CN210204992U

CN210204992U - Lumbar vertebrae side way interbody fusion cage

Info

Publication number: CN210204992U
Application number: CN201920808351.3U
Authority: CN
Inventors: Jianpeng Zhang; 张建鹏; Ning Wang; 王宁; Jiabin Li; 李佳宾; Guisheng Zong; 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: 2020-03-31
Anticipated expiration: 2029-05-30

Abstract

The embodiment of the utility model discloses a lumbar vertebrae lateral way interbody fusion cage, which comprises a basal body for supporting and a porous bone trabecula structure for bone ingrowth, wherein the inside of the basal body is of a cavity structure, and the porous bone trabecula structure is connected with the inside of the basal body; the whole substrate is of a rectangular structure, and the vertical sectional area of the substrate is gradually reduced from the middle part to the two ends; the top of the base body is provided with a plurality of hexagonal through holes penetrating to the bottom; square holes communicated with the inside of the base body are formed in four side surfaces of the base body; the left end of the base body is integrally connected with a prismatic table, and the left end face of the prismatic table is provided with an operation tool interface; the front side and the rear side of the prismatic table are respectively provided with a bayonet penetrating through the left end face of the prismatic table; the whole matrix is of a rectangular structure, the vertical sectional area of the matrix is gradually reduced from the middle part to the two ends to be matched with the lumbar lateral intervertebral, and the lumbar lateral intervertebral is suitable for treatment of the lumbar lateral intervertebral of a human body and improves the treatment effect.

Description

Lumbar vertebrae side way interbody fusion cage

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to lumbar vertebrae side way interbody fusion cage.

Background

The lumbar lateral intervertebral fusion device is an orthopedic implant for treating diseases such as lumbar intervertebral disc protrusion, intervertebral disc source pain, lumbar vertebra segment instability, mild and moderate lumbar spinal stenosis, spine unbalance or deformity of the true sagittal position and the coronal position, degenerative lumbar spondylolisthesis, lumbar lateral kyphosis and the like.

The doctor firstly takes a standard right lateral decubitus position for the patient, utilizes the Kirschner wire perspective imaging to determine the position of a responsibility segment, confirms the position of an incision, uses the position of the front edge of the psoas major as an ideal initial position of a probe in an intervertebral space, places a retractor, ensures that an opening of the retractor is parallel to the intervertebral space, removes end plates and intervertebral disc cartilages, and selects a fusion device with a relatively larger size for implantation.

The traditional lumbar lateral 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 lumbar lateral interbody fusion cage is difficult to optimize for the individual differences of patients, so that the problems of settlement, fatigue failure and the like easily occur after some lumbar lateral 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 a lumbar vertebrae side way interbody fusion cage to solve among the prior art lumbar vertebrae side way interbody fusion cage bone grafting volume more, centrum subside 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: a lumbar lateral intervertebral fusion cage comprises a matrix for supporting and a porous bone trabecular structure for bone ingrowth, wherein the matrix is internally provided with a cavity structure, and the porous bone trabecular structure is connected to the matrix; the whole substrate is of a rectangular structure, and the vertical sectional area of the substrate is gradually reduced from the middle part to the two ends; the top of the base body is provided with a plurality of hexagonal through holes penetrating to the bottom; square holes communicated with the inside of the base body are formed in four side surfaces of the base body; the left end of the base body is integrally connected with a prismatic table, and the left end face of the prismatic table is provided with an operation tool interface; the front side and the rear side of the frustum pyramid are respectively provided with a bayonet penetrating through the left end face of the frustum pyramid.

Further, the diameter of the hexagonal through hole in the center of the top of the base body is larger than the diameters of the rest hexagonal through holes.

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 end part of the cross beam is positioned at the middle point of the vertical beam.

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

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

Further, the matrix is made of medical biocompatible materials.

Further, sharp corners of the hexagonal through hole are rounded.

The embodiment of the utility model provides a have following advantage: the matrix is integrally in a rectangular structure, the vertical sectional area of the matrix is gradually reduced from the middle part to the two ends to be matched with the lumbar lateral intervertebral, and the matrix is suitable for the lumbar lateral intervertebral treatment of a human body and improves the treatment effect; the support structure in the lumbar lateral spine bears most of the compressive, shear, lateral and torsional forces transmitted by the upper and lower vertebral bodies. 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 the overall structure of a lumbar lateral interbody fusion cage according to an embodiment of the present invention;

fig. 2 is a schematic sectional view of a base body of a lumbar lateral interbody fusion cage according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a porous bone trabecula of the lumbar lateral interbody fusion cage according to the 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, a hexagonal through hole 3, a square hole 6, an operation tool interface 7, a prismatic table 4, a bayonet 5, 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 lumbar vertebrae lateral intervertebral fusion device provided in embodiment 1 of the present invention, please refer to fig. 1, includes a base body 1 for supporting and a porous bone trabecular structure 2 for bone ingrowth, wherein the base body 1 has a hollow structure, and the porous bone trabecular structure 2 is connected to the base body 1; the whole base body 1 is of a rectangular structure, and the vertical sectional area of the base body 1 is gradually reduced from the middle part to two ends; the top of the base body 1 is provided with a plurality of hexagonal through holes 3 which penetrate through to the bottom; the four side surfaces of the matrix 1 are provided with square holes 6 communicated with the inside of the matrix 1; the left end of the base body 1 is integrally connected with a prismatic table 4, and the left end face of the prismatic table 4 is provided with an operation tool interface 7; the front side and the rear side of the frustum pyramid 4 are respectively provided with a bayonet 5 penetrating through the left end face of the frustum pyramid 4.

