CN221512329U - Crown-shaped surface mortise-tenon spliced type allogeneic bone cervical vertebra interbody fusion cage - Google Patents

Abstract

The utility model discloses a crown-face mortise-tenon spliced type allogenic bone cervical vertebra interbody fusion cage which comprises an interbody fusion cage body, wherein two end surfaces of the interbody fusion cage body are parallel to each other, two side surfaces of the interbody fusion cage body are connected with two end surfaces of the interbody fusion cage body through arc surfaces, the interbody fusion cage body comprises a front part and a rear part, the front part and the rear part are connected through mortise-tenon joints, one end of the front part is provided with a tenon structure, two side surfaces of the tenon structure are symmetrically arranged, and each of two side surfaces of the tenon structure is obliquely arranged at 75 degrees. The front part and the rear part are spliced through a mortise and tenon structure, so that the requirements of the length, width and height of an intervertebral space are met, and the utilization rate of the raw materials of the allograft bone is improved; the stress on the front part can be transferred to the rear part through the mortise and tenon structure, so that effective mechanical stimulation is formed, and the continuous mechanical stimulation on the rear part is beneficial to the generation of new bone and increases the postoperative fusion rate.

Description

Crown-shaped surface mortise-tenon spliced type allogeneic bone cervical vertebra interbody fusion cage

Technical Field

The utility model relates to the technical field of medical appliances, in particular to a crown-shaped face tenon-and-mortise spliced type allograft cervical vertebra interbody fusion cage.

Background

The intervertebral fusion device is a common surgical instrument related to cervical disc operation, and has the function of replacing the intervertebral disc tissue excised in the operation and effectively supporting the vertebral bodies above and below the operation section. The common interbody fusion cage is in a ring-shaped structure on the cross section, is hollow in the center and is used for filling bone tissues, so that conditions are provided for postoperative bone regeneration; the upper and lower surfaces of the sagittal plane form an included angle of 5 degrees, which is used for maintaining the normal physiological curvature of the cervical vertebra. The materials of the prior clinical common interbody fusion device comprise polyether ether ketone (PEEK) and titanium alloy, are artificial synthetic materials, are usually integrated, and are cast into different specifications according to the anatomical dimensions of the intervertebral space of a human body. However, there are two main problems with the above two materials: first, PEEK material and titanium alloy osteogenesis ability are poor, and later healing mainly relies on the bone tissue that fills in the interbody fusion cage, so the fusion area is less, and the postoperative easily leads to the formation of prosthetic joint. Secondly, the PEEK material and the titanium alloy have large elastic modulus and human bone difference, and due to the existence of stress shielding, the bone tissue filled in the interbody fusion cage cannot obtain effective stress stimulation, and the bone regeneration is limited.

The allogenic bone material interbody fusion cage is widely applied to clinic, the osteogenesis activity and the like of the allogenic bone material interbody fusion cage are superior to those of PEEK material and titanium alloy, and a fibula ring is adopted as the cervical vertebra interbody fusion cage in the past. The cross section of the porous ceramic material is in an irregular annular structure, and the center of the porous ceramic material is hollow and is used for filling bone tissues such as cancellous bone and the like. Or ilium blocks are used as interbody fusion cage, typically two-sided cortical bone, or three-sided cortical bone, with cancellous bone in the center. The application of the interbody fusion cage made of allogeneic bone materials has the main defects that the raw materials require large and finished cortical bone pieces and come from specific parts. Bone tissue which does not meet specific requirements is difficult to process and use, and thus, great waste of raw materials is caused.

The stress shielding masks adverse effects on cancellous bone osteogenesis. It is widely accepted by clinical workers that appropriate stress aids in bone tissue regeneration, stress shielding means that when two or more materials of different stiffness together bear an external force, the material with the higher stiffness will bear more stress, while the material with the lower stiffness only bears less stress. Because the rigidity of PEEK material, titanium alloy and cortical bone and cancellous bone with osteogenesis are greatly different, cancellous bone tissue filled between the interbody fusion cage cannot obtain effective stress stimulation, and the growth of the cancellous bone tissue is limited.

Disclosure of utility model

The utility model aims to provide a coronal surface mortise-tenon joint type allogenic bone cervical vertebra interbody fusion cage which is used for solving the technical problems.

The technical scheme adopted by the utility model is as follows:

The utility model provides a coronal face tenon fourth of twelve earthly branches concatenation formula allograft cervical vertebra intervertebral fusion ware, includes intervertebral fusion ware main part, the both ends surface of intervertebral fusion ware main part is parallel to each other, the both sides surface of intervertebral fusion ware main part with connect through the arc surface between the both ends surface of intervertebral fusion ware main part, the intervertebral fusion ware main part includes anterior part and rear portion, anterior part with connect through the tenon fourth of twelve earthly branches between the rear portion, the one end of anterior part is equipped with the tenon structure, the both sides surface of tenon structure is the symmetry setting, just each of the both sides surface of tenon structure is 75 slope setting.

