Expandable spinal fusion implant, related instruments and methods

An inserter for inserting an intervertebral spacer into an intervertebral disc space, the inserter comprising:

• a control frame comprising:
• an elongated body comprising an interior wall defining a central working aperture sized for gliding passage of a fixation tube and an expansion rod and an outer wall extending from a distal end of the elongated body having a rectangular profile;
• one or more control arms extending from the distal end of the elongated body, wherein the one or more control arms are configured to be received by an intervertebral spacer and the one or more control arms are configured to transmit a torsional force to the intervertebral spacer;
• a counter-torque neck positioned at a proximal end of the elongated body and configured to reside above the skin when the intervertebral spacer is fully inserted, wherein the counter-torque neck is configured to receive a counter-torque instrument;
• a bulb portion proximal to the counter-torque neck, the bulb portion comprising a lock aperture configured to house a lock wheel;
• and
• a collar neck proximal to the bulb portion, the collar neck comprising threads configured to engage with a handle collar,
• a fixation tube configured to be housed within the control frame, the fixation tube comprising:
• a linear elongated body, threads at a distal end configured to engage with the intervertebral spacer, and pin apertures at a proximal end;
• an inner cannula sized to slide into the elongated body of the fixation tube and extend the length of the fixation tube;
• the lock wheel extending radially from the elongated body at the proximal end;
• and
• a plurality of fixation pins extending through the lock wheel and housed in the pin apertures to fix the lock wheel in a predetermined location on the elongated body, wherein the lock wheel is configured to spin freely within the lock aperture of the control frame,
• an expansion rod configured to be housed within the inner cannula of the fixation tube;
• and
• an expansion handle configured to couple to the expansion rod.