One-piece anatomical cervical titanium mesh system

Abstract

The present invention discloses an integrated anatomical cervical titanium mesh system, comprising a cylindrical titanium mesh, a head end gasket and a tail end gasket; the bottom of the head end gasket is connected to the top of the cylindrical titanium mesh as a whole; the bottom of the cylindrical titanium mesh is connected to the tail end gasket as a whole through a hook, a groove and a threaded screw; the titanium mesh and the gasket are implanted together after being installed, eliminating the step of installing a steel plate and simplifying the surgical operation; the top of the head end gasket is an arched ring surface with a certain curvature, and the arched ring surface is consistent with the concave curvature of the lower end plate of the cervical vertebral body, which can better fit with the cervical vertebral body and increase the contact area, which can not only enhance the contact between the bone graft particles and the bone surface of the cervical vertebral body, but also facilitate fusion, and at the same time, better fit and larger contact area are conducive to dispersing stress, reducing the pressure on the contact surface with the cervical vertebral body end plate, and preventing the titanium mesh from damaging the lower end plate of the adjacent vertebra at the head end.

Description

Technical Field

[0001] The invention relates to a medical auxiliary device, in particular to an integrated anatomical cervical titanium mesh system. Background Art

[0002] The application of anterior cervical corpectomy decompression bone grafting and internal fixation is becoming more and more widespread. It can not only achieve effective decompression of the anterior route, but also restore the cervical curvature, while avoiding the damage to the neck muscles caused by posterior surgery. Anterior cervical titanium alloy plates, titanium meshes, and screw systems are widely used in anterior cervical corpectomy, but there are also cases of postoperative titanium mesh tipping and sinking during the application process, which brings the possibility of secondary surgical revision. At the same time, the current titanium mesh structure design is mostly an ordinary cylindrical structure. Even if the gasket is installed after cutting, both ends are flat, which does not achieve a good fit with the anatomical structure of the cervical spine, which is easy to cause the problem of long bone graft fusion time or even no fusion. In addition, it is necessary to combine the anterior cervical steel plate to restore the cervical curvature. The anterior cervical steel plate is located directly below the esophagus, which is easy to irritate the esophagus. Some patients have pharyngeal discomfort or foreign body sensation after surgery. The current titanium mesh must also be operated with special care during the implantation of the bone groove to prevent the titanium mesh from being implanted too deep to squeeze the dura mater and even damage the cervical spinal cord. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides an integrated anatomical cervical titanium mesh system to solve the problems of the current anterior cervical titanium mesh being easy to tip over and sink, slow bone graft fusion, complicated intraoperative operation, and the existing steel plate plus titanium mesh irritating the patient's esophagus.

[0004] The technical solution of the present invention is: an integrated anatomical cervical titanium mesh system, comprising a cylindrical titanium mesh, a head end gasket and a tail end gasket; the bottom of the head end gasket is connected to the top of the cylindrical titanium mesh as a whole;

[0005] The head end gasket includes a first annular gasket, the bottom of the first annular gasket is connected to the top of the cylindrical titanium mesh as a whole, and the top of the first annular gasket is designed as an arched annular surface that matches the concave curvature of the lower end plate of the cervical vertebral body; one side of the first annular gasket is inclined from bottom to top in a direction away from the central axis so that a first inclined surface is formed on one side of the first annular gasket, a first connecting plane is processed on the top of the first inclined surface in the vertical direction, and a vertical first extension plate is integrally connected to the outside of the first connecting plane; first threaded holes are provided on the first extension plate and the first inclined surface;

[0006] The bottom of the titanium mesh is a wide-walled ring, and the bottom opening of the wide-walled ring is processed with a plurality of inverted L-shaped slots and a second threaded hole;

[0007] The tail end gasket includes a second annular gasket, one side of the second annular gasket is inclined from top to bottom in a direction away from the central axis so that a second inclined surface is formed on one side of the second annular gasket, a second connecting plane is processed at the bottom of the second inclined surface in a vertical direction, and a vertical second extension plate is integrally connected to the outer side of the second connecting plane; a third threaded hole is provided on both the second extension plate and the second inclined surface;

[0008] The top surface of the second annular gasket is provided with a plurality of hooks corresponding to the grooves on the bottom surface of the wide wall ring and a fourth threaded hole running through the top of the second inclined surface. When the hooks are inserted into the grooves and rotated to clamp, the fourth threaded hole corresponds to the second threaded hole and is fixedly connected by tightening the screws. The first extension plate and the second extension plate are located on the same vertical line.

