bone injury.
（2）Coordinated using screw thread between the upper-lower section of split type screw, and elastic thread is arranged at epimere tailing screw flight
Overcoat, is combined with hypomere internal thread, this unique combination, it is ensured that the overall jiggle effect of screw.
（3）There is ring gap, in the case of over-stressed, this gap can be oriented to spiral shell at split type mode connects for screw
Nail fracture zone, split-type design also facilitates takes out broken nail, conveniently overhauls.
Description of the drawings
Fig. 1 is the front view of split type spinal bone screw of the invention.
Fig. 2 is the partial enlarged drawing of screw upper section helicitic texture.
Fig. 3 is upper segment trailer schematic diagram.
Fig. 4 is the longitudinal sectional drawing of screw hypomere.
Fig. 5 is combined schematic diagram for screw upper section afterbody with elastic overcoat.
Fig. 6 is hypomere screw thread rough surface partial enlarged drawing.
Specific embodiment
The split type spinal bone screw of the present invention is described in further detail below by specific embodiment.
As Figure 1-3, body 1 is split type pedicle screw main body, and main body limits longitudinal axis Y, main body by titanium alloy or
PEEK materials are made, and the split type screw includes epimere 2 and hypomere 3（Combined with cortex bone and cancellous bone respectively）, epimere 2 includes
Head 21, bar portion 22, and afterbody 23, have the first helicitic texture 221, along longitudinal direction on the first helicitic texture in bar portion 22
Direction sets spaced fluting 222, and the shape of fluting can be trapezoidal groove, rectangular slot, or curved slot.Such as Fig. 2 institutes
Show, be disposed adjacent is corresponding threaded bosses 223 with fluting, and for confronting grooves, i.e., projection here is：The first spiral shell
Line is differed with prominence tooth top at fluting to the distance of interior bar, and in slotted section, screw thread tooth top to interior bar away from
From being also non-homogeneous value.The tooth top of fluting screw thread 222 to the distance of interior bar is more than or equal to 0.Longitudinal grooved 222 is radially gone up most
Big width d1 is less than or equal to threaded bosses Breadth Maximum d2 radially.In threaded bosses 223, radially it is additionally provided with 1 ~
2 road screw slottings 224.This fluting design increases the surface area that screw is contacted with bone, can effectively facilitate Integrated implant.This
Outward, the design of longitudinal grooved structure, makes the first screw thread increase shearing force on ring, is easy to screw to be easier in cortex bone
Enter nail.The outer surface of hypomere 3 is provided with second screw thread, and the tooth top width of second screw thread is less than the tooth top width of the first screw thread,
The pitch of second screw thread is more than or equal to the pitch of the first screw thread, the first screw thread depth capacity radially and second spiral shell
Line depth h radially is identical to be 1.3 ~ 1.6mm, preferred 1.5mm.In implantation process, hypomere initially enters screw way, less
Tooth top width can produce a pre-expansion tension force to cortex bone area, and segment structure is implanted into cortex bone area convenience in, at the same epimere holding compared with
Wide tooth top width, can increase the contact area with cortex bone, it is ensured that screw it is steady in a long-term.As in Figure 3-5, upper segment trailer
The third helicitic texture 231 is provided with, its pitch is more than or equal to second thread pitch.Hypomere 3 is hollow structure, with interior spiral shell
Line 31, its internal thread 31 is matched with the screw thread of the third screw thread 231, two sections is locked into connection by screw thread, in hypomere 3
The inner surface of hollow structure can also be designed to the conical surface, and the surface of corresponding afterbody 23 replaces screw thread with the conical surface, and both can also pass through
Taper fit is locked.The split type spinal bone screw also includes an elastic thread overcoat 4, and the inner side of elastic thread overcoat 4 is provided with
Spiral inside groove 41, is enclosed within the third screw thread 231 of afterbody, and the internal diameter of the inside groove 41 of the spiral sleeve is than the third thread helix
Big 1mm of width or so（Coil width is the maximum outside diameter of screw thread）, the starting point of elastic helix overcoat goes out can block with projection 42
In the screw thread of afterbody 23 close in the draw-in groove of starting point, it is ensured that both firmly connect.In this example case, the hollow structure of hypomere 3
The pitch of internal thread 31 be consistent with the pitch of elastic thread overcoat and the third screw thread.During installation, first by thread jacket 4
It is set on the third screw thread, in being then screwed into hypomere internal thread 31, because the internal diameter of the inside groove of thread jacket is than the third spiral shell
The coil width of line is big, so can ensure that adjacent vertebral produces fine motion when moving, and reduces the strong fixation of vertebra adjacent segment and makes
Into stress concentration, promote bone tissue integration.
