Cervical intervertebral fusion device

Abstract

The utility model discloses a cervical intervertebral fusion device, which belongs to the field of medical devices. The utility model includes a support frame and a lattice structure, wherein the support frame constitutes the outer shell of the fusion device, the lattice structure is filled and arranged in the support frame, and the fusion device is provided with a bone grafting bin that penetrates the top support part, the lattice structure and the bottom support part, the bone grafting bin and the lattice structure are connected, the top support part and the bottom support part adopt the same structure, the top support part and the bottom support part both include an outer support bar and an inner support bar, the outer support bar is a polygonal annular structure covering the outer edge of the lattice structure, the top support part and the bottom support part are provided with at least one inner support bar, the two ends of the inner support bar are connected and fixed to the outer support bar, and the outer support bar and the inner support bar are provided with positioning parts away from the lattice structure. The utility model has a reasonable structural design, is stable and firm to be implanted and used, has a good bone ingrowth effect, and meets the needs of intervertebral fusion.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments, and in particular relates to a cervical intervertebral fusion device. Background Art

[0002] Degeneration of the intervertebral disc will reduce the stability between the vertebrae, causing various symptoms to the patient, including neuralgia or functional disorders. The common method to treat intervertebral disc degeneration is to use intervertebral fusion. The principle of intervertebral fusion is to peel off the degenerated or necrotic intervertebral disc, and then implant the intervertebral fusion device into the patient's intervertebral space through surgery to expand and correct the distance between the vertebrae, and finally fuse the upper and lower intervertebral segments to make the intervertebral segments more stable.

[0003] The intervertebral fusion device has functions such as support and load distribution, and can better restore the intervertebral space height and the physiological curvature of the spine. The intervertebral fusion device is an implantable medical device used between the upper and lower vertebrae of the human body. It is one of the main implants for achieving fusion of adjacent vertebral spaces in the spine. Its safety and effectiveness directly affect the effect of bone fusion of adjacent vertebrae. If the elastic modulus of the intervertebral fusion device is different from that of human bones, it will cause stress shielding effect of the intervertebral fusion device after implantation in the human body, causing bone absorption, and then loosening of the intervertebral fusion device and failure of bone structure prosthesis implantation. Only when the elastic modulus of the intervertebral fusion device is close to the elastic modulus of human bones can stress shielding and other problems be avoided. In order to make the elastic modulus of the intervertebral fusion device consistent with the corresponding bone elastic modulus, the intervertebral fusion device is often given the expected elastic modulus through a pore structure.

[0004] The existing intervertebral fusion devices are not strong enough. During the implantation and use of the intervertebral fusion devices, the vertebrae will exert external forces on the intervertebral fusion devices, which may cause the intervertebral fusion devices of insufficient strength to be damaged and broken. Clinical applications have found that the existing intervertebral fusion devices are prone to loosening, sliding out and falling off during implantation and use. The bone ingrowth effect is poor, which affects the bone fusion effect and leads to the situation of non-fusion between the vertebrae. In order to ensure that the cervical intervertebral fusion device is stable and firm during implantation and use, and to improve the bone ingrowth effect and the fusion efficiency of the cervical intervertebral fusion device, a new type of cervical intervertebral fusion device is needed to solve the above-mentioned technical problems. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a cervical intervertebral fusion device which has a reasonable structural design, is stable and firm to be implanted, has good bone ingrowth effect, and meets the needs of intervertebral fusion.

[0006] In order to solve the above technical problems, the technical solution adopted by the cervical intervertebral fusion device of the utility model is:

[0007] The cervical intervertebral fusion device includes a support frame and a lattice structure, the support frame constitutes the outer shell of the fusion device, the lattice structure is filled and arranged in the support frame, the lattice structure is a random lattice structure, the support frame includes a top support part and a bottom support part, the fusion device is provided with a bone grafting bin that penetrates the top support part, the lattice structure and the bottom support part, the bone grafting bin and the lattice structure are connected, the top support part and the bottom support part adopt the same structure, the top support part and the bottom support part both include an outer support bar and an inner support bar, the outer support bar is a polygonal annular structure covering the outer edge of the lattice structure, at least one inner support bar is arranged on the top support part and the bottom support part, both ends of the inner support bar are connected and fixed to the outer support bar, and the outer support bar and the inner support bar are provided with positioning parts away from the lattice structure.

