Fusioners and spinal implants

Abstract

The application discloses a fusion device and a spinal implant, the spinal implant comprising a frame body and a porous structure, the frame body comprising opposite first and second ends, the frame body being provided with a cavity, the cavity extending through the frame body in the direction from the first end to the second end; the porous structure comprising a first porous part, the first porous part being accommodated in the cavity and connected with the frame body, the first porous part comprising a first part, a second part and a third part distributed in sequence in the direction from the first end to the second end, the porosities of the first part and the third part being both greater than that of the second part. According to the application, the first part, the second part and the third part of the porous structure of the spinal implant are distributed in sequence in the direction from the first end to the second end of the frame body, and the porosities of the first part and the third part are both greater than that of the second part, so that the stress shielding of the spinal implant can be reduced, the bone ingrowth performance of the skeleton can be improved, and the risk of the middle part of the spinal implant being broken can be reduced.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more particularly to a fusion device and a spinal implant. Background Technology

[0002] Spinal implants such as fusion devices and artificial vertebrae are commonly used medical devices in spinal surgery. They are mainly used to implant into the human spine so that the spine and the spinal implant can grow and fuse together to achieve spinal recovery treatment.

[0003] To promote the fusion of the spine and spinal implants, the implants need to meet favorable mechanical requirements. However, in related technologies, the elastic modulus of spinal implants differs significantly from that of bone. When implanted, this can lead to stress shielding, which weakens bone ingrowth. Summary of the Invention

[0004] This application provides a spinal implant designed to address the problem in related technologies where the elastic modulus of spinal implants differs significantly from that of bone, affecting bone ingrowth performance.

[0005] This application provides a fusion device, including:

[0006] A frame includes a first end and a second end opposite to each other. A cavity is provided inside the frame, and the cavity extends through the frame in a direction from the first end to the second end. The frame has at least one opening communicating with the cavity. The frame includes an outer peripheral surface, and the opening extends from the cavity to the outer peripheral surface.

[0007] A porous structure includes a first porous portion and a second porous portion that are interconnected. The first porous portion is housed in the cavity and connected to the frame, and the second porous portion is housed in the opening and connected to the inner circumferential surface of the opening.

[0008] In the direction from the first end to the second end, the porosity of the first porous portion decreases first and then increases, and the porosity of the second porous portion decreases first and then increases; the first porous portion includes a bone graft window extending in the direction from the first end to the second end, and in the direction from the bone graft window to the frame, the porosity of the first porous portion gradually decreases.

[0009] This application also provides a spinal implant, including:

[0010] A frame includes a first end and a second end opposite to each other, and a cavity is provided inside the frame, the cavity penetrating the frame along the direction from the first end to the second end;

[0011] A porous structure includes a first porous portion, which is housed within the cavity and connected to the frame. The first porous portion includes a first part, a second part, and a third part distributed sequentially from the first end to the second end. The porosity of the first part and the third part is greater than that of the second part.

[0012] In some embodiments, the porosity of the first portion gradually decreases along the direction from the first end to the second end; the minimum porosity of the first portion is greater than or equal to the maximum porosity of the second portion; and / or,

[0013] The porosity of the second part gradually increases along the direction from the first end to the second end, and the minimum porosity of the second part is greater than or equal to the maximum porosity of the third part.

[0014] In some embodiments, the porosity of the first portion is substantially constant in the direction from the first end to the second end; and / or,

[0015] In the direction from the first end to the second end, the porosity of the second portion is substantially constant; and / or,

[0016] The porosity of the third portion is substantially constant in the direction from the first end to the second end.

[0017] In some embodiments, the first portion extends from the first end to the second portion; and / or, the third portion extends from the second end to the second portion.

[0018] In some embodiments, the porosity of the second portion first decreases and then increases along the direction from the first end to the second end.

[0019] In some embodiments, the minimum porosity of the second portion is located at the middle of the spinal implant in the direction from the first end to the second end.

[0020] In some embodiments, in the direction from the first end to the second end, the difference between the maximum porosity and the minimum porosity of the first porous portion is greater than or equal to 60%.

[0021] In some embodiments, in the direction from the first end to the second end, the maximum porosity of the first porous portion is greater than or equal to 60% and less than or equal to 90%; and / or,

[0022] In the direction from the first end to the second end, the minimum porosity of the first porous portion is greater than or equal to 30% and less than or equal to 60%.

[0023] In some embodiments, in the direction from the first end to the second end, the porosity of the first porous portion increases or decreases by more than or equal to 10% and less than or equal to 25% per 1 mm.

[0024] In some embodiments, the first porous portion includes a bone graft window extending in a direction from the first end to the second end. The first porous portion includes a first end face and a second end face, the first end face and the second end face being distributed sequentially in a direction from the first end to the second end, and the first end face and / or the second end face forming a bone graft opening communicating with the bone graft window.

[0025] The first porous portion includes a first sub-porous portion and a second sub-porous portion distributed sequentially along the direction from the bone graft window to the frame, wherein the porosity of the first sub-porous portion is greater than the porosity of the second sub-porous portion.

[0026] In some embodiments, the porosity of the first sub-porous portion gradually decreases in the direction from the bone graft window to the frame; and / or,

[0027] In the direction from the bone graft window to the frame, the porosity of the second sub-porous portion gradually decreases.

[0028] In some embodiments, the porosity of the first sub-porous portion is substantially constant in the direction from the bone graft window to the frame; and / or,

[0029] In the direction from the bone graft window to the frame, the porosity of the second sub-porous portion is substantially constant.

[0030] In some embodiments, in the direction from the bone graft window to the frame, the difference between the maximum porosity and the minimum porosity of the first porous portion is greater than or equal to 60%.

[0031] In some embodiments, in the direction from the bone graft window to the frame, the maximum porosity of the first porous portion is greater than or equal to 60% and less than or equal to 90%; and / or,

[0032] In the direction from the bone graft window to the frame, the minimum porosity of the first porous portion is greater than or equal to 30% and less than or equal to 60%.

[0033] In some embodiments, in the direction from the bone graft window to the frame, the porosity of the first porous portion increases or decreases by more than or equal to 6% and less than or equal to 12% per 1 mm.

[0034] In some embodiments, the first porous portion includes a first end face and a second end face, the first end face and the second end face being distributed sequentially along the direction from the first end to the second end; the first end face and / or the second end face are provided with anti-slip protrusions, the anti-slip protrusions including a contact surface for contacting the spine, the contact surface being a convex curved surface.

[0035] In some embodiments, the first porous portion includes a bone graft window extending in a direction from the first end to the second end. The first porous portion includes a first end face and a second end face, which are sequentially distributed in a direction from the first end to the second end. The first end face and / or the second end face are formed with a bone graft opening communicating with the bone graft window. The spinal implant also includes at least one first reinforcing portion extending circumferentially along the bone graft window and spaced apart from the frame.

[0036] In some embodiments, at least one of the bone graft sites is provided with the first reinforcing portion.

[0037] In some embodiments, the outer periphery of the frame is provided with at least one opening communicating with the cavity, the frame includes an outer peripheral surface, and the opening extends from the cavity to the outer peripheral surface;

[0038] The porous structure further includes a second porous portion connected to the first porous portion. The second porous portion is housed within at least one of the openings and connected to the inner circumferential surface of the opening. In the direction from the first end to the second end, the pore size of the second porous portion first decreases and then increases.

