CN115708714A - Knock-in type self-tapping main nail suitable for low-notch internal fixing system of femoral neck - Google Patents
Knock-in type self-tapping main nail suitable for low-notch internal fixing system of femoral neck Download PDFInfo
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- CN115708714A CN115708714A CN202211462262.0A CN202211462262A CN115708714A CN 115708714 A CN115708714 A CN 115708714A CN 202211462262 A CN202211462262 A CN 202211462262A CN 115708714 A CN115708714 A CN 115708714A
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Abstract
The invention discloses a knock-in self-tapping main nail suitable for a low-notch internal fixation system of a femoral neck, which comprises a self-tapping blade, wherein the self-tapping blade is integrally cylindrical, the rear end of the self-tapping blade is limited and installed in a main nail body through a limiting screw, the main nail body is internally of a hollow structure and is provided with an installation space for a guide pin and an anti-screwing screw to penetrate through, the upper part of the main nail body is provided with a guide opening, the guide opening is communicated with the installation space, a sliding block is installed in the installation space, and guide pin holes are formed in the self-tapping blade and the sliding block. This self tapping owner nail and low notch sliding sleeve cooperation need not the electric drill drilling, only need use the electric drill to bore out thighbone near-end outside cortex, and the bone mass is lost less, and is safer with the osteoporosis patient to the old person, and fracture once more of postoperative femoral neck and risk of nonunion are littleer.
Description
Technical Field
The invention relates to the technical field of self-tapping nails, in particular to a knock-in type self-tapping nail suitable for a low-notch internal fixing system of a femoral neck.
Background
The company of Depuy Synthes of Switzerland develops a novel femoral Neck internal fixation System (FNS), which consists of a sliding sleeve, a power rod, an anti-rotation screw and a locking screw, has small surgical trauma, anti-rotation and anti-shearing force, and has the function of fracture end pressurization. Compared with the traditional three hollow screws and Dynamic Hip Screws (DHS) fixation, the novel dynamic hip screw has better stability in a biomechanical test, and can effectively prevent eversion collapse and rotation failure.
In clinical application, the FNS needs to drill the proximal end of the femur by using a large-diameter drill before being placed, so that a large amount of bone substances at the proximal end of the femur are damaged and lost, when a patient is old, the bone mass is very seriously lost, the stability of the FNS is extremely easy to reduce after the FNS is fixed, and secondary fracture or fracture nonunion and other conditions are induced. And according to simulation analysis results, the FNS main nail is mainly used for bearing vertical shearing force of a fracture broken end, and meanwhile, due to the fact that the FNS main nail is provided with limiting depressions, a large amount of stress is concentrated at the depressions due to sudden shape change, and the main nail is prone to fracture failure due to long-term stress circulation.
Disclosure of Invention
The invention aims to provide a self-tapping nail suitable for a low-incisura internal fixation system of a femoral neck, which solves the problems mentioned in the background technology. In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a knock-in formula self tapping main nail suitable for low notch internal fixation system of thighbone neck, includes the self tapping blade, the self tapping blade is whole to be cylindricly, the self tapping blade rear end is through spacing the installation in the main nail main part of spacing screw, the inside hollow structure that is of main nail main part is equipped with the installation space that supplies guide pin and anti-spiral screw to pass, main nail main part upper portion is opened there is the guide mouth, guide mouth and installation space intercommunication, installation space internally mounted has the slider, self tapping blade and the inside opening of slider have the guide pin hole.
Preferably, the self tapping blade includes the self tapping tool bit, the installation end is connected to self tapping tool bit rear end, the installation end is located the main nail main part inside, it has the annular sunken to open on the installation end, the annular sunken cooperation limit screw is spacing to be installed in the main nail main part.
Preferably, the rear end face of the mounting end is provided with saw-toothed projections.
Preferably, the two sides of the outer part of the rear end of the main nail body are provided with cylindrical bulges, and the inner side of the rear end is provided with threads.
