CN100384385C - Anti-loosen cervical vertebrae anterior screw - Google Patents
Anti-loosen cervical vertebrae anterior screw Download PDFInfo
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- CN100384385C CN100384385C CNB2005101302565A CN200510130256A CN100384385C CN 100384385 C CN100384385 C CN 100384385C CN B2005101302565 A CNB2005101302565 A CN B2005101302565A CN 200510130256 A CN200510130256 A CN 200510130256A CN 100384385 C CN100384385 C CN 100384385C
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- screw
- spiral shell
- cervical vertebrae
- hollow
- shell core
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Abstract
An anti-loosening screw for the front channel of cervical vertebrae is composed of a turned-in screw core, an expansive screw core, and a hollow screw whose front part can be expanded by turning relative screw core in it to deform it and improve local bone density and bone strength.
Description
Invention field
The present invention relates to the special-purpose anterior cervical vertebrae titanium of a kind of orthopaedics plate bolt system, i.e. anti-loosen cervical vertebrae anterior screw wherein.Described screw comprises screw-in spiral shell core, bracing type spiral shell core, and the anterior hollow cervical vertebrae anterior screw that can be strutted.Wherein the hollow screw leading portion that is screwed in the cervical vertebral body is strutted, cause shape to change by in described hollow cervical vertebrae anterior screw, being screwed into difformity spiral shell core; Improve local bone density, bone strength simultaneously, thereby avoid cervical vertebrae anterior screw loosening and deviate from.
Technical background
In recent years, the research and development of cervical vertebra internal fixation system have obtained very great development, and emerging in large numbers of large quantities of novel cervical vertebra internal fixation systems makes spinal surgery obtain tremendous development.Wherein, anterior cervical vertebrae titanium plate bolt system is the main anterior cervical vertebrae internal fixation device of present clinical practice.But existing anterior cervical vertebrae titanium plate bolt fixedly behind the vertebral body, because of screw form does not change, becomes flexible, moves back the nail equivalent risk so exist.Especially in the face of sufferers of osteoporosis face the time, existing cervical vertebrae anterior screw easily produces loosening and deviates from, and causes operative failure.Therefore, need a kind of anti-loosen cervical vertebrae anterior screw effective, strong operability of invention effectively to address this problem.
Summary of the invention
In order to overcome the not available anti-loosening function of cervical vertebrae anterior screw of existing clinical practice, the invention provides a kind of anti-loosen cervical vertebrae anterior screw, comprising screw-in spiral shell core, bracing type spiral shell core and the anterior hollow cervical vertebrae anterior screw that can be strutted, wherein by the cervical vertebrae anterior screw front end is strutted because of being screwed into suitable spiral shell core, for example be to be umbrella to strut, thereby avoid cervical vertebrae anterior screw loosening and deviate from.
The present invention relates to a kind of anti-loosen cervical vertebrae anterior screw, comprising screw-in and bracing type spiral shell core, and the anterior cervical vertebrae anterior screw that can be strutted.Concrete, the cervical vertebrae anterior screw that described front portion can be strutted is hollow cervical vertebrae anterior screw.In order to guarantee that described hollow cervical vertebrae anterior screw has favorable elasticity modulus and compliance, the thickness of the tube wall of described screw should have proper range (for example preferred 0.1-0.5mm), so that after being screwed into suitable spiral shell core, strutted, particularly be umbrella and strut, should guarantee the mechanical strength of hollow screw simultaneously.
Described hollow cervical vertebrae anterior screw is screwed into the vertebral body of cervical vertebra for convenience, and the terminal nut of described hollow cervical vertebrae anterior screw has hollow cross or hollow interior hexagon spiral shell button.
