CN203564323U - Improved vertebral pedicle extending device - Google Patents
Improved vertebral pedicle extending device Download PDFInfo
- Publication number
- CN203564323U CN203564323U CN201320764621.8U CN201320764621U CN203564323U CN 203564323 U CN203564323 U CN 203564323U CN 201320764621 U CN201320764621 U CN 201320764621U CN 203564323 U CN203564323 U CN 203564323U
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- China
- Prior art keywords
- nail body
- pedicle
- core rod
- rear nail
- screw
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 238000010079 rubber tapping Methods 0.000 claims abstract description 18
- 238000003780 insertion Methods 0.000 claims abstract description 7
- 230000037431 insertion Effects 0.000 claims abstract description 7
- 210000000078 claw Anatomy 0.000 claims description 9
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 206010025005 lumbar spinal stenosis Diseases 0.000 description 4
- 208000005198 spinal stenosis Diseases 0.000 description 4
- 208000024891 symptom Diseases 0.000 description 4
- 210000000988 bone and bone Anatomy 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 210000005036 nerve Anatomy 0.000 description 2
- 230000002980 postoperative effect Effects 0.000 description 2
- 208000008035 Back Pain Diseases 0.000 description 1
- 206010005963 Bone formation increased Diseases 0.000 description 1
- 206010020880 Hypertrophy Diseases 0.000 description 1
- 206010022562 Intermittent claudication Diseases 0.000 description 1
- 208000003618 Intervertebral Disc Displacement Diseases 0.000 description 1
- 206010050296 Intervertebral disc protrusion Diseases 0.000 description 1
- 208000008930 Low Back Pain Diseases 0.000 description 1
- 206010029174 Nerve compression Diseases 0.000 description 1
- 208000002193 Pain Diseases 0.000 description 1
- 241001079814 Symphyotrichum pilosum Species 0.000 description 1
- 235000004224 Typha angustifolia Nutrition 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002639 bone cement Substances 0.000 description 1
- 210000003164 cauda equina Anatomy 0.000 description 1
- 208000024980 claudication Diseases 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 210000004262 dental pulp cavity Anatomy 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 206010020718 hyperplasia Diseases 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 238000002324 minimally invasive surgery Methods 0.000 description 1
- 230000002981 neuropathic effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002271 resection Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
Images
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- Surgical Instruments (AREA)
- Prostheses (AREA)
Abstract
The utility model relates to an improved vertebral pedicle extending device consisting of a core rod as well as a front nail body and a rear nail body which are respectively in threaded connection with two ends of the core rod, wherein the external surfaces of the front nail body and the rear nail body are provided with self-tapping threads with equal thread pitch. The improved vertebral pedicle extending device is characterized in that an insertion structure is arranged between the front nail body and the rear nail body; when the front nail body and the rear nail body are inserted together, a pedicle screw is formed; the pedicle screw is provided with a thread hole along the axis; internal threads in the thread hole are same in screwing direction, and the thread pitch of internal threads in the rear nail body is greater than that of internal threads in the front nail body; two ends of the core rod are respectively provided with external threads matched with the internal threads arranged in the front nail body and the rear nail body, and the middle of the core rod is provided with a polished rod, and the length of the core rod is equal to sum of the length of the pedicle screw formed by inserting the front nail body and the rear nail body together and the preset vertebral pedicle extending length. The improved vertebral pedicle extending device not only can be used for avoiding the risk that a vertebral body is pushed to move in a direction away from the vertebral pedicle, and has the advantage of stability.
Description
Technical Field
The utility model relates to a medical surgery apparatus, concretely relates to backbone internal fixation device, the device are applicable to the disconnected extension art of capable pedicle of vertebral arch.
Background
Lumbar spinal stenosis refers to a series of clinical symptoms caused by various causes such as intervertebral disc protrusion, hyperosteogeny or fibrous tissue hyperplasia, and hypertrophy to narrow the spinal canal or nerve root canal or intervertebral foramen, and to stimulate and press the nerve root or cauda equina. The typical clinical manifestations of lumbar spinal stenosis are: low back pain, neuropathic claudication, intermittent radiation pain of the lower extremities, exacerbation of symptoms when standing, moving or hyperextending the waist for a long time, and alleviation when sitting, lying or flexing the waist. The conservative treatment of the patients with lumbar spinal stenosis can not improve symptoms and is solved by adopting an operation method.
The operation methods adopted at present in clinic are mainly resection decompression, pedicle screw internal fixation and intervertebral fusion of partial or all vertebral plates, articular processes and the like in the posterior path, so that the vertebral canal and intervertebral foramen are enlarged, and the aim of relieving the nerve compression is fulfilled. In practical application, when the pedicle screw internal fixation device is adopted, complications such as internal fixation failure and adjacent segment degeneration aggravation often exist, and meanwhile, the operation is complex, the wound is large, the cost is high, the postoperative recovery is slow, and the reoperation rate is high.
