CN108578020A - 3D printing artificial vertebral body inner fixing device - Google Patents

Abstract

The invention relates to a spinal stabilizer, in particular to a 3D printing artificial vertebral internal fixation device. It includes an extendable part and 3D printing parts located at both ends of the extendable part. The extendable part includes an outer sleeve and support platforms respectively located at both ends of the outer sleeve. The 3D printing part is located on the outside of the support platform and is fixedly connected to the support platform. The wall of the outer sleeve includes the outer wall of the sleeve and the inner wall of the sleeve. The shaped holes are arranged symmetrically with respect to the axis of the outer sleeve. The device adopts 3D printing and non-3D printing module assembly, and develops a simple and mechanically stable extendable method. The 3D printing part and the non-3D printing part have different models, and different models can be modularly assembled , help save printing materials, shorten printing time, increase intraoperative flexibility, reduce the gap between artificial vertebral body and bone interface, promote fusion, and benefit long-term stability.

Description

3D printed artificial vertebral internal fixation device

technical field

The invention relates to a spinal stabilizer, in particular to a 3D printing artificial vertebral internal fixation device.

Background technique

Spinal vertebral tumors, fractures, infections and other lesions are difficult points in the treatment of spinal surgery. The treatment level of the above diseases is an important reflection of the level of spinal surgery in each medical unit. In recent years, with the significant improvement in the level of spine surgery in my country, the treatment of spinal vertebral tumors, fractures, infections and other lesions has also achieved rapid development. At the same time, the improvement of clinical level has also promoted the development of scientific research innovation, especially with the application and development of 3D printing technology in various fields, it has provided new ideas and possibilities for the treatment of traditional diseases.

Surgical treatment of spinal vertebral tumors, fractures, infections and other lesions. The main steps are decompression and fixation. In the decompression stage, the tumors, diseased bones, and infection lesions are mainly removed through the doctor's surgical skills, and the damage to the spinal cord, nerves and other peripheral organs is relieved. Compression, this part of the surgical techniques and skills are relatively mature, and the fixation phase mainly maintains the immediate and long-term stability of the spine through implants. Among the implants used for fixation, the artificial vertebral body is widely used. As a substitute for the vertebral body, the artificial vertebral body can restore the physiological and anatomical structure of the spine, and has a better effect on spinal reconstruction than other implants.

With the development of spinal vertebral body reconstruction and fusion technology, more and more biomechanical tests and clinical applications show that the existing artificial vertebral bodies still have the following defects in treatment: (1) metal artificial vertebral bodies and upper and lower vertebral bodies Reliable fusion cannot be formed between bones, and the interface gap between metal and bone cannot be eliminated, resulting in implant prolapse, settlement, loosening, etc., and poor long-term stability; (2) Poor matching, due to individual differences in different patients' diseases and bones (such as differences in tumor size and bone length), resulting in differences in the size of the parts that need to be reconstructed after bone resection, requiring individualized artificial vertebral bodies, but the existing artificial vertebral bodies cannot meet individual differences, and artificial vertebral bodies often occur during surgery. If the vertebral body does not meet the needs of the patient, it will affect the surgical effect; (3) The length of the existing artificial vertebral body is uncontrollable, and it cannot take into account the convenience of placement and the close contact with the interface. If the artificial vertebral body is the same size as the space left after the lesion is removed, Although the interface between the bone and the artificial vertebral body is in close contact, it is inconvenient to place; if the artificial vertebral body is smaller than the space left after the resection of the lesion, although it is convenient to place, the interface between the bone and the artificial vertebral body is in close contact and there will be gaps; if the artificial vertebral body If it is slightly larger than the space left after the resection of the lesion, it will facilitate the close contact of the interface after placement, but it is difficult to put in; (4) if it cannot be properly distracted during the operation, it will not be possible to make the bone and the artificial vertebral body in close contact.

