Multi-directional expansion fusion device and interbody implantation system

Abstract

This invention provides a multi-directional expandable fusion device and an interbody fusion implantation system. The multi-directional expandable fusion device includes an upper expandable body, a lower expandable body, a limiting support body, and an expandable driving structure. The first limiting support body is positioned between the first upper expandable body and the first lower expandable body, and the second limiting support body is positioned between the second upper expandable body and the second lower expandable body. The head expandable block and the tail expandable block respectively engage with each expandable body in a pushing-pushing cooperation, and the head expandable block and the tail expandable block respectively engage with each limiting support body in a pushing-pushing cooperation, so that the relative movement of the head expandable block and the tail expandable block allows each expandable body to open outwards along the height and width directions of the expandable fusion device. Therefore, the multi-directional expandable fusion device of this invention has the advantage of adjustable range in both width and height directions.

Description

Technical Field

[0001] This invention relates to the field of orthopedic implant technology, specifically to a multidirectional expandable fusion device and an intervertebral implantation system. Background Technology

[0002] Lumbar interbody fusion is an effective treatment for lumbar degeneration and instability. It fuses the upper and lower vertebrae, maintains the intervertebral space height, reduces nerve root pressure, and maintains spinal stability. It has the advantages of minimal surgical trauma and ease of operation. However, in recent years, with the promotion of clinical application and the advancement of theoretical research, it has been gradually discovered that conventional lumbar fusion cages still have certain shortcomings. For example, while existing distraction fusion cages can effectively maintain the intervertebral space height and alleviate symptoms caused by vertebral compression, some existing distraction fusion cages only offer height adjustment. Furthermore, to facilitate cage implantation into the intervertebral space, the surgical incision needs to be relatively large, resulting in a long wound healing time and large scar size.

[0003] In related technologies, for example Figure 19 As shown, the head-mounted expansion block has oblique grooves with included angles γ in both the height and width directions of the fusion device. An oblique rail control is set on the expansion drive structure to adjust the upper and lower expansion bodies in the width and height directions. Before implantation, the fusion device can be closed; after implantation, it can be adjusted to the expanded state, thereby reducing the incision size and supporting the intervertebral disc height. However, because the height and width are controlled by the oblique grooves, when the γ angle decreases, the width increases, but the height decreases, failing to achieve the desired effect; when the γ angle increases, the width decreases, resulting in poor lateral expansion and a small difference in size between the closed and expanded states. This limits the adjustment range of the fusion device in the width and height directions. Summary of the Invention

[0004] This invention aims to at least partially address one of the technical problems in related art. To this end, embodiments of the invention propose a multi-directional expandable fusion joint. This multi-directional expandable fusion joint has the advantage of increasing the adjustment range of the multi-directional expandable fusion joint in the width and height directions.

[0005] Embodiments of the present invention also propose an intervertebral implantable system.

[0006] The multi-directional expandable fusion device of this invention has a convertible closing state and an expandable state.

[0007] The multi-directional expandable fusion device includes an upper expandable body, a lower expandable body, a limiting support body, and an expandable drive structure.

[0008] The upper supporting body and the lower supporting body are detachably disposed opposite each other along the height direction of the expanding fusion member. The upper supporting body includes a first upper supporting body and a second upper supporting body that are detachably disposed opposite each other along the width direction of the expanding fusion member. The lower supporting body includes a first lower supporting body and a second lower supporting body that are detachably disposed opposite each other along the width direction of the expanding fusion member. The limiting support body includes a first limiting support body and a second limiting support body that are detachably disposed opposite each other along the width direction of the expanding fusion member. The first limiting support body is limited between the first upper supporting body and the first lower supporting body, and the second limiting support body is limited between the second upper supporting body and the second lower supporting body. The expanding fusion member... The driving structure includes a head opening block, a tail opening block, and a driving rod that drives the head opening block and the tail opening block to move relative to each other along the length direction of the opening fusion device. The head opening block and the tail opening block are respectively engaged with each opening body to push and cooperate, so as to drive each opening body to open outward along the height direction of the opening fusion device during the relative movement of the head opening block and the tail opening block. The head opening block and the tail opening block are respectively engaged with each limiting support body to push and cooperate, so as to drive each limiting support body to open outward along the width direction of the opening fusion device during the relative movement of the head opening block and the tail opening block, thereby realizing that each opening body opens outward along the height and width directions of the opening fusion device.

[0009] The multi-directional expandable fusion device of this invention, through the mutual cooperation of a limiting support body, a head expanding block and a tail expanding block, enables the first limiting support body and the second limiting support body to open along the width direction of the expandable fusion device, and then achieves opening along the width direction of the expandable fusion device through the limiting between the first limiting support body and the second limiting support body and the corresponding side upper expanding body and lower expanding body.

[0010] Simultaneously, the pushing action of the upper and lower expansion bodies with the head and tail expansion blocks adjusts the distance between them. In other words, the pushing action between the head and tail expansion blocks and each expansion body adjusts the height of the fusion device. Simultaneously, the pushing action between the head and tail expansion blocks and each limiting support adjusts the width, and the limiting supports pull the upper and lower expansion bodies corresponding to the width of the fusion device, causing them to slide relative to the head and tail expansion blocks in the width direction of the fusion device. This allows the fusion device to adjust both its height and width simultaneously, thereby adjusting the contact area in the width direction. Therefore, this multi-directional fusion device increases bony fusion and ensures spinal stability.

