CN211300524U - A 3D printed bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex - Google Patents

Abstract

The utility model discloses a 3D prints bionical anti-dislocation movable artifical cervical vertebra and intervertebral complex of connecting, include: the bionic vertebral body comprises a vertebral body with a hollow middle part, an upper joint socket is arranged at the upper part of the vertebral body, and a lower joint socket is arranged at the lower part of the vertebral body; the upper joint mortar is connected with the upper end plate through an upper end plate joint structure, and the lower part of the upper joint mortar is connected with the lower end plate through a lower joint structure; the utility model has enough supporting structure, and can provide stable support after the anterior cervical vertebrectomy; the utility model discloses a motion of self ball joint replaces the motion function of normal cervical vertebra, can remain the original activity degree of cervical vertebra to and the emergence of the adjacent segment patient of cervical vertebra that leads to after preventing to fuse the operation, and the utility model discloses have the anticreep bit architecture of matching, place the emergence of dislocation in the joint activity. The utility model discloses the implantation operation degree of difficulty is less, and the wound is little, the facilitate promotion.

Description

A 3D printed bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex

【Technical field】

The utility model relates to a 3D printing bionic anti-dislocation movable artificial cervical vertebra and an intervertebral connection complex.

【Background technique】

With the progress of the times and the transformation of work forms, the number of long-term desk workers is increasing year by year, and the aging trend of the social population is gradually increasing. Therefore, the incidence of cervical spine diseases (such as cervical spondylosis, vertebral body tumors, etc.) is increasing year by year. The focus of surgical treatment of cervical spine disorders is to relieve compression and at the same time restore the stability of the spine. Surgery requires removal of the pathological factors that cause compression of the spinal cord and nerve roots, and implantation of different types of spinal implants to achieve immediate stability and long-term maintenance. At present, cervical subtotal resection and decompression combined with vertebral fusion is one of the important methods for the treatment of cervical diseases. This procedure reaches the vertebral body and intervertebral disc through an anterior cervical approach, and uses a vertebral body spreader to spread the adjacent upper and lower vertebral bodies of the target vertebral body, remove the diseased intervertebral disc, and subtotally remove most of the vertebrae in the bilateral uncinate joints. The body and the posterior longitudinal ligament were implanted in the defect area, and an appropriate spinal implant was placed in the defect area and fixed with an anterior cervical plate. As a kind of fusion artificial vertebral body, titanium cage has sufficient supporting strength and good biocompatibility, and is one of the commonly used implants in cervical fusion. A large number of literatures have reported that subtotal cervical vertebral resection and decompression combined with titanium cage bone grafting and fusion can achieve good clinical results for corresponding patients (Moreland DB, Asch HL, Clabeaux DE, et al. Anterior cervical discectomy and fusion with implantable). titanium cage: initial impressions, patient outcomes and comparison to fusion with allograft. The spine journal: official journal of the North American Spine Society. 2004;4(2):184-191;discussion 191).

In 1969, Hamdi first reported the treatment of a patient with plasmacytoma and a patient with metastatic adenocarcinoma by using artificial vertebral bodies instead of resected vertebral bodies (Hamdi, F A. Prosthesis for an excised lumbar vertebra: apreliminary report. Can Med Assoc J, 1969, 100, 12:576-80.). Since then, scholars from various countries have carried out extensive research on artificial vertebral bodies. Artificial vertebral bodies are mainly divided into fusion artificial vertebral bodies and movable artificial vertebral bodies. Fusion artificial is a commonly used spinal implant in clinical practice. It has the advantages of good mechanical properties and strong immediate stability. For example, the lower cervical spine 3D printing titanium cage (He Xijing, Lu Teng, Dong Jun, etc.. Titanium cage [P]. China, CN204931903U, 2016-01-06), Winged adjustable replacement system (Sun Junkai, Liu Jinglong, Huang Jianhou. Application of adjustable replacement system with wings in fracture and dislocation of lower cervical spine (English) [J]. China Tissue Engineering Research, 2013, 17(22): 4025-4033.) et al. However, the study found that after implanting the fusion artificial vertebral body, the original normal physiological activity of the spine was lost, the stress in the adjacent intervertebral disc increased, and the activity of the adjacent intervertebral increased (Dmitriev AE, Cunningham BW, Hu NB, et al. Adjacent level intradiscal pressure and segmental kinematics following acervical total disc arthroplasty-An In Vitro human cadavericmodel.Spine.2005;30(10):1165-1172), (Hilibrand AS, Carlson GD, Palumbo MA, etal.Radiculopathy and myelopathy at segments adjacent to the site of aprevious anterior cervical arthrodesis. J Bone Joint Surg-Am Vol. 1999; 81A(4): 519-528.), which will cause degeneration of the adjacent intervertebral disc and vertebral bone hyperplasia in the long run (Phillips FM, ReubenJ, Wetzel ft. .Intervertebral disc degeneration adjacent to a lumbar fusion.Anexperimental rabbit model[J].J Bone Joint Surg Br,2002,84(2):289-294.)(Hilibrand AS,Robbins M.Adjacent segment degeneration and adjacent segmentdisease:the Consequences of spinal fusion? The spine journal: official journal of the North American Spine Society. 2004; 4(6Suppl):190S-194S). Some studies have found that after a two-year follow-up study, some scholars have found that compared with fusion surgery, maintaining cervical spine activity can effectively prevent the occurrence of symptomatic changes in the adjacent intervertebral vertebrae, and reduce the changes in the imaging indicators of the adjacent intervertebral vertebrae (Robertson JT, Papadopoulos SM, Traynelis VC). . Assessment of adjacent-segment disease in patients treated with cervical fusion or arthroplasty: a prospective 2-year study. Journal of Neurosurgery-Spine. 2005;3(6):417-423).

