Height-adjustable high-stability interbody fusion cage capable of supplementing and pressurizing bone grafting

Abstract

The invention discloses a height-adjustable high-stability interbody fusion cage capable of supplementing and pressuring bone grafting. The height-adjustable high-stability interbody fusion cage comprises a middle frame, a through hole is formed in the rear end of the middle frame, grooves are arranged on the rear end of the middle frame corresponding to the left side and the right side of the through hole, a screw rod is arranged in the through hole in a penetrating mode, the screw rod is axially limited on the through hole through a positioning piece, a sliding block is connected to the endof the screw rod penetrating into the inner side of the middle frame, supporting plates are installed at the upper end and the lower end of the sliding block respectively, and the supporting plates climb or descend through nesting fit between ribs and the guide grooves and the inclined grooves, and threaded holes are arranged in the left side and the right side of the front end of the middle framerespectively, limit pins are arranged on the threaded holes, and a guide wire hole is arranged through the front end of the middle frame corresponding to the position in the axial direction of the screw. According to the height-adjustable structural design of the interbody fusion cage of the invention, through linkage control of the guide pin, the screw rod and the power sliding block, perfect matching of the height of the fusion cage and the height of a physiological intervertebral space is achieved; and the purpose of parallel lifting height of the intervertebral space after implantation isachieved.

Description

technical field [0001] The invention relates to the technical field of fusion devices, in particular to a high-stability intervertebral fusion device capable of supplementing pressurized bone grafts with adjustable height. Background technique [0002] Traditional intervertebral fusion cages do not have the function of height adjustment. Intervertebral fusion cages of different specifications need to be used in different intervertebral space heights. The types are complex, which increases the difficulty of surgery, requires a long operation time, and the operation process is complicated; [0003] The existing intervertebral fusion surgery is suitable for open surgery due to the excessive volume of the intervertebral fusion device. The large volume fusion device damages the original stable structures such as the articular process and the fibrous ring of the intervertebral disc too much, resulting in spinal instability. Finally, a nail rod must be added for fixation, which not...

AI Technical Summary

Problems solved by technology

The disadvantages of this type of expandable fusion cage are: although the main body of this type of fusion cage can adapt to the height or area of ​​the intervertebral space of different segments, the range of distraction height is limited, and the volume is generally large, and it is more generally suitable for open surgery. The volume fusion cage damages the original stable structures such as the articular process and intervertebral disc fibrous ring too much, resulting in spinal instability. After surgery, nail rods must be added for fixation, which not only increases the difficulty of the operation, prolongs the operation time, and increases the operation cost, but also damages the nerve root. There is also a greater chance of injury

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