Fusion and 3D printed fusion

Abstract

This application discloses a fusion device and a 3D-printed fusion device, comprising a fusion device body, at least one bone screw, and a limiting member. The fusion device body has at least one mounting hole and at least one screw hole on one side along a first direction. The fusion device body is used for implantation into the spine, so that at least one side of the fusion device body along a second direction contacts the spine. The bone screw is used to pass through the screw hole and be implanted into the spine along the second direction side of the fusion device body. The limiting member includes a limiting part and a connecting part connected to each other. The connecting part is installed in the mounting hole, and the limiting part is used to abut against at least one bone screw to prevent at least one bone screw from dislodging from the screw hole. The connecting part has a snap-fit ​​part that snaps into the fusion device body to prevent the connecting part from dislodging from the mounting hole. Therefore, the connection between the connecting part and the fusion device body is more stable and convenient, and the riveting force between the limiting member and the fusion device body will not be too large or too small, thus affecting the connection stability between the limiting member and the fusion device body.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more particularly to a fusion device and a 3D printed fusion device. Background Technology

[0002] A fusion device is a commonly used medical device in spinal surgery. After the fusion device body is implanted into the spine, bone screws are inserted through the fusion device body and into the spine to fix the fusion device to the spine. Moreover, in order to prevent the bone screws from loosening relative to the fusion device body, a limiting member is usually provided on the fusion device body to abut against the bone screws and limit their movement.

[0003] In related technologies, the limiting component and the fusion body are connected by a press-fitting method. The press-fitting force between the limiting component and the fusion body is unstable, which can easily lead to an unstable connection between the limiting component and the fusion body. Summary of the Invention

[0004] This application provides a fusion device and a 3D printing fusion device, which only solves the problem of the stability of the connection between the limiting member and the fusion device body in the related art.

[0005] This application provides a 3D printing fusion device, including:

[0006] The fusion device body has a mounting hole and multiple screw holes on one side along the first direction. The fusion device body is a 3D printed integral structure. The fusion device body is used to be implanted into the spine, so that the two sides of the fusion device body along the second direction respectively contact the spine. The second direction forms an angle with the first direction.

[0007] Multiple bone screws are used to pass through the multiple screw holes in a one-to-one correspondence. At least one of the bone screws is used to be implanted into the spine on one side of the fusion body along the second direction, and at least another bone screw is used to be implanted into the spine on the other side of the fusion body along the second direction.

[0008] The limiting member includes a limiting part and a connecting part that are connected to each other. The connecting part is inserted into the mounting hole, and the limiting part is used to abut against the plurality of bone screws to prevent the plurality of bone screws from coming out of the screw hole.

[0009] The connecting part is provided with a snap-fit ​​part, which snaps into the fusion body to prevent the connecting part from coming out of the mounting hole.

[0010] In some embodiments, the connecting portion includes an elastic portion, the snap-fit ​​portion is disposed on the elastic portion, and the elastic portion can elastically deform in the radial direction of the mounting hole, allowing the snap-fit ​​portion to enter the mounting hole; and / or,

[0011] The snap-fit ​​portion is elastic and can undergo elastic deformation in the radial direction of the mounting hole, allowing the snap-fit ​​portion to enter the mounting hole.

[0012] In some embodiments, the fusion body includes an inner peripheral surface that surrounds the mounting hole, and the connecting portion includes an outer peripheral surface opposite to the inner peripheral surface;

[0013] Wherein, the snap-fit ​​portion protrudes from the outer peripheral surface; or,

[0014] The snap-fit ​​portion includes a groove formed on the outer peripheral surface, and the fusion body has a protrusion. The protrusion is inserted into the groove so that the snap-fit ​​portion snaps into the fusion body.

[0015] In some embodiments, the fusion unit further includes an elastic member disposed on the side of the limiting portion near the connecting portion. One end of the elastic member abuts against the limiting portion, and the other end of the elastic member abuts against the fusion unit body. The elastic member is used to apply an elastic force to the limiting member so that the limiting member remains in contact with the fusion unit body.

[0016] This application embodiment also provides a fusion device, including:

[0017] The fusion device body has at least one mounting hole and at least one screw hole on one side along a first direction. The fusion device body is used for implantation into the spine, so that at least one side of the fusion device body along a second direction contacts the spine, and the second direction forms an angle with the first direction.

[0018] At least one bone screw is used to pass through the screw hole and be implanted into the spine on one side of the fusion body along the second direction;

[0019] A limiting member includes a limiting part and a connecting part that are connected to each other. The connecting part is installed in the mounting hole, and the limiting part is used to abut against at least one of the bone screws to prevent at least one of the bone screws from dislodging from the screw hole.

[0020] The connecting part is provided with a snap-fit ​​part, which snaps into the fusion body to prevent the connecting part from coming out of the mounting hole.

[0021] In some embodiments, the connecting portion includes an elastic portion, the snap-fit ​​portion is disposed on the elastic portion, and the elastic portion can elastically deform in the radial direction of the mounting hole, allowing the snap-fit ​​portion to enter the mounting hole; and / or,

[0022] The snap-fit ​​portion is elastic and can undergo elastic deformation in the radial direction of the mounting hole, allowing the snap-fit ​​portion to enter the mounting hole.

[0023] In some embodiments, the connecting portion includes a plurality of elastic portions spaced apart, and each of the plurality of elastic portions is provided with a snap-fit ​​portion.

[0024] In some embodiments, a plurality of the elastic portions are distributed sequentially along the circumference of the mounting hole.