[0039] In some embodiments, the spinal implant further includes a second reinforcing portion, a portion of which is located within the opening and spaced apart from the inner peripheral surface. The second reinforcing portion has a through hole for an instrument to pass through, and a second porous portion within the opening is connected between the second reinforcing portion and the inner peripheral surface.

[0040] In some embodiments, the spinal implant further includes a third reinforcing portion disposed within at least one of the openings, the third reinforcing portion being connected to the inner peripheral surfaces of at least two sides of the opening, and a second porous portion within the opening being connected between the third reinforcing portion and the inner peripheral surfaces.

[0041] In some embodiments, the third reinforcing portion and the second reinforcing portion are distributed on both sides of the cavity.

[0042] In some embodiments, the number of openings is multiple, and the multiple openings are spaced apart along the circumference of the frame; each opening is provided with the second porous portion.

[0043] In some embodiments, the wire diameter of the first porous portion is greater than or equal to 200 μm and less than or equal to 600 μm; and / or,

[0044] The diameter of the inscribed circle of the hole in the first porous section is greater than or equal to 300 micrometers and less than or equal to 1200 μm.

[0045] In some embodiments, the spinal implant includes an interbody fusion device or an artificial vertebral body.

[0046] The spinal implant provided in this application embodiment allows the first porous portion of the porous structure to be housed within the cavity of the frame. When the spinal implant is implanted into the spine, the portion of the first porous portion of the porous structure near the first end and / or the second end of the frame can contact the bone tissue of the spine, allowing the bone tissue of the spine to grow and fuse together with the portion of the first porous portion near the first end and / or the second end.

[0047] Furthermore, in the direction from the first end to the second end of the frame, the first, second, and third portions of the first porous portion are distributed sequentially, and the porosity of the first and third portions is greater than that of the second portion. This allows the porosity of the first porous portion to be set in a gradient in the direction from the first end to the second end, which helps to reduce the elastic modulus of the portion of the first porous portion near the first and second ends of the frame. This makes the elastic modulus of the two ends of the spinal implant along the first direction close to that of the bone, thereby reducing stress shielding and improving bone ingrowth performance. At the same time, it also improves the structural strength of the spinal implant in the central region near the first direction, reducing the risk of fracture in the middle of the spinal implant after compression at both ends in the direction from the first end to the second end. Attached Figure Description

[0048] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0049] Figure 1 A schematic diagram of the structure of the first embodiment of the spinal implant provided in this application;

[0050] Figure 2 A schematic diagram of the structure of a second embodiment of the spinal implant provided in this application;

[0051] Figure 3 A schematic diagram of one embodiment of the Thiessen polygon structure provided in this application;

[0052] Figure 4 A schematic diagram of the structure of a third embodiment of the spinal implant provided in this application;

[0053] Figure 5This is a schematic diagram of the structure of the first embodiment of the anti-detachment protrusion provided in this application.

[0054] Figure 6 A schematic diagram of the structure of a second embodiment of the anti-detachment protrusion provided in this application;

[0055] Figure 7 A schematic diagram of the structure of a third embodiment of the anti-detachment protrusion provided in this application;

[0056] Figure 8 This is a schematic diagram of the structure of the fourth embodiment of the anti-detachment protrusion provided in this application.

[0057] Figure 9 A schematic diagram of the structure of one embodiment of the frame and the first reinforcing part provided in this application;

[0058] Figure 10 A schematic diagram of the structure of one embodiment of the frame and the second reinforcing part provided in this application;

[0059] Figure 11 A schematic diagram of the structure of one embodiment of the frame and the third reinforcing part provided in this application;

[0060] Figure 12 A schematic diagram of the structure of the fourth embodiment of the spinal implant provided in this application;

[0061] Figure 13 A schematic diagram of the fifth embodiment of the spinal implant provided in this application;

[0062] Figure 14 A schematic diagram of the sixth embodiment of the spinal implant provided in this application;

[0063] Figure 15 This is a structural schematic diagram of the seventh embodiment of the spinal implant provided in this application.

[0064] Spinal implant 10; frame 11; cavity 110; first end 111; second end 112; outer peripheral surface 113; opening 114; inner peripheral surface 115; first reinforcing part 116; second reinforcing part 117; through hole 1171; third reinforcing part 118; porous structure 12; wire diameter 120; first porous part 121; first section 1211; second section 1212; third section 1213; bone graft window 1214; bone graft opening 1215; first sub-porous part 1216; second sub-porous part 1217; first end face 1218; second end face 1219; anti-dislodgement protrusion 122; contact surface 1221; protrusion 1222; second porous part 123; direction X from first end to second end; direction Y from bone graft window to frame. Detailed Implementation

[0065] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0066] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0068] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0069] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0070] Spinal implants such as fusion devices and artificial vertebrae are commonly used medical devices in spinal surgery. They are primarily implanted into the human spine to allow the spine and implant to fuse and achieve spinal restoration. To promote fusion between the spine and the implant, the implant needs to provide a favorable biomechanical environment, minimizing stress shielding and ensuring sufficient mechanical stimulation to the spinal bone tissue. This promotes bone ingrowth and allows for faster fusion between the spine and implant.

[0071] However, the elastic modulus of spinal implants differs significantly from that of bone. Spinal implants are harder than the spine itself. When implanted, they can create stress shielding, keeping the spinal bone tissue at a low stress level for extended periods, thus weakening bone ingrowth. In the later stages of orthopedic surgery recovery, the spinal bone tissue may experience osteoporosis due to insufficient mechanical stimulation.

[0072] To avoid the above problems, embodiments of this application provide a fusion device and a spinal implant. These will be described in detail below.

[0073] First, this application provides a spinal implant.

[0074] Figure 1 This is a schematic diagram of the structure of one embodiment of the spinal implant provided in this application. Figure 1As shown, the spinal implant 10 includes a frame 11 and a porous structure 12. The frame 11 includes a first end 111 and a second end 112, and a cavity 110 is provided inside the frame 11. The cavity 110 extends through the frame 11 in a direction X from the first end 111 to the second end 112. The porous structure 12 has multiple pores, and at least a portion of the porous structure 12 is housed within the cavity 110 of the frame 11 and connected to the frame 11. When the spinal implant 10 is implanted into the spine, one side of the porous structure 12 along the direction from the first end 111 to the second end 112, and / or the other side of the porous structure 12 along the direction from the second end 112 to the first end 111, can contact the spine. The multiple pores of the porous structure 12 can promote the growth of spinal bone tissue, allowing the spinal bone tissue to grow more quickly into the multiple pores of the porous structure 12, thereby enabling the spinal bone tissue to rapidly grow and fuse with the porous structure 12 of the spinal implant 10.

[0075] It should be noted that the spinal implant 10 can be an interbody fusion device. Specifically, the spinal implant 10 can be a lumbar interbody fusion device (such as...). Figure 12 As shown), oblique lateral lumbar interbody fusion cage (such as...) Figure 13 As shown), self-stabilizing fusion type (such as Figure 14 As shown in the diagram, lumbar interbody fusion devices are primarily used for posterior lumbar interbody fusion (PLIF). Oblique lumbar interbody fusion devices are primarily used for oblique lumbar interbody fusion (OLIF). The spinal implant 10 can be formed using 3D printing or other methods. However, 3D printing is more convenient and produces better mechanical results.

