CN201847766U - Hollow anti-slip screw for patellar fracture internal fixation - Google Patents
Hollow anti-slip screw for patellar fracture internal fixation Download PDFInfo
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- CN201847766U CN201847766U CN2010206074256U CN201020607425U CN201847766U CN 201847766 U CN201847766 U CN 201847766U CN 2010206074256 U CN2010206074256 U CN 2010206074256U CN 201020607425 U CN201020607425 U CN 201020607425U CN 201847766 U CN201847766 U CN 201847766U
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- screw
- internal fixation
- nail
- fracture internal
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Abstract
The utility model discloses a hollow anti-slip screw for patellar fracture internal fixation, which comprises a screw cap, a screw body and a screw point, wherein a vertical cavity is formed along an axial lead of the screw. The utility model is characterized in that the screw body is provided with near side screw threads and far side screw threads, and the smooth screw body is arranged between the near side screw threads and the far side screw threads. Compared with the prior art, the utility model has the advantages that the hollow anti-slip screw has stronger pressure resistance, bending resistance and rotation resistance capability, the occurrence of phenomena of screw unscrewing and looseness can be effectively prevented, and the fracture fixation is firm.
Description
[technical field]
This utility model relates to a kind of medical apparatus and instruments that is used for orthopaedics, particularly a kind of hollow screw that is applicable to Patella fracture.
[background technology]
Patella is the sesamoid bone of whole body maximum, the treatment Patella fracture basic goal for keeping patella as much as possible, recover its anatomy relationship, the maintenance broken ends of fractured bone reset and to tensile stress to keep its original function.For patella transverse fracture that displacement is arranged or patella complicated fracture, for early stage knee joint activity, to prevent that the postoperative stiff knee from reducing disability rate, require internal fixation must have enough intensity to stretch bending force and the distraction force that produces in the activity of bending to resist in early days the postoperative knee joint.Internal fixation method commonly used has ring to prick fixation, run through fixation, tension band fixation, wherein Kirschner wire tension band wire internal fixation and steel wire circular ligate art, clinical efficacy certainly, but this kind method is through remaining after the long-term clinical application in following shortcoming: 1. the Kirschner wire end need be bent into the crotch greater than 90 ° in the former art, careless slightly meeting causes that Kirschner wire or steel wire become flexible, displacement fracture loses the meaning of Kirschner wire balteum steel wire internal fixation; 2. crooked minute hand end excessively rotates forward, can cause the local skin tenderness even poke skin, causes infection; 3. Kirschner wire smooth surface, knee joint cause easily when often movable that needle body is loosening, rotate or deviate from, and cause the balteum steel wire to come off, and internal fixation lost efficacy; 4. the latter must be aided with the external fixation about 6 weeks, and postoperative can not carry out functional exercise in early days, even it is good to reset, the curative effect acceptance rate also is difficult to improve.To fracture that displacement is arranged comminuted fracture particularly, this type of reduction of the fracture and fixing certain difficulty arranged all.In recent years, use hollow screw that Patella fracture is carried out internal fixation and is accepted by clinical gradually, still do not see the hollow screw that is exclusively used in patella in the market as yet, and present hollow screw is when being applied to the Patella fracture internal fixation, easily produce and slide, fastness is poor.
[summary of the invention]
Technical assignment of the present utility model is at above the deficiencies in the prior art, provides a kind of to the Patella fracture fixation, and tissue injury is little, bio-compatible good, the new fixation device fast to union of fracture; Farthest reduce surgical injury, help the treatment and the recovery of conditions of patients the patient.
The technical scheme in the invention for solving the technical problem is: a kind of Patella fracture internal fixation is prevented the slip hollow screw, comprise the head of a nail, nail body, nail point, along its axial line vertical cavity is arranged, it is characterized in that: described nail body is provided with proximal thread and distally screw thread, is slick nail body between proximal thread and the distally screw thread.
