CN2907561Y - Anti-loosing pedicle screw - Google Patents
Anti-loosing pedicle screw Download PDFInfo
- Publication number
- CN2907561Y CN2907561Y CN 200520142662 CN200520142662U CN2907561Y CN 2907561 Y CN2907561 Y CN 2907561Y CN 200520142662 CN200520142662 CN 200520142662 CN 200520142662 U CN200520142662 U CN 200520142662U CN 2907561 Y CN2907561 Y CN 2907561Y
- Authority
- CN
- China
- Prior art keywords
- screw
- spiral shell
- pedicle screw
- shell core
- leading portion
- 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.)
- Expired - Lifetime
Links
Images
Abstract
This utility model relates to an orthopedic dedicated internal fixation device for spine, i.e. a locking vertebral arch pedicle screw. The screw consists of a threaded screw element, an inflated screw element and a hollow vertebral arch pedicle screw whose front section can be inflated. The front section of the vertebral arch pedicle screw that is driven into the vertebral body is inflated to cause the change of the shape by threading different-shape screw element in the vertebral arch pedicle screw. The local bone density and strength can be improved; thereby the vertebral arch pedicle screw is avoided against loosening and falling out.
Description
Affiliated technical field
This utility model relates to the special-purpose internal fixation of spine apparatus of a kind of orthopaedics, i.e. anti-loosen conal arch root screw.Described screw comprises screw-in spiral shell core, bracing type spiral shell core, and the leading portion part hollow pedicle screw that can be strutted.Wherein the pedicle screw leading portion of squeezing in the spinal vertebral is strutted, cause shape to change by in described hollow pedicle screw, being screwed into difformity spiral shell core; Improve local bone density, bone strength simultaneously, thereby avoid pedicle screw loosening and deviate from.
Technical background
In recent years, the research and development of spinal internal fixation system have obtained very great development, emerging in large numbers of large quantities of new spinal internal fixation systems such as spinal column general-purpose system (being designated hereinafter simply as USS) (AO/ASIF is organized in and improves the novel combination type spinal column general-purpose system that forms on its original spinal internal fixation system basis) etc. makes spinal surgery obtain tremendous development.But the pedicle screw of clinical practice does not at present have anti-loosening function.Schanz as USS follows closely after pedicle is implanted vertebral body, and its shape does not change, and exists and becomes flexible, moves back the nail equivalent risk.Especially in the face of sufferers of osteoporosis face the time, existing pedicle screw easily produces loosening and deviates from, and causes operative failure.And present only preventive measure is an injection bone cement in the vertebral body.Therefore, need a kind of anti-loosen conal arch root screw effective, strong operability effectively to address this problem.
Summary of the invention
In order to overcome the not available anti-loosening function of pedicle screw of existing clinical practice, the invention provides a kind of anti-loosen conal arch root screw, comprising screw-in spiral shell core, bracing type spiral shell core and the anterior hollow pedicle screw that can be strutted, wherein by the pedicle screw front end is strutted because of being screwed into suitable spiral shell core, for example be to be umbrella to strut, thereby avoid pedicle screw loosening and deviate from.
This utility model relates to a kind of anti-loosen conal arch root screw, comprising screw-in and bracing type spiral shell core, and the anterior pedicle screw that can be strutted.Concrete, the pedicle screw that described front portion can be strutted is the hollow pedicle screw.In order to guarantee that described hollow pedicle 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 pedicle screw is screwed into the vertebral body of vertebra for convenience, the back segment of described hollow pedicle screw, and preferably about 1/4 place of the about 1/16-to the screw total length from end can be for example outer-hexagonal type.
In the present invention, described hollow pedicle 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 pedicle 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 pedicle 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 pedicle 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 pedicle 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 pedicle screw, the afterbody of described hollow pedicle screw for example can have outer-hexagonal shape or criss-cross spiral shell buckle.
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 pedicle 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 lucky and hollow pedicle screw leading portion attenuated.