[0076] Or, such as Figure 15 As shown, the spinal implant 10 can also be an artificial vertebral body used to replace the vertebrae of the spine.

[0077] Alternatively, the spinal implant 10 can be implanted into a vertebra of the spine, in which case the vertebra grows and fuses with the porous structure 12 of the spinal implant 10 during the implantation period. Or, the spinal implant 10 can be implanted between two vertebrae of the spine, or implanted on one side of a vertebra of the spine, in which case the vertebra grows and fuses with the porous structure 12 of the adjacent spinal implant 10.

[0078] Understandably, if the spinal implant 10 is implanted into a vertebra, or between two adjacent vertebrae, then one side of the spine along the direction from the first end 111 to the second end 112, and the other side along the direction from the second end 112 to the first end 111, can contact and grow fused together with the spine. If the spinal implant 10 is implanted into only one side of a vertebra, that vertebra grows fused together with the porous structure 12 of the pole implant.

[0079] In some embodiments, such as Figure 1 As shown, the porous structure 12 may include a first porous portion 121, which is housed within the cavity 110 and connected to the frame 11. When the spinal implant 10 is implanted into the spine, the first porous portion 121 can contact the spine on one side along the direction from the first end 111 to the second end 112, and / or the porous structure 12 can contact the spine on one side along the direction from the second end 112 to the first end 111. The bone tissue of the spine can grow more quickly into the multiple holes of the first porous portion 121 near the first end 111 and / or the second end 112, thereby allowing the bone tissue of the spine to grow and fuse rapidly with the first porous portion 121 of the spinal implant 10.

[0080] The first porous portion 121 may include a first portion 1211, a second portion 1212 and a third portion 1213 distributed sequentially from the first end 111 to the second end 112, wherein the porosity of the first portion 1211 and the third portion 1213 is greater than that of the second portion 1212.

[0081] The spinal implant 10 provided in this application embodiment allows the first porous portion 121 of the porous structure 12 to be housed within the cavity 110 of the frame 11. When the spinal implant 10 is implanted into the spine, the portion of the first porous portion 121 of the porous structure 12 near the first end 111 and / or the second end 112 of the frame 11 can contact the bone tissue of the spine, allowing the bone tissue of the spine to grow and fuse together with the portion of the first porous portion 121 near the first end 111 and / or the second end 112.

[0082] Furthermore, along the X-direction from the first end 111 to the second end 112 of the frame 11, the first portion 1211, the second portion 1212, and the third portion 1213 of the first porous portion 121 are sequentially distributed, and the porosity of the first portion 1211 and the third portion 1213 is greater than that of the second portion 1212. This allows the porosity of the first porous portion 121 to be set in a gradient along the X-direction from the first end 111 to the second end 112, which helps to reduce the elastic modulus of the portion of the first porous portion 121 near the first end 111 and the second end 112 of the frame 11. This makes the elastic modulus of the two ends of the spinal implant 10 along the first direction close to that of the bone, thereby reducing stress shielding and improving bone ingrowth performance. At the same time, it also improves the structural strength of the spinal implant 10 near the middle region in the first direction, reducing the risk of fracture in the middle of the spinal implant 10 when the two ends are compressed along the X-direction from the first end 111 to the second end 112.

[0083] It should be noted that the average porosity of the first part 1211 and the third part 1213 can be greater than the average porosity of the second part 1212, or the minimum porosity of the first part 1211 and the third part 1213 can be greater than the maximum porosity of the second part 1212. It is only necessary to make the elastic modulus of the first part 1211 and the third part 1213 less than the elastic modulus of the second part 1212.

[0084] Furthermore, the first part 1211, the second part 1212, and the third part 1213 can be continuous or discontinuous, with other porous structures 12 in between. In the direction X from the first end 111 to the second end 112, the sum of the lengths of the first part 1211, the second part 1212, and the third part 1213 can be equal to or less than the total length of the first porous portion 121.

[0085] In some embodiments, the porosity of the first portion 1211 may gradually decrease along the direction X from the first end 111 to the second end 112. The minimum porosity of the first portion 1211 is greater than or equal to the maximum porosity of the second portion 1212, thereby making the porosity of the first portion 1211 greater than the porosity of the second portion 1212. Furthermore, the porosity of the first portion 1211 can be set in a gradient along the X direction from the first end 111 to the second end 112, which is beneficial for flexibly adjusting the elastic modulus of the first portion 1211. This makes the elastic modulus of the first porous portion 121 smaller closer to the first end 111, thereby further improving the ability of the spinal implant 10 to better meet the mechanical environment at the first end 111. This minimizes the stress shielding of the spinal implant 10 at the first end 111, allowing the bone tissue of the spine in contact with the side of the first porous portion 121 near the first end 111 to receive sufficient mechanical stimulation. This promotes the bone ingrowth performance of the bone tissue of the spine in contact with the side of the first porous portion 121 near the first end 111, enabling the spine to grow and fuse more quickly with the side of the spinal implant 10 near the first end 111.

[0086] In other embodiments, the porosity of the first portion 1211 of the first porous portion 121 can be kept substantially constant in the X direction from the first end 111 to the second end 112. This can also reduce the elastic modulus of the portion of the first porous portion 121 near the first end 111 to a certain extent, simply by ensuring that the porosity of the first portion 1211 is greater than that of the second portion 1212. Moreover, when the porosity of the first portion 1211 of the first porous portion 121 is substantially constant in the X direction from the first end 111 to the second end 112, the processing of the first porous portion 121 becomes more convenient, which is beneficial to improving the production efficiency of the spinal implant 10.

[0087] Similarly, the porosity of the third part 1213 can be gradually increased along the direction X from the first end 111 to the second end 112. The minimum porosity of the second part 1212 is greater than or equal to the maximum porosity of the third part 1213, thereby making the porosity of the third part 1213 greater than that of the second part 1212. Furthermore, the porosity of the third part 1213 can be set in a gradient, which is beneficial for flexibly adjusting the elastic modulus of the third part 1213. This makes the elastic modulus of the first porous part 121 smaller as it gets closer to the second end 112, which is beneficial for further improving the mechanical environment of the spinal implant 10 at the second end 112. This reduces the stress shielding of the spinal implant 10 at the second end 112 as much as possible, and allows the bone tissue of the spine in contact with the side of the first porous part 121 near the second end 112 to receive sufficient mechanical stimulation. This promotes the bone ingrowth performance of the bone tissue of the spine in contact with the side of the first porous part 121 near the second end 112, and allows the spine to grow and fuse with the side of the spinal implant 10 near the second end 112 more quickly.

[0088] In other embodiments, the porosity of the third portion 1213 can be kept substantially constant in the X direction from the first end 111 to the second end 112. This can also reduce the elastic modulus of the portion of the first porous portion 121 near the second end 112 to a certain extent, simply by ensuring that the porosity of the third portion 1213 is greater than that of the second portion 1212. Moreover, when the porosity of the third portion 1213 of the first porous portion 121 is substantially constant in the X direction from the first end 111 to the second end 112, the processing of the first porous portion 121 becomes more convenient, which is beneficial to improving the production efficiency of the spinal implant 10.