In the present invention, described hollow cervical vertebrae anterior screw also has external screw thread, also have in its leading portion part, for example length is from about 1/2 part of about 1/16-of front end total length, preferably from about 1/3 part of about 1/16-of front end total length, preferably from about 1/4 part of about 1/16-of front end total length, preferably from about 1/6 part of about 1/16-of front end total length, preferably from about 1/8 part of about 1/16-of front end total length, preferably from about 1/10 part of about 1/16-of front end total length, preferably from about 1/12 part of about 1/16-of front end total length, at least two, preferred three, article four,, article five,, article six,, article seven,, article eight,, article ten,, article 12, the slit of or more running through whole screw tube wall.
The internal diameter of hollow cervical vertebrae anterior screw is tapered by the tip forward extreme direction in leading portion slit appearance place, for example, linearly evenly is tapered along throwing face; Perhaps the internal diameter of hollow cervical vertebrae anterior screw is tapered in leading portion slit appearance place, and throwing face is the very little camber line of curvature.Accordingly, the tube wall progressive additive of described hollow cervical vertebrae anterior screw, inwall throwing face are very little camber line of curvature or straight line progressive additive.Except that the part that has the slit, the remainder of described hollow cervical vertebrae anterior screw all has female thread, being screwed into and taking out with convenient different spiral shell cores.For the ease of being screwed into and taking out of described hollow cervical vertebrae anterior screw, the terminal nut of described hollow cervical vertebrae anterior screw has hollow cross or hollow interior hexagon spiral shell button.
In the present invention, described spiral shell core comprises a kind of screw-in spiral shell core and a kind of bracing type spiral shell core.Wherein said screw-in spiral shell core shape and hollow cervical vertebrae anterior screw internal diameter fit like a glove, its leading portion part for example length is from the 1/16-1/2 of front end total length part, preferably from the 1/16-1/3 of front end total length part, preferably from the 1/16-1/4 of front end total length part, preferably from the 1/16-1/6 of front end total length part, preferably from the 1/16-1/8 of front end total length part, preferably from the 1/16-1/10 of front end total length part, preferably be tapered from the 1/16-1/12 of front end total length section diameter, do not have external screw thread, the footpath coincide within attenuating with hollow cervical vertebrae anterior screw leading portion just.
The remainder of described screw-in screw all has external screw thread, and the female thread of its external screw thread and hollow cervical vertebrae anterior screw cooperatively interacts, and is screwed into and takes out to realize the spiral shell core.After described screw-in spiral shell core is screwed into hollow cervical vertebrae anterior screw, can increases the mechanical strength of hollow cervical vertebrae anterior screw, and avoid osseous tissue to enter hollow cervical vertebrae anterior screw by its forward slit, convenient described cervical vertebrae anterior screw is implanted cervical vertebral body.
In the present invention, described bracing type spiral shell core is in its leading portion part, for example length is from the 1/16-1/2 of front end total length part, preferably from the 1/16-1/3 of front end total length part, preferably from the 1/16-1/4 of front end total length part, preferably from the 1/16-1/6 of front end total length part, preferably from the 1/16-1/8 of front end total length part, preferably from the 1/16-1/10 of front end total length part, preferably do not have external screw thread from the 1/16-1/12 of front end total length part, not corresponding with the part that hollow cervical vertebrae anterior screw leading portion attenuates with the length of externally threaded part.
Different with screw-in spiral shell core is that the diameter of its leading portion part of bracing type spiral shell core is not evenly to attenuate gradually, but keeps same diameter, is the very big camber line of curvature until becoming throwing face foremost.These characteristics make bracing type spiral shell core leading portion section diameter for example length for from the 1/16-1/2 of front end total length part, preferably from the 1/16-1/3 of front end total length part, preferably from the 1/16-1/4 of front end total length part, preferably from the 1/16-1/6 of front end total length part, preferably from the 1/16-1/8 of front end total length part, preferably from the 1/16-1/10 of front end total length part, preferably from the 1/16-1/12 of front end total length part, always greater than the corresponding internal diameter of hollow cervical vertebrae anterior screw leading portion.Except that above-mentioned part, the diameter of the remainder of described bracing type spiral shell core and hollow cervical vertebrae anterior screw internal diameter fit like a glove, also have the external screw thread that matches with described hollow cervical vertebrae anterior screw female thread, be used to increase the strength that struts hollow cervical vertebrae anterior screw when being screwed into described bracing type spiral shell core.Simultaneously, for the ease of being screwed into and taking out of described bracing type spiral shell core, hexagon or criss-cross spiral shell were buckled in described spiral shell core afterbody for example can have.
