CN202365899U - One-way pedicle screw with rotatable type nail cap - Google Patents
One-way pedicle screw with rotatable type nail cap Download PDFInfo
- Publication number
- CN202365899U CN202365899U CN2011204392155U CN201120439215U CN202365899U CN 202365899 U CN202365899 U CN 202365899U CN 2011204392155 U CN2011204392155 U CN 2011204392155U CN 201120439215 U CN201120439215 U CN 201120439215U CN 202365899 U CN202365899 U CN 202365899U
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- nail
- head
- pedicle screw
- screw
- nail cap
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- Expired - Fee Related
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Abstract
The utility model relates to a one-way pedicle screw with a rotatable type nail cap, which is composed of the nail cap, a nail body and a middle body. The nail body penetrates through the nail cap and is limited and fixed through the middle body, a U-shaped deep groove is arranged on the nail cap, internal threads are arranged on the inner walls of the two sides of the deep groove, a cylindrical surface and a transitional spherical mortar cup are arranged on the inner side of the lower end of the nail cap, and a through hole is arranged on the nail cap. The U-shaped groove is arranged at the upper end of the middle body, a through hole is arranged in the middle, a lower end face is a plane, and two sides of the middle body are limited and fixed with the nail cap through riveting. An inner hexagonal hole is arranged on the head portion of the nail body and used for nailing, and a cylinder and a spherical mortar body are arranged on the head portion to be matched with the cylindrical surface and the transitional spherical mortar cup at the lower end of the nail cap to achieve rotation of the head. The upper end of the head is a plane and is matched with the lower end face of the middle body to limit and achieve one-way axial rotation. The one-way pedicle screw has the advantages of being capable of achieving the one-way axial rotation between the nail cap and the nail body, and achieving functions by being matched with the cylindrical surface and the transitional spherical mortar cup inside the nail cap and limitation of the lower end face of the middle body.
Description
[technical field]
This utility model relates to the spinal surgery technical field of medical instruments, specifically, is the unidirectional pedicle screw of a kind of head of a nail rotatable type.
[background technology]
At present spinal column is followed closely excellent internal fixation system and is being carried out being widely used for realizing aspect spinal injury and the treatment of diseases resetting and fixing of spinal column.Usually securing members such as pedicle screw, hook are implanted and fixed, connect through pitman and play a supportive role with vertebral body.
The pedicle screw that uses clinically mainly is divided into unidirectional pedicle screw and universal pedicle screw.Universal pedicle screw is because its universal characteristic is promptly followed closely the three-dimensional rotation that the body and the head of a nail can be made certain angle.Even the pedicle screw of implanting can not also can cooperate inserting of rod through the direction and the angle of adjustment screw head of a nail U type groove fully on same straight line, reduce the difficulty of curved rod.Universal but then pedicle screw only has tractive and compression to the spinal column rear pillar, and is very little to the effect that struts of front pillar, can only carry out limited resetting to hindering vertebra.And traditional unidirectional pedicle screw has and well struts and pressurization function; But, often do not put the rod difficulty on same plane because of U type groove at a plurality of unidirectional pedicle screw of the same side because after the screw implantation, head of a nail direction is fixed; And in the art if screw is adjusted; As adjust height or rollback etc., may reduce the hold of screw, and then reduce internal fixation intensity.
One Chinese patent application numbers 200880019910.7 relates to buffer type vertebral pedicle screw; Comprise the body of screw, bearing block, fastening bolt and dead ring, wherein, the body of screw is implanted in the pedicle of vertebral arch; Bearing block is installed to the top of the body of screw; And have groove that is used to place bar and the threaded portion that is used for fixing fastening bolt, the bar of fastening bolt below extruding when being screwed into downwards places it, and dead ring is inserted in the bearing block.Pedicle screw further comprises packing ring; This packing ring places on the outer surface of head of screw of the body of screw of bearing block; This packing ring is installed is positioned at the dead ring on its top, and this packing ring adapts with the head of screw of the body of screw on its crooked inner surface, so that this packing ring and head of screw are in slidable contact with each other with part contact; Thus, whole bar side assembly can slide mobile on all directions with respect to the body of screw.
One Chinese patent application numbers 200910192726.9 relates to pedicle screw; This pedicle screw comprises nail tail and nail body; The nail tail is provided with spheric mortar cup; Rear end at the nail body is provided with spheric mortar body, and the mortar body is placed in the mortar cup and both are slidingly matched, and is provided with at the front end of nail tail the nail body is carried out spacing limiting section; Can make the patient have better physiological function, the while reduces the operation corresponding intervertebral disc of sections to greatest extent and closes on the regression of intervertebral disc mutually, improve to reach surgical effect at a specified future date in the recent period, and this screw low cost of manufacture, highly versatile.