Some scholars are aware of the above problems and have actively explored, such as extending the artificial vertebral body to realize the controllable length of the vertebral body, but most of them have the disadvantages of complex extension mechanism, low mechanical strength, and poor stability. The vertebral body can ensure close contact with the bone interface, but the metal-bone interface has poor compatibility, cannot form reliable fusion, and has poor long-term stability.

Some scholars consider 3D printing trabecular vertebral bodies to promote the ingrowth of trabecular bone, which can achieve long-term bony fusion, but the current technical solution needs to be temporarily designed and printed according to the length of the patient's bone, which takes a long time and the patient's operation time is long. It takes a long time to wait before, and once the printing is completed, the size is fixed and cannot be adjusted during the operation. Once the tumor resection range exceeds the expected range during the operation, the artificial vertebra will not match the patient; at the same time, the current 3D printed trabecular bone vertebra The body cannot be stretched and pressurized to both sides, making it difficult to put in and the interface contact with the bone is not tight, which affects the fusion.

To sum up, the existing artificial vertebral bodies cannot realize the differentiated manufacturing of 3D printing and non-printing modularization, cannot realize the organic integration of 3D printing customization and flexible intraoperative extension adjustment, and cannot achieve the organic integration of individualized and standardized manufacturing. Product registration, specification delineation, and individualized use of plants bring difficulties, resulting in waste of materials, long printing time, and loss of intraoperative flexibility.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and propose a 3D printing artificial vertebral internal fixation device, which adopts 3D printing and non-3D printing module assembly, and develops a simple and mechanically stable Extendable way, 3D printing part and non-3D printing part have different models, and different models can be modularized, which is beneficial to save printing materials, shorten printing time, increase intraoperative flexibility, and reduce the interface between artificial vertebral body and bone Gap, promote integration, and benefit long-term stability.

The technical solution of the present invention is: a 3D printing artificial vertebral internal fixation device, which includes an extendable part and 3D printed parts located at both ends of the extendable part. Supporting platforms at both ends, the 3D printed part is located on the outside of the supporting platform and is fixedly connected to the supporting platform;

The wall of the outer sleeve includes the outer wall of the sleeve and the inner wall of the sleeve. The outer wall of the sleeve is polygonal. The holes are arranged symmetrically with respect to the axis of the outer sleeve;

The support platform includes a platform and an inner core, the platform is fixedly connected to the 3D printing part, the middle part of one side of the platform is fixedly connected to the inner core, two ends of the platform are symmetrically provided with platform fixing screw holes, and the platform fixing screw holes are provided with internal threads. The internal threads intermesh with the external threads of the longitudinal locking screw;

The inner core is arranged in the outer sleeve, the outer surface of the inner core is provided with threads, the outer threads of the inner core and the inner threads of the outer sleeve are engaged with each other, and the rotation direction of the outer threads of the two inner cores at both ends of the outer sleeve On the contrary, the inner core is provided with several locking holes along its axial direction, the locking holes are arranged symmetrically with respect to the axis of the inner core, the locking holes are provided with internal threads, and the internal threads of the locking holes engage with the external threads of the lateral locking screw;

The 3D printed part includes a skeleton and a 3D printed bone trabecular support structure filled in the skeleton. The skeleton includes a support reinforcement skeleton, a chassis, a hole wall of a bone fixing screw hole, and a hole wall of a platform fixing hole. There are internal threads, the internal threads of which mesh with the external threads of the longitudinal locking screw, the longitudinal locking screw realizes the fixed connection between the support platform and the 3D printing part, the wall of the bone fixing screw hole is provided with internal threads, and the internal thread and the bone The external threads of the screws engage with each other, and the bone screws realize the fixed connection between the 3D printed part and the bone.

