CN203736299U - Screw extracting assembly - Google Patents
Screw extracting assembly Download PDFInfo
- Publication number
- CN203736299U CN203736299U CN201420052784.8U CN201420052784U CN203736299U CN 203736299 U CN203736299 U CN 203736299U CN 201420052784 U CN201420052784 U CN 201420052784U CN 203736299 U CN203736299 U CN 203736299U
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- thread section
- external thread
- inner sleeve
- outer sleeve
- sleeve
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Abstract
The utility model discloses a screw extracting assembly which comprises an outer sleeve, an inner sleeve and a locking bar, wherein the outer sleeve is of a hollow structure, the outer diameter of the inner sleeve is matched with the inner diameter of the outer sleeve, the outer sleeve comprises a top internal thread section and a bottom annular section, and the bottom annular section is matched with a nut of a bone screw; the inner sleeve comprises a top external thread section and a bottom external thread section, the top external thread section is matched with the top internal thread section of the outer sleeve, the bottom external thread section is matched with inner-wall threads of the bone screw, the spiral direction of the top external thread section of the inner sleeve is opposite to the spiral direction of the bottom external thread section of the inner sleeve, a groove is formed in the center of the top end of the inner sleeve, and the outer diameter of the locking bar is matched with the inner diameter of the groove. In this way, directional torsion and the anti-slipping effect can be improved, the bone screw can be extracted easily, residual chippings do not exist, and the health of a patient is benefited.
Description
Technical field
This utility model relates to bone material field, particularly relates to a kind of nail combination unit of getting.
Background technology
Orthopaedics is an ancient disease, is accompanied by the beginning of mankind's activity, especially in the process of war, the patient of the fracture that trauma brings is also countless, traditional Therapeutic Method has that Gypsum Fibrosum is fixed, clamping plate, traction etc., but therapeutic effect is all satisfied not to the utmost, leaves unavoidably sequela.What is more due to the complication of fracturing and bringing, as blood vessel, nerve injury etc. all can produce life danger.Since 1940, be accompanied by fixing theoretical proposition in AO: be exactly preoperative detailed reading X mating plate, in art, carefully reset, the secondary insult of minimizing to tissue, select suitable steel plate to do interior fixing, rebuild physiology, the mechanical structure of fracture end as far as possible, reach strong fixing.The interior fixedly trial application of orthopaedics, for fractures has brought revolutionary change, interior fixing application is more and more extensive even to this day.In specialty, say, the Therapeutic Principle of fracture comprises reset, interior fixing, functional exercise, in interior fixing selection, has at present the various implant apparatuses such as steel plate screw, intramedullary pin.The compound mode of steel plate and screw is one of goldstandard, and effectively fixedly fracture site, supports for the healing of fracturing provides effective mechanics, promotes the healing of fracture.
After steel plate screw is fixing, for fracture provides stable mechanical environment, after fracture heals completely, draft in taking-up fixing.Existing most widely used screw structure is divided into nut and shank of screw forms.According to the difference of shank of screw, screw can be divided into self tapping and non-tapping screw; According to the spacing of screw thread, can be divided into spongy bone and os integumentale screw; According to the distributed number of screw thread, can be divided into half-thread and complete thread screw.The design specification of nut, mostly existingly is interior hexagonal structure, as is locking steel plate, also has thread lock system between nut and steel plate.
Clinically after union of fracture, need to be by interior fixedly taking-up, basic operating process is: first take out screw, then take out steel plate.The predicament often running into is clinically exactly that stripped thread appears in nut, and is difficult to take out screw, thereby causes steel plate to be difficult to remove.Trace it to its cause and roughly have several aspects: screw and bone are grown into firmly; Driver bit aging, does not mate with hexagonal structure in nut; Operative doctor operation mistake, anisotropy while getting nail, causes nut stripped thread.In order to take out screw, conventional method all belongs to certain destructiveness clinically, the damage of various degrees and sequela.The most frequently used is to polish off tail cap with high-intensity drill bit, then take out steel plate, then screw is taken out to screw by device for taking out broken nail mode of grooving, the result of bringing is that a large amount of metal fragment is residual, damage local soft tissue, after orthopaedics fluting, have the probability that refracture occurs.The way of other last resort, utilizes goose saw, bone forceps, the apparatus such as cuts energetically steel plate is bitten broken, then take out steel plate screw, but the position of fracture is often deep, and around muscle, nervus vasculairs are abundanter, easily cause the damage of surrounding tissue.The event of getting nail stripped thread often running into clinically, process is complicated, has often greatly extended operating time, to patient, has caused unnecessary misery.
