CN208640864U - A kind of self-locking anti-rotation pedicle screw - Google Patents
A kind of self-locking anti-rotation pedicle screw Download PDFInfo
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- CN208640864U CN208640864U CN201820609033.XU CN201820609033U CN208640864U CN 208640864 U CN208640864 U CN 208640864U CN 201820609033 U CN201820609033 U CN 201820609033U CN 208640864 U CN208640864 U CN 208640864U
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Abstract
The utility model belongs to technical field of medical equipment, more particularly to a kind of self-locking anti-rotation pedicle screw, including integrally formed screw tail portion and screw body, screw tail portion top offers U-lag, screw tail portion upper surface offers the first blind hole, first blind hole inner wall is equipped with the first internal screw thread, screw body outer wall is equipped with the first external screw thread, screw body is equipped with the second blind hole in the first blind via bottom, middle bar is equipped in second blind hole, middle bar is threadedly coupled with screw body, middle bar lower end is in up big and down small pyramidal structure, screw body lower part radial symmetric is set there are two notch, the height dimension of inner side is greater than the height dimension on the outside of notch, bail is equipped in notch, expose screw body outer wall in bail outer end, second boss is equipped on the inside of bail upper surface.It, which has, dramatically increases the fixed stability of pedicle screw, improves pedicle screw axial direction resisting pull out forces, and screw is not easy to loosen and exit, the low advantage of broken nail, disconnected stick incidence.
Description
Technical field
The utility model belongs to technical field of medical equipment, and in particular to a kind of self-locking anti-rotation pedicle screw.
Background technique
Osteoporosis (osteoporosis, OP) be a kind of low, bone micro-structure with bone amount destroys, bone brittleness increases,
Systemic, metabolic bone systemic disease that fracture is characterized easily occur for bone strength decline.The female in U.S. in 2004 50 years old or more
Property, male's OP illness rate be 13%-18%, 3%-6%, women, the illness rate of male in 50 years old or more, Europe in 2010 are
21%, 6%.The end of the year 2014, the total prevalence rate women of China 50 years old or more OP are 20.7%, and male 14.4%.50 years old or more
Low BMD crowd male 57.6%, women 64.6%.OP feature: 1. risk of bone fracture obviously increases, 2. interior fixed easily loosening, abjection
Or broken nail breaks stick, 3. healing time is long or disunion, and 4. bone grafting easily absorbs, and 5. activity reduces, accelerates bone resorption, aggravates
OP, 6. resets difficulty after fracture site, second fracture risk is big.Document report OP Unstable internal fixation rate is up to 18% -63%.
The Osteoporotic vertebral fracture conservative therapy death rate increases by 23%, and surgical intervention: 1. plain screw is fixed: increasing
Pedicle screw diameter, length and increase fixed-segment, wound is big, and operation risk increases, and screw loosening exits, broken nail, disconnected stick
Incidence obviously increases；2. convex after percutaneous vertbroplasty (percutaneousvertebroplasty.PVP) and percutaneous vertebral body
Plasty (percutaneouskyphoplasty, PKP) is widely used in treating Treatment of osteoporotic vertebral compression fractures, minimally invasive, town
Pain definite effect, but fracture loses healing chance, is suitable for elderly patient；3. bone cement pedicle screw can obtain at once
Stabilization, is still influence union chance and operating time is obviously prolonged；4. expanding pedicle screw, cannot obtain at once steady
It is fixed, and anti-soon resistance to plucking output capacity is low.Design the pedicle screw of the centrum of the novel fixed osteoporosis of one kind or bone amount reduction
It is imperative.
Utility model content
The purpose of this utility model is: being intended to provide a kind of self-locking anti-rotation pedicle screw, it, which has, dramatically increases vertebral arch
The fixed stability of root screw, improves pedicle screw axial direction resisting pull out forces.Screw is not easy to loosen and exit, and broken nail incidence is low
Advantage.
To realize the above-mentioned technical purpose, the technical solution adopted in the utility model is as follows:
A kind of self-locking anti-rotation pedicle screw, including integrally formed screw tail portion and screw body, the screw tail portion
Top offers U-lag, and screw tail portion upper surface offers the first blind hole, and the first blind hole inner wall is equipped with spiral shell in first
Line, the screw body outer wall are equipped with the first external screw thread, and the screw body is equipped with the second blind hole in the first blind via bottom, described
Middle bar is equipped in second blind hole, the middle bar is threadedly coupled with screw body, and the middle bar lower end is in up big and down small taper knot
Structure, screw body lower part radial symmetric are set there are two notch, and the height dimension of the inner side is greater than on the outside of notch
Height dimension, is equipped with bail in the notch, and screw body outer wall is exposed in the bail outer end, on the inside of the bail upper surface
Equipped with second boss.