In the present invention, the supporting and strengthening frame includes an annular closed frame and reinforcing ribs, the annular closed frame is arranged parallel to the chassis, and the annular closed frame and the chassis are connected by several reinforcing ribs arranged at intervals, and the hole wall of the platform fixing hole Located at both ends of the chassis, one end of the platform fixing hole wall is fixedly connected to the chassis, and the other end is fixedly connected to the ring-shaped closed frame. There are several bone fixing screw hole walls between the two platform fixing hole walls. The hole wall is inclined, one end is located on the side of the 3D printed part, the other end is located on the top surface corresponding to the chassis, one end of the bone fixing screw hole wall is fixedly connected with the rib on the side of the 3D printed part, and the bone fixing screw hole The other end of the hole wall is fixedly connected with the end of the platform fixing hole wall.

The side of the platform in contact with the chassis is provided with several reinforced concave parts, correspondingly, several reinforced convex parts are provided on the bottom surface of the chassis, the reinforced convex parts are arranged correspondingly to the reinforced concave parts on the platform, and the reinforced convex parts are arranged in the reinforced concave parts to enhance A stable connection between the chassis and the platform is achieved.

The 3D printed trabecular bone scaffold structure is a topological microporous structure, and the micropores communicate with each other. The pores of the microporous structure have a pore diameter of 100-1200 μm and a porosity of 40%-88%.

In the middle part of the 3D printed trabecular bone support structure, there may be several pores or channels for implanting allograft bone or autologous bone, correspondingly, channels for bone grafting are provided on the chassis, and at the same time, there are channels on the support platform The inner core is provided with a channel communicating with the 3D printed bone graft channels at both ends, which is beneficial to the integrated healing of the bone graft material.

The bone screw comprises a bone screw head, a bone screw shaft and a bone screw tail, the head of the bone screw shaft is fixedly connected to the bone screw head, the bottom of the bone screw shaft is fixedly connected to the bone screw tail, and the bone screw head is connected to the bone screw shaft. Bone screw mechanical threads are provided at the joint, bone screw screwdriver holes are provided on the top end of the bone screw head, the bone screw mechanical threads mesh with the internal threads of the bone fixation screw holes of the 3D printed parts at both ends, and the bone screw rods are provided with external threads .

The transverse locking screw comprises a transverse locking screw shank and a transverse locking screw head, the transverse locking screw shank is provided with a transverse locking screw thread, the transverse locking screw thread engages with the internal thread of the locking hole on the inner core, and the top of the transverse locking screw head The end face is provided with a transverse locking screw driver hole. After the lateral locking screw passes through the elongated hole of the outer sleeve and is screwed into the locking hole, the head of the lateral locking screw is in the elongated hole of the outer sleeve, thereby realizing the fixed connection between the outer sleeve and the supporting platform.

The longitudinal locking screw comprises a longitudinal locking screw head and a longitudinal locking screw rod, the longitudinal locking screw rod is provided with a longitudinal locking screw thread, and the longitudinal locking screw thread is fixed to the internal thread of the platform fixing screw hole on the platform and the platform of the 3D printing part The internal threads of the holes are engaged with each other, the top end surface of the longitudinal locking screw is provided with a screwdriver hole for the longitudinal locking screw, and the threads of the longitudinal locking screw and the internal threads of the nut are engaged with each other. The nut and the longitudinal locking screw are used together to fix the 3D printed parts at both ends on the support platform respectively.

Beneficial effects of the present invention:

(1) The axial length can be adjusted, which can increase the flexibility of intraoperative use;

(2) When placing during the operation, adjust it to be slightly shorter than the required length, and then extend it to the required length after placement, which is convenient for placement;

(3) After placement during the operation, it can continue to extend slightly, pressurize both sides, and eliminate the contact gap;

(4) The 3D printed trabecular bone scaffold structure is used at both ends, which is conducive to fusion and has good long-term stability;

(5) Only need to print 3D printed parts at both ends, reducing 3D printing consumables and low cost;

(6) Modular assembly: The 3D printed parts can also be made in advance according to the characteristics of the bones of different types of people, which is conducive to flexible assembly and use in the operation. The extensible parts can also be designed and produced in advance. Can be modularized to save printing materials and shorten printing time;

(7) It is conducive to standardized production, and most patients can meet their needs through the combination of different models, saving the waiting time for temporary preoperative printing required by traditional technology, shortening hospitalization time, and reducing preoperative bed rest complications.

