3D-printed distractable interbody fusion cage

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a 3D printing expandable interbody fusion cage which comprises a fusion cage body, and the fusion cage body comprises a screw, a fixing pin, a transverse pin, a frame body, an upper base plate, a lower base plate and a supporting sliding block arranged between the upper base plate and the lower base plate. The distractable interbody fusion cage and intervertebral contact parts are manufactured by using a 3D printing technology, and three-dimensional porous structures similar to cancellous bone structures are designed on the surfaces of the upper base plate and the lower base plate, so that the fusion rate of the interbody fusion cage and the spine of a human body can be increased; meanwhile, the interbody fusion cage is simple in structure and convenient to operate, is implanted into the interbody space of the human body in a contracted state, is expanded in situ, can increase the contact area with an end plate and the bone chip filling space, can recover the forward convex curvature, has high biomechanical stability, is suitable for various lumbar degenerative diseases needing interbody fusion, and can be widely applied to the field of lumbar interbody fusion. The clinical treatment effect can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and specifically relates to a 3D printed expandable intervertebral fusion device. Background Art

[0002] With the changes in human living habits and working methods, human spinal diseases have gradually become an important disease that affects people's quality of life. When the condition is serious or cannot be treated conservatively, most of the time, surgical treatment is performed by inserting an intervertebral fusion device after disc removal, and generally minimally invasive spinal surgery is used for treatment.

[0003] Minimally invasive spinal surgery means avoiding large incisions under certain medical risks, using tiny incisions or puncture channels, using special instruments and devices, and reaching the lesion from the normal anatomical structure under the monitoring of imaging instruments or the guidance of navigation technology. Various miniature manual or electric instruments and equipment are used to complete the entire surgical process under visual conditions, so as to achieve smaller incisions, less tissue trauma, less bleeding, higher operating precision, definite results, and faster postoperative functional recovery than traditional or standard spinal surgery.

[0004] Although minimally invasive spinal surgery can reduce trauma to patients while providing treatment, it also limits the application of traditional intervertebral fusion devices in minimally invasive surgery. Traditional intervertebral fusion devices have a fixed shape and internal filling space, which can easily damage nerve roots during minimally invasive surgery. They are also unable to fully open the curved spine and have a small amount of bone chips, which prevents the intervertebral fusion device from better integrating with the human body, thereby reducing the treatment effect. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a 3D printed expandable intervertebral fusion device, which solves the problems that the existing intervertebral fusion device has a fixed shape and fills a space, cannot fully expand the curved spine, and has a small amount of bone chips filling, which affects the fusion quality and treatment effect.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: providing a 3D printed expandable intervertebral fusion device, including a fusion device body, the fusion device body including screws, a frame, an upper base plate, a lower base plate and a support slider arranged between the upper base plate and the lower base plate, the support slider is a rectangular parallelepiped structure, and V-shaped bosses are correspondingly arranged on the front and rear sides thereof; a first through hole matching the screw is arranged at one end of the support slider, and a U-shaped groove is arranged at the other end thereof;

[0007] The upper base plate and the lower base plate each include a bottom plate, a front side plate and a rear side plate arranged on the bottom plate, the rear side plate and the front side plate each include a first baffle plate, a second baffle plate and a third baffle plate, a first slide groove is arranged between the first baffle plate and the second baffle plate, a second slide groove is arranged between the second baffle plate and the third baffle plate, and the second slide groove and the first slide groove are matched with the V-shaped boss; the upper base plate and the lower base plate are fixed by being embedded with a supporting slider;

[0008] The frame is arranged outside the supporting sliding block and is a rectangular parallelepiped structure. A second through hole matching the screw is arranged at one end of the frame, and the second through hole is arranged corresponding to the first through hole.

[0009] The beneficial effects of adopting the above technical solution are as follows: the intervertebral fusion device includes screws, an upper base plate, a lower base plate and a supporting slider, which has a simple structure and is easy to install and use; the V-shaped boss of the supporting slider can be engaged and fixed with the first slide groove and the second slide groove on the upper base plate and the lower base plate during use, so as to support and fix the upper base plate and the lower base plate, and the frame can further fix the upper base plate, the lower base plate and the supporting slider, thereby improving the stability of the intervertebral fusion device after implantation and avoiding vertebral settlement; and at this time, the intervertebral fusion device is not expanded and has a small volume, which can improve the applicability of minimally invasive spinal surgery. ; In addition, by rotating the screws arranged in the first through hole and the second through hole, the support slider can be moved forward and backward, and then the upper base plate and the lower base plate can be moved up and down, so as to achieve the effect of spreading the upper base plate and the lower base plate, which can completely restore the physiological curvature of the spine, increase the bone filling space, and effectively improve the fusion rate of the intervertebral fusion device and the human spine; at the same time, the spreading method is achieved by the cooperation of the external thread and the internal thread, which can realize the self-fixation effect after spreading, avoid vertebral settlement, and improve the safety of use.

