CN219878259U - Broken pedicle screw extractor - Google Patents
Broken pedicle screw extractor Download PDFInfo
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- CN219878259U CN219878259U CN202320601591.2U CN202320601591U CN219878259U CN 219878259 U CN219878259 U CN 219878259U CN 202320601591 U CN202320601591 U CN 202320601591U CN 219878259 U CN219878259 U CN 219878259U
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- internal thread
- sleeve
- broken
- pedicle screw
- engagement sleeve
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- 230000006835 compression Effects 0.000 claims abstract description 45
- 238000007906 compression Methods 0.000 claims abstract description 45
- 230000013011 mating Effects 0.000 claims description 3
- 206010048886 Onychoclasis Diseases 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 22
- 230000005540 biological transmission Effects 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
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- Surgical Instruments (AREA)
Abstract
The utility model provides a broken pedicle screw extractor, and relates to the field of broken screw extractors. The pedicle screw breaking extractor comprises an engagement sleeve and a threaded compression bar, wherein the threaded compression bar is in threaded connection with the engagement sleeve, one end of the engagement sleeve is provided with an annular drill bit, and the other end of the engagement sleeve is provided with a rotation stopping part; the inside of the engagement sleeve is provided with a first internal thread, the first internal thread is arranged close to the annular drill bit, the annular drill bit is used for being in clearance fit with the broken nails, and the first internal thread is used for being matched with the external threads of the broken nails; the inside of the engagement sleeve is also provided with a second internal thread which is far away from the annular drill bit, and the threaded compression bar is matched with the second internal thread; the screw thread depression bar has the roof pressure end and revolves the portion of twisting, and the roof pressure end is used for with the terminal surface top tight fit of broken nail. The high-strength combination between the broken nails and the occlusion sleeve is converted through the jacking force of the threaded compression bar, the situation that torque cannot be transmitted to the broken nails due to slipping is avoided, and the use effect of taking out the broken nails is better.
Description
Technical Field
The utility model relates to the technical field of broken nail extractors, in particular to a broken pedicle nail extractor.
Background
In the spinal joint, the pedicles are the components forming the intervertebral foramen, starting from the posterior superior portion of the vertebral body, short and slender. Because the pedicle is hard and bears high pressure, the fracture operation of thoracolumbar vertebrae is easy to occur and the screw fracture can not be taken out.
The Chinese patent application publication No. CN217660092U and publication No. 2022.10.28 discloses a broken pedicle screw extractor, which comprises a screw taking part and a drilling part, wherein the screw taking part is arranged on the drilling part in a sliding manner, a limiting part for limiting the axial and circumferential movement of the screw taking part is arranged on the drilling part, one end of the screw taking part is provided with a plurality of elastic clamping pieces which are annularly arranged, a clamping space is defined by the plurality of elastic clamping pieces, a movable tightening part is also arranged on the screw taking part, and the clamping space is tightened when the tightening part moves to the outside of the elastic clamping pieces; one end of the drilling piece is provided with an annular drill bit, the end face of the annular drill bit extends inwards to form a yielding hole, and the second end of the drilling piece is provided with a clamping position which is in butt joint with the rotating tool.
The broken pedicle screw extractor in the prior art is provided with a drilling part which can punch an annular hole along the broken spine screw to expose the broken end of the spine screw, then an elastic clamping piece of the screw taking part slides to the periphery of the broken end, the elastic clamping pieces are mutually close and clamp the broken end of the spine screw through a tightening part, and the drilling part is rotated to unscrew the spine screw.
However, when the elastic clamping piece is used for clamping the broken ends of the spine nails, the elastic clamping piece is easy to slip when the drilling piece is rotated, so that torsion moment can not be effectively transmitted to the broken nails, and the using effect of taking out the broken nails is poor.
Disclosure of Invention
In order to solve the problems, the utility model aims to provide a broken pedicle screw extractor, which solves the problems that the broken screw is easy to slip due to the clamping of an elastic clamping piece, the torsion moment can not be effectively transmitted to the broken screw, and the using effect of taking out the broken screw is poor.
The technical scheme of the pedicle screw breaking extractor provided by the utility model is as follows:
the pedicle screw breaking extractor comprises an engagement sleeve and a threaded compression rod, wherein the threaded compression rod is in threaded connection with the engagement sleeve, one end of the engagement sleeve is provided with an annular drill bit, and the other end of the engagement sleeve is provided with a rotation stopping part;
the inside of the occlusion sleeve is provided with a first internal thread, the first internal thread is arranged close to the annular drill bit, the annular drill bit is used for being in clearance fit with the broken nail, and the first internal thread is used for being matched with the external thread of the broken nail;
the inside of the engagement sleeve is also provided with a second internal thread which is arranged far away from the annular drill bit, and the threaded compression bar is matched with the second internal thread;
the screw thread depression bar has the top pressure end that stretches into in the interlock sleeve, and stretches out the outside portion of screwing up of interlock sleeve, the top pressure end is used for with the terminal surface top tight fit of broken nail.
