A medical device includes a spinal rod receiving channel disposed within the medical device and a rod retaining set screw, wherein the spinal rod receiving channel includes an upper arc having a first end and second end, a first middle arc connected to the first end of the upper arc, a second middle arc connected to the second end of the upper arc and disposed opposite the first middle arc, connecting slants connected to first and second middle arcs, and a lower arc connected to the connecting slants, and the rod retaining set screw configured to secure a spinal rod disposed in the spinal rod receiving channel into the medical device.