[0025] In some embodiments, the connecting portion includes two elastic structures spaced apart along a third direction, the two elastic structures having a first gap between them; the elastic structure includes at least one of the elastic portions.

[0026] In some embodiments, the elastic structure includes at least two elastic portions spaced apart along a fourth direction, with a second interval between adjacent elastic portions of the elastic structure, and the third direction, the fourth direction, and the first direction forming an angle with each other.

[0027] The snap-fit ​​portion is located on the side of the corresponding elastic portion that is away from the first interval, and the width of the first interval is greater than the width of the second interval.

[0028] In some embodiments, the limiting portion protrudes from both sides of the connecting portion along the third direction, and the snap-fit ​​portion is disposed on the side of the corresponding elastic portion opposite to the first interval.

[0029] In some embodiments, the fusion body includes an inner peripheral surface that surrounds the mounting hole, and the connecting portion includes an outer peripheral surface opposite to the inner peripheral surface;

[0030] Wherein, the snap-fit ​​portion protrudes from the outer peripheral surface; or,

[0031] The snap-fit ​​portion includes a groove formed on the outer peripheral surface, and the fusion body is provided with a snap-fit ​​structure. The snap-fit ​​structure is inserted into the groove so that the snap-fit ​​portion snaps into the fusion body.

[0032] In some embodiments, the fusion unit further includes an elastic member disposed on the side of the limiting portion near the connecting portion. One end of the elastic member abuts against the limiting portion, and the other end of the elastic member abuts against the fusion unit body. The elastic member is used to apply an elastic force to the limiting member so that the limiting member remains in contact with the fusion unit body.

[0033] In some embodiments, the elastic member is used to cause the side of the limiting portion near the connecting portion to abut against the fusion body; or...

[0034] The elastic element is used to make the side of the snap-fit ​​portion near the limiting portion abut against the fusion body.

[0035] In some embodiments, the mounting hole includes a first hole segment and a second hole segment that are sequentially connected in a direction away from the limiting portion. The first hole segment and the second hole segment are respectively used to mount the connecting portion. The inner diameter of the first hole segment is larger than the inner diameter of the second hole segment, and the elastic element is accommodated in the first hole segment.

[0036] In some embodiments, the fusion body includes an inner peripheral surface that surrounds and forms the mounting hole; the inner peripheral surface includes an abutment surface located at one end of the first hole segment near the second hole segment, and the side of the elastic member away from the limiting portion abuts against the abutment surface.

[0037] In some embodiments, the elastic element is a ring structure and is sleeved on the connecting portion;

[0038] The elastic element includes opposing convex and concave surfaces, with the convex surface facing the limiting portion and abutting against it; or,

[0039] The elastic element includes a spring washer.

[0040] In some embodiments, the snap-fit ​​portion is at least partially accommodated within the mounting hole, the mounting hole having a snap-fit ​​structure that snaps into the snap-fit ​​portion.

[0041] In some embodiments, the mounting hole includes a second hole segment and a third hole segment that are sequentially connected in a direction away from the limiting portion, the inner diameter of the third hole segment is larger than the inner diameter of the second hole segment, the snap-fit ​​structure is located in the second hole segment, and the snap-fit ​​portion is at least partially accommodated in the third hole segment.

[0042] In some embodiments, the snap-fit ​​structure includes a limiting surface located at one end of the snap-fit ​​structure near the third hole segment; the limiting surface is used to abut against the snap-fit ​​portion to prevent the connecting portion from disengaging from the mounting hole.

[0043] In some embodiments, the fusion device body has a bone graft window, the mounting hole communicates with the bone graft window, the fusion device body includes an inner side surface that surrounds the bone graft window, and the snap-fit ​​portion abuts against the inner side surface to prevent the connecting portion from dislodging from the mounting hole.

[0044] In some embodiments, the fusion unit body is a single-piece structure.

[0045] The fusion device provided in this application embodiment has at least one mounting hole and at least one screw hole on one side of the fusion device body along a first direction, and a snap-fit ​​part is provided at the connecting part of the limiting member. When the fusion device is implanted into the spine, and the bone screw passes through the screw hole and is implanted into the spine along the second direction of the fusion device body to fix the fusion device body to the spine, the connecting part can be installed in the mounting hole, so that the limiting part abuts against at least one bone screw to prevent at least one bone screw from dislodging from the screw hole. At the same time, the snap-fit ​​part provided in the connecting part can also snap into the fusion device body to prevent the connecting part from dislodging from the mounting hole, making the connection between the connecting part and the fusion device body more stable and convenient. There will be no excessive or insufficient riveting force between the limiting member and the fusion device body, which would affect the connection stability between the limiting member and the fusion device body. Attached Figure Description

[0046] 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.

[0047] Figure 1 A schematic diagram of the structure of one embodiment of the fusion device provided in this application;

[0048] Figure 2 An exploded view of one embodiment of the fusion device provided in this application;

[0049] Figure 3 A cross-sectional view of one embodiment of the fusion body provided in this application, wherein the cutting plane is parallel to the first direction and the second direction;

[0050] Figure 4 A cross-sectional view of another embodiment of the fusion body provided in this application, wherein the cutting plane is parallel to the first direction and the second direction;

[0051] Figure 5 A schematic diagram of the structure of one embodiment of the limiting member provided in this application;

[0052] Figure 6 A schematic diagram of another embodiment of the limiting member provided in this application;

[0053] Figure 7 A schematic diagram of the structure of one embodiment of the elastic element provided in this application;

[0054] Figure 8 This is a schematic diagram of another embodiment of the elastic element provided in this application.

