CN204049822U - A kind of hollow nail assembly for pole fracture under fixing patella - Google Patents
A kind of hollow nail assembly for pole fracture under fixing patella Download PDFInfo
- Publication number
- CN204049822U CN204049822U CN201420472125.XU CN201420472125U CN204049822U CN 204049822 U CN204049822 U CN 204049822U CN 201420472125 U CN201420472125 U CN 201420472125U CN 204049822 U CN204049822 U CN 204049822U
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- CN
- China
- Prior art keywords
- hollow nail
- hole
- pad
- nail body
- hollow
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Abstract
The utility model discloses a kind of hollow nail assembly for pole fracture under fixing patella, it comprises latter end and offers threaded hollow nail body, with be sheathed on hollow nail body and the pad freely rotated around the axis of hollow nail body, pad comprises the first ring body offering the first through hole and the second ring body offering the second through hole further, the aperture of the second through hole is less than the aperture of the first through hole, can pass titanium cable in the second through hole; Be provided with axial barrier structure between hollow nail body and pad, pad is axially fixedly installed in hollow nail body under the effect of axial barrier structure.Axial barrier structure is provided with between hollow nail body and pad, and limit sliding axially between hollow nail and pad by this axial barrier structure, pad only freely can rotate around the axis of hollow nail body, and cannot slide axially relative to hollow nail body, thus avoid pad slippage from hollow nail, ensure that the overall structure stability of hollow nail assembly.
Description
Technical field
This utility model relates to technical field of medical instruments, particularly a kind of hollow nail assembly for pole fracture under fixing patella.
Background technology
Under patella, pole fracture betides patella far-end, sclerite is not with or with having articular cartilage face a little, it is type more special in Patella fracture, show as comminuted fracture, sclerite is relatively little more, and this outside lower pole is the starting point of kneecap tendon, stress Relatively centralized, therefore, under the applicable fixing patella of exploitation, the hollow nail assembly of pole fracture, is the key of patellapexy.
Hollow nail can be adopted in prior art as the fixture of pole fracture under patella, this fixed system comprises the hollow nail that external diameter is 3.0mm, the pad being set in hollow nail and titanium cable, wherein, pad can sliding axially along hollow nail, can rotate around the axis of hollow nail simultaneously; Particularly, after under patella, pole sclerite is pulverized, pole sclerite under careful reset, larger sclerite is fixed with 3.0mm hollow nail shimming, titanium cable is by the bone hole through patella near-end after the installing hole on pad, tighten titanium cable, such hollow nail, pad and titanium cable form firmly tension band fixation system, postoperatively namely can start function exercise without extenal fixation.
But the hollow nail in above-mentioned hollow nail assembly and pad have axial freedom, and namely hollow nail may move back nail from patella, fracture fixation stability is reduced, the hollow nail loosened in addition can cause the excitation of skin.
Therefore, the special hollow screw assembly of pole fracture under a kind of fixing patella is provided, it can limit the axial freedom between hollow nail and pad, avoid hollow nail to loosen and move back nail, thus avoid fracture solid failure, ensureing the overall structure stability of hollow nail assembly, needing the problem of solution with regard to becoming those skilled in the art badly.
Utility model content
The purpose of this utility model is to provide a kind of hollow nail assembly for pole fracture under fixing patella, which limit the axial freedom between hollow nail and pad, avoid hollow nail to loosen and move back nail, ensure that the overall structure stability of hollow nail assembly, thus ensure that the success rate of fracture fixation.
For solving the problems of the technologies described above, this utility model provides a kind of hollow nail assembly for pole fracture under fixing patella, comprise latter end and offer threaded hollow nail body, with be sheathed on described hollow nail body and around described hollow nail body axis circumference rotate pad, described pad comprises the first ring body offering the first through hole and the second ring body offering the second through hole, the aperture of described second through hole is less than the aperture of described first through hole, and described second through hole can pass titanium cable; Be provided with axial barrier structure between described hollow nail body and described pad, described pad is axially fixedly installed in described hollow nail body under the effect of described axial barrier structure.
