A highly stable anterior cervical interbody fusion cage with coating

Abstract

The utility model belongs to the technical field of medical devices, and specifically relates to a high-stability anterior cervical intervertebral fusion device with a coating, which includes a fusion body, a cover plate, a backstop plate and a bone screw, wherein the backstop plate is threadedly connected to a rotating column, a sliding block is provided on the rotating column, a locking groove is provided on the sliding block, a vertical groove and a horizontal groove are respectively provided on the cover plate, a sliding groove is provided in the horizontal groove, and the rotating column and the sliding groove are slidably matched. In the locked state, the backstop plate is in a horizontal state and is located in the horizontal groove. When the bone screw is loose, the bone screw is in an inclined state after installation, and the head of the bone screw will press against the backstop plate and drive the backstop plate to rotate. Since the backstop plate is located in the horizontal groove, the horizontal groove can limit the rotation of the backstop plate, and can effectively abut against the bone screw to prevent the bone screw from loosening and shifting.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a high-stability anterior cervical vertebrae fixation intervertebral fusion device with a coating. Background Art

[0002] Anterior cervical interbody resection, decompression and fusion is a routine cervical surgery. The existing intervertebral fusion device used in this operation includes a fusion device and an anterior cervical plate. The appearance of the fusion device is a thick plate with the same anatomical morphology as the cervical intervertebral disc. A through bone grafting window is provided in the middle of the fusion device, and anti-reverse teeth are provided on the upper and lower surfaces of the fusion device. The anterior cervical plate is provided with screw holes. During the operation, the fusion device is implanted between the vertebrae, and the anterior cervical plate is fixed to the upper and lower vertebrae adjacent to the fusion device by screws to position the fusion device. The anterior cervical plate of this intervertebral fusion device is fixed in front of the vertebral body and behind the esophagus. Due to the notch of the plate, it is easy to cause different degrees of compression and influence on the esophagus. Some patients have difficulty swallowing after the operation, especially multi-segment fixation. The effect is more obvious. The mild case affects the patient's normal life, and the severe case is complicated by esophageal fistula and even leads to death. And as time goes by, there is often a risk of loosening of the screws.

[0003] In response to the above technical problems, the applicant has retrieved some prior art, such as the Chinese patent with patent publication number CN215459008U, which can prevent the bone screw from withdrawing and ensure the fusion effect by rotating the anti-retraction screw. However, in order to enable the bone screw to be connected to the upper and lower vertebral bodies, the two guide holes for installing the bone screw are opened at an angle upward and downward respectively. After the bone screw is fixed to the upper and lower cones, and the anti-retraction screw is rotated to resist the bone screw, only the edge of the anti-retraction screw nut is in contact with the bone screw head. Since the bone screw is in an inclined state after installation, if the bone screw is loosened when it is withdrawn, the bone screw can still press the edge of the nut and drive the nut to rotate, thereby causing the anti-retraction screw to fail to fix. Summary of the invention

[0004] The utility model aims to solve the deficiencies of the prior art and provide a high-stability cervical anterior fixation intervertebral fusion device with a coating that can effectively limit the position of bone screws to avoid the phenomenon of loosening of bone screws.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A high-stability cervical anterior fixation intervertebral fusion device with a coating, comprising a fusion body, a cover plate and a stop plate, wherein sliding grooves are symmetrically provided on both sides of the fusion body, and mounting blocks are provided in the sliding grooves, and sliding plates are symmetrically provided on the cover plate, and mounting grooves are provided on the sliding plates, and the sliding plates are slidably matched with the sliding grooves, and the mounting blocks are clamped and installed with the mounting grooves;

[0007] The cover plate is provided with a guide hole, the guide hole cooperates with the bone screw thread, the stop plate is threadedly connected with the rotating column, a sliding block is provided on the rotating column, and a locking groove is provided on the sliding block, the cover plate is provided with vertical grooves and horizontal grooves respectively, the horizontal groove is located in the vertical groove, and the vertical groove and the horizontal groove are perpendicular to each other, the horizontal groove is provided with a sliding groove, a spring is installed in the sliding groove, the rotating column and the sliding groove are slidably cooperated, the rotating column abuts the spring, the sliding groove is provided with a first annular groove and a second annular groove, the first annular groove and the second annular groove are connected by a transverse groove, a circular locking block is provided on the second annular groove, and the locking groove is engaged with the sliding block.

