Self-expansion bone screw

Abstract

The utility model discloses a self-expansion type bone screw which comprises an expansion bone screw body in threaded connection with a steel plate, and at least part of the expansion bone screw body extends into sclerotin; the expansion gaps are formed in one end, extending into the bone, of the expansion bone screw, and the two expansion gaps are formed in the expansion bone screw at intervals; the inner column hole is formed in the expansion bone screw; the inner taper hole is formed in the expansion bone screw, and the inner taper hole is communicated with the inner column hole; and the jackscrew is movably arranged in the inner column hole. The jackscrew enters the inner taper hole, the jackscrew extrudes the end, extending into the bone, of the expansion bone screw through the inner wall face of the inner taper hole, the expansion bone screw is forced to be exploded along the expansion gap, the connection force between the expansion bone screw and the bone is enhanced, and after the end, extending into the bone, of the expansion bone screw is exploded, a similar inverted-T-shaped structure is formed. The inverted-T-shaped structure can effectively prevent the expansion bone screw from being disengaged from sclerotin, and failure of the expansion bone screw is avoided.

Description

Technical Field

[0001] This utility model relates to the field of bone screw technology, specifically a self-expanding bone screw. Background Technology

[0002] Bone screws, as common surgical implants in clinical practice, primarily function to connect steel plates to the bone during post-operative fixation of fracture patients, thus bearing the stress on the bone. However, in daily life, during the healing and recovery period of fracture patients with steel plates, the relatively complex stress on the plates makes them susceptible to external forces and long-term corrosion from the body, leading to bone screw failure. This is especially true for patients with osteoporosis. Utility Model Content

[0003] The technical problem to be solved by this utility model is: to provide a self-expanding bone screw to solve the problem that existing bone screws are prone to failure due to external forces and long-term corrosion in the body.

[0004] The technical solution adopted by this utility model to solve the technical problem of the device is: a self-expanding bone screw, comprising: an expanding bone screw, the expanding bone screw being screwed to a steel plate, the expanding bone screw at least partially extending into the bone; at least two expansion seams, the expanding bone screw having an expansion seam at one end extending into the bone, the two expansion seams being spaced apart from each other on the expanding bone screw; an inner cylindrical hole, the inner cylindrical hole being disposed in the expanding bone screw; an inner conical hole, the inner conical hole being disposed in the expanding bone screw, the inner conical hole communicating with the inner cylindrical hole; and a setter, the setter being movably disposed in the inner cylindrical hole.

[0005] The beneficial effects of this invention are as follows: By screwing in the expansion screw, the expansion screw abuts the steel plate against the bone. At this time, the set screw is inserted into the inner conical hole and pressed down, so that the set screw enters the inner conical hole. As the cross-sectional area of ​​the inner conical hole gradually decreases, as the set screw goes deeper, the set screw squeezes the end of the expansion screw that extends into the bone through the inner wall of the inner conical hole, forcing the end of the expansion screw that extends into the bone to burst open along the expansion joint, thereby strengthening the connection between the expansion screw and the bone. After the end of the expansion screw that extends into the bone bursts open, it will form a structure similar to an inverted T. The inverted T-shaped structure can effectively prevent the expansion screw from coming out of the bone and prevent the expansion screw from failing.

[0006] Preferably, it further includes:

[0007] A conical sleeve is placed at the end of the expansion screw that extends into the bone.

[0008] Preferably, the tapered sleeve is provided with an ejector portion, which is disposed in the tapered sleeve and extends at least partially into the inner column hole.

[0009] Preferably, it further includes:

[0010] External thread section, the external thread section is located on the set screw;

[0011] Internal thread section, the internal thread section is set in the internal column hole.

[0012] Preferably, it further includes:

[0013] The first screw-in groove is located at the end of the expansion bone screw away from the steel plate.

[0014] Preferably, it further includes:

[0015] The second screw-in groove is located at the end of the set screw away from the steel plate. Attached Figure Description

[0016] Figure 1 A schematic diagram of a structure for fixing a steel plate using a self-expanding bone screw;

[0017] Figure 2 A cross-sectional view of a structure in which a steel plate is fixed by a self-expanding bone screw;

[0018] Figure 3 A three-dimensional structural diagram of a self-expanding bone screw;

[0019] Figure 4 A cross-sectional view of a steel plate fixed by another type of self-expanding bone screw;

[0020] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0021] Figure 6 for Figure 4 A magnified view of a section at point B.

[0022] In the diagram: 1. Steel plate; 2. Bone; 3. Top screw; 31. Second screw-in groove; 32. External thread section; 4. Expansion bone screw; 41. Internal thread section; 42. First screw-in groove; 43. Internal cylindrical hole; 44. Internal conical hole; 5. Expansion joint; 6. Conical sleeve; 61. Ejector section. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In this document, terms such as "upper," "lower," "inner," and "outer" are established based on the positional relationships shown in the accompanying drawings. Depending on the drawings, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection. Moreover, relational terms such as "first" and "second" are only used to distinguish one component from another that has the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0025] Example: Figure 1-3 As shown, a self-expanding bone screw includes: an expanding bone screw 4, which is screwed to a steel plate 1 and at least partially extends into the bone 2; at least two expansion joints 5, one of which is provided at the end of the expanding bone screw 4 that extends into the bone 2, and the two expansion joints 5 are spaced apart from each other on the expanding bone screw 4; an inner cylindrical hole 43, which is provided in the expanding bone screw 4; an inner conical hole 44, which is provided in the expanding bone screw 4 and communicates with the inner cylindrical hole 43; and a setter screw 3, which is movably provided in the inner cylindrical hole 43.

