CN204092170U - A kind of Universal pedicle screw extractor - Google Patents
A kind of Universal pedicle screw extractor Download PDFInfo
- Publication number
- CN204092170U CN204092170U CN201420576961.2U CN201420576961U CN204092170U CN 204092170 U CN204092170 U CN 204092170U CN 201420576961 U CN201420576961 U CN 201420576961U CN 204092170 U CN204092170 U CN 204092170U
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- CN
- China
- Prior art keywords
- outer sleeve
- cylinder groove
- interior spanner
- spanner
- thread
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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
This utility model relates to the technical field of medical apparatus, disclose a kind of Universal pedicle screw extractor, it comprises outer sleeve and interior spanner, these outer sleeve two ends are connected, outer sleeve upper end is provided with the female cylinder groove of a tool, two shanks are at least provided with at cylinder groove outer surface, this outer sleeve lower end is provided with the external screw thread connecting Universal pedicle screw U-lag, interior spanner upper end is provided with the external screw thread of the cylinder groove connecting outer sleeve, this interior spanner upper end end face is provided with handle portion, interior spanner lower end is run through and is connected in outer sleeve, this utility model is that the taking-up of Universal pedicle screw is provided convenience, be applicable to distortion, stripped thread or other states cause getting the situations such as nail difficulty.
Description
Technical field
This utility model relates to the technical field of medical apparatus, refers in particular to the extractor that the Universal pedicle screw in use takes out by a kind of convenience.
Background technology
Universal pedicle screw is provided with the U-lag of clockwise female thread by upper part, bottom is divided into the rivet nut of different size (wherein, shaft diameter is 5.5,6.0,6.5 or 7.0mm, its length is 30 ~ 55mm) composition, U-lag card is provided with in middle connecting place, rivet nut upper end is oval, this upper end is formed with the interior hexagon cylinder spanner skewer entrance that diameter is 3.5mm, between U-lag and rivet nut, universal floating angle is 28 °, when the pitman of inserting in U-lag is inserted, U-lag and rivet nut do not need on the same line.Insert pitman in U-lag, be screwed down by jackscrew, pitman can make U-lag and rivet nut form out-of-line firm complex after compressing U-lag card.
Under normal condition, no matter put nail or get nail, sleeve screws in U-lag, the other end is that the hexagonal cylindrical spanner of diameter 3.5mm needs skewer to enter in the interior hexagonal skewer entrance of rivet nut upper end, must be spanner, U-lag and rivet nut on the same line, just can complete inserting or taking out of Universal pedicle screw, and conventional design is followed closely clockwise as inserting, counterclockwise nail is for taking out.
After certain hour inserted by nail, when need take out, the callus formed during previous bone-graft fusion is often had around U-lag, and when getting nail, in order to not affect later stability, nail callus around should not be removed, because U-lag and rivet nut are normal not on the same line, conventional hex wrench front end is cylindrical, and end is a plane, by adjusting the position of U-lag, be difficult to directly spanner skewer be entered in the skewer entrance of hexagon in rivet nut upper end.Separately there is part because of material, manufacturing process, or previous procedure misoperation, easily cause the skewer entrance of hexagon in rivet nut upper end to be out of shape, or hex wrench corner angle become circle, distortion, after skewer enters, stripped thread, distortion often occur, cause getting nail difficulty.
Summary of the invention
The purpose of this utility model is overcome weak point of the prior art and provide a kind of Universal pedicle screw extractor, this extractor is that the taking-up of Universal pedicle screw is provided convenience, and is applicable to distortion, stripped thread or other states and causes getting the situations such as nail difficulty.
For achieving the above object, this utility model adopts following technical scheme:
A kind of Universal pedicle screw extractor, it comprises outer sleeve and interior spanner, these outer sleeve two ends are connected, described outer sleeve upper end is provided with the female cylinder groove of a tool, at least be provided with two shanks at cylinder groove outer surface, this outer sleeve lower end is provided with the external screw thread connecting Universal pedicle screw U-lag, and described interior spanner upper end is provided with the external screw thread of the cylinder groove connecting outer sleeve, this interior spanner upper end end face is provided with handle portion, and interior spanner lower end is run through and is connected in outer sleeve.