Further, the drilling device further comprises a drilling handle which is detachably connected with the engagement sleeve, and the drilling handle is provided with a matching part which is in clamping fit with the rotation stopping part.
Further, the cylindrical sleeve of the engagement sleeve, the rotation stopping portion is a prismatic portion, and the radial dimension of the inscribed circle of the prismatic portion is greater than or equal to the radial dimension of the engagement sleeve.
Further, the rotation stopping part is a hexagonal prism part, the drilling handle is an outer hexagonal handle, and the matching part of the drilling handle is a hexagonal hole.
Further, the threaded compression bar is a T-shaped compression bar, the T-shaped compression bar comprises a transverse bar and a vertical bar which are fixedly connected, and the transverse bar forms a screwing part of the threaded compression bar;
the vertical rod is provided with external threads, the external threads of the vertical rod are matched with the second internal threads, and the end part of the vertical rod, which is far away from the transverse rod, forms the top pressing end of the threaded compression rod.
Further, the screwing direction of the first internal thread is opposite to that of the second internal thread, and a unthreaded hole section is further arranged in the engagement sleeve and is arranged between the first internal thread and the second internal thread.
Further, the rotation direction of the first internal thread is the same as the rotation direction of the second internal thread.
Further, the first internal thread has an inner diameter dimension of any of 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm and 6.5mm, and the first internal thread has an axial dimension of any dimension between 10mm and 35 mm.
The beneficial effects are that: the pedicle screw breaking extractor adopts a design form of an engagement sleeve and a threaded compression bar, wherein one end of the engagement sleeve is provided with an annular drill bit, the other end of the engagement sleeve is provided with a rotation stopping part, the engagement sleeve is sleeved outside a broken screw, the engagement sleeve is rotated through the rotation stopping part, bones around the broken screw are broken to form an annular groove, and external threads on the surface of the broken screw are exposed; and then the first internal thread of the engagement sleeve is matched with the external thread of the broken nail, so that the engagement sleeve is fixedly connected with the end part of the broken nail.
The second internal thread is further arranged in the engagement sleeve, the threaded compression rod can be screwed into the engagement sleeve by utilizing the matching relation between the second internal thread and the threaded compression rod, and the jacking end of the threaded compression rod contacts and jacks the end face of the broken nail along with the continuous screwing of the threaded compression rod; at this time, under the jacking action of the screw thread pressing rod on the broken nail, the external screw thread of the broken nail and the first internal screw thread of the occlusion sleeve form cold welding, namely, the larger the jacking force is, the higher the bonding strength between the broken nail and the occlusion sleeve is.
Finally, through reverse rotation interlock sleeve, can drive broken nail and withdraw from the vertebral arch root hole, through the high strength combination between broken nail and the interlock sleeve of the top pressure conversion of screw thread depression bar, avoided because of the slippage and can't be to the condition of broken nail transmission moment of torsion, take out the result of use of broken nail better.
Drawings
FIG. 1 is a perspective view of a pedicle screw remover in an embodiment of the pedicle screw remover of the utility model;
FIG. 2 is a vertical cross-sectional view of a pedicle screw remover (in a tightly-loaded broken state) in an embodiment of the pedicle screw remover;
FIG. 3 is a schematic perspective view of a threaded compression bar in an embodiment of the pedicle screw extractor of the present utility model;
fig. 4 is a schematic perspective view of a drill handle mated with a bite sleeve in an embodiment of a pedicle screw extractor of the utility model.
In the figure: 1-occlusion sleeve, 10-ring bit, 11-first internal thread, 12-second internal thread, 13-rotation stopping part, 2-thread compression bar, 20-external thread of vertical rod, 21-transverse rod, 22-vertical rod, 23-top pressure end, 3-broken nail, 30-broken nail external thread and 4-drilling handle.
Detailed Description
The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
In the specific embodiment 1 of the pedicle screw extractor, as shown in fig. 1 to 4, the pedicle screw extractor comprises a meshing sleeve 1 and a threaded compression rod 2, wherein the threaded compression rod 2 is in threaded connection with the meshing sleeve 1, one end of the meshing sleeve 1 is provided with an annular drill bit 10, and the other end of the meshing sleeve 1 is provided with a rotation stopping part 13; the inside of the snap-in sleeve 1 is provided with a first internal thread 11, the first internal thread 11 being arranged close to the ring bit 10, the ring bit 10 being intended for clearance fit with the broken nail 3, the first internal thread 11 being intended for cooperation with the external thread 30 of the broken nail.