One Chinese patent application numbers 201010133412.4 relates to pedicle screw; Comprise screw connection portion and the U type connecting portion of being located at the screw connection portion top; It is characterized in that: the cell wall outside of said U type connecting portion is provided with horizontal incisura; Said horizontal incisura is slit into U type coupling part the broken part that is positioned at epimere and can be fractureed and is positioned at hypomere and is used for placing and locks the sticking department of pitman, and wherein the groove depth of sticking department is more than or equal to the thickness sum of the diameter and the lock nut of pitman; Inboard and the cell wall inboard on sticking department top of the cell wall of broken part is provided with and is used for the female thread that is connected with lock nut; Its arrangement that helps pitman connects.
One Chinese patent application numbers 92204268.3 relates to the hollow pedicle screw, and the hollow pedicle screw is for being suitable for lumbar vertebra compression fracture, slippage, a kind of novel screw of breast lumbar vertebra tumor posterior approach; The former priority secondary of calibration boring is squeezed into, is extracted with the Ke Shi nail in the improvement operation, squeezes into for only once following closely with Ke Shi, then is inserted in Ke Shi nail and gimbal suspension and rod iron with novel screw and accomplishes arthrodesis jointly; Simplify the operation; In the operation adjustment easily, be difficult for overtaxing one's nerves through, be convenient to promote the use of.
At present, the report of the unidirectional pedicle screw of rarely seen head of a nail rotatable type.
[utility model content]
The purpose of this utility model is to overcome the deficiency of prior art, provides a kind of head of a nail rotatable type unidirectional pedicle screw.
The purpose of this utility model realizes through following technical scheme:
The unidirectional pedicle screw of a kind of head of a nail rotatable type, by the head of a nail, nail body and intermediate are formed, and the nail body passes the head of a nail, and spacing fixing through intermediate.
The described head of a nail has U moldeed depth groove, and deep trouth both sides inwall is provided with female thread, and inboard, head of a nail lower end is provided with the spherical mortar cup of inner cylinder face and transition, and has lateral aperture I.
Described intermediate upper end has U type groove, and the centre is provided with intermediate throughholes, and the lower surface is the plane, and its both sides are provided with lateral aperture II, the inboard face of cylinder of its external cylindrical surface and head of a nail coupling, and both sides are fixing spacing through the riveted joint and the head of a nail.
Described nail body head is provided with inner hexagonal hole, uses above nail; Head is provided with the face of cylinder and spherical mortar body, and the face of cylinder and the spherical mortar cup inboard with head of a nail lower end are complementary, and realizes the head rotation; The head upper end is a plane, cooperates with the lower surface of intermediate, so that spacing; Nail body body portion is provided with screw thread.
Described nail body can be hollow design or non-hollow design.The nail body of hollow design can be designed for micro-wound percutaneous hands art for hollow bore; Can also be provided with hole or groove in nail side side simultaneously for non through hole designs, be used to combine the hands art of bone cement injection; Also can be provided with hole or groove, be used to combine the Minimally Invasive Surgery of bone cement injection for not only comprising via design but also follow closely side side again.
The assemble flow of this utility model is: at first will follow closely body and pass head of a nail end vias, match with the spherical mortar cup and the face of cylinder of the head of a nail in its spherical mortar body and the face of cylinder; Intermediate is put into, and following transverse plane is pushed down nail body head upper surface; Through two-sided riveted joint the intermediate and the head of a nail are fixed at last.Assembling back nail body and intermediate can not be deviate from from the head of a nail, and assembling back nail body should be able to realize that the nail axon is to rotating freely with the head of a nail.
Compared with prior art, the good effect of this utility model is:
Can realize axially rotating freely between the head of a nail of this utility model and the nail body,, realize its spinfunction through the nail body face of cylinder, upper end and spherical mortar body and the inboard face of cylinder of the head of a nail and spherical mortar cup coupling; Cooperates through transverse plane under transverse plane and the intermediate on the nail body, the restriction head of a nail with follow closely body in axial rotation.
This utility model has the strut pressurization function identical with traditional unidirectional pedicle screw on the one hand, because its head of a nail and nail can axially rotate between body, makes and puts rod and be more prone on the other hand.
[description of drawings]
The structural representation of Fig. 1 this utility model.
Label in the accompanying drawing is: 1, the head of a nail, 11, U moldeed depth groove, 12, female thread, 13, the face of cylinder, 14, spherical mortar cup; 15, lateral aperture I, 2, intermediate, 21, U type groove, 22, intermediate throughholes, 23, transverse plane down; 24, lateral aperture II, 25, external cylindrical surface, 3, the nail body, 31, the face of cylinder; 32, spherical mortar body, 33, go up transverse plane, 34, screw thread, 35, hole, side or groove.
[specific embodiment]
The specific embodiment of the unidirectional pedicle screw of a kind of head of a nail rotatable type of this utility model below is provided.