Preferably, the slider is wholly cylindrical, the bottom of the slider is of a plane structure, and the front end face of the slider is provided with a saw-toothed protrusion.
The invention has the technical effects and advantages that: this self tapping owner nail and low notch sliding sleeve cooperation need not the electric drill drilling, only need use the electric drill to bore out thighbone near-end outside cortex, and the bone mass is lost less, and is safer with the osteoporosis patient to the old person, and fracture once more of postoperative femoral neck and risk of nonunion are littleer. This main nail can provide the slip pressurization effect the same with FNS, and the anti ability of revolving is stronger with anti screw cooperation anti, and postoperative fracture broken ends are more stable. The main nail body has no limit recess, adopts the convex limit design, has better shearing capacity and smaller fracture risk.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the present invention;
fig. 3 is a schematic diagram of the present invention.
In the figure: 1-self-tapping blade, 2-self-tapping cutter head, 3-mounting end, 4-annular recess, 5-limit screw, 6-main nail body, 7-anti-screwing screw, 8-guide opening, 9-cylindrical bulge, 10-sleeve, 11-slide block, 12-guide pin hole and 13-sawtooth-shaped bulge.
Detailed Description
In the description of the present invention, it should be noted that unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, either fixedly connected, detachably connected, integrally connected, mechanically connected, or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
Examples
As shown in fig. 1-3, the knock-in type self-tapping nail suitable for the femoral neck low-notch internal fixation system comprises a self-tapping blade 1, wherein the self-tapping blade 1 is integrally cylindrical and comprises a self-tapping cutter head 2, the rear end of the self-tapping cutter head 2 is connected with a mounting end 3, an annular recess 4 is formed in the mounting end 3, the annular recess 4 and a limiting screw 5 are installed in a main nail body 6 in a matched mode, the self-tapping blade 1 can rotate freely and cannot move back and forth in an unlocked state, and self-tapping capability is provided through rotation when the main nail is knocked in;
the inside hollow structure that is of main nail main part 6 is equipped with the installation space that supplies guide pin and anti-screw 7 to pass, and 6 upper portions of main nail main part are opened has the guide mouth 8 that can guide anti-screw to pass with 7.5 angles, and guide mouth 8 and installation space intercommunication, 6 rear end inboards of main nail main part are equipped with the screw thread and can be fixed anti-screw 7. Two sides of the outer part of the rear end of the main nail body 6 are provided with cylindrical protrusions 9 which are matched with the low-notch sliding sleeve 10 to play a role in limiting the rotation of the self-tapping main nail;
the installation space internally mounted of main nail main part 6 has slider 11, and slider 11 is whole to be cylindricly, and the bottom of slider is planar structure, can slide around in main nail main part 6 is inside, unable rotation. Guide pin holes 12 are formed in the self-tapping blade 1 and the slider 11, and sawtooth-shaped protrusions 13 which are matched with each other are arranged on the front end face of the slider 11 and the rear end face of the mounting end 3. When the self-tapping main nail is in an unlocked state, the slider 11 in the main nail body 6 can move freely and cannot limit the rotation of the self-tapping blade 1, and at the moment, the tail of the self-tapping main nail can be knocked by a hammer and is guided by the guide pin to be rotationally tapped into the femoral head through the self-tapping blade 1. When the anti-rotation screw 7 is screwed in, the sliding block 11 can be pushed forwards by the anti-rotation screw 7 along with the entry of the anti-rotation screw 7, when the anti-rotation screw 7 is screwed down, the sliding block 11 is locked along with the anti-rotation screw, and at the moment, the sliding block 11 is tightly combined with the tapping blade 1 through the saw-toothed protrusions 13, so that the tapping blade 1 is locked and cannot rotate, and the purpose of locking is achieved.