[0011] Furthermore, the head and tail expansion blocks respectively engage with each limiting support body in a pushing-pushing manner. Their width adjustment trajectory is the movement trajectory of each limiting support body relative to the head and tail expansion blocks, and its adjustment range is based on the inclination angle β of the pushing-pushing mating surfaces. Similarly, the head and tail expansion blocks respectively engage with each expansion body in a pushing-pushing manner. Their height adjustment trajectory is the movement trajectory of each expansion body relative to the head and tail expansion blocks, and its adjustment range is based on the inclination angle α of the pushing-pushing mating surfaces. The height and width expansion trajectories are independent and do not interfere with each other. This allows the expansion fusion device to be adjusted in both height and width directions according to requirements, avoiding the problem of limited adjustment range in the width and height directions, thus helping to reduce incision size and improve postoperative wound healing.

[0012] Therefore, the multi-directional expandable fusion device of the present invention has the advantage of adjustable range in both width and height directions.

[0013] In some embodiments, the head opening block and the tail opening block each have an inclined driving surface on both sides of the opening fusion device in the height direction, and the inclined driving surfaces of the head opening block and the tail opening block are symmetrically arranged along the length direction of the opening fusion device. Each opening body has a mating contact surface, and each mating contact surface slides and pushes against each inclined driving surface so that when the head opening block and the tail opening block move, each opening body opens outward along the height direction of the opening fusion device.

[0014] The head opening block and the tail opening block each have one of an inclined drive rail and an inclined drive groove on both sides of the opening fusion device in the width direction. Each limiting support has the other of the inclined drive rail and the inclined drive groove at both ends of the opening fusion device in the width direction. The inclined drive rail can be slidably disposed in the inclined drive groove so that when the head opening block and the tail opening block move relative to each other, each opening body opens outward along the width direction of the opening fusion device. This is achieved by driving each limiting support to move in the width direction, thereby causing each opening body to open outward along the width of the opening fusion device.

[0015] In some embodiments, each limiting support has one of a vertical beam and a vertical slide groove, and each expansion body has the other of the vertical beam and the vertical slide groove. The vertical beam can slide relative to each other through the vertical slide groove so that the upper expansion body, the limiting support body, and the lower expansion body move synchronously in the width direction.

[0016] In some embodiments, the head opening block and the tail opening block include opening block bodies, connecting portions, and inclined plate bodies. The inclined plate body forms the inclined driving surface. The opening block body and the inclined plate body are connected through the connecting portion. The opening block body has an inclined surface parallel to the inclined driving surface. A first limiting groove is formed between the opening block body and the inclined plate body. The inclined plate body forms a first limiting protrusion. Each opening body has a second limiting groove. The end of each opening body forms a second limiting protrusion with the sidewall of the second limiting groove. The first limiting protrusion is slidably inserted into the second limiting groove. The second limiting protrusion is slidably inserted into the first limiting groove. The sidewall of the second limiting groove slides against the inclined driving surface so that when the head opening block and the tail opening block move, each opening body opens outward along the height and width directions of the opening fusion device.

[0017] In some embodiments, the first limiting slide and the second limiting slide are open in the height direction of the expanding fusion member, and the openings of the first limiting slide and the first limiting slide are disposed on one side facing the width direction of the expanding fusion member.

[0018] In some embodiments, both the tilt drive rail and the tilt drive groove are dovetail-shaped.

[0019] In some embodiments, when viewed from the height direction of the expansion fusion unit, the inclined drive groove tends to expand outwards; when viewed from the length direction of the expansion fusion unit, the inclined drive groove is a long groove extending along the length direction of the expansion fusion unit; and the angle α between the inclined drive groove and the width direction of the expansion fusion unit is 35-55 degrees.

[0020] In some embodiments, the angle β between the inclined driving surface and the longitudinal direction of the spreading fusion device is 40-50 degrees.

[0021] In some embodiments, the first upper support body, the second upper support body, the first lower support body, and the second lower support body each have a receiving groove on the inner side of the width direction of the expansion fusion device, and a plurality of receiving groove-shaped receiving cavities. When the expansion fusion device is in the closed state, the first limiting support body and the second limiting support body are disposed in the receiving cavity. The first upper support body and the first lower support body, the second upper support body and the second lower support body are all in close contact. Each support body, each limiting support body, the head expansion block and the tail expansion block together form a sealed whole. When the expansion fusion device is in the closed state, the first upper support body, the second upper support body, the first lower support body, the second lower support body, the first lower support body and the second lower support body gradually separate, and overflow gaps are formed between the first upper support body and the second upper support body, and between the first lower support body and the second lower support body.

[0022] In some embodiments, the tail expansion block includes a front drive ring body, a tail expansion block, and a pair of lateral connecting arms connecting the front drive ring body and the tail expansion block. The internal cavity enclosed by the tail expansion block is used as a bone graft cavity, the bone graft cavity is in communication with the receiving cavity, the tail of the drive rod is located on the front drive ring body, and the tail expansion block is provided with an insertion opening that communicates with the bone graft cavity for inserting an operating instrument.

[0023] In some embodiments, the head expansion block is provided with a first drive rod mounting hole, and the front drive ring of the tail expansion block is provided with a second drive rod mounting hole. The head of the drive rod is threadedly connected to the first drive rod mounting hole, and the tail of the drive rod is axially fixed and circumferentially rotatable connected to the second drive rod mounting hole. The middle part of the drive rod is provided with an annular groove, and a retaining ring that stops and cooperates with the front end face of the front drive ring is provided in the annular groove.

[0024] In some embodiments, the front end of the head expansion block is pointed, and the rear end of the tail expansion block has a holding groove or a holding protrusion.

[0025] In some embodiments, at least one of the first upper support body, the second upper support body, the first lower support body, and the second lower support body is a porous structure with porous structure regions on both sides.

[0026] In some embodiments, each support body is a 3D printed part.

[0027] In some embodiments, the outer surface of each expander is coated with a hydroxyapatite coating.

