An artificial intervertebral disc

Abstract

The present invention discloses an artificial intervertebral disc, which comprises an upper end plate, an inner core and a lower end plate, wherein the lower end of the inner core is snap-connected to the lower end plate, the upper end of the inner core is spherical, the lower side surface of the upper end plate is provided with a spherical groove matching the upper end of the inner core, the upper end of the inner core is located in the spherical groove, the outer side wall of the inner core is provided with a circumferentially arranged support plate, the support plate is located between the upper end plate and the lower end plate, and the support plate abuts against the upper side surface of the lower end plate. The purpose is to provide an artificial intervertebral disc, which has a relatively simple structure and can well realize the function of the original intervertebral disc.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to an artificial intervertebral disc. Background Art

[0002] Artificial cervical disc replacement refers to the placement of a movable device (i.e., artificial disc) between the vertebrae after anterior discectomy to replace the original disc and perform its function, thereby achieving the purpose of retaining the motion segment and reducing the secondary degeneration of adjacent segments. The existing artificial disc is a special device that can simulate a normal human cervical disc. When people suffer from cervical spondylosis or acute cervical disc herniation and require surgical treatment, the diseased disc will be removed, and then the artificial disc will be placed in the position of the original disc to replace it and perform the corresponding function, thereby achieving the purpose of retaining the motion segment and reducing the secondary degeneration of adjacent segments. However, the existing artificial disc structure is relatively complex and cannot well perform the functions of the original disc. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an artificial intervertebral disc, which has a relatively simple structure and can well realize the functions of the original intervertebral disc.

[0004] The artificial intervertebral disc of the present invention comprises an upper end plate, an inner core and a lower end plate, the lower end of the inner core is snap-connected to the lower end plate, the upper end of the inner core is spherical, a spherical groove matching the upper end of the inner core is provided on the lower side surface of the upper end plate, the upper end of the inner core is located in the spherical groove, a circumferentially arranged support plate is provided on the outer side wall of the inner core, the support plate is located between the upper end plate and the lower end plate, and the support plate abuts against the upper side surface of the lower end plate.

[0005] The artificial intervertebral disc of the present invention, wherein the inner core is cylindrical, the lower end of the inner core is provided with a radial flange, the upper side surface of the lower end plate is provided with a cylindrical groove, the radial flange is located in the groove, and the groove diameter of the groove is smaller than the diameter of the radial flange.

[0006] The artificial intervertebral disc of the present invention, wherein the lower end plate comprises a lower end plate body and an upper baffle, the upper baffle is fixedly arranged on the upper side surface of the lower end plate body, the lower end plate body is provided with a circular groove, the upper baffle is provided with a circular through hole corresponding to the circular groove, the circular groove and the circular through hole constitute the clamping slot, the radial flange is located in the circular groove, the aperture of the circular through hole is smaller than the diameter of the radial flange, and the support plate abuts against the upper side surface of the upper baffle.

[0007] The artificial intervertebral disc of the present invention, wherein the lower end surface of the inner core is an arc concave surface, there is a gap between the outer side wall of the radial flange and the groove wall of the circular groove, and there is also a gap between the hole wall of the circular through hole and the outer peripheral wall of the inner core.

[0008] The artificial intervertebral disc of the present invention, wherein the edge of the support plate abuts against the upper side surface of the upper baffle plate, the support plate and the upper baffle plate are arranged at an angle, and the angle between the support plate and the upper baffle plate is an acute angle.

[0009] The artificial intervertebral disc of the present invention, wherein the lower side of the upper end plate is fixedly provided with an inverted truncated cone-shaped support seat, the lower side of the support seat is provided with the spherical groove, and the maximum angle between the upper end plate and the upper baffle is 8°.

[0010] In the artificial intervertebral disc of the present invention, the upper side surface of the upper end plate and the lower side surface of the lower end plate body are each provided with a porous coating.

[0011] In the artificial intervertebral disc of the present invention, the upper end plate and the lower end plate are both disc-shaped, the support plate is also disc-shaped, and the thickness of the support plate gradually increases from the edge to the inner core.

