CN112773578B

CN112773578B - Lumbar vertebra fusion cage

Info

Publication number: CN112773578B
Application number: CN202110179472.8A
Authority: CN
Inventors: 王冰; 邝磊; 闫伟; 赵亚杰; 张凯飞
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Second Xiangya Hospital of Central South University; Beijing AK Medical Co Ltd
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2022-08-16
Anticipated expiration: 2041-02-09
Also published as: CN112773578A

Abstract

The invention provides a lumbar fusion cage, comprising: a substrate; the first connecting hole penetrates through the base body, a first end of the first connecting hole is arranged on the side wall of the base body, and a second end of the first connecting hole is arranged on the upper surface of the base body; the first end of the second connecting hole is arranged on the side wall of the base body, and the second end of the second connecting hole is arranged on the lower surface of the base body; the first fastener penetrates through the first end of the first connecting hole and penetrates out of the second end of the first connecting hole; the second fastening piece penetrates through the first end of the second connecting hole and penetrates out of the second end of the second connecting hole; wherein, the first end of first connecting hole and the first end of second connecting hole are located the adjacent lateral wall of base member respectively. The technical scheme of the application effectively solves the problem that the end plate is easy to damage in the related technology.

Description

Lumbar vertebra fusion cage

Technical Field

The invention relates to the technical field of medical instruments, in particular to a lumbar fusion cage.

Background

Lumbar interbody fusion is a common method for treating lumbar degenerative diseases and is widely applied to clinic. The oblique lateral lumbar interbody fusion is a new minimally invasive technology which is first reported in 2012 by Silvestre, the operation type enters the lateral side of a vertebral body from the space between the left lumbar major muscle and an abdominal aorta, a working channel is arranged, and the oblique lateral lumbar interbody fusion has the advantages of small wound, quick recovery and the like and is mainly suitable for lumbar degenerative diseases needing front decompression fusion. OLIF avoids the damage of the traditional posterior lumbar intervertebral fusion to the posterior lumbar structure and the interference to the dural sac and nerve roots.

In the related art, PEEK lumbar fusion cages have a large proportion of postoperative complications in the application of the OLIF surgery, the most common complications are endplate fractures and cage subsidence, and the incidence rate is 18.7%. The reason is that the fusion cage is not fused sufficiently with the adjacent vertebral body, so that the fusion cage is caused, or the bone grafting amount is insufficient in the operation, the contact area of the fusion cage and the end plate is small, so that the local stress of the end plate is too large, and the damage of the end plate is caused.

Disclosure of Invention

The invention mainly aims to provide a lumbar fusion cage to solve the problem that end plates are easy to damage in the related art.

In order to accomplish the above object, according to one aspect of the present invention, there is provided a lumbar fusion cage comprising: a substrate; the first connecting hole penetrates through the base body, a first end of the first connecting hole is arranged on the side wall of the base body, and a second end of the first connecting hole is arranged on the upper surface of the base body; the first end of the second connecting hole is arranged on the side wall of the base body, and the second end of the second connecting hole is arranged on the lower surface of the base body; the first fastener penetrates through the first end of the first connecting hole and penetrates out of the second end of the first connecting hole; the second fastening piece penetrates through the first end of the second connecting hole and penetrates out of the second end of the second connecting hole; wherein, the first end of first connecting hole and the first end of second connecting hole are located the adjacent lateral wall of base member respectively.

Further, lumbar vertebrae fuses ware still includes two fastening plugs, and two fastening plugs are installed respectively in the first end of first connecting hole and the first end of second connecting hole, and two fastening plugs cooperate with first fastener and second fastener butt respectively.

Furthermore, two fastening plugs are respectively in threaded connection with the first end of the first connecting hole and the first end of the second connecting hole, a mounting hole is formed in the first end of each fastening plug, and the mounting holes are hexagonal or quincuncial inner hexagons.

Further, a protrusion is arranged at the second end of the fastening plug, the first fastening piece and the second fastening piece are both screws, a concave portion is arranged on the screw heads of the screws, and the protrusion and the concave portion are in butt fit.