Elastic helix jacket designs make to produce certain fine motion between screw upper section and hypomere, moreover it is possible to prevent on screw ring
Stress concentration, causes fracture.Even if screw stress is excessive, but split-type design is adopted, can be produced in two sections junction
Raw weak area, the weak area can be ruptured, so as to prevent integral type screw with guider screw when screw is over-stressed in weak area
Irregular fracture, it is difficult to cause to take nail, affects to overhaul.
As shown in fig. 6, the thread surface of lower semisection 3 is provided with coarse structure 32, the rough surface structure can be accounted for second
The whole part of screw thread, it is also possible to account for second thread surface product more than half, the coarse grids shape structure 321 is used
Lattice structure, different from other tridimensional networks, lattice structure due to be component fundamental unit, with more preferable
Stability and crushing resistance.Preferably supporting role is provided when adjacent vertebral applies pressure to nail-stick system, without as other
Network structure is equally directly just crushed.In order to further increase its bearing capacity, in the present embodiment, fenestral fabric 321 is adopted
It is the excellent ring mesh tetrakaidecahedron lattice structure of anti-pressure ability, improves in the case of being suitable for plane pressure-bearing and support
Property, in order to take into account manufacture difficulty and resistance to compression force intensity, the distance of two relative lattice planes up and down of the lattice structure is
0.01-0.05mm, preferably 0.02mm.One face of the ring mesh tetrakaidecahedron therein is in substantially parallel relationship to the longitudinal axis of shank of screw
Direction, is face stress when being so stressed, then is transmitted on other support crystallographic axis, rather than general cancellated stress, is protected
The compressive property on the screw surface of card.
The fenestral fabric 321 relative to highly about second screw thread of screw thread radially height 1/8th
To 1/10th.Certainly, its thickness can be configured as other numerical value.But blocked up setting, will affect the radial direction of screw thread high
Degree, this is stable for screw, and promotes effect that bone tissue grows into reduce on the contrary, and due to the present embodiment in it is netted
Structure 321 is to adopt lattice structure, and anti-pressure ability is far longer than general network structure, so cancellated thickness is screw thread
Radially high 1/8 ~ 1/10 is optimal.
In order that network structure 321 is preferably attached on the surface of hypomere screw thread, it is not easy to which integral shift is de-
Fall.Chemical surface treatment can be passed through on the surface of screw thread or the method for 3D printing forms rough surface 32, as shown in fig. 6,
The thickness of rough surface 32 is about 0.01-0.03mm.
Obtain through Biomechanics test, traditional Design of Screw Thread is compared in the helicitic texture design of above-mentioned split type screw,
Resisting pull out forces increase by 20 ~ 30N, with preferable fixed effect.
Split type spinal bone screw provided by the present invention is described in detail above, specific case used herein
The principle and embodiment of the present invention are set forth, the explanation of above example is only intended to the core for helping understand the present invention
Thought is thought.It should be pointed out that for the those of ordinary skill of art technology, on the premise of without departing from inventive principle, also
Some improvement and modification can be carried out to the present invention, these are improved and modification also falls into the protection domain of the claims in the present invention
It is interior.
Claims (10)
1. a kind of spinal bone screw, including epimere and hypomere, the epimere is connected with hypomere locking, and the epimere includes head
Portion, bar portion and afterbody, the epimere bar portion has the first screw thread, is longitudinally and radially respectively equipped with described the first screw thread edge
Longitudinal grooved and radially slotted, be disposed adjacent with the longitudinal grooved screw thread for threaded bosses, the screw hypomere includes the
Two kinds of screw threads, the addendum width of the first screw thread is more than the addendum width of second screw thread, and the upper segment trailer has the third
Screw thread.
2. spinal bone screw according to claim 1, it is characterised in that the longitudinal grooved is dovetail groove or curved groove.
3. spinal bone screw according to claim 2, it is characterised in that Breadth Maximum d1 radially is little for the longitudinal grooved
In equal to threaded bosses Breadth Maximum d2 radially.
4. the spinal bone screw according to claim 1, it is characterised in that described the first screw thread maximum height radially with
Height h radially is identical for second screw thread, is 1.3～1.6mm.
