CN215606601U - 3D prints interbody fusion cage - Google Patents
3D prints interbody fusion cage Download PDFInfo
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- CN215606601U CN215606601U CN202121473864.7U CN202121473864U CN215606601U CN 215606601 U CN215606601 U CN 215606601U CN 202121473864 U CN202121473864 U CN 202121473864U CN 215606601 U CN215606601 U CN 215606601U
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Abstract
The utility model discloses a 3D printing interbody fusion cage, and relates to the technical field of medical instruments. The 3D printing interbody fusion cage adopts a square or trapezoidal structure with four corners of arc chamfers on the cross section of a matrix, each surface of the interbody fusion cage presents an arc-shaped curved surface, and the upper surface and the lower surface are matched with the radians of the end plates of the upper vertebral body and the lower vertebral body; the interbody fusion cage comprises a supporting structure for supporting, a porous structure for bone ingrowth and a bone grafting bin penetrating through the upper surface and the lower surface; a plurality of instrument grooves are distributed on the front surface of the intervertebral fusion device; the upper surface and the lower surface are provided with anti-skid bulges, and the porous structure is lower than the anti-skid bulges; the porous structure is composed of a plurality of porous structure units and through holes with different sizes between adjacent porous structure units, and the porous structure units are in regular lattice structures or random lattice structures. The embodiment can avoid vertebral body sedimentation and stress shielding, and can realize accurate matching with individual mechanical requirements.
Description
Technical Field
The utility model relates to the technical field of medical instruments, in particular to a 3D printing interbody fusion cage.
Background
The lumbar interbody fusion cage is an orthopedic implant for treating lumbar intervertebral disc-derived lumbago, lumbar spondylolisthesis of various reasons, vertebral canal decompression, restoration, fixation and other diseases.
The traditional lumbar interbody fusion cage is generally made of titanium alloy or PEEK material, a bone grafting bin is reserved in the middle, and autogenous bones or artificial bones are placed in the bone grafting bin in the operation. The main body of the titanium alloy or PEEK material fusion cage plays a role in temporary support and fixation after operation, and the bone grafting in the bone grafting bin is slowly fused with the upper vertebral body and the lower vertebral body under the stimulation of various stresses of the end plates of the upper vertebral body and the lower vertebral body, so that the aims of recovering the physiological bending of the lumbar vertebra and accelerating the fusion of the upper vertebral body and the lower vertebral body are finally fulfilled.
Although the traditional intervertebral fusion cage is widely applied to clinical operation, the following problems still exist:
1. the problem of vertebral body sedimentation is solved, the traditional intervertebral fusion cage is easy to cause overlarge pressure between the fusion cage and a vertebral body end plate due to the limited contact area of the fusion cage and the vertebral body end plate, and the fusion cage sinks into the vertebral body end plate so as to subside the vertebral body;
2. stress shielding problem, and stress stimulation is a necessary condition for bone grafting fusion. The elastic modulus of the traditional titanium alloy interbody fusion cage is larger than that of vertebral body bone, so that the titanium alloy interbody fusion cage bears most of stress, the stress stimulation of bone grafting is less, a stress shielding effect is generated, and the fusion speed is slower. The elastic modulus of the PEEK material is closer to that of vertebral body bone, so that the PEEK fusion cage can better avoid stress shielding, but the PEEK material has hydrophobic property, forms fibrous tissues on the surface and has poor fusion effect;
3. the problem of accurate matching is that the difference between individuals is large, and the standard lumbar anterior intervertebral fusion device is difficult to match with each person, so that the problems of sedimentation, fatigue failure and the like can occur after some lumbar anterior intervertebral fusion devices are implanted into the body. The size, shape and other structures of the fusion device can influence the stability of implantation and the fusion effect in the clinical lumbar anterior intervertebral fusion;
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a 3D printing interbody fusion cage which can avoid vertebral body subsidence and stress shielding and can realize accurate matching with individuals.
