CN101856265A - Extractor of orthopedic slipped screws - Google Patents
Extractor of orthopedic slipped screws Download PDFInfo
- Publication number
- CN101856265A CN101856265A CN201010196507A CN201010196507A CN101856265A CN 101856265 A CN101856265 A CN 101856265A CN 201010196507 A CN201010196507 A CN 201010196507A CN 201010196507 A CN201010196507 A CN 201010196507A CN 101856265 A CN101856265 A CN 101856265A
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- CN
- China
- Prior art keywords
- extractor
- cutter head
- mobile jib
- orthopedic
- slipped screws
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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.)
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Abstract
The invention provides an extractor of orthopedic slipped screws, relating to an orthopedic surgical instrument and mainly comprising a screwdriver body and a main rod sleeve. The extractor of orthopedic slipped screws is characterized in that the lower end of the screwdriver body is arranged in the main rod sleeve, and the upper end of the screwdriver body is a conical hollow cutter head provided with a longitudinal notch; and a propelling ring provided with a conical head rod is installed outside the main rod sleeve, and the upper end of the conical head rod is designed into a conical shape corresponding to the hollow cutter head and extends into the hollow cutter head so that the cutter head is expanded. The invention can be used for extracting screws which have larger resistance and can not be screwed by the traditional screwdriver, especially slipped screws.
Description
Technical field
The present invention relates to bone surgery set, particularly a kind of apparatus that is used to take out hold-down screw.
Background technology
Blade plate and screw fixedly fracture have become current internal fixation mode commonly used, and at present, interior hexagon screw is the most frequently used screw of orthopaedics.Need after the union of fracture blade plate screw in the body is taken out.Deformation takes place because screw bears big stress regular meeting in vivo; cause screw frictional resistance to increase greatly; the back-out screw is extremely required great effort and regular meeting screw occurs by stubborn sliding situation; particularly recent years is along with the popularization of Minimally Invasive Surgical Technology (MIS) at orthopaedics; the LISS system; the LCP system is used widely in fracture fixation; between the nail hole of this type of blade plate and its supporting lock screw nail tail fine thread locking is arranged; in union of fracture future trouble limb heavy burden activity; the easier screw thread generation deformation between the lock hole on screw nail tail and the blade plate that causes because screw meets with stresses; make the back-out of screw difficult more, occur twisting the probability of sliding screw during powerful the rotation and increase greatly." screw stripped thread " can obviously strengthen and take out difficulty, prolongs operating time, increases and infects probability, failure occurs taking out even causes severe complication such as refracture.
Summary of the invention
The object of the present invention is to provide a kind of screwing to take out the extractor of orthopedic slipped screws of stripped thread allen screw.
The present invention is achieved in that
Extractor of orthopedic slipped screws mainly comprises screwdriver body and mobile jib sleeve, it is characterized in that: described screwdriver body lower end is arranged in the mobile jib sleeve, and the upper end is the interior empty cutter head of taper that has vertical notch; Described mobile jib sleeve is equipped with a pushing ring by external screw thread, also is provided with a conehead bar on the pushing ring, and this conehead bar upper end is designed to and the corresponding taper of interior empty cutter head, and stretches in the interior empty cutter head.
After the present invention adopts said structure,,, can take out stripped thread orthopaedics hold-down screw by empty cutter head in the inflatable screw and conehead bar according to the specification of stripped thread soket head cap screw.
The present invention has following advantage:
1. empty cutter head is slight taper in, the soket head cap screw of suitable all size stripped thread;
2. base combines by ball-and-socket with the mobile jib sleeve, prevents that effectively the mobile jib sleeve from waving the generation of phenomenon, increases the success rate of screwing taking-up;
3. handle has increased rotary arm, and is laborsaving, and dynamics is even, processing ease;
The screw of can unscrew like a cork 4. that those resistances are big, conventional screw-driver in order can not turn, the particularly screw of stripped thread;
5. can simplify this type of operation technique difficulty, reduce postoperative complication.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention, and Fig. 2 is a user mode reference diagram of the present invention.
In the accompanying drawing, 1 is that screwdriver body, 2 is that mobile jib sleeve, 3 is that cutter head, 4 is that pushing ring, 5 is that conehead bar, 6 is that ball-and-socket, 7 is that base, 8 is that handle ring, 9 is that handle, 10 is that retainer ring, 11 is a pin.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated.