In order to preserve the original physiological mobility of the spine and reduce the possibility of diseases in the adjacent intervertebral vertebrae, the concept of non-fusion and mobility has gradually become the mainstream. Non-fusion surgery, such as artificial disc replacement, which only removes the diseased disc and replaces it with an artificial disc, is a typical example of non-fusion surgery. However, artificial intervertebral disc replacement has a narrow scope of adaptation, and is only suitable for the treatment of diseases with single-segment and physiological curvature of the cervical spine, and is not suitable for the existence of vertebral lesions and multi-stage lesions (Sekhon LH. [J]. J Spinal Disord Tech, 2003, 16(4):307-313). In order to solve the problems existing in non-fusion surgery, the movable artificial vertebral body has become a research hotspot. Common movable artificial vertebral bodies include Artificial disc and vertebra system (Dong,J,LU M,LU T,et al.Artificial disc and vertebra system:anovel motion preservation device for cervical spinal disease after vertebralcorpectomy[J].CLINICS, 2015, 70(7): 493-499.), artificial cervical joint complex (YU J, LIU LT, ZHAO JN. Design and preliminary biomechanical analysis ofartificial cervical joint complex[J]. Arch Orthop Trauma Surg, 2013, 133(6 ): 735-743.). However, these movable artificial vertebral bodies still have the following problems, such as insufficient protection of the movable articular surfaces, and the risk of joint dislocation; the structural design of the artificial vertebral body has too little contact surface with the bone, which is not conducive to the ingrowth of bone cells; the artificial vertebral body The fixed part is beyond the range of the vertebral body, which may cause compression and damage to local tissues and organs.

3D printing is a processing technology that prints and integrates models in layers through computer-aided design, based on digital models, through laser sintering, light curing, etc. The advantage of 3D printing technology is that it can process complex structures, and can design the appearance and structure individually. At the same time, it can save costs and improve production efficiency. It has a broad space for development in the field of orthopedics (Bose S, Vahabzadeh S, Bandyopadhyay A. using 3Dprinting.Mater Today.2013;16(12):496-504. Therefore, applying 3D printing to the design and manufacture of spinal implants can not only customize suitable implants according to patient information, but also greatly improve the Promote the performance improvement and innovation of implants.

【Content of utility model】

The purpose of the utility model is to solve the problems in the prior art, and to provide a 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex, which is based on The bionic design of human body data has sufficient support function, can retain the normal range of motion of the cervical spine, has an anti-dislocation structure, can provide enough space for bone grafting and bone contact surface, achieve immediate postoperative stability, and can also achieve anterior cervical spine surgery Immediately afterwards, the motor function is reconstructed, so that its activity performance is bionic with the normal cervical spine height, and this stability and motor function are maintained for a long time.

In order to achieve the above object, the utility model adopts the following technical solutions to be realized:

A 3D printed bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex, comprising:

an upper endplate, the bottom of the upper endplate is connected with the bionic vertebral body through the upper endplate joint structure;

a lower endplate, the top of the lower endplate is connected with the bionic vertebral body through the lower endplate joint structure;

A bionic vertebral body, the bionic vertebral body comprises a vertebral body with a hollowed-out middle, an upper joint socket is arranged on the upper part of the vertebral body, and a lower joint socket is arranged on the lower part; the upper joint socket is connected with the upper endplate through the joint structure of the upper endplate, and the lower part is The lower joint structure is connected with the lower end plate; the front and back of the vertebral body are provided with a number of diamond-shaped through holes, and the two sides are provided with bone graft windows;

An anti-dislocation structure, the anti-dislocation structure includes upper and lower limit teeth respectively arranged on the upper and lower acetabular sockets, and a number of and The positions of the first and second clamping grooves are corresponding to the upper limit teeth and the lower limit teeth; the upper limit teeth are equally spaced at the upper end table of the upper joint socket, and the lower limit teeth are equally spaced at the lower end table of the lower joint socket;

The upper endplate, the lower endplate and the bionic vertebral body are all made of 3D printing.