The minimally invasive surgery is a necessary trend of surgical development, and the minimally invasive treatment of the lumbar spinal stenosis comprises percutaneous nail rod system implantation, spinous process distraction, pedicle of vertebral arch separation elongation and the like. The vertebral pedicle extension fixing device can extend the area of the vertebral canal and the intervertebral foramen by extending the broken vertebral pedicle, thereby improving clinical symptoms. The fixing device can improve the minimally invasive degree of the spinal canal enlarging and forming operation, improve the nail placing accuracy, reduce the operation trauma, shorten the operation and the postoperative rehabilitation time and the like.
The patent application with publication number CN101695453A discloses a pedicle extension device, which comprises a front nail, a core bar, a rear nail and a fixer, wherein the core bar is of a hollow structure, the middle part of the core bar is provided with a communicated through hole, the front end of the core bar is in threaded connection with the front nail, the rear end of the core bar is sleeved with the rear nail, and the core bar is in sliding connection with the rear nail; the fixer is fixedly connected to the rear end of the rear nail and enables the core bar and the rear nail to be relatively fixed. The scheme of the patent application utilizes the screw thread on the surface of the rear nail to fix the rear nail on the separated vertebral pedicle, and then twists the fixer (nut) to enable the core rod and the front nail to slide forwards in the rear nail, so as to push the vertebral body to move towards the direction far away from the vertebral pedicle, thereby achieving the purpose of expanding the vertebral canal and the intervertebral foramen. However, the solution described in the above patent application still has the following disadvantages: (1) the screw thread on the surface of the rear nail is used for connecting the vertebral pedicle and the fixer (nut) (see figure 2 of the patent application), so that the screw thread on the surface of the rear nail cannot be selected to be self-tapping screw thread, and the connection between the rear nail and the vertebral pedicle is obviously not firm enough; (2) because a relatively large fit clearance exists between the core rod and the rear nail, and the core rod and the fixer (nut) cannot be fixed together after the centrum and the pedicle of vertebral arch are expanded, the core rod and the centrum can not only shake under the action of external force, but also can continuously move towards the direction far away from the fixer (nut) (the centrum is pushed to move towards the direction far away from the pedicle of vertebral arch), so the defects of infirm fixation and poor stability obviously exist; (3) the front nail is only inserted in the installation guide hole, and the risk that the vertebral body moves towards the direction far away from the fixer (nut) also exists.
The scheme of the utility model patent application with the publication number of CN201912218U is improved by adding a scale on the basis of the scheme of the invention patent application with the publication number of CN101695453A, so that the defects of the invention patent application with the publication number of CN101695453A exist.
Disclosure of Invention
In view of the above-mentioned not enough that exists on the prior art, the utility model aims to solve the technical problem that an improved generation pedicle of vertebral arch extension device is provided, the device not only can avoid promoting the risk that the centrum removed to keeping away from the pedicle of vertebral arch direction, has the advantage of stability moreover.
The utility model provides a scheme as follows of above-mentioned technical problem:
an improved pedicle extension device comprises a core rod, a front nail body and a rear nail body which are respectively in threaded connection with two ends of the core rod, wherein self-tapping threads with the same thread pitch are arranged on the outer surfaces of the front nail body and the rear nail body; the pedicle screw is provided with a threaded hole along the axial lead, the turning directions of internal threads in the threaded hole are the same, and the pitch of the internal threads in the rear screw body is greater than that in the front screw body; the two ends of the core rod are respectively provided with external threads matched with the internal threads arranged in the front nail body and the rear nail body, the middle part of the core rod is a polished rod, and the length of the core rod is equal to the sum of the length of a pedicle screw formed by splicing the front nail body and the rear nail body and the preset and extended length of the pedicle screw.
In the above technical solution of the present invention, because the task that the plug connection structure undertakes is to provide the required torque when inserting the front nail body and the rear nail body into the pedicle screw formed from the guiding hole and screwing in the lumbar vertebra, the plug connection structure can be provided with various connection structures of the torque, and the ideal scheme in the structure has the following two kinds. Wherein,
the first scheme is that one of the heads of the front nail body and the rear nail body opposite to each other is provided with an outer hexagon, and the other head is provided with an inner hexagon matched with the outer hexagon; and after the front nail body and the rear nail body are spliced together, self-tapping threads arranged on the outer surfaces of the front nail body and the rear nail body are continuous.
The other scheme is that fan-shaped claws and fan-shaped grooves are respectively arranged on the opposite end surfaces of the front nail body and the rear nail body in a staggered manner, and the cross sections of the fan-shaped claws and the fan-shaped grooves are both fan-shaped with the same shape and the same area; and after the front nail body and the rear nail body are spliced together, self-tapping threads arranged on the outer surfaces of the front nail body and the rear nail body are separated from each other by the same spiral thread in the length interval of the fan-shaped claw.