It further limits, the screw body is equipped with annular groove in the second blind hole top edge, in the annular groove
Wall is equipped with the second internal screw thread, and the middle bar upper surface is equipped with the first boss that matches with annular groove, outside the first boss
Wall is equipped with the second external screw thread to match with the second internal screw thread, and the first boss upper surface is equipped with hexagonal blind hole in first.This
The structure of sample designs, and first boss is mounted in annular groove, and bar is threadedly coupled with screw body in completion, is fixed to each other
On the basis of, first boss is sunk in annular groove, the use for influencing the first internal screw thread of the first blind hole inner wall is avoided.
It further limits, the second boss upper surface by tilting gradually downward inwardly outside.The design of such structure makes the
Two boss and the pyramidal structure of middle bar lower end match, and middle bar end is caught in more easily between two bails,
It is more convenient to use.
It further limits, the bail inner face is arc-shaped.Such structure design, so that forming one between two bails
A gap, middle bar end can be more easily inserted between two bails.
It further limits, the pedicle screw further includes putting rod, and the putting rod upper end is equipped with handle, the storing
Bar lower end is equipped with threaded post, and the second boss upper surface is equipped with the threaded hole to match with threaded post vertically.Such structure
Design closes connection bail by the threaded post and corresponding threaded holes of putting rod, then bail is put by putting rod when in use
In notch, putting rod is then reversely rotated, takes out putting rod, then place another bail, it is more convenient to use.
It further limits, the pedicle screw further includes that card sets bar, and the card sets bar upper surface and is equipped with and annular groove
The third boss to match, the third outer wall of boss are equipped with the third external screw thread to match with the second internal screw thread, the third
Boss upper surface is equipped with hexagonal blind hole in third, and the card sets bar lower end surface equipped with longitudinal section in up-narrow and down-wide trapezium structure
Circular groove.After bail is put into notch by putting rod, then card being placed in screw body and sets bar, bar is set by card
Circular groove blocks the second boss of bail, and screw body is then implanted into bone, and after the completion of implantation, card of dismantling sets bar, installation
Middle bar；Such structure design, can avoid screw body in implantation process, and screw body is protruded in bail outer end, makes to bone
At injury.
It further limits, the second boss lateral surface is the arc that matches with circular groove.Such structure design, the
The lateral surface of two boss and the inner wall of circular groove match, and set in bar rotation process in card, second boss and card are set between bar
Contact be face contact, the water chestnut that can avoid second boss sets bar to card and causes to damage, and practicability is stronger.
It further limits, first external screw thread is double thread.The design of such structure, can not only obtain faster into
Speed is followed closely, and relative to single thread, there are better resisting pull out forces, screw loosening can be avoided to a certain extent and pull out
The complication such as out.
The invention also discloses the application methods of above-mentioned self-locking anti-rotation pedicle screw, include the following steps:
S1. it assembles bail: bail is installed on putting rod, then the putting rod for installing bail is put into screw body,
Operation putting rod makes bail pass through notch, and bail end is located on the outside of screw body, then takes out putting rod, repeats above-mentioned step
Suddenly, another bail is installed on to the gap position of screw body；At this point, bail outer end is stopped by notch, reversely rotates and put
Bar can make threaded post be detached from threaded hole, easy to use；
S2. installation card sets bar: two bails of pressing are hidden in screw body to bail end, then in screw master
Internal installation card sets bar；The sum of the length dimension of two bails is slightly less than the outer diameter of screw body, installs when card sets bar
Cheng Hou, bail outer end are unlikely to protrude outside screw body, can avoid bail in screw body implantation process, to skeleton
It causes to scratch；
S3. it is implanted into bone: being implanted into skeleton with the screw body for setting bar is blocked bail is mounted with；At this time outside two bails
End is kept off by bone, so that bail is unlikely to fall；
S4. reinforce fixing: using tool clamp screws tail portion, then reversely rotate card and set bar, so that card is set bar and be detached from screw
Main body continues to use tool clamp screws tail portion, then in screw body installation in bar, middle bar during moving down,
It pushes bail to move horizontally to two sides, so that bail be made to be caught in skeleton, is exited so that screw body is not easy to loosen.
