Front end connecting structure of hollow bone nail

Abstract

The utility model discloses a front end connecting structure of a hollow bone nail, which comprises a hollow bone nail component, and the hollow bone nail component comprises a hollow bone nail main body, a screw rod arranged at the front end of the hollow bone nail main body and a tapping head connected with the screw rod; the connecting assembly comprises an external thread cylinder communicated with the screw rod, an internal thread formed in the inner side of the hollow bone nail main body, a cylinder communicated with the external thread cylinder, a circular notch formed in the surface of the cylinder, a stepped hole formed in the outer surface of the hollow bone nail main body and a threaded hole formed in the stepped hole. Through mutual matching of the hollow bone nail assembly and the connecting assembly, the hollow bone nail forms a split type structural design and the tapping head and the bone nail main body are separated during use, so that a user can conveniently select the suitable tapping head at will, the bone nail does not need to be integrally replaced when the bone nail is sunken, and the cost is reduced. And any assembly can be used, so that the use cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bone screws, in particular to a front end connection structure of a hollow bone screw. Background Art

[0002] The design feature of the hollow bone screw lies in its "hollow" structure. This design not only reduces the weight of the bone screw, but also reduces the difficulty of surgical operation and improves surgical efficiency. Another advantage of this hollow design is that it can apply tension (traction) to the skeletal system through the skin, thereby better fixing the fracture. The top tapping head of the hollow bone screw is integrally formed. During the use of such a structural design, once the entire hollow bone screw has a dent or slipped thread at any position, the entire bone screw needs to be replaced, which results in a relatively high cost of use. Utility Model Content

[0003] Therefore, the purpose of the utility model is to provide a front end connection structure of a hollow bone screw. By cooperating with the hollow bone screw assembly and the connection assembly, the hollow bone screw forms a split structural design when in use, and the tapping head and the bone screw body are designed to be separated. This not only makes it convenient for users to arbitrarily select a suitable tapping head, but also when the bone screw becomes dented, there is no need to replace the entire thing, and it can be used by any assembly, thereby reducing the cost of use.

[0004] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: a front end connection structure of a hollow bone screw, comprising:

[0005] A hollow bone screw assembly, the hollow bone screw assembly comprising a hollow bone screw body, a spiral rod arranged at the front end of the hollow bone screw body, and a tapping head connected to the spiral rod;

[0006] A connecting assembly, the connecting assembly includes an external threaded cylinder connected to the spiral rod, an internal thread provided on the inner side of the hollow bone screw body, a cylinder connected to the external threaded cylinder, a circular notch provided on the surface of the cylinder, a step hole provided on the outer surface of the hollow bone screw body, and a threaded hole provided in the step hole.

[0007] As a preferred solution of the front end connection structure of the hollow bone screw described in the utility model, the connection assembly further includes a threaded column arranged on the outside of the hollow bone screw body and a square opening opened at the top end of the threaded column.

[0008] As a preferred solution of the front end connection structure of the hollow bone screw described in the utility model, the threaded column and the threaded hole are connected to each other, and the end of the threaded column is inserted into the circular groove.

[0009] As a preferred solution of the front end connection structure of the hollow bone screw described in the utility model, the top end of the threaded column is embedded in the step hole, and the top end of the threaded column is flush with the outer side surface of the hollow bone screw body.

[0010] As a preferred solution of the front end connection structure of the hollow bone screw described in the utility model, wherein the circular notches are provided with three, and the three circular notches are distributed in an annular manner;

[0011] Wherein, each circular notch is provided with a corresponding threaded column.

[0012] As a preferred solution of the front end connection structure of the hollow bone screw described in the utility model, it also includes a tapered cylinder, and the tapered cylinder is fixed on the top end of the cylinder.

[0013] Compared with the prior art, the advantages of the utility model are:

[0014] 1. The utility model achieves a split structural design of the hollow bone screw when in use by cooperating with the hollow bone screw assembly and the connecting assembly, in which the tapping head and the bone screw body are separated. This not only facilitates the user to arbitrarily select a suitable tapping head, but also, when the bone screw becomes dented, there is no need to replace the entire thing, and the bone screw can be used after any assembly, thereby reducing the cost of use.

[0015] 2. Based on the first beneficial effect, the conical tube is provided to make the connection between the hollow bone screw body and the spiral rod present a slope design, so that the hollow bone screw body and the inside of the spiral rod are made flush as much as possible, thereby reducing the connection drop between the hollow bone screw body and the inside of the spiral rod and improving the flatness.

[0016] During specific use, the user connects the external threaded tube with the internal thread in the hollow bone screw body. After the connection is completed, the user uses a square rod to insert it into the square opening, and rotates the square rod to connect the threaded column and the threaded hole to each other until the end of the threaded column is stuck in the circular groove opening. At this time, the top of the threaded column is embedded in the step hole, and the top of the threaded column is flush with the outer side surface of the hollow bone screw body. After such connection, when the tapping head is in use, the tapping head is limited, the thread will not rotate idly, and it can be replaced at will. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the implementation of the utility model, the utility model will be described in detail below in combination with the drawings and detailed implementation. Obviously, the drawings described below are only some implementations of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0018] Figure 1It is a structural diagram of the utility model;

[0019] Figure 2 This is a structural diagram of the connection assembly of the utility model;

[0020] Figure 3 This is a structural diagram of the threaded column of the utility model;

[0021] Figure 4 It is a cross-sectional view of the conical cylinder of the utility model.

