CN210811475U - Special half-thread hollow screw extracting tool for assisting orthopedics department - Google Patents
Special half-thread hollow screw extracting tool for assisting orthopedics department Download PDFInfo
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- CN210811475U CN210811475U CN201920997100.4U CN201920997100U CN210811475U CN 210811475 U CN210811475 U CN 210811475U CN 201920997100 U CN201920997100 U CN 201920997100U CN 210811475 U CN210811475 U CN 210811475U
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- hollow screw
- barb
- well core
- core rod
- screw
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Abstract
The utility model relates to a help special half thread hollow screw of orthopedics to take out instrument, be greater than hollow screw and can embolia well core rod of hollow screw including length, well core rod one end is provided with the barb that turns over to the book and radially have elastic deformation, the outermost circle diameter equals well core rod diameter when the barb draws in to well core rod, well core rod diameter less than or equal to hollow screw bottom internal diameter. The barb and the central rod are connected into a whole, the barb can extend into the bottom of the hollow screw along with the pushing of the central rod, the diameter of the central rod is smaller than or equal to the inner diameter of the bottom of the hollow screw, the barb can extend out of the bottom of the hollow screw and can elastically stretch out to clamp a self-tapping notch at the bottom of the hollow screw, and the barb can apply tension to the bottom of the hollow screw during screw pulling. The utility model discloses simple structure, convenient to use can prevent that hollow screw from beating in situ and changeing or splitting taking out the in-process, improves operation efficiency, alleviates patient's misery.
Description
Technical Field
The utility model relates to the field of medical auxiliary instruments, in particular to an instrument for assisting the taking out of a half-thread hollow screw special for orthopedics.
Background
In orthopedic surgery, especially in senile hip fracture accompanied by osteoporotic fracture surgery, internal fixation of hollow cancellous screws is a common method because hollow screws have structural advantages that common screws do not have, and particularly half-thread cancellous screws are more widely applied. Its advantages are high biologic mechanical performance, and high compression effect to the broken end of bone. Although the process of taking out the half-thread hollow screw is relatively simple, the screw can not be taken out in situ due to osteoporosis because of less threads in the process of taking out the half-thread hollow screw, or the proximal part of the screw is tightly combined with bone, the stress is concentrated at the tail of the screw in the process of taking out the half-thread hollow screw, so that the micro-end nut can be broken, and finally, a forcep remover has to be used, so that the operation method has great destructiveness to the bone and brings unnecessary pain to a patient. The second step is as follows: in the process of operation, the operator is inexperienced or improperly operated, the screw length is selected to be too long or screwed too deep, and the situation that the front end thread completely penetrates through the bone and is difficult to advance and retreat easily occurs. The mistakenly placed screw must be taken out when the placed screw is readjusted, the phenomenon of in-situ rotation must occur when the hollow screw is screwed back by a common screw taking device, and particularly, the screw taking device with strong destructiveness is used for taking the screw when the tail cap is embedded into the bone, so that the time is wasted, and the great pain is caused to the patient.
SUMMERY OF THE UTILITY MODEL
The utility model discloses be exactly to prior art not enough, provide a simple structure, convenient to use can prevent that hollow screw from beating in situ and changeing or splitting taking out the in-process, improves operation efficiency, alleviates the painful special half thread hollow screw of assistance orthopedics of patient and takes out instrument.
In order to solve the problem, the utility model discloses a help special half thread cannulated screw of orthopedics to take out instrument, be greater than cored rod that cannulated screw just can embolia cored screw including length, well core rod one end is provided with the barb that turns over to the book and radially have elastic deformation, outermost circle diameter equals well core rod diameter when the barb draws in to well core rod, well core rod diameter less than or equal to cannulated screw bottom internal diameter.
Furthermore, the number of the barbs is 2, the barbs and the central rod are integrally formed and formed by outwards turning the end part of the central rod, and the central rod is made of titanium alloy. Preferably well core rod is for having the material of certain elasticity and making, when promoting well core rod and make the barb reach the hollow screw bottom, the barb is because tension makes its hold the claw and the self-tapping notch phase-match of hollow screw bottom, exerts the power of upwards lifting and pulling to the hollow screw bottom, can prevent that hollow screw from appearing the fracture in the process of taking out.
Furthermore, the upper end of the central rod is also provided with a threading hole. The threading hole is used for penetrating a steel wire, so that the center rod can be conveniently lifted, and upward force is applied to the hollow screw.
Advantageous effects
The utility model discloses simple structure can prevent that hollow screw from beating in situ and changeing or splitting taking out the in-process, improves operation efficiency, alleviates patient's misery. The barb that turns over outwards and radially have elastic deformation is provided with well core rod bottom, the diameter of outer lane is unanimous with well core rod diameter when the barb draws in, the barb links as an organic whole with well core rod, can stretch into the hollow screw bottom along with well core rod's propulsion, well core rod diameter less than or equal to hollow screw bottom internal diameter, both can make well core rod drive the barb and stretch into the hollow screw bottom, can make the barb stretch out the hollow screw bottom again and elasticity opens the self-tapping notch in order to block the hollow screw bottom, can apply the pulling force to the hollow screw bottom when making the nail pull out. The utility model is used for cooperating hollow screw bottle opener synchronous use, after putting steady hollow screw bottle opener, the barb of well core rod and bottom passes through hollow screw's central hole and slowly impels, when the top of this assistance instrument reaches hollow screw's bottom, but barb that elasticity was held tightly can pop out just and block mutually with hollow screw's bottom tapping notch, the threading hole department on well core rod top penetrates the steel wire or uses the wire pliers to carry the tail end and carry at this time, in the process of unscrewing with the screw bottle opener, through well core rod and barb, the effect produces an outside pulling force at hollow screw, easily unscrew half-thread hollow screw under this pulling force effect, and difficult original place is beaten and is changeed and the broken nail, simple operation can improve operation efficiency, alleviate patient's misery simultaneously.