Preferably, one end of the rear portion is provided with a mortise structure, the mortise structure is inserted into the mortise structure, two side inner walls of the mortise structure are symmetrically arranged, and each of two side inner walls of the mortise structure is obliquely arranged at 75 degrees.

Preferably, the angle between the two side surfaces of the main body and the other end surface of the front part is 87-88 degrees.

Preferably, the angle between the two side surfaces of the main body and the surface of the other end of the rear part is 92-93 degrees.

Preferably, an included angle between the upper surface of the interbody fusion cage body and the lower surface of the interbody fusion cage body is 4-6 °.

Preferably, the radius of the arc surface between the two side surfaces of the main body and the surface of one end of the main body is 4.5cm.

Preferably, the radius of the arc surface between the two side surfaces of the main body and the surface of the other end of the main body is 1.5cm.

Preferably, the anterior portion is made of allogeneic cortical bone mass.

Preferably, the posterior portion is made of allogeneic cancellous bone stock.

Preferably, the upper surface of the main body of the interbody fusion cage and the lower surface of the main body of the interbody fusion cage are provided with a plurality of grooves.

The technical scheme has the following advantages or beneficial effects:

In the utility model, the front part and the rear part of the main body of the interbody fusion cage are spliced through the mortise and tenon structure, thereby meeting the requirements on length, width and height of the intervertebral space, realizing the utilization of smaller bone blocks in the interbody fusion cage and improving the utilization rate of raw materials of allogeneic bones; the rear part of the intervertebral fusion device is integrally made of allogeneic cancellous bone blocks, compared with the traditional central filling cancellous bone, the cancellous bone can bear stress, meanwhile, due to the tenon-and-mortise structure, the stress born by the front part can be transferred to the rear part through the tenon-and-mortise structure, so that effective mechanical stimulation is formed, continuous mechanical stimulation of the rear part is beneficial to generation of new bone, and the postoperative fusion rate is increased.

Drawings

FIG. 1 is a schematic diagram of a crown face mortise and tenon joint type allograft cervical vertebra interbody fusion cage of the present utility model;

Fig. 2 is a plan view of a coronal plane mortise and tenon joint type allograft cervical vertebra interbody fusion cage of the present utility model.

In the figure: 1. an interbody cage body; 2. a front portion; 3. a rear portion; 4. an arc surface; 5. a tenon structure; 6. mortise structure; 7. a groove; 8. a spiral hole.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.

In the description of the present utility model, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Fig. 1 is a schematic structural view of a coronal plane mortise-tenon joint type allogeneic cervical vertebra interbody fusion cage according to the present utility model, fig. 2 is a plan view of a coronal plane mortise-tenon joint type allogeneic cervical vertebra interbody fusion cage according to the present utility model, please refer to fig. 1-2, which shows a preferred embodiment, and a coronal plane mortise-tenon joint type allogeneic cervical vertebra interbody fusion cage is shown, which comprises an interbody fusion cage body 1, two end surfaces of the interbody fusion cage body 1 are parallel to each other, two side surfaces of the interbody fusion cage body 1 are connected with two end surfaces of the interbody fusion cage body 1 through arc surfaces 4, the interbody fusion cage body 1 comprises a front part 2 and a rear part 3, and the front part 2 is connected with the rear part 3 through mortise-tenon joints. In this embodiment, the interbody fusion cage body 1 is composed of front and rear parts, wherein one end of the front part 2 is provided with a tenon structure 5, one end of the rear part 3 is provided with a mortise structure 6, the tenon structure 5 is inserted into the mortise structure 6, so that the front part 2 and the rear part 3 are spliced with each other, and two end surfaces of the interbody fusion cage body 1 refer to the other end surface of the front part 2 and the other end surface of the rear part 3.

In this embodiment, the front part 2 and the rear part 3 of the interbody fusion cage body 1 are connected through the mortise and tenon structure 6, so that the use of biological adhesives and the like is avoided, and the interbody fusion cage has a certain mechanical conduction function, and can transfer the acting force received by the front part 2 to the rear part 3, so that the effective mechanical stimulation is formed.

A screw hole 8 is provided in the main body 1 of the interbody fusion device, and the screw hole 8 penetrates the front and rear portions 2 and 3 as shown in fig. 1.

The anterior portion 2 in this example is cortical bone, 8.5cm in length, and the posterior portion 3 is cancellous bone, 6.5cm in length. The specific length of cortical bone and cancellous bone can be tailored as desired.