[0010] Furthermore, a first plant hole is arranged in the middle of the frame, and a second plant hole is arranged correspondingly on the front and rear sides thereof; a third plant hole is arranged in the middle of the supporting slider, and a fourth plant hole is arranged correspondingly on the front and rear sides thereof.

[0011] The beneficial effects of adopting the above technical solution are: the first plant hole, the second plant hole, the third plant hole and the fourth plant hole can provide filling space for bone chips, thereby increasing the fusion space and improving the fusion efficiency and quality.

[0012] Furthermore, a third through hole is arranged on one side of the first plant hole, and the third through hole is arranged on one side of the second through hole, and a fixing pin is arranged inside the third through hole; a fourth through hole is arranged correspondingly on one side of the second plant hole, and the fourth through hole is arranged correspondingly to the U-shaped groove, and a transverse pin is arranged inside the fourth through hole.

[0013] The beneficial effects of adopting the above technical solution are: the fixing pin can fix the screw to prevent the screw from falling out, and the transverse pin can support the supporting slider to prevent the supporting slider from falling off. The fixing pin and the transverse pin can improve the stability of the intervertebral fusion device after implantation.

[0014] Furthermore, a mounting groove is provided on the frame, and the mounting groove is provided between the second through hole and the second plant hole.

[0015] The beneficial effects of adopting the above technical solution are: the installation groove is used to install and fix the intervertebral fusion device, thereby improving the implantation stability of the intervertebral fusion device in the human body.

[0016] Furthermore, a porous structure layer is provided on the bottom plate.

[0017] The beneficial effect of adopting the above technical solution is that the porous structure layer is a three-dimensional structure similar to trabeculae, which can improve the fusion efficiency after implantation.

[0018] Furthermore, a fifth through hole is provided inside the screw, and the fifth through hole is used for implanting bone chips.

[0019] In summary, the 3D printed expandable intervertebral fusion cage provided by the utility model has the following beneficial effects:

[0020] (1) The intervertebral fusion device includes screws, a frame, an upper base plate, a supporting slider and pins. It has a simple structure and is easy to use. It is implanted in the intervertebral space in a contracted state and expanded in situ, which can increase the contact area with the end plate and restore the lordotic curvature. It has strong biomechanical stability and is suitable for various lumbar degenerative diseases that require intervertebral fusion, and can effectively improve the clinical treatment effect.

[0021] (2) The intervertebral fusion device can realize the forward and backward movement of the support slider through screws. During the movement of the support slider, the upper base plate and the lower base plate are driven to move up and down, thereby realizing the expansion between the upper base plate and the lower base plate. Different expansion heights can be used to adapt to different spinal curvatures, effectively improving the applicability and clinical treatment effect of the intervertebral fusion device.

[0022] (3) By adjusting the height of the intervertebral fusion cage, the bone filling space and the amount of bone graft can be increased, thereby improving the fusion efficiency and quality.

[0023] (4) The intervertebral fusion device utilizes the synergistic effect of the external thread and the internal thread to achieve expansion, which can effectively fix and position the expansion height of the intervertebral fusion device, avoid vertebral settlement, and improve safety of use.

[0024] (5) The intervertebral fusion device is made using 3D printing technology, which can improve support and stability, help promote the bone healing process, and the porous structure layer on the base plate is a three-dimensional structure similar to trabeculae, which can improve the fusion efficiency and quality after implantation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 It is an exploded schematic diagram of the utility model;

[0027] Figure 3 It is a schematic diagram of the structure of the upper substrate and the lower substrate in the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the supporting slider in the utility model;

[0029] Figure 5 It is a structural schematic diagram of the frame in the utility model;

[0030] Figure 6 It is a cross-sectional view of the utility model.

