Expanding interbody implant and method

A device to space apart vertebral members, the device comprising:

• a core extending along a longitudinal axis between opposite proximal and distal ends, the core defining a first female thread;
• a drive screw including opposite first and second ends, the first end including a first male thread, the second end including a second male thread, the second male thread engaging the first female thread;
• a first body comprising a second female thread, the first body being coupled to the first end such that the first male thread engages the second female thread;
• a second body coupled to the drive screw;
• a first plate coupled to the core and the first body, the first plate comprising a first vertebral engaging surface;
• and
• a second plate coupled to the core, the second plate comprising a second vertebral engaging surface,
• wherein the drive screw is configured to rotate relative to the core to simultaneously pivot the first plate relative to the core and alter a distance between the first vertebral engaging surface and the second vertebral engaging surface, and
• wherein the first female thread has a major diameter that is less than a major diameter of the second female thread.

A device to space apart vertebral members, the device comprising:

• a core extending along a longitudinal axis between opposite proximal and distal ends, the core defining a first female thread;
• a drive screw including opposite first and second ends, the first end including a first male thread, the second end including a second male thread, the second male thread engaging the first female thread;
• a first body comprising a second female thread, the first body being coupled to the first end such that the first male thread engages the second female thread;
• a second body coupled to the drive screw;
• a first plate coupled to the core and the first body, the first plate comprising a first vertebral engaging surface;
• and
• a second plate coupled to the core, the second plate comprising a second vertebral engaging surface,
• wherein the drive screw is configured to rotate relative to the core to simultaneously pivot the first plate relative to the core and alter a distance between the first vertebral engaging surface and the second vertebral engaging surface, and
• wherein the drive screw includes an unthreaded portion between the first male thread and the second male thread, the unthreaded portion being positioned in an opening of the second body such that the drive screw is rotatable relative to the second body and translation of the drive screw along the longitudinal axis translates the second body along the longitudinal axis.