Anti-retrograde interbody fusion device

Abstract

This invention discloses an anti-retrograde interbody fusion device, comprising a main body, a positioning element, and a pushing element. The surface of the main body has a raised or porous structure. The positioning element is disposed on the main body and is movable relative to the main body along the thickness direction of the main body between a first position and a second position. In the first position, the positioning element is located inside the main body; in the second position, at least a portion of the positioning element protrudes from the main body. The pushing element is movably assembled to the rear end of the main body in a front-rear direction. The pushing element is U-shaped, and its two side arms cooperate with the positioning element to push and drive the positioning element from the first position to the second position during front-rear movement. The anti-retrograde interbody fusion device of this invention has good implantation stability, is easy to adjust, and has a simple assembly process.

Description

Technical Field

[0001] This invention relates to the technical field of medical devices, and more specifically, to an anti-regression interbody fusion device. Background Technology

[0002] Spinal fusion surgery is an effective treatment for spinal degeneration and instability. It fuses upper and lower vertebrae, maintaining intervertebral disc height, restoring physiological lordosis, reducing nerve root pressure, and maintaining spinal stability. Clinical outcomes are satisfactory, the surgery is minimally invasive, and the procedure is convenient. However, among related techniques, intervertebral fusion cages have poor stability after implantation, are difficult to adjust, and have less desirable surgical outcomes. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an anti-retrograde interbody fusion device that addresses the defects and deficiencies of the prior art. This anti-retrograde interbody fusion device has good implantation stability, is easy to adjust, and is simple to assemble.

[0004] The anti-regression interbody fusion device of this invention includes: a main body, the surface of which has a toothed or porous structure; a positioning member disposed on the main body, and the positioning member is movable relative to the main body along the thickness direction of the main body between a first position and a second position. In the first position, the positioning member is located inside the main body, and in the second position, at least a portion of the positioning member protrudes from the main body; and a pushing member movably mounted on the rear end of the main body in a front-rear direction. The pushing member is U-shaped, and the pushing member pushes against the positioning member to drive the positioning member to move from the first position to the second position during front-rear movement.

[0005] In the embodiment of the present invention, the anti-retrograde interbody fusion device has a pushing member that can move along the main body to push the positioning member out of the main body. Therefore, after the anti-retrograde interbody fusion device is assembled in place, the position of the pushing member can be adjusted to make the positioning member protrude from the main body, thereby achieving the positioning and anti-dislodgement of the anti-retrograde interbody fusion device. After initial assembly or implantation into the intervertebral disc, the pushing member can be adjusted to the withdrawal position to pull the anti-retrograde interbody fusion device backward. The pressure of the upper and lower endplates can be used to make the positioning member retract on its own, which can improve the implantation stability of the anti-retrograde interbody fusion device and facilitate operation.

[0006] In some embodiments, the jacking mating surface between the positioning member and the pushing member is an inclined surface.

[0007] In some embodiments, the rear of the main body is provided with a mounting groove for embedding and installing a pusher. The positioning member includes a first positioning member located above the main body on one side in the left-right direction, and a second positioning member located below the main body on the other side in the left-right direction. The two arms of the pusher include a first side arm and a second side arm. The upper end surface of the first side arm is an inclined surface that pushes and cooperates with the first positioning member, and the lower end surface of the second side arm is an inclined surface that pushes and cooperates with the second positioning member.

[0008] In some embodiments, the lower end face of the first side arm is a plane that guides and engages with the bottom wall of the mounting groove, and the upper end face of the second side arm is a plane that guides and engages with the top wall of the mounting groove.

[0009] In some embodiments, an anti-detachment structure is provided between the pusher and the body to prevent the pusher from falling off.

[0010] In some embodiments, at least one side arm of the pusher has a guide groove extending forward and backward on one of the mating surfaces opposite to the mounting groove, and a guide block is provided on the other side arm. A partition is provided on the guide path of the guide groove, and the guide block is fitted within the guide groove.

[0011] In some embodiments, the front side of the partition is connected to the bottom inclined surface of the guide groove.

[0012] In some embodiments, both sides of the pusher are provided with the guide groove or the guide block, and the guide groove or the guide block provided on the two sides are staggered in the vertical direction.

