Spine fixing nail

Abstract

The spine fixing nail comprises a hollow screw rod, an opening is formed in the surface of the hollow screw rod in a penetrating mode, one end of the hollow screw rod is connected with a fixing assembly through a connecting assembly, the fixing assembly is used for fixedly installing a fixing rod, and the connecting assembly and the hollow screw rod can be separated. The fixing assembly comprises a threaded sleeve, a pressing plate and a fixing plug, the fixing plug is in threaded connection with the threaded sleeve and used for pushing the pressing plate, so that the pressing plate is close to the bottom of the inner wall of the threaded sleeve and extrudes the fixing rod, and a second V-shaped groove and a first V-shaped groove matched with the fixing rod are formed in the pressing plate and the bottom of the inner wall of the threaded sleeve correspondingly. The fixing screw has the advantages that the opening is formed, bone tissue enters the hollow screw through the opening, the hollow screw is filled with the bone tissue, and therefore the stability of connection between the hollow screw and the spine can be improved, and the problem that the spine low in bone mineral density is not firmly combined with the fixing screw can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical treatment, in particular to a spinal fixation nail. Background Art

[0002] Spinal fixation screws do not need to be removed after internal fixation surgery for spinal bone diseases. For example, in common proliferative and degenerative diseases such as lumbar disc herniation and lumbar spinal stenosis, as well as tumor diseases such as spinal tumors, because intervertebral bone fusion is performed at the same time as spinal internal fixation, the fixed vertebrae are fused together and are relatively stable, which does not easily generate stress on the internal fixation devices. Therefore, the internal fixation devices rarely shift, loosen, or break, so surgical removal can be considered.

[0003] Existing spinal screws are directly embedded in the patient's spine. For some osteoporosis patients, the spinal density is relatively low, and the firmness between the screw and the spine cannot be ensured. In addition, because the human spine itself has a certain curvature, the fixation rod and multiple spinal fixation nails are in an inclined state after installation. The end face of the screw plug has poor contact with the outer circumference of the fixation rod, resulting in unstable fixation of the fixation rod. After a long time, the fixation rod is prone to loosening, affecting the correction effect. Utility Model Content

[0004] The purpose of the present invention is to provide a spinal fixation nail in order to solve the above problems, as described below.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The utility model provides a spinal fixation nail, comprising a hollow screw, the surface of which is penetrated by an opening, one end of which is connected to a fixing assembly for fixing a fixing rod via a connecting assembly, and the connecting assembly is detachable from the hollow screw;

[0007] The fixing assembly includes a threaded sleeve, a pressure plate and a fixing plug. The fixing plug is threadedly connected to the threaded sleeve and is used to push the pressure plate so that the pressure plate is close to the bottom of the inner wall of the threaded sleeve to squeeze the fixing rod. The pressure plate and the bottom of the inner wall of the threaded sleeve are respectively provided with a second V-shaped groove and a first V-shaped groove that match the fixing rod.

[0008] When using the above-mentioned spinal fixation nail, a hole is first punched on the surface of the spine, then a hollow screw is inserted into the hole, and the hollow screw is rotated so that it completely enters the spine. After the hollow screw is placed in the patient's body, after a certain period of time, bone tissue will enter the hollow screw through the opening and fill the interior of the hollow screw, thereby improving the stability of the connection between the hollow screw and the spine. The fixing rod is fixed by the fixing assembly. The fixing rod is a component used to adjust the position of each spine. The provision of the first V-groove and the second V-groove can improve the stability of the fixing assembly in fixing the fixing rod. After the patient's spine correction is completed, the connecting assembly can be separated from the hollow screw.

[0009] Preferably, a guide block is provided at one end of the hollow screw away from the fixing assembly, and the bottom of the guide block is conical.

[0010] Preferably, the connecting assembly includes a polygonal prism and an annular ring, both of which are fixed at the bottom of the threaded sleeve, the annular ring is sleeved on the surface of the hollow screw, an opening is provided at the end of the hollow screw, the polygonal prism is gap-matched with the opening, a screw is threadedly connected to the annular ring, and the screw passes through the hollow screw.

[0011] Preferably, the pressure plate is slidably disposed in the threaded sleeve, and the fixing rod is in contact with the first V-shaped groove and the second V-shaped groove.

[0012] Preferably, the bottom of the fixing plug is in contact with the plane of the pressure plate, and a hexagonal groove is provided on the fixing plug.

[0013] Preferably, two symmetrical notches are provided on the side surface of the threaded sleeve, and the fixing rod passes through the two notches.

[0014] Preferably, the hollow screw and the guide block are both made of titanium alloy.

[0015] Preferably, a layer of bioactive material is provided on the surface of the hollow screw and the guide block.

[0016] The beneficial effects are:

[0017] 1. An opening is provided so that bone tissue can enter the hollow screw through the opening and fill the interior of the hollow screw, thereby improving the stability of the connection between the hollow screw and the spine, and effectively solving the problem of weak connection between the spine with low bone density and the fixation screw;

[0018] 2. The fixing rod is fixed by the fixing assembly. The fixing rod is a component used to adjust the position of each spine. The first V-shaped groove and the second V-shaped groove can apply external force to the fixing rod from four directions, thereby improving the stability of the fixing assembly on the fixing rod;

[0019] 3. The fixed components can be quickly separated by connecting the components, thereby reducing the impact of the implant on the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a front view structural diagram of the utility model;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the hollow screw of the utility model;

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the connection component of the utility model;

[0025] Figure 5 It is a schematic diagram of the exploded structure of the fixing component of the utility model.

[0026] The following are the descriptions of the reference numerals:

[0027] 1. Hollow screw; 2. Guide block; 3. Opening; 4. Connecting assembly; 5. Fixing assembly; 6. Fixing rod; 7. Slot; 8. Polygonal column; 9. Annular ring; 10. Screw; 11. Threaded sleeve; 12. First V-groove; 13. Pressing plate; 14. Second V-groove; 15. Fixing plug; 16. Hexagonal groove. DETAILED DESCRIPTION

[0028] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 5 As shown, the utility model provides a spinal fixation nail, comprising a hollow screw 1, with an opening 3 extending through the surface of the hollow screw 1. One end of the hollow screw 1 is connected to a fixing assembly 5 for fixing a fixing rod 6 via a connecting assembly 4, and the connecting assembly 4 is detachable from the hollow screw 1. After the patient's spine is corrected, the connecting assembly 4, the fixing assembly 5 and the fixing rod 6 can be removed from the patient's body to reduce the impact of the implant on the patient.

[0030] The fixing assembly 5 includes a threaded sleeve 11, a pressure plate 13 and a fixing plug 15. The fixing plug 15 is threadedly connected to the threaded sleeve 11 to push the pressure plate 13 so that the pressure plate 13 is close to the bottom of the inner wall of the threaded sleeve 11 and squeezes the fixing rod 6. The pressure plate 13 and the bottom of the inner wall of the threaded sleeve 11 are respectively provided with a second V-shaped groove 14 and a first V-shaped groove 12 that match the fixing rod 6.

[0031] As an optional embodiment, a guide block 2 is provided at one end of the hollow screw 1 away from the fixing assembly 5, and the bottom of the guide block 2 is conical. The guide block 2 is gap-matched with the hole opened on the spine. The hollow screw 1 can be guided by the guide block 2 so that the hollow screw 1 can be accurately placed in the spine.

[0032] Furthermore, the connecting component 4 includes a polygonal prism 8 and an annular ring 9, which are both fixed at the bottom of the threaded sleeve 11. The annular ring 9 is sleeved on the surface of the hollow screw 1. An opening 3 is provided at the end of the hollow screw 1. The polygonal prism 8 is clearance-matched with the opening 3. A screw 10 is threadedly connected to the annular ring 9, and the screw 10 passes through the hollow screw 1. The polygonal prism 8 is inserted into the opening 3, so that the threaded sleeve 11 cannot rotate. The threaded sleeve 11 is further fixed by the screw 10, so that the threaded sleeve 11 cannot be separated from the hollow screw 1.

[0033] The pressure plate 13 is slidably disposed in the threaded sleeve 11 , and the fixing rod 6 contacts the first V-groove 12 and the second V-groove 14 . The provision of the first V-groove 12 and the second V-groove 14 can improve the stability of the fixing assembly 5 in fixing the fixing rod 6 .

[0034] The bottom of the fixing plug 15 is in contact with the plane of the pressing plate 13 and a hexagonal groove 16 is provided on the fixing plug 15 to facilitate the rotation of the fixing plug 15. Two symmetrical notches are provided on the side of the threaded sleeve 11, and the fixing rod 6 passes through the two notches.

[0035] The hollow screw 1 and the guide block 2 are both made of titanium alloy. A layer of bioactive material is provided on the surface of the hollow screw 1 and the guide block 2. The provision of the bioactive material can enable the hollow screw 1 and the guide block 2 to quickly combine with bone tissue.

[0036] Using the above structure, first punch a hole on the surface of the spine, then insert the hollow screw 1 into the hole, and rotate the hollow screw 1 so that it completely enters the spine. After the hollow screw 1 is placed in the patient's body, after a certain period of time, bone tissue will enter the hollow screw 1 through the opening 3 and fill the inside of the hollow screw 1, thereby improving the stability of the connection between the hollow screw 1 and the spine. The fixing rod 6 is fixed by the fixing component 5. The fixing rod 6 is a component for adjusting the position of each spine. The provision of the first V-groove 12 and the second V-groove 14 can improve the stability of the fixing component 5 in fixing the fixing rod 6. After the patient's spine correction is completed, the connecting component 4 can be separated from the hollow screw 1.

[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A spinal fixation nail, characterized by: The hollow screw (1) comprises an opening (3) extending through the surface of the hollow screw (1); one end of the hollow screw (1) is connected to a fixing assembly (5) for fixing a fixing rod (6) via a connecting assembly (4); and the connecting assembly (4) and the hollow screw (1) are detachable. The fixing assembly (5) comprises a threaded sleeve (11), a pressure plate (13) and a fixing plug (15); the fixing plug (15) is threadedly connected to the threaded sleeve (11) and is used to push the pressure plate (13) so that the pressure plate (13) approaches the bottom of the inner wall of the threaded sleeve (11) and squeezes the fixing rod (6); and the pressure plate (13) and the bottom of the inner wall of the threaded sleeve (11) are respectively provided with a second V-shaped groove (14) and a first V-shaped groove (12) that match the fixing rod (6).

2. The spinal fixation nail according to claim 1, characterized in that: A guide block (2) is provided at one end of the hollow screw (1) away from the fixing assembly (5), and the bottom of the guide block (2) is conical.

3. The spinal fixation nail according to claim 1, characterized in that: The connecting assembly (4) comprises a polygonal column (8) and an annular ring (9), wherein the polygonal column (8) and the annular ring (9) are both fixed to the bottom of a threaded sleeve (11), the annular ring (9) is sleeved on the surface of a hollow screw (1), an opening (3) is provided at the end of the hollow screw (1), the polygonal column (8) and the opening (3) are clearance-matched, a screw (10) is threadedly connected to the annular ring (9), and the screw (10) passes through the hollow screw (1).

4. The spinal fixation nail according to claim 1, characterized in that: The pressing plate (13) is slidably arranged in the threaded sleeve (11), and the fixing rod (6) is in contact with the first V-shaped groove (12) and the second V-shaped groove (14).

5. The spinal fixation nail according to claim 1, characterized in that: The bottom of the fixing plug (15) is in contact with the plane of the pressing plate (13), and a hexagonal groove (16) is provided on the fixing plug (15).

6. The spinal fixation nail according to claim 1, characterized in that: Two symmetrical notches are provided on the side of the threaded sleeve (11), and the fixing rod (6) passes through the two notches.

7. The spinal fixation nail according to claim 2, characterized in that: The hollow screw (1) and the guide block (2) are both made of titanium alloy.

8. The spinal fixation nail according to claim 7, characterized in that: A layer of bioactive material is provided on the surface of the hollow screw (1) and the guide block (2).

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