The matrix is integrally in a rectangular structure, the vertical sectional area of the matrix is gradually reduced from the middle part to the two ends to be matched with the lumbar lateral intervertebral, and the matrix is suitable for the lumbar lateral intervertebral treatment of a human body and improves the treatment effect; the support structure in the lumbar lateral spine bears most of the compressive, shear, lateral and torsional forces transmitted by the upper and lower vertebral bodies. 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.

It should be noted that the diameter of the hexagonal through hole 3 located at the center of the top of the base 1 is larger than the diameter of the remaining hexagonal through holes 3.

Preferably, as shown in fig. 2, the base body 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 3, 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 3, and the end of the cross beam 12 is located at the midpoint of the vertical beam 11. The matrix 1 is made of medical biocompatible material, and the sharp corners of the hexagonal through holes 3 are rounded.

The internal crossbeam of base member designs for stable polygon honeycomb structure, and the summit of every polygon fixed point apex angle department radius, and every polygon honeycomb's summit is connected to inside vertical beam, and it has good resistance to compression, shear and torsion ability, and mechanical stability is strong and space capacity is big. The front part is provided with an operation tool interface, which is convenient for operation. The internal crossbeam of the base body is designed into a stable hexagonal honeycomb structure, and the sharp corners of the hexagon are rounded. The internal vertical beams are connected with the top points of each hexagonal honeycomb, so that the compression resistance, the shearing resistance and the torsion resistance are improved, the mechanical stability is high, and the space capacity is large.

Preferably, as shown in fig. 3 and 4, the porous trabecular bone structure 2 is formed by cross-linking a dodecahedron structure, the porosity of the porous trabecular bone structure is 60-90%, the pore size is 500-.

The five hexagonal honeycomb holes on the periphery of the bearing structure are filled with porous bone trabeculae, and the middle holes can be filled with the bone bearing structure trabeculae or made into bone grafting bins according to requirements.

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

The material of the porous oblique side interbody fusion cage is medical biocompatible material (TC4, TA4, PEEK, Ta alloy and the like), has high strength and mechanical property close to that of human skeleton, and has the characteristics of fatigue resistance, corrosion resistance, excellent biocompatibility and the like. After strict testing and screening, materials meeting human body requirements are selected finally, after design optimization, a 3D printing porous oblique side 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 led into a 3D printer with set parameters, a printing system generates sliced plane geometric information in a computer according to the oblique side interbody fusion cage, and after each layer is sintered, a substrate is descended by one layer until the whole fusion cage is sintered.

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. The lumbar lateral interbody fusion cage is characterized by comprising a matrix for supporting and a porous bone trabecular structure for bone ingrowth, wherein the matrix is internally provided with a cavity structure, and the porous bone trabecular structure is connected to the matrix; the whole substrate is of a rectangular structure, and the vertical sectional area of the substrate is gradually reduced from the middle part to the two ends; the top of the base body is provided with a plurality of hexagonal through holes penetrating to the bottom; square holes communicated with the inside of the base body are formed in four side surfaces of the base body; the left end of the base body is integrally connected with a prismatic table, and the left end face of the prismatic table is provided with an operation tool interface; the front side and the rear side of the frustum pyramid are respectively provided with a bayonet penetrating through the left end face of the frustum pyramid.

2. The lateral lumbar interbody fusion cage of claim 1, wherein the hexagonal through-hole at the center of the top of the base has a diameter larger than the remaining hexagonal through-holes.

3. The lateral lumbar interbody fusion cage of claim 1, wherein the base has vertical beams and cross beams.

4. The lateral lumbar interbody fusion cage of claim 3, wherein the vertical beams are vertically connected at corners of the hexagonal through-holes.

5. The lateral lumbar interbody fusion cage of claim 4, 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.

6. The lateral lumbar interbody cage of claim 5, wherein the ends of the cross beam are at a midpoint of the vertical beam.

7. The lateral lumbar interbody fusion cage of claim 6, wherein the cancellous bone trabecular structure is cross-linked by a dodecahedral structure.

8. The lateral lumbar interbody fusion cage according to claim 7, wherein the porosity of the porous trabecular bone structure is 60-90%, the pore size is 500-.

9. The lateral lumbar interbody fusion cage of claim 8, wherein the matrix is made of a biocompatible material for medical use.

10. The lateral lumbar interbody cage of claim 8, wherein the hexagonal through-holes are rounded at sharp corners.