CN209629792U - A kind of spinal internal fixation system pedicle screw - Google Patents
A kind of spinal internal fixation system pedicle screw Download PDFInfo
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- CN209629792U CN209629792U CN201822027312.8U CN201822027312U CN209629792U CN 209629792 U CN209629792 U CN 209629792U CN 201822027312 U CN201822027312 U CN 201822027312U CN 209629792 U CN209629792 U CN 209629792U
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- screw
- internal fixation
- fixation system
- thread segment
- screw body
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Abstract
The utility model discloses a kind of spinal internal fixation system pedicle screws, including screw body；The screw body passes through the cortical bone section of pedicle of vertebral arch, is embedded in and completes to fix in the cancellous bone of backbone；The screw body is hollow structure, and inside is provided with multi-purpose channel along its length；Pilot pin is embedded in the multi-purpose channel, the positioning needle tip stretches out multi-purpose channel；It is implanted into using the stage guidance of embedded pilot pin, significantly improves the positioning accuracy of screw；By the way that side opening is arranged in multi-purpose channel side wall, fills up the gap between screw body and bone uniformly by bone cement, so that the two is formed securely connection, avoid shaking.
Description
Technical field
The utility model relates to a kind of orthopedic medical device more particularly to a kind of spinal internal fixation system pedicle screws.
Background technique
Common spinal operation primary treatment deformation of spinal column, retrogression pathological changes, wound, tumour etc..Spinal operation and interior solid
The fixed history for being applied to clinical existing last 100 years, has made significant headway from material to design.Conventional open surgery, for
The wound of patient is larger, and the old or poor patient of systemic conditions cannot undergo surgery, and the operative rehabilitation time is longer, and is easy to lead
Cause the complication such as postoperative unstable spine, interior fixed loosening, postoperative recurrence.Especially sufferers of osteoporosis face is due to centrum bone density drop
The low fixing intensity that will have a direct impact on pedicle screw causes pedicle screw to loosen, extracts, cutting centrum, interior fixed reset
Failure etc., becomes the potential risk of operation.It is therefore necessary to invent the high internal fixation of spine system of a kind of accurate positioning, fixing intensity
System uses pedicle screw.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the utility model provides a kind of accurate positioning, fixation
The high spinal internal fixation system pedicle screw of intensity.
Technical solution: to achieve the above object, a kind of spinal internal fixation system pedicle screw of the utility model, including
Screw body；The screw body runs through the cortical bone section of pedicle of vertebral arch, is embedded in and completes to fix in the cancellous bone of backbone；The spiral shell
Nail ontology is hollow structure, and inside is provided with multi-purpose channel along its length；It is embedded with pilot pin in the multi-purpose channel, it is described
It positions needle tip and stretches out multi-purpose channel.
Further, the aperture in the multi-purpose channel is 0.5~3mm.
Further, length direction is provided with side opening on the multi-purpose channel side wall；The side opening connection is multi-purpose
Space outside channel interior and screw body.
Further, the side opening is uniformly arranged along the screw thread circumferential direction of screw body, and adjacent side opening and screw body are symmetrical
Angle between axis line is 120 °.
Further, the aperture of the side opening is 0.5~2mm.
Further, the first thread segment and the second thread segment are provided on the outside of the screw body；First thread segment
Internal diameter be greater than the second thread segment, the cortical bone section corresponding matching with pedicle of vertebral arch；Second thread segment and intravertebral pine
Matter bone parts corresponding matching；The internal diameter of first thread segment is greater than the second thread segment.
Further, the length of first thread segment is 10~25mm.
Further, first thread segment uses four head threads；Second thread segment uses double thread；Described
The outer diameter of one thread segment and the second thread segment, lead are identical.
Further, the outer diameter of first thread segment and the second thread segment is 3.5~8mm.
Further, the lead of first thread segment and the second thread segment is 4~8mm.
The utility model has the advantages that a kind of spinal internal fixation system pedicle screw of the utility model, including screw body；The spiral shell
The cortical bone section that ontology runs through pedicle of vertebral arch is followed closely, is embedded in and completes to fix in the cancellous bone of backbone；The screw body is hollow knot
Structure, inside are provided with multi-purpose channel along its length；Pilot pin is embedded in the multi-purpose channel, the positioning needle tip stretches out
Multi-purpose channel；It is implanted into using the stage guidance of embedded pilot pin, significantly improves the positioning accuracy of screw；By more
Side opening is set with channel side wall, fills up the gap between screw body and bone uniformly by bone cement, forms the two secured
Connection, avoids shaking.
Detailed description of the invention
Attached drawing 1 is screw active position schematic diagram；
Attached drawing 2 is bolt structure schematic diagram；
Attached drawing 3 is screw placement operation chart.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.
