CN212816656U - Arched bionic cervical vertebra interbody fusion cage - Google Patents

Abstract

The utility model provides a dome-shaped bionic cervical vertebra interbody fusion cage, which comprises a fusion cage body, wherein the fusion cage body is provided with an upper dome and a lower dome which are opposite, the upper dome is consistent with the dome on the upper surface of a vertebral gap, and the lower dome is consistent with the dome on the lower surface of the vertebral gap; a plurality of bulges are respectively arranged on the upper dome and the lower dome. The fusion cage body is firmly combined with a patient, has good fixing effect and is beneficial to bone fusion.

Description

Arched bionic cervical vertebra interbody fusion cage

Technical Field

The utility model relates to the field of medical equipment, particularly, relate to a bionical cervical vertebra interbody fusion cage of vault.

Background

The cervical vertebra is an important connecting and supporting structure of the skull and the trunk of a human body, and has flexible movement and easy occurrence of degenerative and injurious diseases and the like. These diseases often result in the loss of stability and support function of the cervical spine, and even nerve or nerve root involvement, affecting the function of the trunk and limbs. The common operation modes for treating the diseases in clinic are cervical discectomy nerve decompression and fixed fusion after decompression. In a fixation fusion procedure, an intervertebral cage is the most commonly used instrument in the procedure to re-establish cervical spine stability. The clinical existing cervical interbody fusion cage is made of metal and composite materials. The composite material avoids the stress shielding of metal due to the excellent performance, and is more suitable for the requirements of human bodies. The existing artificial composite material cervical intervertebral fusion cage is mostly circular or trapezoidal, the front and the back are wedge-shaped according to the general shape of the cervical intervertebral disc, the upper and the lower surfaces are in sawtooth rotation to prevent the fusion cage from withdrawing, and autologous bone particles can be placed in the middle through a middle hole to facilitate the fusion stability.

The inventor researches and discovers that the existing cervical vertebra intervertebral fusion has the following defects:

firstly, the cervical intervertebral space is not a simple wedge with wide front and narrow back, but the upper surface and the lower surface are both irregular dome shapes, the left side and the right side further aggravate the irregularity of the dome due to the uncinate joints, the upper surface and the lower surface of the existing intervertebral fusion device can not be tightly attached to the upper surface and the lower surface of the intervertebral space, the fusion device is easy to sink, the bone healing is difficult and even fails, the cervical vertebra is formed convexly after surgery, and other treatment failure conditions are easily caused;

secondly, although the existing one-way zigzag anti-withdrawal design of the fusion cage is helpful to reduce the risk of forward withdrawal of the fusion cage, the risk of backward entry of the fusion cage into the compressed spinal cord is not reduced. The one-way zigzag design not only obviously reduces the contact surface between the fusion cage and the upper and lower surfaces of the intervertebral disc, but also increases the risk of backward displacement of the repeated micromotion fusion cage of the cervical vertebra after the operation;

thirdly, the existing fusion cage plays a supporting role, has no biological activity or extremely poor biological activity, has no bionic function, is difficult to heal, and if the bone-fusion cage interface can not form bone biological healing, bone absorption and bone necrosis are easy to occur, thereby causing the failure of operative fusion;

fourthly, the hollow big hole of the fusion cage needs a large amount of autologous bones or allogeneic bones to be filled, the autologous bone source is limited, even the bone-taking operation needs to be additionally carried out, and allogeneic bone immunoreaction still has risks, influences the bone healing and easily causes treatment failure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bionical cervical vertebra interbody fusion cage of vault, it can improve above-mentioned at least one technical problem.

The embodiment of the utility model is realized like this:

the embodiment of the utility model provides a bionical cervical vertebra interbody fusion cage of vault, include:

the fusion cage comprises a fusion cage body, wherein the fusion cage body is provided with an upper dome surface and a lower dome surface which are opposite, and a plurality of bulges are respectively arranged on the upper dome surface and the lower dome surface.

In an alternative embodiment, at least two of the plurality of embossments located on at least one of the upper dome and the lower dome have different directions of extension.

