CN210250171U

CN210250171U - Anterior cervical interbody fusion cage

Info

Publication number: CN210250171U
Application number: CN201920808821.6U
Authority: CN
Inventors: 张建鹏; 王宁; 李佳宾; 宗贵升
Original assignee: Beijing Three Empires Kang Technology Co ltd
Current assignee: BEIJING WORLDWIDE JINGBO PROSTHETIC REHABILITATION EQUIPMENT Co.,Ltd.
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-04-07
Anticipated expiration: 2029-05-30

Abstract

The embodiment of the utility model discloses an anterior cervical interbody fusion cage, which comprises a basal body for supporting and a porous bone trabecular structure for bone ingrowth, wherein the porous bone trabecular structure is connected inside the basal body; the substrate is of a square structure, and four corners of the square are arc chamfers; the interior of the matrix is of a cavity structure; the front end face of the base body is provided with an operation tool interface, the other three end faces of the base body and four arc-shaped chamfer measuring faces of the base body are respectively provided with two square through holes, and the two square through holes are arranged in parallel; the top surface of the base body is provided with five hexagonal through holes penetrating to the bottom; a polygonal through hole penetrating to the bottom is formed in the position, far away from the surgical tool interface, of the top of the base body; adopt the base member to be square structure and square four corners and can match with anterior cervical intervertebral for arc chamfer structure, be fit for human anterior cervical intervertebral treatment, improve treatment.

Description

Anterior cervical interbody fusion cage

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to anterior cervical interbody fusion cage.

Background

The anterior cervical interbody fusion cage is an orthopedic implant for treating spinal cervical spondylosis, cervical spondylotic radiculopathy, cervical intervertebral disc protrusion, spinal stenosis and other diseases. The doctor firstly transversely cuts the front edge of the cervical vertebra body on the front right side of the neck, fully exposes the front edge of the cervical vertebra body, positions the intervertebral space of the damaged cervical vertebra body under perspective, cleans the damaged part of the cervical vertebra body, cuts off the intervertebral disc of the damaged part of the cervical vertebra body, inserts a spreader into the intervertebral space, grinds the bone surface matched with the fusion device on the end plate, cuts off the corresponding intervertebral disc, if necessary, removes the posterior longitudinal ligament, cleans the bone grafting bed by a curette, and implants the fusion device matched with the specification after complete decompression.

The traditional anterior cervical interbody fusion cage is generally made of titanium alloy or PEEK, 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 fusion cage plays a role in temporary support and fixation after operation, and the bone graft in the bone graft bin is slowly fused with the upper and lower end plates under the stimulation of various stresses of the upper and lower vertebral bodies, so that the aims of recovering the physiological bending of the cervical vertebra and accelerating the fusion of the upper and lower vertebral bodies are finally achieved. Although the traditional fusion cage is widely applied to clinical operation, the following problems still exist: the problem of bone grafting is that bone grafting is generally divided into autogenous bone and artificial bone. The autogenous bone generally refers to a small amount of bone removed from the diseased part of the cervical vertebra in the operation process or autogenous iliac cancellous bone cut through a small incision, and the bone for planting the bone is excellent, the fusion efficiency is higher, and no rejection reaction exists. The defect is that the bone quantity of the pathological change part of the cervical vertebra is less, and the requirement of bone grafting can not be met; if the ilium is taken, an additional operation is required to cause an ilium injury. The artificial bone refers to a bone substance artificially synthesized before surgery, and although the damage from the ilium can be reduced by using the artificial bone, the fusion rate is low, and rejection reaction may be generated. The problem of centrum subsidence, traditional interbody fusion cage for the area of contact of fusion cage and centrum end plate is limited because of the existence of bone grafting storehouse, causes pressure between the two too big easily, and the fusion cage is sunk into the end plate, and then the centrum subsides. Stress shielding problem, and stress stimulation is a necessary condition for bone grafting fusion. The elastic modulus of the titanium alloy is larger than that of vertebral bone, so that the titanium alloy 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 relatively close to that of vertebral body bone, so that the PEEK fusion cage can better avoid stress shielding, the vertebral body fusion speed is relatively high, but the strength is insufficient, and other complications are easy to generate. The problem of accurate matching is that the standard anterior cervical interbody fusion cage is difficult to be optimized for the individual difference of patients, so that the problems of sedimentation, fatigue failure and the like easily occur after some anterior cervical interbody fusion cages are implanted into the body. In clinical cervical interbody fusion, the size, shape and other structures of the fusion cage affect the stability and fusion effect of implantation, and are more concerned with the recovery effect of postoperative patients.

