CN204734535U - Pedicle of vertebral arch screw is with preventing jackscrew soon - Google Patents
Pedicle of vertebral arch screw is with preventing jackscrew soon Download PDFInfo
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- CN204734535U CN204734535U CN201520343840.8U CN201520343840U CN204734535U CN 204734535 U CN204734535 U CN 204734535U CN 201520343840 U CN201520343840 U CN 201520343840U CN 204734535 U CN204734535 U CN 204734535U
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- jackscrew
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- revolving
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Abstract
The utility model discloses a pedicle of vertebral arch screw is with preventing jackscrew soon, including preventing jackscrew body soon, prevent that jackscrew body below is provided with a plurality of rigidity quils and time rigidity porous body soon, inferior rigidity porous body covers on the rigidity quil. Compared with the prior art, the utility model discloses a change and to prevent jackscrew structure soon, rely on entity quil and connective bar camber surface to form closure power, and inferior rigidity porous body makes and prevents soon that its rigidity entity quil of more smooth -going while of jackscrew rotating supports concave type plastic deformation down and has more increased and prevent jackscrew closure power soon, reduces the normal pressure under the circumstances that reaches equal locking effect, reduce and prevent revolving the jackscrew and explode an incidence.
Description
Technical field
This utility model relates to a kind of pedicle screw to be prevented revolving jackscrew, belongs to medical instruments field.
Background technology
The pitman of current pedicle screw relies on the frictional force between the rigid plane of jackscrew and pitman to lock, and the quality of locking effect and the size of frictional force have direct relation, and the larger locking effect of frictional force is better.When coefficient of friction is certain, frictional force is directly proportional to normal pressure, and increasing friction force must need to increase normal pressure.Normal pressure between jackscrew and pitman is from the pressure of jackscrew external screw thread and the fastening rear generation of pedicle nail female thread.Because planar rigidity contact friction force is less than normal and wayward, very easily produce overload when screwing jackscrew and compressing pitman, thus make jackscrew, pedicle screw screw thread produce breakoff phenomenon, i.e. quick-fried silk, thus cause the inefficacy of implant.
Such as: Chinese patent 201220597000.0 disclose a kind of can the Universal vertebral pedicle screw system of fine motion, this system forms by following closely rod and being located at least two group pedicle screw assemblies followed closely on rod, each group pedicle screw assemblies comprises nail seat, pedicle screw, limited block and plug screw, wherein, the head of a nail of pedicle screw is spherical; Be provided with through hole in nail seat body, through hole top is provided with female thread, and bottom is provided with second spherical recess; Limited block is arranged in the through hole of nail seat, the lower surface of limited block is provided with first spherical nest, this first spherical nest and second described spherical recess synthesize one by spherical head of a nail sphere hole in the inner, coordinate between this sphere hole and the spherical head of a nail of pedicle screw for dynamic.
Utility model content
The technical problems to be solved in the utility model is to provide one and prevents revolving jackscrew, avoids very easily producing overload when screwing jackscrew and compressing pitman, thus makes jackscrew, pedicle screw screw thread produce breakoff phenomenon.
The technical solution of the utility model is:
A kind of pedicle screw is anti-revolves jackscrew, comprises and prevents revolving jackscrew body, and described anti-revolving below jackscrew body is provided with some rigid body Spina jujubae and time rigid porous bodies, and secondary rigid porous bodies covers on rigid body Spina jujubae.
Further, rigid body Spina jujubae is evenly arranged on anti-revolving below jackscrew body.
A kind of pedicle screw, comprise screw, be arranged on the nail seat on screw top, the pitman be arranged in nail seat, be provided with in described nail seat and prevent revolving jackscrew, prevent that revolving jackscrew is threaded with nail seat, prevent revolving jackscrew and pitman close contact, the described anti-jackscrew that revolves comprises and anti-ly revolves jackscrew body, and described anti-revolving below jackscrew body is provided with some rigid body Spina jujubae and time rigid porous bodies, and secondary rigid porous bodies covers on rigid body Spina jujubae.
Further, rigid body Spina jujubae is evenly arranged on anti-revolving below jackscrew body.
Compared with prior art, this utility model is prevented revolving jackscrew structure by changing, entity Spina jujubae and pitman camber surface is relied on to form sealed power, and secondary rigid porous bodies make anti-revolve jackscrew turn more smooth-going while its rigid body Spina jujubae support under matrix plastic deformation further increase the sealed power of jackscrew, reducing normal pressure when reaching equal locking effect, reducing and preventing revolving the quick-fried silk incidence rate of jackscrew.
