Expandable fusions devices, instruments, and methods thereof

An implantable system comprising:

• an expandable device comprising a first endplate, a second endplate, a body positioned between the first endplate and the second endplate;
• a drive screw and a lock positioned within the body, wherein rotation of the drive screw is configured to increase or decrease a distance between the first endplate and the second endplate, and the lock is configured to stop rotation to the drive screw,
• the drive screw having a head portion and a shaft,
• the lock having a first ring and a second ring connected to the first ring by a strut,
• wherein in a locked position, the second ring of the lock rests in a circumferential groove of the head portion, the first ring of the lock rests on a top face of the head portion and the strut of the lock rests in a notch of the head portion,
• wherein in an unlocked position, the second ring of the lock is translated out of the circumferential groove of the head portion and the strut of the lock is translated out of the notch of the head portion.