CN105232131A - Lock type pedicle screw - Google Patents
Lock type pedicle screw Download PDFInfo
- Publication number
- CN105232131A CN105232131A CN201510780221.XA CN201510780221A CN105232131A CN 105232131 A CN105232131 A CN 105232131A CN 201510780221 A CN201510780221 A CN 201510780221A CN 105232131 A CN105232131 A CN 105232131A
- Authority
- CN
- China
- Prior art keywords
- screw
- pedicle screw
- threads
- type pedicle
- locking type
- 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.)
- Pending
Links
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
- A61B17/683—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin comprising bone transfixation elements, e.g. bolt with a distal cooperating element such as a nut
-
- 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
- A61B17/685—Elements to be fitted on the end of screws or wires, e.g. protective caps
-
- 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
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
- A61B17/7064—Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
-
- 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
- A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
-
- 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
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
- A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
- A61B17/862—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the periphery of the screw head
-
- 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
- A61B2017/564—Methods for bone or joint treatment
Abstract
The invention discloses a lock type pedicle screw which comprises a screw, a connecting part, an inner screw column and an outer locking part, wherein the connecting part is of a hollow structure and comprises a base part and an upper part with a groove; two opposite side walls are formed in the upper part; the base part is connected with the top of the screw; inner threads and outer threads are formed in the side walls; inner threads matched with the outer threads of the side walls are formed in the outer locking part; threads matched with the inner threads of the side walls are formed in the inner screw column. Due to adoption of an outer fastener and the inner screw column, the side walls of the lock type pedicle screw disclosed by the invention does not expand outwards or shrink inwards; due to adoption of the wedged threads of 30 degrees, the anti-loosening property of the threads is greatly improved, the inner and outer threads can be prevented from self-loosening which can result in embedded screw column loosening and fixation failure; inner and outer dual fixing systems can be provided, and the stability and reliability of the fixing systems can be improved.
Description
Technical field
The present invention relates to medical apparatus and instruments manufacture field, particularly relate to a kind of locking type pedicle screw.
Background technology
Pedicle screw coordinates with titanium alloy bar and forms a kind of frame-type fixed structure, and this structure can be used for treatment or corrects human spine's disease, the symptoms such as the spinal instability that such as scoliosis, spinal fracture, spinal column degeneration, lumbar vertebra protrusion etc. cause.The scope of application of this fixed structure comprises cervical vertebra, thoracic vertebra and lumbar vertebra.
Under normal circumstances, pedicle screw is made up of the threaded portion contacted with human bone, U-type groove part and embedded stud three part.Spinal internal fixation system is commonly referred to as nail-stick system, wherein rod is titanium alloy bar, in use procedure, titanium alloy bar is implanted in the U-type groove of pedicle screw, U-type groove band female thread, U-type groove is screwed into embedded stud, with fixing titanium alloy bar, make titanium alloy bar, pedicle screw and spinal column form the fixed structure of a frame-type, prevent spinal instability.
But in actual applications, due to the limitation of U-type groove structure, its diameter receives restriction, therefore the cell wall thickness of U-type groove is smaller.When embedded stud is screwed into U-type groove, form an active force expanded outwardly to cell wall, U-type groove cell wall is softened after this active force long duration of action or after repeatedly tightening/unscrew 3 times, loses locking effect, finally causes internal fixtion disabler.And because the Motion Transmission of human body is to the active force more complicated of nail-stick system, the helicitic texture of prior art easily causes screw thread from loosening, and then causes internal fixtion effect to be lost efficacy.
Summary of the invention
For solving the problems of the technologies described above, the object of this invention is to provide a kind of locking type pedicle screw.For achieving the above object, technical scheme provided by the present invention is as follows:
A kind of locking type pedicle screw, comprises screw, connecting portion, interior stud, outer lock piece, wherein:
Connecting portion is hollow structure, and it comprises base portion and establishes slotted top, and two relative sidewalls are formed at top, and base portion is connected with screw, and sidewall is provided with female thread and external screw thread;
Outer lock piece is provided with the female thread matched with the external screw thread of sidewall;
Interior stud is provided with the screw thread matched with the female thread of sidewall.