[0028] The intervertebral disc implantation system of this invention includes an implanter and a multidirectional expandable fusion device according to any one of the above-mentioned methods. The implanter is connected to the expandable driving structure. The implanter adjusts the relative position of the head expandable block and the tail expandable block by a drive rod, so that the expandable fusion device can be transformed between the closed state and the expanded state by the head expandable block and the tail expandable block moving in conjunction with each expandable body and the limiting support body respectively. Attached Figure Description

[0029] Figure 1 This is a perspective view of a multi-directional expandable fusion device according to an embodiment of the present invention, wherein the expandable fusion device is in a closed state.

[0030] Figure 2 This is another perspective view of the multi-directional expandable fusion device according to an embodiment of the present invention, which is in a closed state.

[0031] Figure 3This is a perspective view of a multidirectional expandable fusion device according to an embodiment of the present invention, wherein the expandable fusion device is in an expanded state.

[0032] Figure 4 This is an exploded view of the multidirectional expandable fusion device according to an embodiment of the present invention.

[0033] Figure 5 This is a perspective view of a multidirectional expandable fusion device according to an embodiment of the present invention, omitting the first upper expandable body.

[0034] Figure 6 This is a perspective view of a multidirectional expandable fusion device according to an embodiment of the present invention, omitting the first upper expandable body and the first limiting support body.

[0035] Figure 7 This is a front view of a multi-directional expandable fusion device according to an embodiment of the present invention, wherein the expandable fusion device is in a closed state.

[0036] Figure 8 This is a front view of a multidirectional expandable fusion device according to an embodiment of the present invention, wherein the expandable fusion device is in an expanded state.

[0037] Figure 9 This is a side view of the multidirectional expandable fusion device according to an embodiment of the present invention.

[0038] Figure 10 This is a top view of the multidirectional expandable fusion device according to an embodiment of the present invention.

[0039] Figure 11 This is a perspective view of the head expansion block and drive rod in an embodiment of the present invention.

[0040] Figure 12 This is a perspective view of the head expansion block according to an embodiment of the present invention.

[0041] Figure 13 This is a perspective view of the head expansion block and the first limiting support body in cooperation according to an embodiment of the present invention.

[0042] Figure 14 This is a perspective view of the first limiting support body according to an embodiment of the present invention.

[0043] Figure 15 This is a perspective view of the head support block and the second upper support body in cooperation according to an embodiment of the present invention.

[0044] Figure 16 This is a perspective view of the second upper support body according to an embodiment of the present invention.

[0045] Figure 17 This is a perspective view of the drive rod according to an embodiment of the present invention.

[0046] Figure 18 This is a perspective view of the tail-spreading block according to an embodiment of the present invention.

[0047] Figure 19 This is a side view of the expandable fusion device in related technologies.

[0048] Figure label:

[0049] Expand the fusion unit by 100;

[0050] Upper open body 1;

[0051] First upper support body 11; Second upper support body 12;

[0052] Lower support body 2;

[0053] First lower support body 21; second lower support body 22; vertical sliding groove 120; overflow hole 121; second limiting sliding groove 122; second limiting protrusion 123; mating contact surface 124; receiving groove 125;

[0054] Limiting support 3;

[0055] First limiting support 31; Second limiting support 32; Inclined drive rail 312; Vertical beam 300;

[0056] Expand the drive structure 4;

[0057] Head opening block 41; first drive rod mounting hole 411; first limiting slide groove 412; first limiting protrusion 413; inclined drive surface 414; inclined drive groove 415;

[0058] Support block 401; Connecting part 402; Inclined panel 403;

[0059] Tail extension block 42; second drive rod mounting hole 421; holding groove 422; front drive ring 423; tail extension block 424; connecting arm 425;

[0060] Drive lever 43;

[0061] Ring 5. Detailed Implementation

[0062] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0063] The following is for reference. Figures 1-18 This invention describes a multidirectional expandable fusion device 100 and an interbody implantation system according to embodiments of the present invention.

[0064] The multi-directional expandable fusion device 100 of this invention has a convertible closing state and an expanding state.

[0065] The multi-directional expandable fusion device 100 includes an upper expandable body 1, a lower expandable body 2, a limiting support body 3, and an expandable driving structure 4.

[0066] The upper support body 1 and the lower support body 2 are detachably arranged opposite each other along the height direction of the expansion fusion device 100. The upper support body 1 includes a first upper support body 11 and a second upper support body 12 that are detachably arranged opposite each other along the width direction of the expansion fusion device 100. The lower support body 2 includes a first lower support body 21 and a second lower support body 22 that are detachably arranged opposite each other along the width direction of the expansion fusion device 100. The limiting support body 3 includes a first limiting support body 31 and a second limiting support body 32 that are detachably arranged opposite each other along the width direction of the expansion fusion device 100. The first limiting support body 31 is limited between the first upper support body 11 and the first lower support body 21, and the second limiting support body 32 is limited between the second upper support body 12 and the second lower support body 22. The opening drive structure 4 includes a head opening block 41, a tail opening block 42, and a drive rod 43 that drives the head opening block 41 and the tail opening block 42 to move relative to each other along the length of the opening fusion device 100. The head opening block 41 and the tail opening block 42 are respectively engaged with each opening body to push and cooperate, so as to drive each opening body to open outward along the height direction of the opening fusion device 100 during the relative movement of the head opening block 41 and the tail opening block 42. The head opening block 41 and the tail opening block 42 are respectively engaged with each limiting support body to push and cooperate, so as to drive each limiting support body to open outward along the width direction of the opening fusion device 100 during the relative movement of the head opening block 41 and the tail opening block 42, thereby realizing that each opening body opens outward along the height and width directions of the opening fusion device 100.

