Expandable and adjustable lordosis interbody fusion system

A spinal surgical device for placement between vertebral bodies, the device comprising:

• a housing;
• at least one screw member in the housing, the at least one screw member having a through-opening;
• and
• at least one drive shaft having a length spanning substantially from a first end to a second end of the housing, the at least one drive shaft being adapted to pass through the through-opening in the at least one screw member;
• wherein
• the housing comprises a first shell member and a second shell member, at least the first shell member having at least one riser member for receiving the at least one screw member,
• the at least one drive shaft is configured to rotate the at least one screw member, allowing the at least one screw member to rotate with and travel along the at least one drive shaft,
• the at least one screw member comprises a thread and a root surface having a varying minor diameter, the at least one riser member being engageable with the root surface of the at least one screw member, thereby rotation of the at least one screw member causes the first shell member and second shell member to move relative to each other to effect expansion or contraction of the housing.

A spinal surgical device for placement between vertebral bodies, the device comprising:

• a housing comprising a first shell member and a second shell member, at least the first shell member having a series of riser members;
• at least one screw member to be received by the series of riser members, the at least one screw member having a through-opening;
• and
• at least one drive shaft having a length spanning substantially from a first end to a second end of the housing, the at least one drive shaft being adapted to pass through the through-opening in the at least one screw member and configured to rotate the at least one screw member, the rotation of the at least one screw member causing the at least one screw member to move on the series of riser members, thereby moving the first shell member and second shell member relative to each other to effect expansion or contraction of the housing;
• wherein
• the at least one screw member is configured to remain locked in place under a compressive load or zero load environment at any location along the series of riser members after the first shell member and the second shell member have moved relative to each other to effect expansion or contraction of the housing.

A spinal surgical system comprising:

• an implant device and an operating instrument operable to place the implant device between vertebral bodies, wherein the implant device comprises:
• a housing;
• at least one first screw member positioned along a first lateral area of the housing, and at least one second screw member positioned along a second lateral area of the housing, the at least one first and the at least one second screw members each having a through-opening;
• a first drive shaft and a second drive shaft, the first and the second drive shafts having a length spanning substantially from a first end to a second end of the housing, the first drive shaft being adapted to pass through the through-opening in the at least one first screw member, and the second drive shaft being adapted to pass through the through-opening in the at least one second screw member;
• wherein
• the housing comprises a first shell member and a second shell member, at least the first shell member having at least one first riser member for receiving the at least one first screw member, and having at least one second riser member for receiving the at least one second screw member,
• the first drive shaft, positioned along the first lateral area of the housing, is operable to rotate the at least one first screw member whereby the at least one first screw member rotates with and travels along the first drive shaft, the second drive shaft, positioned along the second lateral area of the housing, is operable to rotate the at least one second screw member whereby the at least one second screw member rotates with and travels along the second drive shaft, thereby rotation of the at least one first screw member and the at least one second screw member causes the first shell member and second shell member to move relative to each other to effect expansion or contraction of the housing, and
• wherein the operating instrument comprises a first torque shaft and a second torque shaft for respective operative engagement with the first drive shaft and the second drive shaft of the implant device, the first and second torque shafts of the operating instrument and the first and second drive shafts of the implant device being configured to generate a distraction force sufficient to overcome a compressive force formed between the vertebral bodies on an anterior side and a posterior side of the vertebral bodies, either simultaneously or independently, to achieve a disc height restoration between the vertebral bodies, and/or an added lordosis, and/or an indirect posterior decompression.