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

1. A receiver part for articulated connection of a bone anchoring element with a rod having a diameter, the bone anchoring element comprising a shank part and a head, a 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;

a securing element; and

two slit-shaped recesses extending from the first end in the direction of the second end, each slit-shaped recess located between the two open legs below the channel;

wherein connecting the securing element in between the two legs moves the legs apart to narrow the two-slit-shaped recesses at the first end.

2. The receiver part of claim 1 , wherein said legs comprise an inner thread and said securing member is an inner screw to be screwed between said legs.

3. The receiver part of claim 1 , wherein said section to receive said head has a shape corresponding to the shape of head to be received.

4. The receiver part of claim 1 , wherein the length of said slit-shaped recesses in the direction of the first end to the second end is dimensioned such that the head can be clamped in the section for receiving the head.

5. The receiver part of claim 1 , further comprising one or more additional slit-shaped recesses extending from the second end in the direction of the first end.

6. The receiver part of claim 1 , wherein the width of the channel corresponds to the diameter of the rod to be inserted.

7. 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.

8. The receiver part of claim 7 , wherein said legs comprise an inner thread and said securing member is an inner screw to be screwed between said legs.

9. The receiver part of claim 7 , wherein said section to receive said head has a shape corresponding to the shape of the head to be received.

10. The receiver part of claim 7 , wherein the length of said slit-shaped recesses in the direction of the first end to the second end is dimensioned such that the head can be clamped in the section for receiving the head.

11. The receiver part of claim 7 , further comprising one or more additional slit-shaped recesses extending from the second end in the direction of the first end.

12. The receiver part of claim 7 , wherein the width of the channel corresponds to or is slightly smaller than the diameter of the rod to be inserted.