[0008] Compared with the prior art, the utility model has the following advantages and effects: the utility model has a reasonable structural design, the lattice structure of the fusion device is a random lattice structure, and the random lattice structure can improve the bone ingrowth effect. When the fusion device is implanted and used, the top support part and the bottom support part adopt the same structure, and the outer support bar and the inner support bar are provided with positioning parts away from the lattice structure side. The positioning parts of the top support part and the bottom support part can ensure that the fusion device is occluded and fixed with the two adjacent vertebrae, so that the fusion device is stably and firmly located between the two adjacent vertebrae. At the same time, the top surface of the fusion device corresponding to the top support part and the bottom surface of the fusion device corresponding to the bottom support part of the fusion device are only provided with the outer support bar and the inner support bar, and most of the surface of the top surface and the bottom surface of the fusion device are occupied by the lattice structure surface. Therefore, when the fusion device is implanted and used, the surfaces of the two adjacent vertebrae of the fusion device have a large area of ​​contact with the surface of the lattice structure, which can effectively increase the bone ingrowth effect and improve the fusion efficiency of the cervical intervertebral fusion device.

[0009] Furthermore, a side support portion is provided outside the lattice structure between the top support portion and the bottom support portion, and two ends of the side support portion are respectively connected and fixed to the outer support bars of the top support portion and the bottom support portion.

[0010] Furthermore, the side support part includes a main support bar and an auxiliary support bar, the main support bar is a long straight bar structure, the auxiliary support bar is a cross X-shaped structure, both ends of the main support bar are connected and fixed to the outer support bars of the top support part and the bottom support part, and the auxiliary support bar is arranged adjacent to the main support bar and is respectively connected and fixed to the main support bar, the top support part and the bottom support part.

[0011] Furthermore, the cervical intervertebral fusion device as a whole is a polyhedron structure with a narrow front side and a wide back side. An instrument groove is provided on the back side of the fusion device, and an instrument hole that penetrates the bone grafting chamber is provided in the instrument groove.

[0012] Furthermore, the top support portion and the bottom support portion are each provided with two inner support bars, which are symmetrically arranged on both sides of the end of the bone grafting bin, and the length direction of the inner support bars is the same as the spacing direction of the front and back sides of the fusion device, and the two ends of the inner support bars are respectively connected and fixed to the outer support bars on the front and back sides of the fusion device.

[0013] Furthermore, the positioning portions of the outer support bars and the inner support bars arranged away from the lattice structure are protrusions arranged in sequence, and the protrusions are sawtooth structures.

[0014] Furthermore, the top surface of the cervical intervertebral fusion device corresponding to the top support portion is a curved surface structure, and the bottom surface of the cervical intervertebral fusion device corresponding to the bottom support portion is a flat surface structure.

[0015] Furthermore, the inner hole wall of the bone grafting bin is symmetrically provided with inner support parts, and the inner support parts are two support bars arranged in a cross X shape.

[0016] Furthermore, the random lattice structure of the cervical intervertebral fusion device includes a plurality of random lattice units, and the structure of the random lattice unit includes a trabecular structure and a Thiessen polygon structure.

[0017] Furthermore, the cervical intervertebral fusion cage is integrally formed by 3D printing.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0020] Figure 1 The utility model is a schematic diagram of a top view of the structure of a cervical intervertebral fusion device.

[0021] Figure 2 The utility model is a left-side structural schematic diagram of a cervical intervertebral fusion device.

[0022] Figure 3 The utility model is a rear view structural schematic diagram of a cervical intervertebral fusion device.

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the support frame of the utility model.

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the random lattice structure of the utility model.

[0025] Figure 6It is a schematic diagram of the plane structure of the random lattice structure of the utility model.

[0026] In the figure: 1. support frame, 2. lattice structure, 3. top support part, 4. bottom support part, 5. bone grafting chamber, 6. outer support bar, 7. inner support bar, 8. positioning part, 9. side support part, 10. main support bar, 11. auxiliary support bar, 12. instrument groove, 13. instrument hole, 14. inner support part, 15. top surface, 16. bottom surface, 17. front surface, 18. back surface, 19. side surface, 20. rear bevel, 21. front bevel. DETAILED DESCRIPTION

[0027] In order to further describe the present invention, a specific implementation of a cervical intervertebral fusion device is further described below in conjunction with the accompanying drawings. The following embodiments are explanations of the present invention and the present invention is not limited to the following embodiments.

