CN203898418U - Pedicle screw with composite thread - Google Patents
Pedicle screw with composite thread Download PDFInfo
- Publication number
- CN203898418U CN203898418U CN201420120615.3U CN201420120615U CN203898418U CN 203898418 U CN203898418 U CN 203898418U CN 201420120615 U CN201420120615 U CN 201420120615U CN 203898418 U CN203898418 U CN 203898418U
- Authority
- CN
- China
- Prior art keywords
- thread
- double
- pitch
- screw
- pedicle
- 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.)
- Expired - Fee Related
Links
- 239000002131 composite material Substances 0.000 title abstract 2
- 150000001875 compounds Chemical class 0.000 claims description 14
- 210000000988 bone and bone Anatomy 0.000 abstract description 27
- 230000001054 cortical effect Effects 0.000 abstract description 8
- 230000006378 damage Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001009 osteoporotic effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
- A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
Abstract
The utility model discloses a pedicle screw with a composite thread. The pedicle screw comprises a screw body and the thread arranged on the body, wherein the thread is designed into two sections with equal lengths, the front-half section is a single-line thread, the rear-half section is a double-line thread, and the screw pitch of the single-line thread is more than that of the double-line thread. The pedicle screw disclosed by the utility model has the advantages that the characteristics of two threads are integrated, i.e., the screw pitch of the double-line thread at the rear section is less, and denser and lower teeth can enhance the strength of the double-line thread, so that not only is the fixation with the external cortical bone well, but also the fracture is not easy; the screw pitch of the single-line thread at the front section is large, the bone gripping amount can be furthest increased after thinner and higher teeth are screwed into cancellous bones and then the screw is stabilized, so that the whole pedicle screw can be better fixed in the bone, the success rate of the internal fixation operation is ensured and the risk for causing damage to a patient is reduced.
Description
Technical field
This utility model relates to operating theater instruments, more particularly, relates to a kind of pedicle nail of compound thread.
Background technology
Pedicle of vertebral arch is a part for vertebral arch, arises from vertebral body upper back, short and thick, rearward projection vertical with vertebral body direction, and its profile is arc, merges with vertebral body, articular process and vertebral plate, and pedicle of vertebral arch is the ingredient that forms intervertebral foramina.
Pedicle of vertebral arch is also to connect bone structure the strongest between vertebral body and vertebral plate, carries out screw fixedly can be reconstruction spinal stabilization reliable mechanical foundation is provided by pedicle of vertebral arch.
At present, common pedicle nail generally has two kinds, and a kind of its screw thread is all single thread, and another kind of its screw thread is all double thread.Because the outside of pedicle of vertebral arch is cortical bone, inside is spongy bone, and cortical bone is comparatively hard, and spongy bone is comparatively soft.If there are osteoporotic words, its spongy bone is more soft.If adopt single threaded pedicle nail to carry out pedicle of vertebral arch internal fixation operation, because single threaded pitch is larger, thread is higher thinner, therefore when screwing in, it can grasp spongy bone preferably, but not good with the hard cortical bone in outside ground fixed effect, and easily ruptures; If adopt the pedicle nail of double thread to carry out pedicle of vertebral arch internal fixation operation, because the pitch of double thread is less, and thread is lower thicker, therefore when screwing in, although it can fix with outside cortical bone preferably, but cannot grasp well inner spongy bone, cause nail easily loosening, stability is not good.
Just so, when adopting the extensive use clinically of above-mentioned two kinds of pedicle nails, often there will be the complication such as pedicle nail becomes flexible, extracts and fractures, thereby cause the failure of internal fixation operation, and patient is caused to larger injury.Therefore, the constant intensity of pedicle nail is had higher requirement.
Utility model content
For the above-mentioned shortcoming existing in prior art, the purpose of this utility model is to provide a kind of pedicle nail of compound thread, can take into account two kinds of screw thread features, thereby the integral body of pedicle nail can be fixed in pedicle of vertebral arch better.
For achieving the above object, this utility model adopts following technical scheme:
The pedicle nail of this compound thread, comprises nail body and is located at the screw thread on body, described screw thread design is two sections of length half and half, and first half section is single thread, and the second half section is double thread, and single threaded pitch is greater than the pitch of double thread.
It is the variable-diameter structure of changing from small to big that the afterbody of described whole screw thread from single threaded head to double thread is footpath, the end, and the external diameter of single thread and double thread is identical.
The twice of the pitch that described single threaded pitch is double thread.
Described single threaded pitch is 3.6mm, and the pitch of double thread is 1.8mm.
Described single thread and the external diameter of double thread are all 5.5mm or 6.0mm.
Described screw thread overall length is 30mm, 35mm, 40mm, 45mm, 50mm or 55mm.
The head of described nail body is also provided with pair of notches.
In technique scheme, the pedicle nail of compound thread of the present utility model comprises nail body and be located at the screw thread on body, and screw thread design is two sections of length half and half, and first half section is single thread, second half section is double thread, and single threaded pitch is greater than the pitch of double thread.This pedicle nail has been taken into account two kinds of screw thread features, and the pitch of back segment double thread is little, and closeer lower tooth can strengthen the intensity of double thread, not only can be well fixing with outer cortical bone, but also frangibility not; And the single threaded pitch of leading portion is large, thinner higher tooth can increase to greatest extent the bone amount that grasps after screwing in spongy bone, stablize nail, thereby the integral body of pedicle nail can be better fixed in bone, guarantee the success rate of internal fixation operation, reduced the risk that patient is damaged.
Accompanying drawing explanation
Fig. 1 is an axonometric chart of the pedicle nail of compound thread of the present utility model;
Fig. 2 is another axonometric chart of the pedicle nail of compound thread of the present utility model.
