KR101939213B1 - Spinal posterior metallic mesh - Google Patents

Abstract

The present invention relates to a new posterior spinal nerve structure capable of improving stability through bony union and spinal nerve protection even after sufficient decompression in posterior spinal fusion after posterior decompression. It is possible to easily provide a bone bed foundation for sufficient bone graft removal after bone removal, and it is easy to fix using a mesh (mesh plate) shaped cutting screw and a fixing screw, so that highly effective spinal fusion and reconstruction is possible. There is also the ability to protect the posterior spinal nerve.

Description

{Spinal posterior metallic mesh}

The present invention relates to a new structure that can be used for effective spinal fusion and reconstruction in posterior spinal fusion after posterior decompression.

If a spinal injury or injury is caused by a surgical spine surgery, the spine will be treated. Decompression and stability are important factors in successful spinal surgery.

In order to relieve neurological symptoms, it is necessary to decompress the area where the nerve is compressed, but the stability of the vertebrae decreases when the back bone is removed much to reduce the pressure.

As the stability decreases, secondary problems due to instability of the spine lead to a higher probability of reoperation, so posterior spinal fixation using various devices is performed to improve stability. However, posterior fixation of the spine can guarantee temporal stability, but the fixation force can not be maintained for a lifetime, and loosening or dissociation with time may occur, . In other words, unless the vertebrae, which are normally separated from each other, are connected to one of the bone tissues through spinal fusion, the separated vertebrae can not be maintained only by metal fixation for a lifetime. This is because there is a relaxation or dissociation between the metal screw and the bone tissue that fixes the separated vertebrae.

Korean Patent Laid-Open No. 2009-0024121 discloses a reinforcement device for reinforcing a spinal column weakened by surgery, but discloses only a device used for anterior spinal fusion.

In most patients, posterior fusion is performed during spinal fusion.

Because fixation can not be maintained for a lifetime with the use of metal fixation and as time goes by, dissociation or relaxation due to micro-motion between the metal screw and the bone tissue occurs, so the metal fixation and the bone tissue separated above and below the spine Many authors have used posterior fusion of the vertebrae from the back of the vertebrae using autografts or allografts.

However, if posterior decompression is performed prior to posterior fusion, removal of the posterior bone tissue for adequate decompression may result in insufficient base for implantation of bone graft materials such as autogenous bone or allogeneic bone, Is high.

In addition, posterior decompression may cause compression and adhesion of the spinal nerve, which is protected by the posterior vertebra of the vertebrae, due to muscle and surrounding tissues after surgical site suture.

Therefore, a new method or device is needed for reinforcing the weakening of stability after removal of the posterior bony structure in posterior decompression of the spine, and for laying the foundation for neuroprotection and bone grafting.

Korean Patent Publication No. 2009-0024121

The present invention is based on the finding that, in the posterior lumbar interbody fusion after the posterior decompression of the vertebra, it is possible to solve the area shortage of the base on which the bone graft is removed by decompression, the stability of the vertebra, We want to provide a new structure.

The present invention provides a spinal posterior mesh that can be placed independently between the laminae of the spine in posterior spinal fusion after spinal decompression.

The back mesh of the present invention includes a mesh plate having a plurality of holes formed therein which is easy to be elastically deformed and cut, and a fixing screw to be inserted into a hole of the mesh plate. And the mesh plate is fixed by inserting a desired number of the desired number of the supraspinal and the lower synapses of the supraspinatus to provide stability.

The structure of the present invention can provide a sufficient base (bone bed) to place the bone graft in the posterior decompression of the vertebra after posterior decompression of the vertebrae, thereby providing additional stability to the existing fusion method and ensuring a successful bony union in a wider range. Spinal fusion and reconstruction are possible, and decompression can also protect the exposed spinal nerves.