A kind of spinal internal fixation system pedicle screw, as shown in Fig. 1, including screw body 1；The screw body 1
Run through the cortical bone section of pedicle of vertebral arch 9 from side, be embedded in and complete to fix in the cancellous bone of backbone 8, is as shown in the figure backbone 8 and vertebra
The section of nut 9；Because the structural strength of cortex bone is larger, screw body 1 be partially submerged into from this can guarantee itself with
The bond strength and stability of bone；As shown in Fig. 2, the screw body 1 is hollow structure, and inside is arranged along its length
There is multi-purpose channel 2；As shown in attached drawing 3 (a), pilot pin 3 is embedded in the multi-purpose channel 2,3 tip of pilot pin is stretched out more
With channel 2；When carrying out implant procedure, pilot pin 3 is inserted into multi-purpose channel 2 first, by the piercing of needle point bursting bone
Portion one end distance, then turns screw body 1, is allowed to screw along the direction that pilot pin 3 is pierced into and completes to fix in bone；Then
Pilot pin 3 is inwardly pierced into a distance again, and screw body 1 continues inside precession；The above movement is so repeated, to screw body 1
After being completely embedded into bone, pilot pin 3 is extracted；
Traditional method for implantation is after first piercing out hole in pedicle of vertebral arch 9 and backbone 8 with pilot pin 3, to insert screws into,
Screw easily shifts during precession to be caused to be implanted into path error, causes operative failure；And use embedded positioning
The stage guidance of needle 3 is implanted into, and the above problem would not occur, significantly improve the positioning accuracy of screw.
The aperture in the multi-purpose channel is 0.5~3mm, and the diametric fit with pilot pin 3, the sectional dimension of pilot pin is herein
It can guarantee the intensity of itself in range.
As shown in Fig. 2, length direction is provided with side opening 4 on 2 side wall of multi-purpose channel；The side opening 4 connects
Logical 2 inside of multi-purpose channel and the space outside screw body 1；As shown in attached drawing 3 (b), when screw body 1 is completely embedded into bone
Afterwards and after extraction pilot pin 3, the cooperation of bone cement charging point 7 is inserted into the entrance in multi-purpose channel 2, then in multi-purpose channel 2
Bone cement is filled, these bone cement a part are flowed out from the outlet in multi-purpose channel 2, and another part is as shown by arrows in figure from side opening
4 outflows, so that the gap between screw body 1 and bone be filled up and penetrate into inside cancellous bone the dense area for forming cotton wool
Domain 81 overcomes the problems, such as that cancellous bone structure intensity is insufficient with this, is secured firmly to screw body 1 in the cancellous bone of backbone 8, keeps away
Exempt to loosen shaking；
Existing pedicle screw the case where there is also filling bone cements, but since hollow channel side is not provided with side opening,
Cause bone cement that can only be extruded from channel exit, can not only bone cement be made to be unevenly distributed in this way, but also easily cause office
Portion's bone cement is excessive, it is also necessary to individually clear up excessive part, operate convenience and effect is all not so good as that side opening is arranged
Scheme.
The side opening 4 is uniformly arranged along the screw thread circumferential direction of screw body 1, adjacent side opening 4 and 1 symmetry axis line of screw body
Between angle be 120 °, bone cement can be made to be evenly distributed on the outer circumferential of screw body 1 in this way, guarantee screw body 1
Not filling bone cement stage side be squeezed and there is a situation where position skew deviate.
The aperture of the side opening 4 is 0.5~2mm, and bone cement is easily detected by if aperture is too small, can if aperture is excessive
Cause to pour in excessive bone cement in the side opening of multi-purpose 2 inlet side of channel, cause on 1 length direction of screw body
It is unevenly distributed phenomenon.
The first thread segment 5 and the second thread segment 6 are provided on the outside of the screw body 1；The internal diameter of first thread segment 5
Cortical bone section corresponding matching greater than the second thread segment 6, with pedicle of vertebral arch；Second thread segment 6 and intravertebral cancellous bone
Part corresponding matching；The different zones of screw body 1 are distinguished by the different screw thread in both ends, it on the one hand can be in precession
Screw embedded length is substantially judged in journey, be on the other hand also convenient for it is postoperative by means such as X-rays to screw placement position
It is checked；The internal diameter of first thread segment 5 is greater than the second thread segment 6, because screw and the binding site of cortex bone are to hold
The region of frangibility, it is such design not only increased cortical bone section screw body intensity, but also can ensure that screw body with
Cancellous bone portion has enough holding powers, to guarantee the intensity of screw.
