CN204410946U - A kind of elastic vertebra dynamic pedicle screw system - Google Patents
A kind of elastic vertebra dynamic pedicle screw system Download PDFInfo
- Publication number
- CN204410946U CN204410946U CN201520023458.9U CN201520023458U CN204410946U CN 204410946 U CN204410946 U CN 204410946U CN 201520023458 U CN201520023458 U CN 201520023458U CN 204410946 U CN204410946 U CN 204410946U
- Authority
- CN
- China
- Prior art keywords
- pitman
- nail seat
- pedicle screw
- shaped opening
- screw
- Prior art date
- 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.)
- Active
Links
Abstract
The utility model discloses a kind of elastic vertebra dynamic pedicle screw system, comprise pitman and several pedicle screws, described pedicle screw comprises lock nut, nail seat and screw body, wherein, described nail seat top is provided with female thread and has 2 U-shaped openings, U-shaped opening forms the space holding pitman, and the below of U-shaped opening has thread-shaped hole, and the below of U-shaped opening presents spring-like; Nail seat inside is cylindrical cavity, and the below of cylindrical cavity is provided with an interior hexagonal counterbore; Described screw body is positioned at below thread-shaped hole; Described pitman is placed in the U-shaped opening at the nail seat top of several pedicle screws, and lock nut is screwed into the female thread at nail seat top.The pedicle screw tail end of native system can bend and compress as spring, realizes dynamically fixing, and pitman pre-bending is convenient, and pedicle screw bears little, the two screw of moment or the accessible application of many screws.
Description
Technical field
The present invention relates to a kind of medical surgery apparatus, be specifically related to a kind of spinal column internal fixation device, this holder is applicable to the Minimally Invasive Surgery of internal fixation of spine.
Background technology
The spinal internal fixation system applied clinically is generally made up of two parts, the pedicle screw namely playing anchorage effect and the connecting elements such as rod iron, steel plate playing bridge joint effect.The operation principle of spinal internal fixation system is: insert pedicle screw respectively the upper vertebral body of targeted vertebral body and the next vertebral body, be fixed by connecting elements between pedicle screw, make upper and lower vertebral body become as a whole, thus substitute by connector the motive power that original diseased region bears spinal column.The spinal internal fixation system of current classics is connecting elements is nail rod or steel plate, forms strong fixing, has higher stiffness, can not relative motion between the upper vertebral body be fixed and the next vertebral body.This fixing problem brought is: because described hold-down bars or fixing head are rigidity, the interpyramidal stress in upper bottom supports primarily of this rod or plate, bears, the stress that sclerotin newborn in two interpyramidal spaces bears is less, easily cause osteoporosis, fracture delayed union is not even healed.When after removal inner fixing device, can again subside after vertebral body load.Strong fixing meeting causes neighbouring section stress to increase in addition, disc degradation etc. between acceleration neighbouring section.
In order to solve fixing rod iron and the above-mentioned technological deficiency of pedicle screw, make, between the upper vertebral body of fixing and the next vertebral body, there is certain mobility, Authorization Notice No. is a kind of lumbar vertebral posterior dynamic fixation device disclosed in CN 202458646 U, adopt helical spring pitman to replace generic connectivity rod, helical spring pitman has certain deformation performance; In addition, publication number is dynamic fixing system for lumbar vertebrae disclosed in CN 102362816 A, and adopt the dynamic rod having helical pitch screw thread to replace generic connectivity rod, the dynamic rod having helical pitch screw thread has certain deformation performance.But, helical spring pitman and the dynamic rod having helical pitch screw thread, doctor is in operation process, and both discoveries all have following three technological deficiencies:
1, according to the Distance geometry radian at the spinal column position of pathological changes, pitman in most cases all needs to carry out low-angle pre-bending, the central angle of the pitman after pre-bending is generally at 0-10 °, helical spring pitman and the dynamic rod having helical pitch screw thread, when pre-bending due to its elastic-restoring force, still revert back to straight rod.
2, pedicle screw system is after implant into body, human body is in active procedure, and helical spring pitman needs to bear motive power, from moment formula M=FL with the dynamic rod having helical pitch screw thread, when directed force F is certain, distance L is larger, and moment M is larger, and the distance of namely pitman generation stress deformation is too large, the moment of bearing is too large, pitman easily fractures, once fracture, then causes secondary injury.
