CN111631844B - A Double Cortical Elastic Fixation Fusion Device - Google Patents

Abstract

The invention relates to a double-cortical elastic fixation fusion cage, which belongs to the technical field of medical instruments and comprises a bone grafting supporting part and an elastic supporting fixing part for supporting in the front part of a vertebral gap, wherein a bone grafting cavity is arranged on the bone grafting supporting part, the elastic supporting fixing part and the bone grafting supporting part are connected together, and a fixing structure which is sequentially fixed on cortical bone, cancellous bone and lateral cortical bone of a vertebral end plate in a penetrating way is arranged on the elastic supporting fixing part. Adopt this structure, the elastic support fixed part can produce micro-elastic deformation, low head at the patient, the in-process of raising the head or turning round the head, the elastic support fixed part can reduce stress concentration and stress through elastic deformation and shelter from, thereby it is not hard up to reduce postoperative fixed knot structure, withdraw from, the probability that phenomena such as bone absorption take place, fixed knot constructs in proper order the cross-under and fixes at vertebra end plate cortex of bone, cancellous bone and side cortex of bone, play better fixed effect, thereby be favorable to bone grafting material to grow in the intervertebral space.

Description

A Double Cortical Elastic Fixation Fusion Device

technical field

The invention belongs to the technical field of medical devices, and in particular relates to a double-cortical elastic fixation fusion device.

Background technique

The human vertebral bone is composed of the outer layer of cortical bone and the inner layer of cancellous bone. The cancellous bone is spongy and is composed of interwoven bone trabeculae, which are distributed inside the vertebral body, the surface of the vertebral body and the end plate. Made of hard and strong cortical bone. It has been reported in the literature that bone density is one of the important factors affecting the screw fixation strength. When the screw parameters are consistent, the bone density of the vertebral body increases and the screw fixation strength increases; the strength and density of cortical bone are higher than that of cancellous bone, so cortical bone is used Bone screw fixation technique can increase the strength of screw fixation and reduce the risk of screw withdrawal.

In the current cervical spine surgery technology, in order to enhance the strength of screw fixation, the following two screw fixation techniques can be used: one is cervical anterior retrograde pedicle screw fixation (the cortical bone at the pedicle is thicker), and the other is screw fixation from the front of the vertebral body. The cortex penetrates posteriorly through the posterior wall of the vertebral body to achieve bicortical fixation. However, there are many inconveniences in the use of fusion cages produced based on the above-mentioned technologies. The screws pass through the screw holes of the front miniature titanium plate and then pass through the endplate into the cancellous bone of the vertebral body. The fixation strength is limited, and the front titanium plate is a whole. The elastic modulus is large, the stress shielding and stress concentration phenomena are more obvious, and the risk of postoperative screw loosening, withdrawal, and bone resorption is higher.

Contents of the invention

The invention provides a double-cortex elastic fixed fusion device, which is used to solve the technical problem of many inconveniences in the use process of the fusion device in the prior art.

The present invention is achieved through the following technical solutions: a double-cortical elastic fixation fusion device, comprising a bone graft support part and an elastic support fixation part for supporting in the front part of the intervertebral space, the bone graft support part is provided with a The bone graft cavity of the bone graft material, the elastic support and fixation part and the bone graft support part are connected together, the elastic support and fixation part is installed with a bone that is sequentially penetrated and fixed on the vertebral endplate bone cortex, cancellous bone and side bone Fixed structure of square bone cortex.

Further, in order to better realize the present invention, the elastic support and fixing part includes flexible fillers and spliced front side panels, rear side panels, upper side panels, lower side panels, left side panels and right side panels. A hollow shell, the flexible filler is filled inside the hollow shell, the thickness of the upper side plate and the lower side plate are both A, the front side plate, the rear side plate, the The thicknesses of the left side plate and the right side plate are both B, where A>B.

Further, in order to better realize the present invention, the front side plate, the rear side plate, the left side plate, the right side plate, the upper side plate and the lower side plate are all titanium plates, so The thickness of the upper side plate and the lower side plate is 1mm, the thickness of the front side plate, the rear side plate, the left side plate and the right side plate is B, 0.3mm≤B≤ 0.5mm.

Further, in order to better realize the present invention, the flexible filler is a spring, and the two ends of the spring abut against the upper side plate and the lower side plate respectively.

Further, in order to better realize the present invention, the flexible filler is an elastic piece, and the two ends of the elastic piece abut against the upper side plate and the lower side plate respectively.

Further, in order to better realize the present invention, the cavity wall of the bone graft cavity is provided with several through holes.

