CN206659901U - A kind of self-locking pedicle screw - Google Patents
A kind of self-locking pedicle screw Download PDFInfo
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- CN206659901U CN206659901U CN201621437466.9U CN201621437466U CN206659901U CN 206659901 U CN206659901 U CN 206659901U CN 201621437466 U CN201621437466 U CN 201621437466U CN 206659901 U CN206659901 U CN 206659901U
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Abstract
The technical field of medicine equipment is the utility model is related to, particularly a kind of pedicle nail.A kind of self-locking pedicle screw, including：Nail rod and nail tail, nail rod is fixedly connected with nail tail, tail is remote is provided with internal thread with one end of nail rod junction for nail, internal thread is thin-walled tomography screw thread, internal thread is formed by region of circling round around central shaft spiral, convolution region is sequentially connected with the section through internal thread central axis in multiple convolution units, and convolution unit includes：The first line segment, second line segment and the 3rd line segment being sequentially connected with, the angle between second line segment and the 3rd line segment are 85 °~95 °.The problem of a kind of self-locking pedicle screw solves thin-walled screw thread or is deformed or expands when Serial section Screw assembly holds out against plug screw, destroys accuracy of thread grade, loses screw thread kinetic energy, and stress fails.
Description
Technical field
Technical field of medical instruments is the utility model is related to, particularly a kind of pedicle screw.
Background technology
As shown in figure 3, normal pressures of the wherein F between external screw thread and internal thread, f rub between external screw thread and internal thread
Power, E are axial force, and f, F are overlapped mutually in the component of E vertical direction, and torque is 12NM in screw thread, as screw thread screws depth
Enter, f, F are increasing in the component that E vertical direction is overlapped mutually, the strong coefficient in the wrong until reaching screw thread, thin-walled screw thread or tomography
Screw cutting is deformed or expanded, and destroys accuracy of thread grade, loses screw thread kinetic energy, stress failure.
Utility model content
The technical problems to be solved in the utility model is：Thin-walled screw thread or Serial section Screw assembly produce when holding out against plug screw
Deformation or expansion, destroy accuracy of thread grade, lose screw thread kinetic energy, stress failure.
Technical scheme is used by the utility model solves its technical problem：A kind of self-locking pedicle screw is provided,
Including：Nail rod and nail tail, nail rod are fixedly connected with nail tail, follow closely that tail is remote is provided with internal thread, interior spiral shell with one end of nail rod junction
Line is thin-walled tomography screw thread, and screw thread is formed by region of circling round around central shaft spiral, and convolution region is through thread center's axis
It is sequentially connected with section in multiple convolution units, convolution unit includes：The first line segment, second line segment and the 3rd line being sequentially connected with
Section, the angle between second line segment and the 3rd line segment is 85 °~95 °.
Preferably, the maximum open width of the first line segment and second line segment angle is less than the pitch of the screw thread,
Preferably, convolution unit is evenly distributed on through on the section of thread center's line vertically.
Preferably, angle is 30 °~45 ° between the first line segment and second line segment.
Preferably, being provided with the 4th line segment between the first line segment and second line segment, the 4th line segment is parallel with the 3rd line segment.
The utility model also provides one kind and holds out against plug screw, it is characterised in that including：With such as any one of Claims 1 to 5 institute
The external screw thread that the internal thread stated is engaged.
The beneficial effects of the utility model are：The utility model provides a kind of self-locking pedicle screw, and screw thread is by returning
Rotation region forms around central shaft spiral, and convolution region sequentially connects on the section through thread center's axis in multiple convolution units
Connect, convolution unit includes：The first line segment, second line segment and the 3rd line segment being sequentially connected with, between second line segment and the 3rd line segment
Angle be 85 °~95 °, solve thin-walled screw thread or be deformed or expand when Serial section Screw assembly holds out against plug screw, break
Bad accuracy of thread grade, make screw thread kinetic energy lose, stress fail the problem of.
Brief description of the drawings
The utility model is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is a kind of schematic diagram of self-locking pedicle screw of the present utility model；
Fig. 2 is the structural representation of embodiment 2；
Fig. 3 is external screw thread and the schematic diagram of screw-internal thread fit；
Fig. 4 is pedicle nail and holds out against the assembling schematic diagram of plug screw；
Fig. 5 is the screw thread force diagram of prior art；
Fig. 6 is the screw thread force diagram of embodiment 2 of the present utility model；
Fig. 7 is the screw thread force diagram of embodiment 1 of the present utility model；
In figure：1. the first line segment, 2. second line segments, 3. the 3rd line segments, 4. the 4th line segments, 5. pedicle nails, 51. nail rods,
52. following closely tail, 6. hold out against plug screw.
Embodiment
The utility model is described in further detail presently in connection with accompanying drawing.These accompanying drawings are simplified schematic diagram,
Only illustrate basic structure of the present utility model in a schematic way, therefore it only shows the composition relevant with the utility model.