SUMMERY OF THE UTILITY MODEL

Therefore, the embodiment of the utility model provides an anterior cervical interbody fusion cage to solve among the prior art anterior cervical interbody fusion cage and plant more, the centrum subsides and the slow problem of fusion speed.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions: an anterior cervical interbody cage comprising a base for support and a porous bone trabecular structure for bone ingrowth connected to the interior of the base; the substrate is of a square structure, and four corners of the square are arc chamfers; the interior of the matrix is of a cavity structure; the front end face of the base body is provided with an operation tool interface, the other three end faces of the base body and four arc-shaped chamfer measuring faces of the base body are respectively provided with two square through holes, and the two square through holes are arranged in parallel; the top surface of the base body is provided with five hexagonal through holes penetrating to the bottom; and a polygonal through hole penetrating to the bottom is formed in the position, far away from the surgical tool interface, of the top of the base body.

Furthermore, one of the five hexagonal through holes is positioned at the center of the base body, and the other four hexagonal through holes are uniformly distributed at four arc-shaped chamfers close to the base body.

Furthermore, the sectional area of the polygonal through hole is half of that of the hexagonal through hole.

Furthermore, the surgical tool interface is a threaded interface, the left side and the right side of the surgical tool interface are respectively provided with a square cavity channel penetrating into the base body, and one end of the square cavity channel, which is far away from the surgical tool interface, is provided with an arc cavity channel penetrating into the base body.

Furthermore, the base body is provided with a plurality of vertical beams and a plurality of cross beams.

Further, the vertical beams are vertically connected to corners of the hexagonal through holes.

Furthermore, two ends of the cross beam are fixedly connected with the vertical beams at two ends of each side of the hexagonal through hole.

Further, the cross beam is located at the middle point of the vertical beam.

Further, the porous bone trabecular structure is formed by crosslinking a plurality of dodecahedral structures.

Furthermore, the porosity of the porous bone trabecula structure is 60-90%, the pore size is 500-.

The embodiment of the utility model provides a have following advantage: the matrix is in a square structure, and the four square corners are arc-shaped chamfer structures, so that the matrix can be matched with the anterior cervical intervertebral, and is suitable for the treatment of the anterior cervical intervertebral of a human body, and the treatment effect is improved; the support structure bears most of the compressive, shear, lateral and torsional forces transmitted by the upper and lower vertebral bodies in the anterior cervical spine. The porous bone trabecula structure has bone induction effect, induces the bone of the upper and lower end plates to grow in, and finally fuses the upper and lower vertebral bodies; the upper surface and the lower surface are fully attached to the end plate, and no bone grafting bin is arranged, so that the contact surface area of the bone grafting device and the end plate is large, and the centrum sedimentation is not easy to occur. The equivalent elastic modulus of the whole structural unit is similar to that of human bones (the elastic modulus of cancellous bones is 0.5-3 GPa, and the elastic modulus of cortical bones is 12-18 GPa), so that the stress shielding effect can be avoided, and the fusion rate is accelerated; the supporting structure consists of cross beams and vertical beams. The internal beam is designed into a stable polygonal honeycomb structure, the sharp corners of the fixed points of each polygon are rounded, and the internal vertical beam is connected with the top point of each polygonal honeycomb, so that the internal beam has good compression resistance, shear resistance and torsion resistance, strong mechanical stability and large space capacity. The front part is provided with an operation tool interface, which is convenient for operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

Fig. 1 is a schematic view of an overall structure of an anterior cervical interbody fusion cage according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a base body of an anterior cervical interbody fusion cage according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a trabecular bone structure of an anterior cervical interbody fusion cage according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a single dodecahedron of the multi-hole anterior lumbar interbody fusion cage according to the embodiment of the present invention.