The inside of the engagement sleeve 1 is also provided with a second internal thread 12, the second internal thread 12 is arranged far away from the annular drill bit 10, and the threaded compression bar 2 is matched with the second internal thread 12; the threaded compression bar 2 has a pressing end 23 which protrudes into the bite sleeve 1 and a screwing part which protrudes outside the bite sleeve 1, the pressing end 23 being intended for a tight fit with the end face of the broken nail 3.
The pedicle screw breaking extractor adopts a design form of a meshing sleeve 1 and a threaded compression rod 2, wherein one end of the meshing sleeve 1 is provided with an annular drill bit 10, the other end of the meshing sleeve 1 is provided with a rotation stopping part 13, the meshing sleeve 1 is sleeved outside a screw breaking 3, the meshing sleeve 1 is rotated through the rotation stopping part 13, bones around the screw breaking 3 are broken to form an annular groove, and external threads on the surface of the screw breaking 3 are exposed; the first internal thread 11 of the engagement sleeve 1 is then matched with the external thread 30 of the broken nail, so that the engagement sleeve 1 is fixedly connected to the end of the broken nail 3.
The second internal thread 12 is further arranged in the engagement sleeve 1, the threaded compression rod 2 can be screwed into the engagement sleeve 1 by utilizing the matching relationship between the second internal thread 12 and the threaded compression rod 2, and the pressing end 23 of the threaded compression rod 2 is contacted with and tightly presses the end face of the broken nail 3 along with the continuous screwing of the threaded compression rod 2; at this time, under the action of the pushing pressure of the screw-thread pressing rod 2 to the broken nail 3, the external thread 30 of the broken nail and the first internal thread 11 of the occlusion sleeve 1 form cold welding, that is, the larger the pushing pressure is, the higher the bonding strength between the broken nail 3 and the occlusion sleeve 1 is.
Finally, through reverse rotation interlock sleeve 1, can drive broken nail 3 and withdraw from the vertebral arch root hole, through the high strength combination between broken nail 3 and the interlock sleeve 1 of the roof pressure conversion of screw thread depression bar 2, avoided because of the slippage and can't be to the condition of broken nail transmission moment of torsion, take out the result of use of broken nail better.
In this embodiment, the pedicle screw extractor further comprises a drill handle 4, the drill handle 4 being detachably connected to the engagement sleeve 1, the drill handle 4 having a mating portion for snap-fitting engagement with the rotation stop portion 13. Before drilling, the drilling handle 4 is firstly arranged on the rotation stopping part 13 of the engagement sleeve 1, as shown in fig. 4, the drilling handle 4 is operated to drive the engagement sleeve 1 to synchronously rotate, so that the purpose of forming an annular groove around the broken nail 3 is achieved, and then the threaded compression bar 2 can be arranged by detaching the drilling handle 4.
As a further preferred embodiment, the cylindrical sleeve of the snap sleeve 1, the rotation stop 13 is a prismatic part, the inscribed circle radial dimension of which is greater than or equal to the radial dimension of the snap sleeve 1. Specifically, the rotation stopping portion 13 is a hexagonal prism portion, the drilling handle 4 is an external hexagonal handle, and the matching portion of the drilling handle 4 is a hexagonal hole. The rotation stopping portion 13 is designed to be a hexagonal prism portion, so that the rotation stopping portion can be matched with the drilling handle 4 in the drilling stage, and the hexagonal prism portion can be clamped by a wrench when the engagement sleeve 1 is rotated reversely finally, so that sufficient torque is generated on the broken nails 3 to take out the broken nails 3.
The threaded compression bar 2 is a T-shaped compression bar, the T-shaped compression bar comprises a transverse bar 21 and a vertical bar 22 which are fixedly connected, and the transverse bar 21 forms a screwing part of the threaded compression bar 2; the vertical rod 22 is provided with external threads, the external threads 20 of the vertical rod are matched with the second internal threads 12, and the end part of the vertical rod 22 far away from the transverse rod 21 forms a jacking end 23 of the threaded compression rod 2.
The direction of the first internal thread 11 is opposite to the direction of the second internal thread 12, and a unthreaded hole section is further provided in the snap sleeve 1, and the unthreaded hole section is interposed between the first internal thread 11 and the second internal thread 12. When the occlusion sleeve 1 is installed, the occlusion sleeve 1 is rotated forward to be connected with the broken nails 3 in a threaded mode, the threaded compression rod 2 is installed in a reverse rotation mode, the threaded compression rod 2 and the broken nails 3 can be tightly and fully abutted, and when the broken nails 3 are taken out, the broken nails 3 can be taken out by rotating the occlusion sleeve 1 in the reverse direction.