Utility model by adopting the above technical scheme, screw body are hollow structure, and bar in installation, makes in screw body
Middle bar and screw body bear radial shear power together, and the structural strength of screw body can be improved, and prevent broken nail, disconnected stick feelings
The generation of condition；The bail extended to two sides is set in screw body lower end, and with the movement of middle bar, bail is moved to two sides level
It is dynamic, it is caught in skeleton, increases the fixed stability of pedicle screw, improves pedicle screw axial direction resisting pull out forces, screw is not
It easily loosens and exits, and bone will not be damaged elsewhere.
Detailed description of the invention
The utility model can be further illustrated by the nonlimiting examples that attached drawing provides；
Fig. 1 is a kind of structural schematic diagram of self-locking anti-rotation pedicle screw embodiment of the utility model；
Fig. 2 is a kind of schematic cross-sectional view of self-locking anti-rotation pedicle screw embodiment of the utility model；
Fig. 3 is the enlarged structure schematic diagram in Fig. 2 at A；
Fig. 4 is the sectional structure signal of screw body in a kind of self-locking anti-rotation pedicle screw embodiment of the utility model
Figure；
Fig. 5 is the enlarged structure schematic diagram in Fig. 4 at B；
Fig. 6 is the structural schematic diagram of bail in a kind of self-locking anti-rotation pedicle screw embodiment of the utility model；
Fig. 7 is the structural representation of putting rod and bail in a kind of self-locking anti-rotation pedicle screw embodiment of the utility model
Figure；
Fig. 8 is the structural schematic diagram that card sets bar in a kind of self-locking anti-rotation pedicle screw embodiment of the utility model；
Fig. 9 is the structural representation that card sets when bar uses in a kind of self-locking anti-rotation pedicle screw embodiment of the utility model
Figure；
Figure 10 is the enlarged structure schematic diagram in Fig. 9 at C；
Main element symbol description is as follows:
Screw tail portion 1, the first blind hole 11, screw body 2, annular groove 21, the second blind hole 22, middle bar 3, first boss
31, hexagonal blind hole 32 in first, notch 4, bail 5, second boss 51, putting rod 6, handle 61, threaded post 62, threaded hole 620,
Card sets bar 7, third boss 71, hexagonal blind hole 72, circular groove 73 in third.
Specific embodiment
It is right with reference to the accompanying drawings and examples in order to make those skilled in the art that the utility model may be better understood
Technical solutions of the utility model further illustrate.
As shown in Fig. 1~Figure 10, the self-locking anti-rotation pedicle screw of one kind of the utility model, including integrally formed screw
Tail portion 1 and screw body 2,1 top of screw tail portion offer U-lag, and 1 upper surface of screw tail portion offers the first blind hole 11, the
One blind hole, 11 inner wall is equipped with the first internal screw thread, and 2 outer wall of screw body is equipped with the first external screw thread, and screw body 2 is in the first blind hole 11
Bottom is equipped with the second blind hole 22, is equipped with middle bar 3 in the second blind hole 22, middle bar 3 is threadedly coupled with screw body 2, middle 3 lower end of bar
In up big and down small pyramidal structure, 2 lower part radial symmetric of screw body is set there are two notch 4, and the height dimension of 4 inside of notch is big
Height dimension in the outside of notch 4 is equipped with bail 5 in notch 4, and 2 outer wall of screw body, 5 upper end of bail are exposed in 5 outer end of bail
Second boss 51 is equipped on the inside of face.
Wherein, screw body 2 is equipped with annular groove 21 in 22 top edge of the second blind hole, and 21 inner wall of annular groove is equipped with the
Two internal screw threads, middle 3 upper surface of bar are equipped with the first boss 31 that matches with annular groove 21, and 31 outer wall of first boss is equipped with and the
The second external screw thread that two internal screw threads match, 31 upper surface of first boss are equipped with hexagonal blind hole 32 in first.Such structure is set
Meter, first boss 31 are mounted in annular groove 21, and bar 3 is threadedly coupled with screw body 2 in completion, the basis being fixed to each other
On, first boss 31 is sunk in annular groove 21, the use for influencing the first internal screw thread of 11 inner wall of the first blind hole is avoided.
51 upper surface of second boss by tilting gradually downward inwardly outside.Such structure design, makes second boss 51 in
The pyramidal structure of 3 lower end of bar matches, and middle 3 end of bar is caught in more easily between two bails 5, using more
Add conveniently.