The further improvement of the present utility model is:

The upper end plate includes a first platform, the front section of the first platform is provided with a pair of first nail lanes with parallel axes and symmetrical divisions, the axes of the two first nail lanes and the plane of the first platform are provided with an included angle, for It is convenient to fix the screws; the upper surface of the first platform is provided with an arc-shaped support structure.

The two first nail lanes are opened in the front structure area of the first platform, the support structure is arranged in the rear structure area of the first platform, and the highest point of the arc of the support structure is located at the rear of the first platform, and the height of the arc surface is oriented toward the rear of the first platform. Smoothly decreasing around.

The lower end plate includes a second platform, and the front section of the second platform is provided with two pairs of second nail lanes with parallel axes and symmetrical divisions, and the axes of the two second nail lanes and the plane of the second platform are provided with an included angle, for Easy screw fixation.

The two second nail lanes are opened in the front structure area of the second platform.

The joint structure of the upper endplate includes a first joint ball handle, the top of the first joint ball handle is fixedly connected with the lower surface of the upper endplate, and the bottom is provided with a first joint ball, and the first joint ball is installed in the upper joint socket;

The joint structure of the lower endplate includes a second joint ball handle, the bottom of the second joint ball handle is fixedly connected with the upper surface of the lower endplate, and the top is provided with a second joint ball, which is installed in the lower joint socket.

The upper limit tooth is arranged on the top of the upper joint socket, the lower limit tooth is arranged on the bottom of the lower joint socket, and the free ends of the upper limit tooth and the lower limit tooth both point to the center of the joint socket; On one joint ball, the second locking grooves are formed on the second joint ball at equal intervals.

The inside of the vertebral body is provided with a support column, the support column is an inclined plane cylinder, the upper surface of which is connected with the bottom end of the upper joint socket, and extends smoothly to the surroundings, and the lower surface is connected with the topmost end of the lower joint socket. , and extend smoothly around.

The diamond-shaped through holes on the front of the vertebral body are provided with 4 layers, and each layer is arranged in a staggered manner;

Compared with the prior art, the utility model has the following beneficial effects:

The utility model has sufficient supporting structure, and can provide stable support after the anterior cervical vertebrectomy; the utility model replaces the motion function of the normal cervical vertebra through the motion of the self-ball joint, can retain the original range of motion of the cervical vertebra, and prevent fusion The occurrence of patients with adjacent segments of the cervical vertebrae after surgery, and the utility model has a matching anti-dislocation structure, which is placed in the event of dislocation during joint activities. In addition, the present invention has a bone graft window and a bone graft space, which can accelerate biological fusion and maintain long-term stability through intraoperative bone grafting. The implantation operation of the utility model is less difficult, less traumatic, and convenient to popularize. Personalization with 3D printing can reduce the burden of production and carrying, and can provide suitable implants.

Further, the upper surface support structure of the upper endplate of the present utility model is designed in an arc shape according to the human body information data, which conforms to the concave shape of the surface of the lower endplate of the human cervical vertebra, increases the contact area between the upper endplate and the lower surface of the upper vertebral body, and reduces the cervical vertebral body. Under the pressure, the stability is enhanced.

Further, the utility model relies on the screw channels in the upper and lower endplate platform structures, and can be self-fixed on the adjacent vertebral bodies without the assistance of anterior steel plates; and the screw channels are located in the artificial vertebral body structure, and there will be no local damage after fixation. Occupying space without affecting the function of adjacent organs (such as esophagus, trachea, etc.).

Further, the utility model is provided with clamping grooves on the surfaces of the upper and lower joint balls, which are matched with the anti-dislocation structures on the tops of the upper and lower joint sockets of the vertebral body parts. When the upper and lower endplates are installed into the joint socket along the grooves, and the rotating endplates reach the proper position, the anti-dislocation structure will prevent the joint ball from coming out.

Further, in the utility model, both sides of the vertebral body part are provided with bone graft windows, and the center is hollowed out to provide space for surgical bone graft, which is beneficial to improve fusion.

Further, there is a load-bearing column in the middle of the vertebral body part of the present invention, which can improve the overall mechanical performance, provide sufficient stability, and can reduce the amount of peripheral materials and further improve the internal bone grafting space.

Further, there is a load-bearing column in the middle of the vertebral body part of the present invention, and the angle is inclined by 10° from front to back, which is combined with the intervertebral angle of the human cervical vertebra, which is beneficial to maintain the normal physiological structure.