[0055] Fusion device 1; Fusion device body 10; Screw hole 11; Inner peripheral surface 12; Abutment surface 121; Mounting hole 13; First hole segment 131; Second hole segment 132; Third hole segment 133; Snap-fit ​​structure 14; Limiting surface 141; Inner surface 15; Bone graft window 151; Receiving groove 16; Bone screw 20; Limiting member 30; Limiting part 31; Connecting part 32; Outer peripheral surface 321; Elastic structure 322; Elastic part 3221; First interval 323; Second interval 324; Snap-fit ​​part 325; Elastic member 40; Convex surface 41; Concave surface 42; First direction X; Second direction Y; Third direction P; Fourth direction Q. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] A fusion device is a commonly used medical device in spinal surgery. It is primarily implanted into the spine to allow the spine and device to fuse together, thus achieving spinal rehabilitation. After the fusion device body is implanted into the spine, bone screws are inserted through the fusion device body and into the spine to fix the fusion device to the spine. Furthermore, to prevent the bone screws from loosening relative to the fusion device body, a limiting device is typically located on the fusion device body to abut against the bone screws and keep them in place.

[0062] However, in related technologies, the limiting component and the fusion body are connected by a riveting method. The riveting force between the limiting component and the fusion body is unstable, which can easily lead to an unstable connection between the limiting component and the fusion body.

[0063] To address the aforementioned issues, embodiments of this application provide a fusion mixer and a 3D printing fusion mixer. These will be described in detail below.

[0064] First, this application provides a fusion device.

[0065] Figure 1 This is a schematic diagram of the structure of one embodiment of the fusion device provided in this application. Figure 1As shown, the fusion device 1 includes a fusion device body 10 and at least one bone screw 20. The fusion device body 10 has at least one screw hole 11 on one side along a first direction X. The fusion device body 10 is used for implantation into the spine, so that at least one side of the fusion device body 10 along a second direction Y contacts the spine, and the second direction Y forms an angle with the first direction X. The bone screw 20 is used to pass through the screw hole 11 and be implanted into the spine along the second direction Y side of the fusion device body 10, thereby fixing the fusion device body 10 to the spine to facilitate rapid fusion of the spine and the fusion device body 10.

[0066] It should be noted that the fusion device body 10 can be implanted into a vertebra of the spine, in which case the vertebra and the implanted fusion device body 10 grow and fuse together. Alternatively, the fusion device body 10 can be an implant between two vertebrae of the spine, or implanted on one side of a vertebra of the spine, in which case the vertebra and the adjacent fusion device body 10 grow and fuse together. Bone screws 20 are used to pass through the screw holes 11 of the fusion device body 10 and are implanted into the vertebra on the Y side of the fusion device body 10 in the second direction to fix the fusion device body 10 to the vertebra.

[0067] In addition, the angle formed by the first direction X and the second direction Y can be a right angle or an acute angle, depending on the structure of the fusion body 10.

[0068] It is understood that when the fusion device body 10 is implanted into a vertebra, or between two adjacent vertebrae, the two sides of the fusion device body 10 along the second direction Y can contact and fuse with the vertebrae on both sides of the fusion device body 10. If the fusion device body 10 is implanted at the top or bottom of the spine, the vertebrae at the top or bottom of the pole abut against and fuse with the fusion device body 10 along the second direction Y.

[0069] In some embodiments, such as Figure 1 , Figure 2 and Figure 5 As shown, at least one mounting hole 13 is also provided on one side of the fusion device body 10 along the first direction X. The fusion device 1 also includes a limiting member 30, which includes a limiting part 31 and a connecting part 32 connected to each other. The connecting part 32 is installed in the mounting hole 13. The limiting part 31 is used to abut against at least one bone screw 20 to limit at least one bone screw 20 from coming out of the screw hole 11, thereby making the connection between the fusion device 1 and the spine more stable and preventing at least a part of the bone screw 20 from coming out of the screw hole 11, which would cause the bone screw 20 to damage human tissue.

[0070] The connecting part 32 may be provided with a snap-fit ​​part 325, which snaps into the fusion body 10 to prevent the connecting part 32 from coming out of the mounting hole 13.

[0071] The fusion device 1 provided in this embodiment has at least one mounting hole 13 and at least one screw hole 11 on one side of the fusion device body 10 along the first direction X, and a snap-fit ​​portion 325 is provided on the connecting portion 32 of the limiting member 30. When the fusion device 1 is implanted into the spine, and the bone screw 20 passes through the screw hole 11 and is implanted into the spine along the second direction Y of the fusion device body 10 to fix the fusion device body 10 to the spine, the connecting portion 32 can be installed in the mounting hole 13, so that the limiting portion 31 abuts against at least one bone screw 20 to prevent at least one bone screw 20 from coming out of the screw hole 11. At the same time, the snap-fit ​​portion 325 provided on the connecting portion 32 can also snap with the fusion device body 10 to prevent the connecting portion 32 from coming out of the mounting hole 13, so that the connection between the connecting portion 32 and the fusion device body 10 is more stable and convenient. There will be no excessive or insufficient riveting force between the limiting member 30 and the fusion device body 10, which would affect the connection stability between the limiting member 30 and the fusion device body 10.

