Interbody Fusion Cage

Abstract

The present invention provides an intervertebral fusion device, comprising: an intervertebral fusion device body, comprising a frame structure, the frame structure having an initial state in which the intervertebral fusion device body has a curved shape and an assembly state in which the intervertebral fusion device has a straight shape, and under preset conditions, the frame structure can be transformed from the assembly state to the initial state. The technical solution of the present invention effectively solves the problem in the prior art that the prosthesis is not well positioned and the prosthesis shape cannot achieve the maximum amount of bone support.

Description

Technical Field

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

[0002] Posterior lumbar decompression and interbody fusion is the most commonly used surgical method for treating common lumbar diseases such as lumbar disc herniation and lumbar spinal stenosis. It is performed using three surgical methods: Posterior Lumbar Interbody Fusion (PLIF), Transforaminal Lumbar Interbody Fusion (TLIF), and Minimally Invasive Surgery (Transforaminal Lumbar Interbody Fusion, MIS-TLIF). In recent decades of clinical practice, all three surgical methods have achieved good clinical efficacy; however, the surgical entry and direction are still a difficult point in prosthesis implantation. The best prosthesis position should be that the prosthesis is placed parallel to the coronal plane, the prosthesis shape is similar to the vertebral body shape, and the maximum amount of bone support is achieved. Summary of the invention

[0003] The present invention aims to provide an intervertebral fusion device to solve the problems in the prior art where the prosthesis is not well positioned and the shape of the prosthesis cannot achieve the maximum bone support.

[0004] In order to achieve the above-mentioned purpose, the present invention provides an intervertebral fusion device, comprising: an intervertebral fusion device body, comprising a frame structure, the frame structure having an initial state in which the intervertebral fusion device body has a curved shape and an assembly state in which the intervertebral fusion device has a straight shape, and under preset conditions, the frame structure can be transformed from the assembly state to the initial state.

[0005] Furthermore, the frame structure includes a first plate body and a second plate body that are arranged opposite to each other, and the first plate body and the second plate body are transformed between an assembled state and an initial state by straightening and bending or stretching and contracting.

[0006] Furthermore, one of the first plate body and the second plate body is in a flat plate shape, and the other of the first plate body and the second plate body is in a wavy plate shape. In an initial state, the flat plate-shaped side wall is in a curved state, and the wavy plate-shaped side wall extends along a curve. In an assembled state, the flat plate-shaped side wall is in a straight state, and the wavy plate-shaped side wall extends along a straight line.

[0007] Furthermore, the first plate body and the second plate body are both in the shape of a wave plate. In an initial state, the first plate body and the second plate body extend along a curve. In an assembled state, the first plate body and the second plate body extend along a straight line.

[0008] Furthermore, the intervertebral fusion cage further comprises a plurality of ribs alternately arranged between the first plate body and the second plate body, wherein the ribs are wavy in shape to adapt to the transition of the intervertebral fusion cage body between the initial state and the assembled state.

[0009] Furthermore, a plurality of ribs are combined into two separate deformable support nets, and the two deformable support nets are respectively arranged on two end surfaces formed by the first plate body and the second plate body to form a hollow structure of the intervertebral fusion cage body.

[0010] Furthermore, the ribs, the first plate body and the second plate body are all made of memory alloy.

[0011] Furthermore, the ribs, the first plate body and the second plate body each include a plurality of support units, and the support unit includes a cylindrical structure with a polygonal or circular longitudinal section, and the axis of the cylindrical structure is perpendicular to the thickness direction of the intervertebral fusion cage body.

[0012] Furthermore, the intervertebral fusion cage body further comprises a connecting portion, in which a connecting hole is arranged, and the first end of the first plate body and the first end of the second plate body are respectively arranged on both sides of the connecting portion.

[0013] Furthermore, the frame structure also includes a third plate body, and the third plate body is arranged between the second end of the first plate body and the second end of the second plate body.

[0014] By applying the technical solution of the present invention, the intervertebral fusion device body is implanted between the two vertebrae to be fused in the patient when the frame structure is in an assembled state, so that the intervertebral fusion device body enters the affected area in a straight shape, which is convenient for implantation. When the preset conditions are reached after implantation, the frame structure changes to the initial state, so that the intervertebral fusion device body can be in a curved state after implantation, reach an ideal placement position and fit the curvature trend in the vertebrae, providing ideal bone support. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 It shows a schematic structural diagram of the first embodiment of the intervertebral fusion device according to the present invention in an initial state;

[0017] Figure 2 Shows Figure 1 A schematic diagram of the structure of the intervertebral fusion cage in an assembled state;

[0018] Figure 3 Shows Figure 2 A schematic structural diagram of a first plate body and a second plate body of an intervertebral fusion device;

[0019] Figure 4 It shows a schematic structural diagram of a first plate body and a second plate body in an assembled state according to a second embodiment of the intervertebral fusion device of the present invention;

[0020] Figure 5 It shows a schematic structural diagram of the first plate body and the second plate body in an assembled state according to the third embodiment of the intervertebral fusion device of the present invention;

[0021] Figure 6 Shows Figure 2 Schematic diagram of the three-dimensional structure of the intervertebral fusion cage;

[0022] Figure 7 Shows Figure 6 A schematic diagram of the longitudinal cross-sectional structure of a first plate of an intervertebral fusion cage; and

[0023] Figure 8 A schematic structural diagram of the intervertebral fusion device in the initial state according to the fourth embodiment of the present invention is shown.