[0089] It should be noted that the porosity of the first portion 1211 can be gradually decreased or kept substantially constant along the direction X from the first end 111 to the second end 112, or the porosity of the second portion 1212 can be gradually increased or kept substantially constant along the direction X from the first end 111 to the second end 112. Alternatively, the porosity of the first portion 1211 can be gradually decreased along the direction X from the first end 111 to the second end 112 while the porosity of the second portion 1212 can be gradually increased or kept substantially constant along the same direction X. Or, the porosity of the first portion 1211 can be kept substantially constant along the direction X from the first end 111 to the second end 112 while the porosity of the second portion 1212 can be gradually increased or kept substantially constant along the same direction X.

[0090] In some embodiments, the porosity of the second portion 1212 can be made to decrease first and then increase along the direction X from the first end 111 to the second end 112, so that the porosity of the second portion 1212 is set in a gradient. This is beneficial for flexibly adjusting the elastic modulus of the second portion 1212, so that the porosity of the first porous portion 121 in the middle part of the frame 11 in the direction from the first end 111 to the second end 112 is as small as possible and the elastic modulus is as high as possible. This is beneficial for improving the strength of the first porous portion 121 in the middle part of the frame 11 in the direction from the first end 111 to the second end 112, and reducing the risk of the middle part of the spinal implant 10 breaking after both ends of the spinal implant 10 are compressed in the direction from the first end 111 to the second end 112.

[0091] In the direction X from the first end 111 to the second end 112, the minimum porosity of the second portion 1212 can be located at the middle of the spinal implant 10. This allows the first porous portion 121 to have a higher elastic modulus at the middle of the frame 11 in the direction from the first end 111 to the second end 112, which helps to improve the strength of the spinal implant 10 at the middle of the direction from the first end 111 to the second end 112, thereby further reducing the risk of fracture at the middle of the spinal implant 10.

[0092] In other embodiments, the porosity of the second portion 1212 can be kept substantially constant in the X direction from the first end 111 to the second end 112. This also allows the elastic modulus of the first porous portion 121 in the middle of the frame 11 in the X direction from the first end 111 to the second end 112 to be higher, thereby reducing the risk of fracture in the middle of the spinal implant 10. Moreover, when the porosity of the second portion 1212 of the first porous portion 121 is kept substantially constant in the X direction from the first end 111 to the second end 112, the processing of the first porous portion 121 becomes more convenient, which is beneficial to improving the production efficiency of the spinal implant 10.

[0093] In some embodiments, the first portion 1211 of the first porous portion 121 can extend from the first end 111 of the frame 11 to the second portion 1212. This allows the first portion 1211 to be closer to the first end 111 of the frame 11, and by adjusting the porosity of the first portion 1211, the elastic modulus of the portion of the first porous portion 121 near the first end 111 can be adjusted. In particular, when the porosity of the first portion 1211 gradually decreases along the direction X from the first end 111 to the second end 112, the elastic modulus of the portion of the first porous portion 121 near the first end 111 can be made smaller.

[0094] Similarly, the third portion 1213 of the first porous portion 121 can be extended from the second end 112 to the second portion 1212. This allows the third portion 1213 to be closer to the second end 112 of the frame 11, and by adjusting the porosity of the third portion 1213, the elastic modulus of the portion of the first porous portion 121 near the second end 112 can be adjusted. In particular, when the porosity of the second portion 1212 gradually increases along the direction X from the first end 111 to the second end 112, the elastic modulus of the portion of the first porous portion 121 near the second end 112 can be made smaller.

[0095] In some embodiments, in the direction X from the first end 111 to the second end 112, the difference between the maximum porosity and the minimum porosity of the first porous portion 121 can be greater than or equal to 60%. This allows the porosity of the first porous portion 121 in the direction X from the first end 111 to the second end 112 to have a large adjustment range, so that the first porous portion 121 can form a porous structure 12 with lower porosity in areas of the spinal implant 10 where strength requirements are high, and a porous structure 12 with higher porosity in areas of the spinal implant 10 where strength requirements are low.

[0096] The difference between the maximum and minimum porosity of the first porous portion 121 in the direction X from the first end 111 to the second end 112 can be 65%, 70%, 75%, etc., depending on the structure of the first porous portion 121 and the strength requirements of each part of the spinal implant 10.

[0097] In some embodiments, in the direction X from the first end 111 to the second end 112, the maximum porosity of the first porous portion 121 can be greater than or equal to 60% and less than or equal to 90%. This allows the first porous portion 121 to have a smaller elastic modulus and lower strength at the maximum porosity in the direction X from the first end 111 to the second end 112.

[0098] The maximum porosity of the first porous portion 121 in the direction X from the first end 111 to the second end 112 can be 65%, 70%, 75%, etc., depending on the structure of the first porous portion 121 and the strength requirements of each part of the spinal implant 10.

[0099] Specifically, the maximum porosity of the first portion 1211 and / or the third portion 1213 of the first porous portion 121 in the direction X from the first end 111 to the second end 112 can be greater than or equal to 60% and less than or equal to 90%, so that the first portion 1211 and / or the third portion 1213 have a smaller elastic modulus, which facilitates the reduction of the strength of the spinal implant 10 at the first portion 1211 and the third portion 1213, and helps to reduce the stress shielding of the spinal implant 10 at the first end 111 and / or the second end 112.

[0100] Furthermore, in the direction X from the first end 111 to the second end 112, the minimum porosity of the first porous portion 121 is greater than or equal to 30% and less than or equal to 60%. This allows the first porous portion 121 to have a larger elastic modulus and higher strength at the minimum porosity in the direction X from the first end 111 to the second end 112, which helps reduce the risk of the spinal implant 10 breaking in the middle when both ends are compressed in the direction from the first end 111 to the second end 112.

[0101] The difference between the maximum and minimum porosity of the first porous portion 121 in the direction from the first end 111 to the second end 112 can be 35%, 40%, 45%, etc., depending on the structure of the first porous portion 121 and the strength requirements of each part of the spinal implant 10.

[0102] Specifically, the maximum porosity of the second part 1212 of the first porous portion 121 can be greater than or equal to 30% and less than or equal to 60%, so that the second part 1212 has a larger elastic modulus, which is conducive to improving the strength of the spinal implant 10 at the second part 1212 and reducing the risk of fracture in the middle of the spinal implant 10.

[0103] In some embodiments, in the direction X from the first end 111 to the second end 112, the porosity of the first porous portion 121 can be increased or decreased by more than or equal to 10% and less than or equal to 25% per 1 mm. This allows the spinal implant 10 to have a lower elastic modulus at the first end 111 and / or the second end 112, reducing stress shielding at these locations, while also allowing the central portion of the spinal implant 10 to have higher strength in the direction X from the first end 111 to the second end 112, thus reducing the risk of central fracture of the spinal implant 10.

[0104] In the direction X from the first end 111 to the second end 112, the porosity of the first porous portion 121 can be increased or decreased by 12%, 15%, 18%, 23%, etc. per 1mm, which can be determined according to the structure, material and other factors of the frame 11 and the first porous portion 121.

[0105] It should be noted that, along the direction X from the first end 111 to the second end 112, the porosity of the first porous portion 121 can be increased or decreased, depending on the location of the first porous portion 121. For example, when the porosity of the first portion 1211 gradually decreases along the direction X from the first end 111 to the second end 112, the porosity of the first portion 1211 can be gradually reduced along the direction X from the first end 111 to the second end 112 at a rate of 10% to 25% decrease per 1 mm.