Wherein the anterior portion 2 is made of allogeneic cortical bone, and the posterior portion 3 is made of allogeneic cancellous bone, providing sufficient compressive strength to the intervertebral cage body 1, and allowing the intervertebral cage body 1 to be driven into the intervertebral disc space by a knock-in during use.

Further, as a preferred embodiment, the angle between the both side surfaces of the main body 1 of the interbody fusion cage and the other end surface of the anterior portion 2 is 87-88 °. In this embodiment, the angle between the two side surfaces of the main body 1 and the other end surface of the front portion 2 may be preferably 87.5 °, and the specific angle may be selected as required.

Further, as a preferred embodiment, the angle between the two side surfaces of the main body 1 of the interbody fusion cage and the surface of the other end of the rear portion 3 is 92-93 °. The included angle between the two side surfaces of the main body 1 of the intervertebral fusion device and the surface of the other end of the rear part 3 is preferably 92.5 degrees, and the specific angle can be selected according to the requirement.

Further, as a preferred embodiment, the angle between the upper surface of the main body 1 of the interbody fusion cage and the lower surface of the main body 1 of the interbody fusion cage is 4-6 °. Wherein the angle between the upper surface of the intersomatic cage body 1 and the lower surface of the intersomatic cage body 1 is preferably chosen to be 5 deg..

Further, as a preferred embodiment, the radius of the circular arc surface 4 between the both side surfaces of the inter-vertebral fusion device body 1 and the surface of one end of the inter-vertebral fusion device body 1 is 4.5cm.

Further, as a preferred embodiment, the radius of the circular arc surface 4 between the both side surfaces of the inter-vertebral fusion device body 1 and the surface of the other end of the inter-vertebral fusion device body 1 is 1.5cm. The radius of the circular arc surface 4 in this embodiment can be selected as required.

Further, as a preferred embodiment, a plurality of grooves 7 are formed on the upper surface of the main body 1 of the interbody fusion apparatus and the lower surface of the main body 1 of the interbody fusion apparatus. Because the rigidity of the allogeneic bone is smaller, the allogeneic bone is easy to break at the sharp point, and the grooves 7 are formed on the basis, so that the friction force between the interbody fusion cage and the surfaces of the upper and lower vertebral bodies can be increased, and the occurrence of postoperative displacement is reduced.

Referring to fig. 2, each of the two side surfaces of the tenon structure 5 is inclined at 75 °, and each of the two side inner walls of the mortise structure 6 is also inclined at 75 °, so that the tenon structure 5 and the mortise structure 6 cooperate with each other at an angle of 75 °, so that a more efficient mechanical transmission effect can be achieved, and when the front portion 2 of the interbody cage body 1 is subjected to stresses from the upper and lower vertebral bodies, the stresses can be more effectively transmitted to the rear portion 3 through the tenon-mortise structure (tenon structure 5 and mortise structure 6), instead of the rear portion 3 itself being directly subjected to the stresses, thereby ensuring an effective transmission of the stresses. At the same time, with 75 ° fit, the trailing edge of the posterior portion 3 is minimally stressed from the upper and lower vertebral bodies, reducing the risk of collapse.

Because the five-angle splicing mode is adopted. When 75 degrees are adopted, the stress at the joint of the mortise and tenon joint structure is maximum, and the stress born by the rear edge of the rear part 3, namely the rear edge of the cancellous bone, is minimum.

In the embodiment, the mortise and tenon joint structure is applied to the allogeneic bone cervical vertebra interbody fusion cage, so that the utilization of smaller bone blocks is realized. The allogenic bone cervical vertebra interbody fusion cage in the prior art is mostly derived from specific anatomical parts, such as ilium and fibula, and has less utilization of bone blocks at other parts. Because the length, width and height of the human body intervertebral space are all larger than the product average thickness of the human body cortical bone, only the allogeneic bone with specific position and specific shape can be adopted, and the allogeneic bone interbody fusion cage is obtained after processing. In this embodiment, processing the one end of less bone piece into tenon form, mortise and tenon form, carry out two liang concatenation, satisfy the length wide high demand of intervertebral space. Realizes the utilization of smaller bone blocks in the interbody fusion cage and improves the utilization rate of the raw materials of the allogeneic bone.

In this embodiment, the allograft cervical interbody fusion cage is more closely attached to the anatomy of the human body intervertebral space. The PEEK and titanium alloy interbody fusion cage is synthesized artificially, so that the plasticity is high, and the prepared interbody fusion cage is more in line with the anatomy structure of human body intervertebral space. However, allograft bone is a natural material with low plasticity. The prior clinical allograft intervertebral fusion device usually adopts fibula rings and ilium blocks, and the anatomical difference between the fibula rings and ilium blocks and human body intervertebral space is still larger after polishing. In this embodiment, the ossicle pieces are spliced, so that the shape of the bone can be fully processed, and the bone is more close to the anatomical structure of the intervertebral space.