Preferably, the female thread of outer lock piece adopts 30 ° of wedge threads.
Preferably, the female thread of sidewall adopts 30 ° of wedge threads.
Preferably, the profile of base portion is spherical or that two ends are cut in the longitudinal direction elliposoidal, and the profile on top is that tool is jaggy cylindrical.
Preferably, the edge of sidewall is positioned within the top edge of base portion.
Preferably, external fastening element is outer hoop locking nut.
Preferably, screw and described connecting portion are integral structures.
Preferably, the base portion of connecting portion is provided with perforate, and the top of screw is rotatably installed in perforate.
As above, locking type pedicle screw of the present invention has following beneficial effect: (1), owing to being provided with external fastening element and interior stud, can keep the sidewall of pedicle screw neither to open also not adduction outward; (2) internal and external threads is set after carrying out repeatedly tightening/to unscrew, still can keeps larger pretightning force, prevent because cell wall is opened or adduction and the threaded engagement that causes is lost tight outward; (3) applying 30 ° of wedge threads and greatly improve locking thread performance, preventing internal and external threads from occurring to cause embedded stud to get loose from loosening, solid failure; (4) inside and outside dual fixed system is provided, strengthens stability and the reliability of fixed system.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of locking type pedicle screw of the present invention;
Fig. 2 is the schematic diagram of screw and connecting portion connection status;
Fig. 3 is the schematic diagram of pedicle screw body of the present invention;
Fig. 4 has been the schematic diagram of the locking type pedicle screw of the present invention of assembling;
Fig. 5 is the schematic diagram at internal and external threads junction surface.
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art can easily understand other advantages of the present invention and effect by the content disclosed in this description.The present invention can also be implemented by different detailed description of the invention or be applied, and the every details in this description also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Refer to accompanying drawing.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, component count, shape and size when the assembly relevant with the present invention being only shown in graphic but not implementing according to reality are drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can change, and its assembly layout kenel also may be more complicated.
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.
Fig. 1 shows locking type pedicle screw of the present invention, and this locking type pedicle screw comprises screw 100, connecting portion 200, interior stud 300, outer lock piece 400.As Figure 2-3, connecting portion 200 is hollow structure, and it comprises base portion 210 and establishes slotted top 220.The profile on top 220 is that tool is jaggy cylindrical, two relative sidewalls are formed at top 220, arrange fluting thus titanium alloy bar 500 (with reference to figure 1) is penetrated in the middle of the sidewall 220 of two opposition, sidewall is provided with female thread and external screw thread (not shown).The lower end of base portion 210 is connected to the top of screw 100, and its upper end is used for supporting titanium alloy bar 500, and the profile of base portion 210 is spherical or that two ends are cut in the longitudinal direction elliposoidal, and the base portion of elliposoidal can increase overall intensity.The sidewall edge on top 220 is positioned within the top edge of base portion 210.
Outer lock piece 400 is provided with the female thread (not shown) matched with the external screw thread of sidewall, and the female thread of outer lock piece 400 adopts 30 ° of wedge threads, the preferred outer hoop locking nut of outer lock piece.
Interior stud 300 is provided with the screw thread (not shown) matched with the female thread of sidewall, and the female thread of sidewall also adopts 30 ° of wedge threads.
Fig. 4 shows the locking type pedicle screw of assembled state.As can be seen from the figure, the lower end of connecting portion 200 is connected on hollow screw 100, titanium alloy bar 500 through be arranged at connecting portion 200 top 220 fluting and be supported in the top of base portion 210, interior stud 300 (not shown) has been screwed in the sidewall on top 220, in the drawings titanium alloy bar 500 is fixed by vertical direction, external fastening element 400 be threadably engaged the outside of two opposing sidewalls in top 220 and the lower end abutment of external fastening element 400 in the top of titanium alloy bar 500.External fastening element 400 can effectively prevent sidewall from expanding outwardly, and simultaneously, stud 300 can effectively prevent sidewall from inwardly shrinking, and therefore internal and external threads all there will not be from loosening.And be fixed except effect except interior stud 300 pairs of titanium alloy bars 500, external fastening element 400 and titanium alloy bar 500 are against also defining fixation to titanium alloy bar 500, dual so fixing more firm.