The present invention is an extractor of orthopedic slipped screws, as shown in Figure 1, mainly is made up of screwdriver body 1, mobile jib sleeve 2, conehead bar 5 and flat base 7.The bottom of described mobile jib sleeve 2 is provided with a spherosome, and mobile jib sleeve 2 tops are provided with notch, and its outside is provided with external screw thread, and inner face is provided with reverse female thread.Have a hemispherical ball-and-socket 6 on the described base 7, be used for cooperating, both can guarantee the rotation of mobile jib sleeve 2, can prevent to rotate off normal again with the spherosome of mobile jib sleeve 2.Also be set with a handle ring 8 on the described mobile jib sleeve 2, be installed with handle 9 on this handle ring 8.Screwdriver body 1 lower end is by the screw-internal thread fit of helicitic texture and mobile jib sleeve 2, and spinning is in mobile jib sleeve 2.The upper end of screwdriver body 1 is the interior empty cutter head 3 that has centre bore, has vertical notch on the interior empty cutter head 3, forms inflatable cutter head 3; And be designed to slight taper, with the shape of soket head cap screw nail tail groove behind the suitable stripped thread, its taper should be greater than interior empty cutter head 3 centre bores.According to orthopaedics soket head cap screw specification commonly used, interior empty cutter head 3 can be divided into two kinds of specifications of 3.5mm, 2.5mm, and cutter head 3 is divided into two kinds, and a kind of is common hexangle type: the Cross-section Design of interior empty cutter head 3 is a hexagon; A kind of is anti-screw tap type: interior empty cutter head 3 is outside equipped with anti-screw tap screw thread.Mobile jib sleeve 2 is equipped with a pushing ring 4 by external screw thread, also is provided with a conehead bar 5 on the pushing ring 4, and these conehead bar 5 upper ends are designed to and interior empty cutter head 3 corresponding tapers, and stretches in the interior empty cutter head 3.Retainer ring 10 of pushing ring 4 suits, retainer ring 10 is provided with pin 11; Described mobile jib sleeve 2 is provided with and pin 11 corresponding notches.Conehead bar 5 is located in the pushing ring 4, and can be flexible with being rotated in the mobile jib sleeve 2 of pushing ring 4.
During use, rotation pushing ring 4 is retracted into conehead bar 5 in the mobile jib sleeve 2, borrows left-hand thread to be sleeved on mobile jib sleeve 2 tops screwdriver body 1, forms extractor of orthopedic slipped screws.Take out the slipped screws method: empty cutter head 3 in expandable is embedded in the groove of slipped screws nail tail, in pushing conehead bar 5, cause rotation pushing ring 4 driver bit 3 to expand in the empty cutter head 3, expansible driver bit 3 with twist sliding screw nail tail groove closely chimeric after, the handle 9 of screwing mobile jib sleeve 2 again can be back-outed and take out the screw of stripped thread.
Claims (7)
1. extractor of orthopedic slipped screws mainly comprises screwdriver body (1) and mobile jib sleeve (2), it is characterized in that: described screwdriver body (1) lower end is arranged in the mobile jib sleeve (2), and the upper end is the interior empty cutter head (3) of taper that has vertical notch; Described mobile jib sleeve (2) is equipped with a pushing ring (4) by external screw thread, also is provided with a conehead bar (5) on the pushing ring (4), and this conehead bar (5) upper end is designed to and the corresponding taper of interior empty cutter head (3), and stretches in the interior empty cutter head (3).
2. extractor of orthopedic slipped screws according to claim 1 is characterized in that: described screwdriver body (1) is arranged in the mobile jib sleeve (2) by helicitic texture.
3. extractor of orthopedic slipped screws according to claim 1 and 2 is characterized in that: also include a base (7) that has ball-and-socket (6), the bottom of described mobile jib sleeve (2) is provided with a spherosome that cooperates with described ball-and-socket (6).
4. extractor of orthopedic slipped screws according to claim 3 is characterized in that: also be set with a handle ring (8) on the described mobile jib sleeve (2), be installed with handle (9) on this handle ring (8).
5. extractor of orthopedic slipped screws according to claim 4 is characterized in that: described pushing ring (a 4) retainer ring of suit (10), and retainer ring (10) is provided with pin (11); Described mobile jib sleeve (2) is provided with and the corresponding notch of pin (11).
6. extractor of orthopedic slipped screws according to claim 5 is characterized in that: the Cross-section Design of empty cutter head (3) is a hexangle type in described.
7. extractor of orthopedic slipped screws according to claim 5 is characterized in that: empty cutter head (3) is outside equipped with anti-screw tap screw thread in described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010196507A CN101856265A (en) | 2010-06-02 | 2010-06-02 | Extractor of orthopedic slipped screws |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010196507A CN101856265A (en) | 2010-06-02 | 2010-06-02 | Extractor of orthopedic slipped screws |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101856265A true CN101856265A (en) | 2010-10-13 |
Family
ID=42942581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010196507A Pending CN101856265A (en) | 2010-06-02 | 2010-06-02 | Extractor of orthopedic slipped screws |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101856265A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104434295A (en) * | 2014-11-07 | 2015-03-25 | 中国人民解放军第四军医大学 | Special screw driver for taking orthopaedic internal fixed slip screw |
| CN112237472A (en) * | 2020-10-30 | 2021-01-19 | 温州医科大学附属第二医院、温州医科大学附属育英儿童医院 | Orthopedic internal fixation nail puller capable of preventing thread slipping and saving labor |
-
2010
- 2010-06-02 CN CN201010196507A patent/CN101856265A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104434295A (en) * | 2014-11-07 | 2015-03-25 | 中国人民解放军第四军医大学 | Special screw driver for taking orthopaedic internal fixed slip screw |
| CN112237472A (en) * | 2020-10-30 | 2021-01-19 | 温州医科大学附属第二医院、温州医科大学附属育英儿童医院 | Orthopedic internal fixation nail puller capable of preventing thread slipping and saving labor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20101013 |