Expansion type interbody fusion cage

Abstract

The invention relates to an expansion type interbody fusion cage. The expansion type interbody fusion cage comprises a rectangular frame, wherein an upper cover plate with an upper window is installed at the top of the frame, and a lower cover plate with a lower window is installed at the bottom of the frame; an n-shaped upper expansion plate and an n-shaped lower expansion plate are arranged in the frame, the middle of the upper expansion plate falls into the upper window, the width of the upper window is greater than that of the middle of the upper expansion plate and less than the distance between the outer side edges of a left upper folded plate and a right upper folded plate of the upper window, the middle of the lower expansion plate falls into the lower window, the width of the lower window is greater than that of the middle of the lower expansion plate and less than the distance between the outer side edges of the left lower folded plate and the right lower folded plate; and a back-up roll which can be rotationally adjusted from the outside of the frame and has an oval section is mounted in the middle of an inner cavity of the frame, and the surface of the back-up roll is in contact with the inner walls of the upper expansion plate and the lower expansion plate. The expansion type interbody fusion cage can better adapt to the angles of cartilage end plates on the two sides, the contact area between the device and the cartilage end plates is larger after the device is fully expanded, and stability is improved.

Description

technical field

[0001] The invention belongs to the technical field of medical supplies, in particular to an expandable intervertebral fusion device. Background technique

[0002] Spinal fusion is one of the important methods for the treatment of spinal diseases. It treats spinal instability and slippage caused by degenerative changes, trauma and other reasons through surgery, and rebuilds the mechanics of the spine by forming bony fusion of the local upper and lower segments. stability. Intervertebral fusion includes autologous bone graft fusion and allograft bone graft fusion. The clinical application of autologous bone graft in intervertebral fusion is limited due to the limited source of autologous bone, increased donor site trauma, and inability to provide immediate mechanical stability. Allograft bone transplantation is not only expensive and limited in quantity, but also the virus transmission and immune rejection caused by allograft bone are the main reasons that af...

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