CN218832859U - Knock-in self-tapping main nail suitable for low-incisura internal fixation system of femoral neck - Google Patents
Knock-in self-tapping main nail suitable for low-incisura internal fixation system of femoral neck Download PDFInfo
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- CN218832859U CN218832859U CN202223091517.5U CN202223091517U CN218832859U CN 218832859 U CN218832859 U CN 218832859U CN 202223091517 U CN202223091517 U CN 202223091517U CN 218832859 U CN218832859 U CN 218832859U
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Abstract
The utility model discloses a formula of pounding self tapping owner nail suitable for low notch internal fixation system of thighbone neck, including the self tapping blade, the self tapping blade is whole cylindricly, self tapping blade rear end is spacing to be installed in the owner nail main part through spacing screw, the inside hollow structure that is of owner nail main part is equipped with the installation space that supplies guide pin and anti screw to pass, open on main nail main part upper portion has the guide opening, guide opening and installation space intercommunication, installation space internally mounted has the slider, self tapping blade and the inside guide pin hole that opens of slider. 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 utility model relates to a self tapping owner nail technical field, concretely relates to knock-in self tapping owner nail suitable for low notch internal fixation system of thighbone neck.
Background
The Switzerland Depuy Synthes company develops a novel Femur Neck internal fixation System (FNS), which consists of a sliding sleeve, a power rod, an anti-rotation screw and a locking screw, has small operation 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 the simulation analysis result indicates that the FNS main nail mainly bears the vertical shearing force of the fracture broken end, and meanwhile, because the FNS main nail has a limiting recess, a large amount of stress is concentrated at the recess due to sudden shape change, and the main nail is easy to break and fail due to long-term stress circulation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a knock-in self tapping main nail suitable for low notch internal fixation system of thighbone neck to solve the problem that mentions in the background art. In order to achieve the above purpose, the utility model provides a 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 utility model discloses a technological effect and advantage: the self-tapping main nail is matched with the low-incisura sliding sleeve, drilling is not needed through an electric drill, only the outer cortex of the proximal end of the femur is drilled through the electric drill, the bone mass is less lost, the self-tapping main nail is safer for the old and patients with osteoporosis, and the risk of fracture and non-union of the femoral neck after operation is less. 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, and adopts the convex limit design, so that the shearing capacity is better, and the fracture risk is smaller.
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 view of the operation of the present invention.
In the figure: 1-self-tapping blade, 2-self-tapping cutter head, 3-mounting end, 4-annular recess, 5-limiting screw, 6-main nail body, 7-anti-rotation screw, 8-guiding opening, 9-cylindrical protrusion, 10-sleeve, 11-sliding block, 12-guide pin hole and 13-sawtooth protrusion.
Detailed Description
In order to make the technical means, the creative features, the objectives and the functions of the present invention easily understood and appreciated, the present invention will be further described with reference to the specific drawings, and in the description of the present invention, unless otherwise specified or limited, the terms "mounted," connected "and" connected "should be understood broadly, and for example, the terms" fixed connection, "detachable connection," integral connection, mechanical connection, and electrical connection may be used; 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 bulges 9 which are matched with a 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 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 up, 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 self-tapping blade 1 through the saw-toothed protrusions 13, so that the self-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 utility model discloses process flow and theory of operation do: 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, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (5)
1. The utility model provides a knock-in self tapping staple suitable for low notch internal fixation system of thighbone neck, includes self tapping blade, its characterized in that: the self tapping blade is whole cylindricly, the self tapping blade rear end is spacing to be installed in the main nail main part through 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, open on main nail main part upper portion has the guide mouth, guide mouth and installation space intercommunication, installation space internally mounted has the slider, the inside guide pin hole that opens of self tapping blade and slider.
2. The self-tapping nail of claim 1, wherein the self-tapping nail is adapted for use in a femoral neck low-notch internal fixation system, and comprises: the self tapping blade includes the self tapping tool bit, the installation end is connected to the 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 the knock-in type suitable for the femoral neck low-notch internal fixation system as claimed in claim 2, wherein: the rear end face of the mounting end is provided with a sawtooth-shaped bulge.
4. The self-tapping nail of claim 1, wherein the self-tapping nail is adapted for use in a femoral neck low-notch internal fixation system, and comprises: the outside both sides of 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 |
|---|---|---|---|
| CN202223091517.5U CN218832859U (en) | 2022-11-21 | 2022-11-21 | Knock-in self-tapping main nail suitable for low-incisura internal fixation system of femoral neck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223091517.5U CN218832859U (en) | 2022-11-21 | 2022-11-21 | Knock-in self-tapping main nail suitable for low-incisura internal fixation system of femoral neck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218832859U true CN218832859U (en) | 2023-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223091517.5U Active CN218832859U (en) | 2022-11-21 | 2022-11-21 | Knock-in self-tapping main nail suitable for low-incisura internal fixation system of femoral neck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218832859U (en) |
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2022
- 2022-11-21 CN CN202223091517.5U patent/CN218832859U/en active Active
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