[0012] The difference between the artificial intervertebral disc of the present invention and the prior art is that the lower end of the inner core of the present invention is connected to the lower end plate by snapping, the upper end of the inner core is rotatably matched with the spherical groove of the upper end plate, and the inner core is supported on the upper side of the lower end plate by the support plate. When in use, the artificial intervertebral disc is placed between the upper and lower vertebral bodies of the patient, the upper vertebral body is against the upper side of the upper end plate, and the lower vertebral body is against the lower side of the lower end plate. Since the upper end plate can rotate relative to the inner core, it can adapt to the movement of the vertebral body. It can be seen that the structure of the present invention is relatively simple, and the function of the original intervertebral disc can be well realized.

[0013] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a front view of the artificial intervertebral disc of the present invention;

[0015] Figure 2 It is a front cross-sectional view of the artificial intervertebral disc of the present invention (when the upper end plate and the lower end plate form a maximum angle);

[0016] Figure 3 It is a front cross-sectional view of the artificial intervertebral disc of the present invention (when the upper end plate is parallel to the lower end plate);

[0017] Figure 4 It is a left view (also a right view) of the artificial intervertebral disc of the present invention;

[0018] Figure 5 It is a left sectional view (also a right sectional view) of the artificial intervertebral disc of the present invention;

[0019] Figure 6 A bottom view of the upper end plate of the present invention;

[0020] Figure 7 It is a front view of the kernel in the present invention;

[0021] Figure 8 is a front cross-sectional view of the core of the present invention;

[0022] Fig. 9 A top view of the core of the present invention;

[0023] Fig.10 A bottom view of the kernel of the present invention;

[0024] Fig.11 is a top view of the lower end plate of the present invention;

[0025] Fig.12 It is a schematic structural diagram of the lower end plate in the present invention. DETAILED DESCRIPTION

[0026] like Figure 1 As shown, combined with Figure 2-12 As shown, the artificial intervertebral disc of the present invention comprises an upper end plate 2, an inner core 6 and a lower end plate 5, the lower end of the inner core 6 is snap-connected to the lower end plate 5, the upper end of the inner core 6 is spherical, a spherical groove 9 matching the upper end of the inner core 6 is provided on the lower side surface of the upper end plate 2, the upper end of the inner core 6 is located in the spherical groove 9, a circumferentially arranged support plate 4 is provided on the outer side wall of the inner core 6, the support plate 4 is located between the upper end plate 2 and the lower end plate 5, and the support plate 4 abuts against the upper side surface of the lower end plate 5. Since the upper end plate 2 is sleeved on the spherical upper end of the inner core 6 through the spherical groove 9 on itself, the upper end plate 2 can rotate relative to the upper end of the inner core 6, thereby adapting to the rotation of the patient's neck.

[0027] like Figure 2 As shown, combined with Figure 3 , 5 7-10, the artificial intervertebral disc of the present invention, wherein the core 6 is cylindrical, the lower end of the core 6 is provided with a radial flange 7, the upper side surface of the lower end plate 5 is provided with a cylindrical clamping groove 14, the radial flange 7 is located in the clamping groove 14, and the notch diameter of the clamping groove 14 is smaller than the diameter of the radial flange 7. What is described here is a specific way in which the lower end of the core 6 is clamped and connected to the lower end plate 5. Since the notch diameter of the clamping groove 14 is smaller than the diameter of the radial flange 7, the radial flange 7 at the lower end of the core 6 will not fall off from the clamping groove 14.