[0026] Specifically, by screwing the expansion screw 4, the expansion screw 4 is brought into contact with the steel plate 1 and the bone 2. At this time, the set screw 3 is inserted into the inner post hole 43 and pressed down so that the set screw 3 enters the inner conical hole 44. As the cross-sectional area of ​​the inner conical hole 44 gradually decreases, as the set screw 3 goes deeper, the set screw 3 squeezes the end of the expansion screw 4 that extends into the bone 2 through the inner wall surface of the inner conical hole 44, forcing the end of the expansion screw 4 that extends into the bone 2 to burst open along the expansion joint 5, thereby strengthening the connection between the expansion screw 4 and the bone 2. After the end of the expansion screw 4 that extends into the bone 2 bursts open, it will form a structure similar to an inverted T. The inverted T-shaped structure can effectively prevent the expansion screw 4 from coming out of the bone 2 and prevent the expansion screw 4 from failing.

[0027] like Figure 4-6 As shown, it further includes a conical sleeve 6, which is disposed at the end of the expansion screw 4 that extends into the bone 2. The conical sleeve 6 is provided to prevent the bone 2 from entering the inner conical hole 44 and prematurely breaking the expansion screw 4. The conical sleeve 6 also helps to reduce the difficulty of inserting the expansion screw 4. Preferably, the outer or inner surface of the conical sleeve 6 is provided with an axially extending fracture groove. The fracture groove allows the conical sleeve 6 to be damaged by the breaking of the expansion screw 4 when the set screw 3 is inserted, thus preventing the conical sleeve 6 from restricting the breaking of the expansion screw 4.

[0028] Furthermore, the conical sleeve 6 is provided with an ejector portion 61, which is disposed within the conical sleeve 6 and at least partially extends into the inner post hole 43. During the movement of the set screw 3 within the inner post hole 43, the ejector portion 61 can push the conical sleeve 6 deeper into the bone 2, preventing the conical sleeve 6 from interfering with the bursting of the expandable bone screw 4. Preferably, the ejector portion 61 and the fracture groove can be arranged simultaneously to improve safety and ensure that the expandable bone screw 4 can burst open.

[0029] like Figure 1-3 As shown, it further includes: an external thread section 32, which is disposed in the set screw 3; and an internal thread section 41, which is disposed in the inner post hole 43. When the set screw 3 extends into the inner post hole 43 until the external thread section 32 and the internal thread section 41 begin to contact, the set screw 3 is screwed to allow the set screw 3 to continue extending along the inner post hole 43. The engagement between the external thread section 32 and the internal thread section 41 provides self-locking, preventing the set screw 3 from dislodging from the inner post hole 43 under the pressure of the bone 2.

[0030] Furthermore, it also includes a first screw-in groove 42, which is located at the end of the expansion screw 4 away from the steel plate 1. The first screw-in groove 42 facilitates the screwing in of the expansion screw 4.

[0031] Furthermore, it also includes a second screw-in groove 31, which is located at the end of the set screw 3 away from the steel plate 1. The second screw-in groove 31 facilitates the screwing in of the set screw 3.

[0032] The technical features described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A self-expanding bone screw, characterized in that, include: Expandable bone screw (4), the expandable bone screw (4) is screwed to the steel plate (1), the expandable bone screw (4) extends at least partially into the bone (2). At least two expansion joints (5) are provided at one end of the expansion bone screw (4) that extends into the bone (2), and the two expansion joints (5) are spaced apart from the expansion bone screw (4). Inner post hole (43), the inner post hole (43) is provided in the expansion bone screw (4); An inner conical hole (44) is provided in the expansion bone screw (4), and the inner conical hole (44) communicates with the inner column hole (43). A set screw (3) is movably disposed in the inner post hole (43).

2. The self-expanding bone screw according to claim 1, characterized in that, Also includes: A conical sleeve (6) is provided at one end of the expansion bone screw (4) that extends into the bone (2).

3. The self-expanding bone screw according to claim 2, characterized in that, The conical sleeve (6) is provided with an ejector portion (61), which is located on the conical sleeve (6) and extends at least partially into the inner post hole (43).

4. The self-expanding bone screw according to claim 1, characterized in that, Also includes: External thread section (32), the external thread section (32) is provided on the set screw (3); Internal thread section (41) is provided in the internal column hole (43).

5. A self-expanding bone screw according to claim 1, characterized in that, Also includes: The first screw-in groove (42) is located at the end of the expansion bone screw (4) away from the steel plate (1).

6. A self-expanding bone screw according to claim 4, characterized in that, Also includes: The second screw-in groove (31) is located at the end of the set screw (3) away from the steel plate (1).

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