[0028] This embodiment provides a cervical intervertebral fusion device for implantation in the cervical intervertebral fusion fixation. Figure 1 and Figure 2 The cervical intervertebral fusion device is a flat polyhedral structure as a whole, including a top surface 15, a bottom surface 16, a front surface 17, a back surface 18 and two side surfaces 19. The two side surfaces 19 have the same structure and are symmetrically arranged. The back surface 18 includes rear inclined surfaces 20 symmetrically arranged on both sides of the back surface 18 toward the front surface 17, and the side surfaces 19 include front inclined surfaces 21 arranged on the side surfaces 19 toward the front surface 17. The fusion device as a whole has a structure with a narrow front surface 17 and a wide back surface 18. The overall structure of the fusion device has a high degree of adaptability to the adjacent cervical intervertebral structure, and the implantation and use structure fits well. The top surface 15, the bottom surface 16, the front surface 17, the back surface 18 and the two side surfaces 19 of the cervical intervertebral fusion device adopt rounded corners to achieve arc transition connection.

[0029] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The cervical intervertebral fusion device of this embodiment includes a support frame 1 and a lattice structure 2. The support frame 1 constitutes the outer shell of the fusion device, and the lattice structure 2 is filled and arranged in the support frame 1. The lattice structure 2 is a random lattice structure. The support frame 1 provides structural strength for the entire fusion device. The random lattice structure can improve the bone ingrowth effect. The elastic modulus of the random lattice structure is close to the elastic modulus of human bone, which can effectively avoid stress shielding.

[0030] The support frame 1 includes a top support part 3 and a bottom support part 4. The fusion device is provided with a bone grafting chamber 5 which penetrates the top support part 3, the lattice structure 2 and the bottom support part 4. The bone grafting chamber 5 is connected to the lattice structure 2. The top support part 3 and the bottom support part 4 adopt the same structure. The top support part 3 and the bottom support part 4 both include an outer support bar 6 and an inner support bar 7. When implanted and used, the surfaces of two adjacent vertebrae of the fusion device have a large area of ​​contact with the surface of the lattice structure 2, which can effectively increase the bone ingrowth effect and improve the fusion efficiency of the cervical intervertebral fusion device.

[0031] The outer support bar 6 of the top support part 3 is a polygonal ring structure covering the outer edge of the lattice structure. The top support part 3 and the bottom support part 4 are provided with at least one inner support bar 7. The two ends of the inner support bar 7 are connected and fixed to the outer support bar 6. The outer support bar 6 and the inner support bar 7 are both provided with positioning parts 8 on the side away from the lattice structure 2. The positioning parts 8 of the top support part 3 and the bottom support part 4 can ensure that the fusion device is occluded and fixed with the two adjacent vertebrae, so that the fusion device is stably and firmly located between the two adjacent vertebrae.

[0032] This embodiment does not limit the shape of the bone grafting chamber 5. The bone grafting chamber 5 is used to fill the corresponding bone tissue material to help the human bone tissue to grow. The bone grafting chamber 5 can be a cylindrical hole, an elliptical hole, a standard polygonal hole, and an irregular polygonal hole.

[0033] In some embodiments, a side support portion 9 is provided on the outside of the lattice structure 2 between the top support portion 3 and the bottom support portion 4, and both ends of the side support portion 9 are respectively connected and fixed to the outer support bars 6 of the top support portion 3 and the bottom support portion 4. The side support portion 9 provides support strength for the side surface 19 of the entire fusion device to prevent the vertebrae from exerting external force on the intervertebral fusion device when the fusion device is implanted and used, thereby preventing the fusion device from being damaged or broken due to insufficient strength.

[0034] In some embodiments, the side support portion 9 includes a main support bar 10 and an auxiliary support bar 11. The main support bar 10 is a long straight bar structure, and the auxiliary support bar 11 is a cross X-shaped structure. Both ends of the main support bar 10 are connected and fixed to the outer support bars 6 of the top support portion 3 and the bottom support portion 4. The auxiliary support bar 11 is arranged adjacent to the main support bar 10 and is respectively connected and fixed to the main support bar 10, the top support portion 3 and the bottom support portion 4. The overall structure of the side support portion 9 is reasonable and the structural strength is high. While effectively supporting the side surface 19 of the fusion device, the side support portion 9 occupies a small area on the side surface 19 of the fusion device. The random lattice structure of the side surface 19 of the fusion device can be more conducive to the growth and fusion of bone tissue when implanted.

[0035] For example, the main support bar 10 of the side support portion 9 is disposed at the intersection corner between the side surface 19 and the back surface 18 of the fusion device.