In order to achieve the purpose, the utility model provides the following technical scheme:
A3D printing interbody fusion cage is characterized in that the interbody fusion cage adopts a square or trapezoidal structure with four arc chamfers on the cross section of a base body, each surface of the interbody fusion cage presents a circular arc-shaped curved surface, and the upper surface and the lower surface of the interbody fusion cage are matched with the radians of upper and lower vertebral body end plates; the interbody fusion cage comprises a supporting structure for supporting, a porous structure for bone ingrowth and bone grafting bins penetrating through the upper surface and the lower surface; a plurality of instrument grooves are distributed on the front surface of the intervertebral fusion device; the upper surface and the lower surface are provided with anti-skid protrusions, and the porous structure is lower than the anti-skid protrusions; the porous structure is composed of a plurality of porous structure units and through holes with different sizes between adjacent porous structure units, and the porous structure units are in regular lattice structures or random lattice structures.
Optionally, the through holes include 2 to 4 through holes with different sizes and circular or polygonal shapes.
Optionally, there are 3 instrument slots and multiple surgical approaches are supported.
Optionally, the anti-slip protrusions are tooth-shaped protrusions.
Optionally, the support structure comprises: vertical supports for the front and back sides and lateral supports for the upper and lower surfaces.
Optionally, there are 3 vertical supports on the back side, and 2 vertical supports on the front side or all-solid supports.
Optionally, the porosity of the porous structure is 60-90%, the pore size is 250-1000 μm, and the rod size is 200-1000 μm.
Optionally, the interbody cage is manufactured by one or more additive manufacturing methods selected from Ti6Al4V, TC4, TA4, PEEK, magnesium and tantalum through selective laser melting, electron beam melting and fused deposition manufacturing.
According to the technical scheme of the utility model, a plurality of instrument grooves are distributed on the front surface of the interbody fusion cage, so that a plurality of operation access modes can be supported, the practicability of the interbody fusion cage is stronger, and the interbody fusion cage is convenient to be accurately matched with individuals; the upper surface and the lower surface of the interbody fusion cage are provided with the anti-skid projections, so that friction can be increased, the pressure of a vertebral body end plate is reduced, and the risks of prolapse and subsidence are avoided; because the dentate bulge is embedded into the upper vertebral body end plate and the lower vertebral body end plate, the porous structure of the dentate bulge in the region is contacted with the surface of the vertebral body end plate, the stability effect of the intervertebral fusion device in the initial stage after implantation is good, and the centrum sedimentation is not easy to occur; the porous structure comprises a plurality of through holes with different sizes, and the structure combining the large holes and the small holes is favorable for nutrition delivery, has good bone growth effect and is favorable for fusion; through porous structure's design for interbody fusion cage's elastic modulus is low, and the osteoinduction can be amazing to tissue deformation in all around and the bone grafting storehouse, has avoided stress to shelter from, and porous structure unit arranges rationally, has avoided because the inhomogeneous problem of stress distribution that the partial disappearance of porous structure unit leads to.
Further effects of the above-mentioned non-conventional alternatives will be described below in connection with the embodiments.
Drawings
The drawings are included to provide a better understanding of the utility model and are not to be construed as unduly limiting the utility model. Wherein:
FIG. 1 is a perspective view of a 3D printed interbody cage according to one embodiment of the present disclosure;
FIG. 2 is an elevation view of a 3D printed intervertebral cage according to one embodiment of the utility model;
FIG. 3 is a schematic structural view of a porous structural unit according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a porous structural unit according to another embodiment of the present invention;
FIG. 5 is a side view of a 3D printed intervertebral cage according to one embodiment of the utility model;
FIG. 6 is a top view of a 3D printed intervertebral cage according to one embodiment of the utility model;
FIG. 7 is a rear view of a 3D printed intervertebral cage according to an embodiment of the utility model;
FIG. 8 is a perspective view of a 3D printed intervertebral cage according to another embodiment of the utility model;
FIG. 9 is an elevation view of a 3D printed intervertebral cage according to another embodiment of the utility model;
figure 10 is a side view of a 3D printed intervertebral cage according to another embodiment of the utility model.
