Intervertebral joint implant

Abstract

The present invention discloses an intervertebral joint implant, comprising an upper vertebral plate that fits the upper vertebra and an inferior vertebral plate that fits the inferior vertebra. A nucleus pulposus assembly is provided between the inferior vertebral plate and the upper vertebral plate to enable universal rotation of the two. The upper and inferior vertebral plates are respectively provided with connecting holes that extend inward or through the sides thereof. The hole walls of the connecting holes are provided with openings with a circumference angle of less than 180°. The openings are respectively provided at one end of the upper and inferior vertebral plates that faces away from the nucleus pulposus assembly. The internal threads of the connecting holes are matched with connecting posts. The connecting posts are provided with trapezoidal threads, the trapezoidal threads having a wide end and a narrow end, the narrow end being connected to the connecting posts. The side walls of the connecting posts are provided with a defective portion that matches the opening. The implant adopts a screw-in and screw-out gripping blade structure, which ensures reliable connection, a small notch, and no foreign body sensation after implantation. The overall function is complete and the practicality is strong.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and more particularly to an intervertebral joint implant. Background Art

[0002] In the human anatomy system, the spine is in a retractable state in the human body. It can withstand tension, compression, bending, and torsion, as well as loads and bends. Currently, the standard surgical method for treating intervertebral disc disease is to remove the diseased intervertebral disc, then place a fusion cage between the vertebrae, and fuse the vertebrae together by placing nails and rods outside the cone for fixation. As a result of the fusion, the upper and lower sides of the fused vertebrae are subjected to pressure from the additional vertebrae. This additional pressure will cause the fused vertebrae to degenerate faster, which is not conducive to the long-term stability of the vertebrae. This degeneration will cause the patient to continue to undergo more fusion surgeries between adjacent vertebrae. In response to this, the present invention proposes an intervertebral joint implant. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an intervertebral joint implant.

[0004] In order to solve the above technical problems, the purpose of the present invention is achieved as follows: an intervertebral joint implant involved in the present invention includes an upper vertebral plate fitted with the upper vertebra and an inferior vertebral plate fitted with the inferior vertebra, and a nucleus pulposus component is provided between the inferior vertebral plate and the upper vertebral plate to realize universal rotation of the two. The upper vertebral plate and the inferior vertebral plate are respectively provided with connecting holes that penetrate or pass through from their sides, and the hole walls of the connecting holes are provided with openings with a circumferential angle of less than 180°. The openings are respectively provided at one end of the upper vertebral plate and the inferior vertebral plate facing away from the nucleus pulposus component, and the internal threads of the connecting holes are matched with connecting columns, and the connecting columns are provided with trapezoidal threads, and the trapezoidal threads have a wide side end and a narrow side end, and the narrow side end is connected to the connecting column, and the side walls of the connecting column are cut with a defective portion that matches the opening.

[0005] The present invention is further configured such that: the defective portion divides the trapezoidal thread into multiple segments of spiral thread monomers, and at least one end of the thread monomer has a cutting tooth.

[0006] The present invention is further configured such that: a notch is provided on the cutting fang.

[0007] The present invention is further configured such that one end of the connecting column has a guide portion and the other end has a rotating portion.

[0008] The present invention is further configured as follows: a stop screw hole is provided at the opening of the connection hole, and the inner thread of the stop screw hole is matched with a stop screw plug whose end portion abuts against the connection column.

[0009] The present invention is further configured as follows: the nucleus pulposus component is composed of a first core, an upper pad arranged at the upper end of the first core, and a lower pad arranged at the lower end of the first core, one end of the upper pad is connected to the upper vertebral plate, and the other end is provided with a first inner spherical surface, one end of the lower pad is connected to the lower vertebral plate, and the other end is provided with a second inner spherical surface, one end of the first core is provided with a first outer spherical surface that is closely attached to the first inner spherical surface, and the other end is provided with a second outer spherical surface that is closely attached to the second inner spherical surface.

[0010] The present invention is further configured such that: the upper pad and the upper vertebral plate, and the lower pad and the lower vertebral plate are both detachably connected via a snap-fit ​​structure;

[0011] The upper liner is provided with a first clamping ring, the upper vertebral plate is provided with a first clamping groove adapted to the first clamping ring, the lower liner is provided with a second clamping ring, and the lower vertebral plate is provided with a second clamping groove adapted to the second clamping ring.