Further, the first and second fasteners have a first included angle a in the coronal plane S1 of the base, the first included angle a ranging between 40 ° and 60 °.

Further, the first and second fasteners have a second included angle b in the sagittal plane S2 of the base, the second included angle b ranging between 70 and 90.

Further, a third included angle c is formed between the upper surface of the substrate and the lower surface of the substrate, and the third included angle c ranges from 0 ° to 30 °.

Further, the upper surface of base member and the lower surface of base member are the arcwall face.

Furthermore, the side wall of the substrate is of a solid structure, and the upper surface of the substrate and the lower surface of the substrate are of a porous structure.

Furthermore, a positioning strip is arranged on the upper surface of the base body, a first end of the positioning strip extends to the side wall of the base body, a second end of the positioning strip is connected with a second end of the first connecting hole, a central line of the positioning strip passes through the center of the hole of the second end of the first connecting hole, meanwhile, the positioning strip penetrates through an intersection point S3 of a long axis of the base body and a short axis of the base body, a fourth included angle d is formed between the positioning strip and the long axis of the base body, and the range of the fourth included angle d is 30-50 degrees.

Further, the periphery of the second end of the first connecting hole and the second end of the second connecting hole is of a solid structure.

By applying the technical scheme of the invention, the first connecting hole and the second connecting hole penetrate through the base body, the first connecting hole penetrates through the top wall of the base body from the side wall of the base body, and the second connecting hole penetrates through the bottom wall of the base body from the side wall of the base body. The first fastener and the second fastener are respectively installed in the first connecting hole and the second connecting hole, the first fastener penetrates through the first end of the first connecting hole and penetrates out of the second end of the first connecting hole, and the second fastener penetrates through the first end of the second connecting hole and penetrates out of the second end of the second connecting hole. The first end of the first connecting hole and the first end of the second connecting hole are respectively located on the adjacent side walls of the base body. Through foretell setting, contained angle has between first fastener and the second fastener, and after the base member implanted the human body, first fastener can be connected with the centrum of base member top, and the second fastener can be connected with the centrum of base member below, can make the position of base member stable like this, and the area of the upper and lower surface of base member is great simultaneously, can have great area and centrum contact, can prevent like this that the centrum from being damaged. First fastener and second fastener penetrate by the lateral wall of base member, and such mode of setting makes the installation more convenient, reduces the operation degree of difficulty. Therefore, the technical scheme of the application effectively solves the problem that the end plate is easily damaged in the related art.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows a perspective view of a base and vertebral bodies of an embodiment of a lumbar fusion cage according to the present invention;

figure 2 shows a schematic top view of the base and vertebral bodies of the lumbar fusion cage of figure 1;

figure 3 shows a perspective view of the base of the lumbar fusion cage of figure 1;

figure 4 shows a schematic cross-sectional view in the sagittal plane of the base of the lumbar fusion cage of figure 1;

figure 5 shows a schematic top view of the base of the lumbar fusion cage of figure 1;

figure 6 shows a schematic front view of a fastening plug of the lumbar fusion cage of figure 1;

FIG. 7 shows a schematic cross-sectional view of the fastening plug of FIG. 6; and

fig. 8 shows a schematic top view of the fastening plug of fig. 6.

Wherein the figures include the following reference numerals:

10. a substrate; 20. a first connection hole; 30. a second connection hole; 40. a first fastener; 50. a second fastener; 60. a fastening plug; 61. mounting holes; 62. a protrusion; 70. and a positioning strip.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In order to avoid damage to the vertebral bodies and to improve stability of the lumbar fusion cage, as shown in fig. 1 to 5, in the present embodiment, the lumbar fusion cage comprises: a base body 10, a first connection hole 20, a second connection hole 30, a first fastener 40, and a second fastener 50. First connecting hole 20 runs through the setting on base member 10, and the first end of first connecting hole 20 sets up on the lateral wall of base member 10, and the second end of first connecting hole 20 sets up in the upper surface of base member 10. The second connection hole 30 is penetratingly disposed on the base 10, a first end of the second connection hole 30 is disposed on a sidewall of the base 10, and a second end of the second connection hole 30 is disposed on a lower surface of the base 10. The first fastening member 40 is inserted through the first end of the first connection hole 20 and is inserted through the second end of the first connection hole 20. The second fastening member 50 is inserted through a first end of the second connecting hole 30 and is inserted through a second end of the second connecting hole 30. Wherein the first ends of the first connection holes 20 and the second connection holes 30 are respectively located on adjacent sidewalls of the base body 10.

