fuser

Abstract

The invention provides a fusion device for lumbar spondylolisthesis intervertebral correction and restoration. The fusion device comprises a power rod and an end plate, wherein the power rod comprises a first external threaded section and a second external threaded section; the first external threaded section and the second external threaded section are sequentially connected and have opposite screw thread screwing directions; the end plate sleeves the power rod in a matched way, and is positioned between the first external threaded section and the second external threaded section; a first support block is screwed outside the first external threaded section; a second support block is screwed outside the second external threaded section; one side of the end plate is hinged to at least one first support plate; the other side of the end plate is hinged to at least one second support plate; when the power rod rotates relative to the end plate, the first support block and the second support block can move in a direction approaching to the end plate, so that the first support plate and the second support plate can be stretched. The fusion device for lumbar spondylolisthesis intervertebral correction and restoration has the advantages that the size can be increased after the fusion device smoothly enters a regression narrow intervertebral space; the regression narrow intervertebral space can be effectively supported; a correcting force for resisting the transverse slide moving of upper and lower vertebral bodies is generated; restoration is promoted.

Description

technical field [0001] The invention relates to a medical device for intervertebral bone graft fusion, in particular to a lumbar spondylolisthesis intervertebral correction and reduction fusion device for directly correcting and restoring the spondylolisthesis in the intervertebral space. Background technique [0002] Spondylolisthesis (Spondylolysis) or spondylolisthesis (Spondylolisthesis) is a large group of common but refractory diseases in spinal degenerative diseases, especially lumbar degenerative diseases. In the process of life metabolism, the spine will inevitably degenerate. In individuals with large physiological lordosis of the lumbar spine, especially obese and heavy individuals, when the degenerated lumbar intervertebral space becomes unstable and narrowed, the intervertebral joints (intervertebral discs) will inevitably loosen. When the looseness is not enough to resist the shear force of the physiological lordotic curvature of the lower back, it will inevit...

AI Technical Summary

Problems solved by technology

Therefore, at least four pedicle screws had to be added to reinforce the upper and lower vertebral bodies, which not only did not reduce the time and difficulty of the operation, but also further increased the economic cost due to the need to implant fusion cages in addition to implanting screws

At the same time, due to the small area and strong pressure, the complications of subsidence and dislocation are still unavoidable

The most helpless problem is: Although the fusion cage has entered the origin of the axis of the sliding force, so far, there is no fusion cage that has the ability to stand alone when the invertebrate pedicle screw is pulled back. , directly, generate a strong repositioning force that continues to oppose it at the origin of the slipping force, resetting and anchoring the slipped vertebral body, therefore, it is still an unsatisfactory problem in the field of spinal surgery

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