Fig. 1 shows a top view of the spinal rear mesh of the present invention.
2 shows a side view of the spinal rear mesh of the present invention.
Figure 3 shows one of the resilient deformations of the backbone network of the present invention.
Fig. 4 shows a side view in which the back mesh of the present invention is fixed at the back of the vertebra.
FIG. 5 is a rear view of the spinal rear mesh of the present invention after being fixed from the back of the spine.
FIG. 6 shows a view of a mesh plate in which the size of the holes in the back mesh network of the present invention increases from the center to the outside.
FIG. 7 shows the vertebral aspect before the posterior decompression of the vertebra. In FIG. 7 (A), the rounded portion at the lower end of the vertebra is the vertebral body and the spinal nerve passes over the vertebral body. The bone above the vertebral nerve is the vertebral body, Stenosis, ligament ossification, etc.) are showing the pressured spinal nerve. (B) is a three-dimensional view of (A) from the side.
FIG. 8 shows a vertebral column in which a vertebral body (bone tissue) has been removed as needed for decompression of a lesion in a vertebral body decompression. (A) is a decompressed vertebral cross-section in which the vertebral body is removed, B) is a side view of the vertebral column from which the spinal column was removed.
FIG. 9 shows a state in which the posterior spinal mesh of the present invention is fixed and fixed by using a fixing screw, at a site where spinal hysteresis (bone tissue) is removed as much as necessary in the spinal fusion after spinal decompression, (B) is a three-dimensional view of the vertebra with the back mesh of the spine from the side.
Fig. 10 shows a state in which a bone graft material is placed on a mesh plate on the basis of a mesh plate of a back mesh network of a vertebra, (A) is a vertebra cross section on which a bone graft material is placed on a mesh plate, Three-dimensional view from the side.

Hereinafter, the present invention will be described in detail. The terms used in the present specification should be construed as generally understood by a person having ordinary skill in the art unless otherwise defined. It is to be understood that both the drawings and the examples are intended to illustrate and make the present invention readily understandable and obvious to those skilled in the art in light of the above teachings, It is not.

The present invention relates to a posterior spinal structure that can be used in posterior decompression posterior decompression surgery, and more particularly, to provide a base and bone bed for placing a bone graft material necessary for posterior fusion, Successful spinal fusion and reconstruction is possible. In addition, decompression can protect the spinal nerve from exposure and pressure and adhesion by surrounding tissues.

The present invention relates to a vertebra posterior mesh that can be independently positioned in the posterior spinal column in posterior spinal fusion after spinal decompression, comprising a mesh plate having a plurality of holes formed therein, The fixation screw may be removed at the time of spinal decompression and inserted into a desired position of the remaining upper spinal cord and lower spinal cord to fix the mesh plate.

The present invention relates to a vertebral back mesh for union of upper and lower vertebrae of a lesion removed from posterior decompression of the vertebrae, comprising an elastically deformable mesh plate having a plurality of holes formed therein and a setscrew inserted into the hole of the mesh plate, It is a posterior mesh of the vertebrae that can be inserted into the remaining vertebrae to fix the mesh plate during decompression.

The posterior spinal mesh of the present invention is a spinal posterior mesh that is independently positioned between a metal rod and a pedicle screw, which is a fixation device that fixes the upper and lower vertebrae in the spinal fusion after spinal decompression.

In spinal decompression, the spinal nerve is removed for decompression, so the vertebral nerve is exposed and the normal bone tissue is lost and instability of the spine occurs. In order to resolve the instability caused by spinal nerve exposure and normal bone loss, the vertebrae can be fixed with a spinal fixation metal screw and a metal rod on the upper and lower vertebrae of the spinal hysteresis removed from posterior decompression of the spine. However, metal fixation by spinal fixation metal screws and metal bars alone can not fix the spine permanently and it is difficult to protect the exposed spinal nerve. Therefore, posterior decompression of the spine requires posterior spinal fusion. In the posterior decompression of the vertebrae, removal of the bone tissue may not be successful due to the lack of foundation for the bone graft. This problem can be solved by installing the back mesh of the present invention at the position of the bone tissue (vertebral column) removed from the posterior decompression of the vertebra.

The back mesh network of the present invention has a body having a resilient and easily deformable mesh plate, a plurality of holes are formed in the body, and a fixing screw can be inserted into a plurality of holes. The fixation screw can be inserted into the upper and lower hindlimbs of the bone tissue (spinal hindlimb) removed by posterior decompression of the spine at a desired position as desired, and the mesh plate can be fixed immovably. The fixed mesh plate can serve as a basis for sufficiently loading the bone graft material required for fusion. In addition, since the mesh plate can be accurately fixed to the bone tissue (spinal hindlimb) removed from the spinal posterior fusion, successful bone union including the bone tissue removed from the fusion through the bone graft placed on the mesh plate is possible.