Detailed Description
Exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which various details of embodiments of the utility model are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the utility model. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Fig. 1 is a perspective view of a 3D printed intervertebral cage according to an embodiment of the present invention. As shown in figure 1, in one embodiment of the present invention, the interbody fusion cage adopts a square or trapezoid structure with four arc-shaped chamfers on the cross section of the base body, and each surface of the interbody fusion cage presents a circular arc-shaped curved surface, and the upper and lower surfaces are matched with the radian of the end plates of the upper and lower vertebral bodies. As shown in figure 1, the intervertebral cage comprises a support structure 11 for support, a porous structure 12 for bone ingrowth and a bone graft compartment 14 through the upper and lower surfaces 13. A plurality of instrument slots 15 are distributed in the front of the intervertebral cage and can support a plurality of surgical approaches, such as: can meet the access requirements of ALIF (anterior lumbar interbody fusion) and OLIF (oblique lateral lumbar interbody fusion), so that the interbody fusion cage has stronger practicability and is convenient for accurate matching with individuals.
Fig. 2 is a front view of a 3D printed intervertebral cage according to one embodiment of the utility model. In an embodiment of the utility model, as shown in fig. 2, the intervertebral cage has, for example, 3 instrument wells distributed in the front and supports multiple surgical approaches.
In one embodiment of the utility model, as shown in figures 1 and 2, the upper and lower surfaces 13 of the intersomatic cage are provided with cleats 16 and the porous structure 12 is lower than the cleats 16, wherein the cleats 16 are, for example, toothed cleats. In the using process of the interbody fusion cage, the upper surface and the lower surface of the interbody fusion cage are matched with the radians of the upper vertebral body end plate and the lower vertebral body end plate, the contact area is large, the upper surface and the lower surface are fully attached to the vertebral body end plates, the toothed protrusions are embedded into the upper vertebral body end plate and the lower vertebral body end plate, friction is increased, the pressure of the vertebral body end plates is reduced, and the risk of dislocation and subsidence is avoided. Meanwhile, the dentate bulges are embedded into the upper vertebral body end plate and the lower vertebral body end plate, so that the porous structure is contacted with the surfaces of the vertebral body end plates, the stability effect of the intervertebral fusion device after implantation at the initial stage is good, and the vertebral body sedimentation is not easy to occur.
Referring to fig. 1, in one embodiment of the present invention, the porous structure 12 is composed of a plurality of porous structure units 17 and a plurality of through holes of different sizes between adjacent porous structure units. The structure combining the big hole and the small hole is beneficial to nutrient delivery, has good bone growth effect and is beneficial to fusion; through the design of porous structure for the elastic modulus of interbody fusion cage is low, and the tissue deformation can stimulate osteoinduction around and in the bone grafting storehouse, has avoided stress to shelter from. In specific implementation, the through holes between adjacent porous structure units can be composed of 2 to 4 holes with different sizes, and the shapes of the holes can be various structures such as circles or polygons.
Fig. 3 is a schematic structural view of a porous structural unit according to an embodiment of the present invention. In one embodiment of the utility model, as shown in fig. 3, the porous structural elements are, for example, regular lattice structures, only one of which is shown.
Fig. 4 is a schematic structural view of a porous structural unit according to another embodiment of the present invention. In another embodiment of the utility model, as shown in fig. 4, the porous structural elements are, for example, random lattice structures, only one of which is shown.
It should be understood by those skilled in the art that the regular lattice structure or the random lattice structure shown in the embodiments of the present invention is only one specific embodiment, and in implementing the present invention, the structure of the porous structural unit can be flexibly set according to needs, which does not affect the implementation effect of the present invention.
FIG. 5 is a side view of a 3D printed intervertebral cage according to one embodiment of the utility model; FIG. 6 is a top view of a 3D printed intervertebral cage according to one embodiment of the utility model; figure 7 is a rear view of a 3D printed intervertebral cage according to one embodiment of the utility model. In the embodiment of the present invention, the intervertebral cage is vertically and horizontally symmetrical, so that the side view shown in fig. 5 can be taken as a left side view and a right side view, and the top view shown in fig. 6 can be taken as a bottom view.