[0013] In some embodiments, a drive member is further included, which is mounted on the main body and is throttle-connected to the push member to drive the push member to move back and forth; the drive member is a threaded connector, which is threadedly connected to the main body, and the push member is sleeved on the threaded connector, which can be screwed to drive the push member to move along the length direction of the main body.

[0014] In some embodiments, the positioning member is a positioning piece extending forward and backward, the top of the positioning piece being a ridge shape with a high center and low sides; and / or, the main body is a frame structure with a bone graft window extending vertically, the two arms of the pusher being located on the left and right sides of the bone graft window respectively, and overlapping the bone graft window in the forward and backward direction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the anti-retrograde interbody fusion device according to an embodiment of the present invention.

[0016] Figure 2This is a transverse sectional view of the anti-retrograde interbody fusion device according to an embodiment of the present invention.

[0017] Figure 3 This is a longitudinal sectional view of the anti-retrograde interbody fusion device according to an embodiment of the present invention.

[0018] Figure 4 This is an exploded view of the anti-retrograde interbody fusion device according to an embodiment of the present invention.

[0019] Figure label:

[0020] Main body 1, mounting hole 11, threaded hole 12, guide block 13, hollow bone graft cavity 14, mounting groove 15, positioning component 2, limiting protrusion 21, threaded connector 3, pusher 4, guide groove 41, partition 42, top cap assembly cavity 43, first side arm 44, second side arm 45, partition 46. Detailed Implementation

[0021] 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.

[0022] like Figures 1-4 As shown, the anti-regression interbody fusion device of this invention includes a main body 1, a positioning component 2, and a pushing component 4.

[0023] Specifically, such as Figure 1 As shown, the main body 1 is a frame-like structure with a bone graft window 14 running vertically through it. Preferably, the inner wall of the bone graft window 14 is a mesh structure, which is beneficial for promoting bone ingrowth and fixation.

[0024] like Figures 1-4 The positioning member 2 is disposed on the main body 1, and the positioning member 2 is movable relative to the main body 1 along the thickness direction of the main body 1 between a first position and a second position. In the first position, the positioning member 2 is located inside the main body 1, and in the second position, at least a portion of the positioning member 2 protrudes from the main body 1.

[0025] It should be noted that the interbody fusion cages in related technologies have a toothed surface for fixation and anti-dislodgement. However, the toothed structure only provides anti-dislodgement in the longitudinal direction (access). To ensure that the interbody fusion cage does not wobble or loosen after assembly, the positioning element 2 in this application can serve to firmly fix the interbody fusion cage to the vertebrae on both sides. Specifically, during initial assembly, the positioning element 2 is in the first position, i.e., the positioning element 2 is in a retracted state to avoid assembly interference. After assembly, the positioning element 2 is moved to the second position, i.e., the positioning element 2 is in an extended state, thereby fixing the interbody fusion cage to the spine and preventing it from falling off.

[0026] Specifically, the pusher 4 is U-shaped and movably mounted on the rear end of the main body 1 in the front-back direction. The two arms of the pusher 4 cooperate with the positioning member 2 to push and drive the positioning member 2 to move from the first position to the second position during the front-back movement.

[0027] Optionally, the two arms of the pusher 4 are located on the left and right sides of the bone graft window 14, respectively, and overlap with the bone graft window 14 in the front-back direction. Preferably, the surface of the main body 1 has serrated or porous interfaces to further improve the reliability of anti-retraction.

[0028] In the embodiment of the present invention, the anti-retrograde interbody fusion device has a pushing member that can move along the main body to push the positioning member out of the main body. Therefore, after the anti-retrograde interbody fusion device is assembled in place, the position of the pushing member can be adjusted to make the positioning member protrude from the main body, thereby achieving the positioning and anti-dislodgement of the anti-retrograde interbody fusion device. After initial assembly or implantation into the intervertebral disc, the pushing member can be adjusted to the withdrawal position to pull the anti-retrograde interbody fusion device backward. The pressure of the upper and lower endplates can be used to make the positioning member retract on its own, which can improve the implantation stability of the anti-retrograde interbody fusion device and facilitate operation.