Description of drawings

Fig. 1 is the overall structural representation of the present invention;

Figure 2 is a perspective view of the outer sleeve;

Fig. 3 is the front view of outer sleeve;

Figure 4 is a perspective view of the supporting platform;

Fig. 5 is the front view of support platform;

Fig. 6 is a structural schematic diagram of an extendable member;

Fig. 7 is a schematic diagram of A-A direction of Fig. 6;

Fig. 8 is the first perspective view of the 3D printed part;

Fig. 9 is a second perspective view of the 3D printed part;

Fig. 10 is a perspective view of a 3D printed part;

Figure 11 is a front view of the 3D printed part;

Fig. 12 is a structural schematic diagram of a bone screw;

Figure 13 is a schematic structural view of a lateral locking screw;

Figure 14 is a schematic structural view of a longitudinal locking screw;

Fig. 15 is the structural representation of nut;

Fig. 16 is an exploded structure diagram of the present invention.

In the figure: 1-3D printing part, 2-extendable part, 3-outer sleeve, 4-sleeve outer wall, 5-sleeve inner wall, 6-strip hole, 7-platform, 8-inner core, 9 -Platform fixing screw holes, 10-Locking hole, 11-Reinforcing recess, 12-Supporting platform, 13-Lateral locking screw, 14-3D printing trabecular bone support structure, 15-Chassis, 16-Supporting reinforcement frame, 17- Bone fixation screw hole, 18-platform fixation hole, 19-reinforcing protrusion, 20-bone screw head, 21-bone screw shaft, 22-bone screw tail, 23-bone screw mechanical thread, 24-bone screw driver hole, 25 - Lateral locking screw shank, 26 - Lateral locking screw head, 27 - Lateral locking screw thread, 28 - Lateral locking screw driver hole, 29 - Longitudinal locking screw head, 30 - Longitudinal locking screw shank, 31 - Longitudinal locking screw thread, 32 - Longitudinal locking screw driver hole, 33-nut.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1 and Figure 16, the 3D printing artificial vertebral internal fixation device according to the present invention includes an extendable part 2 and a 3D printed part 1 located at both ends of the extendable part 2, as shown in Figure 6 and Figure 7, can be The extension part 2 includes an outer sleeve 3 and support platforms 12 respectively located at both ends of the outer sleeve 3 , and the 3D printed part 1 is located outside the support platform 12 and is fixedly connected to the support platform 12 .

As shown in Figures 2 and 3, the outer sleeve 3 is columnar, and the center of the outer sleeve 3 is provided with a cavity. In this embodiment, the cavity is cylindrical, so the wall of the outer sleeve 3 includes the outer wall of the sleeve 4 and sleeve inner wall 5. The outer wall 4 of the sleeve is polygonal. In this embodiment, the outer wall 4 of the sleeve is dodecagonal, and the inner wall 5 of the sleeve is provided with threads. A plurality of elongated holes 6 are evenly spaced on the wall of the outer sleeve 3 , and the elongated holes 6 are arranged symmetrically with respect to the axis of the outer sleeve 3 .

As shown in FIG. 4 and FIG. 5 , the support platform 12 includes a platform 7 and an inner core 8 , the platform 7 is fixedly connected to the 3D printed part 1 , and the shape of the platform 7 is the same as that of the 3D printed part 1 . The middle part of one side of the platform 7 is fixedly connected with the inner core 8, and the middle part of the other side of the platform 7 is provided with several reinforcing recesses 11, and the two ends of the platform 7 are symmetrically provided with platform fixing screw holes 9, and the platform fixing screw holes 9 are provided with internal threads. Its internal thread engages with the external thread of the longitudinal locking screw, and after the longitudinal locking screw passes through the 3D printing part 1 and the platform 7, the fixed connection between the supporting platform 12 and the 3D printing part 1 is realized