In an alternative embodiment, the upper dome has an oblique angle to the horizontal plane; the lower dome has an oblique angle with the horizontal plane.

In an alternative embodiment, the cage body is provided with a central bore that extends through both the upper and lower domes.

In an alternative embodiment, the central bore has an inner diameter that is 2/5-3/5 of the front-to-rear distance of the cage body.

In an alternative embodiment, a biologically active layer is provided on the upper dome.

In an alternative embodiment, the distance between the upper dome and the lower dome increases gradually from the front end to the rear end of the cage body.

In an alternative embodiment, the rear end of the cage body is provided with a connection portion for connection with an operating instrument.

In an alternative embodiment, the connecting portion is provided with a threaded hole for connection with an operating instrument.

In an alternative embodiment, the connecting portion is provided with a latching groove for connection to an operating device.

The embodiment of the utility model provides a beneficial effect is:

in conclusion, the embodiment provides a dome-shaped bionic cervical vertebra interbody fusion cage, which comprises a fusion cage body, wherein the fusion cage body is provided with an upper dome surface and a lower dome surface which are opposite to each other, and after the fusion cage body is implanted into cervical vertebra interbody, the upper dome surface and the lower dome surface are respectively contacted with the upper surface and the lower surface of a human body, which form a taper gap. The upper surface and the lower surface of the fusion cage body are both in a dome shape and are consistent with the dome shape of the intervertebral space, and after the fusion cage is implanted, the fusion cage is tightly combined with the upper surface and the lower surface of the intervertebral space, so that the surgical risks of fusion cage sinking and bone healing failure are reduced or even avoided. And through setting up the arch, increase stability, difficult aversion is not hard up.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a dome-shaped bionic cervical interbody fusion cage according to an embodiment of the present invention;

fig. 2 is a schematic view of arrangement of the protrusions according to the embodiment of the present invention;

fig. 3 is a schematic view of a partial microstructure of the fusion cage body and the bioactive layer according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a fusion cage body according to an embodiment of the present invention.

Icon:

001-dome-shaped bionic cervical interbody fusion cage; 100-a cage body; 110-upper dome; 120-lower dome; 130-a bump; 140-mesopores; 150-a connecting portion; 151-threaded hole; 152-card slot; 160-intermediate connecting surface; 200-bioactive layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

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, it need not be further defined and explained in subsequent figures.

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 the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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.

Referring to fig. 1, the embodiment provides a dome-shaped bionic cervical interbody fusion cage 001, which has a good fixing effect on a patient after being placed in the patient, and is in full contact with cancellous bone in the patient vertebral body and the surface of the fusion cage, so as to facilitate bone fusion.

Referring to fig. 1 and 2, in the present embodiment, the dome-shaped bionic cervical interbody fusion cage 001 includes a cage body 100, the cage body 100 has an upper dome 110 and a lower dome 120 opposite to each other, the upper dome 110 is consistent with the dome of the upper surface of the intervertebral space, and the lower dome 120 is consistent with the dome of the lower surface of the intervertebral space; a plurality of protrusions 130 are provided on the upper dome 110 and the lower dome 120, respectively.

Optionally, at least two of the plurality of embossments located on at least one of the upper dome and the lower dome have different directions of extension. For example, at least two of the plurality of lobes on the upper dome have different lobe extensions and at least two of the plurality of lobes on the lower dome have different lobe extensions; alternatively, the plurality of bulges on the upper dome have the same extending direction, and at least two bulges among the plurality of bulges on the lower dome have different extending directions.

According to the dome-shaped bionic cervical intervertebral fusion cage 001 provided by the embodiment, after the fusion cage body 100 is implanted into cervical intervertebral, the upper dome 110 and the lower dome 120 are respectively attached to the upper surface and the lower surface of a human body, which form a conical gap. Since the plurality of bulges 130 are arranged on at least one of the upper dome 110 and the lower dome 120, at least two bulges 130 in the plurality of bulges 130 on the same dome have different extending directions, namely, the angles between the at least two bulges 130 and the corresponding domes are different, and the directions of the at least two bulges 130 are different, so that the contact area between the bulges 130 and the human body is increased, the fusion cage body 100 is prevented from being displaced in different directions, and the fusion cage is fixed to the human body effectively. After the fusion cage is placed in a patient body, the bulge 130 can pass through the vertebral body end plate and sink into the vertebral body by applying force and pressurization, so that the three-dimensional fixing effect of the fusion cage body 100 is increased, and meanwhile, cancellous bones in the vertebral body are fully contacted with the surface of the fusion cage, and the bone fusion is facilitated.