Further, in order to better realize the present invention, the upper surface of the upper side plate and/or the lower surface of the lower side plate and/or the upper and lower surfaces of the bone graft supporting part are provided with protrusions for anti-slip .

Further, in order to better realize the present invention, the fixing structure includes a first hole, a first locking part, a second hole and a second locking part, the first hole faces upwards rearward and slopes sideways and The first hole runs through the front side plate and the upper side plate, the second hole faces rearward and downward and slopes sideways and the second hole runs through the front side plate and the lower side plate, the The first locking part is connected in the first hole, and the first locking part successively passes through and fixes the endplate cortex, cancellous bone and lateral cortex of a vertebra on the upper side of the intervertebral space, so that The second locking part is connected in the second hole, and the second locking part sequentially pierces and fixes the endplate cortex, cancellous bone and lateral cortex of a vertebra below the intervertebral space.

Further, in order to better realize the present invention, the number of the fixing structures is two groups, and the fixing structures of the two groups are arranged symmetrically.

Further, in order to better realize the present invention, both the first locking part and the second locking part are screws.

Compared with the prior art, the present invention has the following beneficial effects:

The bicortical elastic fixation fusion device provided by the present invention includes a bone graft support part and an elastic support fixation part for supporting in the front part of the intervertebral space. The bone graft support part is provided with a bone graft cavity for filling bone graft material, and the elastic support The fixation part and the bone graft support part are connected together, and a fixation structure is installed on the above-mentioned elastic support fixation part, and the fixation structure can be pierced on the endplate cortex, cancellous bone and lateral cortex of the vertebra in sequence. With this structure, compared with the hard titanium plate in the prior art, the above-mentioned elastic support and fixing part can produce a small amount of elastic deformation. When the user lowers his head, raises his head or turns his head, the elastic support and fixing part can deformation to reduce stress concentration and stress shielding, thereby reducing the chances of postoperative fixation structure loosening, withdrawal, bone resorption, and non-fusion of bone grafts, and the fixation structure set on the elastic support fixation part can be threaded and fixed in turn It has a better fixation effect on the vertebral endplate cortex, cancellous bone and lateral cortex, especially for elderly patients with osteoporosis, and reduces the probability of the entire fusion cage loosening in the intervertebral space, thereby effectively Facilitate the growth of bone graft material in the intervertebral space.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a top view structural schematic diagram of a bicortical elastic fixation fusion device in an embodiment of the present invention;

Fig. 2 is a front view structural schematic diagram of the structure shown in Fig. 1;

Fig. 3 is a left view structural schematic diagram of the structure shown in Fig. 1;

Fig. 4 is a schematic structural view of the first locking part and the second locking part connected to the elastic support fixing part in the embodiment of the present invention;

Fig. 5 is a cross-sectional view of the elastic support fixing part in the embodiment of the present invention.

In the picture:

1-bone graft support part; 11-bone graft cavity;

2-elastic support and fixing part; 21-hollow shell; 22-flexible filler;

3- the first locking part;

4-Second locking part;

5 - pores;

6-Convex.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

Example 1:

This embodiment provides a double-cortical elastic fixation fusion device, which is used for implanting into the intervertebral space of a patient's cervical spine from an anterior approach for bone grafting.

The double cortex elastic fixation fusion device includes a bone graft support part 1 and an elastic support fixation part 2, the bone graft support part 1 and the elastic support fixation part 2 are connected together, specifically, the bone graft support part 1 and the elastic support fixation part 2 It can be connected by a buckle or a spherical hinge joint. This connection method is the same as the connection method between the front part and the rear part of the fusion cage in the prior art, so it will not be described in detail here. When the bone graft support part 1 After being connected with the elastic support fixing part 2, the two can produce slight relative rotation.

When the double-cortical fusion device provided by this embodiment is implanted into the cervical intervertebral space from an anterior approach, the bone graft support part 1 and the elastic support and fixation part 2 are inserted into the intervertebral space, and the elastic support and fixation part 2 is supported at the front of the intervertebral space The bone graft support part 1 is supported at the back of the intervertebral space, that is, both the bone graft support part 1 and the elastic support fixing part 2 can be supported in the intervertebral space, and the tops of both are connected to a vertebra on the upper side of the intervertebral space. The bottom ends of both connect to a vertebra just below the intervertebral space to form a support. A bone graft cavity 11 is provided on the bone graft support part 1, and the bone graft cavity 11 is used for filling bone graft material. When the above-mentioned bone graft support part 1 is located at the predetermined position in the rear part of the intervertebral space, the bone graft contained therein can grow.