As can be seen in the figures, in one embodiment of the utility model, the support structure 11 includes front and rear vertical supports 111 and upper and lower surface lateral supports 112. Wherein, in one embodiment of the utility model, there are 3 vertical supports on the back, 2 vertical supports on the front, and 1 horizontal support on the upper and lower surfaces, providing sufficient rigidity to the interbody cage. When the device is specifically implemented, the width of the vertical support on the back can be adjusted according to the rigidity requirement, and similarly, the size of the solid part of the front except the vertical support can also be adjusted according to the rigidity requirement, so that the device can be accurately matched with an individual.
FIG. 8 is a perspective view of a 3D printed intervertebral cage according to another embodiment of the utility model; FIG. 9 is an elevation view of a 3D printed intervertebral cage according to another embodiment of the utility model;
figure 10 is a side view of a 3D printed intervertebral cage according to another embodiment of the utility model. Figures 8 to 10 show an intervertebral cage according to another embodiment of the utility model, which differs from the previous embodiments only in that the frontal vertical support of the intervertebral cage is a full solid support, so designed to support the higher stiffness requirements.
In addition, according to the structure of the intervertebral fusion cage of the utility model, when the structure is implemented, the porosity of the porous structure is 60-90%, and the aperture size is 250-. Wherein, the aperture is the diameter of the hole, and the rod diameter is the shortest distance between the outer edges of two adjacent holes.
In the specific implementation process, the interbody fusion cage can be made of one of a plurality of materials such as Ti6Al4V, TC4, TA4, PEEK, Ta (tantalum), Mg (magnesium) and the like by one or more additive manufacturing modes of selective laser melting SLM (SLM), electron beam melting EBM (electron beam melting), fused deposition manufacturing FDM and the like. When the interbody fusion cage is printed, firstly, a 3D printing interbody fusion cage model suitable for a patient is designed; then, slicing the model to obtain a slice file, and importing the slice file into a 3D printer with set parameters; and then generating plane geometric information of the sliced file according to the sliced file, printing according to the plane geometric information, and descending the substrate by one layer after printing is finished each time until the whole interbody fusion cage is printed. In specific implementation, after design optimization, a 3D printing porous lumbar anterior intervertebral fusion device model suitable for a patient is designed, preprocessing such as optimization and slicing is performed before printing, a slice file is led into a 3D printer with set parameters, a printing system generates sliced plane geometric information in a computer according to the lumbar anterior intervertebral fusion device, and after printing is completed for one layer, a substrate is lowered for one layer until the whole fusion device is sintered.
When the interbody fusion cage is used, a doctor firstly takes a standard lying position for a patient, then utilizes the Kirschner wire perspective imaging to determine the position of a responsibility segment, confirms the position of an incision, takes the position of the front edge of the psoas major as an ideal initial position of a probe in an intervertebral space, then places a retractor, enables an opening of the retractor to be parallel to the intervertebral space, removes end plates and intervertebral disc cartilages, and finally implants the interbody fusion cage.
According to the technical scheme of the embodiment of the utility model, a plurality of instrument grooves are distributed on the front surface of the interbody fusion cage, so that a plurality of operation access modes can be supported, the practicability of the interbody fusion cage is stronger, and the interbody fusion cage is convenient to be accurately matched with individuals; the upper surface and the lower surface of the interbody fusion cage are provided with the anti-skid projections, so that friction can be increased, the pressure of a vertebral body end plate is reduced, and the risks of prolapse and subsidence are avoided; because the dentate bulge is embedded into the upper vertebral body end plate and the lower vertebral body end plate, the porous structure of the dentate bulge in the region is contacted with the surface of the vertebral body end plate, the stability effect of the intervertebral fusion device in the initial stage after implantation is good, and the centrum sedimentation is not easy to occur; the porous structure comprises a plurality of through holes with different sizes, and the structure combining the large holes and the small holes is favorable for nutrition delivery, has good bone growth effect and is favorable for fusion; through porous structure's design for interbody fusion cage's elastic modulus is low, and the osteoinduction can be amazing to tissue deformation in all around and the bone grafting storehouse, has avoided stress to shelter from, and porous structure unit arranges rationally, has avoided because the inhomogeneous problem of stress distribution that the partial disappearance of porous structure unit leads to.