Fig. 5 shows the schematic diagram that 30 ° of wedge threads connect.As can be seen from Figure, the inclined-plane of one 30 ° is there is in being threaded, when tightening effect when being threaded, one of them cusp withstands on inclined-plane, under the effect of axle power, screw thread cusp produces micro-strain, make original linear contact lay be transformed into band contact, add contact area, thus make frictional force become magnitude to increase, and then produce very large coupling mechanism force, improve anti-loosening property.External fastening element 400 in the present invention and all adopt 30 ° of wedge threads to connect between the sidewall of connecting portion 200 and between sidewall and interior stud 300, can strengthen anti-loosing effect.In a preferred embodiment of the invention, screw and connecting portion are integral structures, belong to one-way type pedicle screw, and this structure is applicable to undesirably pedicle screw and produces in the situation of angular deflection.
In another preferred embodiment of the present invention, the base portion 210 of connecting portion is provided with perforate, and the top of screw 100 is rotatably installed in perforate, such as, can arrange the flange radially extended internally in the perforate of base portion 210, top globulate, spherical top and the Hp contacts of screw 100.Screw 100 can depart from vertical centrage, and can rotate around vertical centrage circumference.This structure can adapt to titanium alloy bar fixing requirement under specific circumstances.
The oscillation crosswise test of locking type pedicle screw of the present invention shows, under the oscillation crosswise condition of 240 seconds, locking type pedicle screw of the present invention can keep the pretightning force of 80%, substantially do not loosen, and adopt the pedicle screw of ordinary construction and screw thread under oscillation crosswise effect, pretightning force decays rapidly, and through the test of 60 seconds, interior stud got loose completely.Another advantage of locking type pedicle screw of the present invention is can repeatedly tighten to unscrew when performing the operation to adjust fixed angle, and does not affect the fixed effect of this pedicle screw and titanium alloy bar.
Above embodiment only have expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a locking type pedicle screw, is characterized in that, comprises screw, connecting portion, interior stud, outer lock piece, wherein:
Described connecting portion is hollow structure, and it comprises base portion and establishes slotted top, and two relative sidewalls are formed at top, and base portion is connected with screw, and described sidewall is provided with female thread and external screw thread;
Described outer lock piece is provided with the female thread matched with the external screw thread of described sidewall;
Described interior stud is provided with the screw thread matched with the female thread of described sidewall.
2. locking type pedicle screw according to claim 1, is characterized in that, the female thread of described outer lock piece adopts 30 ° of wedge threads.
3. locking type pedicle screw according to claim 1, is characterized in that, the female thread of described sidewall adopts 30 ° of wedge threads.
4. locking type pedicle screw according to claim 1, is characterized in that, the profile of described base portion is spherical or that two ends are cut in the longitudinal direction elliposoidal, and the profile on described top is that tool is jaggy cylindrical.
5. locking type pedicle screw according to claim 1, is characterized in that, the edge of described sidewall is positioned within the top edge of described base portion.
6. locking type pedicle screw according to claim 1, is characterized in that, described external fastening element is outer hoop locking nut.
7. locking type pedicle screw according to claim 1, is characterized in that, described screw and described connecting portion are integral structures.