In this embodiment, optionally, the cage body 100 further includes an intermediate connecting surface 160, the intermediate connecting surface 160 is located between the upper dome 110 and the lower dome 120, and two opposite annular edges of the intermediate connecting surface 160 are connected to the peripheral edge of the upper dome 110 and the peripheral edge of the lower dome 120, respectively.

Optionally, the intermediate connecting surface 160 is an arcuate surface. That is, the front of the fusion cage body is an arc-shaped surface, which is convenient for being placed into the body of a patient. The back of the fusion cage body is an operation surface.

Further, the middle connection surface 160 has a front side corresponding to the front end of the fusion cage body 100 and a rear side corresponding to the rear end of the fusion cage body 100, and the radian of the front side is smaller than that of the rear side, that is, the middle connection surface 160 is substantially in a shape that the front side is smaller and the rear side is larger, so that the fusion cage body 100 can be conveniently placed in the patient.

It should be noted that the middle connection surface 160 may not be an arc surface, and this embodiment is not illustrated.

In this embodiment, the upper dome 110 is optionally a dome-shaped dome that is convex upward, corresponding to the dome of the upper surface of the intervertebral space, and the dome height varies from individual to individual according to different segments of the cervical spine, each 0.5mm in size. The upper dome 110 has an oblique angle α with the horizontal plane, which is an acute angle matching the physiological shape of the cervical intervertebral space that is wide in the anterior and narrow in the posterior. The dome height a of the upper dome 110 is set as required, and can be matched with different segments of the cervical vertebrae of the human body.

Further, the upper dome 110 is elliptical, and the left-right diameter is larger than the front-back diameter, so that the contact area between the fusion cage body 100 and the surfaces of the upper and lower vertebral bodies is increased, the risk of sinking is avoided, and the risk of pressing the spinal nerves backwards is reduced.

In this embodiment, the lower dome 120 is optionally a downward convex dome-shaped dome, which is consistent with the dome of the lower surface of the intervertebral space, and the dome height is different according to different cervical vertebrae segments and different individuals, and is of a specification of 0.5mm each time. The lower dome 120 has an acute angle beta with the horizontal plane that matches the physiological shape of the cervical intervertebral space that is wide in the anterior and narrow in the posterior.

So designed, the distance between the upper dome 110 and the lower dome 120 gradually increases from the front end to the rear end of the cage body 100, facilitating the placement of the cage body 100 into the patient.

Obviously, in other embodiments, the fact that one of the upper dome 110 and the lower dome 120 is beveled with respect to the horizontal plane also makes it possible to achieve a gradual increase in the distance between the upper dome 110 and the lower dome 120 from the front end to the rear end of the cage body 100, i.e., a trapezoidal shape with a narrow front and a wide rear in a sectional view of the front-rear middle axis of the cage body 100.

In addition, since the middle connecting surface 160 is small in the front and large in the back, the upper dome 110 and the lower dome 120 connected with the middle connecting surface 160 are both in the shape of small in the front and large in the back, so that the contact area of the fusion cage body 100 with the surfaces of the upper and lower vertebral bodies is increased, the risk of sinking is avoided, and the risk of the fusion cage body 100 pressing the spinal nerves backwards is reduced.

Referring to fig. 3, in this embodiment, optionally, the dome-shaped bionic cervical interbody fusion cage 001 further includes a bioactive layer 200, the bioactive layer 200 may be a nano-hydroxyapatite and an anti-inflammatory metal ion layer, and the bioactive layer 200 is disposed on at least one of the upper dome 110 and the lower dome 120 in a coating manner. For example, in this embodiment, the bioactive layer 200 is on both the upper dome 110 and the lower dome 120. By providing the bioactive layer 200, the fusion cage body 100 has the double biological effects of osteogenesis and anti-inflammation, which is more conducive to bone healing and reduces the risk of loosening and displacement of the fusion cage.