[0106] When the porosity of the second part 1212 decreases first and then increases along the direction X from the first end 111 to the second end 112, the porosity of the first part 1211 can be gradually reduced at a rate of 10% to 25% per 1 mm along the direction X from the first end 111 to the second end 112, and then gradually increased at a rate of 10% to 25% per 1 mm.

[0107] When the porosity of the third part 1213 gradually increases along the direction X from the first end 111 to the second end 112, the porosity of the third part 1213 can gradually increase along the direction X from the first end 111 to the second end 112 at a rate of 10% to 25% increase per 1 mm.

[0108] Furthermore, the porosity of the first porous portion 121 increasing or decreasing by more than or equal to 10% and less than or equal to 25% per 1 mm along the X direction from the first end 111 to the second end 112 refers to the rate of change of porosity of the first porous portion 121 along the X direction from the first end 111 to the second end 112, and does not refer to the length of the first porous portion 121 along the X direction from the first end 111 to the second end 112 being greater than 1 mm.

[0109] like Figure 2 As shown, the first porous portion 121 may include a bone graft window 1214 extending in the direction X from the first end 111 to the second end 112. The first porous portion 121 includes a first end face 1218 and a second end face 1219, which are sequentially distributed in the direction X from the first end 111 to the second end 112. The first end face 1218 and / or the second end face 1219 form a bone graft opening 1215 communicating with the bone graft window 1214. Thus, during the process of implanting the spinal implant 10 into the spine, bone can be placed within the bone graft window 1214 through the bone graft opening 1215 to improve the growth and fusion speed of the spinal implant 10 with the spine.

[0110] In some embodiments, the first porous portion 121 may include a first sub-porous portion 1216 and a second sub-porous portion 1217 sequentially distributed along the direction Y from the bone graft window 1214 to the frame 11, wherein the porosity of the first sub-porous portion 1216 is greater than the porosity of the second sub-porous portion 1217.

[0111] By sequentially distributing the first sub-porous portion 1216 and the second sub-porous portion 1217 of the first porous portion 121 along the direction Y from the bone graft window 1214 to the frame 11, and by making the porosity of the first porous portion 121 greater than that of the second sub-porous portion 1217, the porosity of the first porous portion 121 can be gradient along the direction Y from the bone graft window 1214 to the frame 11. Furthermore, the portion of the first porous portion 121 closer to the frame 11 has higher strength, thereby improving the support stability of the spinal implant 10 on the spine after implantation. Additionally, the region of the first porous portion 121 closer to the bone graft window 1214 has larger gaps, which facilitates bone ingrowth into the first porous portion 121.

[0112] It should be noted that the average porosity of the first sub-porous portion 1216 can be greater than the average porosity of the second sub-porous portion 1217, and the minimum porosity of the first sub-porous portion 1216 can be greater than the maximum porosity of the second sub-porous portion 1217. It is only necessary to make the elastic modulus of the first sub-porous portion 1216 less than the elastic modulus of the second sub-porous portion 1217.

[0113] Furthermore, the first sub-porous portion 1216 and the second sub-porous portion 1217 can be continuous or discontinuous, with other porous structures 12 in between. In the Y direction from the bone graft window 1214 to the frame 11, the sum of the widths of the first sub-porous portion 1216 and the second sub-porous portion 1217 can be equal to or less than the total width of the first porous portion 121.

[0114] In some embodiments, the porosity of the first sub-porous portion 1216 can be gradually reduced in the Y direction from the bone graft window 1214 to the frame 11. This allows the first sub-porous portion 1216 to be arranged in a gradient along the Y direction from the bone graft window 1214 to the frame 11, facilitating flexible adjustment of the elastic modulus of the first sub-porous portion 1216. This results in a smaller elastic modulus and larger gaps in the portion of the first sub-porous portion 1216 closer to the bone graft window 1214, further improving the spine's ability to better meet the mechanical environment at the bone graft window 1214, and promoting bone tissue ingrowth into the gaps of the first sub-porous portion 1216.

[0115] In other embodiments, the porosity of the first sub-porous portion 1216 can be kept essentially constant in the Y direction from the bone graft window 1214 to the frame 11. This can also reduce the elastic modulus of the portion of the first porous portion 121 near the bone graft window 1214 to a certain extent, simply by ensuring that the porosity of the first sub-porous portion 1216 is greater than that of the second sub-porous portion 1217. Moreover, when the porosity of the first sub-porous portion 1216 of the first porous portion 121 is essentially constant in the Y direction from the bone graft window 1214 to the frame 11, the processing of the first porous portion 121 becomes more convenient, which is beneficial to improving the production efficiency of the spinal implant 10.

[0116] Similarly, in the Y direction from the bone graft window 1214 to the frame 11, the porosity of the second sub-porous portion 1217 can be gradually reduced. This allows the second sub-porous portion 1217 to be arranged in a gradient along the Y direction from the bone graft window 1214 to the frame 11, facilitating flexible adjustment of the elastic modulus of the second sub-porous portion 1217. This results in a larger elastic modulus and smaller gaps in the portion of the second sub-porous portion 1217 closer to the frame 11, further improving the structural strength near the frame 11 and enabling the spinal implant 10 to more stably support the spine.

[0117] In other embodiments, the porosity of the second sub-porous portion 1217 can be kept substantially constant in the Y direction from the bone graft window 1214 to the frame 11. This can also improve the elastic modulus of the portion of the first porous portion 121 near the frame 11 to a certain extent, simply by ensuring that the porosity of the first sub-porous portion 1216 is greater than that of the second sub-porous portion 1217. Moreover, when the porosity of the second sub-porous portion 1217 of the first porous portion 121 is substantially constant in the Y direction from the bone graft window 1214 to the frame 11, the processing of the second sub-porous portion 1217 becomes more convenient, which is beneficial to improving the production efficiency of the spinal implant 10.

[0118] It should be noted that the porosity of only one of the first sub-porous portion 1216 and the second sub-porous portion 1217 can be gradually reduced or kept substantially constant along the direction Y from the bone graft window 1214 to the frame 11. Alternatively, the porosity of both the first sub-porous portion 1216 and the second sub-porous portion 1217 can be gradually reduced or kept substantially constant along the direction Y from the bone graft window 1214 to the frame 11. Furthermore, the porosity of the first sub-porous portion 1216 can be gradually reduced along the direction Y from the bone graft window 1214 to the frame 11 while the porosity of the second sub-porous portion 1217 remains substantially constant along the direction Y from the bone graft window 1214 to the frame 11. Alternatively, the porosity of the first sub-porous portion 1216 can be kept substantially constant along the direction Y from the bone graft window 1214 to the frame 11 while the porosity of the second sub-porous portion 1217 gradually decreases along the direction Y from the bone graft window 1214 to the frame 11.

[0119] In some embodiments, in the direction Y from the bone graft window 1214 to the frame 11, the difference between the maximum and minimum porosity of the first porous portion 121 can be greater than or equal to 60%. This allows the porosity of the first porous portion 121 to have a large adjustment range in the direction Y from the bone graft window 1214 to the frame 11, so that the first porous portion 121 can form a porous structure 12 with lower porosity in areas of the spinal implant 10 where strength requirements are high, and a porous structure 12 with higher porosity in areas of the spinal implant 10 where strength requirements are low.

[0120] The difference between the maximum and minimum porosity of the first porous portion 121 in the direction Y from the bone graft window 1214 to the frame 11 can be 65%, 70%, 75%, etc., depending on the structure of the first porous portion 121 and the strength requirements of each part of the spinal implant 10.