[0067] The multi-directional expandable fusion device 100 of this invention, through the mutual cooperation of the limiting support body 3, the head expanding block 41 and the tail expanding block 42, enables the first limiting support body 31 and the second limiting support body 32 to open along the width direction of the expandable fusion device 100. Furthermore, the opening along the width direction of the expandable fusion device 100 is achieved by limiting the first limiting support body 31 and the second limiting support body 32 with the corresponding side upper expanding body 1 and lower expanding body 2.

[0068] Simultaneously, the pushing action of the upper supporting body 1 and the lower supporting body 2 with the head supporting block 41 and the tail supporting block 42 adjusts the distance between the upper supporting body 1 and the lower supporting body 2. In other words, the pushing action between the head supporting block 41 and the tail supporting block 42 and each supporting body adjusts the height of the fusion device 100. Simultaneously, the pushing action between the head supporting block 41 and the tail supporting block 42 and each limiting support adjusts the width direction, and the limiting support 3 pulls the upper and lower supporting bodies 2 corresponding to the width direction of the fusion device 100, causing the upper supporting body 1 and the lower supporting body 2 to slide relative to the head supporting block 41 and the tail supporting block 42 in the width direction of the fusion device 100, thereby simultaneously adjusting the height and width of the fusion device 100. This, in turn, adjusts the contact area of ​​the fusion device 100 in the width direction. Therefore, the multi-directional fusion device 100 has the advantages of increasing bony fusion and ensuring spinal stability.

[0069] Furthermore, the head retractor 41 and tail retractor 42 respectively engage with each limiting support body in a pushing-pushing manner. Their width adjustment trajectory is the movement trajectory of each limiting support body relative to the head retractor 41 and tail retractor 42, and their adjustment range depends on the inclination angle β of the pushing-pushing mating surfaces. The head retractor 41 and tail retractor 42 respectively engage with each retractor body in a pushing-pushing manner. Their height adjustment trajectory is the movement trajectory of each retractor body relative to the head retractor 41 and tail retractor 42, and their adjustment range depends on the inclination angle α of the pushing-pushing mating surfaces. The height and width retractor trajectories are independent and do not interfere with each other. This allows the retractor fusion device 100 to be adjusted in both height and width directions according to requirements, avoiding the problem of limited adjustment range in the width and height directions, thus helping to reduce incision size and improve postoperative wound healing.

[0070] Therefore, the multi-directional expandable fusion unit 100 of the present invention has the advantage of adjustable range in width and height directions.

[0071] It should be noted that each supporting body includes a first upper supporting body 11, a second upper supporting body 12, a first lower supporting body 21, and a second lower supporting body 22. Each limiting support body includes a first limiting support body 31 and a second limiting support body 32. The first upper supporting body 11, the first limiting support body 31, and the first lower supporting body 21 are correspondingly arranged along the height direction of the supporting fusion device 100, and the second upper supporting body 12, the second limiting support body 32, and the second lower supporting body 22 are correspondingly arranged along the height direction of the supporting fusion device 100. Each of the first upper supporting body 11 and the second upper supporting body 12 is pushed and engaged with the upper end face of the head supporting block 41 and the tail supporting block 42, and each of the first lower supporting body 21 and the second lower supporting body 22 is pushed and engaged with the lower end face of the head supporting block 41 and the tail supporting block 42. The first limiting support 31 and the second limiting support 32 are respectively pushed and engaged with the head opening block 41 and the tail opening block 42 on both sides in the width direction. The first limiting support 31 is limited between the first upper opening body 11 and the first lower opening body 21 to allow the first upper opening body 11 and the first lower opening body 21 to move synchronously in the width direction of the opening fusion device 100. The second limiting support 32 is limited between the second upper opening body 12 and the second lower opening body 22, and the second upper opening body 12 and the second lower opening body 22 move synchronously in the width direction of the opening fusion device 100.

[0072] This invention describes how the width of the multi-directional fusion fusion device 100 can be adjusted by the angle of the inclined drive grooves 415 of the upper and lower fusion bodies 1 and 2 with the head fusion block 41 and the tail fusion block 42. This structure allows for multi-directional width variation of the fusion fusion device 100. The height variation can be adjusted by the angle of the vertical inclined drive surfaces 414 of the upper and lower fusion bodies 1 and 2 with the head fusion block 41 and the tail fusion block 42. This structure allows for adjustment of the height variation of the fusion fusion device 100. This structure makes the fusion fusion device 100 suitable for interbody fusion procedures using any approach.

[0073] Optionally, the drive rod 43 can be a screw rod. The screw rod passes through the bone graft channel at the tail of the multi-directional fusion device 100 and connects the head expansion block 41 to the screw rod through a threaded channel.

[0074] In related technologies, such as Figure 19 As shown, with angle γ, at the maximum γ angle, the height can be expanded to its maximum distance, with an expansion of 40%, and the width can also be expanded to its maximum distance, with an expansion of 16%. Because both the height and width are controlled by the inclined rail, when the γ angle decreases, the width increases, but the height decreases, which will not achieve the expected result; when the γ angle increases, the width decreases, the lateral expansion effect is worse, and the height remains unchanged.

[0075] This invention describes a multi-directional expandable fusion device 100. In the width direction, it expands via an inclined drive groove 415, with the expansion range adjustable by angle α. In the height direction, it expands via an inclined drive surface 414, with the expansion range adjustable by angle β. The height and width expansion trajectories are independent and do not interfere with each other. The maximum expansion distance in the height direction is 40%, while the average expansion distance in the width direction is 45°, with an expansion amount of 42%. As angle α increases, the width range can be further increased, with a maximum expansion amount of 52%. This allows for various surgical procedures such as PLIF, TLIF, and OLIF through a small incision.

