CN217660085U - Local reverse thread hollow nail - Google Patents
Local reverse thread hollow nail Download PDFInfo
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- CN217660085U CN217660085U CN202220435283.2U CN202220435283U CN217660085U CN 217660085 U CN217660085 U CN 217660085U CN 202220435283 U CN202220435283 U CN 202220435283U CN 217660085 U CN217660085 U CN 217660085U
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Abstract
The utility model relates to a local anti-thread hollow nail, include: a nail body having a through hole penetrating the nail body; the first thread part is arranged at the front end of the outer part of the nail body; and a second thread part arranged at the outer middle end of the nail body, wherein the thread directions of the first thread part and the second thread part are opposite. The reverse screw thread design of increase can be more firm fixed fracture end, and the unstable factor that the effectual prevention caused because of too big pressurization to fracture section made the hollow nail take place to rotate not hard up slippage play fracture section, and the unstable phenomenon of nail is moved back because of the hollow nail rotation that the activity arouses to effective prevention in operation later stage patient effectively reaches the anticipated stable treatment effect of operation to avoid taking place all kinds of fixed unstable phenomena, effectually avoided taking place the secondary fracture.
Description
Technical Field
The utility model relates to a medical appliance, in particular to a hollow nail with partial reverse threads.
Background
The current clinical hollow nail is designed by AO (International society for internal fixation and research) as the standard. The front part of the nail body is provided with self-tapping threads, the rear part of the nail body is provided with a smooth nail body without threads, the inside of the nail body is provided with a hollow pipe cavity, and when the nail is used, an inner hexagonal screwdriver is needed to be used for pressurizing and screwing in the tail end of the nail body, and pressurizing is carried out after passing through the fracture end.
In order to facilitate easy removal of the hollow nail after bone healing, the conventional self-tapping and self-removing hollow nail is additionally provided with a screw blade at the tail part of the screw thread at the front end of the traditional pressurizing hollow nail. However, the screw edge is added at the tail part of the front end screw thread, so that the phenomena of screw withdrawal of the fracture fixing screw, unstable fixation of the fracture end and even secondary fracture are easy to occur after a patient can move from the ground.
Therefore, there is a need in the art to design a cannulated nail that effectively prevents the set screw from backing out while facilitating removal after healing of the fracture.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of the prior art, the utility model provides a local reverse-thread hollow nail. The utility model discloses a hollow nail is applicable to operations such as thighbone neck fracture internal fixation, pelvis fracture internal fixation, can effectively prevent moving back the nail, also is convenient for take out after the union of fracture simultaneously.
In order to solve the technical problem, the utility model provides a local anti-thread hollow nail, include:
a nail body having a through hole penetrating through the nail body;
the first threaded part is arranged at the front end of the outer part of the nail body; and
and the second threaded part is arranged at the middle end of the outer part of the nail body, and the thread directions of the first threaded part and the second threaded part are opposite.
Further, the thread height of the second threaded portion is lower than the thread height of the first threaded portion.
Further, the thread cutting device further comprises a self-tapping edge arranged at the rearmost end of the thread of the second thread part.
Further, the nail comprises a third thread part which is arranged at the outer rear end of the nail body and is opposite to the thread direction of the second thread part.
Further, the third threaded portion has threads of incrementally tapered pitch.
Further, the pitch of the third thread part gradually increases from the front end to the rear end.
Further, the first thread portion, the second thread portion and the third thread portion are sequentially and discontinuously disposed outside the nail body.
Further, the thread height of the third threaded portion is lower than the thread height of the second threaded portion.
Furthermore, the rear end of the nail body is of an inner hexagonal shape or a plum blossom shape.
Furthermore, the front end of the nail body is a self-tapping head.
The utility model discloses a hollow nail is applicable to femoral neck fracture, intertrochanteric fracture and pelvis fracture etc. through the design of partial reverse screw thread, when carrying out effective fixed to the fracture end, utilizes the reverse action force of reverse screw thread can effectively prevent to move back the nail. Moreover, the thread height of the reverse thread part is lower than that of the forward thread part, so that the nailing process is not hindered.
The utility model discloses a hollow nail has the screw thread portion of the gradual change pitch that scales up step by step through the setting, can eliminate the fracture end that the later stage patient in fracture took place the ground when moving easily and fix unstable phenomenon.
In addition to the technical problems addressed by the present invention, the technical features of the constituent technical solutions, and the advantages brought by the technical features of these technical solutions, which are described above, other technical features of the present invention and the advantages brought by these technical features will be further explained with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic view of a hollow nail according to a first embodiment of the present invention.
Fig. 2 is a schematic view of a hollow nail according to a second embodiment of the present invention.
In the figure:
the nail comprises a nail body 1, a self-tapping head 2, an inner hexagonal socket 3, a first thread part 4, a second thread part 5 and a third thread part 6.
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, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
In the description of the present invention, unless otherwise specified, "plurality", and "plural" mean two or more, and "several", and "several groups" mean one or more.
The utility model provides a local anti-thread hollow nail, include:
a nail body having a through hole penetrating through the nail body;
the first threaded part is arranged at the front end of the outer part of the nail body; and
and the second thread part is arranged at the middle end of the outer part of the nail body, and the thread directions of the first thread part and the second thread part are opposite.
The utility model discloses a hollow nail can adopt the design of half screw thread, and the first screw thread portion that is close to the front end is forward screw thread, is partial reverse screw thread thereafter. The half-thread design makes the utility model discloses reach better fixed effect when carrying out effectual pressurization treatment effect to the fracture end in the fracture treatment. The reverse screw thread design of increase can be more firm fixed fracture end, and effectual prevention makes the hollow nail take place rotatory not hard up slippage out of the unstable factor that the fracture section caused because of the too big pressurization to the fracture section, and the unstable phenomenon of nail is moved back in the rotation of hollow nail that effective prevention arouses because of the activity because of the later stage patient of operation, effectively reaches the expected stable treatment effect of operation to avoid taking place all kinds of fixed unstable phenomena, effectually avoided taking place the secondary fracture.
Preferably, the thread height of second screw portion is less than the thread height of first screw portion, consequently does not influence when using to fracture end pressurization self tapping screw-in, and in fracture healing middle and later stage, when the patient goes on the ground and moves about, reverse screw thread can effectively avoid fracture set screw to move back the nail and the fixed unstable problem of fracture end.
Preferably, the nail further comprises a third thread part arranged at the outer rear end of the nail body and opposite to the thread direction of the second thread part. The first thread part, the second thread part and the third thread part are sequentially and discontinuously arranged outside the nail body. Preferably, the third threaded portion has a thread with an incrementally tapered pitch. The pitch of the third thread part is gradually increased from the front end to the rear end. Preferably, the thread height of the third screw part is lower than the thread height of the second screw part.
Through the gradual change pitch design that increases gradually, make the utility model discloses carry out effectual sclerotin compression to the fracture end in fracture treatment, the fixed power of controlling of increase reaches better fixed effect.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
First embodiment
As shown in fig. 1, the hollow nail according to the first embodiment of the present invention comprises: the nail comprises a nail body 1, a self-tapping head 2, an inner hexagonal interface 3, a first threaded part 4 and a second threaded part 5.
The nail body 1 is provided with a through hole penetrating through the center, the front end of the nail body 1 is provided with a self-tapping head 2, a first thread part 4 is arranged on the outer part of the nail body 1 close to the front end, and the first thread part 4 is self-tapping self-taking forward threads. A second screw part 5 is provided at a rear portion of the first screw part 4 at a distance from the first screw part 4, and the second screw part 5 is a reverse screw. The rear end (tail) of the nail body 1 is provided with an inner hexagonal connector 3. When the implant is implanted into a fracture part, a matched hexagonal wrench can be used for screwing.
In the present embodiment, the thread height of the first thread part 4 is 1 to 2mm, preferably 1.5mm, and the pitch is 2 to 4mm, preferably 3mm. The nail body 1 has a diameter of 6mm to 8mm, preferably 7mm. The length of the nail body 1 is 65mm-95mm.
The thread height of the second thread part 5 in this embodiment is 1mm lower than the thread height of the first thread part 4. The pitch of the second threaded portion 5 is 2.5mm.
The embodiment provides a hollow nail with a self-tapping head and a self-taking cutting edge arranged at the rear end (tail part) of the reverse thread of the second thread part 5, so that the nail can be taken conveniently. The thread height of second screw portion 5 is less than the thread height of first screw portion 4, consequently does not influence when using to fracture end pressurization self tapping screw-in, and in fracture healing middle and later stage, when the patient goes on the ground and moves about, reverse screw thread can effectively avoid fracture set screw to move back the nail and the fixed unstable problem of fracture end.
The hollow nail of this embodiment is half screw thread design, is applicable to the fixed of femoral neck fracture, intertrochanteric fracture and partial pelvis fracture, reaches better fixed effect when carrying out effectual pressurization treatment to the fracture end. The fracture end can be quickly screwed in and the hollow nail can be easily taken out by the ingenious combination of the self-tapping drill and the self-tapping screw.