[0121] In some embodiments, in the Y direction from the bone graft window 1214 to the frame 11, the maximum porosity of the first porous portion 121 is greater than or equal to 60% and less than or equal to 90%. This allows the first porous portion 121 to have a lower elastic modulus at the maximum porosity in the Y direction from the bone graft window 1214 to the frame 11, resulting in lower strength of the spinal implant 10 at the maximum porosity of the first porous portion 121, thereby enabling the spinal implant 10 to meet better mechanical requirements.

[0122] The maximum porosity of the first porous portion 121 in the direction Y from the bone graft window 1214 to the frame 11 can be 65%, 70%, 75%, etc., depending on the structure of the first porous portion 121 and the strength requirements of each part of the spinal implant 10.

[0123] Specifically, the maximum porosity of the first sub-porous portion 1216 in the direction Y from the bone graft window 1214 to the frame 11 can be greater than or equal to 60% and less than or equal to 90%, so that the first sub-porous portion 1216 has a smaller elastic modulus, which is conducive to reducing the strength of the spinal implant 10 at the first sub-porous portion 1216 and helps to reduce the stress shielding of the spinal implant 10 at the bone graft window 1214.

[0124] Furthermore, in the Y direction from the bone graft window 1214 to the frame 11, the minimum porosity of the first porous portion 121 can be greater than or equal to 30% and less than or equal to 60%. This allows the first porous portion 121 to have a larger elastic modulus and higher strength at the minimum porosity in the Y direction from the bone graft window 1214 to the frame 11, which is beneficial for improving the support stability of the spinal implant 10 on the spine.

[0125] The difference between the maximum and minimum porosity of the first porous portion 121 in the direction Y from the bone graft window 1214 to the frame 11 can be 35%, 40%, 45%, etc., depending on the structure of the first porous portion 121 and the strength requirements of each part of the spinal implant 10.

[0126] Specifically, the maximum porosity of the second sub-porous portion 1217 in the direction Y from the bone graft window 1214 to the frame 11 can be greater than or equal to 30% and less than or equal to 60%, so that the second sub-porous portion 1217 has a larger elastic modulus and strength, which is beneficial to improving the support stability of the spinal implant 10 on the spine.

[0127] In some embodiments, in the Y direction from the bone graft window 1214 to the frame 11, the porosity of the first porous portion 121 can be reduced by more than or equal to 6% and less than or equal to 12% per 1 mm. This allows the spinal implant 10 to have a lower elastic modulus near the bone graft window 1214, reducing stress shielding at the bone graft window 1214, while also allowing the spinal implant 10 to have higher strength near the frame 11, reducing the risk of mid-section fracture.

[0128] In the direction Y from the bone graft window 1214 to the frame 11, the porosity of the first porous part 121 can decrease by 7%, 9%, 10%, 11%, etc. per 1mm, which can be determined according to the structure, material and other factors of the frame 11 and the first porous part 121.

[0129] It should be noted that the porosity of the first porous portion 121 decreasing by more than or equal to 10% and less than or equal to 25% per 1 mm in the direction Y from the bone graft window 1214 to the frame 11 refers to the rate of change of porosity of the first porous portion 121 in the direction Y from the bone graft window 1214 to the frame 11, and does not mean that the width of the first porous portion 121 in the direction Y from the bone graft window 1214 to the frame 11 is greater than 1 mm.

[0130] In some embodiments, such as Figure 3 As shown, the porous structure 12 includes multiple filaments 120, which are interconnected and enclose each other to form multiple voids. The porous structure 12 can be a Thiessen polygonal structure or other structures; no limitation is made here.

[0131] In some embodiments, the width of the wire diameter 120 of the first porous portion 121 can be greater than or equal to 200 μm and less than or equal to 600 μm. The inscribed circle diameter of the holes in the first porous portion 121 is greater than or equal to 300 μm and less than or equal to 1200 μm. Therefore, the maximum porosity of the first porous portion 121 can be greater than or equal to 60% and less than or equal to 90%, and the minimum porosity of the first porous portion 121 can be greater than or equal to 30% and less than or equal to 60%.

[0132] like Figure 4 , Figure 5 As shown, the first porous portion 121 includes a first end face 1218 and a second end face 1219, which are sequentially distributed along the direction X from the first end 111 to the second end 112 of the frame 11. An anti-slip protrusion 122 is provided on the first end face 1218 and / or the second end face 1219. The anti-slip protrusion 122 includes a contact surface 1221 for contacting the spine, and the contact surface 1221 is a convex curved surface.

[0133] Therefore, when the spinal implant 10 is implanted into the spine, the anti-dislodgement protrusions 122 on the first end face 1218 and / or the second end face 1219 of the first porous portion 121 will come into contact with the corresponding spine, thereby increasing the friction between the first end face 1218 and / or the second end face 1219 of the first porous portion 121 and the corresponding spine, reducing the risk of the spinal implant 10 dislodging from the spine. Moreover, since the contact surface 1221 of the anti-dislodgement protrusion 122 for contacting the spine is a convex curved surface, the anti-dislodgement protrusion 122 is less likely to cause damage to the spine when it comes into contact with the spine.

[0134] It should be noted that anti-dislodgement protrusions 122 can be provided on both the first end face 1218 and the second end face 1219 of the first porous portion 121, or anti-dislodgement protrusions 122 can be provided only on the first end face 1218 or the second end face 1219 of the first porous portion 121. Of course, the former allows both the first end face 1218 and the second end face 1219 of the first porous portion 121 to contact the corresponding spine through the anti-dislodgement protrusions 122, which can further reduce the risk of the spinal implant 10 dislodging from the spine.

[0135] In some embodiments, the height of the anti-dislodgement protrusion 122 in the direction from the first end 111 to the second end 112 can be greater than or equal to 0.3 mm and less than or equal to 1 mm. This allows the anti-dislodgement protrusion 122 to generate a large frictional force with the spine after contact, thereby limiting the dislodgement of the spinal implant 10 while preventing the anti-dislodgement protrusion 122 from being too high and causing damage to the spine.

[0136] The height of the anti-detachment protrusion 122 in the direction from the first end 111 to the second end 112 can be 0.4mm, 0.5mm, 0.7mm, etc., and can be determined according to factors such as the structure, quantity, and setting position of the anti-detachment protrusion 122.

[0137] In some embodiments, the first end face 1218 and / or the second end face 1219 may be provided with a plurality of anti-dislodgement protrusions 122 to further improve the anti-dislodgement effect on the spinal implant 10.

[0138] Specifically, the multiple anti-dislodgement protrusions 122 on the first end face 1218 are distributed at intervals along the circumference of the frame 11 to form multiple anti-dislodgement protrusion groups 122. Each anti-dislodgement protrusion group 122 includes multiple anti-dislodgement protrusions 122 distributed at intervals along the Y direction from the bone graft window 1214 to the frame 11. Similarly, the multiple anti-dislodgement protrusions 122 on the second end face 1219 are distributed at intervals along the circumference of the frame 11 to form multiple anti-dislodgement protrusion groups 122. Each anti-dislodgement protrusion group 122 includes multiple anti-dislodgement protrusions 122 distributed at intervals along the Y direction from the bone graft window 1214 to the frame 11. The number of anti-dislodgement protrusions 122 included in each anti-dislodgement protrusion group 122 is greater than or equal to 5 and less than or equal to 15.