In addition, the inner diameter of the first internal thread 11 may be any of 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm and 6.5mm, and the axial dimension of the first internal thread 11 may be any of 10mm to 35mm, thereby satisfying the extraction requirements of pedicle screws of different types.
In other embodiments of the pedicle screw remover of the utility model, two threads inside the occlusion sleeve may be designed adaptively to meet different usage requirements, such as: the screwing direction of the first internal thread is the same as that of the second internal thread. When the occlusion sleeve is installed, the occlusion sleeve is rotated forward to be connected with the broken screw threads, the threaded compression bar is installed in a forward rotation mode, the threaded compression bar and the broken screw are enabled to be tightly pressed fully, and when the broken screw is taken out, the occlusion sleeve is rotated in a reverse direction, so that the broken screw can be taken out.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.
Claims (8)
1. The broken pedicle screw extractor is characterized by comprising an engagement sleeve and a threaded compression rod, wherein the threaded compression rod is in threaded connection with the engagement sleeve, one end of the engagement sleeve is provided with an annular drill bit, and the other end of the engagement sleeve is provided with a rotation stopping part;
the inside of the occlusion sleeve is provided with a first internal thread, the first internal thread is arranged close to the annular drill bit, the annular drill bit is used for being in clearance fit with the broken nail, and the first internal thread is used for being matched with the external thread of the broken nail;
the inside of the engagement sleeve is also provided with a second internal thread which is arranged far away from the annular drill bit, and the threaded compression bar is matched with the second internal thread;
the screw thread depression bar has the top pressure end that stretches into in the interlock sleeve, and stretches out the outside portion of screwing up of interlock sleeve, the top pressure end is used for with the terminal surface top tight fit of broken nail.
2. The pedicle screw remover of claim 1, further comprising a drill handle detachably connected to the engagement sleeve, the drill handle having a mating portion that snap-fits with the rotation stop portion.
3. The pedicle screw remover as claimed in claim 2, wherein the cylindrical sleeve of the occlusion sleeve, the rotation stop is a prismatic section having an inscribed circular radial dimension greater than or equal to the radial dimension of the occlusion sleeve.
4. The pedicle screw remover as claimed in claim 3, wherein the rotation stop portion is a hexagonal prism portion, the drill handle is an external hexagonal handle, and the mating portion of the drill handle is a hexagonal hole.
5. The pedicle screw remover of claim 1, wherein the threaded compression bar is a T-shaped compression bar comprising a transverse bar and a vertical bar fixedly connected, the transverse bar forming a screw-on portion of the threaded compression bar;
the vertical rod is provided with external threads, the external threads of the vertical rod are matched with the second internal threads, and the end part of the vertical rod, which is far away from the transverse rod, forms the top pressing end of the threaded compression rod.
6. The pedicle screw remover of claim 1, wherein the direction of rotation of the first internal thread is opposite to the direction of rotation of the second internal thread, and the interior of the occlusion sleeve is further provided with a unthreaded hole section, the unthreaded hole section being interposed between the first internal thread and the second internal thread.
7. The pedicle screw remover of claim 1, wherein the direction of rotation of the first internal thread is the same as the direction of rotation of the second internal thread.
8. The pedicle screw extractor as claimed in claim 1, wherein the first internal thread has an internal diameter dimension of any of 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm and 6.5mm, the first internal thread having an axial dimension of any dimension between 10mm and 35 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320601591.2U CN219878259U (en) | 2023-03-23 | 2023-03-23 | Broken pedicle screw extractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320601591.2U CN219878259U (en) | 2023-03-23 | 2023-03-23 | Broken pedicle screw extractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219878259U true CN219878259U (en) | 2023-10-24 |
Family
ID=88406737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320601591.2U Active CN219878259U (en) | 2023-03-23 | 2023-03-23 | Broken pedicle screw extractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219878259U (en) |
-
2023
- 2023-03-23 CN CN202320601591.2U patent/CN219878259U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 528318 No.39 Donghua Road, Longjiang Town, Shunde District, Foshan City, Guangdong Province Patentee after: Foshan Shunde District Fifth People's Hospital (Foshan Shunde District Longjiang Hospital) Country or region after: China Address before: 528318 No.39 Donghua Road, Longjiang Town, Shunde District, Foshan City, Guangdong Province Patentee before: THE THIRD AFFILIATED HOSPITAL OF GUANGDONG MEDICAL University (FOSHAN SHUNDE LONGJIANG Hospital) Country or region before: China |