Embodiment 1
See also accompanying drawing 1, the unidirectional pedicle screw of a kind of head of a nail rotatable type is by the head of a nail 1; Nail body 3 constitutes with intermediate 2; Realize fixing and spacingly through 2 pairs of heads of a nail of intermediate 1 and nail body 3, transverse plane 23 is being pressed screw head under the intermediate, simultaneously through with head of a nail two sides riveted and fixed; End structure is through being complementary with spherical mortar cup 14 with the inboard face of cylinder 13 of the head of a nail on the nail body.
The described head of a nail has U moldeed depth groove 11, and deep trouth both sides inwall is provided with female thread 12, and inboard, head of a nail lower end is provided with the spherical mortar cup 14 of inner cylinder face 13 and transition, and has through hole, and the side is provided with both sides face I15.
Described intermediate upper end has U type groove 21, and the centre is provided with intermediate throughholes 22, and the lower surface is plane 23, and its both sides are provided with lateral aperture II 24, its external cylindrical surface 25 and the inboard face of cylinder of the head of a nail 13 couplings, and both sides are fixing spacing through the riveted joint and the head of a nail.
Described nail body head is provided with inner hexagonal hole, uses above nail; Head is provided with the face of cylinder 31 and spherical mortar body 32, and the face of cylinder 13 inboard with head of a nail lower end is complementary with spherical mortar cup 14, realizes the head rotation; The head upper end is a plane 33, cooperates with the lower surface 23 of intermediate, so that spacing; Nail body body portion is provided with screw thread 34; The nail body is a hollow design, and has hole, side or groove 35.
This pedicle screw can realize following closely axon to rotating freely between the head of a nail and the nail body.During clinical operation, because its head of a nail axis is consistent with the ailhead axis, promptly its unipolarity can realize strutting and pressurization function; Owing to can realize following closely rotating freely of body axis direction between its head of a nail and nail body, therefore when placing pitman, be more prone on the other hand, make things convenient for operation technique.
The above only is the preferred implementation of this utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from this utility model design; Can also make some improvement and retouching, these improvement and retouching also should be regarded as in the protection domain of this utility model.
Claims (6)
1. the unidirectional pedicle screw of head of a nail rotatable type is characterized in that, by screw cap; Nail body and intermediate constitute; Through intermediate the head of a nail and nail body are realized fixing with spacing, transverse plane is being pressed screw head under the intermediate, simultaneously with head of a nail two sides riveted and fixed.
2. the unidirectional pedicle screw of a kind of head of a nail rotatable type as claimed in claim 1 is characterized in that the described head of a nail has U moldeed depth groove, and deep trouth both sides inwall is provided with female thread.
3. the unidirectional pedicle screw of a kind of head of a nail rotatable type as claimed in claim 1 is characterized in that inboard, described head of a nail lower end is provided with the spherical mortar cup of the face of cylinder and transition, and has through hole.
4. the unidirectional pedicle screw of a kind of head of a nail rotatable type as claimed in claim 1 is characterized in that, described intermediate upper end has U type groove, and the centre is provided with through hole, and the lower surface is the plane, and both sides are fixing spacing through the riveted joint and the head of a nail.
5. the unidirectional pedicle screw of a kind of head of a nail rotatable type as claimed in claim 1 is characterized in that described nail body head is provided with inner hexagonal hole; Nail body body portion is provided with screw thread.
6. the unidirectional pedicle screw of a kind of head of a nail rotatable type as claimed in claim 1 is characterized in that described nail body is hollow design or non-hollow design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204392155U CN202365899U (en) | 2011-11-08 | 2011-11-08 | One-way pedicle screw with rotatable type nail cap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204392155U CN202365899U (en) | 2011-11-08 | 2011-11-08 | One-way pedicle screw with rotatable type nail cap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202365899U true CN202365899U (en) | 2012-08-08 |
Family
ID=46589625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204392155U Expired - Fee Related CN202365899U (en) | 2011-11-08 | 2011-11-08 | One-way pedicle screw with rotatable type nail cap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202365899U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103405269A (en) * | 2013-07-22 | 2013-11-27 | 苏州欣荣博尔特医疗器械有限公司 | Spine screw with rotary screw seat |
| CN105266876A (en) * | 2015-11-05 | 2016-01-27 | 同济大学 | Fixation device for spinal minimally invasive surgeries |
| CN106806010A (en) * | 2015-12-02 | 2017-06-09 | 东北大学 | Thoracic and lumbar vertebral posterior fine motion fixed system |
-
2011
- 2011-11-08 CN CN2011204392155U patent/CN202365899U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103405269A (en) * | 2013-07-22 | 2013-11-27 | 苏州欣荣博尔特医疗器械有限公司 | Spine screw with rotary screw seat |
| CN105266876A (en) * | 2015-11-05 | 2016-01-27 | 同济大学 | Fixation device for spinal minimally invasive surgeries |
| CN106806010A (en) * | 2015-12-02 | 2017-06-09 | 东北大学 | Thoracic and lumbar vertebral posterior fine motion fixed system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120808 Termination date: 20191108 |