In the figure: the bone grafting instrument comprises a base body 1, a porous bone trabecula structure 2, an operation tool interface 3, a square through hole 4, a hexagonal through hole 5, a polygonal through hole 6, a square cavity channel 7, an arc cavity channel 8, a vertical beam 11 and a cross beam 12.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings and detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

The utility model provides an anterior cervical interbody fusion cage, please refer to fig. 1, which comprises a base body 1 for supporting and a porous bone trabecular structure 2 for bone ingrowth, wherein the porous bone trabecular structure 2 is connected to the inside 1 of the base body; the substrate 1 is in a square structure, and four corners of the square are arc chamfers; the interior of the matrix 1 is of a cavity structure; the front end face of the base body 1 is provided with an operation tool interface 3, the other three end faces of the base body 1 and four arc-shaped chamfer measuring faces of the base body 1 are respectively provided with two square through holes 4, and the two square through holes 4 are arranged in parallel; the top surface of the base body 1 is provided with five hexagonal through holes 5 penetrating to the bottom; the top of the base body 1 is provided with a polygonal through hole 6 penetrating to the bottom at a position far away from the surgical tool interface 3.

Further, one of the five hexagonal through holes 5 is located at the center of the base body, the other four hexagonal through holes are evenly distributed at four arc-shaped chamfers close to the base body 1, the sectional area of the polygonal through hole 6 is one half of that of the hexagonal through hole 6, the surgical tool interface 3 is a threaded interface, the left side and the right side of the surgical tool interface are respectively provided with a square cavity channel 7 penetrating through the base body 1, and one end, far away from the surgical tool interface 3, of the square cavity channel 7 is provided with an arc-shaped cavity channel 8 penetrating through the base body 1. The surgical tool interface is enlarged, the operation space is enlarged, and the surgical operation is convenient.

Preferably, as shown in fig. 2, the base 1 is provided with a plurality of vertical beams 11 and a plurality of cross beams 12, the vertical beams 11 are vertically connected at the corners of the hexagonal through hole 5, two ends of the cross beam 12 are fixedly connected with the vertical beams 11 at two ends of each side of the hexagonal through hole 5, and the cross beam 12 is located at the midpoint of the vertical beam 11.

Referring to fig. 3 and 4, the porous trabecular bone structure is formed by cross-linking a plurality of dodecahedral structures, the porosity of the porous trabecular bone structure is 60-90%, the pore size is 500-.

The anterior cervical interbody fusion cage has high fusion speed, does not need bone grafting (or needs a small amount of bone grafting), and is not easy to cause centrum sedimentation; the bone is formed by the matrix which plays a supporting role and the porous bone trabecular structure which is suitable for bone ingrowth and mutually interweaves. The matrix bears most of the compression force, shearing force, lateral bending force and torsion force transmitted by the upper and lower vertebral bodies. The porous bone trabecular structure has the bone induction function, induces the bone of the upper and lower end plates to grow in, and finally fuses the upper and lower vertebral bodies.

The five hexagonal honeycomb holes on the periphery of the matrix are filled with porous bone trabeculae, and the hexagonal honeycomb in the middle can be filled with the bone trabeculae or made into a bone grafting bin as required.

The internal beam is designed into a stable hexagonal honeycomb structure, the hexagon fixed point sharp corners are rounded, the internal vertical beam is connected with the top point of each hexagonal honeycomb, and the internal vertical beam has good compression resistance, shear resistance and torsion resistance, strong mechanical stability and large space capacity reserved for the porous bone trabecula. The front part is provided with an operation tool interface, which is convenient for operation.

The upper surface and the lower surface of the fusion cage are fully attached to the end plate, and no bone grafting bin (or a small bone grafting bin) is arranged, so that the fusion cage has a large contact surface area with the end plate and is not easy to generate centrum sedimentation.