Clear and definite when locating, when in vertebral body, being screwed into cervical vertebrae anterior screw of the present invention, need to avoid osseous tissue to enter hollow cervical vertebrae anterior screw hollow cervical vertebrae anterior screw and supporting being screwed into of screw-in spiral shell core, increase the mechanical strength of hollow cervical vertebrae anterior screw simultaneously.When the described cervical vertebrae anterior screw front end that has screw-in spiral shell core be screwed into vertebral body place appropriate after, take out screw-in spiral shell core, be screwed into bracing type spiral shell core.Because the pairing internal diameter of the more hollow cervical vertebrae anterior screw leading portion of diameter part of bracing type spiral shell core leading portion part is thick, simultaneously because there is the longitudinal slot of many perforations in hollow cervical vertebrae anterior screw leading portion, the tube wall progressive additive, so when being screwed into bracing type spiral shell core, cervical vertebrae anterior screw leading portion part is strutted gradually, for example be umbrella and strut, shape changes, and causes local surrounding bone density and intensity to increase simultaneously.Therefore, cervical vertebrae anterior screw of the present invention is difficult for loosening and deviates from.
In order to reach designing requirement of the present invention, the material of cervical vertebrae anterior screw of the present invention and spiral shell core can be a titanium alloy, and this is because titanium alloy has ideal elastic modelling quantity, the favorable tissue compatibility and fatigue resistance, can retain for a long time in human body.Those of ordinary skills also know, as long as have ideal elastic modelling quantity, the material of the favorable tissue compatibility and fatigue resistance all can be used for preparing cervical vertebrae anterior screw of the present invention and spiral shell core.
The invention has the beneficial effects as follows: strutted in vertebral body by making cervical vertebrae anterior screw leading portion part, cause the increase of its surrounding bone density and intensity,, therefore be difficult for becoming flexible and deviating from simultaneously because the change of external shape has increased biomechanical strength.Simultaneously simple in structure, easy to operate.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
The perspective view of the hollow cervical vertebrae anterior screw of Fig. 1 and generalized section, wherein 1 is the slotted section that hollow cervical vertebrae anterior screw leading portion partly connects tube wall; 2 is the male thread portion of hollow cervical vertebrae anterior screw; 3 is the hollow cross spiral shell button part of the terminal nut of hollow cervical vertebrae anterior screw; 4 is hollow cervical vertebrae anterior screw tube wall part; The 5 tube wall parts that partly thicken for hollow cervical vertebrae anterior screw leading portion; 6 is hollow cervical vertebrae anterior screw leading portion part, and its internal diameter is tapered, and throwing face can be straight line or the very little camber line of curvature; 7 is the female thread of hollow cervical vertebrae anterior screw remainder.
The perspective view of Fig. 2 screw-in spiral shell core, wherein 8 is that the interior hexagon spiral shell of screw-in spiral shell core afterbody is buckled part; 9 is the male thread portion of screw-in spiral shell core; 10 is screw-in spiral shell core leading portion part, and its diameter is tapered.
The perspective view of Fig. 3 bracing type spiral shell core, wherein 11 is that the hexagon spiral shell is buckled part in the bracing type spiral shell core afterbody; 12 is the male thread portion of bracing type spiral shell core; 13 is the leading portion part of bracing type spiral shell core, and its diameter does not have significant change, and throwing face gradually becomes the very big camber line of curvature foremost.