[0028] like Fig.11 , 12As shown, the artificial intervertebral disc of the present invention, wherein the lower end plate 5 includes a lower end plate body 12 and an upper baffle plate 10, the upper baffle plate 10 is fixedly arranged on the upper side surface of the lower end plate body 12, the lower end plate body 12 is provided with a circular groove 13, the upper baffle plate 10 is provided with a circular through hole 11 corresponding to the circular groove 13, the circular groove 13 and the circular through hole 11 constitute the clamping groove 14, the radial flange 7 is located in the circular groove 13, the aperture of the circular through hole 11 is smaller than the diameter of the radial flange 7 (that is, the notch diameter of the above-mentioned clamping groove 14 is smaller than the diameter of the radial flange 7, because the circular through hole 11 is located at the notch position of the clamping groove 14), and the support plate 4 abuts against the upper side surface of the upper baffle plate 10. When the inner core 6 is snap-connected to the lower end plate 5, the radial flange 7 at the lower end of the inner core 6 is first placed in the circular groove 13 of the lower end plate body 12, and then the upper baffle 10 is fixed to the upper side surface of the lower end plate body 12, that is, the radial flange 7 is restricted in the circular groove 13 by the upper baffle 10, so that it cannot escape from the circular groove 13.

[0029] like Figure 2 , 3 As shown in , 5 , the artificial intervertebral disc of the present invention, wherein the lower end surface of the inner core 6 is a circular arc concave surface 8, there is a gap between the outer wall of the radial flange 7 and the groove wall of the circular groove 13, and there is also a gap between the hole wall of the circular through hole 11 and the outer peripheral wall of the inner core 6.

[0030] The reason why the lower end surface of the inner core 6 is designed as an arc concave surface 8 is that when the artificial intervertebral disc is placed between the two vertebrae of the patient's cervical spine, the inner core 6 can produce appropriate elastic deformation as the cervical spine moves, that is, the elastic deformation of the inner core 6 between the upper end plate 2 and the lower end plate 5 can achieve a buffering and vibration reduction effect to adapt to the movement of the cervical spine.

[0031] The reason why there are gaps between the outer wall of the radial flange 7 and the groove wall of the circular groove 13 and between the hole wall of the circular through hole 11 and the outer peripheral wall of the inner core 6 is that after the artificial intervertebral disc is placed between the two vertebral bodies of the patient's cervical spine, the inner core 6 can be appropriately displaced relative to the lower end plate 5 with the movement of the cervical spine, that is, the upper end plate 2 can be appropriately displaced relative to the lower end plate 5 through the inner core 6 to adapt to the movement of the cervical spine. In this embodiment, the gap between the outer wall of the radial flange 7 and the groove wall of the circular groove 13 is set to 1-2 mm, and accordingly, the gap between the hole wall of the circular through hole 11 and the outer peripheral wall of the inner core 6 should also be set to 1-2 mm.

[0032] The buffering and vibration reduction can be achieved between the upper end plate 2 and the lower end plate 5, and the upper end plate 2 can be appropriately displaced relative to the lower end plate 5, all of which simulate the function of a real intervertebral disc in order to adapt to the movement of the cervical spine.

[0033] like Figure 2 , 3 As shown in Figures 5 and 6, the artificial intervertebral disc of the present invention, wherein the edge of the support plate 4 abuts against the upper side surface of the upper baffle 10, the support plate 4 and the upper baffle 10 are arranged at an angle, and the angle between the support plate 4 and the upper baffle 10 is an acute angle, and the acute angle is 3°. The reason why the support plate 4 is arranged obliquely on the upper baffle 10 is the same as the aforementioned design of the lower end surface of the inner core 6 as the arc concave surface 8, both of which are to enable the inner core 6 to produce appropriate elastic deformation with the movement of the cervical vertebra, that is, the elastic deformation of the inner core 6 between the upper end plate 2 and the lower end plate 5 realizes the effect of buffering and vibration reduction to adapt to the movement of the cervical vertebra.

[0034] like Figure 2 As shown, the lower side of the upper end plate 2 is fixedly provided with a support seat 3 in the shape of an inverted truncated cone, and the lower side of the support seat 3 is provided with the spherical groove 9. The maximum angle between the upper end plate 2 and the upper baffle 10 is 8°, that is, when the upper end plate 2 rotates around the inner core 6, the maximum angle between it and the lower end plate 5 is 8°. In order to achieve this purpose, only Figure 2 The structure of the support seat 3 and the support plate 4 is designed so that the left side of the upper end plate 2 rotates downward until it forms a maximum angle of 8° with the lower end plate 5. At this time, the left edge of the lower side surface of the support seat 3 just abuts against the upper left side surface of the support plate 4, so that the left side of the upper end plate 2 can no longer rotate downward around the core 6, which also achieves the purpose of the maximum angle between the upper end plate 2 and the lower end plate 5 being 8°. It should be noted that when the upper end plate 2 rotates to other directions around the core 6, its principle is the same as the above Figure 2 The situations shown are the same and will not be described again here.