[0036] In some embodiments, the cervical intervertebral fusion device is a polyhedral structure with a narrow front side 17 and a wide back side 18. The implantation process of the device is smoother and more efficient. An instrument groove 12 is provided on the back side 18 of the device. An instrument hole 13 which is connected with the bone grafting chamber 5 is provided in the instrument groove 12. The instrument hole 13 can adapt to various clamping tools. The operator can use the clamping tool to stably clamp the intervertebral fusion device and then implant it into the adjacent spinal spaces of the patient, thereby improving the convenience of surgical operation and the accuracy of implantation and installation of the device. The instrument hole 13 can be a stepped structure, a threaded hole structure and a mixed structure.

[0037] In some embodiments, the top support portion 3 and the bottom support portion 4 are both provided with two inner support bars 7, and the two inner support bars 7 are symmetrically arranged on both sides of the end of the bone grafting chamber 5, and the length direction of the inner support bar 7 is the same as the spacing direction of the front side 17 and the back side 18 of the fusion device. The two ends of the inner support bar 7 are respectively connected and fixed to the outer support bars 6 on the front side 17 and the back side 18 of the fusion device. The overall structure is stable and firm, and the structural strength meets the needs of fusion device implantation.

[0038] In some embodiments, the positioning portions 8 arranged on the outer support bar 6 and the inner support bar 7 away from the lattice structure 2 are protrusions arranged in sequence. Furthermore, the protrusions are serrated structures, and the protrusions can be tightly and firmly pressed and fixed to the adjacent cervical vertebrae, so that the fusion device can be stably set between two adjacent cervical vertebrae after implantation, avoiding the fusion device from loosening, slipping out and falling off during use.

[0039] In some embodiments, the top surface 15 of the cervical intervertebral fusion device corresponding to the top support portion 3 is a curved structure, and the bottom surface 16 of the cervical intervertebral fusion device corresponding to the bottom support portion 4 is a flat structure. When the cervical intervertebral fusion device is implanted between adjacent vertebrae, it can fit and press the vertebrae more closely.

[0040] In some embodiments, the inner hole wall of the bone grafting bin 5 is symmetrically provided with an inner support portion 14, which can support the outer side of the bone grafting bin 5 and the inside of the fusion device, improve the internal structural strength of the fusion device, and avoid the adjacent vertebrae from squeezing the fusion device with external force during implantation and use, causing the fusion device to collapse and be damaged. The inner support portion 14 is two support bars arranged in a cross X shape. The two support bars of the cross X-shaped structure have a reasonable structure and high support strength. While effectively supporting the inner hole wall of the bone grafting bin 5, the inner support portion 14 occupies a small area on the inner hole wall of the bone grafting bin 5. Most of the surface of the random lattice structure corresponding to the inner hole wall of the bone grafting bin 5 is connected to the bone grafting bin 5, so that after the bone tissue material is filled in the bone grafting bin 5, the bone tissue material can contact and grow into fusion with the random lattice structure corresponding to the inner hole wall of the bone grafting bin 5 over a large area, thereby shortening the implantation and fusion time of the intervertebral fusion device and improving the fusion efficiency.

[0041] See also Figure 5 and Figure 6 In some embodiments, the random lattice structure of the cervical intervertebral fusion device includes a plurality of random lattice units, the structure of the random lattice unit includes a trabecular structure and a Thiessen polygon structure, the random lattice unit includes at least three connecting rod structures, the connecting rod structures are connected end to end to form a polygon, and the polygon includes but is not limited to a triangle, a quadrilateral, a pentagon, a hexagon, and a heptagon.

[0042] The connecting rod structure forms a node at the connection, and the nodes of two adjacent polygons overlap. In multiple random lattice units, the connecting rod structures of two adjacent random lattice units overlap. The porosity of the random lattice structure is the ratio of the volume of the pore part between the connecting rod structure to the volume of the random lattice structure. The porosity of the random lattice structure ranges from 5% to 95%. The diameter, length, and number of the connecting rod structure of the random lattice structure jointly regulate the porosity of the random lattice structure. By adjusting the porosity of the random lattice structure, the elastic modulus of the random lattice structure is close to the elastic modulus of human bone. The diameter of the connecting rod structure of the random lattice structure is 100μm to 400μm, and the length of the connecting rod structure is 100μm-2000μm.

[0043] In some embodiments, the cervical intervertebral fusion device is manufactured in one piece through 3D printing, and the product processing is efficient and the size is precise.

[0044] In some embodiments, the random lattice structure of the top surface 15 and the bottom surface 16 of the cervical intervertebral fusion device can be hill-shaped, wavy, or sawtooth-shaped. When the cervical intervertebral fusion device is implanted and used, the top surface 15 and the bottom surface 16 of the fusion device can use their own structure to better fix between adjacent vertebrae, and can improve the contact and fit between the fusion device and the adjacent vertebrae, which is conducive to the growth and fusion of bone tissue.