[0072] In some embodiments, such as Figure 5 As shown, the connecting portion 32 can include an elastic portion 3221, with a snap-fit ​​portion 325 disposed on the elastic portion 3221. The elastic portion 3221 can elastically deform in the radial direction of the mounting hole 13, allowing the snap-fit ​​portion 325 to enter the mounting hole 13. During the process of installing the connecting portion 32 of the limiting member 30 into the mounting hole 13, the elastic portion 3221 can elastically deform in the radial direction of the mounting hole 13, allowing the snap-fit ​​portion 325 to displace in the radial direction of the mounting hole 13, so that the snap-fit ​​portion 325 can enter the mounting hole 13 without interfering with the fusion body 10. When the connecting portion 32 is inserted into the mounting hole 13 to a predetermined depth, the pressing force of the inner circumferential surface 12 of the mounting hole 13 on the snap-fit ​​portion 325 decreases or disappears, and the elastic portion 3221 automatically returns to its initial state, thereby driving the snap-fit ​​portion 325 to move radially along the mounting hole 13 to the position where it snaps into the fusion body 10. Thus, the connection between the limiting member 30 and the fusion body 10 can be made more convenient.

[0073] During the installation of the connecting portion 32 of the limiting member 30 into the mounting hole 13, the engaging portion 325 can abut against the inner circumferential surface 12 of the mounting hole 13. This causes the inner circumferential surface 12 of the mounting hole 13 to compress the elastic portion 3221 via the engaging portion 325, resulting in elastic deformation of the elastic portion 3221 in the radial direction of the mounting hole 13. Consequently, the engaging portion 325 displaces in the radial direction of the mounting hole 13, avoiding the fusion body 10 and allowing the engaging portion 325 to enter the mounting hole 13. Alternatively, external force can be used to compress the elastic portion 3221, causing it to elastically deform in the radial direction of the mounting hole 13 and displacing the engaging portion 325 in the radial direction of the mounting hole 13, thus allowing the engaging portion 325 to enter the mounting hole 13.

[0074] In some embodiments, such as Figure 6 As shown, the connecting portion 32 may include a plurality of elastic portions 3221 spaced apart, and each of the plurality of elastic portions 3221 is provided with a snap-fit ​​portion 325. Thus, the connecting portion 32 can snap into the fusion body 10 through the plurality of snap-fit ​​portions 325, which helps to improve the connection stability between the connecting portion 32 and the fusion body 10. Furthermore, the spaced arrangement of the plurality of elastic portions 3221 allows for elastic deformation space between adjacent elastic portions 3221, facilitating radial displacement of the snap-fit ​​portion 325 within the mounting hole 13.

[0075] Multiple elastic parts 3221 can be distributed sequentially along the circumference of the mounting hole 13 so that each of the multiple elastic parts 3221 can generate elastic deformation in the radial direction of the mounting hole 13.

[0076] Specifically, the connecting portion 32 includes two elastic structures 322 spaced apart along a third direction P, with a first gap 323 between the two elastic structures 322. Each elastic structure 322 includes at least one elastic portion 3221. Thus, the elastic portions 3221 of the two elastic structures 322 can elastically deform toward the first gap 323, so that the elastic portions 3221 and the snap-fit ​​portion 325 can generate a certain amount of displacement in the radial direction of the mounting hole 13.

[0077] The elastic structure 322 may include at least two elastic portions 3221 spaced apart along the fourth direction Q, with a second gap 324 between adjacent elastic portions 3221. The third direction P, the fourth direction Q, and the first direction X form an angle with each other. Therefore, adjacent elastic portions 3221 of the elastic structure 322 can undergo elastic deformation toward the second gap 324, which facilitates easier elastic deformation of the elastic portions 3221 of the elastic structure 322.

[0078] In some embodiments, the snap-fit ​​portion 325 can be disposed on the side of the corresponding elastic portion 3221 opposite to the first interval 323, and the width of the first interval 323 is greater than the width of the second interval 324. It is understood that, since the snap-fit ​​portion 325 is disposed on the side of the corresponding elastic portion 3221 opposite to the first interval 323, during the process of installing the connecting portion 32 of the limiting member 30 into the mounting hole 13, the elastic portion 3221 needs to undergo a relatively large elastic deformation toward the first interval 323, so that the snap-fit ​​portion 325 can enter the mounting hole 13 after undergoing a large displacement toward the first interval 323. By making the width of the first interval 323 greater than the width of the second interval 324, the elastic deformation of the elastic portion 3221 toward the first interval 323 can be increased, making it easier for the snap-fit ​​portion 325 to enter the mounting hole 13.

[0079] In some embodiments, the limiting portion 31 may protrude from both sides of the connecting portion 32 along the third direction P, and the locking portion 325 may be provided on the side of the corresponding elastic portion 3221 opposite to the first interval 323. Thus, at least one locking portion 325 and one limiting portion 31 are located on the same side of the connecting portion 32 along the third direction P. When the limiting portion 31 is pushed by the bone screw 20, causing the limiting portion 31 to drive the connecting portion 32 to move in the direction of disengagement from the mounting hole 13, the fusion device body 10 can apply a reverse force to the locking portion 325 located on the same side of the connecting portion 32 as the limiting portion 31, which can more effectively restrict the connecting portion 32 from disengaging from the mounting hole 13.

[0080] In other embodiments, the locking portion 325 can also be elastic, capable of elastic deformation in the radial direction of the mounting hole 13, allowing it to enter the mounting hole 13. During the process of installing the connecting portion 32 of the limiting member 30 into the mounting hole 13, the locking portion 325 can elastically deform in the radial direction of the mounting hole 13, allowing it to displace in that direction, facilitating its entry into the mounting hole 13 without interfering with the fusion body 10. When the connecting portion 32 is inserted into the mounting hole 13 to a predetermined depth, the pressure exerted by the inner circumferential surface 12 of the mounting hole 13 on the locking portion 325 decreases or disappears, and the locking portion 325 automatically returns to its initial state and engages with the fusion body 10. This makes the connection between the limiting member 30 and the fusion body 10 more convenient.