The cylinder groove of described outer sleeve is provided with two symmetrical U-shaped otch, and this two U-shapeds size incision is consistent, and the female thread of cylinder groove is left hand thread, and the diameter of this cylinder groove is greater than the diameter of outer sleeve lower end.
The cylinder groove outer surface of described outer sleeve is provided with two shanks, these two symmetrical settings of shank.
The external screw thread of described outer sleeve lower end is right-handed thread.
Described interior spanner is in T shape, and the external screw thread of this interior spanner upper end is left hand thread, and the upper end diameter of this interior spanner is greater than the diameter of the lower end of interior spanner.
Described interior spanner lower end terminal part by radially hexagonal changeover portion and conically tip cone end form.
The beneficial effects of the utility model are: the rivet nut being connected Universal pedicle screw by outer sleeve, within spanner match with outer sleeve, it is interior spanner, the rivet nut of outer sleeve and Universal pedicle screw, U-lag forms a close body, when being mutually screwed down, enter U-lag card and radial hexagon changeover portion by the conical tip cone end of interior spanner lower end terminal part to enter and stick into hex wrench skewer entrance in U-lag card and rivet nut upper end, curvilinear angle becomes a straight line gradually, and keep in a straight line, and then taking-up rivet nut, the cooperation of outer sleeve and interior spanner, facilitate the taking-up of Universal pedicle screw, be applicable to the taking-up of the Universal pedicle screw getting nail and stripped thread or deformation state at ordinary times.
Accompanying drawing explanation
Fig. 1 is surface structure schematic diagram of the present utility model.
Fig. 2 is full sectional view of the present utility model.
Fig. 3 is the structure chart of the outer sleeve of this utility model.
Fig. 4 is the structure chart of spanner within this utility model.
Detailed description of the invention
Below in conjunction with Figure of description, the utility model is described in further detail:
As Figure 1-4, this utility model is about a kind of Universal pedicle screw extractor, and it comprises outer sleeve 1 and interior spanner 2, and this outer sleeve 1 center is formed with centre bore 11, and outer sleeve 1 two ends are connected.
As Figure 2-3, outer sleeve 1 upper end is provided with the cylinder groove 12 that has female thread a, two shanks 13 are at least provided with at cylinder groove 12 outer surface, the cylinder groove 12 of outer sleeve 1 is provided with two symmetrical U-shaped otch 14, this two U-shapeds otch 14 size is consistent, the height of this cylinder groove 12 is 2 times that skewer enters the skewer entrance inner height of Universal pedicle screw upper end hexagon, for cylinder shank 13 screw downward time, reserved enough deflation spaces and height, the female thread a of cylinder groove 12 is left hand thread, the diameter of this cylinder groove 12 is greater than the diameter of outer sleeve 1 lower end, wherein, cylinder groove 12 outer surface of outer sleeve 1 is preferably provided with two shanks 13, these two symmetrical settings of shank 13.
As Figure 2-3, outer sleeve 1 lower end is provided with the external screw thread b connecting Universal pedicle screw U-lag, this external screw thread b is right-handed thread, the diameter of this external screw thread b is 6.5mm, consistent with conventional jackscrew diameter, and hand of spiral and design are with general jackscrew, threaded integral height is slightly longer than the degree of depth of pedicle nail U-lag.
As shown in Figure 2,4, interior spanner 2 is in T shape, interior spanner 2 upper end is provided with the external screw thread b of the cylinder groove 12 connecting outer sleeve 1, this interior spanner 2 upper end end face is provided with handle portion 21, interior spanner 2 lower end is run through and is connected in the centre bore 11 of outer sleeve 1, outer sleeve 1 is slightly stretched out in interior spanner 2 lower end, interior spanner 2 lower end terminal part 22 by radially hexagonal changeover portion 221 and conically tip cone end 222 form.