[0012] The present invention is further configured as follows: the nucleus pulposus component is composed of a second core and a seat, one end of the seat is connected to the inferior vertebral plate, and the other end is provided with a cone, one end of the second core is provided with a slot for the cone to fit in, and the other end is provided with a third outer spherical surface, and the superior vertebral plate is provided with a third inner spherical surface that fits the third outer spherical surface.

[0013] The present invention is further configured as follows: a developing needle mounting hole is provided on the upper lamina and / or the lower lamina.

[0014] The present invention is further configured such that groove structures are respectively arranged on the end surface of the superior vertebral plate facing away from the nucleus pulposus component and the end surface of the inferior vertebral plate facing away from the nucleus pulposus component.

[0015] In summary, the present invention has the following beneficial effects:

[0016] 1. The screw-in and screw-out blade structure ensures reliable connection, small incision, and no foreign body sensation after implantation;

[0017] 2. The inverted trapezoidal thread is different from the conventional trapezoidal thread. It has radial grip when locking into the vertebra, making the connection more reliable.

[0018] 3. The upper and lower spherical surfaces are arranged in coordination to enable the implant to achieve universal rotation, which is similar to the mobility of the human spine and is flexible after implantation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0021] Figure 3It is a partial structural schematic diagram of the present invention;

[0022] Figure 4 This is a schematic diagram of the overall structure of the connecting column used in the present invention;

[0023] Figure 5 This is a schematic diagram of the internal structure of the connecting column of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the present invention for reflecting the incision of the canine and the missing groove;

[0025] Figure 7 This is a schematic diagram of the structure of the stop screw plug used in the present invention;

[0026] Figure 8 It is a schematic diagram of the structure of the upper liner of the present invention;

[0027] Figure 9 It is a schematic structural diagram of the present invention for embodying the first pith core;

[0028] Figure 10 is a schematic diagram of the overall structure of another embodiment of the present invention;

[0029] Figure 11 This is a schematic diagram of the structure of the inferior lamina in another embodiment;

[0030] Figure 12 It is a structural diagram of the second pith core of the present invention. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the patent claims of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0033] Example 1

[0034] See also Figures 1 to 9As shown, an intervertebral joint implant involved in this embodiment includes an upper vertebral plate 1 fitted with the upper vertebra and an inferior vertebral plate 2 fitted with the inferior vertebra, a nucleus pulposus component 3 is provided between the inferior vertebral plate 2 and the upper vertebral plate 1 to enable the two to rotate in a universal direction, the upper vertebral plate 1 and the inferior vertebral plate 2 are respectively provided with a connecting hole 4 that penetrates or passes through from the side surface thereof, an opening portion 5 with a circumferential angle less than 180° is provided on the hole wall of the connecting hole 4, and the opening portion 5 is respectively provided at one end of the upper vertebral plate 1 and the inferior vertebral plate 2 facing away from the nucleus pulposus component 3, the internal thread of the connecting hole 4 is matched with a connecting column 6, and the connecting column 6 is provided with a trapezoidal thread 7, the trapezoidal thread 7 having a wide side end 71 and a narrow side end 72, the narrow side end 72 is connected to the connecting column 6, and the side wall of the connecting column 6 is cut with a defect portion 8 that is compatible with the opening portion 5.

[0035] Furthermore, the defective portion 8 divides the trapezoidal thread 7 into multiple segments of spiral thread monomers 9 , and at least one end of the thread monomer 9 has a cutting tooth 10 .

[0036] Furthermore, a notch 11 is formed on the cutting tooth 10, and the notch 11 is a semi-cylindrical groove.

[0037] Furthermore, the connecting column 6 has a guide portion 61 at one end and a rotating portion 62 at the other end. The rotating portion 62 includes a hexagonal hole extending in the axial direction for being screwed in using a wrench.

[0038] Furthermore, the opening of the connecting hole 4 is provided with a stop screw hole 12, the internal thread of the stop screw hole 12 is matched with a stop screw plug 13 whose end rests against the connecting column, and one end of the stop screw plug 13 is provided with an inner plum blossom hole extending along the axial direction.

