Expandable footprint implant

An expandable intervertebral implant comprising:

• a front plate at a front end of the implant and having a central through bore;
• an externally threaded central drive screw having an enlarged head and a threaded shaft positioned through the through bore in the front plate;
• a central actuator having a tubular body with a through bore comprising inner threads and a pair of opposed wings, the externally threaded shaft of the central drive screw threadedly engaged to the inner threads within one end of the through bore of the central actuator;
• a rear plate having a central through bore;
• an externally threaded sleeve positioned through the through bore in the rear plate and threadedly engaged with the inner threads within an opposite end of the through bore of the central actuator;
• a drive nut at a rear end of the implant threadedly engaged with the externally threaded sleeve;
• and
• left and right side assemblies each including upper and lower endplates, a side actuator, and a front ramp, wherein the side actuator and the front ramp are slidably engaged with the upper and lower endplates, the side actuator is slidably engaged with the rear plate and the central actuator, and the front ramp is slidably engaged with the front plate,
• wherein the pair of opposed wings each define a female ramp configured to receive a corresponding male ramp from each side actuator,
• wherein the rear plate includes a pair of female horizontal ramps defined into top and bottom surfaces of the rear plate, and each side actuator includes a pair of horizontal male ramps configured to interface with the respective female horizontal ramps of the rear plate;
• wherein the front plate includes a pair of female horizontal ramps defined into top and bottom surfaces of the front plate, and each front ramp includes a pair of male horizontal ramps configured to interface with the respective female horizontal ramps of the front plate,
• wherein the left and right side assemblies have a laterally collapsed configuration having a first width and a laterally expanded configuration having a second width larger than the first width, and wherein the left and right side assemblies have a vertically collapsed configuration having a first height and a vertically expanded configuration having a second height larger than the first height, and wherein the drive nut and the drive screw are independently rotatable such that rotation of the drive nut expands the implant in width and rotation of the drive screw expands the implant in height.

An expandable intervertebral implant comprising:

• a central drive assembly aligned along a central longitudinal axis of the implant and including a front plate at a distal end of the implant, an externally threaded central drive screw, a central actuator comprising inner threads, an externally threaded sleeve, a rear plate, and a drive nut at a proximal end of the implant, wherein the central drive screw is retained in the front plate, the central actuator is threadedly engaged with the external threads of the central drive screw and the threaded sleeve, and the externally threaded sleeve is retained in the rear plate and threadedly engaged with the drive nut;
• and
• left and right side assemblies each including upper and lower endplates, a side actuator, and a front ramp, wherein the side actuator and the front ramp are slidably engaged with the upper and lower endplates, the side actuator is slidably engaged with the rear plate and the central actuator, and the front ramp is slidably engaged with the front plate,
• wherein the rear plate includes a pair of female horizontal ramps defined into top and bottom surfaces of the rear plate, and each side actuator includes a pair of horizontal male ramps configured to interface with the respective female horizontal ramps of the rear plate;
• wherein the front plate includes a pair of female horizontal ramps defined into top and bottom surfaces of the front plate, and each front ramp includes a pair of male horizontal ramps configured to interface with the respective female horizontal ramps of the front plate,
• wherein the left and right side assemblies have a laterally collapsed configuration having a first width and a laterally expanded configuration having a second width larger than the first width, and wherein the left and right side assemblies have a vertically collapsed configuration having a first height and a vertically expanded configuration having a second height larger than the first height, and wherein the drive nut and the drive screw are independently rotatable such that when rotated, the drive nut controls width expansion of the implant and the drive screw controls height expansion of the implant.