【Description of drawings】

Fig. 1 is the overall structure isometric schematic diagram of the present utility model;

Fig. 2 is the structural representation of the upper end plate of the present invention;

Fig. 3 is the front view of Fig. 2;

Fig. 4 is the side view of Fig. 2;

Fig. 5 is the bottom view of Fig. 2;

Figure 6 is a side view of the lower endplate of the present invention;

Fig. 7 is the front view of the vertebral body part of the present utility model;

Figure 8 is a side view of the vertebral body part of the present invention;

Fig. 9 is the top view of the vertebral body part of the present invention;

10 is a side half-section view of the overall structure of the present invention;

Fig. 11 is the overall structure side view of the present utility model;

Figure 12 is a top view of the overall structure of the present invention.

Among them: 1-upper endplate; 2-bionic vertebral body; 3-lower endplate; 4-first platform; 5-support structure; 6-first screw channel; 7-first joint ball handle; 8-first Ball joint; 9-first slot; 10-upper articular socket; 11-upper limit tooth; 12-vertebral body; 13-support column; 14-bone graft window; 15-lower articular cavity; 16-lower limit tooth ; 17 - the second slot; 18 - the second platform; 19 - the second screw channel; 20 - the second joint ball handle; 21 - the second joint ball.

【Detailed ways】

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the disclosure of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. The figures are not to scale, some details have been exaggerated for clarity, and some details may have been omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are only exemplary, and in practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art should Regions/layers with different shapes, sizes, relative positions can be additionally designed as desired.

In the context of this disclosure, when a layer/element is referred to as being "on" another layer/element, it can be directly on the other layer/element, or intervening layers may be present therebetween /element. In addition, if a layer/element is "on" another layer/element in one orientation, then when the orientation is reversed, the layer/element can be "under" the other layer/element.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. . It is to be understood that the data so used may be interchanged under appropriate circumstances so that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

Below in conjunction with accompanying drawing, the utility model is described in further detail:

1, the utility model 3D prints a bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex, including an upper endplate 1, a lower endplate 3, a bionic vertebral body 2 and an anti-dislocation structure. The upper endplate 1, the lower endplate 3 and the bionic vertebral body 2 are all made of 3D printing.

结构区，支撑结构5设置于第一平台4的后

结构区，且支撑结构5的圆弧最高点位于第一平台4的后

处，弧面高度向四周平滑递减。上终板关节结构包括第一关节球柄7，第一关节球柄7的顶部与上终板1的下表面固定连接，底部设置第一关节球8，第一关节球8安装于上关节臼10中；The bottom of the upper endplate 1 is connected with the bionic vertebral body 2 through the upper endplate joint structure; the upper endplate 1 includes a first platform 4, and the front section of the first platform 4 is provided with a pair of axis-parallel and symmetrically divided first screw tracks 6 , the axes of the two first screw lanes 6 and the plane of the first platform 4 are provided with an included angle, which is used to facilitate the fixing of screws; Two first nail lanes 6 are opened in front of the first platform 4

In the structure area, the support structure 5 is arranged behind the first platform 4

structure area, and the highest point of the arc of the support structure 5 is located behind the first platform 4

, the height of the arc surface decreases smoothly to the surrounding. The joint structure of the upper endplate includes a first joint ball handle 7, the top of the first joint ball handle 7 is fixedly connected with the lower surface of the upper endplate 1, the bottom is provided with a first joint ball 8, and the first joint ball 8 is installed in the upper joint socket. 10;

结构区。下终板关节结构包括第二关节球柄20，第二关节球柄20的底部与下终板3的上表面固定连接，顶部设置第二关节球21，第二关节球21安装于下关节臼10中。The top of the lower endplate 3 is connected with the bionic vertebral body 2 through the lower endplate joint structure; the lower endplate 3 includes a second platform 18, and the front section of the second platform 18 is provided with two pairs of axis-parallel and symmetrically divided second screw tracks 19 , the axes of the two second screw channels 19 and the plane of the second platform 18 are provided with an included angle, which is used to facilitate the fixing of screws. Two second nail lanes 19 are opened in front of the second platform 18

structural area. The joint structure of the lower endplate includes a second joint ball handle 20, the bottom of the second joint ball handle 20 is fixedly connected with the upper surface of the lower endplate 3, the top is provided with a second joint ball 21, and the second joint ball 21 is installed in the lower joint socket 10 out of 10.

The bionic vertebral body 2 includes a vertebral body 12. The upper part of the vertebral body 12 is provided with an upper joint socket 10, and the lower part is provided with a lower joint socket 15; The structure is connected with the lower end plate 3; the front and back of the vertebral body 12 are provided with a number of diamond-shaped through holes, and the side is provided with a bone graft window 14; the vertebral body 12 is provided with a support column 13, and the support column 13 is a slanted cylindrical body. The upper surface is connected to the bottommost end of the upper articular socket 10 and smoothly extends to the surroundings, and the lower surface is connected to the topmost end of the lower articular socket 15 and smoothly extends to the surroundings.