[0039] Furthermore, the nucleus pulposus component 3 is composed of a first core 301, an upper pad 302 provided at the upper end of the first core, and a lower pad 303 provided at the lower end of the first core. One end of the upper pad 302 is connected to the upper vertebral plate, and the other end is provided with a first inner spherical surface 304. One end of the lower pad 303 is connected to the lower vertebral plate, and the other end is provided with a second inner spherical surface (not marked in the figure). One end of the first core 301 is provided with a first outer spherical surface 305 that is close to the first inner spherical surface, and the other end is provided with a second outer spherical surface 306 that is close to the second inner spherical surface.

[0040] Furthermore, the upper pad 302 and the upper vertebral plate 1, as well as the lower pad 303 and the lower vertebral plate 2 are detachably connected via a snap-fit ​​structure; the upper pad 302 is provided with a first snap ring 307, and the upper vertebral plate 1 is provided with a first snap groove (not marked in the figure) adapted for the first snap ring; the lower pad 303 is provided with a second snap ring 308, and the lower vertebral plate 2 is provided with a second snap groove (not marked in the figure) adapted for the second snap ring.

[0041] In this embodiment, the intervertebral implant is designed with maximum dimensions consistent with those of the human intervertebral disc. During installation, the connecting post 6 is first rotated to the appropriate angle, exposing the defect 8 within the opening 5. The opening 5 then has no exposed threads. The intervertebral joint implant is then placed in the intervertebral joint where the disc has been removed. A hexagonal wrench is then used to rotate the connecting post 6 until the threads engage the cortical bone of the vertebral body. While the hexagonal wrench is held stationary, a torx wrench is used to screw the retaining screw plug into the retaining screw hole 12 at one end of the connecting hole and tighten with pressure to complete the procedure.

[0042] The arrangement of the cutting teeth 10 enables the trapezoidal thread 7 to be embedded into the cortical bone of the vertebral body with less effort.

[0043] The formation of the notch 11 allows the incisor tooth 10 to have a smaller contact area and a greater pressure when contacting the vertebral body, making it easier for the incisor tooth 10 to be embedded in the cortical bone of the vertebral body.

[0044] The setting of the stop screw hole 12 and the stop screw plug 13 plays a role in locking and positioning after the connecting column 6 bites the vertebral body.

[0045] Example 2

[0046] See also Figures 10 to 12 As shown, the present embodiment involves an intervertebral joint implant, which replaces the overall structure of the nucleus pulposus component 3 on the basis of Example 1, and is further configured as follows: the nucleus pulposus component 3 is composed of a second core 309 and a seat 310, one end of the seat 310 is connected to the inferior vertebral plate 2, and the other end is provided with a cone 311, one end of the second core 309 is provided with a slot 312 for the cone to fit in, and the other end is provided with a third outer spherical surface 313, and the superior vertebral plate 1 is provided with a third inner spherical surface (not marked in the figure) that fits the third outer spherical surface.

[0047] Example 3

[0048] See also Figure 1 and Figure 10 As shown, the intervertebral joint implant involved in this embodiment is further configured, based on embodiments 1 and 2, in that the upper vertebral plate 1 and the lower vertebral plate 2 are provided with imaging needle mounting holes 14 .

[0049] In this embodiment, the developing needle installation hole 14 is provided to place a developing needle so that the doctor can confirm the position of the implant during surgery.

[0050] Example 4

[0051] See also Figure 1 and Figure 10As shown, the intervertebral joint implant involved in this embodiment is further configured on the basis of Examples 1 and 2, with groove structures 15 respectively arranged on the end surface of the upper vertebral plate 1 facing away from the nucleus pulposus component 3 and the end surface of the lower vertebral plate 2 facing away from the nucleus pulposus component 3.

[0052] In this embodiment, the groove structure 15 is provided to provide a larger contact area when fitting against the vertebral surface, thereby providing stability and enhancing blood circulation.

[0053] The superior and inferior vertebral plates, retaining screws, and connecting posts are all made of cobalt-chromium-molybdenum alloy conforming to the YY0605 standard, titanium alloy conforming to the GB / T13810 standard, or other biocompatible metal materials. The first and second cores are made of cobalt-chromium-molybdenum alloy, polycrystalline diamond (PCD), and alumina ceramics; the upper and lower liners are made of ultra-high molecular weight polyethylene and polyethylene containing vitamin E.