Embodiment 1
As shown in figure 1, the utility model provides a kind of self-locking pedicle screw, a kind of self-locking pedicle screw,
Including：Nail rod 51 and nail tail 52, nail rod 51 are fixedly connected with nail tail 52, and the remote one end with the junction of nail rod 51 of nail tail 2 is provided with
Internal thread, internal thread are thin-walled tomography screw thread, and internal thread is formed by region of circling round around central shaft spiral, and convolution region is through spiral shell
It is sequentially connected with the section of line central axis in multiple convolution units, convolution unit is triangle, the self-lock ability of angular thread
By force, locking property is good, and convolution unit is evenly distributed on through on the section of thread center's axis vertically, and the pitch of screw thread is constant
, it is more easy to assemble, prevents from damaging tooth silk because of the difference of pitch, cause the deformation or expansion of screw thread, convolution unit includes：Sequentially
The first line segment 1, the line segment 3 of second line segment 2 and the 3rd of connection, the first line segment 1 and angle β of second line segment 2 maximum open width
Less than the pitch of screw thread, the angle α between the line segment 3 of second line segment 2 and the 3rd is 85 °, as shown in Figure 7 so that normal pressure F is hanging down
Directly offseted in the component on axial force E directions with frictional force f in the component on axial force E directions, axial force E is vertical
The expansive force being subject on direction is smaller so that and thin-wall part screw thread or Serial section screw thread are less likely to occur to deform or expanded, the
Angle β is 30 ° between one line segment 1 and second line segment 2, and the screw thread self-locking performance of closely-pitched is more preferable, is usually used in light-wall pipe.
Embodiment 2
As shown in Fig. 2 the utility model provides a kind of self-locking pedicle screw, a kind of self-locking pedicle screw,
Including：Nail rod 51 and nail tail 52, nail rod 51 are fixedly connected with nail tail 52, and the remote one end with the junction of nail rod 51 of nail tail 52 is provided with
Internal thread, internal thread are thin-walled tomography screw thread, and internal thread is formed by region of circling round around central shaft spiral, and convolution region is through interior
It is sequentially connected with the section of thread center's axis in multiple convolution units, convolution unit is evenly distributed on through in screw thread vertically
On the section of mandrel line, the pitch of screw thread is constant, is more easy to assemble, and prevents from damaging tooth silk because of the difference of pitch, causes spiral shell
The deformation or expansion of line, convolution unit include：The first line segment 1, the line segment 3 of second line segment 2 and the 3rd being sequentially connected with, the first line segment
1 is less than the pitch of internal thread with the angle β of second line segment 2 maximum open width, the folder between the line segment 3 of second line segment 2 and the 3rd
Angle α is 90 °, as shown in Figure 6 so that normal pressure F directions are consistent with axial force E directions, reduce and the perpendicular direction of axial force
Meeting allow the component that screw thread is deformed so that the expansive force in axial force E vertical direction is frictional force f, reduces expansive force,
So that thin-wall part screw thread or Serial section screw thread are less likely to occur to deform or expanded, angle between the first line segment 1 and second line segment 2
β is 45 °, and the screw thread self-locking performance of closely-pitched is more preferable, is usually used in light-wall pipe, and the one the first are provided between line segment 1 and second line segment 2
4th line segment 4, the 4th line segment 4 is parallel with the 3rd line segment 3, convolution unit is become in echelon so that the manufacturability of screw thread is more preferable, spiral shell
Away from and tooth form it is all bigger, precision is higher, and sealing property is more preferable, and frictional force is smaller in transmission parts, and service life is longer, less
Easily loosen, in Serial section nut, can adjust and eliminate gap.
Embodiment 3
As shown in figure 5, the utility model, which provides a kind of modified, holds out against plug screw, including：With as described in embodiment 1 or 2
The external screw thread that is engaged of internal thread.
Using it is above-mentioned according to desirable embodiment of the present utility model as enlightenment, pass through above-mentioned description, related work people
Member can carry out various changes and amendments in the range of without departing from this item utility model technological thought completely.This item is real
The content being not limited to new technical scope on specification, it is necessary to which its technology is determined according to right
Property scope.
Claims (6)
1. a kind of self-locking pedicle screw, including：Nail rod（51）With nail tail（52）, nail rod（51）With following closely tail（52）It is fixed to connect
Connect, follow closely tail（52）Remote and nail rod（51）One end of junction is provided with internal thread, and internal thread is thin-walled tomography screw thread, and its feature exists
In：The internal thread is formed by region of circling round around central shaft spiral, and the convolution region is in cutting through internal thread central axis
It is sequentially connected with face in multiple convolution units, the convolution unit includes：The first line segment being sequentially connected with（1）, second line segment（2）
With the 3rd line segment（3）, it is characterised in that：The second line segment（2）With the 3rd line segment（3）Between angle α be 85 °~95 °.
A kind of 2. self-locking pedicle screw as claimed in claim 1, it is characterised in that：First line segment（1）With second
Line segment（2）Angle β maximum open width is less than the pitch of the screw thread.
A kind of 3. self-locking pedicle screw as claimed in claim 1, it is characterised in that：The convolution unit is uniform vertically
It is distributed in through on the section of internal thread central axis.
A kind of 4. self-locking pedicle screw as claimed in claim 1, it is characterised in that：First line segment（1）With second
Line segment（2）Between angle β be 30 °~45 °.
A kind of 5. self-locking pedicle screw as claimed in claim 1, it is characterised in that：First line segment（1）With second
Line segment（2）Junction is provided with the 4th line segment（4）, the 4th line segment（4）With the 3rd line segment（3）It is parallel.
6. one kind holds out against plug screw, it is characterised in that including：Being engaged with the internal thread as described in any one of Claims 1 to 5
External screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621437466.9U CN206659901U (en) | 2016-12-26 | 2016-12-26 | A kind of self-locking pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621437466.9U CN206659901U (en) | 2016-12-26 | 2016-12-26 | A kind of self-locking pedicle screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206659901U true CN206659901U (en) | 2017-11-24 |
Family
ID=60357241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621437466.9U Active CN206659901U (en) | 2016-12-26 | 2016-12-26 | A kind of self-locking pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206659901U (en) |
-
2016
- 2016-12-26 CN CN201621437466.9U patent/CN206659901U/en active Active
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