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model pedicle screw.
Fig. 2 is the structural representation that this utility model prevents revolving jackscrew.
Reference numeral: nail seat 1, pitman 2, anti-revolve jackscrew 3, rigid body Spina jujubae 4, secondary rigid porous bodies 5.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, this utility model is described.
As shown in Figure 1, a kind of pedicle screw, comprises screw, is arranged on the nail seat 1 on screw top, the pitman 2 be arranged in nail seat 1, is provided with anti-ly to revolve jackscrew 3 in described nail seat 1, prevent that revolving jackscrew is threaded with nail seat 1, prevent revolving jackscrew 3 and pitman 2 close contact.
As shown in Figure 2, the described anti-jackscrew 3 that revolves comprises and anti-ly revolves jackscrew body, and described anti-revolving below jackscrew body is provided with some rigid body Spina jujubae 4 and time rigid porous bodies 5, and secondary rigid porous bodies 5 covers on rigid body Spina jujubae 4.
Of the present utility model anti-revolve jackscrew 3 and pitman 2 contact side for the rigid body Spina jujubae 4 that covers by secondary rigid porous bodies 5, thus anti-revolving is made into rigid body Spina jujubae 4 with the contact of pitman 2 bottom jackscrew and contacted with pitman 2, rely on rigid body Spina jujubae 4 and pitman 2 curved surfaces to form sealed power, namely do not need very large normal pressure can complete good fixing.
This utility model is prevented revolving jackscrew 3 structure by changing, rigid body Spina jujubae 4 is relied on to form sealed power with pitman 2 camber surface, and secondary rigid porous bodies 5 make anti-revolve jackscrew 3 turn more smooth-going while its rigid body Spina jujubae 4 support lower matrix plastic deformation and further increase and prevent revolving the sealed power of jackscrew 3, reducing normal pressure when reaching equal locking effect, reducing and preventing revolving jackscrew 3 quick-fried incidence rates.
The foregoing is only detailed description of the invention of the present utility model; can not be interpreted as limiting scope of the present utility model with this, the equivalent distortion made in all scopes claimed at claims of the present utility model and the embodiment of change are all in this utility model scope required for protection.
Claims (4)
1. a pedicle screw revolves jackscrew with anti-, comprise and prevent revolving jackscrew body, it is characterized in that, described anti-revolving below jackscrew body is provided with some rigidity Spina jujubae (4) and time rigid porous bodies (5), and secondary rigid porous bodies (5) covers on rigidity Spina jujubae (4).
2. a kind of pedicle screw according to claim 1 revolves jackscrew with anti-, it is characterized in that, described rigidity Spina jujubae (4) is evenly arranged on anti-revolving below jackscrew body.
3. a pedicle screw, comprise screw, be arranged on the nail seat (1) on screw top, be arranged on the pitman (2) in nail seat (1), be provided with in described nail seat (1) and prevent revolving jackscrew (3), prevent that revolving jackscrew (3) is threaded with nail seat (1), prevent revolving jackscrew (3) and pitman (2) close contact, it is characterized in that, the described anti-jackscrew (3) that revolves comprises and anti-ly revolves jackscrew body, described anti-revolving below jackscrew body is provided with some rigidity Spina jujubae (4) and time rigid porous bodies (5), secondary rigid porous bodies (5) covers on rigidity Spina jujubae (4).
4. a kind of pedicle screw according to claim 3, is characterized in that, described rigidity Spina jujubae (4) is evenly arranged on anti-revolving below jackscrew body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520343840.8U CN204734535U (en) | 2015-05-25 | 2015-05-25 | Pedicle of vertebral arch screw is with preventing jackscrew soon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520343840.8U CN204734535U (en) | 2015-05-25 | 2015-05-25 | Pedicle of vertebral arch screw is with preventing jackscrew soon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204734535U true CN204734535U (en) | 2015-11-04 |
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| CN201520343840.8U Active CN204734535U (en) | 2015-05-25 | 2015-05-25 | Pedicle of vertebral arch screw is with preventing jackscrew soon |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104958100A (en) * | 2015-05-25 | 2015-10-07 | 创生医疗器械（中国）有限公司 | Anti-screwing jackscrew for pedicle screw |
-
2015
- 2015-05-25 CN CN201520343840.8U patent/CN204734535U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104958100A (en) * | 2015-05-25 | 2015-10-07 | 创生医疗器械（中国）有限公司 | Anti-screwing jackscrew for pedicle screw |
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| GR01 | Patent grant |