The equivalent elastic modulus of the whole structural unit is close to that of human bones (the elastic modulus of cancellous bones is 0.5-3 GPa, and the elastic modulus of cortical bones is 12-18 GPa), so that the stress shielding effect can be avoided, and the fusion rate is accelerated.

The anterior cervical interbody fusion cage is manufactured by adopting intelligent manufacturing modes such as SLM and EBM, is made of medical biocompatible materials (TC4, TA4, PEEK, Ta alloy and the like), has high strength and mechanical properties close to those of human bones, and has the characteristics of fatigue resistance, corrosion resistance, excellent biocompatibility and the like. Through strict testing and screening, materials meeting human body requirements are selected finally, after design optimization, a 3D printing anterior cervical interbody fusion cage model suitable for a patient is designed, preprocessing such as optimization and slicing is carried out before printing, a slice file is guided into a 3D printer with set parameters, a printing system generates sliced plane geometric information in a computer according to the anterior cervical interbody fusion cage, and after one layer is sintered, the substrate is descended by one layer until the whole fusion cage is sintered. The fusion cage needs no bone grafting or needs a small amount of bone grafting, and avoids the damage or rejection reaction of the bone taking area. The contact area between the upper surface and the lower surface of the fusion cage and the end plate is large, and the occurrence of vertebral body subsidence can be effectively reduced. On the premise of ensuring the strength, the fusion cage has the advantages that the elasticity of the material is close to that of human bones, the stress shielding is avoided, the bone conduction and bone induction effects are realized, and the vertebral body fusion speed is higher. The material has high utilization rate, can be used for manufacturing a complex porous structure of the anterior cervical interbody fusion cage, and has the characteristics of high manufacturing precision of the anterior cervical interbody fusion cage and the like.

The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.

Claims

1. An anterior cervical interbody cage comprising a base for support and a cancellous bone trabecular structure for bone ingrowth connected to the interior of the base; the substrate is of a square structure, and four corners of the square are arc chamfers; the interior of the matrix is of a cavity structure; the front end face of the base body is provided with an operation tool interface, the other three end faces of the base body and four arc-shaped chamfer measuring faces of the base body are respectively provided with two square through holes, and the two square through holes are arranged in parallel; the top surface of the base body is provided with five hexagonal through holes penetrating to the bottom; and a polygonal through hole penetrating to the bottom is formed in the position, far away from the surgical tool interface, of the top of the base body.

2. An anterior cervical interbody cage according to claim 1, wherein one of the five hexagonal through holes is located at the center of the base, and the other four hexagonal through holes are evenly distributed near the four rounded corners of the base.

3. An anterior cervical interbody cage according to claim 2, wherein the cross-sectional area of the polygonal through-hole is one-half of the cross-sectional area of the hexagonal through-hole.

4. The anterior cervical interbody fusion cage of claim 1, wherein the surgical tool interface is a screw interface, and the left and right sides of the surgical tool interface are respectively provided with a square channel penetrating into the base, and one end of the square channel away from the surgical tool interface is provided with an arc channel penetrating into the base.

5. An anterior cervical interbody cage according to claim 3, wherein the base is provided with vertical beams and cross beams.

6. An anterior cervical interbody cage according to claim 5, wherein the vertical beams are vertically connected at the corners of the hexagonal through-holes.

7. The anterior cervical interbody fusion cage of claim 6, wherein the two ends of the cross beam are fixedly connected to the vertical beams at the two ends of each side of the hexagonal through hole.

8. An anterior cervical interbody cage as claimed in claim 7, wherein the cross beam is at a midpoint of the vertical beams.

9. An anterior cervical interbody cage according to claim 1, wherein the cancellous bone trabecular structure is formed by cross-linking a plurality of dodecahedral structures.

10. The anterior cervical interbody fusion cage of claim 9, wherein the porosity of the porous trabecular bone structure is 60-90%, the pore size is 500-.