The described anti-loosen cervical vertebrae anterior screw internal fixation system of Fig. 4 sketch map, Fig. 4 (a) are the perspective view of hollow cervical vertebrae anterior screw and the combination of screw-in spiral shell core; Fig. 4 (b) is the profile of hollow cervical vertebrae anterior screw and the combination of screw-in spiral shell core, and wherein screw-in spiral shell core 16 closely cooperates with hollow cervical vertebrae anterior screw 15; Fig. 4 (c) is the profile of hollow cervical vertebrae anterior screw and the combination of bracing type spiral shell core, wherein after the cervical vertebrae anterior screw 15 that has screw-in spiral shell core 16 is screwed into vertebral body, take out screw-in spiral shell core 16, bracing type spiral shell core 17 is screwed into hollow cervical vertebrae anterior screw 15, because described bracing type spiral shell core 17 point diameters are thick than screw-in spiral shell core, make that the leading portion of hollow cervical vertebrae anterior screw 15 is strutted, screw-in spiral shell core after obtaining strutting and hollow cervical vertebrae anterior screw combination 18.
The disclosed cervical vertebrae anterior screw of figure five (a) prior art is screwed into the vertebral body sketch map; (b) anti-loosen cervical vertebrae anterior screw of the present invention is screwed into the vertebral body sketch map, and wherein, anti-loosen cervical vertebrae anterior screw of the present invention is difficult for becoming flexible, deviating from because its leading portion 19 struts in vertebral body.
The specific embodiment
As shown in Figure 4: when being screwed into cervical vertebrae anterior screw, with hollow cervical vertebrae anterior screw 15 and screw-in spiral shell core 16 supporting being screwed into, avoid osseous tissue to enter hollow cervical vertebrae anterior screw, increase hollow cervical vertebrae anterior screw mechanical strength simultaneously, avoid the fracture of hollow screw leading portion or other accident takes place.When screw be screwed into vertebral body place appropriate after, take out screw-in spiral shell core 16, twist people's bracing type spiral shell core 17, because the more hollow cervical vertebrae anterior screw leading portion of bracing type spiral shell core leading portion diameter internal diameter is thick, its tube wall progressive additive is simultaneously because there are many longitudinal slots that connect tube wall in hollow cervical vertebrae anterior screw leading portion, so when being screwed into bracing type spiral shell core, the screw leading portion is umbrella gradually and is strutted, and shape changes.
As shown in Figure 5: cervical vertebrae anterior screw of the present invention is compared with existing cervical vertebrae anterior screw, and 19 front end shapes change in vertebral body, can cause local sclerotin intensity of hollow cervical vertebrae anterior screw leading portion and density to increase simultaneously.Therefore, cervical vertebrae anterior screw of the present invention is difficult for loosening and deviates from.
Claims (1)
1. the special-purpose anti-loosen cervical vertebrae anterior screw of an orthopaedics, it is made of hollow cervical vertebrae anterior screw, screw-in spiral shell core and bracing type spiral shell core,
Wherein said hollow cervical vertebrae anterior screw tube wall has external screw thread; Its rear end nut has hollow cross or hollow interior hexagon spiral shell button; Its leading portion part also has, length is for from two of about 1/2 part of about 1/16-of front end total length or more connect the slit of whole screw tube wall, the hollow screw internal diameter is tapered by the tip forward extreme direction in leading portion slit appearance place, and throwing face linearly or the very little camber line of curvature; Accordingly, the tube wall progressive additive, and all the other tube walls of the described hollow cervical vertebrae anterior screw outside place, described slit are partly with female thread;