[0009] Furthermore, the bottom surface of the second annular gasket is an inclined surface, and the inclination direction is based on the horizontal plane and starts to incline upward from a position close to the second extension plate.

[0010] Furthermore, the angle of inclination between the inclined plane and the horizontal plane is 5 to 25 degrees. This design allows the titanium mesh gasket to play a role in expanding the upper and lower vertebral bodies after being implanted into the bone groove, thereby restoring the physiological curvature of the cervical spine without the help of anterior cervical steel plates.

[0011] Furthermore, the wide wall ring is processed with a plurality of easy-to-cut lines along the circumferential direction from top to bottom, and an easy-to-cut line segment with a height of 2-4 mm is formed between the two easy-to-cut lines, and each easy-to-cut line segment is designed with a slot (41) and a second threaded hole that are the same as those on the bottom surface of the wide wall ring. In practical applications, the length can be fine-tuned according to actual conditions.

[0012] Furthermore, the first extension plate is provided with a first threaded hole, the first inclined surface is provided with two first threaded holes, and the three first threaded holes are located at three corners of the regular triangle. The three screws form a triangular stable structure, which can effectively prevent the titanium mesh from shifting or settling after surgery.

[0013] Furthermore, a third threaded hole is provided on the second extension plate, two third threaded holes are provided on the second inclined surface, and the three third threaded holes are located at three corners of the regular triangle. The three screws form a triangular stable structure, which can effectively prevent the titanium mesh from shifting or settling after surgery.

[0014] Furthermore, the maximum angle of the first inclined surface and the second inclined surface from the central axis is 20-25°. The threaded hole is opened on the inclined surface so as to be able to insert the nail obliquely, which is convenient for surgical operation.

[0015] Furthermore, the titanium mesh has a height of 25 mm to 75 mm, a diameter of 10 mm to 17 mm, and a thickness of 1 mm to 2 mm.

[0016] Furthermore, the inner surfaces of the first annular gasket and the second annular gasket are flush with the inner surface of the titanium mesh, and the outer surfaces of the first annular gasket and the second annular gasket protrude 1-2 mm from the outer surface of the titanium mesh to ensure the strength of the gasket. The gasket materials are both titanium alloy.

[0017] Furthermore, the thickness of the wide wall ring is 3-4 mm, the outer surface of the wide wall ring is flush with the outer surface of the titanium mesh, and the inner surface of the wide wall ring protrudes from the inner surface of the titanium mesh by 1-2 mm.

[0018] The beneficial effects of the present invention are:

[0019] 1. The top of the head end gasket of the new anatomical titanium mesh is an arched ring surface with a certain curvature. The arched ring surface is consistent with the concave curvature of the lower end plate of the cervical vertebral body, which can better fit with the cervical vertebral body and increase the contact area. It can not only improve the contact between the bone graft particles and the bone surface of the cervical vertebral body, which is conducive to fusion, but also better fit and larger contact area are conducive to dispersing stress, reducing the pressure on the contact surface with the cervical vertebral end plate, and preventing the titanium mesh from damaging the lower end plate of the adjacent vertebra at the head end.

[0020] 2. A first vertical extension plate is extended to the front end on one side of the head end gasket. Three threaded holes are reserved on the inclined surfaces of the extension plate and the head end gasket, which can clamp the vertebral body of the adjacent vertebra at the head end during the implantation of the titanium mesh into the bone groove to prevent the titanium mesh from being implanted too deeply and causing compression or damage to the dura mater. After the implantation is completed, it can be fixed to the vertebral body by screws, so that the titanium mesh gasket and the cervical vertebral body form an integrated force-bearing structure. The three screws form a triangular stable structure, which can effectively prevent the displacement or settlement of the titanium mesh after surgery.

[0021] 3. The tail end of the titanium mesh is designed as a wide-wall structure with a slot and a threaded hole in the wall, which corresponds to the hook on the tail end gasket. After the hook is inserted into the slot, it can be rotated clockwise to prevent the tail end gasket from longitudinally detaching. At this time, the threaded hole on the wide-wall structure corresponds to the threaded hole on the tail end gasket. Screwing in a special small screw can prevent the tail end gasket from rotating, thereby firmly combining the titanium mesh and the tail end gasket.