[0081] During the process of installing the connecting portion 32 of the limiting member 30 into the mounting hole 13, the locking portion 325 can abut against the inner circumferential surface 12 of the mounting hole 13, causing the inner circumferential surface 12 of the mounting hole 13 to press against the locking portion 325, resulting in elastic deformation of the locking portion 325 in the radial direction of the mounting hole 13. Alternatively, the locking portion 325 can also be elastically deformed in the radial direction of the mounting hole 13 by applying external force.

[0082] Furthermore, the connecting portion 32 may not include the elastic portion 3221, and the snap-fit ​​portion 325 may not be elastic. In this case, the connecting portion 32 or the snap-fit ​​portion 325 may be bent and deformed by external force or by the squeezing of the inner circumferential surface 12 of the mounting hole 13. After the connecting portion 32 is inserted into the mounting hole 13 to a predetermined depth, a tool may be used to apply force to the connecting portion 32 or the snap-fit ​​portion 325 to restore the connecting portion 32 or the snap-fit ​​portion 325 to its initial position, so that the snap-fit ​​portion 325 can snap into the fusion body 10.

[0083] like Figure 3 and Figure 6As shown, the fusion body 10 includes an inner peripheral surface 12, which surrounds and forms a mounting hole 13. The connecting portion 32 includes an outer peripheral surface 321 opposite to the inner peripheral surface 12. In some embodiments, the snap-fit ​​portion 325 may protrude from the outer peripheral surface 321 so that after the connecting portion 32 is installed into the mounting hole 13, the snap-fit ​​portion 325 snaps into the fusion body 10.

[0084] Specifically, the snap-fit ​​portion 325 protrudes from the elastic portion 3221 on the side opposite to the first interval 323. The elastic portion 3221 extends along the first direction X, one end of the elastic portion 3221 is connected to the limiting portion 31, and the other end of the elastic portion 3221 is a free end. The snap-fit ​​portion 325 is located at the free end of the elastic portion 3221.

[0085] In other embodiments, the snap-fit ​​portion 325 may include a groove (not shown) formed on the outer peripheral surface 321, and the fusion body 10 may be provided with a snap-fit ​​structure 14, which is inserted into the groove to snap the snap-fit ​​portion 325 into the fusion body 10. Specifically, the groove may be formed on the side of the elastic portion 3221 opposite to the first interval 323. The groove is located at the free end of the elastic portion 3221.

[0086] In some embodiments, such as Figure 1 and Figure 7 As shown, the fusion device 1 may further include an elastic element 40, which is disposed on the side of the limiting portion 31 near the connecting portion 32. One end of the elastic element 40 abuts against the limiting portion 31, and the other end of the elastic element 40 abuts against the fusion device body 10. The elastic element 40 is used to apply an elastic force to the limiting element 30, so that the limiting element 30 and the fusion device body 10 remain in contact. By using the elastic element 40 to keep the limiting element 30 and the fusion device body 10 in contact, the friction between the limiting element 30 and the fusion device body 10 can be increased. This helps to keep the position of the limiting element 30 relative to the fusion device body 10 stable, and reduces the possibility that the limiting element 30 rotates relative to the fusion device body 10 to a position where the limiting portion 31 covers the screw hole 11 before the bone screw 20 passes through the screw hole 11, which would otherwise make it inconvenient to insert the bone screw 20 into the screw hole 11.

[0087] The elastic member 40 can be used to make the side of the limiting part 31 near the connecting part 32 abut against the fusion body 10, thereby increasing the friction between the limiting part 31 and the fusion body 10. Alternatively, the elastic member 40 can also be used to make the side of the locking part 325 near the limiting part 31 abut against the fusion body 10, thereby increasing the friction between the locking part 325 and the fusion body 10.

[0088] like Figure 3As shown, the mounting hole 13 includes a first hole segment 131 and a second hole segment 132 connected sequentially in a direction away from the limiting part 31. The first hole segment 131 and the second hole segment 132 are respectively used to install the connecting part 32. The inner diameter of the first hole segment 131 is larger than the inner diameter of the second hole segment 132. The elastic member 40 is accommodated in the first hole segment 131, which makes the installation of the elastic member 40 more convenient, and the elastic member 40 can stably apply elastic force to the limiting member 30, so that the limiting member 30 keeps in contact with the fusion body 10.

[0089] Continue to refer to Figure 3 The fusion body 10 includes an inner peripheral surface 12, which encloses and forms a mounting hole 13. The inner peripheral surface 12 includes an abutment surface 121, which is located at one end of the first hole segment 131 near the second hole segment 132. The side of the elastic member 40 away from the limiting part 31 abuts against the abutment surface 121, thereby enabling the elastic member 40 to stably abut against the fusion body 10.

[0090] In some embodiments, the elastic element 40 can be a ring structure and sleeved on the connecting portion 32, thereby making the connection between the elastic element 40 and the limiting element 30 more stable.

[0091] The elastic member 40 may include opposing convex surfaces 41 and concave surfaces 42, with the convex surface 41 of the elastic member 40 facing and abutting against the limiting portion 31. Thus, the elastic member 40 can generate elastic deformation in the first direction X to apply an elastic force to the limiting portion 31.

[0092] In other embodiments, such as Figure 8 As shown, the elastic element 40 can also include a spring washer, so that after the elastic element 40 is sleeved on the connecting part 32, it can stably apply an elastic force to the limiting part 31.

