Radially expandable spinal interbody device and implantation tool

摘要

A radially expandable spinal interbody device for implantation between adjacent vertebrae of a spine is deliverable to an implant area in a radially collapsed state having minimum radial dimensions and once positioned is then radially expandable through and up to maximum radial dimensions. The expanded radially expandable spinal interbody device is configured to closely mimic the anatomical configuration of a vertebral face. The radially expandable spinal interbody device is formed of arced, pivoting linkages that allow transfiguration from the radially collapsed minimum radial dimensions through and up to the radially expanded maximum radial dimensions once deployed at the implant site (i.e. between adjacent vertebrae). The pivoting linkages have ends with locking features that inhibit or prevent overextension of the linkages. In one form of the locking features, one end of the linkage includes lobes that form a pocket while the other end of the linkage includes a projection that is adapted to be received in the pocket of the lobes of an adjacent linkage. A kit is also provided including a tool for the implantation and deployment of the spinal interbody device into an intervertebral space.

主权项

1. A spinal interbody device comprising:
a base link having a first end and a second end, wherein the base link defines a maximum constant length for the spinal interbody device; a linkage comprising:
a first link having a first end and a second end, the first end including a pivot member rotatably and translationally received in the first end of the base link;a second link having a first end rotatably coupled to the second end of the first link and a second end rotatably coupled to the second end of the base link; and an adjustment screw provided in the second end of the base link and configured to engage the second end of the second link to move the linkage between a collapsed position and an expanded position; wherein a maximum height of the spinal interbody device remains constant as the linkage moves between the collapsed position and the expanded position.