Expandable fusion device and method of installation thereof

A locking mechanism for use in an expandable implant comprising:

• a screw comprising a head that includes at least one recess configured and dimensioned on an outer diameter;
• a housing comprising an opening for receiving the screw and one or more recesses extending radially outwardly from the opening, wherein the housing includes an elongated groove;
• a screw lock ring comprising a first protuberance and a second protuberance, wherein the first protuberance is selectively engageable with the at least one recess on the outer diameter of the head, wherein the screw lock ring further includes a spring tail disposed on an end opposing the first protuberance;
• and
• a housing lock ring operatively connected to a part of the opening in the housing and to the screw lock ring to selectively prevent rotation of the screw lock ring and the screw, wherein the housing lock ring comprises a first side that faces away from the head and a plurality of protrusions separated by plurality of slots on a second side opposite the first side,
• wherein the second protuberance is selectively engageable with one of the plurality of slots of the housing lock ring,
• wherein the housing lock ring includes one or more protuberances extending from an outer diameter of the housing lock ring and configured to selectively engage corresponding ones of the one or more recessed of the housing, and
• wherein the spring tail is configured to allow the screw lock ring to translate inside the groove of the housing.