Drawings
Fig. 1 is a schematic structural view of a cannulated screw.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is an enlarged schematic view of the barb of the present invention.
Fig. 4 is a partial sectional view of the present invention in cooperation with a hollow screw.
Reference numerals: 1-hollow screw, 2-central rod, 3-barb and 4-threading hole.
Detailed Description
The invention will be described in further detail with reference to the following figures and specific embodiments:
the special semi-thread hollow screw taking-out tool for assisting orthopedics comprises a central rod 2 which is longer than the hollow screw 1 and can be sleeved in the hollow screw 1, wherein one end of the central rod 2 is provided with a barb 3 which is turned outwards and has elastic deformation along the radial direction, the diameter of the outermost ring is equal to that of the central rod 2 when the barb 3 is folded towards the central rod 2, and the diameter of the central rod 2 is smaller than or equal to the inner diameter of the bottom of the hollow screw 1. The barb that turns over outwards and radially have elastic deformation is provided with well core rod bottom, the diameter of outer lane is unanimous with well core rod diameter when the barb draws in, the barb links as an organic whole with well core rod, can stretch into the hollow screw bottom along with well core rod's propulsion, well core rod diameter less than or equal to hollow screw bottom internal diameter, both can make well core rod drive the barb and stretch into the hollow screw bottom, can make the barb stretch out the hollow screw bottom again and elasticity opens the self-tapping notch in order to block the hollow screw bottom, can apply the pulling force to the hollow screw bottom when making the nail pull out.
Preferably, the number of the barbs 3 is 2, and the barbs 3 are integrally formed with the central rod 2 and formed by turning the end part of the central rod 2 outwards. Preferably, the center rod is made of titanium alloy. The material of the center rod is preferably a material with certain elasticity. The number of barbs can be changed according to the situation, and 2 barbs, 3 barbs or even more barbs can be arranged. When the central rod is pushed to enter the hollow screw, the barb is folded to be consistent with the diameter of the central rod, so that the barb can continuously extend into the hollow screw, when the barb reaches the bottom of the hollow screw and extends out, the barb enables the holding claw to be matched with the self-tapping notch at the bottom end of the hollow screw due to tension, the lifting central rod can apply upward lifting force to the bottom of the hollow screw, and the hollow screw can be prevented from being broken or being rotated in place in the taking-out process.
Preferably, the upper end of the central rod 2 is also provided with a threading hole 4. The threading hole is used for penetrating a steel wire, so that the center rod can be conveniently lifted, and upward force is applied to the hollow screw.
The utility model discloses a help special half thread hollow screw of orthopedics to take out instrument for cooperation hollow screw bottle opener synchronous use is putting after stablizing hollow screw bottle opener, will the utility model discloses a hollow screw's central hole slowly impels, works as this the utility model discloses a when well core rod promoted the bottom that the barb reachd hollow screw, have tensile barb can pop out and carry with hollow screw's bottom tapping notch mutually, make the utility model discloses become an organic whole with hollow screw, at this time the threading hole department on well core rod top penetrates the steel wire line or uses the wire pliers to clip well core rod top and carry and draw, when screwing out the process with the screw bottle opener, well core rod passes through well core rod and barb, produces an outside pulling force to hollow screw bottom to reach the purpose that prevents that hollow screw fracture or original place from beating and changeing. The utility model discloses but wide application in bone surgery, simple structure, convenient operation can improve the efficiency of getting the nail in the operation greatly, alleviates the misery of disease.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. The utility model provides a help special half thread cannulated screw of orthopedics to take out instrument which characterized in that: the hollow screw comprises a central rod (2) which is longer than the hollow screw (1) and can be sleeved in the hollow screw (1), wherein one end of the central rod (2) is provided with a barb (3) which is turned outwards and has elastic deformation along the radial direction, the diameter of the outermost ring is equal to that of the central rod (2) when the barb (3) is folded towards the central rod (2), and the diameter of the central rod (2) is smaller than or equal to the inner diameter of the bottom of the hollow screw (1).
2. The tool for assisting the extraction of the semi-threaded cannulated screw special for orthopedics according to claim 1, wherein: barb (3) quantity is 2, barb (3) and well core rod (2) integrated into one piece turn over outward by well core rod (2) tip and form, well core rod (2) are well core rod (2) that titanium alloy made.
3. The tool for assisting the extraction of the semi-threaded cannulated screw special for orthopedics according to claim 1, wherein: the upper end of the center rod (2) is also provided with a threading hole (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920997100.4U CN210811475U (en) | 2019-06-28 | 2019-06-28 | Special half-thread hollow screw extracting tool for assisting orthopedics department |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920997100.4U CN210811475U (en) | 2019-06-28 | 2019-06-28 | Special half-thread hollow screw extracting tool for assisting orthopedics department |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210811475U true CN210811475U (en) | 2020-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920997100.4U Active CN210811475U (en) | 2019-06-28 | 2019-06-28 | Special half-thread hollow screw extracting tool for assisting orthopedics department |
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| CN (1) | CN210811475U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112353482A (en) * | 2020-11-10 | 2021-02-12 | 无锡市第九人民医院 | Minimally invasive intramedullary broken nail extractor |
-
2019
- 2019-06-28 CN CN201920997100.4U patent/CN210811475U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112353482A (en) * | 2020-11-10 | 2021-02-12 | 无锡市第九人民医院 | Minimally invasive intramedullary broken nail extractor |
| CN112353482B (en) * | 2020-11-10 | 2022-07-05 | 无锡市第九人民医院 | Minimally invasive intramedullary broken nail extractor |
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