5 inner face of bail is arc-shaped.Such structure design, so that forming a gap, middle bar 3 between two bails 5
End can be more easily inserted between two bails 5.
Pedicle screw further includes putting rod 6, and 6 upper end of putting rod is equipped with handle 61, and 6 lower end of putting rod is equipped with threaded post
62,51 upper surface of second boss is equipped with the threaded hole 620 to match with threaded post 62 vertically.Such structure design, is using
When, by the threaded post 62 of putting rod 6 and the bail 5 in mating connection of threaded hole 620, then by putting rod 6 bail 5 is put into scarce
In mouth 4, putting rod 6 is then reversely rotated, takes out putting rod 6, then place another bail, it is more convenient to use.
Pedicle screw further includes that card sets bar 7, and card sets 7 upper surface of bar and is equipped with the third boss to match with annular groove 21
71,71 outer wall of third boss is equipped with the third external screw thread to match with the second internal screw thread, and 71 upper surface of third boss is equipped with third
Interior hexagonal blind hole 72, card set circular groove 73 of 7 lower end surface of bar equipped with longitudinal section in up-narrow and down-wide trapezium structure.By setting
It puts after bar 6 is put into bail 5 in notch 4, then places card in screw body 2 and set bar 7, the circular groove 73 of bar 7 is set by card
The second boss 51 of bail 5 is blocked, screw body 2 is then implanted into bone, after the completion of implantation, card of dismantling sets bar 7, bar in installation
3；Such structure design, can avoid screw body 2 in implantation process, and screw body 2 is protruded in 5 outer end of bail, makes to bone
At injury.
51 lateral surface of second boss is the arc that matches with circular groove 73.Such structure design, second boss 51
The inner wall of lateral surface and circular groove 73 matches, and sets in 7 rotation process of bar in card, and second boss 51 and card are set between bar 7
Contact is face contact, and the water chestnut that can avoid second boss 51 sets bar 7 to card and causes to damage, and practicability is stronger.
First external screw thread is double thread.Such structure design, can not only obtain faster into nail speed, and relatively
In single thread, there are better resisting pull out forces, the complication such as screw loosening and extraction can be avoided to a certain extent.
The invention also discloses the application methods of above-mentioned self-locking anti-rotation pedicle screw, include the following steps:
S1. it assembles bail: bail 5 is installed on putting rod 6, the putting rod 6 for installing bail 5 is then put into screw body
In 2, operation putting rod 6 makes bail 5 pass through notch 4, and 5 end of bail is located at 2 outside of screw body, then takes out putting rod
6, it repeats the above steps, another bail 6 is installed on to 4 position of notch of screw body 2；At this point, 5 outer end of bail is by notch 4
Stop, reversely rotate putting rod 6, threaded post 62 can be made to be detached from threaded hole 620, it is easy to use；
S2. installation card sets bar: two bails 5 of pressing are hidden in screw body 2 to 5 end of bail, then in spiral shell
Installation card sets bar 7 in nail main body 2；The sum of the length dimension of two bails 5 is slightly less than the outer diameter of screw body 2, when card is set
After bar 7 is installed, 5 outer end of bail is unlikely to protrude outside screw body 2, can avoid bail 5 in 2 implantation process of screw body
In, skeleton is caused to scratch；
S3. it is implanted into bone: being implanted into skeleton with the screw body 2 for setting bar 7 is blocked bail 5 is mounted with；Two cards at this time
Nail outer end is kept off by bone, so that bail 5 is unlikely to fall；
S4. reinforce fixing: using tool clamp screws tail portion 1, then reversely rotate card and set bar 7, so that card is set bar 7 and be detached from spiral shell
Follow closely main body 2, continue to use tool clamp screws tail portion 1, then in screw body 2 installation in bar 3；Middle bar 3 is moving down
In the process, bail 5 is pushed to move horizontally to two sides, to make bail 5 be caught in skeleton, so that screw body 2 is not easy to loosen
It exits.
In the present embodiment, screw body 2 is hollow structure, and bar 3 in installation, makes middle bar 3 and screw master in screw body 2
The occurrence of body 2 bears radial shear power together, and the structural strength of screw body 2 can be improved, and prevents broken nail, disconnected stick；
The bail 5 extended to two sides is set in 2 lower end of screw body, and with the movement of middle bar 3, bail 5 is moved horizontally to two sides, is caught in
Skeleton increases the fixed stability of pedicle screw, improves pedicle screw axial direction resisting pull out forces, and screw is not easy to loosen and move back
Out, and bone will not be damaged elsewhere.