[0045] The above contents described in this specification are merely examples of the present utility model. Those skilled in the art of the present utility model may make various modifications or additions to the specific embodiments described, or replace them in similar ways, as long as they do not deviate from the contents of the present utility model specification or exceed the scope defined in the claims, they shall all fall within the protection scope of the present utility model.

Claims

1. A cervical intervertebral fusion cage, characterized in that: The cervical intervertebral fusion device comprises a support frame (1) and a lattice structure (2), wherein the support frame (1) constitutes the outer shell of the fusion device, the lattice structure (2) is filled and arranged in the support frame (1), and the lattice structure (2) is a random lattice structure. The support frame (1) comprises a top support portion (3) and a bottom support portion (4), and the fusion device is provided with a bone grafting chamber (5) penetrating the top support portion (3), the lattice structure (2) and the bottom support portion (4), the bone grafting chamber (5) is connected to the lattice structure (2), and the top support portion The top support portion (3) and the bottom support portion (4) adopt the same structure, the top support portion (3) and the bottom support portion (4) both comprise an outer support bar (6) and an inner support bar (7), the outer support bar (6) is a polygonal ring structure covering the outer edge of the lattice structure (2), the top support portion (3) and the bottom support portion (4) are provided with at least one inner support bar (7), the two ends of the inner support bar (7) are connected and fixed to the outer support bar (6), and the outer support bar (6) and the inner support bar (7) are both provided with positioning portions (8) on the sides away from the lattice structure (2).

2. The cervical intervertebral fusion cage according to claim 1, characterized in that: A side support portion (9) is provided on the outside of the lattice structure (2) between the top support portion (3) and the bottom support portion (4), and two ends of the side support portion (9) are respectively connected and fixed to the outer support bars (6) of the top support portion (3) and the bottom support portion (4).

3. The cervical intervertebral fusion cage according to claim 2, characterized in that: The side support portion (9) comprises a main support bar (10) and an auxiliary support bar (11); the main support bar (10) is a long straight bar structure, and the auxiliary support bar (11) is a cross-X-shaped structure; both ends of the main support bar (10) are connected and fixed to the outer support bars (6) of the top support portion (3) and the bottom support portion (4); and the auxiliary support bar (11) is arranged adjacent to the main support bar (10) and is respectively connected and fixed to the main support bar (10), the top support portion (3) and the bottom support portion (4).

4. The cervical intervertebral fusion cage according to claim 1, characterized in that: The cervical intervertebral fusion device is a polyhedral structure with a narrow front side and a wide back side. An instrument groove (12) is provided on the back side of the fusion device, and an instrument hole (13) is provided in the instrument groove (12) and is connected to the bone grafting chamber (5).

5. The cervical intervertebral fusion cage according to claim 4, characterized in that: The top support portion (3) and the bottom support portion (4) are both provided with two inner support bars (7), which are symmetrically arranged on both sides of the end of the bone grafting chamber (5), respectively, and the length direction of the inner support bars (7) is the same as the spacing direction of the front and back sides of the fusion device, and the two ends of the inner support bars (7) are respectively connected and fixed to the outer support bars (6) on the front and back sides of the fusion device.

6. A cervical intervertebral fusion cage according to claim 1 or 5, characterized in that: The positioning portions (8) arranged on the side of the outer support bar (6) and the inner support bar (7) away from the lattice structure (2) are protrusions arranged in sequence, and the protrusions are sawtooth structures.

7. The cervical intervertebral fusion cage according to claim 1, characterized in that: The top surface of the cervical intervertebral fusion device corresponding to the top support portion (3) is a curved surface structure, and the bottom surface of the cervical intervertebral fusion device corresponding to the bottom support portion (4) is a flat surface structure.

8. The cervical intervertebral fusion cage according to claim 1, characterized in that: The inner hole wall of the bone grafting bin (5) is symmetrically provided with an inner support portion (14), and the inner support portion (14) is two support bars arranged in a cross X shape.

9. The cervical intervertebral fusion cage according to claim 1, characterized in that: The random lattice structure of the cervical intervertebral fusion device includes a plurality of random lattice units, and the structure of the random lattice unit includes a trabecular structure and a Thiessen polygon structure.

10. A cervical intervertebral fusion cage according to claim 1 or 9, characterized in that: The cervical intervertebral fusion cage is manufactured by integrally forming through 3D printing.

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