As shown in Figure 2,4, the external screw thread b of interior spanner 2 upper end is left hand thread, and the diameter of this external screw thread b is 6.5mm, and the upper end diameter of this interior spanner 2 is greater than the diameter of the lower end of interior spanner 2.
A kind of Universal pedicle screw extractor that this utility model discloses, in time operating, first outer sleeve 1 is screwed in the U-lag of nail clockwise, again interior spanner 2 skewer is entered in outer sleeve 1, spanner 2 in counterclockwise screw-in, when screwing in downward, jog outer sleeve 1, the top of spanner front cone is made to be introduced into the residual arc port of U-lag card and U-lag, screw in downwards gradually and jog outer sleeve 1, spanner conical tip is entered completely, and arrived in the skewer entrance of hexagon in rivet nut upper end by U-lag card, be screwed down again, that the radial hexagon of spanner compresses U-lag card and part enters in the skewer entrance of the interior hexagon of rivet nut upper end, by the setting in outer sleeve 1 and interior spanner 2 opposite threads direction, screw in phase reciprocal to opposing, make interior spanner 2, outer sleeve 1 and rivet nut, U-lag forms a close body, and keep in a straight line, continue to be rotated counterclockwise spanner, just rivet nut can be taken out.
The above is only to preferred embodiment of the present utility model; not scope of the present utility model is limited; therefore under the prerequisite not departing from this utility model design spirit; the equivalence change that the common engineers and technicians in this area do structure described in the utility model, feature and principle or decoration, all should fall in protection domain that this utility model applies for a patent.
Claims (6)
1. a Universal pedicle screw extractor, it comprises outer sleeve and interior spanner, these outer sleeve two ends are connected, it is characterized in that: described outer sleeve upper end is provided with the female cylinder groove of a tool, at least be provided with two shanks at cylinder groove outer surface, this outer sleeve lower end is provided with the external screw thread connecting Universal pedicle screw U-lag, and described interior spanner upper end is provided with the external screw thread of the cylinder groove connecting outer sleeve, this interior spanner upper end end face is provided with handle portion, and interior spanner lower end is run through and is connected in outer sleeve.
2. extractor according to claim 1, it is characterized in that: the cylinder groove of described outer sleeve is provided with two symmetrical U-shaped otch, this two U-shapeds size incision is consistent, and the female thread of cylinder groove is left hand thread, and the diameter of this cylinder groove is greater than the diameter of outer sleeve lower end.
3. extractor according to claim 1, is characterized in that: the cylinder groove outer surface of described outer sleeve is provided with two shanks, these two symmetrical settings of shank.
4. extractor according to claim 1, is characterized in that: the external screw thread of described outer sleeve lower end is right-handed thread.
5. extractor according to claim 1, is characterized in that: described interior spanner is in T shape, and the external screw thread of this interior spanner upper end is left hand thread, and the upper end diameter of this interior spanner is greater than the diameter of the lower end of interior spanner.
6. extractor according to claim 1 or 5, is characterized in that: described interior spanner lower end terminal part by radially hexagonal changeover portion and conically tip cone end form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420576961.2U CN204092170U (en) | 2014-10-09 | 2014-10-09 | A kind of Universal pedicle screw extractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420576961.2U CN204092170U (en) | 2014-10-09 | 2014-10-09 | A kind of Universal pedicle screw extractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204092170U true CN204092170U (en) | 2015-01-14 |
Family
ID=52260642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420576961.2U Expired - Fee Related CN204092170U (en) | 2014-10-09 | 2014-10-09 | A kind of Universal pedicle screw extractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204092170U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114948172A (en) * | 2022-05-27 | 2022-08-30 | 郑州市骨科医院 | Universal extractor for pedicle screws |
-
2014
- 2014-10-09 CN CN201420576961.2U patent/CN204092170U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114948172A (en) * | 2022-05-27 | 2022-08-30 | 郑州市骨科医院 | Universal extractor for pedicle screws |
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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: 20150114 Termination date: 20191009 |