Wherein said screw-in spiral shell core shape and hollow cervical vertebrae anterior screw internal diameter fit like a glove, its leading portion partial-length is for to be tapered from the 1/16-1/2 of front end total length section diameter, do not have external screw thread, the footpath matches within attenuating with hollow cervical vertebrae anterior screw leading portion just; The remainder of described screw-in screw all has external screw thread, and the female thread of its external screw thread and hollow cervical vertebrae anterior screw cooperatively interacts, and is screwed into and takes out to realize the spiral shell core; Described spiral shell core afterbody has interior hexagon or criss-cross spiral shell to buckle;
Wherein said bracing type spiral shell core is in its leading portion part, and length is not with the length of externally threaded part corresponding with the tapered part of hollow cervical vertebrae anterior screw leading portion for not having external screw thread from the 1/16-1/2 of front end total length part; The diameter of bracing type spiral shell core leading portion part is not evenly to attenuate gradually, but keeps same diameter, is the very big camber line of curvature until the throwing face that gradually becomes foremost; Threaded portion is not exceptionally to remove leading portion, the remainder diameter of described bracing type spiral shell core and hollow cervical vertebrae anterior screw internal diameter fit like a glove, also have the external screw thread that matches with described hollow pedicle female thread, be used to increase the strength that struts hollow cervical vertebrae anterior screw when being screwed into described bracing type spiral shell core, described spiral shell core afterbody has interior hexagon or criss-cross spiral shell to buckle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101302565A CN100384385C (en) | 2005-12-15 | 2005-12-15 | Anti-loosen cervical vertebrae anterior screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101302565A CN100384385C (en) | 2005-12-15 | 2005-12-15 | Anti-loosen cervical vertebrae anterior screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1981714A CN1981714A (en) | 2007-06-20 |
| CN100384385C true CN100384385C (en) | 2008-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101302565A Expired - Fee Related CN100384385C (en) | 2005-12-15 | 2005-12-15 | Anti-loosen cervical vertebrae anterior screw |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5209753A (en) * | 1989-11-03 | 1993-05-11 | Lutz Biedermann | Bone screw |
| CN1424000A (en) * | 2002-12-31 | 2003-06-18 | 中国人民解放军南京军区南京总医院 | Pier bridge style screw system for vertebral arch pedicle |
| US6648893B2 (en) * | 2000-10-27 | 2003-11-18 | Blackstone Medical, Inc. | Facet fixation devices |
| CN2601636Y (en) * | 2003-03-11 | 2004-02-04 | 王祥善 | Distensible and contractile screw for pedicle of vertebral arch |
| CN2647255Y (en) * | 2003-07-17 | 2004-10-13 | 雷伟 | Medical expansion type pediculus arcus vertebrac screw |
| US20050055027A1 (en) * | 2002-02-25 | 2005-03-10 | Yeung Jeffrey Eric | Expandable fastener with compressive grips |
| JP2005304607A (en) * | 2004-04-19 | 2005-11-04 | Mizuho Co Ltd | Fixation device for fracture treatment |
| CN2907562Y (en) * | 2005-12-15 | 2007-06-06 | 孙海飚 | Anti-loosing cervical vertebrae front screw |
-
2005
- 2005-12-15 CN CNB2005101302565A patent/CN100384385C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5209753A (en) * | 1989-11-03 | 1993-05-11 | Lutz Biedermann | Bone screw |
| US6648893B2 (en) * | 2000-10-27 | 2003-11-18 | Blackstone Medical, Inc. | Facet fixation devices |
| US20050055027A1 (en) * | 2002-02-25 | 2005-03-10 | Yeung Jeffrey Eric | Expandable fastener with compressive grips |
| CN1424000A (en) * | 2002-12-31 | 2003-06-18 | 中国人民解放军南京军区南京总医院 | Pier bridge style screw system for vertebral arch pedicle |
| CN2601636Y (en) * | 2003-03-11 | 2004-02-04 | 王祥善 | Distensible and contractile screw for pedicle of vertebral arch |
| CN2647255Y (en) * | 2003-07-17 | 2004-10-13 | 雷伟 | Medical expansion type pediculus arcus vertebrac screw |
| JP2005304607A (en) * | 2004-04-19 | 2005-11-04 | Mizuho Co Ltd | Fixation device for fracture treatment |
| CN2907562Y (en) * | 2005-12-15 | 2007-06-06 | 孙海飚 | Anti-loosing cervical vertebrae front screw |
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| Publication number | Publication date |
|---|---|
| CN1981714A (en) | 2007-06-20 |
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Granted publication date: 20080430 Termination date: 20121215 |