In this embodiment, optionally, the upper dome 110 and the lower dome 120 are provided with protrusions 130 extending in different directions. For ease of design, the embossments 130 on the upper dome 110 may be shaped and arranged to conform to the embossments 130 on the lower dome 120. In the present embodiment, for convenience of description, the bulge 130 on the dome 110 is described as an example.

Referring to fig. 2, a row of bumps is shown in a dashed box. Optionally, the bulges 130 on the upper dome 110 are arranged in a plurality of rows, each row comprises a plurality of bulges 130, and the plurality of bulges 130 in the same row extend in the same direction; the projections 130 of adjacent columns extend in opposite directions.

Alternatively, the plurality of rows of projections 130 are arranged at intervals in the front-rear direction of the cage body 100. The front side of the row of projections 130 near the front end of the fusion cage body 100 is provided with an arc-shaped surface, which facilitates the placement of the fusion cage body 100 into the patient.

It should be noted that the arrangement of the embossments 130 on the upper dome 110 and the arrangement of the embossments 130 on the lower dome 120 may be different. Further, all of the embossments 130 on the upper dome 110 may extend in different directions, and the embossments 130 on the lower dome 120 may all extend in the same direction. Alternatively, all of the embossments 130 on the upper dome 110 may extend in the same direction, and all of the embossments 130 on the lower dome 120 may extend in different directions. In this embodiment, one example is not given.

In addition, the arrangement of the plurality of protrusions 130 on the same dome surface is not illustrated.

Alternatively, the projections may be semi-circular grain structures.

In this embodiment, optionally, the fusion cage body 100 is provided with a middle hole 140, the middle hole 140 penetrates through both the upper dome 110 and the lower dome 120, and the middle hole 140 is located at a position substantially in the middle of the fusion cage body 100. In other words, the middle hole 140 extends in the thickness direction of the cage body 100, and one end port of the middle hole 140 is located on the upper dome 110 and the other end port is located on the lower dome 120.

Further, the mesopores 140 can be cylindrical pores. The central bore 140 has an inner diameter 2/5-3/5 of the front-to-rear distance of the cage body 100. For example, the inner diameter of the central bore 140 is 2/5, 1/2, or 3/5 of the front-to-rear distance of the cage body 100. Obviously, the inner diameter of the central bore 140 may also be any other value between 2/5-3/5 of the front-to-rear distance of the cage body 100.

By providing the central hole 140, autologous bone particles can be implanted in the central hole 140 during surgery to promote bone healing. And because the inner diameter of the middle hole 140 is 2/5-3/5 of the distance from the front end to the rear end of the fusion cage body 100, the middle hole 140 has a moderate size, local autogenous bones can be better filled, and the operation risk of taking bones from other parts is reduced.

Referring to fig. 1 and 4, in the present embodiment, optionally, a connecting portion 150 for connecting with an operating instrument is provided at the rear end of the fusion cage body 100. When the fusion cage implanting operation is performed, the operation instrument is connected to the connecting portion 150, and the fusion cage body 100 is conveniently implanted into the patient body through the operation instrument.

It is apparent that the manipulation instrument is detachably coupled to the coupling part 150, and the manipulation instrument is easily separated from the fusion cage body 100 after the fusion cage body 100 is placed in the patient.

Optionally, the connecting portion 150 includes a threaded hole 151 and a locking groove 152 disposed at the rear end of the fusion cage body 100, and the depth of the threaded hole 151 may be set as required. During the use, with operation apparatus and screw hole 151 spiro union and with draw-in groove 152 joint cooperation, the operation is accomplished the back, unclamp with the joint of draw-in groove 152, then the contrarotation operation apparatus, make it break away from screw hole 151.