The above-described embodiments should not be construed as limiting the scope of the utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions can occur, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The 3D printing interbody fusion cage is characterized in that the interbody fusion cage adopts a square or trapezoidal structure with four arc chamfers at four corners of a base body cross section, each surface of the interbody fusion cage presents an arc-shaped curved surface, and the upper surface and the lower surface are matched with the radians of upper and lower vertebral body end plates;
the interbody fusion cage comprises a supporting structure for supporting, a porous structure for bone ingrowth and bone grafting bins penetrating through the upper surface and the lower surface;
a plurality of instrument grooves are distributed on the front surface of the intervertebral fusion device;
the upper surface and the lower surface are provided with anti-skid protrusions, and the porous structure is lower than the anti-skid protrusions;
the porous structure is composed of a plurality of porous structure units and through holes with different sizes between adjacent porous structure units, and the porous structure units are in regular lattice structures or random lattice structures.
2. The 3D printed intersomatic cage of claim 1, wherein the through-holes comprise 2 to 4 through-holes of different sizes, circular or polygonal in shape.
3. The 3D printed intervertebral cage of claim 1, wherein there are 3 instrument slots and multiple surgical approaches are supported.
4. The 3D printing interbody cage of claim 1, wherein the anti-slip projections are dentate projections.
5. The 3D printing interbody cage of claim 1, wherein the support structure comprises: vertical supports for the front and back sides and lateral supports for the upper and lower surfaces.
6. The 3D printed intersomatic cage of claim 5, wherein the back face has 3 vertical supports and the front face has 2 vertical supports or is a full solid support.
7. The 3D printing interbody fusion cage of claim 1, wherein the porosity of the porous structure is 60-90%, and the pore size is 250-1000 μm, and the rod size is 200-1000 μm.
8. The 3D printed intersomatic cage of claim 1, wherein the intersomatic cage is manufactured using one of Ti6Al4V, TC4, TA4, PEEK, magnesium, tantalum, by one or more additive manufacturing methods selected from selective laser melting, electron beam melting, fused deposition manufacturing.
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| CN202121473864.7U CN215606601U (en) | 2021-06-30 | 2021-06-30 | 3D prints interbody fusion cage |
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| CN202121473864.7U CN215606601U (en) | 2021-06-30 | 2021-06-30 | 3D prints interbody fusion cage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115192272A (en) * | 2022-07-21 | 2022-10-18 | 西安科技大学 | Irregular porous interbody fusion cage and processing method thereof |
| WO2023035580A1 (en) * | 2021-09-13 | 2023-03-16 | 智塑健康科技(嘉兴)有限公司 | Fusion cage |
| WO2023035581A1 (en) * | 2021-09-13 | 2023-03-16 | 智塑健康科技(嘉兴)有限公司 | Fusion cage |
-
2021
- 2021-06-30 CN CN202121473864.7U patent/CN215606601U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023035580A1 (en) * | 2021-09-13 | 2023-03-16 | 智塑健康科技(嘉兴)有限公司 | Fusion cage |
| WO2023035581A1 (en) * | 2021-09-13 | 2023-03-16 | 智塑健康科技(嘉兴)有限公司 | Fusion cage |
| CN115192272A (en) * | 2022-07-21 | 2022-10-18 | 西安科技大学 | Irregular porous interbody fusion cage and processing method thereof |
| CN115192272B (en) * | 2022-07-21 | 2024-09-27 | 西安科技大学 | Irregular porous interbody fusion cage and processing method thereof |
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