Bone anchoring device for stabilising bone segments and seat part of a bone anchoring device

A bone anchoring device for stabilizing bone segments, the device comprising:

• a bone anchoring element comprising a shank part and a head;
• a receiver part for articulated connection of the bone anchoring element to a rod;
• a securing member;
• the receiver part comprising:
• a first end and a second end opposite the first end;
• a first bore extending from the first end in the direction of the second end and having a section for receiving the head;
• a second bore providing an opening extending from the second end in the direction of the first end for guiding through the shank part;
• a recess extending from the second end in the direction of the first end for forming a channel with a bottom for receiving the rod, the recess forming two open legs;
• two slit-shaped recesses extending from the first end in the direction of the second, each slit-shaped recess located between the two open legs below the channel;
• and
• wherein the securing member is moveable from a first position engaging the two legs and wherein the head is moveable in the receiver part to a second position wherein the securing member moves the two legs apart at the second end to lock the head in the receiver part.