The remainder of described screw-in screw all has external screw thread, and the female thread of its external screw thread and hollow pedicle 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 the hollow pedicle screw, can increases the mechanical strength of hollow pedicle screw, and avoid osseous tissue to enter the hollow pedicle screw by its forward slit, convenient described pedicle screw pedicle is implanted 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 pedicle 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, throws the very big arc of the curvature of face until becoming 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 pedicle screw leading portion.Except that above-mentioned part, the diameter of the remainder of described bracing type spiral shell core and hollow pedicle screw internal diameter fit like a glove, also have the external screw thread that matches with described hollow pedicle screw female thread, be used to increase the strength that struts the hollow pedicle 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 the location, when in vertebral body, being screwed into pedicle screw of the present invention, need avoid osseous tissue to enter the hollow pedicle screw hollow pedicle screw and supporting being screwed into of screw-in spiral shell core, increase the mechanical strength of hollow pedicle screw simultaneously.When the described pedicle 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 diameter of bracing type spiral shell core leading portion part is thick than the pairing internal diameter of hollow pedicle screw leading portion part, simultaneously because there is the longitudinal slot of many perforations in hollow pedicle screw leading portion, the tube wall progressive additive, so when being screwed into bracing type spiral shell core, pedicle 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, pedicle 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 pedicle 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 pedicle screw of the present invention and spiral shell core.
The beneficial effects of the utility model are: strutted in vertebral body by making pedicle screw leading portion part, cause the increase of its surrounding bone density and intensity, simultaneously because the change of external shape has increased biomechanical strength, therefore be difficult for becoming flexible and deviating from.Simultaneously simple in structure, easy to operate.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
The perspective view and the generalized section of Fig. 1 hollow pedicle screw, wherein 1 is the slotted section that hollow pedicle screw leading portion partly connects tube wall; 2 is the male thread portion of hollow pedicle screw; 3 is the outer-hexagonal shape spiral shell button part of hollow pedicle tip of screw; 4 is hollow pedicle screw tube wall part; The 5 tube wall parts that partly thicken for hollow pedicle screw leading portion; 6 is hollow pedicle 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 pedicle 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 conal arch root screw internal fixation system of Fig. 4 sketch map, Fig. 4 (a) are the perspective view of hollow pedicle screw and the combination of screw-in spiral shell core; Fig. 4 (b) is the profile of hollow pedicle screw and the combination of screw-in spiral shell core, and wherein screw-in spiral shell core 16 closely cooperates with hollow pedicle screw 15; Fig. 4 (c) is the profile of hollow pedicle screw and the combination of bracing type spiral shell core, wherein after the pedicle 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 pedicle 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 pedicle screw 15 is strutted, screw-in spiral shell core after obtaining strutting and hollow pedicle screw combination 18.
The disclosed pedicle screw of figure five (a) prior art is screwed into the vertebral body sketch map; (b) anti-loosen conal arch root screw of the present invention is screwed into the vertebral body sketch map, and wherein, anti-loosen conal arch root 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 pedicle is screwed into pedicle screw, with hollow pedicle screw 15 and screw-in spiral shell core 16 supporting being screwed into, avoid osseous tissue to enter the hollow pedicle screw, increase hollow pedicle 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 bracing type spiral shell core leading portion diameter is thick than hollow pedicle screw leading portion internal diameter, its tube wall progressive additive is simultaneously because there are many longitudinal slots that connect tube wall in hollow pedicle 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: pedicle screw of the present invention is compared with existing pedicle screw, and 19 front end shapes change in vertebral body, can cause local sclerotin intensity of hollow pedicle screw leading portion and density to increase simultaneously.Therefore, pedicle screw of the present invention is difficult for loosening and deviates from.
