Patent ID: 11931078
Assignee: ANZA INNOVATIONS, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 18:
19. A polyaxial spinal anchor assembly comprising:
a bone anchor having a first end comprising a head having a spherical surface and a first keyed contour in at least one plane, a second end, and a neck extending from the head toward the second end, the neck having a diameter less than a diameter of the head; and
a receiver having a base comprising a first end, a second end, an outer surface, an inner surface defining a volume configured to receive and articulate the head, and an opening having a second keyed contour configured to engage and disengage with the head of the bone anchor wherein the second keyed contour is configured to prevent translation-only insertion of the head into the volume from any initial angular orientation of the bone anchor relative to the receiver;
wherein the opening permits insertion of the head into the volume upon at least rotation of the first keyed contour with respect to the second keyed contour in a first rotation direction; and
wherein subsequent rotation of the first keyed contour with respect to the second keyed contour in a second rotation direction different from the first rotation direction maneuvers the bone anchor into a working orientation coaxial with the receiver.