In this way, the mesh secured to the back of the vertebrae serves as the basis for placing the bone graft material necessary for vertebral fusion and protects the vertebral nerve exposed by the posterior decompression of the vertebrae to prevent spinal nerve compression and adhesion And the posterior stabilization of the tissues caused by posterior compression of the spine can be reinforced.

More specifically, the present invention will be described with reference to the drawings.

The back mesh net 1 of the present invention includes a mesh plate 11 capable of resilient deformation and a mesh plate securing screw 13 that can be inserted into the hole 12 of the mesh plate. The posterior spinal mesh of the present invention is made of a metal rod (14) secured to the upper and lower vertebrae for the stability of the spine after removal of the posterior bone tissue (lumbar plate or hindlimb, lamina) of the lesion site ) And the spinal fixation metal screw (15).

In the present invention, the mesh plate 11 serves as a basis for removing the lesion site in spinal decompression and placing the bone graft material for unification of the remaining normal vertebrae. Bone union can be achieved by forming a new bone tissue as long as the lesion site is removed by placing a bone graft material on the mesh plate (11). By bone union, the vertebrae that were cut off by the removal of the lesion can be continued and function as one bone.

The mesh of the present invention can be applied to the mesh plate 11 independently of the spinal fixation metal screw 15 and the metal rod 14, which are fixation devices for fixing the remaining vertebrae in the spinal fusion after spinal decompression, Similar to the size of the decompression site, it is cut during surgery, removed after decompression, and placed on the upper and lower spinal column of the remaining vertebra.

Then, holes of suitable positions are selected among the various holes 12 of the mesh plate which are in contact with the upper spinal column and the lower arcus via the mesh plate fixing screw 13, and are fixed by the desired number of screws.

Since the mesh of the present invention can be installed independently, the position of the mesh plate and the fixing screw can be freely selected, and the thickness of the plate is very thin, about 0.10 to 0.15 mm, so that the plate can be easily elastically deformed (bent) It can be easily cut into shape. Therefore, the formation of a bone bed foundation can be easily adjusted to the shape of the posterior bone tissue to be removed from the decompression. The bone graft material can be placed on the mesh plate as much as necessary for bone union on the basis of the mesh plate. In addition, it covers the posterior spinal nerve, so it can prevent and protect the nerve from adhesion.

As a result, stability is ensured and sufficient bone graft material can be used. Therefore, posterior decompression after spinal decompression is superior to spinal fusion and reconstruction.

In the back mesh network 1 of the present invention, the fixing screw holes of the mesh plate 11 are not defined, and all of the holes 12 existing in the mesh plate can be holes of the fixing screw, It is very convenient.

Titanium is one of the tools and devices used for bone fixation, such as orthopedic surgery and spinal surgery. Titanium has biocompatibility and does not cause corrosion in vivo. (high strength).

Since the mesh plate in the back mesh of the present invention is basically made of titanium and is very thin (0.10-0.15 mm) with the advantages of titanium material, it is possible to easily deform the shape of the tail or the shape, Can be brought into close contact with each other. In addition, the shape of the bone tissue removed during the posterior decompression surgery of the vertebrae can be freely formed and used without any restriction. It is also possible to use as many fixing screws as desired in a desired position through a number of fixing screw holes in the plate.

As the material of the mesh plate of the present invention other than titanium, a non-degradable material having a certain degree of rigidity and excellent biocompatibility is preferable. For example, there may be mentioned polyolefins such as polymethyl methacrylate, polyurethane, polyamides, polytetrafluoroethylene, polydimethyl siloxane, silicone, polysulfone, a group of materials such as polysulfone, polyacetal, polycarbonate, polypropylene, stainless steel, alumina, hydroxyapatite and zirxonia, And can be manufactured by selecting it when finding a more suitable material.

In the present invention, when a polymer is used in the production of a mesh plate, the elasticity can be controlled by using a high molecular weight polymer or by adding a plasticizer according to the kind of the polymer. The plasticizer is not particularly limited, and a known plasticizer may be suitably used depending on the type of the polymer.