By applying the technical solution of the present embodiment, the first connection hole 20 and the second connection hole 30 both penetrate through the base body 10, the first connection hole 20 penetrates from the side wall of the base body 10 to the top wall of the base body 10, and the second connection hole 30 penetrates from the side wall of the base body 10 to the bottom wall of the base body 10. The first fastener 40 and the second fastener 50 are respectively installed in the first connection hole 20 and the second connection hole 30, the first fastener 40 penetrates through a first end of the first connection hole 20 and penetrates out of a second end of the first connection hole 20, and the second fastener 50 penetrates through a first end of the second connection hole 30 and penetrates out of a second end of the second connection hole 30. First ends of the first connection holes 20 and the second connection holes 30 are respectively located on adjacent sidewalls of the base body 10. Through the arrangement, an included angle is formed between the first fastening piece 40 and the second fastening piece 50, when the base body 10 is implanted into a human body, the first fastening piece 40 can be connected with a vertebral body above the base body 10, and the second fastening piece 50 can be connected with the vertebral body below the base body 10, so that the position of the base body 10 is stable, meanwhile, the areas of the upper surface and the lower surface of the base body 10 are large, a large area can be in contact with the vertebral body, and the vertebral body can be prevented from being damaged. The first fastener 40 and the second fastener 50 are penetrated by the side wall of the base body 10, and the arrangement mode enables installation to be more convenient and reduces operation difficulty. Therefore, the technical scheme of the embodiment effectively solves the problem that the end plate is easily damaged in the related art.

In order to prevent the first and second fastening members from being disengaged, as shown in fig. 4, 6, 7 and 8, in this embodiment, the lumbar fusion cage further includes two fastening plugs 60, the two fastening plugs 60 are respectively installed in the first ends of the first and second connection holes 20 and 30, and the two fastening plugs 60 are respectively in abutting engagement with the first and

second fastening members

40 and 50. The stability of first fastener 40 and second fastener 50 can be improved effectively in the setting of fastening stopper 60, prevents that first fastener 40 and second fastener 50 from deviating from, and fastening stopper 60 is installed to the back in first connecting hole 20 and the second connecting hole 30 simultaneously, can play the effect of supporting first connecting hole 20 and second connecting hole 30, and then can increase the structural strength of base member 10, prevents that base member 10 from damaging.

In consideration of the installation of the fastening plugs, as shown in fig. 4, 6, 7 and 8, in the present embodiment, two fastening plugs 60 are respectively threadedly coupled to the first ends of the first and second connection holes 20 and 30, and the first ends of the fastening plugs 60 are provided with installation holes 61, the installation holes 61 having a hexagonal shape. The screw joint has simple and efficient matching mode, stable connection and difficult loosening. The installation hole 61 can be installed by using a hexagon socket wrench, so that the installation is easy. Of course, the mounting hole can also be a quincuncial inner hexagon. It should be noted that the mounting hole refers to a hole forming an inner hexagon, and the quincunx inner hexagon is provided with an arc-shaped section.

In order to make the contact of the fastening plug with the first and second fasteners more tight and at the same time avoid the first and second fasteners from rotating, in the present embodiment, as shown in fig. 4, 6, 7 and 8, a protrusion 62 is provided on the second end of the fastening plug 60, and the first and

second fasteners

40 and 50 are both screws, and the heads of the screws have recesses, and the protrusion 62 and the recesses are in abutting fit. The projection 62 can abut the recess so that the projection 62 can restrict the first and

second fastening members

40 and 50 from rotating and can prevent them from loosening.