The dome-shaped bionic cervical spine interbody fusion cage 001 provided by the embodiment has at least the following advantages:

firstly, a dome-shaped design is adopted, namely the upper surface and the lower surface of the fusion cage body 100 are both dome-shaped and are consistent with the dome-shaped of the intervertebral space, and after the fusion cage body 100 is implanted, the upper surface and the lower surface of the intervertebral space are tightly combined, so that the surgical risks of fusion cage sinking and bone healing failure are reduced or even avoided;

secondly, the upper dome 110 and the lower dome 120 adopt different directions of bulges 130, which not only helps the fusion cage to be in close contact with the upper and lower surfaces of the intervertebral disc, but also helps to reduce the risk that the fusion cage is withdrawn forwards after being implanted and enters the vertebral canal backwards to press the spinal cord;

thirdly, nano hydroxyapatite and a metal coating are grafted on the upper dome 110 of the fusion cage body 100, the interior of the fusion cage body 100 is designed to be a porous structure, and the fusion cage body 100 has a supporting function and biological activity, so that the bone healing is facilitated, and the risk of fusion operation failure is avoided;

fourthly, a small amount of autogenous bones are implanted into the hollow middle hole 140 of the fusion device body 100 to further promote bone healing, the required bone mass is small, the autogenous bones cut by the local operation can meet the requirements, the complication of the additional bone-taking operation or the risk of the immunological reaction of the allogeneic bones is avoided, the operation time is saved, the operation wound is reduced, and the medical expense is saved.

In the fusion cage provided by the embodiment, the upper dome 110 is in contact with the upper surface of the intervertebral space, the lower dome 120 is in contact with the lower surface of the intervertebral space, the body part is arranged between the upper dome and the lower dome, the upper dome and the lower dome can be continuous PEEK material matrixes, the front surface of the fusion cage body 100 is in a smooth arc shape, and when the fusion cage body is placed in a patient body, the fusion cage body firstly enters the intervertebral space and then enters the posterior part of the intervertebral space to be adjacent to a vertebral. The rear of the fusion cage body 100 is an operation surface which is connected with an operation instrument through a threaded hole and a clamping groove in an operation so as to be conveniently placed in an intervertebral space; the center of the fusion device body is a middle hole which is an upper middle hole and a lower middle hole and is used for implanting autologous bone particles.

It should be noted that the fusion cage body 100 may be formed by 3D printing of PEEK composite material, and in other embodiments, the personalized fusion cage may be modeled and printed by the imaging data of the patient.

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 (9)

1. A dome-shaped bionic cervical vertebra interbody fusion cage is characterized by comprising:

a cage body having opposing upper and lower domes, the upper dome conforming to the dome of the upper surface of the intervertebral space and the lower dome conforming to the dome of the lower surface of the intervertebral space; a plurality of bulges are respectively arranged on the upper dome and the lower dome; the distance between the upper dome and the lower dome is gradually increased from the front end to the rear end of the cage body.

2. The dome-shaped bionic cervical interbody fusion cage of claim 1, wherein:

at least two of the plurality of embossments on at least one of the upper dome and the lower dome have different directions of extension.

3. The dome-shaped bionic cervical interbody fusion cage of claim 1, wherein:

the upper dome has an oblique angle with the horizontal plane; the lower dome has an oblique angle to the horizontal.

4. The dome-shaped bionic cervical interbody fusion cage of claim 1, wherein:

and a middle hole which simultaneously penetrates through the upper dome and the lower dome is formed in the fusion cage body.

5. The dome-shaped bionic cervical interbody fusion cage of claim 4, wherein:

the inner diameter of the central hole is 2/5-3/5 of the front end to rear end distance of the cage body.

6. The dome-shaped bionic cervical interbody fusion cage of claim 1, wherein:

a bioactive layer is disposed on at least one of the upper dome and the lower dome.

7. The dome-shaped bionic cervical interbody fusion cage of claim 1, wherein:

the rear end of the fusion cage body is provided with a connecting part used for being connected with an operating instrument.

8. The dome-shaped bionic cervical interbody fusion cage of claim 7, wherein:

the connecting portion is provided with a threaded hole for connecting with the operating instrument.

9. The dome-shaped bionic cervical interbody fusion cage of claim 7, wherein:

the connecting part is provided with a clamping groove used for being connected with the operating instrument.

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