Patent ID: 11911075
Assignee: nan
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 16:
17. A method of assembling a pivotal bone anchor assembly configured to secure an elongate rod to a bone of a patient via a closure top, the method comprising:
positioning a capture portion of a shank into a lower portion of a central bore of a base of a receiver with the shank extending downward through a lower opening, the capture portion having a rounded shape including a partially spherical lower outer surface extending outwardly and upwardly from a neck and a partially spherical upper outer surface at an upper end of the capture portion, the receiver comprising the base defining the lower portion of the central bore centered about a vertical centerline axis and communicating with a bottom surface of the base through the lower opening, and an upper portion with opposed internal surfaces extending between a front face and a back face of the receiver to define a channel configured to receive the elongate rod, the central bore extending upward through the upper portion to a top of the receiver and including a guide and advancement structure adjacent the top of the receiver configured for engagement with the closure top and a lower seating surface adjacent the lower opening of the base configured for pivotal engagement with the lower outer surface of the capture portion in an unlocked configuration prior to the pivotal bone anchor assembly being locked by the closure top, the bottom surface of the base extending perpendicular to the vertical centerline axis, the lower opening including a cut-out portion extending radially outward through the bottom surface of the base and defined in part by at least one downward-facing partially annular planar surface extending perpendicular to the vertical centerline axis of the receiver; and
pivoting the shank relative to the receiver until a neck of the shank is positioned in the cut-out portion of the lower opening so as to provide for increased pivotal angulation of the shank with respect to the receiver in the direction of the cut-out portion, the shank comprising an integral anchor portion opposite the capture portion configured for attachment to the bone and the neck extending between the capture portion and the anchor portion.