[0008] As a further optimization or improvement of the present solution, an annular recess is provided in the retaining plate, an annular boss is provided on the rotating column, and the annular recess and the annular boss cooperate with each other.

[0009] As a further optimization or improvement of the present solution, the guide holes include two guide holes, the axis of one guide hole is inclined upward, and the axis of the other guide hole is inclined downward, and the axes of the two guide holes intersect and form a certain angle.

[0010] As a further optimization or improvement of the present solution, avoidance grooves coaxial with the guide hole are respectively provided on both sides of the inner wall of the fusion body.

[0011] As a further optimization or improvement of the present solution, the fusion body is made of PEEK material, and the upper and lower surfaces of the fusion body are coated with pure titanium.

[0012] As a further optimization or improvement of this solution, the cover plate is made of titanium alloy material.

[0013] Beneficial effects of the utility model:

[0014] (1) In the locked state, the backstop plate is in a horizontal state and is located in the horizontal groove. When the bone screw is loose, the bone screw is in a tilted state after installation, and the head of the bone screw will press against the backstop plate and drive the backstop plate to rotate. Since the backstop plate is located in the horizontal groove, the horizontal groove can limit the rotation of the backstop plate, thereby effectively contacting the bone screw to prevent the bone screw from loosening and shifting.

[0015] (2) By performing coating surface modification on the upper and lower surfaces of the fusion body, it is beneficial to the bone integration / bone growth of the fusion device-bone interface in the early postoperative period. The spraying material can be pure titanium (Ti) coating, hydroxyapatite (HA) coating and Ti+HA double coating spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is an exploded view of the overall structure of the utility model.

[0019] Figure 3 This is a structural cross-sectional view of the cover plate.

[0020] Figure 4 It is a structural cross-sectional view of the rotating column and the stop plate.

[0021] Figure 5 Schematic diagram of the internal structure of the cover.

[0022] Figure 6 Schematic diagram of the internal structure of the chute.

[0023] Figure 7 Assembly drawing of the stop plate and rotating column.

[0024] Figure 8 Schematic diagram of the overall structure of the rotating column.

[0025] The following are marked in the figure: 1. fusion body; 2. cover plate; 3. bone screw; 4. sliding plate; 5. mounting groove; 6. sliding groove; 7. mounting block; 8. guide hole; 9. avoidance groove; 10. vertical groove; 11. stop plate; 12. spring; 13. rotating column; 14. horizontal groove; 15. sliding groove; 16. first annular groove; 17. second annular groove; 18. circular locking block; 19. transverse groove; 20. locking groove; 21. sliding block; 22. annular recess; 23. annular boss. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-Figure 8A high-stability cervical anterior fixation intervertebral fusion device with a coating, comprising a fusion body 1, a cover plate 2 and a stop plate 11, the fusion body 1 is symmetrically provided with sliding grooves 6 on both sides, and a mounting block 7 is arranged in the sliding groove 6, the cover plate 2 is symmetrically provided with sliding plates 4, the sliding plates 4 are provided with mounting grooves 5, and the sliding plates 4 are slidably matched with the sliding grooves 6, and the mounting block 7 is clamped and installed with the mounting grooves 5;

[0028] The cover plate 2 is provided with a guide hole 8, which is threadedly matched with the bone screw 3. The stop plate 11 is threadedly connected with the rotating column 13. The rotating column 13 is provided with a sliding block 21, and the sliding block 21 is provided with a locking groove 20. The cover plate 2 is provided with vertical grooves 10 and horizontal grooves 14, respectively. The horizontal groove 14 is located in the vertical groove 10, and the vertical groove 10 and the horizontal groove 14 are perpendicular to each other. A sliding groove 15 is provided in the horizontal groove 14, and a spring 12 is installed in the sliding groove 15. The rotating column 13 slides with the sliding groove 15, and the rotating column 13 abuts against the spring 12. A first annular groove 16 and a second annular groove 17 are provided inside the sliding groove 15, and the first annular groove 16 and the second annular groove 17 are connected by a transverse groove 19. A circular locking block 18 is provided on the second annular groove 17, and the locking groove 20 is engaged with the sliding block 21.