A fixing structure is also installed on the above-mentioned elastic support fixing part 2, and the fixing structure can be penetrated and fixed on the endplate cortex, cancellous bone, and side cortex of the vertebrae in sequence, so that the fixation is more stable and avoids the elasticity of the entire double cortex. The fixed cage is loose or falls off. And above-mentioned elastic support fixing part 2 can also produce micro-deformation when forming support, when the patient raises the head or bows the head or turns the head, the upper and lower two vertebrae of the intervertebral space squeeze the elastic support fixing part 2, and the elastic support fixing part 2 is squeezed Compression can produce a small amount of elastic deformation to reduce stress concentration and stress shielding, which can reduce the probability of loosening, withdrawal and bone resorption of the fixed structure, which is more conducive to the growth of bone graft materials in the intervertebral space.

As a more optimal implementation of this embodiment, in this embodiment, several through pores 5 are provided on the cavity wall of the above-mentioned bone graft cavity 11, and through these pores 5, the nutrients in the intervertebral space are conveniently It can flow into the bone graft cavity 11 to promote the growth of the bone graft material.

Example 2:

This embodiment serves as a specific implementation of Embodiment 1. In this embodiment, the above-mentioned elastic support and fixing part 2 includes a flexible filler 22 and a hollow shell 21. The hollow shell 21 is composed of an upper side plate, a lower side board, front side board, rear side board, left side board and right side board, the above-mentioned flexible filler 22 is filled inside the above-mentioned hollow shell 21, and limits the thickness of the above-mentioned upper side board and lower side board All are A, and the thicknesses of the above-mentioned front side board, rear side board, left side board and right side board are all B, and A>B.

With this structure, the above-mentioned upper side plate and the lower side plate are plates that cannot produce deformation, and the above-mentioned front side plate, rear side plate, left side plate, and right side plate can all produce a small amount of elastic deformation. 2 When receiving the first acting force from the up and down direction, with the help of the deformation ability of the front side plate, rear side plate, left side plate and right side plate and the flexibility of the above-mentioned flexible filler 22, the gap between the upper side plate and the lower side plate The distance can produce a small amount of elastic changes. When the first force disappears, the distance between the upper side plate and the lower side plate is within the distance between the front side plate, the rear side plate, the left side plate, the right side plate and the flexible filler 22. Return to the initial state under elastic action; when the elastic support fixing part 2 is subjected to the second force from the side, by means of the deformation ability of the front side plate, the rear side plate, the left side plate and the right side plate, the front side plate, the rear side plate, the left side plate and the right side plate The side plate group composed of the rear side plate, the left side plate and the right side plate can produce a small amount of lateral displacement or twist, and when the second force disappears, the original state will be reset. Through this structure, the pressure concentration and pressure shielding phenomenon in the elastic support and fixing part 2 can be well eliminated, thereby ensuring that the bone graft support part 1 can be placed at a predetermined position better and more accurately, thereby obtaining a better bone graft Effect.

As a best implementation mode of this embodiment, the upper side plate, lower side plate, front side plate, rear side plate, left side plate and right side plate in this embodiment are all titanium plates, and the upper side plate and The thickness of the lower side plate is 1mm. In this way, the thickness of the upper side plate and the lower side plate is sufficient to cause almost no deformation. The thickness of the front side plate, the rear side plate, the left side plate and the right side plate are the same and are all defined as B , 0.3mm≤B≤0.5mm, in this way, the front side plate, the rear side plate, the left side plate and the right side plate can produce a small amount of elastic deformation. Specifically, the above-mentioned side plates and lower side plates are made of ordinary titanium plates, and the materials of the above-mentioned front side plates, rear side plates, left side plates and right side plates are elastic titanium plates.

As a better implementation of this embodiment, the upper surface of the upper side plate and/or the lower surface of the lower side plate and/or the upper and lower surfaces of the bone graft support in this embodiment are all provided with convex parts 6, by means of which The convex part 6 can increase the frictional force between the elastic support fixing part 2 and the side wall of the intervertebral space, so that the elastic support and fixing part 2 can be more firmly installed in the intervertebral space.

Example 3:

This embodiment is a specific implementation of the above-mentioned embodiment. In this embodiment, the above-mentioned flexible filler 22 is a spring, and the two ends of the spring abut against the upper side plate and the lower side plate respectively, and the spring is in a compressed state.

As another implementation of this embodiment, in this embodiment, the above-mentioned flexible filler 22 is an elastic piece, and the two ends of the elastic piece are in contact with the above-mentioned upper side plate and the lower side plate respectively, and the spring is in a compressed state.