[0024] The above drawings include the following reference numerals:

[0025] 10. First plate body; 20. Second plate body; 30. Third plate body; 40. Ribs; 40a. Upper deformable support net; b. Middle gap; c. Support unit; 50. Connecting part; 60. Connecting hole. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] Embodiment 1:

[0028] The intervertebral fusion device of this embodiment includes an intervertebral fusion device body, which includes a frame structure. The frame structure has an initial state in which the intervertebral fusion device body is curved and an assembly state in which the intervertebral fusion device is straight. Under preset conditions, the frame structure can be transformed from the assembly state to the initial state.

[0029] By applying the technical solution of this embodiment, the intervertebral fusion device body is implanted between the two vertebrae to be fused in the patient when the frame structure is in an assembled state, so that the intervertebral fusion device body enters the affected area in a straight shape, which is convenient for implantation. When the preset conditions are reached after implantation, the frame structure changes to the initial state, so that the intervertebral fusion device body can be in a curved state after implantation, reach the ideal placement position and fit the curvature trend in the vertebrae, providing ideal bone support.

[0030] like Figure 1and Figure 2 As shown, the frame structure of this embodiment includes a first plate body 10 and a second plate body 20 arranged opposite to each other, and the first plate body 10 and the second plate body 20 are transformed between the assembly state and the initial state by straightening and bending or stretching and contracting. The frame structure also includes a third plate body 30, which is arranged between the second end of the first plate body 10 and the second end of the second plate body 20. The intervertebral fusion cage body forms a completely closed structure in the circumferential direction.

[0031] Specifically, Figure 3 As shown, the first plate body 10 of this embodiment is in a flat plate shape, and the second plate body 20 is in a wavy plate shape. In the initial state, the first plate body 10 is in a curved state, and the second plate body 20 extends along a curve, so that the intervertebral fusion device body is curved; in the assembled state, the first plate body 10 is straightened and in a straight state, and the second plate body 20 is stretched and extends along a straight line, so that the intervertebral fusion device body is straight.

[0032] like Figure 6 As shown, the intervertebral fusion device of this embodiment further includes a plurality of ribs 40 staggered between the first plate body 10 and the second plate body 20, and the ribs 40 are wavy. The wavy ribs 40 can adapt to the transition between the initial state and the assembled state of the intervertebral fusion device body by bending, straightening, shrinking, stretching, and other deformations.

[0033] Preferably, the ribs 40, the first plate 10, the second plate 20 and the third plate 30 of this embodiment are all made of nickel-titanium alloy by 3D printing technology. Nickel-titanium alloy is a memory alloy that can automatically restore its own plastic deformation to its original shape at a certain temperature. The initial state of the intervertebral fusion device of this embodiment is curved, and it can be plastically deformed to a straight assembly state under low temperature conditions. After being implanted in the patient's body, when the temperature rises to a preset temperature, the ribs 40, the first plate 10, the second plate 20 and the third plate 30 can be restored to the initial state under the memory ability of nickel-titanium alloy, so that it is close to the ideal shape and provides sufficient bone support.

[0034] Preferably, the ribs 40, the first plate body 10, the second plate body 20 and the third plate body 30 of this embodiment all include a plurality of support units c, such as Figure 7 As shown, the support unit c includes a cylindrical structure with a polygonal or circular longitudinal section, and the axis of the cylindrical structure is perpendicular to the thickness direction of the intervertebral fusion device body. This allows the size of the intervertebral fusion device body in the vertical direction to be changed through the compression and expansion of the cylindrical structure, thereby allowing the intervertebral fusion device body to enter between the two vertebrae with a smaller thickness, and expand after implantation to better fit the surfaces of the upper and lower vertebrae.

[0035] Specifically, Figure 6As shown, the plurality of ribs 40 of this embodiment are combined into an upper deformable support net 40a and a lower deformable support net (not shown in the figure), and the two deformable support nets are arranged at intervals on the two end surfaces formed by the first plate body 10 and the second plate body 20 and form a hollow gap b between the two, so that the intervertebral fusion device forms a hollow structure. The hollow gap b and the meshes of the two deformable support nets are connected to form an accommodation space. After the intervertebral fusion device is placed between the vertebral bodies of the patient, bone graft particles can be filled in the accommodation space to facilitate the survival of the bone graft particles and facilitate the patient's recovery.