[0029] It should be noted that, in the unlocked state, the backstop plate 11 is located inside the vertical slot 10 and does not interfere with the installation path of the bone screw 3. Figure 1 , Figure 3 In the locked state, the backstop plate 11 is located inside the horizontal groove 14, and the backstop plate 11 can abut against the head of the bone screw 3.

[0030] See also Figure 7-Figure 8 The anti-recoil plate 11 is provided with an annular concave platform 22, and the rotating column 13 is provided with an annular convex platform 23, and the annular concave platform 22 and the annular convex platform 23 cooperate with each other. It should be noted that the purpose of the cooperation between the annular concave platform 22 and the annular convex platform 23 is to limit the anti-recoil plate 11. In the locked state, the cooperation between the annular concave platform 22 and the annular convex platform 23 between the anti-recoil plate 11 and the rotating column 13 can effectively prevent the anti-recoil plate 11 from sliding out of the horizontal groove 14.

[0031] See also Figure 1-Figure 2 The guide holes 8 include two guide holes, one of which has an axis that is tilted upward, and the other of which has an axis that is tilted downward. The axes of the two guide holes 8 intersect and form a certain angle. It should be noted that the two bone screws 3 are threadedly connected to the guide holes 8, so that the bone screws 3 can be fixedly connected to the upper vertebral body and the lower vertebral body in the vertebral lesion gap.

[0032] See also Figure 1-Figure 2The inner walls of the fusion body 1 are provided with avoidance grooves 9 coaxial with the guide hole 8 on both sides. In order to avoid the installation of the bone screw 3, arc-shaped avoidance grooves 9 coaxial with the guide hole 8 are provided on the inner walls of the fusion body 1 on both sides.

[0033] Specifically, the fusion body 1 is made of PEEK material, and the upper and lower surfaces of the fusion body 1 are coated with pure titanium. By performing coating surface modification treatment on the upper and lower surfaces of the components made of PEEK material, it is beneficial to the bone integration / bone growth of the fusion device-bone interface in the early postoperative period. The surface of the fusion body 1 can also be sprayed with hydroxyapatite (HA) coating and Ti+HA double coating.

[0034] Specifically, the cover plate 2 is made of titanium alloy. It should be noted that the bone screw 3 is a developing screw.

[0035] The implementation principle of the utility model is as follows: during the operation, the sliding plate 4 on the cover plate 2 is inserted into the sliding groove 6, and the cover plate 2 is pushed to make the sliding plate 4 slide upward along the sliding groove 6. When the installation fixing groove 5 is engaged with the installation fixing block 7, the installation of the cover plate 2 is completed, and then the fusion body 1 is placed into the intervertebral space of the disease, and the two bone screws 3 are screwed in along the guide hole 8, so that the two bone screws 3 respectively fix the upper vertebral body and the lower vertebral body in the intervertebral space.