The above-mentioned head of a nail is the countersunk raised head shape.
Above-mentioned nail body diameter is 5.0mm.
Above-mentioned proximal thread is the cortical bone screw thread, and the distally screw thread is a cancellous threads.
Compared with prior art, the utlity model has following outstanding beneficial effect:
1, have stronger resistance to compression, bending resistance, anti-rotation performance, fracture fixation is firm;
2, the head of a nail is the countersunk raised head shape, the effect of have pressurization, sliding;
3, have near-end cortical bone screw thread, can be firmly fixed in the sclerotin, prevent withdrawing from and the generation of loosening phenomenon of screw;
4, nail body diameter 5.0mm, the thickness and the length of cooperation patella meet the biomechanics requirement.
[description of drawings]
Fig. 1 is a cross-sectional schematic of the present utility model.
[specific embodiment]
Below in conjunction with specification drawings and specific embodiments this utility model is further specified.
As shown in Figure 1, this utility model comprises the head of a nail 1, nail body 2, nail point 3, along its axial line vertical cavity 4 is arranged.
The described head of a nail 1 is the countersunk raised head shape.
Described nail body 2 diameters are 5.0mm, are provided with proximal thread 5 and distally screw thread 6, are slick nail body between proximal thread 5 and the distally screw thread 6.Proximal thread 5 is the cortical bone screw thread, and distally screw thread 6 is a cancellous threads.
The parameter specification of this utility model screw length and screw thread is:
Screw length: 75mm～110mm, every 5mm are a specification;
Distally screw thread 6 length: 18mm, distally screw thread 6 pitch: 2.75mm, diameter are 6.5mm.
Need to prove; particular of the present utility model is described in detail this utility model; for a person skilled in the art, in the various conspicuous change of under the situation that does not deviate from spirit and scope of the present utility model it being carried out all within protection domain of the present utility model.
Claims (4)
1. the anti-slip hollow screw of Patella fracture internal fixation comprises the head of a nail, nail body, nail point, along its axial line vertical cavity is arranged, and it is characterized in that: described nail body is provided with proximal thread and distally screw thread, is slick nail body between proximal thread and the distally screw thread.
2. Patella fracture internal fixation according to claim 1 is prevented the slip hollow screw, it is characterized in that the described head of a nail is the countersunk raised head shape.
3. Patella fracture internal fixation according to claim 1 is prevented the slip hollow screw, it is characterized in that described nail body diameter is 5.0mm.
4. Patella fracture internal fixation according to claim 1 is prevented the slip hollow screw, it is characterized in that described proximal thread is the cortical bone screw thread, and the distally screw thread is a cancellous threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206074256U CN201847766U (en) | 2010-11-05 | 2010-11-05 | Hollow anti-slip screw for patellar fracture internal fixation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206074256U CN201847766U (en) | 2010-11-05 | 2010-11-05 | Hollow anti-slip screw for patellar fracture internal fixation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201847766U true CN201847766U (en) | 2011-06-01 |
Family
ID=44090185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206074256U Expired - Fee Related CN201847766U (en) | 2010-11-05 | 2010-11-05 | Hollow anti-slip screw for patellar fracture internal fixation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201847766U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106999219A (en) * | 2014-12-15 | 2017-08-01 | 史密夫和内修有限公司 | Active fractures pressurized implant |
| CN107157565A (en) * | 2017-05-12 | 2017-09-15 | 上海市普陀区利群医院 | A kind of steel plate of tension band for patellar fracture |
-
2010
- 2010-11-05 CN CN2010206074256U patent/CN201847766U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106999219A (en) * | 2014-12-15 | 2017-08-01 | 史密夫和内修有限公司 | Active fractures pressurized implant |
| CN107157565A (en) * | 2017-05-12 | 2017-09-15 | 上海市普陀区利群医院 | A kind of steel plate of tension band for patellar fracture |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110601 Termination date: 20111105 |