Expandable Spinal Implant With Deflectable Segment Sequence

The deflectable linkage is divided into multiple segments (first segment, intermediate segment, second segment) connected by pivotal joints. This segmentation allows each segment to move independently, enabling complex motions like tissue distraction and angular correction while maintaining a relatively simple overall structure. The pivotal connections between segments provide the necessary degrees of freedom without requiring complex mechanical assemblies.

The intermediate segment is enlarged specifically at the region where it contacts the tissue or bone, providing a larger contact surface area for effective distraction. This localized enlargement is confined to specific areas rather than the entire segment, allowing the rest of the segment to maintain simple geometric forms that are easy to manufacture. The pivotal joints and connection regions remain relatively simple in geometry.

The expansion function is merged with the deflectable linkage mechanism. The telescopic body is integrated with the segment structure, and the pivotal connections serve dual purposes: enabling deflection of the linkage and facilitating expansion of the implant. This merging eliminates the need for separate expansion mechanisms, reducing overall device complexity while maintaining adjustability.