Posterior Prosthetic Spinal Disc with Articulating Units

The prosthetic disc is divided into multiple articulating units (e.g., two upper units and two lower units) that can move independently relative to each other. This segmentation allows the implant to be inserted through a narrower posterior approach while maintaining the necessary functional volume and providing flexibility to avoid spinal cord contact.

The prosthetic disc incorporates dynamic articulating units with slider plates and flexible members that allow motion and adjustment. This dynamic design enables the disc to adapt its configuration during insertion and operation, reducing bulk during posterior implantation while maintaining functional integrity and safety.

The articulating units are designed with slider plates that move along curved paths, dynamically adjusting the instantaneous axis of rotation (IAR) and center of rotation (COR) to mimic natural spinal motion. This dynamic adaptation prevents facet joint damage while maintaining reasonable structural complexity through standardized unit designs.

The prosthetic disc changes its geometric parameters (IAR and COR positions) dynamically during operation through the motion of articulating units. This allows the device to adapt to different spinal positions and loads, mimicking natural disc behavior without requiring overly complex control mechanisms.

By segmenting the prosthetic disc into multiple smaller articulating units, the overall insertion profile is reduced, allowing posterior access without contacting the spinal cord. The segmented units can be inserted through a narrower corridor while maintaining functional disc volume.

The articulating units incorporate flexible members and thin film-like slider plates that allow the prosthetic disc to bend and conform to the insertion path, enabling posterior approach while avoiding rigid contact with the spinal cord.