The inner core 8 is arranged in the outer sleeve 3, and the shape of the inner core 8 is the same as that of the inner wall of the outer sleeve. The outer surface of the inner core 8 is provided with threads, and the outer threads of the inner core 8 engage with the inner threads of the outer sleeve 3, and the outer threads of the two inner cores 8 at both ends of the outer sleeve 3 rotate in opposite directions. When the sleeve 3 rotates, the supporting platforms at both ends of the outer sleeve can move away from or approach at the same time, thereby adjusting the length of the artificial vertebral body. Several locking holes 10 are arranged on the inner core 8 along its axial direction. The locking holes 10 are provided with internal threads, and the internal threads of the locking holes 10 engage with the external threads of the lateral locking screws 13 . As shown in Figure 7, when the lateral locking screw 13 passes through the elongated hole 6 on the outer sleeve 3 and the locking hole 10 on the inner core 8, the fixed connection between the outer sleeve 3 and the inner core 8 is realized, preventing While the sleeve is rotated and locked, the length of the artificial vertebral body is fixed.

As shown in Figure 8, Figure 9, Figure 10 and Figure 11, the 3D printed part 1 includes a skeleton and a 3D printed bone trabecular support structure 14 filled in the skeleton, and the skeleton includes a supporting and strengthening skeleton 16, a chassis 15, and bone fixing screw holes 17 and the hole wall of the platform fixing hole 18, wherein the support reinforcement frame 16 includes an annular closed frame and a reinforcing rib arranged in parallel with the chassis 15, and the shape and size of the annular closed frame are the same as the outer contour and size of the chassis 15. Several reinforcing ribs are arranged at intervals between the annular closed frame and the chassis 15 , and the mechanical strength of the 3D printed part 1 is improved by arranging the chassis and the reinforcing ribs.

The hole walls of the platform fixing hole 18 are located at both ends of the chassis, one end of the platform fixing hole wall is fixedly connected with the chassis 15, and the other end is fixedly connected with the annular closed frame. The hole walls of several bone fixing screw holes 17 are arranged between the two platform fixing hole walls. In this embodiment, the hole walls of two bone fixing screw holes 17 are arranged. The side of the 3D printed part 1, and the other end is located on the top surface corresponding to the chassis, so one end of the wall of the bone fixing screw hole is fixedly connected with the rib on the side of the 3D printed part 1, and the other end of the wall of the bone fixing screw hole is connected to the platform The ends of the fixed hole walls are fixedly connected. The platform fixing hole wall is provided with an internal thread, and its internal thread is engaged with the external thread of the longitudinal locking screw, and the longitudinal locking screw passes through the platform fixing screw hole 9 on the platform 7 and the platform fixing hole 18 on the chassis 15, thereby The fixed connection between the support platform 12 and the 3D printing part 1 is realized. The wall of the bone fixation screw hole is provided with an internal thread, and the internal thread engages with the external thread of the bone screw. After one end of the bone screw is driven into the bone through the bone fixation screw hole 17, the fixed connection between the 3D printed part 1 and the bone is realized.

The bottom surface of the chassis 15 is provided with a plurality of reinforcing convex parts 19, and the reinforcing convex parts 19 are arranged corresponding to the reinforcing concave parts 11 on the platform 7. After the reinforcing convex parts 19 are arranged in the reinforcing concave parts 11, the gap between the chassis 15 and the platform 7 is strengthened. stable connection.

The 3D printed trabecular bone scaffold structure 14 is a topological microporous structure, and the micropores communicate with each other. The pore diameter of the microporous structure is 100 μm to 1200 μm, and the porosity is 40% to 88%. The 3D printed trabecular support structure 14 is 3D printed using titanium alloy, stainless steel, nickel, cobalt alloy, ceramics, polymer materials, tantalum (Ta), zirconium (Zr), niobium (Nb), polymer materials, or a mixture of the above materials. 3D printed trabecular bone scaffold structure 14 can carry anion, hydroxyapatite, antibacterial drugs, anti-tumor drugs, osteogenesis-promoting drugs and other drugs for local bone tissue targeted therapy. The printing method is not limited to selective laser sintering, selective laser melting, and electron beam melting technology, and can be continuously improved with the development of 3D printing technology.

