Patent ID: 8690930

Claim:
A bone anchor, comprising: a monolithic tubular shaft defining a bore having a first open end and a second open end opposite to the first open end along a longitudinal axis of the shaft, the shaft including a plurality of openings through a tubular wall of the shaft and spaced apart from the first open end and the second open end; a plug member configured to be implanted into a bone with the tubular shaft, wherein the plug member is configured to be inserted into the bore from the first open end and guidable through the bore past at least one of the openings to a first position along the longitudinal axis for closing the bore between the first open end and the second open end while a pathway between the first open end and the at least one of the openings remains open; and wherein when the plug member is in the bore, a first cross section of the plug member transverse to the longitudinal axis is different from a second cross section of the plug member transverse to the longitudinal axis.