Intervertebral filling fusion device

Abstract

The invention discloses an intervertebral filling fusion device which is used for being placed between any two adjacent centrum end plates of a human body lumbar vertebra. The intervertebral filling fusion device is characterized in that a wrapping body filled with padding inside and an annular air bag are included, the annular air bag is placed on the outer periphery of the wrapping body in a sleeved mode and is used for abutting an upper centrum end plate and a lower centrum end plate in a supporting mode and supporting the padding, the top portion and the bottom portion of the padding are attached with the surface of the upper centrum end plate and the surface of the lower centrum end plate respectively, and the padding comes from autogenous bones or allogeneic bones or artificial bones. The top face and the bottom face of the device can be attached with the surface of the upper centrum end plate and the surface of the lower centrum end plate respectively, point contact is changed into face contact, a stable mechanical structure can be formed to support a vertebral column, the device can be completely attached with the upper centrum end plate and the lower centrum end plate, and favorable conditions are created for fusion of a supporting body and vertebral sclerotin.

Description

technical field [0001] The invention relates to an intervertebral filling and fusion device. Background technique [0002] The intervertebral disc between the vertebral endplates of the human spine is a delicate structure that conforms to the mechanical principle. Its central core is a nucleus pulposus with a diameter of about 1.5cm and composed of fluid. It has the ability to deform and can withstand the pressure of the spine; The periphery is composed of multi-layered fibrous rings. The strong structure can maintain the stability of the core. Therefore, the intervertebral disc is the natural buffer body of the human body, which can share the pressure on the spine and avoid spinal injuries. [0003] The human body often causes intervertebral disc herniation due to factors such as carrying heavy objects or improper force, long-term incorrect posture, oppression in the middle and late stages of pregnancy, and gravity impact on the lower back. Herniation of the intervertebral...

AI Technical Summary

Problems solved by technology

[0007] However, the commonality of the above-mentioned existing artificial intervertebral discs or similar fillers is that they are all designed as rigid structures (mostly made of metal or ceramics). body endplate wear

In addition, the upper and lower surfaces of such fillers or supports are flat surfaces with rigidity. The local contact between this kind of surface and the concave part (texture) produced by the bone growth on the surface of the vertebral body endplate is point contact, and the vertebra at the contact part bears The stress in the vertebral body is relatively concentrated, and over time, the filler or support will be partially pressed into the vertebral body endplate, resulting in local bone collapse

For a type of support made of biocompatible materials (such as bone residue and artificial bone material), although long-term contact with the vertebral endplate can also achieve fusion, it is not completely compatible with the surface of the vertebral endplate. Therefore, it is still impossible to ensure that it can really integrate well with the bony surface of the upper and lower vertebral body endplates

[0008] 2) The second category is mainly based on physiological concept design. Its main purpose is to inject autologous bone, allogeneic bone or artificial bone material directly into the intervertebral space for filling. Because of its flexible texture, its advantage is that it can ensure that the filling material is compatible with the upper and lower. The surface of the vertebral body endplate is attached; but the disadvantage is that it lacks strength, cannot form a stable mechanical support structure, and is easy to collapse, so in the end it cannot form excellent conditions for fusion with the spinal bone

Physiological concept devices are usually only regarded as partial solutions, because they are designed to only replace the nucleus or part of the intervertebral disc, so there are defects such as cumbersome operations, high precision requirements, and complicated procedures during actual implantation operations, and cannot Replace the intervertebral disc very well to achieve a fully fused and stable bone mechanical structure, which is different from the concept of using spinal supports to build bone fusion

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