Expandable interbody fusion cage

Abstract

The invention discloses an expandable interbody fusion cage. The expandable interbody fusion cage comprises an outer shell formed by splicing two expansion blocks (1), and is characterized in that the outer shell is of a cavity structure (2), a guide stent (3) and a limiting stent (4) are arranged in the outer shell, the upper end of the limiting stent (4) is arranged at the upper portion of an inner frame of the guide stent (3) and connected with the guide stent (3) through a screw (5), the middle of the limiting stent (4) is attached to the guide stent (3) through staggered slopes (6) on two sides, and the lower portion of the guide stent (3) is fixed to the lower portion of an inner frame of the limiting stent (4). The guide stent and the limiting stent move relatively in the mode that the screw is screwed into the outer shell, the outer shell is propped open and plays a role in expansion, medical staff can adjust the expansion height at will according to interbody conditions of a patient, and a good expansion effect can be achieved.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to an expandable intervertebral fusion device. Background technique [0002] Autologous bone grafting has always been regarded as the gold standard for spinal intervertebral fusion, but there are many complications. In addition to pain and infection in the donor area, the bone graft often slips and prolapses, or collapses due to insufficient strength. When the amount of bone graft is insufficient, it will cause the failure of intervertebral bone graft fusion, resulting in the failure of spinal fusion surgery. Since the fusion device technology was created in the 1980s, due to its advantages of immediate support and prevention of bone graft displacement, the fusion device was quickly accepted and promoted by clinicians. [0003] The current fusion cages are all fixed models. Due to the differences in the size of the spinal structure and surgical wounds of different bone graft patien...

AI Technical Summary

Problems solved by technology

[0003] The current fusion cages are all fixed models. Due to the differences in the size of the spinal structures and surgical wounds of different bone graft patients, doctors often need to determine the type of fusion cages to be implanted through trial models during the operation, but this is often the case. Cannot meet the fusion cage model that best fits the intervertebral space

At the same time, the current fusion cage surface only provides mechanical physical support, and cannot induce osteogenic ingrowth

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