In this embodiment, stress shielding is improved against cancellous bone osteogenesis. Because of the physiological curvature of the cervical spine, stresses are often distributed at the posterior edge of the cage. In this embodiment, cancellous bone is placed in the posterior portion of the cage, which is subjected to stresses comparable to conventional center-filled cancellous bone. Meanwhile, due to the existence of the mortise and tenon structure 6, the stress born by the cortical bone can be transferred to the cancellous bone of the connecting part through the mortise and tenon structure 6, so that effective mechanical stimulation is formed. The continuous mechanical stimulation of cancellous bone is beneficial to the generation of new bone and increases the fusion rate after operation.

In this embodiment, the stress shielding brings about the firmness of the support. Cancellous bone has good osteogenic activity but lacks effective mechanical support, and thus it is generally believed that cancellous bone cannot serve as a load-bearing structure, particularly in the posterior portion of an intervertebral cage. However, because of the existence of the stress shielding, when the cancellous bone and the cortical bone bear weight at the same time, most of stress can act on the cortical bone, and the stress born by the cancellous bone is relatively limited, so that firm mechanical support can be realized without collapse of the cancellous bone part to reduce the height of the intervertebral space.

A larger interbody fusion area is provided in this embodiment. Post-operative intervertebral fusion occurs across the intervertebral space. Conventional interbody fusion devices are annular in cross-section, with the annular structure occupying a majority of the cross-sectional contact area. And because of poor regeneration capability of the bone made of the self-material, the fusion after operation depends on the cancellous bone filled in the center. The materials in this embodiment are cortical bone and cancellous bone, and cancellous bone has good osteogenesis and bone regeneration effects in early postoperative period. The cortical bone can be gradually replaced by the new bone according to the creeping replacement theory in a long term after operation, so that the fusion of the total area can be realized, the postoperative fusion rate is improved, and the risk of secondary operation is reduced.

The foregoing description is only illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the scope of the utility model, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present utility model, and are intended to be included within the scope of the present utility model.

Claims (9)

1. The utility model provides a coronal face tenon fourth of twelve earthly branches concatenation formula allograft cervical vertebra intervertebral fusion ware, its characterized in that, including intervertebral fusion ware main part, the both ends surface of intervertebral fusion ware main part is parallel to each other, the both sides surface of intervertebral fusion ware main part with be connected through the circular arc face between the both ends surface of intervertebral fusion ware main part, the intervertebral fusion ware main part includes anterior part and rear portion, anterior part with connect through the tenon fourth of twelve earthly branches between the rear portion, the one end of anterior part is equipped with the tenon structure, the both sides surface of tenon structure is the symmetry setting, just each of the both sides surface of tenon structure is 75 slope setting, the one end of rear portion is equipped with the mortise structure, the tenon structure inserts in the mortise structure, the both sides inner wall of mortise structure is the symmetry setting, just each of the both sides inner wall in the mortise structure is 75 slope setting.

2. The coronal plane mortise and tenon joint type allograft cervical vertebrae interbody fusion cage according to claim 1, wherein an included angle between both side surfaces of the interbody fusion cage body and the other end surface of the front portion is 87-88 °.

3. The coronal plane mortise and tenon joint type allograft cervical vertebrae interbody fusion cage according to claim 1, wherein an angle between both side surfaces of the interbody fusion cage body and a surface of the other end of the rear portion is 92-93 °.

4. The coronal plane mortise and tenon joint type allograft cervical vertebrae inter-vertebral fusion device according to claim 1, wherein an included angle between an upper surface of the inter-vertebral fusion device body and a lower surface of the inter-vertebral fusion device body is 4-6 °.

5. The coronal mortise and tenon joint type allograft cervical vertebrae inter-vertebral fusion device according to claim 1, wherein a radius of an arc surface between both side surfaces of the inter-vertebral fusion device body and a surface of one end of the inter-vertebral fusion device body is 4.5cm.

6. The coronal plane mortise and tenon joint type allograft cervical vertebrae inter-vertebral fusion device according to claim 1, wherein a radius of an arc surface between both side surfaces of the inter-vertebral fusion device body and a surface of the other end of the inter-vertebral fusion device body is 1.5cm.

7. The coronal mortise and tenon joint type allogeneic bone cervical vertebra interbody fusion cage of claim 1, wherein the anterior segment is made of allogeneic cortical bone block material.

8. The coronal mortise and tenon joint type allograft cervical spine fusion cage according to claim 1 wherein the rear portion is made of allograft cancellous bone block material.

9. The coronal plane mortise and tenon joint type allogeneic bone cervical vertebra interbody fusion cage according to claim 1, wherein a plurality of grooves are formed on the upper surface of the interbody fusion cage body and the lower surface of the interbody fusion cage body.