Anti- rotation pedicle screw self-locking to one kind provided by the utility model is described in detail above.Specific embodiment
Explanation be merely used to help understand the method and its core concept of the utility model.It should be pointed out that for the art
For those of ordinary skill, without departing from the principle of this utility model, several change can also be carried out to the utility model
Into and modification, modifications and modifications also fall within the protection scope of the claims of the utility model.
Claims (8)
1. a kind of self-locking anti-rotation pedicle screw, including integrally formed screw tail portion (1) and screw body (2), the screw
Tail portion (1) top offers U-lag, and screw tail portion (1) upper surface offers the first blind hole (11), first blind hole
(11) inner wall is equipped with the first internal screw thread, and screw body (2) outer wall is equipped with the first external screw thread, and the screw body (2) is in the
One blind hole (11) bottom is equipped with the second blind hole (22), it is characterised in that: middle bar (3) are equipped in second blind hole (22), it is described
Middle bar (3) is threadedly coupled with screw body (2), and middle bar (3) lower end is in up big and down small pyramidal structure, the screw body
(2) lower part radial symmetric is set there are two notch (4), and the height dimension on the inside of the notch (4) is greater than the height on the outside of notch (4)
Size, the notch (4) is interior to be equipped with bail (5), and screw body (2) outer wall, the bail are exposed in bail (5) outer end
(5) second boss (51) are equipped on the inside of upper surface.
2. the self-locking anti-rotation pedicle screw of one kind according to claim 1, it is characterised in that: the screw body (2) in
Second blind hole (22) top edge is equipped with annular groove (21), and annular groove (21) inner wall is equipped with the second internal screw thread, described
Middle bar (3) upper surface is equipped with the first boss (31) to match with annular groove (21), and first boss (31) outer wall is equipped with
The second external screw thread to match with the second internal screw thread, first boss (31) upper surface are equipped with hexagonal blind hole (32) in first.
3. the self-locking anti-rotation pedicle screw of one kind according to claim 2, it is characterised in that: on the second boss (51)
End face by tilting gradually downward inwardly outside.
4. the self-locking anti-rotation pedicle screw of one kind according to claim 3, it is characterised in that: bail (5) inner face
It is arc-shaped.
5. the self-locking anti-rotation pedicle screw of one kind according to claim 4, it is characterised in that: the pedicle screw also wraps
It includes putting rod (6), putting rod (6) upper end is equipped with handle (61), and putting rod (6) lower end is equipped with threaded post (62), institute
It states second boss (51) upper surface and is equipped with the threaded hole (620) to match with threaded post (62) vertically.
6. the self-locking anti-rotation pedicle screw of one kind according to claim 5, it is characterised in that: the pedicle screw also wraps
Card is included to set bar (7), the card sets bar (7) upper surface and is equipped with the third boss (71) that matches with annular groove (21), and described the
Three boss (71) outer wall is equipped with the third external screw thread that matches with the second internal screw thread, and third boss (71) upper surface is equipped with the
Hexagonal blind hole (72) in three, the card set circular groove of bar (7) lower end surface equipped with longitudinal section in up-narrow and down-wide trapezium structure
(73)。
7. the self-locking anti-rotation pedicle screw of one kind according to claim 6, it is characterised in that: the second boss (51) is outside
Side is the arc that matches with circular groove (73).
8. the self-locking anti-rotation pedicle screw of one kind according to claim 7, it is characterised in that: first external screw thread is double
Screw thread.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820609033.XU CN208640864U (en) | 2018-04-26 | 2018-04-26 | A kind of self-locking anti-rotation pedicle screw |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820609033.XU CN208640864U (en) | 2018-04-26 | 2018-04-26 | A kind of self-locking anti-rotation pedicle screw |
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| CN208640864U true CN208640864U (en) | 2019-03-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108498155A (en) * | 2018-04-26 | 2018-09-07 | 重庆医科大学附属永川医院 | A kind of anti-rotation pedicle screw of self-locking and its application method |
-
2018
- 2018-04-26 CN CN201820609033.XU patent/CN208640864U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108498155A (en) * | 2018-04-26 | 2018-09-07 | 重庆医科大学附属永川医院 | A kind of anti-rotation pedicle screw of self-locking and its application method |
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