3, before implantation pedicle screw, need according to the physiologic radian of patient's vertebra or the radian that reaches in advance pressurizeing between vertebral body or strutting, this just causes the discordance of intervertebral distance, that is the distance between the pedicle screw implanted is not equidistant, and the distance between the pedicle screw of implantation cannot be determined before the surgery.When the multiple spinal injury of patient, need to implant multiple pedicle screw, then adopt pitman that multiple pedicle screw is linked to be an entirety, and the helical spring of helical spring pitman may stop the position of pedicle screw, same, the helical pitch threaded portion having the dynamic rod of helical pitch screw thread also may stop and causes pedicle screw system to use in the position of pedicle screw.
Summary of the invention
The deficiency that this utility model exists to overcome above prior art, provide a kind of elastic vertebra dynamic pedicle screw system, the pedicle screw tail end of native system can bend and compress as spring, realize dynamically fixing, and pitman pre-bending is convenient, pedicle screw bears little, the two screw of moment or the accessible application of many screws.
The purpose of this utility model is realized by following technical scheme: this elastic vertebra dynamic pedicle screw system, and comprise pitman and several pedicle screws, described pedicle screw comprises lock nut, nail seat and screw body, wherein,
Described nail seat top is provided with female thread and has 2 U-shaped openings, and U-shaped opening forms the space holding pitman, and the below of U-shaped opening has thread-shaped hole, and the below of U-shaped opening presents spring-like; Nail seat inside is cylindrical cavity, and the below of cylindrical cavity is provided with an interior hexagonal counterbore;
Described screw body is positioned at below thread-shaped hole;
Described pitman is placed in the U-shaped opening at the nail seat top of several pedicle screws, and lock nut is screwed into the female thread at nail seat top.
This utility model has following advantage relative to prior art:
1, the pitman of native system, without the need to design flexibility structure, easily according to the Distance geometry radian at the spinal column position of pathological changes, can carry out the low-angle pre-bending of central angle 0-10 °.
2, the pedicle screw of native system, the spring-like position of nail seat can carry out bending and compressing relative to nail rod, therefore, pedicle screw system is after implant into body, and the active force to screw system that human body produces in active procedure, just can be born by the elastic deformation of nail seat, compared to the distortion of pitman, distance L shortens, and moment M is directly proportional and diminishes, and pedicle screw is frangibility not.
3, the pitman of native system is level and smooth pole, there is no the concaveconvex structures such as elastic construction, in operation process, no matter the vertebra of pathological changes needs to implant how many pedicle screws, distance no matter between pedicle screw is either large or small, pitman can put into the U-shaped opening at nail seat top smoothly, and is locked by lock nut, and pitman is linked to be a firm entirety several pedicle screws.
Accompanying drawing explanation
Fig. 1-Fig. 3 is the structure chart of the elastic vertebra dynamic pedicle screw system of detailed description of the invention.Wherein, Fig. 1 is assembly drawing, and Fig. 2 is the structure chart of pedicle screw, and Fig. 3 is the structure chart of another angle of Fig. 2.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Elastic vertebra dynamic pedicle screw system as shown in Figure 1-Figure 3, comprise pitman 1 and 2 pedicle screws, pedicle screw comprises lock nut 2, nail seat 3 and screw body 4, wherein,
Nail seat 3 top is provided with female thread 5 and has 2 U-shaped openings 6, and U-shaped opening 6 forms the space holding pitman 1, and the below of U-shaped opening 6 has thread-shaped hole 7, and the below of U-shaped opening 6 presents spring-like; Nail seat 3 inside is cylindrical cavity, and the below of cylindrical cavity is provided with an interior hexagonal counterbore 8, and interior hexagonal counterbore 8 is convenient to utilize interior hex tool to insert in vertebral body by pedicle screw; Screw body 4 is positioned at below thread-shaped hole 7; Pitman 1 is placed in the U-shaped opening 6 at nail seat 3 top of two pedicle screws, and lock nut 2 is screwed into the female thread 5 at nail seat 3 top.
The assembling of this pedicle screw system and use procedure are:
Each pedicle screw is inserted each vertebral body, the U-shaped opening at each pedicle screw top will remain in same straight line, according to patient's vertebra radian, pre-bending is carried out to pitman, then pitman is put into each U-shaped opening, be screwed into lock nut, (in Fig. 1, pedicle screw is 2 as shown in Figure 1, when pedicle screw is multiple, assembling process is identical with use procedure), this pedicle screw system permission patient fixedly hinders vertebra and carries out the fine motion activities such as certain anterior flexion and rear stretching lateral bending rotation.