[0139] In some embodiments, the contact surface 1221 of the anti-detachment protrusion 122 can be a portion of a sphere (e.g., Figure 5 As shown), a part of the ellipsoid (such as...) Figure 6 (as shown), or, as Figure 7 As shown, the anti-detachment protrusion 122 is shaped like a frustum, and the surface of the frustum is a convex curved surface.

[0140] In some embodiments, such as Figure 8As shown, multiple protrusions 1222 can be provided on the contact surface 1221 of the anti-slip protrusion 122, with the multiple protrusions 1222 spaced apart. This further increases the friction between the anti-slip protrusion 122 and the spine. Moreover, the gaps between the multiple protrusions 1222 facilitate the ingrowth of spinal bone tissue, thereby enabling the spine and the anti-slip protrusion 122 to grow and fuse together rapidly.

[0141] The multiple protrusions 1222 can be evenly distributed on the contact surface 1221 of the anti-detachment protrusions 122, or they can be non-uniformly distributed on the contact surface 1221 of the anti-detachment protrusions 122.

[0142] In some embodiments, the height of the plurality of protrusions 1222 protruding from the contact surface 1221 can be greater than or equal to 10 μm and less than or equal to 30 μm, thereby further increasing the friction between the plurality of protrusions 1222 and the spine. The height of the protrusions 1222 protruding from the contact surface 1221 can be 15 μm, 20 μm, 25 μm, etc., and is not limited here.

[0143] In some embodiments, the circumcircle diameter of the radial section of the protrusion 1222 can be greater than or equal to 100 μm and less than or equal to 300 μm, thereby increasing the frictional force between the multiple protrusions 1222 and the spine. Simultaneously, it can also induce the growth of spinal bone tissue, promoting faster growth and fusion of spinal bone tissue with the anti-dislocation protrusion 122.

[0144] The diameter of the circumscribed circle of the radial cross-section of the protrusion 1222 can be 120μm, 140μm, 150μm, 170μm, etc., and is not limited here. The shape of the radial cross-section of the protrusion 1222 can be hexagonal, semi-circular, square, etc. The protrusion 1222 can be a columnar structure, conical structure, hemispherical structure, etc., and is not limited here.

[0145] In some embodiments, such as Figure 9 As shown, the spinal implant 10 may further include at least one first reinforcing portion 116, which extends circumferentially along the bone graft window 1214 and is spaced apart from the frame 11. Thus, the shape of the bone graft window 1214 can be made more stable by the first reinforcing portion 116, facilitating the placement of bone within the bone graft window 1214.

[0146] A first reinforcing part 116 may be provided at at least one bone graft opening 1215 to stabilize the shape of the at least one bone graft opening 1215, so as to facilitate the placement of bone through the bone graft opening 1215 into the bone graft window 1214.

[0147] Specifically, the first reinforcing portion 116 is arranged in a ring shape. A bone graft opening 1214 is formed on the first end face 1218 of the first porous portion 121, with a bone graft port 1215. The first reinforcing portion 116 is provided at this bone graft port 1215 to stabilize its shape. The bone graft opening 1214 extends through the first porous portion 121 in a direction X from the first end 111 to the second end 112. A bone graft port 1215 is also formed on the second end face 1219 of the first porous portion 1214, with the first reinforcing portion 116 provided at this bone graft port 1215 to stabilize its shape.

[0148] In other embodiments, the first reinforcing part 116 can maintain a certain distance from the bone graft opening 1215 of the bone graft window 1214, which can also stabilize the shape of the bone graft window 1214 and the bone graft opening 1215 to a certain extent.

[0149] like Figure 1 As shown, at least one opening 114 communicating with the cavity 110 is provided on the outer periphery of the frame 11. The frame 11 includes an outer peripheral surface 113, and the opening 114 extends from the cavity 110 to the outer peripheral surface 113. In some embodiments, the porous structure 12 may further include a second porous portion 123 connected to the first porous portion 121. The second porous portion 123 is accommodated within at least one opening 114 and connected to the inner peripheral surface 115 of the opening 114. In the direction X from the first end 111 to the second end 112, the pore size of the second porous portion 123 first decreases and then increases.

[0150] By opening an opening 114 on the outer periphery of the frame 11 that communicates with the cavity 110, and providing a second porous portion 123 connected to the first porous portion 121 within the opening 114, the porosity of the second porous portion 123 first decreases and then increases in the X direction from the first end 111 to the second end 112. This allows for adjustment of the elastic modulus of the frame 11, resulting in relatively higher strength in the middle of the frame 11 in the X direction from the first end 111 to the second end 112. Consequently, the spinal implant 10 exhibits higher strength in the middle of this direction, making it less prone to breakage. Conversely, the frame 11 has relatively lower strength near the first end 111 and the second end 112, which helps reduce stress shielding of the spinal implant 10 at these locations.

[0151] In some embodiments, such as Figure 10As shown, the spinal implant 10 may further include a second reinforcing portion 117, a part of which is located within the opening 114 and spaced apart from the inner peripheral surface 115. The second reinforcing portion 117 has a through hole 1171 for an instrument to pass through. A second porous portion 123 within the opening 114 connects the second reinforcing portion 117 and the inner peripheral surface 115. By providing a second reinforcing portion 117 with a through hole 1171 within the opening 114, the shape of the through hole 1171 can be kept stable. After the instrument passes through the through hole 1171 of the second reinforcing portion 117, it can be stably connected to the spinal implant 10, facilitating the doctor's insertion of the spinal implant 10 into the spine using instruments.

[0152] The second reinforcing part 117 can be connected to the inner peripheral surface 115 of the opening 114 through the second porous part 123 in the opening 114, thereby keeping the position of the second reinforcing part 117 relative to the frame 11 stable.

[0153] In some embodiments, such as Figure 11 As shown, the spinal implant 10 may further include a third reinforcing portion 118 disposed within at least one opening 114. This third reinforcing portion 118 is connected to the inner peripheral surfaces 115 on at least two sides of the opening 114, and a second porous portion 123 within the opening 114 is connected between the third reinforcing portion 118 and the inner peripheral surfaces 115. Thus, the structural strength of the frame 11 near the opening 114 can be improved by the third reinforcing portion 118. Furthermore, by adjusting the shape and size of the third reinforcing portion 118, the structural strength of the frame 11 near the opening 114 can be adjusted, making it easier to adjust the elastic modulus of the frame 11.

[0154] It should be noted that the opening 114 can be circular, rectangular, elliptical, etc. The third reinforcing part 118 can be connected to the inner circumferential surfaces 115 on both sides of the opening 114 along the direction from the first end 111 to the second end 112, or it can be connected to the inner circumferential surfaces 115 on both sides of the opening 114 along the direction perpendicular to the direction from the first end 111 to the second end 112.

[0155] In some embodiments, the third reinforcing part 118 and the second reinforcing part 117 can be distributed on both sides of the cavity 110 to improve the structural stability of the frame 11, so that the frame 11 is less likely to deform during the process of the doctor inserting the instrument into the through hole 1171 of the second reinforcing part 117 to operate the spinal implant 10 into the spine.