[0036] The rotating column 13 is turned 90 degrees clockwise. Through the threaded cooperation between the rotating column 13 and the backstop plate 11, the rotating column 13 rotates clockwise to drive the backstop plate 11 to rotate synchronously. At the same time, the sliding block 21 located in the first annular groove 16 rotates. When the backstop plate 11 is parallel to the horizontal groove 14, the sliding block 21 cooperates with the transverse groove 19 to push the rotating column 13, so that the backstop plate 11 moves into the horizontal groove 14. At the same time, the sliding block 21 slides along the transverse groove 19. When the transverse groove 19 reaches the second annular groove 16, the sliding block 21 rotates. After the groove 17 is formed, the backstop plate 11 can abut the head of the bone screw 3. At this time, the rotating column 13 is rotated counterclockwise. Through the threaded cooperation of the rotating column 13 and the backstop plate 11, the counterclockwise rotation of the rotating column 13 will not drive the backstop plate 11 to rotate. The counterclockwise rotation of the rotating column 13 can drive the sliding block 21 to slide in the second annular groove 17. When the locking groove 20 on the sliding block 21 is engaged with the circular locking block 18 in the second annular groove 17, the bone screw 3 is limited and fixed.

[0037] In the locked state, the backstop plate 11 is in a horizontal state and is located in the horizontal groove 14. When the bone screw 3 is loose, since the bone screw 3 is in an inclined state after installation, the head of the bone screw 3 will press against the backstop plate 11 and drive the backstop plate 11 to rotate. Since the backstop plate 11 is located in the horizontal groove 14, the horizontal groove 14 can limit the rotation of the backstop plate 11, thereby effectively fixing the bone screw 3.

[0038] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A highly stable anterior cervical intervertebral fusion device with a coating, characterized in that: It comprises a fusion body (1), a cover plate (2) and a stop plate (11); the fusion body (1) is symmetrically provided with sliding grooves (6), the sliding grooves (6) are provided with mounting blocks (7); the cover plate (2) is symmetrically provided with sliding plates (4), the sliding plates (4) are provided with mounting grooves (5), the sliding plates (4) are slidably matched with the sliding grooves (6), and the mounting blocks (7) and the mounting grooves (5) are snap-fitted and installed; The cover plate (2) is provided with a guide hole (8), the guide hole (8) is threadedly matched with the bone screw (3), the stop plate (11) is threadedly connected with the rotating column (13), the rotating column (13) is provided with a sliding block (21), the sliding block (21) is provided with a locking groove (20), the cover plate (2) is provided with a vertical groove (10) and a horizontal groove (14), the horizontal groove (14) is located in the vertical groove (10), and the vertical groove (10) and the horizontal groove (14) are perpendicular to each other, and the horizontal groove (10) and the horizontal groove (14) are respectively provided with a vertical groove (10) and a horizontal groove (14) A slide groove (15) is provided in the slide groove (15), a spring (12) is installed in the slide groove (15), the rotating column (13) and the slide groove (15) are slidably matched, the rotating column (13) abuts against the spring (12), a first annular groove (16) and a second annular groove (17) are provided in the slide groove (15), the first annular groove (16) and the second annular groove (17) are connected through a transverse groove (19), a circular locking block (18) is provided on the second annular groove (17), and the locking groove (20) is engaged with the sliding block (21).

2. The high-stability cervical anterior fixation intervertebral fusion cage with coating according to claim 1, characterized in that: An annular concave platform (22) is arranged in the stop plate (11), and an annular convex platform (23) is arranged on the rotating column (13), and the annular concave platform (22) and the annular convex platform (23) are matched with each other.

3. The high-stability anterior cervical intervertebral fusion device with coating according to claim 1, characterized in that: The guide holes (8) include two guide holes, the axis of one guide hole (8) is inclined upward, and the axis of the other guide hole (8) is inclined downward, and the axes of the two guide holes (8) intersect and form a certain angle.

4. The high-stability cervical anterior fixation intervertebral fusion cage with coating according to claim 1, characterized in that: Avoidance grooves (9) coaxial with the guide hole (8) are respectively provided on both sides of the inner wall of the fusion body (1).

5. The high-stability cervical anterior fixation intervertebral fusion cage with coating according to claim 1, characterized in that: The fusion body (1) is made of PEEK material, and the upper and lower surfaces of the fusion body (1) are coated with pure titanium.

6. The high-stability anterior cervical intervertebral fusion device with coating according to claim 1, characterized in that: The cover plate (2) is made of titanium alloy material.

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