Expandable intervertebral fusion cage

An expandable intervertebral fusion cage, comprising:

• two fusion assembly, each comprising a first block, a second block, and an intermediate block, wherein the first block and the second block are each provided with at least one receiving groove, and at least one inclined surface is formed at the bottom of the receiving groove, the intermediate block is installed within the receiving groove of the first block and the second block, and the intermediate block is symmetrically provided with at least one tapered surface that abuts against the inclined surface;
• and
• a control assembly comprising a fixing member, a pressing member, a horizontal adjustment rod, and a vertical adjustment rod, wherein the fixing member is disposed at the front end of the two fusion assembly and positioned between the two first block and the two second block, the pressing member is located at the rear end of the fusion assembly and positioned against the intermediate block, the horizontal adjustment rod passes through and is positioned within the fixing member, and is pivotally connected to two pushing member, the two pushing member being respectively connected to the first block of each fusion assembly, such that rotation of the horizontal adjustment rod controls the pushing member to drive the two fusion assembly in opposite horizontal directions, and one end of the vertical adjustment rod passes through the horizontal adjustment rod and is threadably engaged with the pressing member, while the other end extends beyond the horizontal adjustment rod, such that rotation of the vertical adjustment rod controls the pressing member to move toward the fixing member, and simultaneously drives the intermediate block, causing the tapered surface of the intermediate block to expand the first block and the second block vertically apart.