[0022] In the figure: 11, hollow bone screw body; 12, spiral rod; 13, tapping head; 21, external threaded cylinder; 22, internal thread; 23, cylinder; 24, round groove; 25, threaded column; 26, square mouth; 27, step hole; 28, threaded hole; 30, tapered cylinder. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation methods disclosed below.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] The utility model provides a front end connection structure of a hollow bone screw. By cooperating with each other, the hollow bone screw component and the connection component are arranged, so that when in use, the hollow bone screw forms a split structural design, and the tapping head and the bone screw body are designed to be separated. This not only facilitates the user to arbitrarily select a suitable tapping head, but also does not need to be replaced as a whole when the bone screw is dented. It can be used by any assembly, thereby reducing the cost of use.

[0028] Figure 1-Figure 4 The figure shows the overall structure of a front end connection structure of a hollow bone screw according to the present invention. Figure 1-Figure 4The main structure of this embodiment includes: a hollow bone screw assembly and a connecting assembly.

[0029] The hollow bone screw assembly and the connecting assembly are used in combination. Specifically, the hollow bone screw assembly includes a hollow bone screw body 11, a spiral rod 12 arranged at the front end of the hollow bone screw body 11 and a tapping head 13 connected to the spiral rod 12; the connecting assembly includes an external threaded barrel 21 connected to the spiral rod 12, an internal thread 22 opened on the inner side of the hollow bone screw body 11, a cylinder 23 connected to the external threaded barrel 21, a circular groove 24 opened on the surface of the cylinder 23, a step hole 27 opened on the outer surface of the hollow bone screw body 11, and a threaded hole 28 opened in the step hole 27.

[0030] During specific use, the user connects the external threaded tube 21 with the internal thread 22 in the hollow bone screw body 11. After the connection is completed, the user uses a square rod to insert it into the square opening 26, and rotates the square rod to connect the threaded column 25 with the threaded hole 28 until the end of the threaded column 25 is stuck in the circular groove opening 24. At this time, the top of the threaded column 25 is embedded in the step hole 27, and the top of the threaded column 25 is flush with the outer side of the hollow bone screw body 11. After such connection, when the tapping head 13 is in use, the tapping head 13 is limited, the thread will not rotate idly, and it can be replaced at will.

[0031] Furthermore, by providing the tapered tube 30, the connection between the hollow bone screw body 11 and the spiral rod 12 is designed to be sloped, so that the hollow bone screw body 11 and the inside of the spiral rod 12 are flush as much as possible, thereby reducing the connection drop between the hollow bone screw body 11 and the inside of the spiral rod 12 and improving the flatness;

[0032] Specifically, it also includes a conical cylinder 30, which is fixed on the top of the cylinder 23;

[0033] During actual use, the conical tube 30 is designed to have a sloped structure, with thickness gradually decreasing from bottom to top, thereby reducing the connection drop and making the interior of the hollow bone screw body 11 as flat as possible.

[0034] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A front end connection structure of a hollow bone screw, characterized in that: include: A hollow bone screw assembly, comprising a hollow bone screw body (11), a spiral rod (12) arranged at the front end of the hollow bone screw body (11), and a tapping head (13) connected to the spiral rod (12); A connecting assembly, the connecting assembly comprising an externally threaded cylinder (21) connected to the spiral rod (12), an internal thread (22) provided on the inner side of the hollow bone screw body (11), a cylinder (23) connected to the externally threaded cylinder (21), a circular notch (24) provided on the surface of the cylinder (23), a stepped hole (27) provided on the outer surface of the hollow bone screw body (11), and a threaded hole (28) provided in the stepped hole (27).

2. The front end connection structure of a hollow bone screw according to claim 1, characterized in that: The connection assembly further comprises a threaded column (25) arranged on the outside of the hollow bone screw body (11) and a square opening (26) opened at the top of the threaded column (25).

3. The front end connection structure of a hollow bone screw according to claim 2, characterized in that: The threaded column (25) and the threaded hole (28) are connected to each other, and the end of the threaded column (25) is inserted into the circular groove (24).

4. The front end connection structure of a hollow bone screw according to claim 3, characterized in that: The top end of the threaded column (25) is embedded in the stepped hole (27), and the top end of the threaded column (25) is flush with the outer side surface of the hollow bone screw body (11).

5. The front end connection structure of a hollow bone screw according to claim 4, characterized in that: The circular notches (24) are provided in three numbers, and the three circular notches (24) are distributed in an annular manner; Wherein, each circular notch (24) is provided with a corresponding threaded column (25).

6. The front end connection structure of a hollow bone screw according to claim 5, characterized in that: It also includes a conical cylinder (30), which is fixed on the top end of the cylinder (23).

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