The length of first thread segment 5 is 10~25mm, if the length of the first thread segment 5 is too small, screw and cortex
The bond area of bone is too small and close to bone surface, cannot meet the requirements in conjunction with length is lower；If the length of the first thread segment 5
Excessive, then the binding site of screw and pedicle of vertebral arch is by inner, because of the finite thickness of cortex bone, it is real to will lead to part screw at this time
The cancellous bone portion of pedicle of vertebral arch is had passed through on border, then the part be easy to cause screw loosening.
First thread segment 5 uses four head threads；Second thread segment 6 uses double thread；First screw thread
Section 5 is identical with the outer diameter of the second thread segment 6, lead, the precession of screw can be made to act more smooth, raising using multiple thread
Implantation efficiency.
The outer diameter of first thread segment 5 and the second thread segment 6 is 3.5~8mm, if major diameter of thread is too small, the screw
Inside is just difficult to reserve sufficient space to process multi-purpose channel 2；And because the thickness of cortex of bone of pedicle of vertebral arch is certain, if major diameter of thread
It is excessive, then it is difficult to the first thread segment 5 and is passed through completely from cortical bone section；When major diameter of thread takes 3.5~8mm, screw
Structural strength is moderate, and the first thread segment 5 can also pass through cortical bone section from pedicle of vertebral arch in the outer part and continue deeper into.
The lead of first thread segment 5 and the second thread segment 6 is 4~8mm, at this time the speed and dynamics when precession screw
It is moderate.
The above is only the preferred embodiment of the utility model, it should be pointed out that: for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (10)
1. a kind of spinal internal fixation system pedicle screw, it is characterised in that: including screw body (1)；The screw body (1)
Through the cortical bone section of pedicle of vertebral arch, it is embedded in and completes to fix in the cancellous bone of backbone；The screw body (1) is hollow structure,
Inside is provided with multi-purpose channel (2) along its length；Pilot pin (3), the pilot pin are embedded in the multi-purpose channel (2)
(3) multi-purpose channel (2) are stretched out at tip.
2. a kind of spinal internal fixation system pedicle screw according to claim 1, it is characterised in that: the multi-purpose channel
(2) aperture is 0.5~3mm.
3. a kind of spinal internal fixation system pedicle screw according to claim 1, it is characterised in that: the multi-purpose channel
(2) length direction is provided with side opening (4) on side wall；The side opening (4) is connected to multi-purpose channel (2) inside and screw body
(1) external space.
4. a kind of spinal internal fixation system pedicle screw according to claim 3, it is characterised in that: the side opening (4)
Screw thread circumferential direction along screw body (1) is uniformly arranged, the angle between adjacent side opening (4) and screw body (1) symmetry axis line
It is 120 °.
5. a kind of spinal internal fixation system pedicle screw according to claim 3, it is characterised in that: the side opening (4)
Aperture be 0.5~2mm.
6. a kind of spinal internal fixation system pedicle screw according to claim 1, it is characterised in that: the screw body
(1) outside is provided with the first thread segment (5) and the second thread segment (6)；The internal diameter of first thread segment (5) is greater than the second screw thread
Section (6), the cortical bone section corresponding matching with pedicle of vertebral arch；Second thread segment (6) is corresponding with intravertebral cancellous bone portion
Cooperation.
7. a kind of spinal internal fixation system pedicle screw according to claim 6, it is characterised in that: first screw thread
The length of section (5) is 10~25mm.
8. a kind of spinal internal fixation system pedicle screw according to claim 6, it is characterised in that: first screw thread
Section (5) uses four head threads；Second thread segment (6) uses double thread；First thread segment (5) and the second thread segment
(6) outer diameter, lead are identical.
9. a kind of spinal internal fixation system pedicle screw according to claim 8, it is characterised in that: first screw thread
The outer diameter of section (5) and the second thread segment (6) is 3.5~8mm.
10. a kind of spinal internal fixation system pedicle screw according to claim 8, it is characterised in that: first spiral shell
Line section (5) and the lead of the second thread segment (6) are 4~8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822027312.8U CN209629792U (en) | 2018-12-05 | 2018-12-05 | A kind of spinal internal fixation system pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822027312.8U CN209629792U (en) | 2018-12-05 | 2018-12-05 | A kind of spinal internal fixation system pedicle screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209629792U true CN209629792U (en) | 2019-11-15 |
Family
ID=68473349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822027312.8U Expired - Fee Related CN209629792U (en) | 2018-12-05 | 2018-12-05 | A kind of spinal internal fixation system pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209629792U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112426218A (en) * | 2020-11-23 | 2021-03-02 | 常州集硕医疗器械有限公司 | Bone cement fixation device and method |
-
2018
- 2018-12-05 CN CN201822027312.8U patent/CN209629792U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112426218A (en) * | 2020-11-23 | 2021-03-02 | 常州集硕医疗器械有限公司 | Bone cement fixation device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20191115 Termination date: 20211205 |