[0036] like Figure 6 As shown, the intervertebral fusion device body of this embodiment further includes a connecting portion 50, in which a connecting hole 60 is provided, and the first end of the first plate body 10 and the first end of the second plate body 20 are respectively provided on both sides of the connecting portion 50. The connecting portion 50 is connected to the tool through the connecting hole 60 to facilitate the implantation of the intervertebral fusion device.

[0037] Embodiment 2:

[0038] The intervertebral fusion cage of this embodiment adjusts the shapes of the first plate body 10 and the second plate body 20. Figure 4 As shown, the first plate body 10 of this embodiment is in the shape of a wave plate, and the second plate body 20 is in the shape of a flat plate. In the initial state, the first plate body 10 extends along a curve, and the second plate body 20 is in a curved state, so that the intervertebral fusion device body is curved; in the assembled state, the first plate body 10 contracts and extends along a straight line, and the second plate body 20 is straightened and in a straight state, so that the intervertebral fusion device body is straight.

[0039] Embodiment three:

[0040] The intervertebral fusion cage of this embodiment adjusts the shapes of the first plate body 10 and the second plate body 20. Figure 5 As shown, the first plate body 10 and the second plate body 20 of this embodiment are both in the shape of a wavy plate. In the initial state, the first plate body 10 and the second plate body 20 extend along the curve, so that the intervertebral fusion device body is curved as a whole; in the assembled state, the first plate body 10 contracts and the second plate body 20 stretches so that the intervertebral fusion device body is straight as a whole.

[0041] Embodiment 4:

[0042] The intervertebral fusion device of this embodiment adjusts the angle between the communicating hole 60 and the first plate body 10 and the second plate body 20 in the initial state. Figure 8 As shown, the angle between the axis of the communicating hole 60 and the first plate body 10 and the second plate body 20 in this embodiment is smaller to adapt to the implantation angle and the position after implantation of the intervertebral fusion device.

[0043] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0044] The intervertebral fusion device body is in a straight state when the frame structure is in an assembled state. The intervertebral fusion device is implanted between the two vertebrae to be fused in the patient, so that the intervertebral fusion device body enters the affected area in a straight shape, which is convenient for implantation. When the preset conditions are reached after implantation, the frame structure changes to the initial state, so that the intervertebral fusion device body can be in a curved state after implantation, reaching the ideal placement position and matching the curvature trend in the vertebrae, providing ideal bone support.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intervertebral fusion cage, characterized in that: include: An intervertebral fusion device body, comprising a frame structure, wherein the frame structure has an initial state in which the intervertebral fusion device body is curved and an assembly state in which the intervertebral fusion device body is straight, and under preset conditions, the frame structure can be transformed from the assembly state to the initial state; The frame structure comprises a first plate body (10) and a second plate body (20) arranged opposite to each other, wherein the first plate body (10) and the second plate body (20) are transformed between the assembly state and the initial state by straightening and bending or stretching and contracting; One of the first plate body (10) and the second plate body (20) is in the shape of a flat plate, and the other of the first plate body (10) and the second plate body (20) is in the shape of a corrugated plate; in the initial state, the side wall of the flat plate is in a curved state, and the side wall of the corrugated plate extends along a curve; in the assembled state, the side wall of the flat plate is in a straight state, and the side wall of the corrugated plate extends along a straight line; The intervertebral fusion device further comprises a plurality of ribs (40) arranged alternately between the first plate body (10) and the second plate body (20), wherein the ribs (40) are wavy in shape to adapt to the transition of the intervertebral fusion device body between the initial state and the assembled state; The ribs (40), the first plate body (10) and the second plate body (20) all comprise a plurality of support units, the support units comprising a cylindrical structure with a polygonal or circular longitudinal section, the axis of the cylindrical structure being perpendicular to the thickness direction of the intervertebral fusion device body; A plurality of the ribs (40) are combined into an upper deformable support net (40a) and a lower deformable support net. The two deformable support nets are arranged at intervals on two end surfaces formed by the first plate body (10) and the second plate body (20) and form a hollow gap (b) between the two, so that the intervertebral fusion cage forms a hollow structure. The hollow gap (b) and the mesh holes of the two deformable support nets are connected to form an accommodation space.

2. The intervertebral fusion cage according to claim 1, characterized in that: The first plate body (10) and the second plate body (20) are both in the shape of a wave plate; in the initial state, the first plate body (10) and the second plate body (20) extend along a curve; in the assembled state, the first plate body (10) and the second plate body (20) extend along a straight line.

3. The intervertebral fusion cage according to claim 1, characterized in that: The ribs (40), the first plate body (10) and the second plate body (20) are all made of memory alloy.

4. The intervertebral fusion cage according to claim 1, characterized in that: The intervertebral fusion device body further comprises a connecting portion (50), in which a connecting hole (60) is provided, and the first end of the first plate body (10) and the first end of the second plate body (20) are respectively arranged on both sides of the connecting portion (50).

5. The intervertebral fusion cage according to claim 4, characterized in that: The frame structure further comprises a third plate body (30), wherein the third plate body (30) is arranged between the second end of the first plate body (10) and the second end of the second plate body (20).

Images