Claims (1)
1. an elastic vertebra dynamic pedicle screw system, comprises pitman and several pedicle screws, it is characterized in that: described pedicle screw comprises lock nut, nail seat and screw body, wherein,
Described nail seat top is provided with female thread and has 2 U-shaped openings, and U-shaped opening forms the space holding pitman, and the below of U-shaped opening has thread-shaped hole, and the below of U-shaped opening presents spring-like; Nail seat inside is cylindrical cavity, and the below of cylindrical cavity is provided with an interior hexagonal counterbore;
Described screw body is positioned at below thread-shaped hole;
Described pitman is placed in the U-shaped opening at the nail seat top of several pedicle screws, and lock nut is screwed into the female thread at nail seat top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520023458.9U CN204410946U (en) | 2015-01-14 | 2015-01-14 | A kind of elastic vertebra dynamic pedicle screw system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520023458.9U CN204410946U (en) | 2015-01-14 | 2015-01-14 | A kind of elastic vertebra dynamic pedicle screw system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204410946U true CN204410946U (en) | 2015-06-24 |
Family
ID=53461367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520023458.9U Active CN204410946U (en) | 2015-01-14 | 2015-01-14 | A kind of elastic vertebra dynamic pedicle screw system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204410946U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106264699A (en) * | 2016-08-28 | 2017-01-04 | 李海洋 | Pedicle screw |
| CN109893233A (en) * | 2019-04-03 | 2019-06-18 | 常熟市第二人民医院 | Pedicle screw-rod structure |
| CN112754634A (en) * | 2021-02-10 | 2021-05-07 | 贺新宁 | Intervertebral space elasticity distraction device |
-
2015
- 2015-01-14 CN CN201520023458.9U patent/CN204410946U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106264699A (en) * | 2016-08-28 | 2017-01-04 | 李海洋 | Pedicle screw |
| CN109893233A (en) * | 2019-04-03 | 2019-06-18 | 常熟市第二人民医院 | Pedicle screw-rod structure |
| CN112754634A (en) * | 2021-02-10 | 2021-05-07 | 贺新宁 | Intervertebral space elasticity distraction device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102133132B (en) | Dynamic screw implant for pedicle of vertebral arch | |
| US8652174B2 (en) | Expandable interspinous process spacer | |
| US9668783B2 (en) | Devices and method for treatment of spondylotic disease | |
| CN201977917U (en) | Non-fusion elastic rod internal fixing system | |
| US10695189B2 (en) | Interspinous omnidirectional dynamic stabilization device | |
| AU2014248622A1 (en) | Pedicle screw with reverse spiral cut and methods thereof | |
| CN204410946U (en) | A kind of elastic vertebra dynamic pedicle screw system | |
| CN103860246A (en) | Vertebral pedicle screw and thoracolumbar spine anterior internal fixing system | |
| CN206044709U (en) | A kind of automatically reset pedicle nail | |
| CN204410947U (en) | A kind of can the vertebra dynamic pedicle screw system of fine motion | |
| CN104323846A (en) | Universal elastic fixed rod | |
| CN201631368U (en) | Hidden reset pedicle screw with fractured surface | |
| CN203815664U (en) | Inelastic and elastic combined intervertebral support device | |
| CN204600645U (en) | A kind of anterior cervical vertebrae internal fixation steel plate | |
| CN203564323U (en) | Improved vertebral pedicle extending device | |
| CN204246232U (en) | A kind of universal flexible fastening rod | |
| CN203898415U (en) | Interspinous universal stabilizer | |
| CN203988323U (en) | A kind of occipital plate and surgical fixation system | |
| CN205903296U (en) | Basin damage is with internal fixation device that resets at bottom of waist | |
| CN202161395U (en) | Elastic orthopedic rod used for internal fixation of spine | |
| CN109549696B (en) | Adjustable double-groove spine internal fixation device and bone screw | |
| CN110893130A (en) | Intervertebral fusion cage | |
| KR100997811B1 (en) | A fixing device of laminoplasty in spinal column | |
| CN204814138U (en) | Chest lumbar vertebrae way of escape flexible fixation system | |
| CN211381999U (en) | Intervertebral fusion cage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |