CN215425024U - Screw locking internal fixing system - Google Patents
Screw locking internal fixing system Download PDFInfo
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- CN215425024U CN215425024U CN202120167435.0U CN202120167435U CN215425024U CN 215425024 U CN215425024 U CN 215425024U CN 202120167435 U CN202120167435 U CN 202120167435U CN 215425024 U CN215425024 U CN 215425024U
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Abstract
The present invention provides a screw locking internal fixation system, comprising: the bone plate is provided with a through locking hole, and the side wall of the locking hole is provided with a nail pressing hole; the locking screw is provided with a screw head and a screw body, the screw head is provided with a side opening, and the screw body penetrates through the locking hole and extends into a bone; the nail pressing device comprises a nail pressing head and a nail body, wherein the size of the nail pressing head is larger than that of the side opening, and the nail body penetrates through the side opening and is fixed in the nail pressing hole. The locking screw of the screw locking internal fixing system is not easy to loosen and withdraw in the bone plate, and the compression screw is arranged in the bone plate, so that the bone fracture fixation system does not increase the trauma to the bone, and is particularly suitable for the internal fixing system with a larger included angle between the axis of the locking hole and the longitudinal axis of the bone plate; in addition, it conforms to the low-notch design concept.
Description
Technical Field
The utility model relates to the field of medical instruments, in particular to a screw locking internal fixing system.
Background
The bone plate and the bone nail are often matched in treatment of fracture or bone defect, the locking strength of the traditional locking mode is insufficient, only partial threads are used for completing locking, large-angle screws are needed to be matched with the bone plate for use for the bone plate at some parts, the locking of the screws and the bone plate cannot meet the requirement of the locking strength, and the locking effect is not much different from that of a leather nail. In addition, the existing screw locking notch is too high and does not accord with the existing low notch concept.
Therefore, a screw locking internal fixation system having both high locking strength and low notch becomes a key to the problem.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a screw locking internal fixing system, which is characterized in that a locking screw is not easy to loosen and withdraw in a bone plate, and a compression screw is arranged in the bone plate, so that the bone plate cannot be injured by the compression screw, and is particularly suitable for the internal fixing system with a larger included angle between the axis of a locking hole and the longitudinal axis of the bone plate.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a screw-locking internal fixation system, comprising:
the bone plate is provided with a through locking hole, and the side wall of the locking hole is provided with a nail pressing hole;
the locking screw is provided with a screw head and a screw body, the screw head is provided with a side opening, and the screw body penetrates through the locking hole and extends into a bone;
the nail pressing device comprises a nail pressing head and a nail body, wherein the size of the nail pressing head is larger than that of the side opening, and the nail body penetrates through the side opening and is fixed in the nail pressing hole.
Further, the included angle between the axis of the locking hole and the longitudinal axis of the bone plate is 10-50 degrees.
Furthermore, the included angle between the axis of the nail pressing hole and the axis of the locking hole is 80-100 degrees; the included angle formed by the axis of the side opening and the axis of the locking screw is equal to the included angle formed by the axis of the locking hole and the axis of the nail pressing hole.
Furthermore, the nail pressing hole is a blind hole, and the length of the nail body is less than or equal to the depth of the nail pressing hole.
Further, the locking hole is provided with a first internal thread, and the nail head is provided with a first external thread matched with the first internal thread.
Further, the nail body is provided with the second external screw thread, and the pressure nail hole is provided with the second internal thread, nail body and pressure nail hole threaded connection.
Furthermore, a third external thread is arranged on the periphery of the nail body of the locking screw, and the thread depth of the third external thread is larger than that of the first external thread.
Furthermore, the nail head is provided with a first instrument connecting groove, and the side opening is arranged on the side wall of the first instrument connecting groove.
Further, the first instrument attachment slot is provided with a chamfer on an opposite side of the side aperture for reducing the locking notch of the locking screw.
Further, a second instrument connecting groove is arranged on the nail cap.
Compared with the prior art, the utility model has the beneficial effects that:
according to the screw locking internal fixing system provided by the utility model, the locking screw is fixed in the bone plate by the compression screw, so that the locking screw is not easy to loosen and withdraw, and the compression screw is arranged in the bone plate, so that the bone injury cannot be increased, and the screw locking internal fixing system is particularly suitable for the internal fixing system with a larger included angle between the axis of the locking hole and the longitudinal axis of the bone plate;
the screw of the screw locking internal fixing system provided by the utility model is designed with low notch, and accords with the current low notch design concept.
Drawings
Fig. 1 is a sectional view of a screw locking internal fixation system provided in one embodiment of the present invention.
Fig. 2 is a cross-sectional view of a bone plate provided in one embodiment of the present invention.
Fig. 3 is a perspective view of a locking screw provided in one embodiment of the present invention.
Fig. 4 is a perspective view of a press stud according to an embodiment of the present invention.
Wherein: 110-a bone plate; 111-locking holes; 111 a-first internal thread; 112-pressing nail holes; 112 a-second internal thread;
120-a locking screw; 121-nail head; 121 a-first external thread; 122-a nail body; 122 a-third external thread; 123-a first inner hexagonal groove; 124-side opening; 125-chamfer plane;
130-pressing nails; 131-a nail cap; 132-a nail body; 132 a-a second external thread; 133-second inner hexagonal groove.
The included angle is formed between the axis of the alpha-locking hole and the axis of the nail pressing hole;
the included angle is formed between the axis of the beta-side opening and the longitudinal axis of the locking screw;
the axis of the theta-lock hole is angled with respect to the longitudinal axis of the bone plate.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
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, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 by those of ordinary skill in the art through specific situations.
Aiming at the technical problems of insufficient screw thread connection locking strength of a screw and a bone plate and higher incisional track after the screw is connected with the bone plate in the prior art, the utility model provides a screw locking internal fixation system, which comprises:
the bone plate is provided with a through locking hole, and the side wall of the locking hole is provided with a nail pressing hole;
the locking screw is provided with a screw head and a screw body, the screw head is provided with a side opening, and the screw body penetrates through the locking hole and extends into a bone;
the nail pressing device comprises a nail pressing head and a nail body, wherein the size of the nail pressing head is larger than that of the side opening, and the nail body penetrates through the side opening and is fixed in the nail pressing hole.
The screw locking internal fixing system is characterized in that the head of the locking screw is arranged in the locking hole of the bone plate and is fixed by the compression screw, so that the locking screw is not easy to loosen and withdraw; and because the compression nail is only fixed in the bone plate and does not extend into the bone, the screw locking internal fixing system can not increase the trauma to the bone; the screw locking internal fixation system is particularly suitable for internal fixation systems with large included angles between the axes of the locking holes and the longitudinal axis of the bone plate; the screw locking internal fixation system is particularly suitable for screw locking internal fixation systems with the included angle between the axis of the locking hole and the longitudinal axis of the bone plate being 10-50 degrees, for example, the included angle between the axis of the locking hole and the longitudinal axis of the bone plate is 15 degrees, 25 degrees, 32 degrees, 35 degrees, 40 degrees or 45 degrees, and the like, and the pressing nail fixing locking screw can be used under the conditions of other angles such as 60 degrees, 70 degrees or 80 degrees, but the inclination angle of the locking screw is smaller at the moment, the locking screw and the locking hole of the bone plate are matched and relatively fastened through threads, and the pressing nail fixing locking screw is not needed. The size of the screw cap is larger than that of the side opening to ensure that the pressing screw does not penetrate through the side opening, so that the function of fixing the locking screw by the pressing screw is prevented from being lost; the outer surface of the nail cap can be provided with threads or not, and the side hole can be a smooth hole.
Further, in order to ensure the fixing effect of the pressing nail on the locking screw, the included angle between the axis of the pressing nail hole and the axis of the locking hole is preferably 80-100 degrees, such as 85 degrees, 88 degrees, 90 degrees, 95 degrees, 98 degrees and the like; and the angle formed by the axis of the side opening and the longitudinal axis of the locking screw is preferably equal to the angle formed by the axis of the locking hole and the axis of the nail pressing hole, so that the nail pressing and the locking screw can be smoothly implanted into the nail pressing hole and the locking hole.
In order to ensure the strength of the bone plate and achieve the fixing effect of the locking screw, the nail pressing hole is a blind hole, and in addition, in order to facilitate and fast the nail pressing implantation, the length of the nail body is less than or equal to the depth of the nail pressing hole.
The locking hole may be a smooth or threaded hole, and in order to further enhance the fixation of the locking screw in the bone plate and prevent the screw from backing out, the locking hole is provided with a first internal thread and the head is provided with a first external thread cooperating with the first internal thread.
The pressure nail is fixed in pressing the nail hole, and its fixed mode can be multiple, and for operation and production and processing convenience in the operation, the pressure nail is preferably threaded connection with being connected in pressing the nail hole, and the nail body is provided with the second external screw thread promptly, presses the nail hole to be provided with the second internal thread, nail body and pressure nail hole threaded connection.
Further, in order to improve the fixing strength of the locking screw in the bone, a third external thread is arranged on the periphery of the screw body of the locking screw, and the thread depth of the third external thread is greater than that of the first external thread.
Furthermore, the nail head is provided with a first instrument connecting groove, and the side opening is arranged on the side wall of the first instrument connecting groove. The first instrument connecting groove is used for being connected with an instrument when the locking screw is implanted, so that the holding and the implantation of the locking screw are facilitated. The type of the first instrument connecting groove can be hexagonal, square, triangular, quincunx and the like, and a person skilled in the art can determine the hole type of the first instrument connecting groove according to actual needs.
Further, to reduce the locking screw notch, the first instrument attachment slot is provided with a chamfered surface on an opposite side of the side aperture for reducing the locking screw notch. The bone plate with smaller thickness is used in the bone surgery, when the included angle between the axis of the locking hole and the longitudinal axis of the bone plate is larger, the nail head is easily exposed outside the bone after the locking screw and the bone plate are locked, the incisure is higher, and in order to reduce the incisure, part of the nail head is cut off, so that after the locking screw and the bone plate are locked, the nail head is not exposed outside the bone plate, and a low-incisure screw locking internal fixing system is formed to accord with the current low-incisure design concept.
Furthermore, a second instrument connecting groove is formed in the nail cap, so that the holding and taking of the pressing nail and the locking screw during connection are facilitated; the type of the second instrument connecting groove can be hexagonal, square, triangular, quincunx and the like, and a person skilled in the art can determine the hole pattern of the first instrument connecting groove according to actual needs.
In particular, as shown in fig. 1 to 4, in one form of realisation of the present invention, the screw-locking internal fixation system 1 comprises:
the bone plate 110 is provided with a through locking hole 111, a stapling hole 112 is provided on a side wall of the locking hole 111, and a first internal thread 111a and a second internal thread 112a are provided on inner walls of the locking hole 111 and the stapling hole 112, respectively. Preferably, the included angle formed by the axis of the locking hole and the longitudinal axis of the bone plate is theta, the angle of theta is 10-50 degrees, the included angle formed by the axis of the locking hole and the axis of the nail pressing hole is alpha, and the angle of alpha is 80-100 degrees. Further preferably, the angle formed by the axis of the locking hole and the axis of the clinch hole is 90 °.
The locking screw 120 has a head 121 and a body 122, and a first external thread 121a matching with the first internal thread 111a is provided on the outer circumference of the head 121 for connecting the bone to the bone plate. The first inner hexagonal groove 123 is axially disposed at the stud 121, a side opening 124 is disposed on a side wall of the first inner hexagonal groove 123, and the first inner hexagonal groove 123 is used for cooperating with a wrench to rotate the locking screw. An included angle formed by the axis of the side opening and the longitudinal axis of the locking screw is beta, and the angle of the beta is equal to the angle of the alpha. It is further preferred that the axis of the side aperture is angled 90 from the longitudinal axis of the locking screw.
The press nail 130 is provided with a nail cap 131 and a nail body 132, a second external thread 132a matched with the second internal thread 112a is arranged on the periphery of the nail body 132, and the nail body 132 penetrates through the side hole 124 and extends into the press nail hole 112 to lock the locking screw 120. Preferably, the outer diameter of the nail cap 131 is larger than the diameter of the side hole 124, and the length of the nail body 132 is smaller than or equal to the depth of the nail pressing hole 112.
In use, the angle theta formed by the axis of the locking hole and the longitudinal axis of the bone plate and the angle alpha formed by the axis of the locking hole and the axis of the compression nail hole are determined according to specific conditions, then the locking hole 111 and the compression nail hole 112 are arranged on the bone plate 110 according to the angle, and then the side hole 124 is arranged on the locking screw 120 according to the angle of the angle alpha. Then the bone plate 110 is placed on the affected part, the locking screw 120 is implanted along the axis of the locking hole 111, after the locking screw 120 is implanted, the compression nail 130 is implanted, and the locking of the locking screw 120 is realized by the compression nail 130.
In another embodiment, the locking hole 111 and the stapling hole 112 are at a 90 ° angle.
In another embodiment, the nail pressing hole 112 is a blind hole, the outer diameter of the nail cap 131 is larger than the diameter of the side hole 124, and the length of the nail body 132 is smaller than or equal to the hole depth of the nail pressing hole 112.
In another embodiment, a third external thread 122a is provided on the outer circumference of the shank 122 of the locking screw 120, and the thread depth of the third external thread 122a is greater than that of the first external thread 121 a.
In another embodiment, a chamfered surface 125 for lowering the locking notch of the locking screw is provided on the opposite side of the side aperture 124.
In another embodiment, a second hexagonal socket 133 is axially disposed at the nut 131.
In summary, the screw locking internal fixation system 1 provided by the present invention is provided with the compression screw, which can lock the locking screw, and reduce the risk of loosening and withdrawing, and the compression screw is placed in the bone plate, so that the fixation of the locking screw can be realized on the premise of not increasing the trauma to the bone, and the screw locking internal fixation system is particularly suitable for the screw locking internal fixation system with a large included angle between the axis of the locking hole and the longitudinal axis of the bone plate; in addition, the opposite side of the side opening is provided with a chamfer surface for reducing the locking notch of the locking screw, so that the screw locking internal fixing system conforms to the design concept of low notch.
While embodiments of the utility model have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the utility model pertains, and further modifications may readily be made by those skilled in the art, it being understood that the utility model is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. A screw-locking internal fixation system, comprising: the method comprises the following steps:
the bone plate is provided with a through locking hole, and the side wall of the locking hole is provided with a nail pressing hole;
the locking screw is provided with a screw head and a screw body, the screw head is provided with a side opening, and the screw body penetrates through the locking hole and extends into a bone;
the nail pressing device comprises a nail pressing head and a nail body, wherein the size of the nail pressing head is larger than that of the side opening, and the nail body penetrates through the side opening and is fixed in the nail pressing hole.
2. The screw locking internal fixation system of claim 1, wherein: the included angle between the axis of the locking hole and the longitudinal axis of the bone plate is 10-50 degrees.
3. The screw locking internal fixation system of claim 1, wherein: the included angle between the axis of the nail pressing hole and the axis of the locking hole is 80-100 degrees; the included angle formed by the axis of the side opening and the longitudinal axis of the locking screw is equal to the included angle formed by the axis of the locking hole and the axis of the pressing nail hole.
4. The screw locking internal fixation system of claim 1, wherein: the nail pressing hole is a blind hole, and the length of the nail body is less than or equal to the depth of the nail pressing hole.
5. The screw locking internal fixation system of claim 1, wherein: the locking hole is provided with a first internal thread, and the pin head is provided with a first external thread matched with the first internal thread.
6. The screw locking internal fixation system of claim 1, wherein the shank is provided with a second external thread, the head hole is provided with a second internal thread, and the shank is threadedly connected to the head hole.
7. The screw locking internal fixation system of claim 1, wherein: and a third external thread is arranged on the periphery of the nail body of the locking screw, and the thread depth of the third external thread is greater than that of the first external thread.
8. The screw locking internal fixation system of claim 1 or 2, wherein: the pin head is provided with a first instrument connecting groove, and the side opening is formed in the side wall of the first instrument connecting groove.
9. The screw locking internal fixation system of claim 8, wherein: and the first instrument connecting groove is provided with a chamfer surface used for reducing the locking notch of the locking screw at the opposite side of the side opening.
10. The screw locking internal fixation system of claim 1 or 2, wherein: the nail cap is provided with a second instrument connecting groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120167435.0U CN215425024U (en) | 2021-01-21 | 2021-01-21 | Screw locking internal fixing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120167435.0U CN215425024U (en) | 2021-01-21 | 2021-01-21 | Screw locking internal fixing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215425024U true CN215425024U (en) | 2022-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120167435.0U Active CN215425024U (en) | 2021-01-21 | 2021-01-21 | Screw locking internal fixing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215425024U (en) |
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2021
- 2021-01-21 CN CN202120167435.0U patent/CN215425024U/en active Active
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