In the above technical solution of the present invention, the core rod may be provided with a central hole along the axis, and the surface of the front nail body may be provided with a plurality of small holes, so that the bone cement may be poured into the bone through the channel formed by the central hole and the small holes during the operation to reinforce the loosened bone. These are all readily apparent to one of ordinary skill in the art.
Compared with the common pedicle screw, the improved pedicle screw extension device has the advantages that the core rod is added, the pedicle screw is formed by splicing the front screw body and the rear screw body, and the screw teeth of the front screw body, which are tapped on the lumbar vertebra, are damaged by the rear screw body in the tapping process if the self-tapping threads of the outer surface are staggered after the two are spliced. In order to solve the technical problems, the inventor recommends a reliable method that the front nail body and the rear nail body are inserted and clamped and fixed together (as shown in a state of figure 1) before the self-tapping threads are machined, and then the self-tapping threads on the surfaces of the front nail body and the rear nail body are machined by one-time feeding.
Furthermore, because in the improved generation pedicle of vertebral arch extension device, internal screw thread pitch is greater than internal screw thread pitch in the preceding nail body in the back nail body, is equipped with grafting connection structure between preceding nail body and the back nail body moreover, consequently with preceding nail body and back nail body respectively from both ends screw up the back on the core bar, must fix preceding nail body and back nail body and not let them rotate and twist the core bar and just can utilize internal screw thread pitch difference in the back nail body and the preceding nail body, peg graft preceding nail body and back nail body together.
Pedicle of vertebral arch extension device than prior art have following beneficial effect:
1. the outer surfaces of the front nail body and the rear nail body are provided with self-tapping threads with the same thread pitch, when the front nail body and the rear nail body are inserted together, a pedicle screw is formed, and the rear nail body is connected with the core rod through threads, so that the risk of centrum and movement along the axis of the core rod can be avoided.
2. The rear nail is connected with the vertebral pedicle by self-tapping threads, can bear larger axial force and is relatively stable and reliable.
3. The pitch of the internal thread in the rear nail body is greater than that of the internal thread in the front nail body, so that the broken pedicle of vertebral arch is pushed backwards when the core rod is screwed, and the device is more in line with the physiological characteristics of a human body compared with the prior art.
4. The length of the core rod is equal to the sum of the depth of the blind hole and the preset extension length of the vertebral pedicle, so that the core rod cannot retract into the front screw body after the broken vertebral pedicle is stretched for a preset distance, and the stability of integral fixation is obviously improved.
Drawings
Fig. 1 and 2 are schematic structural views of an embodiment of the improved pedicle extension device of the present invention; in which fig. 1 is a front view, and fig. 2 is a cross-sectional view (enlarged) taken along line a-a of fig. 1.
Fig. 3 is a schematic structural diagram of the front nail body and the rear nail body in the embodiment shown in fig. 1 and 2, wherein arrows indicate the insertion direction of the front nail body and the rear nail body.
Fig. 4 is a schematic structural view of the core rod in the embodiment shown in fig. 1 and 2.
Fig. 5 and 6 are installation state diagrams of the improved pedicle extension device of the present invention; wherein, fig. 5 is a state diagram before pedicle extension, and fig. 6 is a state diagram after pedicle extension.
FIGS. 7 and 8 are schematic views of another embodiment of the improved pedicle extension device of the present invention; in which fig. 7 is a front view, and fig. 8 is a sectional view (enlarged) taken along line B-B of fig. 7.
Fig. 9 is a schematic structural view of the front nail body and the rear nail body in the embodiment shown in fig. 7 and 8, wherein arrows indicate the insertion direction of the front nail body and the rear nail body.
Detailed Description
Example 1
Referring to fig. 1 and 2, the entire pedicle extension device is composed of a core bar 1 and a front nail body 2 and a rear nail body 3 which are respectively screwed at both ends of the core bar 1, wherein the outer surfaces of the front nail body and the rear nail body are provided with self-tapping threads with the same pitch.
Referring to fig. 3 in combination with fig. 2 and fig. 1, in the head of the front nail body 2 opposite to the rear nail body 3, the head of the front nail body 2 is provided with an inner hexagon 4, and the head of the rear nail body 3 is provided with an outer hexagon 5 matched with the inner hexagon arranged at the head of the front nail body 2. The inner hexagon 4 and the outer hexagon 5 form an inserting structure between the front nail body 2 and the rear nail body 3, a pedicle screw is formed after the front nail body 2 and the rear nail body 3 are inserted and connected, and self-tapping threads arranged on the outer surfaces of the front nail body and the rear nail body are continuous (see figure 1).