[0093] In some embodiments, the snap-fit ​​portion 325 may be at least partially accommodated within the mounting hole 13, which is provided with a snap-fit ​​structure 14 that snaps into the snap-fit ​​portion 325. By accommodating the snap-fit ​​portion 325 at least partially within the mounting hole 13, the internal space occupied by the snap-fit ​​portion 325 in the fusion body 10 can be reduced, which is beneficial for increasing the space of the bone graft window 151 within the fusion body 10.

[0094] Among them, such as Figure 3 As shown, the mounting hole 13 can include a second hole segment 132 and a third hole segment 133 that are sequentially connected in a direction away from the limiting portion 31. The inner diameter of the third hole segment 133 is larger than the inner diameter of the second hole segment 132. The snap-fit ​​structure 14 is located in the second hole segment 132, and the snap-fit ​​portion 325 is at least partially accommodated in the third hole segment 133. Thus, the snap-fit ​​portion 325 can be at least partially accommodated in the mounting hole 13 and snap-fitted with the snap-fit ​​structure 14 in the mounting hole 13.

[0095] In some embodiments, the width of the snap-fit ​​portion 325 along the first direction X can be smaller than the length of the third hole segment 133 along the first direction X, so that the snap-fit ​​portion 325 is fully accommodated in the third hole segment 133, that is, the snap-fit ​​portion 325 is fully accommodated in the mounting hole 13.

[0096] like Figure 3 As shown, the snap-fit ​​structure 14 may include a limiting surface 141, which is located at one end of the snap-fit ​​structure 14 near the third hole segment 133. The limiting surface 141 is used to abut against the snap-fit ​​portion 325 to prevent the connecting portion 32 from dislodging from the mounting hole 13. When the snap-fit ​​portion 325 moves to the position corresponding to the third hole segment 133, the limiting surface 141 abuts against the snap-fit ​​portion 325, effectively limiting the snap-fit ​​portion 325 to the position corresponding to the third hole segment 133, thereby preventing the connecting portion 32 from dislodging from the mounting hole 13.

[0097] like Figure 4 As shown, the fusion device body 10 has a bone graft window 151, which is used to accommodate bone to promote the growth and fusion of the fusion device body 10 and the spine. The mounting hole 13 can communicate with the bone graft window 151. The fusion device body 10 includes an inner side surface 15 that surrounds the bone graft window 151. A locking portion 325 abuts against the inner side surface 15 to prevent the connecting portion 32 from dislodging from the mounting hole 13. Therefore, the locking portion 325 is not accommodated within the mounting hole 13, which helps to shorten the length of the mounting hole 13 and, without changing the overall dimensions of the fusion device body 10, allows for a larger size of the bone graft window 151.

[0098] The mounting hole 13 may not include the third hole segment 133. The connecting part 32 passes through the mounting hole 13 so that the snap-fit ​​part 325 provided on the connecting part 32 extends into the bone graft window 151 and abuts against the inner side surface 15 to prevent the connecting part 32 from coming out of the mounting hole 13.

[0099] In some embodiments, the fusion body 10 can be a single-piece structure to improve its structural strength. The fusion body 10 can be a 3D-printed single-piece structure to facilitate its fabrication.

[0100] In some embodiments, such as Figure 1 and Figure 2As shown, the fusion device body 10 has multiple screw holes 11 on one side along the first direction X. Multiple bone screws 20 are used to pass through the screw holes 11 one-to-one. At least one bone screw 20 is used for implantation into the spine on the second direction Y side of the fusion device body 10, and at least another bone screw 20 is used for implantation into the spine on the other side of the fusion device body 10 along the second direction Y. Thus, the fusion device body 10 can be fixedly connected to the vertebrae on both sides of the fusion device body 10 along the second direction Y by the bone screws 20, thereby making the connection between the fusion device body 10 and the spine more stable.

[0101] Specifically, the fusion device body 10 has two screw holes 11 on one side along the first direction X. There are two bone screws 20, which are used to pass through the two screw holes 11 one by one. One bone screw 20 is used to be implanted into the spine on the side of the fusion device body 10 along the second direction Y, and the other bone screw 20 is used to be implanted into the spine on the other side of the fusion device body 10 along the second direction Y.

[0102] like Figure 2 and Figure 3 As shown, the fusion body 10 also has a receiving groove 16 on one side along the first direction X, and a mounting hole 13 is formed on the bottom surface of the receiving groove 16. At least a part of the limiting part 31 is received in the receiving groove 16. Thus, the receiving groove 16 can play a certain limiting role on the limiting part 31, making the rotation of the limiting part 31 relative to the fusion body 10 more stable.

[0103] The bottom surface of the receiving groove 16 can be a concave curved surface, and the limiting part 31 has a convex curved surface that matches the concave curved surface on the side near the connecting part 32. Alternatively, the bottom surface of the receiving groove 16 can also be a plane, and the surface of the limiting member 30 on the side near the connecting part 32 is a plane that is substantially parallel to the bottom surface of the receiving groove 16.

[0104] Of course, the receiving groove 16 may not be provided on one side of the fusion body 10 along the first direction X, and the side of the limiting part 31 near the connecting part 32 may directly contact the side of the fusion body 10 along the first direction X.

[0105] In some embodiments, the connecting portion 32 can be rotatably mounted in the mounting hole 13. This allows the limiting member 30 to rotate relative to the fusion device body 10, rotating the limiting portion 31 to a position offset from the screw hole 11, so that the bone screw 20 can be inserted into the spine after passing through the screw hole 11. Furthermore, after the bone screw 20 passes through the screw hole 11, the limiting portion 31 can be rotated to a position covering the screw hole 11, so that the limiting portion 31 can abut against the bone screw 20 to prevent the bone screw 20 from dislodging from the screw hole 11.