As shown in fig. 3, in the present embodiment, the first fastener 40 and the second fastener 50 have a first included angle a of 50 ° on the coronal plane S2 of the base 10, so that the lateral movement of the lumbar cage in the coronal plane S2 is limited, and the position thereof is further stabilized, thereby improving the surgical effect. Of course, the above-mentioned first included angle a can be within the range of 40 ° to 60 °. When the first included angle a is less than 40 ° or greater than 60 °, it is easy to cause the first and second fastening members 4 and 50 to penetrate the vertebral body, which affects the fixation effect and may cause damage to the vertebral body.

As shown in FIG. 4, in the present embodiment, the first fastener 40 and the second fastener 50 have a second angle b in the sagittal plane S1 of the base 10, and the second angle b is 80 degrees, so that the lumbar fusion device can be limited from traversing back and forth in the sagittal plane S1, and the position of the lumbar fusion device can be more stable, and the operation effect can be improved. Of course, the second included angle b may range from 70 ° to 90 °. The above-described advantages can be achieved. When the second included angle b is less than 70 ° or greater than 90 °, the first and

second fasteners

40 and 50 are liable to penetrate the vertebral body, affecting the fixation effect and possibly causing damage to the vertebral body.

As shown in fig. 4, in the present embodiment, a third included angle c is formed between the upper surface of the substrate 10 and the lower surface of the substrate 10, and the third included angle c ranges from 0 ° to 30 °. The above arrangement can meet the requirements of different lordotic curvatures of the lumbar spine segment, and patients with different lordotic curvatures select the base bodies 10 with different angles to restore the physiological curvature of the spine.

As shown in fig. 3 to 5, in the present embodiment, both the upper surface of the base 10 and the lower surface of the base 10 are arc-shaped surfaces. The arrangement of the arc-shaped surface can be completely the same as the anatomical structure of the adjacent vertebral body, and the arc-shaped surface can be completely attached after being implanted.

As shown in fig. 3 to 5, in the present embodiment, the sidewall of the substrate 10 has a solid structure, and the upper surface of the substrate 10 and the lower surface of the substrate 10 have a porous structure. The solid structure can improve the structural strength of the base body 10 and prevent the base body 10 from being deformed. The porous structure is similar to the bone trabecula structure of the vertebral body, and is beneficial to the growth of bone tissues. Thereby joining the vertebral body and the matrix 10 together. The substrate 10 of this embodiment is formed by 3D printing, and the solid structure and the porous structure are integrally formed.

As shown in fig. 2 and 5, in the present embodiment, the base body 10 has a positioning bar 70 on an upper surface thereof, a first end of the positioning bar 70 extends to a side wall of the base body 10, a second end of the positioning bar 70 is connected to a second end of the first connection hole 20, a center line of the positioning bar 70 passes through a center of an aperture of the second end of the first connection hole 20, meanwhile, the positioning bar 70 passes through an intersection S3 of a major axis of the base body 10 and a minor axis of the base body 10, the positioning bar 70 has a fourth included angle d with a major axis of the base body 10, and the fourth included angle d ranges from 30 ° to 50 °. The orientation of the spacer 70 is the implant direction. The positioning strip 70 can be clearly displayed in the postoperative image photo, which is helpful for observing whether the implantation position of the lumbar fusion cage is centered in the operation. Is convenient for knowing the operation effect. The fourth angle d allows the lumbar fusion cage to be implanted into the affected area on the lateral anterior approach.

As shown in fig. 2 and 5, in the present embodiment, the outer circumferences of the second ends of the first and second connection holes 20 and 30 are solid structures. The above-described arrangement is to improve the structural strength of the first connection hole 20 and the second connection hole 30.