Example 4:

This embodiment serves as a best implementation mode of the above-mentioned embodiment. In this embodiment, the above-mentioned fixing structure includes a first hole, a first locking portion 3 , a second hole and a second locking portion 4 . Wherein, the above-mentioned first hole runs through the above-mentioned front side plate and the upper side plate, and the first hole faces upward and backward and slopes toward the side, and the above-mentioned first locking part 3 passes through the first hole and passes through the first hole After the holes are guided, they are sequentially penetrated and fixed in the endplate cortex, cancellous bone and lateral cortex of a vertebra on the upper side of the intervertebral space. The second hole runs through the front side plate and the lower side plate, and the second hole is facing downwards and inclined to the side, and the second locking part 4 is passed through the second hole and guided through the second hole Then it is penetrated and fixed in sequence in the endplate cortex, cancellous bone and lateral cortex of a vertebra on the lower side of the intervertebral space.

With the above-mentioned structure, both the first locking part 3 and the second locking part 4 are connected and fixed on the double cortex (that is, the endplate cortex and the side cortex), so that the fixation is more stable, and the first locking Both part 3 and second locking part 4 can be installed from the front side plate, so the installation is simpler and more convenient, and the spinal cord and spinal nerves will not be damaged during the fixing process of the first locking part and the second locking part As well as the vertebral artery, the risk of surgery is lower, so it is more practical.

As a better implementation of this embodiment, the number of fixing structures in this embodiment is two groups, and the two fixing structures are symmetrically arranged to further reduce the phenomenon of stress concentration inside the elastic support fixing part 2, and can Make the fixing more firm.

As a best implementation mode of this embodiment, the first locking part 3 and the second locking part 4 in this embodiment are both screws, and the above-mentioned first holes and second holes are both screw holes.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope of the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. A double-cortical elastic fixation fusion device is characterized in that: it comprises a bone graft support part and an elastic support fixation part for supporting in the front part of the intervertebral space, and the bone graft support part is provided with a bone graft material for filling The bone graft cavity, the elastic support and fixation part is connected with the bone graft support part, and the elastic support and fixation part is installed with a bone that is sequentially pierced and fixed on the vertebral endplate cortical bone, cancellous bone and lateral cortical bone. fixed structure; The elastic support and fixing part includes a flexible filler and a hollow shell spliced by a front side panel, a rear side panel, an upper side panel, a lower side panel, a left side panel and a right side panel, and the flexible filler fills Inside the hollow shell, the thickness of the upper side plate and the lower side plate is A, and the thickness of the front side plate, the rear side plate, the left side plate and the right side plate The thickness is B, A>B. 2. A kind of double cortex elastic fixation fusion device according to claim 1, characterized in that: the front side plate, the rear side plate, the left side plate, the right side plate, the upper side plate and The lower side plates are all titanium plates, the thickness of the upper side plate and the lower side plate is 1mm, the front side plate, the rear side plate, the left side plate and the right side plate The thickness is B, 0.3mm≤B≤0.5mm. 3. A double-cortical elastic fixation fusion device according to claim 2, characterized in that: the flexible filler is a spring, and the two ends of the spring respectively abut against the upper side plate and the lower side plate catch. 4. A double-cortical elastic fixation fusion device according to claim 2, characterized in that: the flexible filler is a shrapnel, and the two ends of the shrapnel respectively abut against the upper side plate and the lower side plate catch. 5. A double-cortical elastic fixation fusion device according to claim 1, characterized in that: the cavity wall of the bone graft cavity is provided with several through holes. 6. A double cortical elastic fixation fusion device according to claim 1, characterized in that: the upper surface of the upper side plate and/or the lower surface of the lower side plate and/or the bone graft support portion The upper and lower surfaces are provided with protrusions for anti-slip. 7. A bicortical elastic fixation fusion device according to any one of claims 1-6, wherein the fixation structure includes a first hole, a first locking part, a second hole and a second lock In the tight part, the first hole faces upward and backward and slopes sideways, and the first hole passes through the front side plate and the upper side plate, and the second hole faces backward and downward, slopes sideways and the first hole Two holes pass through the front side plate and the lower side plate, the first locking part is connected in the first hole and the first locking part is sequentially penetrated and fixed on a piece on the upper side of the intervertebral space Vertebral endplate cortex, cancellous bone and lateral cortex, the second locking part is connected in the second hole and the second locking part is sequentially pierced and fixed in a piece below the intervertebral space Vertebral endplate cortex, cancellous bone, and lateral cortex. 8. A bicortical elastic fixation fusion device according to claim 7, characterized in that: the number of said fixation structures is two groups, and said two groups of said fixation structures are arranged symmetrically. 9 . The double cortex elastic fixation fusion device according to claim 7 , wherein both the first locking part and the second locking part are screws.

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