Preferably, described axial barrier structure comprises the nut being arranged at described hollow nail body outer end, with be installed on described hollow nail body and with described nut, there is the fixed block of predetermined axial distance, described first ring body is sheathed on described hollow nail body, and being arranged between described nut and described fixed block, the external diameter of described nut and the external diameter of described fixed block are all greater than the aperture of described first through hole.
Preferably, described locating piece extends one week along the circumference of described hollow nail body.
Preferably, described locating piece is welded in the periphery wall of described hollow nail body.
Preferably, described first ring body and the coplanar setting of described second ring body.
Preferably, the external diameter of described first ring body is 6mm, and hem width is 1.0mm, the aperture 3.35mm of described first through hole.
Preferably, the external diameter of described second ring body is 2.3mm, and the aperture of described second through hole is 1.4mm.
Preferably, the external diameter of the thread segment of described hollow nail body is 3.0mm.
Hollow nail assembly provided by the utility model is for pole fracture under fixing patella, this hollow nail assembly comprises latter end and offers threaded hollow nail body, with be sheathed on described hollow nail body and around described hollow nail body axis circumference rotate pad, described pad comprises the first ring body offering the first through hole and the second ring body offering the second through hole further, the aperture of described second through hole is less than the aperture of described first through hole, and described second through hole can pass titanium cable; Be provided with axial barrier structure between described hollow nail body and described pad, described pad is axially fixedly installed in described hollow nail body under the effect of described axial positioning structure.
Like this, in use, with guide pin by ossiculum block and big bone temporary fixed, and tailing edge guide pin is screwed into hollow nail body and fixes two bone blocks, by second through hole of titanium cable through pad, then tightens titanium cable through behind the bone hole of near-end patella; Owing to being provided with axial barrier structure between hollow nail body and pad, hollow nail body, pad and titanium cable form integral structure, and limit the axial freedom between hollow nail and pad by this axial barrier structure, pad only can rotate around the axis circumference of hollow nail body, and cannot slide axially relative to hollow nail body, thus avoid hollow nail loosen move back nail, and then hollow nail body skids off from fracture when avoiding joint motion, ensure that the overall structure stability of hollow nail assembly, improve the success rate of pole fracture fixation under patella.Use diameter 3.0mm hollow nail to fix pole sclerite under patella, avoid the larger screw of diameter to cause lower pole sclerite to pulverize further, the Novel gasket added adds the area of screw cap, can extrude the fixing more broken little sclerite be connected with kneecap tendon.
In a preferred embodiment, axial barrier structure provided by the utility model comprises the nut being arranged at described hollow nail body outer end, with be installed on described hollow nail body and with described nut, there is the fixed block of predetermined axial distance, described first ring body is sheathed on described hollow nail body, and being arranged between described nut and described fixed block, the external diameter of described nut and the external diameter of described fixed block are all greater than the aperture of described first through hole.Like this, by installing fixed block on hollow nail body, and by fixed block restriction pad sheet version in axial sliding, simplify the course of processing of axial positioning structure, and the structural behaviour of hollow nail body can not be destroyed.
In another preferred embodiment, in hollow nail assembly provided by the utility model, the external diameter of its first ring body is 6mm, and hem width is 1.0mm, the aperture 3.35mm of described first through hole, the external diameter of described second ring body is 2.3mm, and the aperture of described second through hole is 1.4mm.This dimensions can be suitable for pole fracture under fixing patella more, thus improves the suitability of hollow nail assembly.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of detailed description of the invention of hollow nail assembly provided by the utility model;
Fig. 2 is the structural representation of the assembly of hollow nail shown in Fig. 1 Intermediate gasket.