[0076] like Figures 3 to 6 As shown, the head opening block 41 and the tail opening block 42 have inclined driving surfaces 414 on both sides of the height direction of the opening fusion unit 100. The inclined driving surfaces 414 of the head opening block 41 and the tail opening block 42 are symmetrically arranged along the length direction of the opening fusion unit 100. Each opening body has a mating contact surface 124. Each mating contact surface 124 slides and pushes against each inclined driving surface 414 so that when the head opening block 41 and the tail opening block 42 move, each opening body opens outward along the height direction of the opening fusion unit 100.

[0077] Both the head-opening block 41 and the tail-opening block 42 have one of an inclined drive rail 312 and an inclined drive groove 415 on both sides of the width direction of the opening fusion unit 100. Each limiting support has the other of an inclined drive rail 312 and an inclined drive groove 415 at both ends of the width direction of the opening fusion unit 100. The inclined drive rail 312 is relatively slidably disposed within the inclined drive groove 415, so that when the head-opening block 41 and the tail-opening block 42 move relative to each other, each opening body opens outward along the width direction of the opening fusion unit 100, thereby driving each limiting support to move in the width direction and causing each opening body to open outward along the width of the opening fusion unit 100. It is understood that the head-opening block 41 and the tail-opening block 42 have relatively independent inclined drive surfaces 414 in both the height and width directions. Therefore, the movement trajectories of each limiting support and each opening body do not interfere with each other.

[0078] The multi-directional expandable fusion device 100 of this embodiment of the invention uses inclined surfaces for the areas where each of the head expandable block 41 and the tail expandable block 42 engages with each expandable body and each limiting support body. This results in point-to-surface contact and a sliding contact between surfaces, leading to a relatively large contact area and improving the stability of their movement. Furthermore, it helps to increase the range of dimensional variation during expansion. For example, in the height direction, the maximum range is the sum of the thicknesses of the head expandable block 41 and / or the tail expandable block 42, the upper expandable body 1, and the lower expandable body 2. In the width direction, the maximum range is the sum of the widths of the head expandable block 41 and / or the tail expandable block 42, the upper expandable body 1, and the lower expandable body 2.

[0079] like Figures 3 to 5 As shown, each limiting support has one of a vertical beam 300 and a vertical sliding groove 120, and each expansion body has the other of a vertical beam 300 and a vertical sliding groove 120. The vertical beam 300 can slide relative to the vertical sliding groove 120 to synchronize the width direction movement of the upper expansion body 1, the limiting support body 3, and the lower expansion body 2. It can be understood that each limiting support has a vertical beam 300 and each expansion body has a vertical sliding groove 120; or each limiting support has a vertical sliding groove 120 and each expansion body has a vertical beam 300.

[0080] The multi-directional expandable fusion device 100 of this invention uses vertical beams 300 and vertical sliding grooves 120 to limit the movement of each limiting support and each expanding body on the same side of the width direction. The vertical beams 300 are slidably inserted into the vertical sliding grooves 120. This not only ensures uninterrupted movement in both the height and width directions but also provides limiting during sliding, resulting in a relatively simple structure. This helps improve the stability of the expandable fusion device 100. Furthermore, after the expandable fusion device 100 is expanded to the desired height, the vertical beams 300 and vertical sliding grooves 120 remain in contact, providing strength support and improving the overall mechanical properties of the expandable fusion device 100. It exhibits high strength under shear force, good expansion stability, and the ability to effectively restore vertebral height and tension, thus ensuring spinal stability.

[0081] For example, the first limiting support 31 has vertical beams 300 in both the vertical and horizontal directions (in the height direction of the fusion unit 100), and the first upper supporting body 11 and the first lower supporting body 21 have vertical sliding grooves 120 extending in the vertical and horizontal directions in the areas corresponding to the vertical beams 300. The second limiting support 32 has vertical beams 300 in both the vertical and horizontal directions (in the height direction of the fusion unit 100), and the second upper supporting body 12 and the second lower supporting body 22 have vertical sliding grooves 120 extending in the vertical and horizontal directions in the areas corresponding to the vertical beams 300.

[0082] like Figure 6 , Figures 11 to 14 As shown, the head opening block 41 and the tail opening block 42 include an opening block body 401, a connecting part 402 and an inclined plate body 403. An inclined driving surface 414 is formed on the inclined plate body 403. The opening block body 401 and the inclined plate body 403 are connected by the connecting part 402. The opening block body 401 has an inclined surface parallel to the inclined driving surface 414. A first limiting groove 412 is formed between the opening block body 401 and the inclined plate body 403. A first limiting protrusion 413 is formed on the inclined plate body 403.

[0083] Each supporting body is provided with a second limiting groove 122. The end of each supporting body forms a second limiting protrusion 123 with the side wall of the second limiting groove 122. The first limiting protrusion 413 is slidably inserted through the second limiting groove 122. The second limiting protrusion 123 is slidably inserted within the first limiting groove 412. The side wall of the second limiting groove 122 slides against the inclined driving surface 414 so that when the head supporting block 41 and the tail supporting block 42 move, each supporting body opens outward along the height and width direction of the supporting fusion device 100.

[0084] The multi-directional expandable fusion device 100 of this invention forms a first limiting groove 412, a first limiting protrusion 413, and an inclined driving surface 414 on the structure of the head expanding block 41 and the tail expanding block 42, and each expanding body is provided with a second limiting groove 122 and a second limiting protrusion 123. The first limiting protrusion 413 is slidably inserted through the second limiting groove 122, and the second limiting protrusion 123 is slidably inserted within the first limiting groove 412. The sidewall of the second limiting groove 122 slides against the inclined driving surface 414 so that, while pushing and engaging, multiple parts are limited, thereby improving the stability and pressure-bearing capacity of the structure.