The lumbar fusion cage of the embodiment provides sufficient contact area, the stress between the lumbar fusion cage and the adjacent vertebral body can be effectively reduced by the larger contact area, and the possibility of subsidence of the lumbar fusion cage is reduced to the maximum extent. Meanwhile, the upper surface of the lumbar fusion cage and the lower surface of the lumbar fusion cage are of porous structures, namely bone-like trabecular structures, which are similar to bone tissue structures inside the vertebral bodies, so that the growth of bone cells is induced, and a stable fusion effect is further provided. In addition, the lumbar fusion cage adopts a self-stabilizing structure design, and the lumbar fusion cage can be firmly fixed with the adjacent vertebral bodies by arranging the first fastener 40 and the second fastener 50. The fastener plug 60 can lock the first fastener 40 and the second fastener 50 to the lumbar cage to form a rigid structure. The lumbar fusion cage can still be ensured not to be displaced under the action of external force, and the fusion efficiency of the lumbar fusion cage is ensured to the maximum extent.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …", "above … …", "above … …, on a surface", "above", and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lumbar fusion cage, comprising:

a base (10);

the first connecting hole (20) is arranged on the base body (10) in a penetrating mode, a first end of the first connecting hole (20) is arranged on the side wall of the base body (10), and a second end of the first connecting hole (20) is arranged on the upper surface of the base body (10);

the second connecting hole (30) is arranged on the base body (10) in a penetrating mode, a first end of the second connecting hole (30) is arranged on the side wall of the base body (10), and a second end of the second connecting hole (30) is arranged on the lower surface of the base body (10);

the first fastener (40) penetrates through the first end of the first connecting hole (20) and penetrates out of the second end of the first connecting hole (20);

the second fastening piece (50) penetrates through the first end of the second connecting hole (30) and penetrates out of the second end of the second connecting hole (30);

wherein a first end of the first connection hole (20) and a first end of the second connection hole (30) are respectively located on adjacent side walls of the base body (10);

the lumbar fusion cage further comprises two fastening plugs (60), the two fastening plugs (60) are respectively installed in the first end of the first connecting hole (20) and the first end of the second connecting hole (30), and the two fastening plugs (60) are respectively matched with the first fastening piece (40) and the second fastening piece (50) in an abutting mode; a bulge (62) is arranged at the second end of the fastening plug (60), the first fastening piece (40) and the second fastening piece (50) are both screws, a concave part is arranged on the screw heads of the screws, and the bulge (62) is in butt fit with the concave part;

the first fastener (40) and the second fastener (50) have a first included angle a on a coronal plane S1 of the base (10), the first included angle a ranging between 40 ° and 60 °;

the first fastener (40) and the second fastener (50) have a second included angle b on a sagittal plane S2 of the base (10), the second included angle b ranging between 70 DEG and 90 deg.

2. The lumbar fusion cage according to claim 1, wherein two of the fastening plugs (60) are respectively screwed with the first end of the first connecting hole (20) and the first end of the second connecting hole (30), the first end of the fastening plug (60) is provided with a mounting hole (61), and the mounting hole (61) is a hexagon or a quincunx hexagon socket.

3. The lumbar fusion cage according to claim 1 or 2, characterized in that a third angle c is present between the upper surface of the base body (10) and the lower surface of the base body (10), said third angle c ranging between 0 ° and 30 °.

4. The lumbar fusion cage according to claim 1 or 2, characterized in that the upper surface of the base body (10) and the lower surface of the base body (10) are both arc-shaped surfaces.

5. The lumbar fusion cage according to claim 1 or 2, characterized in that the side walls of the base body (10) are of solid construction, the upper surface of the base body (10) and the lower surface of the base body (10) being of porous construction.

6. The lumbar fusion cage according to claim 1 or 2, characterized in that the base body (10) has a positioning bar (70) on the upper surface thereof, a first end of the positioning bar (70) extends to the side wall of the base body (10), a second end of the positioning bar (70) is connected with a second end of the first connection hole (20), a center line of the positioning bar (70) passes through a center of the aperture of the second end of the first connection hole (20), meanwhile, the positioning bar (70) passes through an intersection point S3 of a major axis of the base body (10) and a minor axis of the base body (10), the positioning bar (70) and the major axis of the base body (10) have a fourth included angle d, and the range of the fourth included angle d is 30 ° to 50 °.

7. The lumbar fusion cage of claim 1 or 2 wherein the second ends of the first and second connection holes (20, 30) are solid in configuration at their outer peripheries.