[0054] The intervertebral joint implant involved in the present invention adopts a screw-in and screw-out gripping blade structure, which ensures reliable connection, small notch, and no foreign body sensation after implantation; the inverted trapezoidal thread is different from the conventional trapezoidal thread. During the process of locking into the vertebra, it has radial gripping force, making the connection more reliable; and the upper and lower sets of spherical surfaces are arranged in a coordinated manner, so that the implant can achieve universal rotation, which is similar to the mobility of the human spine. After implantation, it is flexible, has complete overall functions, and is highly practical.

[0055] Unless otherwise specified, in the present invention, if there are terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicating orientation or positional relationship, they are based on the orientation or positional relationship actually shown and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limiting this patent. For those skilled in the art, the specific meanings of the above terms can be understood in combination with the embodiments and according to specific circumstances.

[0056] Unless otherwise specified or limited, the terms "disposed," "connected," and "connected" in this disclosure should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0057] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. An intervertebral joint implant comprising an upper vertebral plate fitted with an upper vertebra, an inferior vertebral plate fitted with an inferior vertebra, a nucleus pulposus assembly disposed between the inferior and superior vertebral plates to enable universal rotation of the two plates, characterized in that: The superior vertebral plate and the inferior vertebral plate are respectively provided with connecting holes that penetrate inward or pass through from the side thereof, and the hole wall of the connecting hole is provided with an opening portion with a circumference angle less than 180°, and the opening portion is respectively provided at one end of the superior vertebral plate and the inferior vertebral plate facing away from the nucleus pulposus component, and the inner thread of the connecting hole is matched with a connecting column, and the connecting column is provided with a trapezoidal thread, the trapezoidal thread has a wide side end and a narrow side end, and the narrow side end is connected to the connecting column, and a defect portion that is adapted to the opening portion is cut on the side wall of the connecting column; when the connecting column is rotated to a suitable angle, there is no exposed thread at the opening portion, and the connecting column continues to be rotated, and the thread on the connecting column is embedded in the cortical bone of the vertebral body.

2. The intervertebral joint implant according to claim 1, characterized in that: The defective portion divides the trapezoidal thread into multiple sections of spiral thread monomers, and at least one end of the thread monomer has a cutting tooth.

3. The intervertebral joint implant according to claim 2, characterized in that: The cutting fangs are provided with notches.

4. The intervertebral joint implant according to claim 3, characterized in that: One end of the connecting column is provided with a guide portion, and the other end is provided with a rotating portion.

5. The intervertebral joint implant according to claim 4, characterized in that: The opening of the connecting hole is provided with a stop screw hole, and the inner thread of the stop screw hole is matched with a stop screw plug whose end portion abuts against the connecting column.

6. The intervertebral joint implant according to any one of claims 1 to 5, characterized in that: The nucleus pulposus component consists of a first core, an upper pad arranged at the upper end of the first core, and a lower pad arranged at the lower end of the first core. One end of the upper pad is connected to the upper vertebral plate, and the other end is provided with a first inner spherical surface. One end of the lower pad is connected to the lower vertebral plate, and the other end is provided with a second inner spherical surface. One end of the first core is provided with a first outer spherical surface that is closely attached to the first inner spherical surface, and the other end is provided with a second outer spherical surface that is closely attached to the second inner spherical surface.

7. The intervertebral joint implant according to claim 6, characterized in that: The upper pad and the upper vertebral plate, as well as the lower pad and the lower vertebral plate, are detachably connected via a snap-fit ​​structure. The upper liner is provided with a first clamping ring, the upper vertebral plate is provided with a first clamping groove adapted to the first clamping ring, the lower liner is provided with a second clamping ring, and the lower vertebral plate is provided with a second clamping groove adapted to the second clamping ring.

8. The intervertebral joint implant according to any one of claims 1 to 5, characterized in that: The nucleus pulposus component consists of a second core and a seat, one end of the seat is connected to the lower vertebral plate, and the other end is provided with a cone, one end of the second core is provided with a slot for the cone to fit in, and the other end is provided with a third outer spherical surface, and the upper vertebral plate is provided with a third inner spherical surface that fits the third outer spherical surface.

9. The intervertebral joint implant according to claim 1, characterized in that: The upper vertebral plate and / or the lower vertebral plate are provided with a developing needle mounting hole.

10. The intervertebral joint implant according to claim 1, characterized in that: The end surface of the superior vertebral plate facing away from the nucleus pulposus component and the end surface of the inferior vertebral plate facing away from the nucleus pulposus component are respectively provided with groove structures.

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