Referring to fig. 3, a threaded hole 6 is formed along the axial lead of the pedicle screw formed after the front screw body 2 and the rear screw body 3 are connected in an inserting manner, the screwing directions of internal threads in the threaded hole 6 are the same, and the pitch of the internal threads in the rear screw body 3 is larger than that of the internal threads in the front screw body 2.
Referring to fig. 4, two ends of the core bar 1 are respectively provided with external threads matched with the internal threads arranged in the front nail body 2 and the rear nail body 3, and the middle part is a polished rod; the length of the core bar 1 is equal to the sum of the length of a pedicle screw formed by splicing the front nail body 2 and the rear nail body 3 and the preset extension length of the pedicle.
Referring to fig. 5 and 6 in conjunction with fig. 1, the improved pedicle extension device of the present invention is installed as follows:
(1) drilling a guide hole on the pedicle 11 of the lumbar vertebra 10 needing to be extended by using a pistol drill;
(2) mounting the front nail body 2 and the rear nail body 3 on the core rod 1, enabling the front nail body 2 and the rear nail body 3 to be tightly plugged together (as shown in the state of figure 1) to form a pedicle extension device 9, and then tapping the whole device into the lumbar vertebra 10 along the guide hole (as shown in figure 5);
(3) the pedicle of vertebral arch 11 is broken, and the core rod 1 is screwed to be retracted into the nail body 3 and the heads of the two are ensured to be flush (see figure 6).
Example 2
Referring to fig. 7 and 8, the insertion structure between the front nail body 2 and the rear nail body 3 in the present embodiment is different, and the other structure is the same as that of example 1. In this embodiment, the insertion structure is composed of a sector claw 7 and a sector groove 8 which are alternately arranged on the end surface of the front nail body 2 opposite to the rear nail body 3, wherein the sector claw 7 and the sector groove 8 are both in sector shapes with the same shape and the same area. After the front nail body 2 and the rear nail body 3 are spliced together, self-tapping threads arranged on the outer surfaces of the front nail body and the rear nail body are separated and broken in the length interval of the fan-shaped claw 7 for the same spiral thread.
Claims (3)
1. An improved pedicle extension device comprises a core rod, a front nail body and a rear nail body which are respectively in threaded connection with two ends of the core rod, wherein self-tapping threads with the same thread pitch are arranged on the outer surfaces of the front nail body and the rear nail body; the pedicle screw is provided with a threaded hole along the axial lead, the turning directions of internal threads in the threaded hole are the same, and the pitch of the internal threads in the rear screw body is greater than that in the front screw body; the two ends of the core rod are respectively provided with external threads matched with the internal threads arranged in the front nail body and the rear nail body, the middle part of the core rod is a polished rod, and the length of the core rod is equal to the sum of the length of a pedicle screw formed by splicing the front nail body and the rear nail body and the preset and extended length of the pedicle screw.
2. The improved pedicle extension device according to claim 1, wherein the insertion structure is: in the heads of the front nail body and the rear nail body, one head is provided with an outer hexagon, and the other head is provided with an inner hexagon matched with the outer hexagon; and after the front nail body and the rear nail body are spliced together, self-tapping threads arranged on the outer surfaces of the front nail body and the rear nail body are continuous.
3. The improved pedicle extension device according to claim 1, wherein the insertion structure is: sector claws and sector grooves are respectively arranged on the opposite end surfaces of the front nail body and the rear nail body in a staggered manner, and the cross sections of the sector claws and the sector grooves are sectors with the same shape and the same area; and after the front nail body and the rear nail body are spliced together, self-tapping threads arranged on the outer surfaces of the front nail body and the rear nail body are separated from each other by the same spiral thread in the length interval of the fan-shaped claw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320764621.8U CN203564323U (en) | 2013-11-27 | 2013-11-27 | Improved vertebral pedicle extending device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320764621.8U CN203564323U (en) | 2013-11-27 | 2013-11-27 | Improved vertebral pedicle extending device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203564323U true CN203564323U (en) | 2014-04-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320764621.8U Expired - Lifetime CN203564323U (en) | 2013-11-27 | 2013-11-27 | Improved vertebral pedicle extending device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203564323U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104887300A (en) * | 2015-05-26 | 2015-09-09 | 王欢 | Split lengthening pedicle screw |
| CN116672607A (en) * | 2023-07-03 | 2023-09-01 | 北京微脊医疗科技有限公司 | Implantable electrical stimulator, implantation method and electrical stimulation device |
-
2013
- 2013-11-27 CN CN201320764621.8U patent/CN203564323U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104887300A (en) * | 2015-05-26 | 2015-09-09 | 王欢 | Split lengthening pedicle screw |
| CN116672607A (en) * | 2023-07-03 | 2023-09-01 | 北京微脊医疗科技有限公司 | Implantable electrical stimulator, implantation method and electrical stimulation device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |
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| CX01 | Expiry of patent term |