A receiving part for connecting a shank of a bone anchoring element to a rod. The receiving part has a first end, a second end and a recess having a substantially U-shaped cross section. The recess extends from the first end in a direction of the second end forming two legs open at the first end. The...http://www.google.com/patents/US20060293666?utm_source=gb-gplus-sharePatent US20060293666 - Receiving part for connecting a shank of a bone anchoring element to a rod and bone anchoring device with such a receiving part