And the self-tapping main nail is matched with the low-notch sliding sleeve 10, is compatible with the anti-rotation screw 7 and the locking screw of the FNS system which is on the market at present, provides the same biomechanical property as the FNS, does not need to drill deeply when being placed, only needs to drill the outer cortex of the proximal end of the femur, and enters the femoral head by tapping through knocking, so that cancellous bone is compressed around the self-tapping main nail, the bone loss is less, and the internal fixation strength is increased. The self-tapping blade 1 and the anti-rotation screw 7 are matched to have stronger anti-rotation capacity, and the stability of the fracture end after operation is improved.
The process flow and the working principle of the invention are as follows: after the main nail placing direction is positioned and determined by using the guide, drilling the outer cortex of the proximal end of the femur by using an electric drill, selecting a main nail with a proper length, placing the main nail from the tail part of the sleeve 10, inserting the holder into the main nail and the tail part of the sleeve 10, and fastening the sleeve 10 and the main nail;
after the main nail passes through the guide pin hole 12, a hammer is used for knocking a holder, the holder pushes the main nail to attack the femoral head to a proper position, and after the correct placement is confirmed under perspective, the guide pin is removed;
drilling holes along the anti-rotation screw holes of the holder by using an electric drill and screwing in the anti-rotation screws 7, locking the anti-rotation screws 7 with the main nail and locking the self-tapping blade 1; drilling holes by using an electric drill according to the locking screw guider and screwing in the locking screws; finally, the holder is removed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions and improvements to part of the technical features of the foregoing embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a knock-in self tapping staple suitable for thighbone neck low notch internal fixation system, includes the self tapping blade, its characterized in that: the self-tapping blade is wholly cylindrical, the rear end of the self-tapping blade is installed in the main nail body in a limiting mode through a limiting screw, the main nail body is internally hollow and is provided with an installation space for a guide pin and an anti-screwing screw to penetrate, a guide opening is formed in the upper portion of the main nail body and is communicated with the installation space, a sliding block is installed inside the installation space, and a guide pin hole is formed in the self-tapping blade and the sliding block.
2. The self-tapping nail of the knock-in type suitable for the femoral neck low-notch internal fixation system as claimed in claim 1, wherein: the self tapping blade includes the self tapping tool bit, the installation end is connected to self tapping tool bit rear end, the installation end is located the main nail main part inside, it has annular sunken to open on the installation end, annular sunken cooperation spacing screw is spacing to be installed in the main nail main part.
3. The self-tapping nail of claim 2, wherein the self-tapping nail is adapted for use in a femoral neck low-notch internal fixation system, and comprises: the rear end face of the mounting end is provided with a sawtooth-shaped bulge.
4. The self-tapping nail of the knock-in type suitable for the femoral neck low-notch internal fixation system as claimed in claim 1, wherein: the outside both sides in main nail main part rear end are equipped with cylindric arch, and the rear end inboard is equipped with the screw thread.
5. The self-tapping nail of claim 3, wherein the self-tapping nail is adapted for use in a femoral neck low-notch internal fixation system, and comprises: the slider is wholly cylindrical, the bottom of the slider is of a plane structure, and the front end face of the slider is provided with sawtooth-shaped protrusions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211462262.0A CN115708714A (en) | 2022-11-21 | 2022-11-21 | Knock-in type self-tapping main nail suitable for low-notch internal fixing system of femoral neck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211462262.0A CN115708714A (en) | 2022-11-21 | 2022-11-21 | Knock-in type self-tapping main nail suitable for low-notch internal fixing system of femoral neck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115708714A true CN115708714A (en) | 2023-02-24 |
Family
ID=85233988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211462262.0A Pending CN115708714A (en) | 2022-11-21 | 2022-11-21 | Knock-in type self-tapping main nail suitable for low-notch internal fixing system of femoral neck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115708714A (en) |
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2022
- 2022-11-21 CN CN202211462262.0A patent/CN115708714A/en active Pending
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