[0106] This application embodiment also provides a 3D printing fusion processor. The 3D printing fusion processor includes:

[0107] The fusion device body 10 has a mounting hole 13 and multiple screw holes 11 on one side along the first direction X. The fusion device body 10 is a 3D printed integral structure. The fusion device body 10 is used to implant into the spine, so that the fusion device body 10 contacts the spine on both sides along the second direction Y. The second direction Y forms an angle with the first direction X.

[0108] Multiple bone screws 20 are used to pass through multiple screw holes 11 in a one-to-one correspondence. At least one bone screw 20 is used to be implanted into the spine on one side of the fusion body 10 along the second direction Y, and at least another bone screw 20 is used to be implanted into the spine on the other side of the fusion body 10 along the second direction Y.

[0109] The limiting member 30 includes a limiting part 31 and a connecting part 32 that are connected to each other. The connecting part 32 is inserted into the mounting hole 13, and the limiting part 31 is used to abut against a plurality of bone screws 20 to limit the plurality of bone screws 20 from coming out of the screw hole 11.

[0110] The connecting part 32 is provided with a snap-fit ​​part 325, which snaps into the fusion body 10 to prevent the connecting part 32 from coming out of the mounting hole 13.

[0111] In some embodiments, the connecting portion 32 may include an elastic portion 3221, and a snap-fit ​​portion 325 is disposed on the elastic portion 3221. The elastic portion 3221 can elastically deform in the radial direction of the mounting hole 13, allowing the snap-fit ​​portion 325 to enter the mounting hole 13; and / or,

[0112] The snap-fit ​​portion 325 is elastic and can undergo elastic deformation in the radial direction of the mounting hole 13, so that the snap-fit ​​portion 325 can enter the mounting hole 13.

[0113] In some embodiments, the fusion body 10 includes an inner peripheral surface 12, which surrounds and forms a mounting hole 13, and the connecting portion 32 includes an outer peripheral surface 321 opposite to the inner peripheral surface 12.

[0114] The snap-fit ​​portion 325 protrudes from the outer peripheral surface 321; or...

[0115] The snap-fit ​​portion 325 includes a groove formed on the outer peripheral surface 321, and the fusion body 10 is provided with a protrusion that inserts into the groove so that the snap-fit ​​portion 325 snaps into the fusion body 10.

[0116] In some embodiments, the fusion unit 1 further includes an elastic member 40, which is disposed on the side of the limiting portion 31 near the connecting portion 32. One end of the elastic member 40 abuts against the limiting portion 31, and the other end of the elastic member 40 abuts against the fusion unit body 10. The elastic member 40 is used to apply an elastic force to the limiting member 30 so that the limiting member 30 and the fusion unit body 10 remain in contact.

[0117] In this embodiment, the structure of the fusion body 10, bone screw 20, limiting member 30 and elastic member 40 of the 3D printed fusion device 1 can refer to the various embodiments of the fusion body 10, bone screw 20, limiting member 30 and elastic member 40 described above, and will not be repeated here.

[0118] 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.

[0119] The above provides a detailed description of a fusion device and a 3D printing fusion device provided in the embodiments of this application. 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 3D printing fusion device, characterized in that, include: The fusion device body has mounting holes and multiple screw holes on one side along the first direction. The fusion device body is a 3D printed integral structure. The fusion device body is used to implant into the spine, so that the two sides of the fusion device body along the second direction Y respectively contact the spine. The second direction Y forms an angle with the first direction. Multiple bone screws are used to pass through the multiple screw holes in a one-to-one correspondence. At least one of the bone screws is used to be implanted into the spine on one side of the fusion body along the second direction Y, and at least another bone screw is used to be implanted into the spine on the other side of the fusion body along the second direction Y. The limiting member includes a limiting part and a connecting part that are connected to each other. The connecting part is inserted into the mounting hole, and the limiting part is used to abut against the plurality of bone screws to prevent the plurality of bone screws from coming out of the screw hole. The connecting part is provided with a snap-fit ​​part, which snaps into the fusion body to prevent the connecting part from coming out of the mounting hole.

2. The 3D printing fusion device as described in claim 1, characterized in that, The connecting portion includes an elastic portion, and the snap-fit ​​portion is disposed on the elastic portion. The elastic portion can elastically deform in the radial direction of the mounting hole, allowing the snap-fit ​​portion to enter the mounting hole; and / or, The snap-fit ​​portion is elastic and can undergo elastic deformation in the radial direction of the mounting hole, allowing the snap-fit ​​portion to enter the mounting hole.

3. The 3D printing fusion device as described in claim 2, characterized in that, The fusion body includes an inner peripheral surface, which encloses and forms the mounting hole, and the connecting part includes an outer peripheral surface opposite to the inner peripheral surface; Wherein, the snap-fit ​​portion protrudes from the outer peripheral surface; or, The snap-fit ​​portion includes a groove formed on the outer peripheral surface, and the fusion body has a protrusion. The protrusion is inserted into the groove so that the snap-fit ​​portion snaps into the fusion body.

4. The 3D printing fusion device as described in claim 1, characterized in that, The fusion device further includes an elastic element, which is disposed on the side of the limiting portion near the connecting portion. One end of the elastic element abuts against the limiting portion, and the other end of the elastic element abuts against the fusion device body. The elastic element is used to apply an elastic force to the limiting element so that the limiting element and the fusion device body remain in contact.