The anti-dislocation structure includes an upper limit tooth 11 and a lower limit tooth 16 respectively arranged on the upper joint socket 10 and the lower joint socket 15, and several numbers and positions of the joint structure of the upper end plate and the joint structure of the lower end plate are respectively arranged. The first slot 9 and the second slot 17 corresponding to the upper limit tooth 11 and the lower limit tooth 16; the upper limit tooth 11 and the lower limit tooth 16 are equally spaced at the upper end table of the joint socket; the upper limit tooth 11 is arranged on the upper The top of the joint socket 10, the lower limit tooth 16 is arranged on the bottom of the lower joint socket 15, and the free ends of the upper limit tooth 11 and the lower limit tooth 16 both point to the center of the joint socket; the first snap grooves 9 are opened at equal intervals in the first joint On the ball 8 , the second locking grooves 17 are formed on the second joint ball 21 at equal intervals.

The structural principle of the present utility model is as follows:

The utility model 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex is mainly composed of three components: a bionic vertebral body 2, and an upper endplate 1 and an upper endplate 1 connected to the bionic vertebral body 2 through a joint ball structure respectively Lower endplate 3. The bionic vertebral body 2 is composed of an upper articular socket 10, a vertebral body body 12, a lower articular socket 15, and a support column 13; both the upper articular socket 10 and the lower articular socket 15 include anti-dislocation structures; the vertebral body 12 includes a lateral bone graft window 14 ; The upper end plate 1 and the lower end plate 3 are composed of a platform, a joint ball handle and a joint ball; the first platform includes a support structure 5 and a pair of first screw channels 6; the joint ball of the upper end plate and the lower end plate The structures all contain card slots opened on their surfaces.

The upper endplate 1 constitutes the upper surface of the 3D printed bionic anti-dislocation movable artificial cervical vertebra and the intervertebral connection complex of the present invention. The two nail lanes are symmetrically located in the front 1/4 structure area of the first platform 4, and the axis is at a certain angle with the plane of the first platform, allowing screws to be fixed; the upper support structure 5 is located on the upper surface of the rear 3/4 structure area of the first platform 4 , in the shape of a circular arc, the highest point is located at the rear 4/7 of the first platform 4, and decreases to the front, back and sides.

The joint structure of the upper endplate is composed of a cylinder, which is connected with the center of the rear 3/4 structure area of the lower surface of the first platform 4 . The joint structure of the upper endplate includes a first joint ball 8 and three first snap grooves 9. The upper surface of the first joint ball 8 is connected with the center of the lower surface of the first joint ball handle 7; It is a cuboid groove-like structure, and is distributed on the surface of the first joint ball 8 at equal intervals.

The bionic vertebral body 2 includes a vertebral body body 12 , an upper joint socket 10 is arranged on the top of the vertebral body body 12 , three upper limit teeth 11 are arranged on the upper joint socket 10 , and the three upper limit teeth 11 are equally spaced at the upper end of the upper joint socket 10 . At the table top, the upper anti-dislocation structure is formed with the three first card slots 9; the upper joint socket 10 is composed of an arc surface, and the upper part is a water platform surface. The bottom of the vertebral body 12 is provided with a lower joint socket 15 , and three lower limit teeth 16 are arranged on the lower joint socket 15 . The lower part of the anti-dislocation structure is formed; the lower joint socket 15 is composed of an arc surface, and the lower part is a water platform surface.

The front of the vertebral body 12 is composed of 4 layers of staggered rhombus structures, and each layer has 3 rhombus; the back is composed of 3 layers of staggered rhombus structures, each of which has 3 rhombus; the side is the bone graft window 14; the vertebral body 12 is upward Connected to the upper articular socket.

The inside of the vertebral body 12 is provided with a support column 13. The support column 13 is composed of an inclined plane cylinder. The upper surface is connected with the lowest end of the upper articular socket 10 and extends around, and the lower surface is connected with the uppermost end of the lower articular socket 15 and extends around.

The lower endplate 3 constitutes the lower surface of the 3D printed bionic anti-dislocation movable artificial cervical vertebra and the intervertebral connection complex of the present invention. The two screw lanes are symmetrically located in the front 1/4 structural area of the second platform 18, and the axes are at a certain angle with the plane of the second platform 18, allowing screw fixation.

The joint structure of the lower endplate is composed of a cylinder, which is connected with the center of the rear 3/4 structure area of the upper surface of the second platform 18 . The joint structure of the lower endplate includes a second joint ball 21 and three second snap grooves 17, the lower surface of the second joint ball 21 is connected with the center of the lower surface of the second joint ball handle 20; the three second snap grooves 17 are all It is a cuboid groove-like structure, and is distributed on the surface of the second joint ball 21 at equal intervals.