Detailed description of the invention
Core of the present utility model is to provide a kind of hollow nail assembly for pole fracture under fixing patella, which limit the axial freedom between hollow nail and pad, avoid hollow nail to loosen and move back nail, ensure that the overall structure stability of hollow nail assembly, thus ensure that the success rate of fracture fixation.
In order to make those skilled in the art person understand this utility model scheme better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of detailed description of the invention of hollow nail assembly provided by the utility model; Fig. 2 is the structural representation of the assembly of hollow nail shown in Fig. 1 Intermediate gasket.
In a kind of detailed description of the invention, hollow nail assembly provided by the utility model is for pole fracture under fixing patella, this hollow nail assembly comprises latter end and offers threaded hollow nail body 1, with be sheathed on described hollow nail body 1 and around described hollow nail body 1 axis circumference rotate pad 2, described pad 2 comprises the first ring body 21 offering the first through hole 211 and the second ring body 22 offering the second through hole 221 further, the aperture of described second through hole 221 is less than the aperture of described first through hole 211, can pass titanium cable 4 in described second through hole 221; Be provided with axial barrier structure between described hollow nail body 1 and described pad 2, described pad 2 is axially fixedly installed in described hollow nail body 1 under the effect of described axial barrier structure.
With guide pin by ossiculum block and big bone temporary fixed, and tailing edge guide pin is screwed into hollow nail body and fixes two bone blocks, and titanium cable through the second through hole of pad, then tightens titanium cable through behind the bone hole of near-end patella; Owing to being provided with axial barrier structure between hollow nail body and pad, hollow nail body, pad and titanium cable form integral structure, and limit the axial freedom between hollow nail and pad by this axial barrier structure, pad only can rotate around the axis circumference of hollow nail body, and cannot slide axially relative to hollow nail body, thus avoid hollow nail loosen move back nail, and then hollow nail body skids off from fracture when avoiding joint motion, ensure that the overall structure stability of hollow nail assembly, improve the success rate of patella place fixation.
Preferably, axial barrier structure provided by the utility model comprises the nut being arranged at described hollow nail body outer end, with be installed on described hollow nail body and with described nut, there is the fixed block of predetermined axial distance, described first ring body is sheathed on described hollow nail body, and being arranged between described nut and described fixed block, the external diameter of described nut and the external diameter of described fixed block are all greater than the aperture of described first through hole.Like this, by installing fixed block on hollow nail body, and by fixed block restriction pad sheet version in axial sliding, simplify the course of processing of axial barrier structure, and the structural behaviour of hollow nail body can not be destroyed.
Further, in order to improve the reliability that pads placement limits, the axis that locating piece is preferably along hollow nail body extends setting in a week, apparently, and also can at the fixed block of axially uniform some dispersions.
From theory, the function of above-mentioned axial barrier structure is limited the degree of freedom of gasket 2 relative to hollow nail body 1 axis, pad 2 can not be affected relative to hollow nail body 1 rotational freedom in the circumferential simultaneously, therefore, also be not limited to above-mentioned specific embodiment.
Such as, above-mentioned axial barrier structure can be circumferential the first groove being opened in described hollow nail body 1, described first ring body 21 press-fits in described first groove, and the aperture of described first through hole 211 is greater than the groover rot diameter of described first groove, and is less than the external diameter of described hollow nail body 1; This kind of set-up mode structure is comparatively simple, and location is comparatively reliable.
Again such as, above-mentioned axial positioning structure can comprise the second groove that circumference is opened in described first ring body 21 inwall, with the locating piece being arranged at described hollow nail body 1 outer wall, described locating piece is connected in described second groove, and rotates along described second groove circumference.
It is pointed out that owing to realizing grooving processes on hollow nail body comparatively difficult, production cost is higher, and therefore, preferred version is the embodiment being welded and fixed block on hollow nail body.
In order to improve ease of use, above-mentioned first ring body 21 is preferably coplanar setting with described second ring body 22.Apparently, the first ring body 21 also can become suitable angle with the plane at the second ring body 22 place, and this should determine according to actual service condition, in this no limit.