[0022] 4. Multiple easy-to-cut lines with a spacing of 2-4mm are designed at the tail end of the titanium mesh. The length can be fine-tuned according to actual conditions. Each easy-to-cut line segment has an independent slot structure.

[0023] 5. The bottom of the tail end gasket is designed to be an inclined surface. This design allows the titanium mesh gasket to play a role in expanding the upper and lower vertebrae after being implanted into the bone groove, thereby restoring the physiological curvature of the cervical spine without the help of an anterior cervical plate.

[0024] 6. The independent gasket at the tail end has an extension plate structure similar to that of the integrated gasket at the head end. The extension plate extends vertically toward the tail end, and can hold the anterior wall of the adjacent vertebra at the tail end during the titanium mesh implantation process. Three screw holes are reserved on the inclined surfaces of the extension plate and the tail end gasket. Screws can also be implanted through the screw holes reserved on the extension plate and the tail end gasket, thereby fixing the titanium mesh gasket system to the lower adjacent vertebra, which can enhance the anti-sinking effect of the titanium mesh.

[0025] 7. The titanium mesh and gasket are installed and implanted together, eliminating the step of installing the steel plate and simplifying the surgical operation.

[0026] 8. Compared with other one-piece titanium meshes, this design can flexibly cut the length of the titanium mesh according to the intraoperative measurement data. The titanium mesh and installation method are the same as the traditional ones, which is convenient for clinical application.

[0027] 9. The area of ​​the two extension plates is significantly smaller than that of traditional anterior cervical plates. They are low-profile fixators that can reduce stimulation to the esophagus and other surrounding soft tissues and reduce postoperative throat discomfort in patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the integrated structure of the titanium mesh and the head end gasket;

[0029] Figure 2 It is a side view of the integrated structure of titanium mesh and head end gasket;

[0030] Figure 3 is a schematic diagram of the structure of the tail end gasket;

[0031] Figure 4 It is a side view of the tail end gasket;

[0032] Figure 5 It is a schematic diagram of the bottom surface of the wide wall ring;

[0033] Figure 6 This is a schematic diagram of the coordinated movement of the hook and the slot.

[0034] In the figure: 1 is a titanium mesh, 2 is a head end gasket, 21 is a first annular gasket, 22 is an arched annular surface, 23 is a first connecting plane, 24 is a first extension plate, 25 is a first threaded hole,

[0035] 3 is the tail end gasket, 31 is the second annular gasket, 32 is the second connecting plane, 33 is the second extension plate, 34 is the third threaded hole, 35 is the hook,

[0036] 4 is a wide wall ring, 41 is a clamping groove, 42 is a second threaded hole, and 43 is an easy-to-cut wire. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] like Figure 1-4 As shown, the integrated anatomical cervical titanium mesh system includes a cylindrical titanium mesh 1, a head end gasket 2 and a tail end gasket 3. The bottom of the head end gasket 2 is connected to the top of the cylindrical titanium mesh 1 as a whole.

[0039] like Figure 1 , 2 As shown, the head end gasket 2 includes a first annular gasket 21, the bottom of the first annular gasket 21 is connected to the top of the cylindrical titanium mesh 1 as a whole, and the top of the first annular gasket 21 is designed as an arched annular surface 22 that matches the concave curvature of the lower end plate of the cervical vertebral body. One side of the first annular gasket 21 is inclined from bottom to top in a direction away from the central axis so that a first inclined surface is formed on one side of the first annular gasket, and the maximum angle of the first inclined surface from the central axis is 20°. A first connecting plane 23 is processed at the top of the first inclined surface in the vertical direction, and a vertical first extension plate 24 is integrally connected to the outside of the first connecting plane 23. A first threaded hole 25 is provided on the first extension plate 24 and the first inclined surface. Preferably, a first threaded hole 25 is provided on the first extension plate 24, and two first threaded holes 25 are provided on the first inclined surface, and the three first threaded holes 25 are located at the three corners of the regular triangle. The three screws form a triangular stable structure, which can effectively prevent the titanium mesh from shifting or settling after surgery.

[0040] The bottom of the titanium mesh 1 is a wide wall ring 4, and the bottom opening of the wide wall ring 4 is processed with four inverted L-shaped slots 41 and a second threaded hole 42. The wide wall ring 4 is processed with a plurality of easy-to-cut lines 43 along the circumference from top to bottom, and a 3mm high easy-to-cut line segment is formed between two easy-to-cut lines 43. Each easy-to-cut line segment is designed with the same slot 41 and second threaded hole 42 as the bottom of the wide wall ring. In practical applications, the length can be fine-tuned according to actual conditions.

[0041] like Figure 3 , 4 As shown, the tail end gasket 3 includes a second annular gasket 31, and one side of the second annular gasket 31 is inclined from top to bottom in a direction away from the central axis so that a second inclined surface is formed on one side of the second annular gasket, and the maximum angle of the second inclined surface deviating from the central axis is 20°. A second connecting plane 32 is processed in the vertical direction at the bottom of the second inclined surface, and a vertical second extension plate 33 is integrally connected to the outside of the second connecting plane 32. A third threaded hole 34 is provided on the second extension plate 33 and the second inclined surface. Preferably, a third threaded hole 34 is provided on the second extension plate 33, and two third threaded holes 34 are provided on the second inclined surface, and the three third threaded holes 34 are located at the three corners of the equilateral triangle. The three screws form a triangular stable structure, which can effectively prevent the titanium mesh from shifting or settling after surgery.

[0042] The top surface of the second annular gasket 31 is provided with four hooks 35 corresponding to the slots 41 on the bottom surface of the wide wall ring 4 and a fourth threaded hole penetrating the top of the second inclined surface. When the hooks 35 are inserted into the slots 41 and rotated to clamp, the fourth threaded hole corresponds to the second threaded hole 42 and is fixedly connected by tightening the screws. The first extension plate 24 and the second extension plate 33 are located on the same vertical line. Figure 4 As shown, the bottom surface of the second annular gasket 31 is an inclined surface, and the inclination direction is based on the horizontal plane and starts to incline upward from the second extension plate. The inclination angle between the inclined surface and the horizontal plane is 5 to 25 degrees. This design can make the titanium mesh gasket implanted together with the bone groove play a role in expanding the upper and lower vertebral bodies, thereby achieving the effect of restoring the physiological curvature of the cervical spine without the help of anterior cervical steel plates.

[0043] In this design, the diameter specifications of the titanium mesh are 10mm, 12mm, 14mm, 16mm, and 17mm, and the integrated gasket at the head end and the gasket at the tail end also have different corresponding sizes corresponding to the diameter of the titanium mesh. The length specifications of the titanium mesh are 25mm, 35mm, 45mm, 55mm, 65mm, and 75mm, and the length can be cut according to the required length actually measured during the operation. The thickness specifications of the titanium mesh are 1mm and 2mm. Among them, the inner surface of the first annular gasket 21 and the second annular gasket 31 are flush with the inner surface of the titanium mesh 1, and the outer surface of the first annular gasket 21 and the second annular gasket 31 protrudes from the outer surface of the titanium mesh 1 by 1-2mm. Ensure the strength of the gasket. And the gasket material is titanium alloy. The outer surface of the wide wall ring is flush with the outer surface of the titanium mesh 1, and the inner surface of the wide wall ring 4 protrudes from the inner surface of the titanium mesh 1 by 1-2mm.

[0044] The upper and lower intervertebral discs of the target vertebra are processed in the same way as traditional cervical spondylectomy, and then the bone groove is bitten out of the target vertebra in the same way. At this time, the required length of the titanium mesh is measured with a measuring tool, and a titanium mesh of appropriate length and diameter is selected. The titanium mesh is cut from the lower end to make its length more accurate, and a tail end gasket with an appropriate angle is selected to firmly connect the tail end gasket to the titanium mesh. At this time, the titanium mesh gasket integrated structure is filled with autologous cancellous bone or allogeneic bone particles, and this structure is driven into the bone groove. When the titanium mesh is completely placed in the bone groove, the upper and lower extension plates respectively clamp the upper and lower adjacent vertebrae, and the screws fix the vertebral body. At this time, the titanium mesh system is implanted.

[0045] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. One-piece anatomical cervical titanium mesh system, characterized by: It comprises a cylindrical titanium mesh (1), a head end gasket (2) and a tail end gasket (3); the bottom of the head end gasket (2) is integrally connected to the top of the cylindrical titanium mesh (1); The head end gasket (2) comprises a first annular gasket (21), the bottom of the first annular gasket (21) is integrally connected to the top of the cylindrical titanium mesh (1), and the top of the first annular gasket (21) is designed as an arched annular surface (22) that matches the concave curvature of the lower end plate of the cervical vertebral body; one side of the first annular gasket (21) is inclined from bottom to top in a direction away from the central axis so that a first inclined surface is formed on one side of the first annular gasket, a first connecting plane (23) is processed at the top of the first inclined surface in the vertical direction, and a vertical first extension plate (24) is integrally connected to the outer side of the first connecting plane (23); the first extension plate (24) and the first inclined surface are both provided with a first threaded hole (25); The bottom of the titanium mesh (1) is a wide-walled ring (4), and the bottom opening of the wide-walled ring (4) is processed with a plurality of inverted L-shaped slots (41) and a second threaded hole (42); The tail end gasket (3) comprises a second annular gasket (31), one side of the second annular gasket (31) is inclined from top to bottom in a direction away from the central axis so that a second inclined surface is formed on one side of the second annular gasket, a second connecting plane (32) is processed at the bottom of the second inclined surface in a vertical direction, and a vertical second extension plate (33) is integrally connected to the outer side of the second connecting plane (32); the second extension plate (33) and the second inclined surface are both provided with a third threaded hole (34); The top surface of the second annular gasket (31) is provided with a plurality of hooks (35) corresponding to the slots (41) on the bottom surface of the wide wall ring (4) and a fourth threaded hole penetrating the top of the second inclined surface. When the hooks (35) are correspondingly inserted into the slots (41) and rotated to clamp, the fourth threaded hole corresponds to the second threaded hole (42) and is fixedly connected by tightening the screws. The first extension plate (24) and the second extension plate (33) are located on the same vertical line. The bottom surface of the second annular gasket (31) is an inclined surface, and the inclination direction is based on the horizontal plane and starts to incline upward from the position close to the second extension plate; The wide wall ring (4) is provided with a plurality of easy-to-cut lines (43) from top to bottom along the circumferential direction, and an easy-to-cut line segment with a height of 2-4 mm is formed between each of the easy-to-cut lines (43). Each easy-to-cut line segment is provided with a groove (41) and a second threaded hole (42) identical to those on the bottom surface of the wide wall ring.

2. The integrated anatomical cervical titanium mesh system according to claim 1, characterized in that: The inclination angle between the inclined plane and the horizontal plane is 5-25°.

3. The integrated anatomical cervical titanium mesh system according to claim 1 is characterized in that: A first threaded hole (25) is provided on the first extension plate (24), two first threaded holes (25) are provided on the first inclined surface, and the three first threaded holes (25) are located at three corners of an equilateral triangle.

4. The integrated anatomical cervical titanium mesh system according to claim 1, characterized in that: A third threaded hole (34) is provided on the second extension plate (33), two third threaded holes (34) are provided on the second inclined surface, and the three third threaded holes (34) are located at three corners of an equilateral triangle.

5. The integrated anatomical cervical titanium mesh system according to claim 1, characterized in that: The maximum angle of the first inclined surface and the second inclined surface deviating from the central axis is 20-25°.

6. The integrated anatomical cervical titanium mesh system according to claim 1, characterized in that: The titanium mesh (1) has a height of 25 mm to 75 mm, a diameter of 10 mm to 17 mm, and a thickness of 1 mm to 2 mm.

7. The integrated anatomical cervical titanium mesh system according to claim 1, characterized in that: The inner surfaces of the first annular gasket (21) and the second annular gasket (31) are flush with the inner surface of the titanium mesh (1), and the outer surfaces of the first annular gasket (21) and the second annular gasket (31) protrude from the outer surface of the titanium mesh (1) by 1-2 mm.

8. The integrated anatomical cervical titanium mesh system according to claim 1, characterized in that: The thickness of the wide wall ring (4) is 3-4 mm, the outer surface of the wide wall ring (4) is flush with the outer surface of the titanium mesh (1), and the inner surface of the wide wall ring (4) protrudes from the inner surface of the titanium mesh (1) by 1-2 mm.

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