The specific embodiment
Below in conjunction with drawings and Examples, further illustrate the technical solution of the utility model.
Refer to shown in Fig. 1～Fig. 2, the pedicle nail of compound thread of the present utility model compared with prior art, equally also comprise nail body 1 and be located at the screw thread on body 1, difference is, this screw thread design is two sections of length half and half, first half section is single thread 2, and the second half section is double thread 3, and the pitch of single thread 2 is greater than the pitch of double thread 3.So, the tooth of single thread 2 is thinner, can capture more spongy bone amount, and the tooth of double thread 3 is closeer, can improve hardness, and fixedly time, frangibility, more not firm with cortical bone.
Preferably, the pitch of described single thread 2 is the twice of the pitch of double thread 3.And through repeatedly repeatedly calculating and verifying, single threaded pitch is designed to 3.6mm, the pitch of double thread is designed to 1.8mm.
As an embodiment, it is the variable-diameter structure of changing from small to big that the afterbody of the whole screw thread of this pedicle nail from the head of single thread 2 to double thread 3 is footpath, the end, and single thread 2 is identical with the external diameter of double thread 3.So, make the tooth depth of double thread 3 lower, more contribute to improve its intensity, more not frangibility; And making the tooth depth of single thread 2 higher, the space that grasps bone is larger, can more contribute to improve it and grab bone amount, fixing more effective with inner spongy bone.
Described single thread 2 and the external diameter of double thread 3 can be all 5.5mm or these two kinds of specifications of 6.0mm.The screw thread overall length of this pedicle nail is designed to 30mm, 35mm, 40mm, 45mm, 50mm or 55mm, to meet the operation demand to different patients.
In addition, the head both sides of described nail body 1 are also respectively equipped with a symmetrical otch 4, by otch 4 designs at this place, can be more convenient for cutting in bone.
In sum, adopt pedicle nail of the present utility model, due to the pitch at single thread 2 places of its first half section obviously large, tooth is obviously higher, thinner, and the pitch of double thread 3 is relatively little, tooth is lower thicker.So, in when operation, the pitch of back segment double thread 3 is little, and lower tooth can effectively increase its intensity, the cortical bone with comparatively hard carry out well fixing in, difficult fracture; And the pitch of leading portion single thread 2 is large, higher tooth can maximum grasp more soft spongy bone, to stablize nail, thereby whole pedicle nail can be better fixed in bone, guarantee the success rate of internal fixation operation, reduced the risk that patient is damaged.
Those of ordinary skill in this technology will be appreciated that, above embodiment is only for this utility model is described, and be not used as restriction of the present utility model, as long as within the scope of connotation of the present utility model, to the variation of the above embodiment, modification, all will drop within the scope of claims of the present utility model.
Claims (6)
1. a pedicle nail for compound thread, comprises nail body and is located at the screw thread on body, it is characterized in that:
Described screw thread design is two sections of length half and half, and first half section is single thread, and the second half section is double thread, and single threaded pitch is greater than the pitch of double thread;
It is the variable-diameter structure of changing from small to big that the afterbody of described whole screw thread from single threaded head to double thread is footpath, the end, and the external diameter of single thread and double thread is identical.
2. the pedicle nail of compound thread as claimed in claim 1, is characterized in that:
The twice of the pitch that described single threaded pitch is double thread.
3. the pedicle nail of compound thread as claimed in claim 2, is characterized in that:
Described single threaded pitch is 3.6mm, and the pitch of double thread is 1.8mm.
4. the pedicle nail of compound thread as claimed in claim 1, is characterized in that:
Described single thread and the external diameter of double thread are all 5.5mm or 6.0mm.
5. the pedicle nail of compound thread as claimed in claim 1, is characterized in that:
Described screw thread overall length is 30mm, 35mm, 40mm, 45mm, 50mm or 55mm.
6. the pedicle nail of compound thread as claimed in claim 1, is characterized in that:
The head of described nail body is also provided with pair of notches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420120615.3U CN203898418U (en) | 2014-03-18 | 2014-03-18 | Pedicle screw with composite thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420120615.3U CN203898418U (en) | 2014-03-18 | 2014-03-18 | Pedicle screw with composite thread |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203898418U true CN203898418U (en) | 2014-10-29 |
Family
ID=51772722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420120615.3U Expired - Fee Related CN203898418U (en) | 2014-03-18 | 2014-03-18 | Pedicle screw with composite thread |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203898418U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105640638A (en) * | 2014-11-13 | 2016-06-08 | 无锡市闻泰百得医疗器械有限公司 | Pedicle screw structure |
| CN109589163A (en) * | 2019-01-25 | 2019-04-09 | 江苏嘉斯康医疗科技有限公司 | A kind of double thread centrum nail |
| CN109620382A (en) * | 2019-01-18 | 2019-04-16 | 贝尔泰克医疗器械江苏有限公司 | A kind of pedicle screw |
| CN111839701A (en) * | 2020-07-13 | 2020-10-30 | 北京市春立正达医疗器械股份有限公司 | Novel pedicle screw and implantation method thereof |
-
2014
- 2014-03-18 CN CN201420120615.3U patent/CN203898418U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105640638A (en) * | 2014-11-13 | 2016-06-08 | 无锡市闻泰百得医疗器械有限公司 | Pedicle screw structure |
| CN109620382A (en) * | 2019-01-18 | 2019-04-16 | 贝尔泰克医疗器械江苏有限公司 | A kind of pedicle screw |
| CN109589163A (en) * | 2019-01-25 | 2019-04-09 | 江苏嘉斯康医疗科技有限公司 | A kind of double thread centrum nail |
| CN111839701A (en) * | 2020-07-13 | 2020-10-30 | 北京市春立正达医疗器械股份有限公司 | Novel pedicle screw and implantation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 |