Lateral Lumbar Disc Structure to Prevent Implant Dislocation

The patent applies the inversion principle by changing the surgical approach from anterior to lateral. Instead of approaching the vertebral body from the front (anterior approach), the artificial disc is inserted from the side (lateral approach). This reverses the traditional surgical pathway, allowing the anterior longitudinal ligament to remain intact while still achieving successful disc replacement. The lateral approach provides access to the vertebral body without requiring dissection through the anterior abdominal wall and ligamentous structures.

The patent uses the lateral surgical approach as an intermediary method to achieve artificial disc replacement without directly damaging the anterior longitudinal ligament. By introducing a new access route (lateral approach) as a mediator between the surgical goal and tissue preservation, the procedure avoids direct contact with and damage to the anterior longitudinal ligament and surrounding organs while still enabling successful disc implantation.

The patent applies segmentation by dividing the surgical procedure into distinct phases: making a small lateral incision, creating a controlled access path to the vertebral body, and inserting the artificial disc through this limited approach. Instead of making one large incision for complete exposure, the surgery is segmented into targeted steps that provide adequate access while minimizing overall tissue disruption and reducing surgery time.

The patent applies local quality by providing localized exposure of the vertebral body through a small lateral incision rather than a large midline incision. The surgical access is concentrated precisely where needed (laterally at the target vertebral level) while leaving the surrounding anterior structures undisturbed. This localized approach maintains adequate surgical access while significantly reducing overall tissue damage and operative time.

The patent applies inversion by preserving the anterior longitudinal ligament and changing the insertion approach from anterior to lateral. Instead of removing the ligament to facilitate anterior insertion, the approach is reversed: the ligament is kept intact and the disc is inserted through a lateral pathway. This maintains the ligament's stabilizing function while achieving successful disc replacement, preventing both dislocation and excessive force transmission.

The patent applies beforehand cushioning by preserving the anterior longitudinal ligament as a protective structure before disc insertion. The intact ligament acts as a cushioning and stabilizing element that prevents excessive force transmission to the artificial disc and surrounding structures. By maintaining this natural protective barrier prior to surgery, the design prevents postoperative dislocation and reduces stress on the implant.

The patent uses the lateral approach itself as an intermediary pathway that naturally avoids critical structures. By selecting a surgical corridor laterally positioned between the psoas muscle and peritoneum, the approach serves as a mediator route that provides access to the vertebral body without requiring direct manipulation or risk to these structures. The anatomical landmarks in the lateral approach serve as natural guides for maintaining precise surgical path.

The patent applies preliminary action by carefully planning and establishing the lateral surgical path before reaching the vertebral body. The surgical approach is pre-positioned to follow a safe corridor that avoids psoas muscle and peritoneum, with landmarks identified and trajectory established in advance. This preliminary positioning of the surgical path ensures precision is maintained throughout the procedure without requiring complex real-time adjustments.