And the patent that Chinese patent mandate publication number is CN201701295U, it discloses a kind of Orthopedic screw taking device simple in structure, easy to use, drill bit by cannulated sleeve bottom pierces screw, then with adding pressure bar, screw in cannulated sleeve, by rotation cannulated sleeve, bone screw is taken out after holding out against screw.This nail-fetching device can cause chip residual when drill bit pierces screw, damages local soft tissue, brings patient's misery.
Utility model content
The technical problem that this utility model mainly solves is to provide a kind of nail combination unit of getting, can improve the effect of direction torsion and anti-slip thread, be easy to take out bone screw, can effectively shorten the time of operation simultaneously, reduce intraoperative hemorrhage, send out the complication such as fracture again, alleviate patient's misery, and residual without chip, useful patient health.
For solving the problems of the technologies described above, the technical scheme that this utility model adopts is: a kind of nail combination unit of getting is provided, be used for taking out bone screw, comprise: outer sleeve, inner sleeve and locking rod, described outer sleeve is hollow-core construction, the external diameter of described inner sleeve and the internal diameter of described outer sleeve match, described outer sleeve comprises top internal thread segment and bottom circular segment, the nut of described bottom circular segment and bone screw matches, described inner sleeve comprises top external thread section and bottom external thread section, the top external thread section of described inner sleeve and the top internal thread segment of described outer sleeve match, the bottom external thread section of described inner sleeve and the inner thread of bone screw match, and the hand of spiral of the top external thread section of described inner sleeve and the screw thread of bottom external thread section is contrary, the centre, top of described inner sleeve is provided with a groove, the external diameter of described locking rod and the internal diameter of described groove match.
In preferred embodiment of this utility model, described locking rod comprises locking rod body and handle, described locking rod body and described handle form right angle shape, and the external diameter of described locking rod body and the internal diameter of described groove match.
In preferred embodiment of this utility model, described groove is tetragon groove.
In preferred embodiment of this utility model, the bottom external thread section of described inner sleeve is conical external thread section.
In preferred embodiment of this utility model, the bottom circular segment of described outer sleeve is interior hexagonal circular segment.
The beneficial effects of the utility model are: this utility model is by being arranged to rightabout by the externally threaded hand of spiral of the top external screw thread of inner sleeve and bottom, and by screw top and the locking rod self-locking of inside and outside sleeve, further improved the effect of direction torsion and anti-slip thread, be easy to take out bone screw, can effectively shorten the time of operation, reduce intraoperative hemorrhage, send out the complication such as fracture again, can alleviate patient's misery simultaneously, and residual without chip, useful patient health.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of getting one preferred embodiment of nail combination unit of this utility model;
Fig. 2 is the structural representation of outer sleeve shown in Fig. 1;
Fig. 3 is the structural representation of inner sleeve shown in Fig. 1;
Fig. 4 is the structural representation of locking rod shown in Fig. 1;
In accompanying drawing, the labelling of each parts is as follows: 1, outer sleeve, 11, top internal thread segment, 12, bottom circular segment, 2, inner sleeve, 21, top external thread section, 22, bottom external thread section, 23, groove, 3, locking rod, 31, locking rod body, 32, handle.
The specific embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, thereby so that advantage of the present utility model and feature can be easier to be it will be appreciated by those skilled in the art that, protection domain of the present utility model is made to more explicit defining.