[0035] like Figure 1 As shown, combined with Figure 2 , 3 As shown in Figures 4 and 5, the artificial intervertebral disc of the present invention, wherein the upper side surface of the upper end plate 2 and the lower side surface of the lower end plate body 12 are respectively provided with a porous coating 1, and the porous coating 1 is made of porous material, the purpose of which is to improve the fusion rate of the artificial intervertebral disc and the patient's cervical spine.

[0036] like Figure 6 As shown, combined with Figure 7-11 As shown, the upper end plate 2 and the lower end plate 5 are both disc-shaped, and the support plate 4 is also disc-shaped. The thickness of the support plate 4 gradually increases from the edge to the inner core 6.

[0037] The lower end of the inner core 6 of the present invention is connected to the lower end plate 5 by snapping, and the upper end of the inner core 6 is rotatably matched with the spherical groove 9 of the upper end plate 2, and the inner core 6 is supported on the upper side of the lower end plate 5 by the support plate 4. When in use, the artificial intervertebral disc is placed between the upper and lower vertebral bodies of the patient, the upper vertebral body is against the upper side of the upper end plate 2, and the lower vertebral body is against the lower side of the lower end plate 5. Since the upper end plate 2 can rotate relative to the inner core 6, it can adapt to the movement of the vertebral body. It can be seen that the structure of the present invention is relatively simple, and the function of the original intervertebral disc can be well realized.

[0038] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “front”, “back”, “left”, “right”, and “middle” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An artificial intervertebral disc, characterized in that: The invention comprises an upper end plate, an inner core and a lower end plate, wherein the lower end of the inner core is snap-connected to the lower end plate, the upper end of the inner core is spherical, a spherical groove matching the upper end of the inner core is provided on the lower side surface of the upper end plate, the upper end of the inner core is located in the spherical groove, a circumferentially arranged support plate is provided on the outer side wall of the inner core, the support plate is located between the upper end plate and the lower end plate, and the support plate abuts against the upper side surface of the lower end plate, The lower end of the inner core is provided with a radial flange, the upper side surface of the lower end plate is provided with a cylindrical slot, the radial flange is located in the slot, and the slot diameter of the slot is smaller than the diameter of the radial flange. The lower end plate comprises a lower end plate body and an upper baffle, wherein the upper baffle is fixedly arranged on the upper side surface of the lower end plate body, the lower end plate body is provided with a circular groove, the upper baffle is provided with a circular through hole corresponding to the circular groove, the circular groove and the circular through hole constitute the clamping slot, the radial flange is located in the circular groove, the aperture of the circular through hole is smaller than the diameter of the radial flange, and the support plate abuts against the upper side surface of the upper baffle, The lower end surface of the inner core is an arc concave surface, the edge of the support plate abuts against the upper side surface of the upper baffle plate, the support plate and the upper baffle plate are arranged at an angle, and the angle between the support plate and the upper side surface of the upper baffle plate is an acute angle. The lower side of the upper end plate is fixed with an inverted truncated cone-shaped support seat, the lower side of the support seat is provided with the spherical groove, and the maximum angle between the upper end plate and the upper baffle is 8°. There is a gap between the outer side wall of the radial flange and the groove wall of the circular groove, and there is also a gap between the hole wall of the circular through hole and the outer peripheral wall of the inner core.

2. The artificial intervertebral disc according to claim 1, characterized in that: The upper side surface of the upper end plate and the lower side surface of the lower end plate body are each provided with a porous coating.

3. The artificial intervertebral disc according to any one of claims 1 to 2, characterized in that: The upper end plate and the lower end plate are both disc-shaped, and the support plate is also disc-shaped. The thickness of the support plate gradually increases from the edge to the inner core.

Images