In the present invention, the size of the hole of the mesh plate is not limited. However, the size of the hole of the mesh plate is not limited, but may be 1 mm to 5 mm, 1 mm to 4 mm, 1 mm to 3 mm, 1 mm to 2 mm, 2 mm to 5 mm, 2 mm to 4 mm, 2 mm to 3 mm, 3 mm to 5 mm, 2 mm to 3 mm, preferably 3 mm to 4 mm, but is not limited thereto. The shape of the hole is preferably circular, but not limited thereto, to facilitate insertion of the fastening screw. If the size of the hole is large, the bone graft placed on the mesh plate can enter the inside of the spinal nerve through the hole, which can damage the nerve or lead to poor spinal fusion and reconstruction. Also, if the hole size is too small, the cutting or shape deformation becomes more difficult, and the fixing screw size (diameter) is too small, and the fixing force may be weakened.

Hole having a predetermined size may be formed at regular intervals on the mesh plate or may be formed by adjusting the size of the hole so as to be increased from the center of the mesh plate to the outside.

The size of the hole is adjusted so as to become larger toward the outer side from the center of the mesh plate so that the bone graft material placed on the mesh plate can be more effectively prevented from passing through the hole to be directed to the nerve. However, it is not preferable to adjust the size of the hole so that the size of the hole continues to increase toward the outside, and it is preferable to adjust the maximum size of the hole with reference to the fixing screw. In addition, when the bone graft material is not formed in a part of the mesh plate in order to completely prevent the bone graft from passing through the hole, elastic deformation may be difficult. In the mesh plate, it is preferable that holes are formed at regular intervals according to the size of the holes. For example, as shown in FIG. 6, the hole may have a small size at the center, and the hole may be enlarged toward the outside. In this case, considering the insertion of the fixing screw, a uniform hole It is good to do.

In the present invention, the thickness of the mesh plate may vary depending on the material used, but may be 0.05 mm to 0.25 mm, 0.05 mm to 0.20 mm, 0.05 mm to 0.15 mm, 0.05 mm to 0.10 mm, 0.10 mm to 0.30 mm, mm, 0.10 mm to 0.20 mm, 0.15 mm to 0.30 mm, 0.15 mm to 0.25 mm, 0.15 mm to 0.20 mm, preferably 0.10 mm to 0.15 mm. As the thickness of the mesh plate becomes thicker, it is difficult to deform, cut and install. When the mesh plate is too thin, it is easily damaged or deformed and it can not effectively support the bone graft material placed on the mesh plate.

In the present invention, the fixing screw can be manufactured by applying a mini-screw used for a finger, a face, a jawbone, etc., and the diameter of the fixing screw is preferably equal to the size of the mesh plate hole. The length of the set screw is 4 mm, 2 to 4 mm, 3 to 4 mm, or 3.5 to 4.5 mm in consideration of the depth of the posterior vertebrae, and a suitable length to firmly fix the mesh plate without causing nerve damage under the vertebra bone .

The number of fixation screws required at least two to fix the mesh plate in contact with the upper and lower hindlimbs of the bone tissue removed from the decompression of the spine, and the amount and shape of the bone graft, Depending on the stability after application, it can be used as many as necessary in various places.

1: back bone of spine
11: Mesh plate
12: Hole in mesh plate
13: Mesh plate fixing screw
14: metal bar
15: Spinal fixation metal screw

Claims (6)

As a back mesh of the vertebrae for union of the upper and lower vertebrae of the lesion removed from the posterior decompression of the vertebrae,
An elastically deformable mesh plate having a plurality of holes formed therein; And
And a mesh plate fixing screw inserted into the remaining vertebrae after the lesion is removed in the hole and spinal decompression of the mesh plate to fix the mesh plate,
The size of the hole increases to a certain distance from the center of the mesh plate to the outside, is uniform from a certain distance,
Wherein the mesh is independently positioned between a spinal fixation screw and a steel bar that fixes the remaining vertebrae after removal of a lesion in the spinal fusion after posterior decompression of the vertebra.
delete The method according to claim 1,
The mesh plate is a bone bed foundation on which the bone graft material can be placed.
The method according to claim 1,
The hole in the mesh plate is 1 to 5 mm in diameter.
The method according to claim 1,
Wherein the mesh plate has a thickness of 0.10 mm to 0.15 mm.
The method according to claim 1,
The mesh plate may be formed of a material selected from the group consisting of titanium, polymethyl methacrylate, polyurethane, polyamides, polytetrafluoroethylene, polydimethyl siloxane, silicone, It is made up of polysulfone, polyacetal, polycarbonate, polypropylene, stainless steel, alumina, hydroxyapatite and zirxonia. A spinal rear mesh that can be manufactured from materials selected from.

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