Several large pores or channels may be left in the middle of the 3D printed trabecular bone scaffold structure 14 for implantation of allogeneic bone or autologous bone, which facilitates bone ingrowth and eventually forms a long-term fusion of bone and artificial vertebral body. In the present invention, a bone graft channel can be left in the middle of the 3D printed trabecular bone support structure 14, and the channel can extend toward the chassis and penetrate the chassis 15, that is, the chassis 15 is provided with a channel for the bone graft to pass through. At the same time, the inner core 8 of the support platform 12 also has channels communicating with the 3D printed bone graft channels at both ends, which is beneficial to the integrated healing of the bone graft material.

As shown in Figure 12, the bone screw comprises a bone screw head 20, a bone screw shaft 21 and a bone screw tail 22, the head of the bone screw shaft 21 is fixedly connected to the bone screw head 20, and the bottom of the bone screw shaft 21 is connected to the bone screw tail 22. Fixed connection, bone screw mechanical thread 23 is provided at the joint between bone screw head 20 and bone screw shaft 21, bone screw screwdriver hole 24 is provided on the top end surface of bone screw head 20, bone screw mechanical thread 23 and 3D printed parts 1 at both ends The internal thread of the bone fixation screw hole 17 is engaged, thereby realizing the fixed connection between the bone screw and the 3D printed part 1 . The bone screw rod 21 is provided with an external thread, which realizes the fixed connection between the bone screw rod 21 and the bone. Therefore, the bone screw realizes the fixed connection between the 3D printed part 1 and the bone.

As shown in Figure 13, the lateral locking screw 13 comprises a lateral locking screw shank 25 and a lateral locking screw head 26, the lateral locking screw shank 25 is provided with a thread 27, and the lateral locking screw thread 27 and the internal thread of the locking hole 10 on the inner core 8 To engage, the top end surface of the transverse locking screw head 26 is provided with a transverse locking screw driver hole 28 . After the horizontal locking screw 13 passes through the elongated hole 6 of the outer sleeve and is screwed into the locking hole 10, the head of the lateral locking screw 26 is in the elongated hole 6 of the outer sleeve, thereby realizing the connection between the outer sleeve 3 and the supporting platform. The position of 12 is fixed, and the rotation of outer sleeve 3 is limited.

As shown in Figure 14, the longitudinal locking screw comprises a longitudinal locking screw head 29 and a longitudinal locking screw shank 30, the longitudinal locking screw shank 30 is provided with a longitudinal locking screw thread 31, and the longitudinal locking screw thread 31 is connected to the platform fixing screw hole on the platform 7 The internal thread of the 3D printing part 1 is engaged with the internal thread of the platform fixing hole, and the top end surface of the longitudinal locking screw 30 is provided with a longitudinal locking screw screwdriver hole 32 . The longitudinal locking screw is used in conjunction with the nut 33 in Figure 15. The inner thread of the nut 33 is engaged with the thread 31 of the longitudinal locking screw. The nut 33 is used in conjunction with the longitudinal locking screw, so that the 3D printed parts 1 at both ends are respectively fixed on the support on platform 12.

The method of use of the present invention is as follows: Firstly, the 3D printed parts 1 on both sides are respectively fixedly connected to the two supporting platforms 12 by longitudinally locking the screws and nuts, and then the device is placed between the upper and lower vertebral bodies. Rotate the outer sleeve, and the support platforms on both sides of the outer sleeve can be moved away from or close to at the same time to adjust the length of the artificial vertebral body. When the support platforms 12 on both sides are in close contact with the upper and lower vertebral bodies respectively, and the two sides After the vertebral body of the vertebral body is simultaneously resisted, it is screwed into the bone screw for fixation, and the lateral locking screw 13 is screwed into the locking hole 10 of the inner core 8 of the supporting platform on both sides through the elongated hole 6 of the outer sleeve 3, and the screw of the lateral locking screw 13 The head is in the groove of the outer sleeve 3, which can prevent the outer sleeve from rotating and locking.