Second embodiment
As shown in fig. 2, the hollow nail according to the second embodiment of the present invention comprises: the self-tapping screw comprises a screw body 1, a self-tapping head 2, an inner hexagonal socket 3, a first threaded part 4, a second threaded part 5 and a third threaded part 6.
The nail body 1 has a through hole penetrating through the center, the front end of the nail body 1 is provided with a self-tapping head 2, a first thread part 4 is arranged on the outside of the nail body 1 close to the front end, and the first thread part 4 is self-tapping constant-pitch positive thread. A second screw part 5 is provided at a rear portion of the first screw part 4 at a distance from the first screw part 4, and the second screw part 5 is a constant pitch reverse screw. A third screw part 6 is provided at a rear part of the second screw part 5 at a distance from the second screw part 5, and the third screw part 6 is a normal screw. The third threaded portion 6 is a self-tapping, progressively increasing pitch thread. The rear end (tail) of the nail body 1 is provided with an inner hexagonal interface 3. When the implant is implanted into a fracture part, a matched hexagonal wrench can be used for screwing.
In the present embodiment, the thread height of the first thread part 4 is 1 to 2mm, preferably 1.5mm, and the pitch is 2 to 4mm, preferably 3mm. The nail body 1 has a diameter of 6mm to 8mm, preferably 7mm. The length of the nail body 1 is 135mm-165mm.
The thread height of the second thread part 5 in this embodiment is 1mm lower than the thread height of the first thread part 4. The pitch of the second threaded portion 5 is 2.5mm.
The thread height of the third thread part 6 is 0.8mm lower than that of the second thread part 5. The pitch of the third thread part 6 is an increasing pitch which gradually increases from front to back, and the pitch gradually increases from 2mm to 5mm.
The hollow nail of the utility model is a full thread hollow nail, which is applicable to the fixation of pelvis fracture. The fracture end can be quickly screwed in and the hollow nail can be easily taken out by the ingenious combination of self-tapping and self-taking threads of the self-tapping drill. The design of gradually increasing the thread pitch plays a role in effectively compressing the bone on the fracture section and increasing the holding force of the nail body on the bone in the fracture treatment process, so that the fracture section is tightly connected. The reverse screw thread design of increase can be more firm fixed fracture end, and the unstable factor that effectual prevention caused because of too big pressurization messenger hollow nail takes place rotatory not hard up slippage play fracture section to the fracture section, and the hollow nail rotation that effective prevention arouses because of the activity because of the operation later stage patient moves back nail unstable phenomenon.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A partial reverse-threaded cannulated nail, comprising:
a nail body having a through hole penetrating the nail body;
the first thread part is arranged at the front end of the outer part of the nail body; and
and the second thread part is arranged at the middle end of the outer part of the nail body, and the thread directions of the first thread part and the second thread part are opposite.
2. The partial reverse threaded cannulated nail of claim 1, wherein the thread height of the second threaded portion is lower than the thread height of the first threaded portion.
3. The partial reverse thread cannulated nail of claim 2, further comprising a self-tapping edge disposed at a thread trailing end of the second threaded portion.
4. The partial reverse threaded cannulated nail of claim 1, further comprising a third threaded portion disposed at the outer, rearward end of the nail body opposite the threading direction of the second threaded portion.
5. The partial reverse threaded cannulated nail of claim 4, wherein the third threaded portion has a thread of incrementally varying pitch.
6. The partial reverse thread cannulated nail of claim 5, wherein the thread pitch of the third threaded portion increases from the front end to the rear end.
7. The partial reverse thread cannulated nail of claim 4, wherein the first, second and third threaded portions are sequentially and discontinuously disposed outside of the nail body.
8. The partial reverse threaded cannulated nail of claim 4, wherein the thread height of the third threaded portion is lower than the thread height of the second threaded portion.
9. The hollow, partial reverse threaded nail of claim 1, wherein the rear end of the nail body is of the hexagon socket type or quincunx type.
10. The partial reverse-threaded cannulated nail of claim 1, wherein the leading end of the nail body is a self-tapping head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220435283.2U CN217660085U (en) | 2022-03-01 | 2022-03-01 | Local reverse thread hollow nail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220435283.2U CN217660085U (en) | 2022-03-01 | 2022-03-01 | Local reverse thread hollow nail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217660085U true CN217660085U (en) | 2022-10-28 |
Family
ID=83731105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220435283.2U Active CN217660085U (en) | 2022-03-01 | 2022-03-01 | Local reverse thread hollow nail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217660085U (en) |
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2022
- 2022-03-01 CN CN202220435283.2U patent/CN217660085U/en active Active
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