Expandable spinal implant

An expandable spinal implant, configured to be inserted between two vertebrae, comprising:

• a flexible body comprising a base portion and a plurality of flexible arms, each of the plurality of flexible arms having a fixed end and a free end opposite to each other, the fixed ends of the plurality of flexible arms connected to the base portion, and the plurality of flexible arms collectively surrounding an installation space;
• an expander component partially disposed in the installation space and exerting pressure on the free ends of the plurality of flexible arms, such that the free ends are moved in directions away from one another;
• a fastener comprising a head portion and a screw portion connected to each other, the head portion and the expander component located on two opposite sides of the base portion, respectively, and the screw portion disposed through the base portion and irremovably screwed into the expander component;
• and
• an anti-reverse mechanism fixed to the base portion, the anti-reverse mechanism and the expander component located on the two opposite sides of the base portion, respectively, and the anti-reverse mechanism blocking one side of the head portion of the fastener located away from the expander component;
• wherein the expander component has a screw hole, the screw hole is located in the base portion, and the screw portion of the fastener is inserted into the screw hole.