[0156] In some embodiments, the number of openings 114 can be multiple, and the multiple openings 114 are arranged at intervals along the circumference of the frame 11. Each opening 114 is provided with a second porous portion 123. As a result, the adjustment of the elastic modulus of the frame 11 can be more flexible and convenient.

[0157] This application also provides a fusion device. The fusion device includes a frame 11 and a porous structure 12. The frame 11 includes a first end 111 and a second end 112 opposite to each other. A cavity 110 is provided within the frame 11, extending through the frame 11 in a direction X from the first end 111 to the second end 112. The frame 11 has at least one opening 114 communicating with the cavity 110. The frame 11 includes an outer peripheral surface 113, and the opening 114 extends from the cavity 110 to the outer peripheral surface 113. The porous structure 12 includes a first porous portion 121 and a second porous portion 123 connected to each other. The first porous portion 121 is accommodated within the cavity 110 and connected to the frame 11, while the second porous portion 123 is accommodated within the opening 114 and connected to the inner peripheral surface 115 of the opening 114.

[0158] In the direction X from the first end 111 to the second end 112, the porosity of the first porous portion 121 first decreases and then increases, and the porosity of the second porous portion 123 first decreases and then increases; the first porous portion 121 includes a bone graft window 1214 extending in the direction X from the first end 111 to the second end 112, and in the direction Y from the bone graft window 1214 to the frame 11, the porosity of the first porous portion 121 gradually decreases.

[0159] The specific structures of the frame 11 and the porous structure 12 can be referred to in the above embodiments, and will not be repeated here.

[0160] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0161] The fusion device and spinal implant provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A spinal implant, characterized in that, include: A frame includes a first end and a second end opposite to each other. A cavity is provided inside the frame, and the cavity extends through the frame in a direction from the first end to the second end. At least one opening communicating with the cavity is opened on the outer periphery of the frame. The frame includes an outer peripheral surface, and the opening extends from the cavity to the outer peripheral surface. A porous structure includes a first porous portion, which is housed within the cavity and connected to the frame. The first porous portion includes a first part, a second part, and a third part distributed sequentially from the first end to the second end. The porosity of the first part and the third part is greater than that of the second part. The porosity of the first part gradually decreases along the direction from the first end to the second end, the porosity of the third part gradually increases along the direction from the first end to the second end, and the porosity of the second part first decreases and then increases along the direction from the first end to the second end. The porosity of the first porous portion increases or decreases by more than or equal to 10% and less than or equal to 25% per 1 mm; the wire diameter of the first porous portion is more than or equal to 200 μm and less than or equal to 600 μm; the inscribed circle diameter of the holes in the first porous portion is more than or equal to 300 μm and less than or equal to 1200 μm; the first porous portion includes a bone graft window extending in the direction from the first end to the second end; the porosity of the first porous portion gradually decreases in the direction from the bone graft window to the frame. The porous structure further includes a second porous portion connected to the first porous portion. The second porous portion is housed within at least one of the openings and connected to the inner circumferential surface of the opening. In the direction from the first end to the second end, the pore size of the second porous portion first decreases and then increases.

2. The spinal implant as described in claim 1, characterized in that, The minimum porosity of the first part is greater than or equal to the maximum porosity of the second part.

3. The spinal implant as described in claim 1, characterized in that, The first portion extends from the first end to the second portion; and / or, the third portion extends from the second end to the second portion.

4. The spinal implant as described in claim 1, characterized in that, In the direction from the first end to the second end, the minimum porosity of the second portion is located in the middle of the spinal implant.

5. The spinal implant as described in any one of claims 1 to 4, characterized in that, In the direction from the first end to the second end, the difference between the maximum porosity and the minimum porosity of the first porous portion is greater than or equal to 60%.

6. The spinal implant as described in any one of claims 1 to 4, characterized in that, In the direction from the first end to the second end, the maximum porosity of the first porous portion is greater than or equal to 60% and less than or equal to 90%; and / or, In the direction from the first end to the second end, the minimum porosity of the first porous portion is greater than or equal to 30% and less than or equal to 60%.

7. The spinal implant as described in any one of claims 1 to 4, characterized in that, The first porous portion includes a first end face and a second end face, the first end face and the second end face are distributed sequentially along the direction from the first end to the second end, and the first end face and / or the second end face form a bone graft opening communicating with the bone graft window; The first porous portion includes a first sub-porous portion and a second sub-porous portion distributed sequentially along the direction from the bone graft window to the frame, wherein the porosity of the first sub-porous portion is greater than the porosity of the second sub-porous portion.

8. The spinal implant as claimed in claim 7, characterized in that, In the direction from the bone graft window to the frame, the porosity of the first sub-porous portion gradually decreases; and / or, In the direction from the bone graft window to the frame, the porosity of the second sub-porous portion gradually decreases.

9. The spinal implant as claimed in claim 7, characterized in that, In the direction from the bone graft window to the frame, the difference between the maximum porosity and the minimum porosity of the first porous portion is greater than or equal to 60%.

10. The spinal implant as claimed in claim 7, characterized in that, In the direction from the bone graft window to the frame, the maximum porosity of the first porous portion is greater than or equal to 60% and less than or equal to 90%; and / or, In the direction from the bone graft window to the frame, the minimum porosity of the first porous portion is greater than or equal to 30% and less than or equal to 60%.

11. The spinal implant as claimed in claim 7, characterized in that, In the direction from the bone graft window to the frame, the porosity of the first porous portion decreases by more than or equal to 6% and less than or equal to 12% per 1 mm.

12. The spinal implant according to any one of claims 1 to 4, characterized in that, The first porous portion includes a first end face and a second end face, which are distributed sequentially along the direction from the first end to the second end; the first end face and / or the second end face are provided with anti-slip protrusions, which include a contact surface for contacting the spine, and the contact surface is a convex curved surface.

13. The spinal implant as described in any one of claims 1 to 4, characterized in that, The first porous portion includes a first end face and a second end face, the first end face and the second end face are distributed sequentially along the direction from the first end to the second end, and the first end face and / or the second end face form a bone graft opening communicating with the bone graft window; the spinal implant also includes at least one first reinforcing portion, the first reinforcing portion extends circumferentially along the bone graft window and is spaced apart from the frame.

14. The spinal implant as claimed in claim 13, characterized in that, At least one of the bone graft sites is provided with the first reinforcing portion.

15. The spinal implant according to any one of claims 1 to 4, characterized in that, The spinal implant also includes a second reinforcing portion, a part of which is located within the opening and spaced apart from the inner circumferential surface. The second reinforcing portion has a through hole for an instrument to pass through, and the second porous portion within the opening is connected between the second reinforcing portion and the inner circumferential surface.

16. The spinal implant as claimed in claim 15, characterized in that, The spinal implant further includes a third reinforcing portion disposed within at least one of the openings, the third reinforcing portion being connected to the inner peripheral surfaces of at least two sides of the opening, and a second porous portion within the opening being connected between the third reinforcing portion and the inner peripheral surfaces.

17. The spinal implant as claimed in claim 16, characterized in that, The third reinforcing part and the second reinforcing part are distributed on both sides of the cavity.

18. The spinal implant as claimed in any one of claims 1 to 4, characterized in that, The number of openings is multiple, and the multiple openings are spaced apart along the circumference of the frame; each opening is provided with the second multi-hole portion.

19. The spinal implant according to any one of claims 1 to 4, characterized in that, The spinal implants include interbody fusion devices or artificial vertebral bodies.

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