[0085] like Figure 6 , Figures 11 to 14 As shown, the first limiting slide groove 412 and the second limiting slide groove 122 are open in the height direction of the expanding fusion unit 100, and the openings of the first limiting slide groove 412 and the first limiting slide groove 412 are arranged facing one side of the width direction of the expanding fusion unit 100.

[0086] The multi-directional expandable fusion connector 100 of this invention opens the first limiting groove 412 and the second limiting groove 122 in the height direction of the expandable fusion connector 100, so that the sliding of each expandable body relative to the inclined panel 403 is not affected by the contour of the first limiting groove 412. Therefore, the expandable fusion connector 100 further avoids the problem of limited adjustment range in the width and height directions of the fusion connector.

[0087] like Figure 11 and Figure 14As shown, both the tilting drive rail 312 and the tilting drive groove 415 are dovetail-shaped. This structure has the advantage of a stable connection.

[0088] The angle between the tilting drive groove 415 and the width direction of the expansion fusion unit 100 is α35-55 degrees. This satisfies the need for adjustment of the width direction of the expansion fusion unit 100 while offering advantages such as relatively low resistance and reduced operational difficulty during adjustment.

[0089] Optionally, such as Figure 9 As shown, the included angle α between the inclined drive groove 415 and the width direction of the expanding fusion device 100 can be 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54° or 55°.

[0090] The angle β between the tilting drive surface 414 and the length direction of the expansion fusion unit 100 is 40°-50°. This satisfies the need for height adjustment of the expansion fusion unit 100 while offering advantages such as relatively low resistance and reduced operational difficulty during adjustment.

[0091] Optionally, such as Figure 10 As shown, the angle between the inclined driving surface 414 and the length direction of the expansion fusion device 100 is β40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49° or 50°.

[0092] like Figures 4 to 6 and Figure 18 As shown, the tail expansion block 42 includes a front drive ring body 423, a tail expansion block 424, and a pair of lateral connecting arms 425 connecting the front drive ring body 423 and the tail expansion block 424. The internal cavity enclosed by the tail expansion block 42 is used as a bone graft cavity. The tail of the drive rod 43 is located on the front drive ring body 423. The tail expansion block 424 is provided with an insertion opening that communicates with the bone graft cavity for the insertion of operating instruments.

[0093] The multi-directional expandable fusion device 100 of this invention, after being implanted and expanded in the human body, still has a bone graft cavity inside. Bone filler materials such as bone paste, bone blocks, and bone powder can be inserted into this cavity using instruments through the insertion opening. This fully utilizes the increased bone graft space created by the expanded fusion device, allowing for ample bone grafting within the device, improving the bone graft fusion effect, facilitating subsequent bone fusion, and resulting in good device fixation and increased bone fusion, meeting clinical requirements. Therefore, this expandable fusion device 100 has the advantages of good bone grafting effect and high bone fusion rate.

[0094] This invention is mainly applicable to posterior spinal fusion and fixation surgery, especially lumbar intervertebral fusion and fixation surgery. Specifically, it is a bidirectional expandable fusion device 100 with a large bone graft cavity at the tail end, which can adjust the fusion device to the optimal position for intervertebral correction, thereby improving the stability, fixation and fusion of the fusion device.

[0095] The multi-directional expandable fusion device 100 of the present invention has a large bone graft channel (insertion opening), which can not only implant bone paste but also implant large-volume bone blocks. The bone fusion rate is much higher than that of existing products, and there is sufficient bone graft cavity to implant a large amount of bone paste or bone blocks, which increases the bone fusion effect of the fusion device.

[0096] like Figure 1 , Figure 2 and Figure 15 As shown, the first upper support body 11, the second upper support body 12, the first lower support body 21, and the second lower support body 22 each have a receiving groove 125 on the side of the fusion device 100 closer to the interior in the width direction. The multiple receiving grooves 125 form receiving cavities. When the fusion device 100 is in the closed state, the first limiting support body 31 and the second limiting support body 32 are disposed in the receiving cavities. The first upper support body 11 and the first lower support body 21, the second upper support body 12 and the second lower support body 22 are all in close contact. The upper support body 1, the lower support body 2, each limiting support body 3, the head opening block 41 and the tail opening block 42 together form a sealed whole.

[0097] like Figure 3 As shown, when the fusion device 100 is in the expanded state, the first upper expanding body 11, the second upper expanding body 12, the first lower expanding body 21, the second lower expanding body 22, the first limiting support body 31 and the second limiting support body 32 gradually separate, and an overflow gap is formed between the first upper expanding body 11 and the second upper expanding body 12, and between the first lower expanding body 21 and the second lower expanding body 22.

[0098] The multi-directional expandable fusion device 100 of the present invention comprises a sealed whole composed of various expanders, limiting supports, a head expander 41, and a tail expander 42, with the limiting supports concealed within the accommodating cavity formed by the upper expander 1 and the lower expander 2. This not only ensures good structural integrity but also helps to reduce the volume of the expandable fusion device 100. This facilitates the implantation of the expandable fusion device 100 into the human body in the closed state. Furthermore, overflow gaps are formed between the first upper expander 11 and the second upper expander 12, and between the first lower expander 21 and the second lower expander 22. These overflow gaps expand continuously as the height and width of the fusion device increase, increasing bone sludge overflow and improving the bone fusion rate.

[0099] Optionally, each expander is provided with an overflow hole 121. When the expander fusion device 100 is expanded in width, the bone graft window at the middle position of the expander fusion device 100 gradually increases with the increase in width. At the same time, with the increase in height, the overflow holes 121 located on the side walls will first be exposed and then gradually increase in size. This structural feature increases the bone graft overflow effect of the implant. As a result, the fusion effect between the first limiting support 31 and the second limiting support 32 and the upper and lower vertebral bodies can be improved, increasing bone graft overflow and improving the bone fusion rate.