Claims (1)
1. anti-loosen conal arch root screw, it is made of hollow pedicle screw, screw-in spiral shell core and bracing type spiral shell core, it is characterized in that:
Wherein said hollow pedicle screw tube wall has external screw thread; Its back segment part, about 1/4 place of the about 1/16-from end to the screw total length has that the outer-hexagonal spiral shell is buckled or the cross spiral shell is buckled; Its leading portion part also has length and is the slit from the whole screw tube wall of at least two perforation of about 1/2 part of about 1/16-of front end total length, 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; The tube wall progressive additive, and all the other tube walls of the described hollow pedicle screw outside place, described slit are partly with female thread;
Wherein said screw-in spiral shell core shape and hollow pedicle 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 matched within lucky and hollow pedicle screw leading portion attenuated; The remainder of described screw-in screw all has external screw thread, and the female thread of its external screw thread and hollow pedicle screw cooperatively interacts; 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 pedicle 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; Remove leading portion not threaded portion exceptionally, the remainder diameter of described bracing type spiral shell core and hollow pedicle screw internal diameter fit like a glove, and have the external screw thread that matches with described hollow pedicle female thread, 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 |
|---|---|---|---|
| CN 200520142662 CN2907561Y (en) | 2005-12-15 | 2005-12-15 | Anti-loosing pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520142662 CN2907561Y (en) | 2005-12-15 | 2005-12-15 | Anti-loosing pedicle screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2907561Y true CN2907561Y (en) | 2007-06-06 |
Family
ID=38126773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520142662 Expired - Lifetime CN2907561Y (en) | 2005-12-15 | 2005-12-15 | Anti-loosing pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2907561Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384386C (en) * | 2005-12-15 | 2008-04-30 | 孙海飚 | Anti-loosen conal arch root screw |
| CN107981926A (en) * | 2017-09-20 | 2018-05-04 | 北京航空航天大学 | The new resistance to plucking based on increases material manufacturing technology goes out pedicle nail |
| CN113729902A (en) * | 2021-09-18 | 2021-12-03 | 邦世科技(南京)有限公司 | Pedicle screw, distraction rod, heating rod and pedicle screw system |
| CN114376701A (en) * | 2021-12-21 | 2022-04-22 | 长春圣博玛生物材料有限公司 | High-strength screw |
-
2005
- 2005-12-15 CN CN 200520142662 patent/CN2907561Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384386C (en) * | 2005-12-15 | 2008-04-30 | 孙海飚 | Anti-loosen conal arch root screw |
| CN107981926A (en) * | 2017-09-20 | 2018-05-04 | 北京航空航天大学 | The new resistance to plucking based on increases material manufacturing technology goes out pedicle nail |
| CN113729902A (en) * | 2021-09-18 | 2021-12-03 | 邦世科技(南京)有限公司 | Pedicle screw, distraction rod, heating rod and pedicle screw system |
| CN114376701A (en) * | 2021-12-21 | 2022-04-22 | 长春圣博玛生物材料有限公司 | High-strength screw |
| CN114376701B (en) * | 2021-12-21 | 2023-02-14 | 长春圣博玛生物材料有限公司 | High-strength screw |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101066312B1 (en) | Multi-thread bone screw and method | |
| ES2407989T3 (en) | Bone screw | |
| US9301785B2 (en) | Spinal buttress plate | |
| US11602383B2 (en) | Devices for generating and applying compression within a body | |
| EP1639953A1 (en) | Intramedullary nail for the treatment of proximal femur fractures | |
| CN101484079A (en) | Bone anchor system and method of use | |
| CN2907561Y (en) | Anti-loosing pedicle screw | |
| CN207949887U (en) | A kind of orthopedic internal fixation system of modified form pedicle screw stick | |
| CN1830399A (en) | Nickel titanium temperature memory alloy centrum compression fracture orthopedic repositor and device | |
| CN2907562Y (en) | Anti-loosing cervical vertebrae front screw | |
| CN201299638Y (en) | Depth-adjustable internal fixation system used for reduction of spondylolisthesis | |
| CN108784815A (en) | A kind of closed bone cement pedicle screw of band guide front end | |
| CN100384386C (en) | Anti-loosen conal arch root screw | |
| CN100384385C (en) | Anti-loosen cervical vertebrae anterior screw | |
| CN208942334U (en) | A kind of closed bone cement pedicle screw of band guide front end | |
| CN209203377U (en) | A kind of soft tissue fixing belt line holdfast | |
| CN213606801U (en) | Spinal fixation rod | |
| CN219306894U (en) | Minimally invasive spine posterior internal fixation pedicle screw | |
| CN208492269U (en) | Extender in backbone pitman body | |
| CN212165872U (en) | Assembly for bone cement vertebral body forming and percutaneous pedicle screw internal fixation | |
| CN2529612Y (en) | Elastic artificial joint system of spinal column | |
| US20230190339A1 (en) | Device for the selective biological synthesis of a bone tissue | |
| KR200383131Y1 (en) | headless cone screw thread on outside of head | |
| CN216124537U (en) | Domino connecting device | |
| CN2693184Y (en) | Intervertebral merge appliance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080430 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |