Intervertebral disc mobile prosthesis

Abstract

The present invention discloses a movable intervertebral disc prosthesis, comprising an upper intervertebral disc prosthesis and a lower intervertebral disc prosthesis; a movable ball structure is provided on the upper intervertebral disc prosthesis, and a movable cavity for the movable ball structure is provided on the lower intervertebral disc prosthesis. The movable ball structure cooperates with the movable cavity to convert the friction between the upper intervertebral disc prosthesis and the lower intervertebral disc prosthesis into rolling friction, thereby reducing frictional resistance and further increasing the service life of the movable intervertebral disc prosthesis.

Description

Technical Field

[0001] The invention belongs to the technical field of implant devices, and in particular relates to a movable intervertebral disc prosthesis. Background Art

[0002] Traditional disc fusion surgery sacrifices a lot of spinal mobility in the process of treating intervertebral disc disease. The contact surface of the intervertebral disc prosthesis in the host body is easily damaged by the large sliding friction during the patient's movement, thus affecting the service life of the prosthesis. At the same time, long-term sliding friction will cause the material on the surface of the prosthesis to fall off and produce debris. The debris can easily cause inflammation in the human body and cause the implanted prosthesis to loosen. At present, wear-resistant materials are used between the contact surfaces of the intervertebral disc to increase the service life of the prosthesis, which is costly and complex to process. The stability of traditional intervertebral disc matching is not high, and it is easy to dislocate due to looseness, and it is easy to cause collision damage and abnormal noise. At the same time, the flexibility between the intervertebral discs is not high. The traditional intervertebral disc adopts a regular structure design, which does not match the patient's natural spine. Summary of the invention

[0003] The invention provides an intervertebral disc movable prosthesis, which has the advantages of small friction resistance and long practical life.

[0004] To solve the above problems, the present invention adopts the following technical measures.

[0005] A mobile intervertebral disc prosthesis, comprising an upper intervertebral disc prosthesis and a lower intervertebral disc prosthesis;

[0006] The upper intervertebral disc prosthesis includes a first main body plate and a movable ball structure, wherein the upper surface of the first main body plate is provided with a conical fixing nail, and the movable ball structure is arranged on the lower surface of the first main body plate, and the position of the movable ball structure corresponds to the axis of the rotation axis when the spine is twisted; the movable ball structure includes a movable hemisphere and a ball, wherein the movable hemisphere is fixed on the lower surface of the first main body plate, and the movable hemisphere is provided with a movable groove, wherein the ball is arranged in the movable groove, and wherein the ball rotates in the movable groove;

[0007] The lower intervertebral disc prosthesis includes a second main body plate and an active cavity. The upper surface of the second main body plate is provided with an active cavity, and the position of the active cavity corresponds to the position of the active ball structure, and the active cavity is adapted to the active ball structure; the lower surface of the second main body plate is provided with a conical fixing nail.

[0008] Furthermore, the upper surface of the first main body plate is a rough arc-shaped surface; the lower surface of the first main body plate is a smooth plane, and the upper surface of the first main body plate can fit the arc surface in contact with the patient's spine.

[0009] Furthermore, the thickness of the first main body plate is 1.5-3.0 mm.

[0010] Furthermore, the upper surface of the second main body plate is a smooth plane; the lower surface of the second main body plate is a rough arc-shaped surface, and the lower surface of the second body can fit the arc surface in contact with the patient's spine.

[0011] Furthermore, the thickness of the second main body plate is 1.5-3.0 mm.

[0012] Furthermore, the surface of the movable ball structure is covered with a polymer ceramic film.

[0013] Furthermore, the conical fixing nails are arranged at the middle position of the upper surface of the first main body plate, and the conical fixing nails are evenly distributed.

[0014] Furthermore, the conical fixing nails are arranged at the middle position of the lower surface of the second main body plate, and the conical fixing nails are evenly distributed.

[0015] The manufacturing method of the intercone disc mobile prosthesis:

[0016] (1) Obtain the required data by CT scanning the spinal morphology of the patient's affected area, then import the data into MIMICS software to generate a three-dimensional image in STL format, and then perform repair;

[0017] (2) Importing the repaired model into Magics software, and obtaining the structures of the first main plate and the second main plate of the intervertebral disc prosthesis by selecting the spinal arc stretching method;

[0018] (3) Draw the ball bearing active structure, active cavity structure, and conical fixing pin in PRO / E software, and finally output the model in STL format;

[0019] (4) Importing the above model into Magics software, obtaining the structure of the present invention through Boolean operation, and then repairing it;

[0020] (5) Setting a support on the model of the intercone disc prosthesis, and making sure that the support surface is a rough surface;

[0021] (6) Importing the model into the SLM3D printer for manufacturing;

[0022] (7) The processed sample is polished and polymer ceramics are sprayed on the ball bearing to finally complete the preparation of the intervertebral disc mobile prosthesis.

[0023] The beneficial effects of the present invention are as follows: the intervertebral disc prosthesis described in the present invention comprises an upper intervertebral disc prosthesis and a lower intervertebral disc prosthesis, and a movable ball structure is provided on the upper intervertebral disc prosthesis, and an movable cavity corresponding to the movable ball structure is provided on the lower intervertebral disc prosthesis. The cooperation between the movable ball structure and the movable cavity transforms the friction between the upper intervertebral disc prosthesis and the lower intervertebral disc prosthesis into rolling friction, thereby reducing frictional resistance and further increasing the service life of the intervertebral disc prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the upper intervertebral disc prosthesis described in Example 1;

[0025] Figure 2 is a schematic structural diagram of the lower intervertebral disc prosthesis described in Example 1;

[0026] Figure 3 It is a schematic diagram of the assembly structure of the upper intervertebral disc prosthesis and the lower intervertebral disc prosthesis in Example 1. DETAILED DESCRIPTION

[0027] Example 1

[0028] Reference Figure 1 to Figure 3 , a mobile intervertebral disc prosthesis, comprising an upper intervertebral disc prosthesis 100 and a lower intervertebral disc prosthesis 200;

[0029] The upper intervertebral disc prosthesis 100 includes a first main body plate 110 and a movable ball structure. The upper surface of the first main body plate 110 is provided with a conical fixing nail 130. The movable ball structure is arranged on the lower surface of the first main body plate 110, and the position of the movable ball structure corresponds to the axis of the rotation axis when the spine is twisted; the movable ball structure includes a movable hemisphere 121 and a ball 122. The movable hemisphere 121 is fixed on the lower surface of the first main body plate 110, and the movable hemisphere 121 is provided with a movable groove 123. The ball 122 is arranged in the movable groove 123, and the ball 122 rotates in the movable groove 123.

[0030] The lower intervertebral disc prosthesis 200 includes a second main body plate 210 and an active cavity 220. The upper surface of the second main body plate 210 is provided with an active cavity 220, and the position of the active cavity 220 corresponds to the position of the active ball structure, and the active cavity 220 is adapted to the active ball structure; the lower surface of the second main body plate 210 is provided with a conical fixing nail 130.

[0031] Furthermore, the upper surface of the first main body plate 110 is a rough arc-shaped surface; the lower surface of the first main body plate 110 is a smooth plane; and the upper surface of the first main body plate 110 can fit the arc surface in contact with the patient's spine.

[0032] Furthermore, the thickness of the first main body plate 110 is 1.5-3.0 mm.

[0033] Furthermore, the upper surface of the second main body plate 210 is a smooth plane; the lower surface of the second main body plate 210 is a rough arc-shaped surface; and the lower surface of the second main body 210 can fit the arc surface in contact with the patient's spine.

[0034] Furthermore, the thickness of the second main body plate 210 is 1.5-3.0 mm.

[0035] Furthermore, the surface of the movable ball structure is covered with a polymer ceramic film.

[0036] Furthermore, the conical fixing nails 130 are disposed at a middle position of the upper surface of the first main body plate 110 , and the conical fixing nails 130 are evenly distributed.

[0037] Furthermore, the conical fixing nails 130 are disposed at a middle position of the lower surface of the second main body plate 210 , and the conical fixing nails 130 are evenly distributed.

[0038] The manufacturing method of the intercone disc mobile prosthesis:

[0039] (1) Obtain the required data by CT scanning the spinal morphology of the patient's affected area, then import the data into MIMICS software to generate a three-dimensional image in STL format, and then perform repair;

[0040] (2) Importing the repaired model into Magics software, and obtaining the structures of the first main plate 110 and the second main plate 210 of the intervertebral disc prosthesis by selecting the method of spinal arc stretching;

[0041] (3) Draw the movable ball structure, the movable cavity 220 structure, and the conical fixing pin 130 in PRO / E software, and finally output the model in STL format;

[0042] (4) Importing the above model into Magics software, obtaining the structure of the present invention through Boolean operation, and then repairing it;

[0043] (5) Setting a support on the model of the intercone disc prosthesis, and making sure that the support surface is a rough surface;

[0044] (6) Importing the model into the SLM3D printer for manufacturing;

[0045] (7) The processed sample is polished and polymer ceramics are sprayed on the ball bearing to finally complete the preparation of the intervertebral disc movable prosthesis.

Claims

1. A mobile intervertebral disc prosthesis, characterized in that: It includes upper disc prosthesis and lower disc prosthesis; The upper intervertebral disc prosthesis includes a first main body plate and a movable ball structure, the upper surface of the first main body plate is provided with a conical fixing nail, the upper surface of the first main body plate is a rough arc surface, the movable ball structure is arranged on the lower surface of the first main body plate, the lower surface of the first main body plate is a smooth plane, and the position of the movable ball structure corresponds to the axis of the rotation axis when the spine is twisted, and the thickness of the first main body plate is 1.5~3.0mm; the movable ball structure includes a movable hemisphere and a ball, the movable hemisphere is fixed at the lower surface of the first main body plate, and the movable hemisphere is provided with a movable groove, the ball is arranged in the movable groove, and the ball rotates in the movable groove; The lower intervertebral disc prosthesis includes a second main body plate and an active cavity. The upper surface of the second main body plate is provided with an active cavity, and the position of the active cavity corresponds to the position of the active ball structure, and the active cavity is adapted to the active ball structure; the lower surface of the second main body plate is provided with a conical fixing nail.

2. The intervertebral disc prosthesis according to claim 1, characterized in that: The upper surface of the second main body plate is a smooth plane; the lower surface of the second main body plate is a rough arc-shaped surface.

3. The intervertebral disc mobile prosthesis according to claim 1, characterized in that: The thickness of the second main body plate is 1.5-3.0 mm.

4. The intervertebral disc mobile prosthesis according to claim 1, characterized in that: The surface of the movable ball structure is covered with a polymer ceramic film.

5. The intervertebral disc mobile prosthesis according to claim 1, characterized in that: The conical fixing nails are arranged at the middle position of the upper surface of the first main body plate, and the conical fixing nails are evenly distributed.

6. The intervertebral disc mobile prosthesis according to claim 1, characterized in that: The conical fixing nails are arranged at the middle position of the lower surface of the second main body plate, and the conical fixing nails are evenly distributed.

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