[0029] Preferably, the pushing mating surface between the positioning member 2 and the pushing member 4 is an inclined surface. Therefore, as the pushing member 4 moves forward, the positioning member 2 can gradually extend.

[0030] Preferably, such as Figure 3 and Figure 4 As shown, the end of the positioning block located in the mounting groove 15 is provided with a limiting protrusion 21, which can stop against the top wall of the mounting groove 15. Thus, the limiting protrusion 21 can prevent the positioning member 2 from falling out of the mounting hole 11 when the positioning member 2 is pushed out.

[0031] Furthermore, such as Figure 4 As shown, the rear of the main body 1 is provided with a mounting groove for the pusher 4 to be embedded and installed. The positioning components include a first positioning component located above the main body 1 on one side in the left-right direction, and a second positioning component located below the main body 1 on the other side in the left-right direction. The two arms of the pusher 4 include a first side arm 44 and a second side arm 45. The upper end surface of the first side arm 44 is an inclined surface that pushes against the first positioning component, and the lower end surface of the second side arm 45 is an inclined surface that pushes against the second positioning component. Preferably, it should also be noted that the shape of the pusher 4 matches the mounting groove 15 to avoid movement interference.

[0032] In other words, the first positioning member and the second positioning member are located on the left and right sides of the main body 1, respectively, and the two positioning members are located above and below the main body 1 in the vertical direction. Correspondingly, the two arms of the push member 4 are respectively engaged with the two positioning members, and the engagement surface between the side arm and the corresponding positioning member is an inclined surface.

[0033] Furthermore, such as Figure 4As shown, the lower end face of the first side arm 44 is a plane that guides and mates with the bottom wall of the mounting groove, and the upper end face of the second side arm 45 is a plane that guides and mates with the top wall of the mounting groove. Therefore, the pusher 4 can move back and forth along the side arms of the mounting groove, and the engagement of the lower end face of the first side wall 44 with the bottom wall of the mounting groove and the engagement of the upper end face of the second side arm 45 with the top wall of the mounting groove can hold the pusher 4 within the mounting groove, preventing it from shaking.

[0034] Furthermore, an anti-detachment structure is provided between the pusher 4 and the main body 1 to prevent the pusher from falling off.

[0035] Specifically, such as Figure 4 As shown, at least one side arm of the pusher 4 has a guide groove 41 extending forward and backward on one of its mating surfaces opposite the mounting groove, and a guide block 13 is provided on the other side arm. A partition 46 is provided on the guide path of the guide groove 41, and the guide block 13 is fitted within the guide groove 41. Thus, the cooperation between the guide block 13 and the guide groove 41 can guide and limit the movement of the pusher 4.

[0036] Preferably, such as Figure 4 As shown, the front side of the partition 46 is connected to the bottom inclined surface of the guide groove 41. Therefore, when the pusher 4 is assembled, the guide block 13 can pass over the partition 46 along the inclined surface and fit into the guide groove 41 on the rear side of the partition 46. It should be noted that the guide block 13 has a certain degree of deformability, so that when the guide block 13 moves to the partition 46, it can deform to pass over the partition 46. When the pusher 4 is retracted to the limit position, the partition 46 can stop the guide block to prevent the pusher 4 from falling out of the mounting groove 15.

[0037] Preferably, such as Figure 4 As shown, both sides of the pusher are provided with guide grooves or guide blocks, and the guide grooves or guide blocks on both sides are staggered in the vertical direction. Therefore, a guide structure is provided between both sides of the pusher and the mounting part, resulting in good guiding effect and high reliability in preventing detachment.

[0038] In some embodiments, the anti-retrograde interbody fusion device further includes a drive member, which is mounted on the main body 1 and is connected to the pusher 4 in a transmission manner to drive the pusher 4 to move back and forth.

[0039] Optionally, the driving component is a threaded connector 3, which is threadedly connected to the main body 1. The pushing component 4 is sleeved on the threaded connector 3, and the threaded connector 3 can be screwed to drive the pushing component 4 to move along the length direction of the main body 1.