The joint ball structure of the utility model includes the joint ball structures of the upper and lower end plates, and the upper and lower joint sockets whose upper and lower ends of the bionic vertebral body 2 are adapted to the joint balls. The upper and lower limit teeth of the anti-dislocation structure are respectively arranged at the top and bottom of the hemispherical space, the first and second joint balls are enclosed in the corresponding hemispherical space, and the locking grooves on the surface of the joint balls cooperate with the limit teeth to restrict their dislodgement .

Example:

1, 10, 11 and 12, in this embodiment, the height of the anterior edge of the 3D printed bionic anti-dislocation cervical vertebra artificial vertebral body is 23mm, the height of the posterior edge is 21mm, and the maximum vertical height along the support structure 5 is 25mm , the highest point above is located at the rear 3/7, gradually decreasing to both sides, the lowest point below is located at the front, the length of the front and rear diameter is 15mm, and the left and right diameter is 13mm.

As shown in Figures 2, 3, 4, 5 and 10, in this embodiment, the height of the first platform 4 is 2 mm, the front and rear lengths are 15 mm, and the width is 13 mm; The highest point is located in the rear 4/7, the height is 1.3mm, and it decreases to the front and rear and both sides; the two first nail tracks 6 are cylindrical with a diameter of 3mm, symmetrically located in the front 1/4 structure area of the first platform 4, and the axis is the same as the The flats are at a 40° angle, allowing screw fixation. The first joint ball handle 7 is a cylinder with a diameter of 7 mm and a height of 3 mm, and is connected to the rear 3/4 structure area of the lower surface of the first platform 4 . The circular surface of the first joint ball 8 has a diameter of 9 mm and a height of 2.5 mm, and is connected with the lower surface of the first joint ball handle 7 . The three first card slots 9 are all cuboid slot-like structures with a length of 1 mm, a width of 0.75 mm and a height of 2.5 mm, and are distributed on the surface of the first joint ball 8 at an interval of 60°. The significance of the support structure 5 is to fit with the curved surface of the lower endplate of the upper vertebral body, increase the contact area, reduce the pressure on the lower surface of the cervical vertebral body, and effectively prevent the occurrence of bone destruction. The first nail track 6 is opened on the first platform 4 of the upper endplate 1, and is a self-fixation method, which does not require additional steel plate fixation, thereby reducing the damage to surrounding tissues. The first clamping slot 9 is adapted to the anti-dislocation structure, and is a combined installation channel of the upper endplate 1 and the bionic vertebral body 2 .

As shown in Figures 2, 3, 4, 5, 6 and 10, in this embodiment, the height of the second platform 18 is 2mm, the front and rear lengths are 15mm, the width is 13mm, and the two second nail channels 19 are cylindrical with a diameter of 3mm. , symmetrically located in the front 1/4 structure area of the second platform 18, the axis and the plane are at an angle of 40°, allowing screw fixation. The second joint ball handle 20 is a cylinder with a diameter of 7 mm and a height of 3 mm, and is connected with the rear 3/4 structure area of the upper surface of the second platform 18 . The circular surface of the second joint ball 21 has a diameter of 9 mm and a height of 2.5 mm, and is connected with the upper surface of the second joint ball handle 20 . The three second card slots 17 are all rectangular parallelepiped slot structures with a length of 0.75mm, a width of 0.5mm and a height of 2.5mm, and are distributed on the surface of the second joint ball 21 at intervals of 60°. The second nail channel 19 is located inside the second platform 18 of the upper endplate 1, and is a self-fixation method, which does not require additional steel plate fixation, thereby reducing the damage to the surrounding tissue. The second locking groove 17 is matched with the anti-dislocation structure, and is a combined installation channel of the lower endplate 3 and the bionic vertebral body 2 .

As shown in Figs. 2, 6, 7, 8, 9 and 10, in this embodiment, the upper articular socket 10 and the lower articular socket 15 are both composed of the same arc surface as the articular ball, the thickness is 1 mm, and the upper part is horizontal. The anti-dislocation structure is composed of three cubes with a side length of 1mm, with a distance of 60° distributed on the end table of the articular acetabular arc surface, and a distance of 1mm from the articular ball. The height of the front edge of the vertebral body 12 is 15mm, the height of the rear edge is 12mm, the front and rear length is 9mm, and the left and right width is 10mm. Each layer has 3 rhombus; each side has a bone graft window 14 . The anti-dislocation structure is matched with the first locking groove 9 to prevent the upper endplate 1 and the lower endplate 3 from being dislodged from the corresponding articular socket after installation. The vertebral body 12 is of hollow design, and the hollow design increases the contact area between the implanted bone particles and the surrounding bone, which is beneficial to the early fusion of the bone in the operation area and improves the long-term stability. The diameter of the bone graft window 14 is large, which is convenient for the intraoperative bone graft operation. The support column 13 is a sloping cylinder with a diameter of 4 mm, and is respectively connected with the arc surface at the top end of the upper joint socket 10 and the arc surface at the bottom end of the lower joint socket 15 . The vertebral body 12 and the support column 13 can be adjusted according to different personal imaging data.