[0100] like Figures 4 to 6 As shown, the head expansion block 41 has a first drive rod 43 mounting hole 411, and the front drive ring body 423 of the tail expansion block 42 has a second drive rod 43 mounting hole 421. The head of the drive rod 43 is threadedly connected to the first drive rod 43 mounting hole 411, and the tail of the drive rod 43 is axially fixed and circumferentially rotatable connected to the second drive rod 43 mounting hole 421. The middle part of the drive rod 43 has an annular groove, and a retaining ring 5 is provided in the annular groove to stop and cooperate with the front end face of the front drive ring body 423. It can be understood that when the drive rod 43 is about to disengage from the threaded hole, the retaining ring 5 can cooperate with the drive rod 43 to prevent the drive rod 43 from continuing to move in the direction of disengaging from the threaded hole, thereby improving the reliability of the expansion fusion device 100 during use.

[0101] Optionally, the mounting holes 411 and 421 of the first drive rod 43 and the bone graft hole are aligned on the same straight line.

[0102] Optionally, a holding groove 422 or holding protrusion provided on the rear side of the supporting block 401 of the tail supporting block 42 facilitates the positioning of the supporting block 401 by the implanter. Therefore, when the driving member moves along the front-rear direction of the supporting fusion device 100, relative movement between the upper supporting body 1 and the lower supporting body 2 can be avoided. This improves the reliability of the supporting fusion device 100 structure.

[0103] like Figures 1 to 6 As shown, at least one of the first upper stabilizing body 11, the second upper stabilizing body 12, the first lower stabilizing body 21, and the second lower stabilizing body 22 is a porous structure with porous structural areas on both sides. This improves the fusion effect between each stabilizing body and the upper and lower vertebral bodies, thus enhancing the stability of the fusion device 100 after implantation.

[0104] Each of the expansion bodies is a 3D printed part. Thus, each expansion body can be printed with different models and specifications of the first upper expansion body 11, the second upper expansion body 12, the first lower expansion body 21, and the second lower expansion body 22 according to the actual needs of different patients, and toothed bodies with corresponding height and angle can be designed to help perfectly fit the patient's intervertebral space and enhance the self-stabilizing performance of the implant.

[0105] Optionally, multiple materials can be selected for 3D printing, such as titanium alloys, tantalum, niobium, zirconium, etc.

[0106] Each distractor's outer surface is coated with a hydroxyapatite layer, perfectly fitting the patient's intervertebral space and enhancing the fusion cage's self-stabilizing performance. The outer surface of each distractor can also be coated with a hydroxyapatite layer to further improve bone fusion.

[0107] The intervertebral implantation system of this invention includes an implanter and a multidirectionally expandable fusion device 100 as described above. The implanter is connected to the expansion drive structure 4. The implanter adjusts the relative positions of the head expansion block 41 and the tail expansion block 42 through the drive rod 43, so that the expansion fusion device 100 can be transformed between the closed state and the expanded state by the head expansion block 41 and the tail expansion block 42 pushing and cooperating with each expansion body and the limiting support body 3 respectively.

[0108] Therefore, the intervertebral implantation system of this invention has the advantage of adjustable range in both width and height.

[0109] During the procedure, the retrieval device clamps the tail-end expansion block 42 through its slot and inserts it into the intervertebral disc. Imaging equipment is used to observe the implant's position within the disc. The surgeon rotates the drive rod 43 using a wrench (implant), moving the head expansion block 41 towards the center via the threaded connection between the drive rod 43 and the head expansion block 41. The tail-end expansion block 42, being clamped, remains in its fixed position. The first and second limiting supports 31 and 32 expand outwards due to the inclined drive groove 415. Simultaneously, the upper and lower expansion bodies 1 and 2 expand along the height direction in conjunction with the inclined drive surface 414 of the head expansion block 41. Furthermore, the upper and lower expansion bodies 1 and 2, in conjunction with the vertical beams 300 of the first and second limiting supports 31 and 32, cause their toothed bodies to expand simultaneously in both height and width directions. After confirming the position, the retrieval device and the accompanying wrench are removed sequentially.

[0110] In the description of this invention, 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," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0111] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0112] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0113] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0114] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0115] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-directional expandable fusion device, characterized in that, The expanding fusion device has a convertible closing state and an expanding state, and the expanding fusion device includes: The upper support body and the lower support body are detachably arranged opposite each other along the height direction of the expansion fusion device. The upper support body includes a first upper support body and a second upper support body that are detachably arranged opposite each other along the width direction of the expansion fusion device. The lower support body includes a first lower support body and a second lower support body that are detachably arranged opposite each other along the width direction of the expansion fusion device. The limiting support body includes a first limiting support body and a second limiting support body that are disposed opposite to each other and separable along the width direction of the expanding fusion body. The first limiting support body is limited between the first upper expanding body and the first lower expanding body, and the second limiting support body is limited between the second upper expanding body and the second lower expanding body. The expansion drive structure includes a head expansion block, a tail expansion block, and a drive rod that drives the head expansion block and the tail expansion block to move relative to each other along the length direction of the expansion fusion unit. The head expansion block and the tail expansion block are respectively engaged with each expansion body in a pushing-pushing manner. During the relative movement of the head expansion block and the tail expansion block, each expansion body is driven to open outward along the height direction of the expansion fusion unit. The head expansion block and the tail expansion block are respectively engaged with each limiting support body in a pushing-pushing manner, so as to drive each limiting support body to open outward along the width direction of the expansion fusion unit during the relative movement of the head expansion block and the tail expansion block, thereby realizing that each expansion body opens outward along the height and width directions of the expansion fusion unit.