Particularly, the external diameter of above-mentioned first ring body 21 is 6mm, and hem width is 1.0mm, the aperture 3.35mm of described first through hole 211, the external diameter of described second ring body 22 is 2.3mm, and the aperture of described second through hole 221 is 1.4mm, and the external diameter of the thread segment of described hollow nail body 1 is 3.0mm.This dimensions can be suitable for pole fracture under fixing patella more, thus improves the suitability of hollow nail assembly.From theory, above-mentioned each parameter also slightly can be done to change according to actual service condition, is as the criterion not affect use.
It is pointed out that ordinal numbers such as " first, second, third " described in literary composition is the different structure in order to distinguish same names, only for convenience, not representing certain order, more should not be construed as any restriction.
Be described in detail for the hollow nail assembly of pole fracture under fixing patella provided by the utility model above.Apply specific case herein to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from this utility model principle, can also carry out some improvement and modification to this utility model, these improve and modify and also fall in the protection domain of this utility model claim.
Claims (8)
1. the hollow nail assembly for pole fracture under fixing patella, comprise latter end and offer threaded hollow nail body (1), with be sheathed on described hollow nail body (1), and around the pad (2) that the axis of described hollow nail body (1) freely rotates, it is characterized in that, described pad (2) comprises the first ring body (21) offering the first through hole (211) and the second ring body (22) offering the second through hole (221), the aperture of described second through hole (221) is less than the aperture of described first through hole (211), described second through hole (221) can pass titanium cable (4), be provided with axial barrier structure between described hollow nail body (1) and described pad (2), described pad (2) is axially fixedly installed in described hollow nail body (1) under the effect of described axial barrier structure.
2. hollow nail assembly according to claim 1, it is characterized in that, described axial barrier structure comprises the nut (3) being arranged at described hollow nail body outer end, with be installed on described hollow nail body, and with described nut, there is the fixed block (5) of predetermined axial distance, described first ring body (21) is sheathed on described hollow nail body (1), and be arranged between described nut (3) and described fixed block (5), the external diameter of described nut (3) and the external diameter of described fixed block (5) are all greater than the aperture of described first through hole (211).
3. hollow nail assembly according to claim 2, is characterized in that, described stopper (5) extends one week along the circumference of described hollow nail body (1).
4. hollow nail assembly according to claim 3, is characterized in that, described stopper (5) is welded in the periphery wall of described hollow nail body (1).
5. the hollow nail assembly according to any one of Claims 1-4, is characterized in that, described first ring body (21) and the coplanar setting of described second ring body (22).
6. hollow nail assembly according to claim 5, is characterized in that, the external diameter of described first ring body (21) is 6mm, hem width is 1.0mm, the aperture 3.35mm of described first through hole (211).
7. hollow nail assembly according to claim 5, is characterized in that, the external diameter of described second ring body (22) is 2.3mm, and the aperture of described second through hole (221) is 1.4mm.
8. the hollow nail assembly according to any one of Claims 1-4, is characterized in that, the external diameter of the thread segment of described hollow nail body (1) is 3.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420472125.XU CN204049822U (en) | 2014-08-20 | 2014-08-20 | A kind of hollow nail assembly for pole fracture under fixing patella |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420472125.XU CN204049822U (en) | 2014-08-20 | 2014-08-20 | A kind of hollow nail assembly for pole fracture under fixing patella |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204049822U true CN204049822U (en) | 2014-12-31 |
Family
ID=52191431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420472125.XU Expired - Fee Related CN204049822U (en) | 2014-08-20 | 2014-08-20 | A kind of hollow nail assembly for pole fracture under fixing patella |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204049822U (en) |
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2014
- 2014-08-20 CN CN201420472125.XU patent/CN204049822U/en not_active Expired - Fee Related
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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: 20141231 Termination date: 20210820 |