2 , 3 , 4 , 5 , 6 , 9 and 10 , the inner space of the first articular socket 10 and the second articular socket 15 is large, and has a space capable of accommodating and moving the first joint ball 8 and the second joint ball 21 . space. The above endplate 1 is taken as an example, during installation, align the first slot 9 with the upper limit tooth 11 on the first joint socket 10, install it along the first slot 9, and rotate the upper endplate 1 by 60° to meet the required standard location, as shown in Figure 1. The first joint ball 8 is wrapped in the second joint socket 10 and is restricted by the anti-dislocation structure to prevent the prolapse of the artificial vertebral body endplate and reserve enough space for movement. The installation process of the lower end plate 3 is the same as that of the upper end plate 1 .

Because the height of the cervical spine varies among the population, 5 different models were designed according to the imaging data to meet the needs of different implant heights. Including the largest size, large size, standard size, small size, minimum size 5 kinds of models. The standard model is the above-mentioned embodiment, and the largest model is based on the standard model, the vertebral body 12 and the support column 13 are lengthened by 2 mm. For the large size, the vertebral body 12 and the support column 13 are lengthened by 1mm on the basis of the standard model. For the small size, the vertebral body 12 and the support column 13 are reduced by 1mm on the basis of the standard model. The smallest size is to reduce the vertebral body 12 and the support column 13 by 2mm on the basis of the standard size.

To sum up, the utility model is a 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex, which is suitable for diseases requiring subtotal cervical vertebral body resection and decompression combined with implant fusion, especially suitable for Cervical vertebral diseases with two spaces in a single vertebral body, such as cervical spondylosis caused by two-segment cervical intervertebral disc herniation, cervical single vertebral tumor, and revision after artificial cervical intervertebral disc replacement, etc.

The specific implementations of intervertebral disc removal, subtotal vertebral body resection, this movable artificial cervical vertebra and intervertebral connection complex implantation will be described below:

For patients with indications, complete preoperative examinations, and patients without contraindications should undergo preoperative exercises such as defecation and urination in bed, and then undergo the surgical treatment. The patient was placed in a supine position, with a soft pillow under the shoulders, a soft headband on the back of the pillow, and a small sandbag on each side of the head. Routine preoperative preparation, endotracheal intubation under general anesthesia, and sterile drape in the neck area. An anterior transverse incision was used to separate the soft tissue layer by layer, and the trachea and esophagus were pulled and protected with retractors. Expose the target vertebral body area, install a positioning needle, and use a C-arm X-ray fluoroscopy machine to locate and confirm the target vertebral body. Install cervical vertebral body spreader screws on the upper and lower vertebral bodies of the target vertebral body, and the spreader opens. The annulus fibrosus of the intervertebral disc is incised above and below the target vertebral body, and the intervertebral disc tissue is removed using a nucleus pulposus forceps. The anterior vertebral body was excised with a rongeur, and the intervertebral articular surfaces were repaired with a curette, rongeur, and rasp, but without destroying the bony endplate. The space between the posterior edge of the vertebral body and the posterior longitudinal ligament was separated with a nerve dissector, and the cortical bone at the posterior edge of the vertebral body and the ossified posterior longitudinal ligament were excised with a rongeur. Slot for decompression to form a rectangular decompression groove with a width of approximately 13mm. The composite body of suitable height is selected, the cut vertebral body bone is cut into pieces with a size of about 2mm, and the internal hollow structure is filled from the bone graft windows on both sides of the artificial vertebral body. The upper and lower endplates are installed, and the angle is adjusted to prevent prolapse, and the complex is placed so that the upper endplate fits with the lower endplate of the upper vertebral body, and the lower endplate fits with the upper endplate of the lower vertebral body. Screw in 2 vertebral body fixation screws up and down to fix the complex. Loosen the vertebral body spacer to tighten the complex. The position of the implant was confirmed by C-arm X-ray fluoroscopy, the wound was flushed with normal saline, drainage was placed, and sutured layer by layer. Routine postoperative care, drainage and drainage were removed 1 day later, and the cervical collar was immobilized for 3 months.

The above content is only to illustrate the technical idea of the present utility model, and cannot limit the protection scope of the present utility model. Any changes made on the basis of the technical solution according to the technical idea proposed by the present utility model fall into the scope of the present utility model. within the scope of protection of the claims.