[0031] Among them, 1. fusion device body; 2. screw; 21. fifth through hole; 3. frame; 31. second through hole; 32. first plant hole; 33. second plant hole; 34. third through hole; 35. fixing pin; 36. fourth through hole; 37. horizontal pin; 38. mounting groove; 4. upper base plate; 41. bottom plate; 42. front side plate; 43. rear side plate; 44. first baffle plate; 45. second baffle plate; 46. third baffle plate; 47. first slide groove; 48. second slide groove; 49. porous structure layer; 5. lower base plate; 6. supporting slider; 61. V-shaped boss; 62. first through hole; 63. U-shaped groove; 64. third plant hole; 65. fourth plant hole. DETAILED DESCRIPTION

[0032] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0033] like Figure 1 and Figure 2As shown, the 3D printed expandable intervertebral fusion device provided by the utility model comprises a fusion device body 1, wherein the fusion device body 1 comprises a screw 2, a frame 3, an upper base plate 4, a lower base plate 5 and a support slider 6 arranged between the upper base plate 4 and the lower base plate 5; the intervertebral fusion device is made by 3D printing technology, which can improve the support and stability and help promote the bone healing process; and the support slider 6 can support the upper base plate 4 and the lower base plate 5, and the screw 2 is connected to the support slider 6, and the screw 2 is rotated by a special tool. When the screw 2 rotates, the support slider 6 can be driven to move forward and backward, and during the movement of the support slider 6, the upper base plate 4 and the lower base plate 5 can be driven to move up and down, so as to achieve the purpose of expanding the intervertebral fusion device. The expandable intervertebral fusion device can increase the contact area with the end plate and the bone scraps filling space, and can completely restore the convex curvature of the spine, and is suitable for various lumbar degenerative diseases requiring intervertebral fusion, and effectively improves the fusion rate and clinical treatment rate of the intervertebral fusion device and the human spine.

[0034] like Figure 2 and Figure 4 As shown, the support slider 6 is a rectangular parallelepiped structure, and V-shaped bosses 61 are correspondingly arranged on the front and rear sides thereof; a first through hole 62 matching the screw 2 is arranged at one end of the support slider 6, and a U-shaped groove 63 is arranged at the other end thereof; Figure 3 As shown, the upper base plate 4 and the lower base plate 5 both include a bottom plate 41, a front side plate 42 and a rear side plate 43 arranged on the bottom plate 41, the rear side plate 43 and the front side plate 42 both include a first baffle plate 44, a second baffle plate 45 and a third baffle plate 46, a first slide groove 47 is arranged between the first baffle plate 44 and the second baffle plate 45, a second slide groove 48 is arranged between the second baffle plate 45 and the third baffle plate 46, the second slide groove 48 and the first slide groove 47 have the same inclination direction, and both match the V-shaped boss 61; the upper base plate 4 and the lower base plate 5 are fixed by the support slider 6; when in use, the support slider The V-shaped boss 61 of the block 6 can be engaged and fixed with the first slide groove 47 and the second slide groove 48 on the upper base plate 4 and the lower base plate 5, so as to support and fix the upper base plate 4 and the lower base plate 5. When the supporting slider 6 is rotated by the screw 2, it can move forward and backward in the first slide groove 47 and the second slide groove 48, thereby driving the upper base plate 4 and the lower base plate 5 to move up and down, so as to realize the in-situ expansion of the intervertebral fusion device; and the expansion method is realized by the cooperation of the external thread and the internal thread, which can realize the self-fixation effect after expansion, avoid the vertebral body from settling, and improve the safety of use.

[0035] like Figure 6 As shown, a fifth through hole 21 is provided inside the screw 2, and the fifth through hole 21 is used to implant bone chips; and a porous structure layer 49 is provided on the base plate 41; the porous structure layer 49 is a three-dimensional structure similar to trabeculae, which can improve the fusion efficiency after implantation.

[0036] like Figure 5As shown, the frame 3 is arranged outside the supporting slider 6, which is a rectangular structure. A second through hole 31 matching the screw 2 is arranged at one end of the frame 3, and the second through hole 31 is arranged corresponding to the first through hole 62; a first plant hole 32 is arranged in the middle of the frame 3, and a second plant hole 33 is arranged correspondingly on the front and rear sides thereof; a third plant hole 64 is arranged in the middle of the supporting slider 6, and a fourth plant hole 65 is arranged correspondingly on the front and rear sides thereof; the frame 3 can further fix the upper base plate 4, the lower base plate 5 and the supporting slider 6, improve the stability of the intervertebral fusion device after implantation, and avoid vertebral settlement; and the first plant hole 32, the second plant hole 33, the third plant hole 64 and the fourth plant hole 65 can all provide filling space for bone chips, thereby increasing the fusion space and improving the fusion efficiency and quality.