The two ends of the artificial vertebral internal fixation device are in contact with the bone as a 3D printed part 1, which is provided with a bone trabecular microporous structure that facilitates bone ingrowth. According to the patient's CT data, the modeling is completed through medical reverse engineering software such as mimics, and the contact surface and the shape of the printed parts are designed to match the human body by using computer digital orthopedic technology to match the human body. At the same time, according to the bone characteristics of the crowd, Make different types of prints in advance, which is conducive to flexible combination and use during surgery.

The extendable part in the middle of the fixation device in the artificial vertebral body is a non-3D printed part, which can drive the movement of the manufacturing platform of the positive and negative thread structure through the rotation of the outer sleeve to realize the extension of the vertebral body, and has an extended locking structure. The 3D printing part and the non-3D printing part have different models, and different models can be modularly assembled, which is beneficial to save printing materials, shorten printing time, increase intraoperative flexibility, reduce the gap between artificial vertebral body and bone interface, and promote Integration is conducive to long-term stability.

Claims (8)

1. a kind of 3D printing artificial vertebral body inner fixing device, it is characterised in that：Including can extension device (2) and positioned at can extension device (2) the 3D printing part (1) at both ends, it is described can extension device (2) include outer sleeve (3) and the branch for being located at outer sleeve (3) both ends Platform (12) is supportted, 3D printing part (1) is located at the outside of support platform (12), and is fixedly connected with support platform (12)；

The barrel of the outer sleeve (3) includes sleeve outer wall (4) and sleeve lining (5), and sleeve outer wall (4) is in polygon, sleeve Inner wall (5) is equipped with screw thread, and several elongate holes (6) are arranged in uniform intervals on the barrel of outer sleeve (3), and elongate holes (6) are opposite It is arranged in the axisymmetrical of outer sleeve (3)；

The support platform (12) includes platform (7) and inner core (8), and platform (7) is fixedly connected with 3D printing part (1), platform (7) A middle side part be fixedly connected with inner core (8), the both ends of platform (7) are symmetrical arranged platform fixing threaded hole (9), platform fixing threaded hole (9) it is equipped with internal thread, the external screw thread of internal thread and longitudinally locked screw is intermeshed；

In outer sleeve (3), the outer surface of inner core (8) is equipped with screw thread for the inner core (8) setting, the external screw thread of inner core (8) with it is outer Be intermeshed between the internal thread of sleeve (3), be located at outer sleeve (3) both ends two inner cores (8) external screw thread direction of rotation on the contrary, Several lock holes (10) are arranged in its axis direction of inner core (8) upper edge, and lock hole (10) is set relative to the axisymmetrical of inner core (8) It sets, lock hole (10) is equipped with internal thread, the external screw thread engagement of the internal thread and lateral locking screw (13) of lock hole (10)；

The 3D printing part (1) includes skeleton and is filled in intraskeletal 3D printing bone trabecula supporting structure (14), and skeleton includes Support reinforcing skeleton (16), chassis (15), the hole wall of skeletal fixation screw hole (17) and platform mounting hole (18) hole wall, platform is solid Determine hole hole wall and be equipped with internal thread, the external screw thread of internal thread and longitudinal pinning screw is intermeshed, and longitudinal pinning screw realizes branch Support platform (12) is fixedly connected with 3D printing part (1), and skeletal fixation screw hole hole wall is equipped with internal thread, internal thread and bone screws External screw thread intermeshing, bone screws realize that 3D printing part (1) is fixedly connected with bone.