2. The multi-directional expandable fusion device according to claim 1, characterized in that, The head opening block and the tail opening block each have an inclined driving surface on both sides of the opening fusion device in the height direction. The inclined driving surfaces of the head opening block and the tail opening block are symmetrically arranged along the length direction of the opening fusion device. Each opening body has a mating contact surface. Each mating contact surface slides and pushes against each inclined driving surface so that when the head opening block and the tail opening block move, each opening body opens outward along the height direction of the opening fusion device. The head opening block and the tail opening block each have one of an inclined drive rail and an inclined drive groove on both sides of the opening fusion device in the width direction. Each limiting support has the other of the inclined drive rail and the inclined drive groove at both ends of the opening fusion device in the width direction. The inclined drive rail can be slidably disposed in the inclined drive groove so that when the head opening block and the tail opening block move relative to each other, each opening body opens outward along the width direction of the opening fusion device. This is achieved by driving each limiting support to move in the width direction, thereby causing each opening body to open outward along the width of the opening fusion device.

3. The multi-directional expandable fusion device according to claim 2, characterized in that, Each limiting support has one of a vertical beam and a vertical sliding groove, and each expansion body has the other of the vertical beam and the vertical sliding groove. The vertical beam can slide relative to each other through the vertical sliding groove so that the upper expansion body, the limiting support body and the lower expansion body move synchronously in the width direction.

4. The multi-directional expandable fusion device according to claim 2, characterized in that, The head opening block and the tail opening block each include an opening block body, a connecting part, and an inclined plate body. The inclined plate body forms the inclined driving surface. The opening block body and the inclined plate body are connected through the connecting part. The opening block body has an inclined surface parallel to the inclined driving surface. A first limiting groove is formed between the opening block body and the inclined plate body. The inclined plate body forms a first limiting protrusion. Each supporting body is provided with a second limiting groove, and the end of each supporting body forms a second limiting protrusion with the side wall of the second limiting groove. The first limiting protrusion is slidably inserted into the second limiting groove, and the second limiting protrusion is slidably inserted into the first limiting groove. The side wall of the second limiting groove slides against the inclined driving surface so that when the head supporting block and the tail supporting block move, each supporting body opens outward along the height and width directions of the supporting fusion device.

5. The multidirectional expandable fusion device according to claim 4, characterized in that, The first limiting slide and the second limiting slide are open in the height direction of the expanding fusion unit, and the openings of the first limiting slide and the second limiting slide are arranged facing one side of the width direction of the expanding fusion unit.

6. The multidirectional expandable fusion device according to claim 2, characterized in that, Both the inclined drive rail and the inclined drive groove are dovetail-shaped. And / or, when viewed from the height direction of the expanding fusion unit, the inclined drive groove shows an outward expansion trend; when viewed from the length direction of the expanding fusion unit, the inclined drive groove is a long groove extending along the length direction of the expanding fusion unit; and the angle α between the inclined drive groove and the width direction of the expanding fusion unit is 35-55 degrees. And / or, the angle β between the inclined driving surface and the length direction of the spreading fusion device is 40-50 degrees.

7. The multidirectional expandable fusion device according to claim 1, characterized in that, The first upper support body, the second upper support body, the first lower support body, and the second lower support body each have a receiving groove on the side of the opening fusion device closer to the inside in the width direction. There are multiple receiving groove-shaped receiving cavities. When the opening fusion device is in the closed state, the first limiting support body and the second limiting support body are disposed in the receiving cavity. The first upper support body and the first lower support body, the second upper support body and the second lower support body are all in close contact. Each support body, each limiting support body, the head opening block and the tail opening block together form a sealed whole. When the expansion fusion device is in the expanded state, the first upper expansion body, the second upper expansion body, the first lower expansion body, the second lower expansion body, the first limiting support body, and the second limiting support body gradually separate, and an overflow gap is formed between the first upper expansion body and the second upper expansion body, and between the first lower expansion body and the second lower expansion body.

8. The multi-directional expandable fusion device according to claim 7, characterized in that, The tail expansion block includes a front drive ring body, a tail expansion block, and a pair of lateral connecting arms connecting the front drive ring body and the tail expansion block. The internal cavity enclosed by the tail expansion block is used as a bone graft cavity. The bone graft cavity is connected to the receiving cavity. The tail of the drive rod is located on the front drive ring body. The tail expansion block is provided with an insertion opening that communicates with the bone graft cavity for the insertion of operating instruments.

9. The multidirectional expandable fusion device according to claim 1, characterized in that, The head expansion block is provided with a first drive rod mounting hole, and the front drive ring of the tail expansion block is provided with a second drive rod mounting hole. The head of the drive rod is threadedly connected to the first drive rod mounting hole, and the tail of the drive rod is axially fixed and circumferentially rotatable connected to the second drive rod mounting hole. The middle part of the drive rod is provided with an annular groove, and a retaining ring that stops and cooperates with the front end face of the front drive ring is provided in the annular groove. And / or, the front end of the head expansion block is pointed, and the rear end of the tail expansion block has a holding groove or a holding protrusion. And / or, at least one of the first upper support body, the second upper support body, the first lower support body and the second lower support body is a porous structure with porous structure areas on both sides; And / or, each support body is a 3D printed part; And / or, the outer surface of each support is coated with a hydroxyapatite coating.

10. An intervertebral disc implantation system, characterized in that, The device includes an implant and a multidirectional expandable fusion device according to any one of claims 1-9, wherein the implant is connected to the expandable driving structure, and the implant adjusts the relative position of the head expandable block and the tail expandable block by a drive rod, so that the expandable fusion device can be transformed between the closed state and the expanded state by the head expandable block and the tail expandable block moving in conjunction with each expandable body and the limiting support body respectively.

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