Patent ID: 11969224
Assignee: GLOBUS MEDICAL INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 8:
9. A tracking system for a cranial surgical operation comprising:
a tracker base having a central hub and a plurality of tracking markers spaced from the central hub in a first predetermined pattern for viewing by tracking cameras, the central hub having a single through hole adapted to receive a single bone screw to be threaded into a skull, the single bone screw being the only bone screw required to fix the tracker base to the skull;
a fiducial base adapted to be attached to and detached from the tracker base in only one orientation, the fiducial base having a plurality of radiopaque markers arranged in a second predetermined pattern; and
a navigation system having a plurality of cameras and adapted to register a medical image containing the plurality of radiopaque markers in an imaging space to an optical camera space for tracking based on the tracking markers visible to the plurality of cameras:
wherein the central hub includes an anti-rotation structure adapted to mate with a corresponding structure in the fiducial base to prevent the fiducial base from rotating relative to the tracker base, and
wherein the fiducial base includes:
a ring having the plurality of radiopaque markers embedded therein; and
a bar having the corresponding structure and attached to opposite ends of the ring through a central point of the ring.