Dual-lead thread drive screw for a lateral expanding coaxial spinal implant

A dual-lead thread drive screw for a lateral expanding coaxial spinal implant system comprising:

• a substantially rectangular bottom endplate having first and second vertical sidewalls, each of said sidewall including a front slot and rear slot angled away from a front end of said bottom endplate;
• a substantially rectangular top endplate having first and second vertical sidewalls, each of said sidewall including a front slot and rear slot angled away from a rear end of said top endplate;
• a frame positionable between said top endplate and said bottom endplate extending around an outer perimeter of said spinal implant, said frame having a front end and a rear end, said front end of said frame including an end cap, said frame having a left arm and a right arm extending between said rear end to said end cap on said front end, said frame rear end including an aperture and a cavity for receiving an adjustment nut;
• a drive screw rotatably formed from a shank insertable into said frame aperture, said drive screw having dual-load threads formed along a first portion and right-hand threads formed along a second portion, said drive screw having a center section positioned between said first and second portions;
• a first actuator threadably attached to said first portion of said drive screw, said first actuator including a forward pin and a rearward pin operatively associated with said slots formed in said first vertical sidewalls of said top and bottom endplates, said first actuator having a left-hand threaded boss for threadably attaching said drive screw;
• a second actuator threadably attached to said second portion of said drive screw, said second actuator including a forward pin and a rearward pin operatively associated with said slots formed in said second vertical sidewalls of said top and bottom endplates;
• an adjustment nut threadably attached to said second portion of said drive screw, said adjustment nut positioned in said cavity of said frame;
• whereby rotation of said adjustment nut moves said first and second actuators in unison, wherein said pins engage said slots to cause equal separation of said bottom and top endplates;
• and
• whereby rotation of said drive screw causes said first and second actuators to cause lateral rotation of said bottom and top endplate.