5. spinal bone screw according to claim 1, it is characterised in that second thread outer surface has latticed knot
Structure.
6. spinal bone screw according to claim 5, it is characterised in that the fenestral fabric accounts for second screw thread edge
The 1/8～1/10 of radial height h.
7. according to the arbitrary described spinal bone screw of claim 5,6, it is characterised in that the fenestral fabric is ring mesh ten
Tetrahedral lattice structure.
8. spinal bone screw according to claim 7, it is characterised in that relative two lattice planes of the lattice structure
Distance is 0.01-0.05mm, wherein the longitudinal axis general parallel orientation of the tetrakaidecahedron a face and shank of screw.
9. spinal bone screw according to claim 1, it is characterised in that the hypomere has hollow structure, the hollow knot
Structure surface has internal thread.
10. spinal bone screw according to claim 9, it is characterised in that set elastic thread in the hypomere hollow structure
Overcoat, the elastic thread overcoat inner side is provided with inner groovy, and the internal diameter of the elastic thread overcoat inner groovy is more than the third spiral shell
The coil width of line, described the third screw thread is located in the inner groovy of the elastic thread overcoat and forms integrative-structure, and described
Screw-internal thread fit is locked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510293395.3A CN104840243B (en) | 2015-06-02 | 2015-06-02 | Spine screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510293395.3A CN104840243B (en) | 2015-06-02 | 2015-06-02 | Spine screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104840243A CN104840243A (en) | 2015-08-19 |
| CN104840243B true CN104840243B (en) | 2017-05-10 |
Family
ID=53840512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510293395.3A Active CN104840243B (en) | 2015-06-02 | 2015-06-02 | Spine screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104840243B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105769323A (en) * | 2016-02-22 | 2016-07-20 | 运怡（北京）医疗器械有限公司 | Composite screw and composite fixing assembly |
| CN107007341B (en) * | 2017-05-22 | 2020-02-11 | 浙江德康医疗器械有限公司 | Cobalt chromium molybdenum chest waist way of escape nail stick system |
| CN110996820A (en) * | 2017-08-01 | 2020-04-10 | 华沙整形外科股份有限公司 | Spinal implant and method of making same |
| US10575886B2 (en) | 2018-05-09 | 2020-03-03 | Warsaw Orthopedic, Inc. | Bone screw and method of manufacture |
| US11191582B2 (en) | 2018-05-09 | 2021-12-07 | Warsaw Orthopedic, Inc. | Bone screw and method of manufacture |
| US11224470B2 (en) | 2018-05-09 | 2022-01-18 | Warsaw Orthopedic, Inc. | Bone screw and method of manufacture |
| US10993753B2 (en) | 2018-05-09 | 2021-05-04 | Warsaw Orthopedic, Inc. | Bone screw and method of manufacture |
| CN111544103A (en) * | 2019-02-12 | 2020-08-18 | 上海长征医院 | Spine fixing system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8192199B2 (en) * | 2006-11-15 | 2012-06-05 | Uri Arni | Dental implant for implanting an artificial tooth on the anterior portion of the mandible of a patient |
| MX2013006872A (en) * | 2010-12-15 | 2013-11-22 | Leo Arieh Pinczewski | Peek-rich bone screw. |
| CN102429716A (en) * | 2011-12-19 | 2012-05-02 | 北京爱康宜诚医疗器材股份有限公司 | Integrated-type internal set screw for vertebral column |
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2015
- 2015-06-02 CN CN201510293395.3A patent/CN104840243B/en active Active
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| CN104840243A (en) | 2015-08-19 |
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Effective date of registration: 20240409 Address after: G356, 3rd floor, building 1, yard 9, CHENGWAN street, Haidian District, Beijing 100094 Patentee after: Beijing natong Medical Technology Holding Co.,Ltd. Country or region after: China Patentee after: TIANJIN JINXINGDA INDUSTRIAL Co.,Ltd. Patentee after: TIANJIN ZHENGTIAN MEDICAL APPLIANCE Co.,Ltd. Address before: No. 15 Deshengmen West Street, Haidian District, Beijing 100082, Ocean Scenic Area, 8-2-1201 Patentee before: BEIJING NATON TECHNOLOGY GROUP Co.,Ltd. Country or region before: China Patentee before: TIANJIN JINXINGDA INDUSTRIAL Co.,Ltd. Patentee before: TIANJIN ZHENGTIAN MEDICAL APPLIANCE Co.,Ltd. |
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