[0037] like Figure 2 and Figure 5 As shown, a third through hole 34 is provided on one side of the first plant hole 32, and the third through hole 34 is provided on one side of the second through hole 31, and a fixing pin 35 is provided inside the third through hole 34; a fourth through hole 36 is provided on one side of the second plant hole 33, and the fourth through hole 36 is provided corresponding to the U-shaped groove 63, and a transverse pin 37 is provided inside the fourth through hole 36; the fixing pin 35 can fix the screw 2 to prevent the screw 2 from falling out, and the transverse pin 37 can support the support slider 6 to prevent the support slider 6 from falling off, and the fixing pin 35 and the transverse pin 37 can improve the stability of the intervertebral fusion device after implantation.

[0038] like Figure 1 , Figure 2 and Figure 5 As shown, the frame body 3 is further provided with a mounting groove 38, which is arranged between the second through hole 31 and the second plant hole 33; the mounting groove 38 is used to install and fix the intervertebral fusion device, thereby improving the implantation stability of the intervertebral fusion device in the human body.

[0039] In summary, the 3D printed expandable intervertebral fusion device provided by the utility model is made of 3D printing technology in the contact parts with the intervertebral disc, and the surfaces of the upper base plate 4 and the lower base plate 5 are designed with a three-dimensional porous structure similar to the cancellous bone structure, which can increase the fusion rate between the intervertebral fusion device and the human spine; at the same time, the intervertebral fusion device has a simple structure and is easy to operate. It is implanted in the intervertebral space of the human body in a contracted state and expanded in situ, which can increase the contact area with the end plate and the bone filling space, and can restore the lordotic curvature, has strong biomechanical stability, is suitable for various lumbar degenerative diseases requiring intervertebral fusion, and can effectively improve the clinical treatment effect.

Claims

1. A 3D printed expandable intervertebral fusion cage, characterized in that: The fusion device comprises a fusion device body (1), the fusion device body (1) comprising a screw (2), a frame (3), an upper base plate (4), a lower base plate (5), and a support slider (6) arranged between the upper base plate (4) and the lower base plate (5), the support slider (6) being a rectangular parallelepiped structure, and having V-shaped bosses (61) arranged on its front and rear sides respectively; one end of the support slider (6) is provided with a first through hole (62) matching the screw (2), and the other end of the support slider is provided with a U-shaped groove (63); The upper base plate (4) and the lower base plate (5) both comprise a bottom plate (41), a front side plate (42) and a rear side plate (43) arranged on the bottom plate (41); the rear side plate (43) and the front side plate (42) both comprise a first baffle plate (44), a second baffle plate (45) and a third baffle plate (46); a first slide groove (47) is arranged between the first baffle plate (44) and the second baffle plate (45); a second slide groove (48) is arranged between the second baffle plate (45) and the third baffle plate (46); the second slide groove (48) and the first slide groove (47) both match the V-shaped boss (61); the upper base plate (4) and the lower base plate (5) are engaged and fixed by a supporting slider (6); The frame body (3) is arranged outside the supporting sliding block (6) and is a rectangular parallelepiped structure. A second through hole (31) matching the screw (2) is arranged at one end of the frame body (3), and the second through hole (31) is arranged corresponding to the first through hole (62).

2. The 3D printed expandable intervertebral fusion cage according to claim 1, characterized in that: The frame (3) is provided with a first plant hole (32) in the middle, and second plant holes (33) are correspondingly provided on the front and rear sides thereof; the support sliding block (6) is provided with a third plant hole (64) in the middle, and fourth plant holes (65) are correspondingly provided on the front and rear sides thereof.

3. The 3D printed expandable intervertebral fusion cage according to claim 2, characterized in that: A third through hole (34) is provided on one side of the first plant hole (32), the third through hole (34) being provided on one side of the second through hole (31), and a fixing pin (35) is provided inside the third through hole; a fourth through hole (36) is provided on one side of the second plant hole (33), and the fourth through hole (36) is provided correspondingly to the U-shaped groove (63), and a transverse pin (37) is provided inside the fourth through hole.

4. The 3D printed expandable intervertebral fusion cage according to claim 2, characterized in that: The frame body (3) is also provided with a mounting groove (38), and the mounting groove (38) is arranged between the second through hole (31) and the second plant hole (33).

5. The 3D printed expandable intervertebral fusion cage according to claim 1, characterized in that: A porous structure layer (49) is provided on the bottom plate (41).

6. The 3D printed expandable intervertebral fusion cage according to claim 1, characterized in that: A fifth through hole (21) is provided inside the screw (2), and the fifth through hole (21) is used for implanting bone chips.

Images