5. A fusion device, characterized in that, include: The fusion device body has at least one mounting hole and at least one screw hole on one side along a first direction. The fusion device body is used for implantation into the spine, such that at least one side of the fusion device body along a second direction Y contacts the spine, and the second direction Y forms an angle with the first direction. At least one bone screw is used to pass through the screw hole and be implanted into the spine on the Y side of the fusion body along the second direction; A limiting member includes a limiting part and a connecting part that are connected to each other. The connecting part is installed in the mounting hole, and the limiting part is used to abut against at least one of the bone screws to prevent at least one of the bone screws from dislodging from the screw hole. The connecting part is provided with a snap-fit ​​part, which snaps into the fusion body to prevent the connecting part from coming out of the mounting hole.

6. The fusion device as described in claim 5, characterized in that, The connecting portion includes an elastic portion, and the snap-fit ​​portion is disposed on the elastic portion. The elastic portion can elastically deform in the radial direction of the mounting hole, allowing the snap-fit ​​portion to enter the mounting hole; and / or, The snap-fit ​​portion is elastic and can undergo elastic deformation in the radial direction of the mounting hole, allowing the snap-fit ​​portion to enter the mounting hole.

7. The fusion device as described in claim 6, characterized in that, The connecting portion includes a plurality of elastic portions spaced apart, and each of the plurality of elastic portions is provided with a snap-fit ​​portion.

8. The fusion device as described in claim 7, characterized in that, The plurality of elastic portions are distributed sequentially along the circumference of the mounting hole.

9. The fusion device as described in claim 7, characterized in that, The connecting portion includes two elastic structures spaced apart along a third direction, with a first gap between the two elastic structures; each elastic structure includes at least one of the elastic portions.

10. The fusion device as claimed in claim 9, characterized in that, The elastic structure includes at least two elastic portions spaced apart along a fourth direction, with a second interval between adjacent elastic portions, and the third direction, the fourth direction, and the first direction forming an angle with each other. The snap-fit ​​portion is located on the side of the corresponding elastic portion that is away from the first interval, and the width of the first interval is greater than the width of the second interval.

11. The fusion device as claimed in claim 9, characterized in that, The limiting portion protrudes from both sides of the connecting portion along the third direction, and the snap-fit ​​portion is located on the side of the corresponding elastic portion away from the first interval.

12. The fusion device as described in claim 5, characterized in that, The fusion body includes an inner peripheral surface, which encloses and forms the mounting hole, and the connecting part includes an outer peripheral surface opposite to the inner peripheral surface; Wherein, the snap-fit ​​portion protrudes from the outer peripheral surface; or, The snap-fit ​​portion includes a groove formed on the outer peripheral surface, and the fusion body is provided with a snap-fit ​​structure. The snap-fit ​​structure is inserted into the groove so that the snap-fit ​​portion snaps into the fusion body.

13. The fusion device according to any one of claims 5 to 12, characterized in that, The fusion device further includes an elastic element, which is disposed on the side of the limiting portion near the connecting portion. One end of the elastic element abuts against the limiting portion, and the other end of the elastic element abuts against the fusion device body. The elastic element is used to apply an elastic force to the limiting element so that the limiting element and the fusion device body remain in contact.

14. The fusion device as described in claim 13, characterized in that, The elastic element is used to cause the side of the limiting portion near the connecting portion to abut against the fusion body; or... The elastic element is used to make the side of the snap-fit ​​portion near the limiting portion abut against the fusion body.

15. The fusion device as described in claim 13, characterized in that, The mounting hole includes a first hole segment and a second hole segment that are sequentially connected in a direction away from the limiting part. The first hole segment and the second hole segment are respectively used to install the connecting part. The inner diameter of the first hole segment is larger than the inner diameter of the second hole segment. The elastic element is accommodated in the first hole segment.

16. The fusion device as claimed in claim 15, characterized in that, The fusion body includes an inner peripheral surface that surrounds and forms the mounting hole; the inner peripheral surface includes an abutting surface located at one end of the first hole segment near the second hole segment, and the side of the elastic member away from the limiting portion abuts against the abutting surface.

17. The fusion device as claimed in claim 13, characterized in that, The elastic element is a ring structure and is sleeved on the connecting part; The elastic element includes opposing convex and concave surfaces, with the convex surface facing the limiting portion and abutting against it; or, The elastic element includes a spring washer.

18. The fusion device according to any one of claims 5 to 12, characterized in that, The snap-fit ​​portion is at least partially accommodated within the mounting hole, and the mounting hole is provided with a snap-fit ​​structure, which snaps into the snap-fit ​​portion.

19. The fusion device as claimed in claim 18, characterized in that, The mounting hole includes a second hole segment and a third hole segment that are sequentially connected in a direction away from the limiting part. The inner diameter of the third hole segment is larger than the inner diameter of the second hole segment. The snap-fit ​​structure is located in the second hole segment, and the snap-fit ​​part is at least partially accommodated in the third hole segment.

20. The fusion device as claimed in claim 19, characterized in that, The snap-fit ​​structure includes a limiting surface located at one end of the snap-fit ​​structure near the third hole segment; the limiting surface is used to abut against the snap-fit ​​portion to prevent the connecting portion from dislodging from the mounting hole.

21. The fusion device according to any one of claims 5 to 12, characterized in that, The fusion device body has a bone graft window, the mounting hole communicates with the bone graft window, the fusion device body includes an inner side that surrounds the bone graft window, and the snap-fit ​​part abuts against the inner side to prevent the connecting part from coming out of the mounting hole.

22. The fusion device according to any one of claims 5 to 12, characterized in that, The fusion unit itself is a single-piece structure.

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