Refer to Fig. 1-Fig. 4, this utility model embodiment comprises:
A kind of nail combination unit of getting, be used for taking out bone screw, comprise: outer sleeve 1, inner sleeve 2 and locking rod 3, described outer sleeve 1 is hollow-core construction, the internal diameter of the external diameter of described inner sleeve 2 and described outer sleeve 1 matches, described outer sleeve 1 comprises top internal thread segment 11 and bottom circular segment 12, described bottom circular segment 12 matches with the nut of bone screw, described inner sleeve 2 comprises top external thread section 21 and bottom external thread section 22, the top external thread section 21 of described inner sleeve 2 matches with the top internal thread segment 11 of described outer sleeve 1, can lock, the bottom external thread section 22 of described inner sleeve 2 matches with the inner thread of bone screw, can lock, and the hand of spiral of the top external thread section 21 of described inner sleeve 2 and the screw thread of bottom external thread section 22 is contrary, the centre, top of described inner sleeve 2 is provided with a groove 23, the internal diameter of the external diameter of described locking rod 3 and described groove 23 matches.
Wherein, described locking rod 3 comprises locking rod body 31 and handle 32, described locking rod body 31 and described handle 32 form right angle shapes, and the internal diameter of the external diameter of described locking rod body 31 and described groove 23 matches.
In the present embodiment, described groove 23 is tetragon groove.
The bottom external thread section 22 of described inner sleeve 2 is conical external thread section.
The bottom circular segment 12 of described outer sleeve 1 is interior hexagonal circular segment.
While getting nail, the nut (being generally interior hexagonal structure) of first the bottom circular segment 12 of outer sleeve 1 being inserted to bone screw; Then inner sleeve 2 is inserted in outer sleeve 1, and rotate inner sleeve 2, the bottom external thread section 22 of inner sleeve 2 and the inner thread of bone screw are closely cooperated; Then locking rod 9 is inserted in the top groove 23 of inner sleeve 2, by locking rod 9, pressurize, nail combination unit is got in locking; Nail combination unit is got in finally reverse rotation, due to the hand of spiral of the top external thread section 21 of inner sleeve 2 and the screw thread of bottom external thread section 22, just can easily take out bone screw.
This utility model has disclosed a kind of nail combination unit of getting, by the externally threaded hand of spiral of the top external screw thread of inner sleeve and bottom is arranged to rightabout, and by screw top and the locking rod self-locking of inside and outside sleeve, the effect that has further improved direction torsion and anti-slip thread, is easy to take out bone screw, can effectively shorten the time of operation simultaneously, reduce intraoperative hemorrhage, send out the complication such as fracture again, alleviate patient's misery, and residual without chip, useful patient health.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes this utility model description and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (5)
1. get nail combination unit for one kind, be used for taking out bone screw, it is characterized in that, comprise: outer sleeve, inner sleeve and locking rod, described outer sleeve is hollow-core construction, the external diameter of described inner sleeve and the internal diameter of described outer sleeve match, described outer sleeve comprises top internal thread segment and bottom circular segment, the nut of described bottom circular segment and bone screw matches, described inner sleeve comprises top external thread section and bottom external thread section, the top external thread section of described inner sleeve and the top internal thread segment of described outer sleeve match, the bottom external thread section of described inner sleeve and the inner thread of bone screw match, and the hand of spiral of the top external thread section of described inner sleeve and the screw thread of bottom external thread section is contrary, the centre, top of described inner sleeve is provided with a groove, the external diameter of described locking rod and the internal diameter of described groove match.
2. the nail combination unit of getting according to claim 1, is characterized in that, described locking rod comprises locking rod body and handle, described locking rod body and described handle form right angle shape, and the external diameter of described locking rod body and the internal diameter of described groove match.
3. according to the arbitrary described nail combination unit of getting of claim 1 or 2, it is characterized in that, described groove is tetragon groove.
4. the nail combination unit of getting according to claim 1, is characterized in that, the bottom external thread section of described inner sleeve is conical external thread section.
5. the nail combination unit of getting according to claim 1, is characterized in that, the bottom circular segment of described outer sleeve is interior hexagonal circular segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420052784.8U CN203736299U (en) | 2014-01-27 | 2014-01-27 | Screw extracting assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420052784.8U CN203736299U (en) | 2014-01-27 | 2014-01-27 | Screw extracting assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203736299U true CN203736299U (en) | 2014-07-30 |
Family
ID=51336175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420052784.8U Expired - Fee Related CN203736299U (en) | 2014-01-27 | 2014-01-27 | Screw extracting assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203736299U (en) |
-
2014
- 2014-01-27 CN CN201420052784.8U patent/CN203736299U/en not_active Expired - Fee Related
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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: 20140730 Termination date: 20180127 |