2. 3D printing artificial vertebral body inner fixing device according to claim 1, it is characterised in that：The support reinforcing skeleton (16) include ring seal skeleton and reinforcing rib, ring seal skeleton is arranged in parallel with chassis (15), ring seal skeleton and bottom It is connected by several spaced reinforcing ribs between disk (15), the hole wall of the platform mounting hole (18) is located at chassis (15) The one end at both ends, platform mounting hole hole wall is fixedly connected with chassis (15), and the other end is fixedly connected with ring seal skeleton, two The hole wall of several skeletal fixation screw holes (17) is equipped between platform mounting hole hole wall, skeletal fixation screw hole hole wall is inclined to set, One end is located at the side of 3D printing part (1), and the other end is located at top surface corresponding with chassis, and the one of skeletal fixation screw hole hole wall End is fixedly connected with the reinforcing rib of 3D printing part (1) side, the other end and the platform mounting hole hole wall of skeletal fixation screw hole hole wall End be fixedly connected.

3. 3D printing artificial vertebral body inner fixing device according to claim 1, it is characterised in that：The platform (7) and bottom The side of disk (15) contact is equipped with several reinforcement recess portions (11), and it is convex that the corresponding bottom surface in chassis (15) is equipped with several reinforcements Portion (19) reinforces protrusion (19) and is correspondingly arranged with the reinforcement recess portion (11) on platform (7), and it is recessed in reinforcement to reinforce protrusion (19) setting In portion (11).

4. 3D printing artificial vertebral body inner fixing device according to claim 1, it is characterised in that：The 3D printing bone trabecula Supporting structure (14) is topological microcellular structure, and the aperture of the mutual traffic in micropore, the microcellular structure hole is 100-1200 μm, empty Gap rate is 40%-88%.

5. 3D printing artificial vertebral body inner fixing device according to claim 1, it is characterised in that：The 3D printing bone trabecula The middle part of supporting structure (14) can there are being implanted into hole or the channel of homogeneous allogenic bone or autologous bone, may pass through it is corresponding Chassis (15), inner core (8), and by outer sleeve (3), form perforative bone grafting channel up and down.

6. 3D printing artificial vertebral body inner fixing device according to claim 1, it is characterised in that：The bone screws include bone Head of screw (20), murices nail rod (21) and bone screws tail (22), head and the fixed company of murices ailhead (20) of murices nail rod (21) It connects, the bottom of murices nail rod (21) is fixedly connected with bone screws tail (22), the connection of murices ailhead (20) and murices nail rod (21) Place is equipped with bone screws mechanical whorl (23), and the top end surface of murices ailhead (20) is equipped with bone screws screwdriver hole (24), murices nailing machine Tool screw thread (23) and the internal thread of the skeletal fixation screw hole (17) of the 3D printing part (1) at both ends are intermeshed, murices nail rod (21) Equipped with external screw thread.

7. 3D printing artificial vertebral body inner fixing device according to claim 1, it is characterised in that：The lateral locking screw (13) include lateral locking shank of screw (25) and lateral locking head of screw (26), lateral locking shank of screw (25), which is equipped with, laterally to be locked Determine screw thread (27), lateral locking screw thread (27) and the internal thread of lock hole (10) on inner core (8) are intermeshed, laterally The top end surface of lock screw head (26) is equipped with lateral locking screwdriver hole (28).

8. 3D printing artificial vertebral body inner fixing device according to claim 1, it is characterised in that：The longitudinally locked screw Including longitudinally locked head of screw (29) and longitudinally locked shank of screw (30), longitudinally locked shank of screw (30) is equipped with longitudinally locked spiral shell Oncomelania line (31), the internal thread and 3D printing part (1) of longitudinally locked screw thread (31) and the platform fixing threaded hole on platform (7) Platform mounting hole internal thread intermeshing, the top end surface of longitudinally locked screw (30) is equipped with longitudinally locked screwdriver hole (32), longitudinally locked screw thread (31) and the internal thread of nut (33) are intermeshed.