8. locking type pedicle screw according to claim 1, is characterized in that, the base portion of described connecting portion is provided with perforate, and the top of described screw is rotatably installed in described perforate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510780221.XA CN105232131A (en) | 2015-11-16 | 2015-11-16 | Lock type pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510780221.XA CN105232131A (en) | 2015-11-16 | 2015-11-16 | Lock type pedicle screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105232131A true CN105232131A (en) | 2016-01-13 |
Family
ID=55030155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510780221.XA Pending CN105232131A (en) | 2015-11-16 | 2015-11-16 | Lock type pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105232131A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105963007A (en) * | 2016-07-08 | 2016-09-28 | 湖南百佳生物工程有限公司 | Minimally invasive pedicle screw system |
| CN113950300A (en) * | 2019-06-11 | 2022-01-18 | 德普伊新特斯产品公司 | Deformable thread locking structure and associated systems and methods |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1359660A (en) * | 2000-12-22 | 2002-07-24 | 卢茨·比德曼 | Mounting |
| US20040138660A1 (en) * | 2003-01-10 | 2004-07-15 | Serhan Hassan A. | Locking cap assembly for spinal fixation instrumentation |
| US20040158247A1 (en) * | 2003-02-07 | 2004-08-12 | Arthit Sitiso | Polyaxial pedicle screw system |
| US20040249380A1 (en) * | 2001-01-12 | 2004-12-09 | Craig Glascott | Polyaxial screw with improved locking |
| CN2742931Y (en) * | 2004-10-28 | 2005-11-30 | 长安仪器有限公司 | Rhachis locking steel nail |
| CN201104915Y (en) * | 2007-07-31 | 2008-08-27 | 陈扬 | Elastic internal fixer for spinal column |
| CN102579121A (en) * | 2012-03-09 | 2012-07-18 | 中国人民解放军第二军医大学 | Atlas vertebral pedicle screw |
| CN104783885A (en) * | 2015-05-06 | 2015-07-22 | 山东威高骨科材料股份有限公司 | Lower screw assembly type universal screw |
| CN104799927A (en) * | 2015-05-11 | 2015-07-29 | 北京贝思达生物技术有限公司 | Spinal internal fixation screw-rod device |
| CN205411281U (en) * | 2015-11-16 | 2016-08-03 | 苏州施必牢精密紧固件有限公司 | Locking formula pedicle of vertebral arch screw |
-
2015
- 2015-11-16 CN CN201510780221.XA patent/CN105232131A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1359660A (en) * | 2000-12-22 | 2002-07-24 | 卢茨·比德曼 | Mounting |
| US20040249380A1 (en) * | 2001-01-12 | 2004-12-09 | Craig Glascott | Polyaxial screw with improved locking |
| US20040138660A1 (en) * | 2003-01-10 | 2004-07-15 | Serhan Hassan A. | Locking cap assembly for spinal fixation instrumentation |
| US20040158247A1 (en) * | 2003-02-07 | 2004-08-12 | Arthit Sitiso | Polyaxial pedicle screw system |
| CN2742931Y (en) * | 2004-10-28 | 2005-11-30 | 长安仪器有限公司 | Rhachis locking steel nail |
| CN201104915Y (en) * | 2007-07-31 | 2008-08-27 | 陈扬 | Elastic internal fixer for spinal column |
| CN102579121A (en) * | 2012-03-09 | 2012-07-18 | 中国人民解放军第二军医大学 | Atlas vertebral pedicle screw |
| CN104783885A (en) * | 2015-05-06 | 2015-07-22 | 山东威高骨科材料股份有限公司 | Lower screw assembly type universal screw |
| CN104799927A (en) * | 2015-05-11 | 2015-07-29 | 北京贝思达生物技术有限公司 | Spinal internal fixation screw-rod device |
| CN205411281U (en) * | 2015-11-16 | 2016-08-03 | 苏州施必牢精密紧固件有限公司 | Locking formula pedicle of vertebral arch screw |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105963007A (en) * | 2016-07-08 | 2016-09-28 | 湖南百佳生物工程有限公司 | Minimally invasive pedicle screw system |
| CN113950300A (en) * | 2019-06-11 | 2022-01-18 | 德普伊新特斯产品公司 | Deformable thread locking structure and associated systems and methods |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160113 |