[0040] Therefore, the screwing of the threaded connector 3 drives the pusher 4 to move. The movement stroke of the pusher 4 can be adjusted according to the needs (the movement stroke of the pusher 4 is different depending on the screwing depth). This allows the pusher 4 to push the positioning part 2 to protrude to the preset position. After the screwing stops, the threaded connector 3 can remain relatively stationary with the main body 1. Thus, both the pusher 4 and the positioning part 2 stay in the corresponding positions, achieving stable assembly of the anti-retrograde intervertebral fusion device. In other words, the protrusion stroke of the positioning part 2 is adjustable, which is highly versatile and simple and efficient to operate.

[0041] Specifically, the threaded connector, the screw pusher 4, has a cap assembly cavity 43. The cap of the screw fits into the cap assembly cavity 43, and the inner wall of the cap assembly cavity 43 is provided with an anti-return ring. The anti-return ring can hold the top surface of the cap to prevent the pusher 4 from moving relative to the screw in the length direction of the screw. Thus, the anti-return ring can ensure that the pusher 4 moves synchronously with the screw as it is screwed in, and prevent the screw from falling off the pusher 4 when it is screwed out.

[0042] In some embodiments, the positioning element 2 is a positioning piece that extends forward and backward, and the top of the positioning piece is ridge-shaped with a high center and low sides.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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 type of anti-regression interbody fusion device, characterized in that, include: The main body has a toothed or porous structure on its surface; A positioning element is disposed on the body and is movable relative to the body along the thickness direction of the body between a first position and a second position. In the first position, the positioning element is located inside the body, and in the second position, at least a portion of the positioning element protrudes from the body. A pusher is movably mounted at the rear end of the main body in the front-back direction. The pusher is U-shaped. The two arms of the pusher are pushed and engaged with the positioning member to drive the positioning member from the first position to the second position during the front-back movement. The pushing and engaging surfaces of the positioning member and the pusher are inclined surfaces. An anti-detachment structure is provided between the pusher and the main body to prevent the pusher from falling off. The rear of the main body is provided with a mounting groove for embedding and installing a pusher. At least one side arm of the pusher has a guide groove extending forward and backward on one of its mating surfaces opposite to the mounting groove, and a guide block is provided on the other side. A partition is provided on the guide path of the guide groove. The guide block fits in the guide groove. The guide block has a certain degree of deformability. The guide block can cross the partition along the inclined surface and fit in the guide groove on the rear side of the partition. The end of the positioning member located in the mounting groove is provided with a limiting protrusion. The limiting protrusion can stop against the top wall or bottom wall of the mounting groove. The positioning component includes a first positioning component located above the main body and disposed on one side in the left-right direction, and a second positioning component located below the main body and disposed on the other side in the left-right direction. The two arms of the pusher include a first side arm and a second side arm. The upper end surface of the first side arm is an inclined surface that pushes and cooperates with the first positioning component, and the lower end surface of the second side arm is an inclined surface that pushes and cooperates with the second positioning component. A driving component, which is mounted on the main body and is connected in a transmission manner to the pushing component to drive the pushing component to move back and forth; The driving component is a threaded connector, which is threadedly connected to the main body. The pushing component is sleeved on the threaded connector, and the threaded connector can be screwed to drive the pushing component to move along the length direction of the main body.

2. The anti-retrograde interbody fusion device according to claim 1, characterized in that, The lower end face of the first side arm is a plane that guides and engages with the bottom wall of the mounting groove, and the upper end face of the second side arm is a plane that guides and engages with the top wall of the mounting groove.

3. The anti-retrograde interbody fusion device according to claim 1, characterized in that, The front side of the partition is connected to the bottom slope of the guide groove.

4. The anti-retrograde interbody fusion device according to claim 1, characterized in that, Both sides of the pusher are provided with the guide groove or the guide block, and the guide groove or the guide block provided on the two sides are staggered in the vertical direction.

5. The anti-retrograde interbody fusion device according to claim 1, characterized in that: The positioning element is a positioning piece that extends forward and backward, and the top of the positioning piece is ridge-shaped with a high middle and low sides. And / or, the main body is a frame-like structure with a bone graft window running vertically through it, and the two arms of the pusher are located on the left and right sides of the bone graft window respectively, and overlap with the bone graft window in the front-back direction.

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