Claims (9)

1. The utility model provides a 3D prints bionical anti-dislocation movable artificial cervical vertebra and intervertebral complex of connecting which characterized in that includes:

the bottom of the upper end plate (1) is connected with the bionic vertebral body (2) through an upper end plate joint structure;

the top of the lower end plate (3) is connected with the bionic vertebral body (2) through a joint structure of the lower end plate;

the bionic vertebral body (2) comprises a vertebral body (12) with a hollow middle part, an upper joint socket (10) is arranged at the upper part of the vertebral body (12), and a lower joint socket (15) is arranged at the lower part of the vertebral body; the upper joint mortar (10) is connected with the upper end plate (1) through an upper end plate joint structure, and the lower part of the upper joint mortar is connected with the lower end plate (3) through a lower joint structure; the front and the back of the vertebral body (12) are provided with a plurality of rhombic through holes, and two side surfaces are provided with bone grafting windows (14);

the anti-dislocation structure comprises an upper limiting tooth (11) and a lower limiting tooth (16) which are respectively arranged on the upper joint mortar (10) and the lower joint mortar (15), and a plurality of first clamping grooves (9) and second clamping grooves (17) which are respectively arranged on the upper end plate joint structure and the lower end plate joint structure, wherein the number and the positions of the first clamping grooves and the second clamping grooves correspond to the upper limiting tooth (11) and the lower limiting tooth (16); the upper limiting teeth (11) are distributed on the table top at the upper end of the upper joint mortar (10) at equal intervals, and the lower limiting teeth (16) are distributed on the table top at the lower end of the lower joint mortar (15) at equal intervals;

the upper end plate (1), the lower end plate (3) and the bionic vertebral body (2) are all made by 3D printing.

2. The 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex body according to claim 1, wherein the upper end plate (1) comprises a first platform (4), a pair of first nail paths (6) with parallel axes and symmetrical subsections are arranged at the front section of the first platform (4), and included angles are formed between the axes of the two first nail paths (6) and the plane of the first platform (4) for facilitating the fixation of screws; and the upper surface of the first platform (4) is provided with a circular arc-shaped supporting structure (5).

3. The 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex body as claimed in claim 2, wherein the two first nail paths (6) are arranged in front of the first platform (4)

A structural zone, the support structure (5) being arranged behind the first platform (4)

Structural zone, and the highest point of the arc of the support structure (5) is located behind the first platform (4)

And the height of the cambered surface is smoothly decreased towards the periphery.

4. The 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex body according to claim 1, wherein the lower end plate (3) comprises a second platform (18), two pairs of second nail paths (19) with parallel axes and symmetrical subsections are formed at the front section of the second platform (18), and an included angle is formed between the axes of the two second nail paths (19) and the plane of the second platform (18) so as to facilitate the fixation of screws.

5. The 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex body as claimed in claim 4, wherein the two second nail paths (19) are arranged in front of the second platform (18)

And a structural region.

6. The 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex body according to claim 1, wherein the upper end plate joint structure comprises a first joint ball handle (7), the top of the first joint ball handle (7) is fixedly connected with the lower surface of the upper end plate (1), a first joint ball (8) is arranged at the bottom of the first joint ball handle, and the first joint ball (8) is installed in an upper joint socket (10);

the lower end plate joint structure comprises a second joint ball handle (20), the bottom of the second joint ball handle (20) is fixedly connected with the upper surface of the lower end plate (3), a second joint ball (21) is arranged at the top of the second joint ball handle, and the second joint ball (21) is arranged in a lower joint mortar (15).

7. The 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex as claimed in claim 6, wherein the upper limit teeth (11) are arranged at the top of the upper joint socket (10), the lower limit teeth (16) are arranged at the bottom of the lower joint socket (15), and the free ends of the upper limit teeth (11) and the lower limit teeth (16) point to the center of the joint socket; the first clamping grooves (9) are arranged on the first joint balls (8) at equal intervals, and the second clamping grooves (17) are arranged on the second joint balls (21) at equal intervals.

8. The 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex as claimed in claim 1, wherein a support pillar (13) is arranged inside the vertebral body (12), the support pillar (13) is a bevel cylinder, the upper surface of the support pillar is connected with the bottommost end of the upper joint socket (10) and extends smoothly to the periphery, and the lower surface of the support pillar is connected with the topmost end of the lower joint socket (15) and extends smoothly to the periphery.

9. The 3D printing bionic anti-dislocation movable artificial cervical vertebra and intervertebral connection complex as claimed in claim 1, wherein the diamond-shaped through holes on the front surface of the vertebral body (12) are provided with 4 layers, and each layer is provided with 3 staggered layers; the back is provided with 3 layers, 3 staggered arrangements in each layer.

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