| CPC A61F 2/447 (2013.01) [A61F 2/4455 (2013.01); A61F 2002/30537 (2013.01); A61F 2002/3055 (2013.01); A61F 2002/30556 (2013.01); A61F 2002/30579 (2013.01); A61F 2002/449 (2013.01); A61F 2002/4627 (2013.01)] | 18 Claims |
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1. A spinal fixation system comprising:
an expandable intervertebral implant comprising a central drive assembly aligned along a central longitudinal axis of the implant and left and right side assemblies defining opposing lateral sides of the implant,
the central drive assembly including a front plate at a distal end of the implant, an externally threaded central drive screw, a central actuator having a tubular body with a through bore comprising inner threads and a pair of opposed wings, 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 and is threadedly engaged with the inner threads of the tubular body of the central actuator, the central actuator is threadedly engaged with the externally threaded sleeve, and the externally threaded sleeve is retained in the rear plate and threadedly engaged with the drive nut, and the left and right side assemblies each including upper and lower endplates, a side actuator, and a front ramp,
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 central drive screw are independently rotatable such that rotation of the drive nut is configured to expand the implant in width and rotation of the central drive screw is configured to expand the implant in height;
at least one bone fastener; and
at least one spinal rod attachable to the at least one bone fastener.
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