Bone anchor for the optimized cement application

A bone anchor for the fixation of bone components and bone fragments, comprising:

• a shaft, a neck area and a head located in proximal direction, and a tip located in distal direction, the bone anchor having a substantially cylindrically shaped hollow chamber extending along the central axis,
• wherein the hollow chamber is adjacent to a transition area located distally from a central plane,
• wherein the transition area is located distally from the central plane, that the transition area has at least in sections an inner diameter and the hollow chamber has at least in sections an opening diameter, and the opening diameter of the hollow chamber is larger than the inner diameter of the distal transition area, and the transition area causes at least one difference in the flow resistance, or pressure difference, or internal friction of the liquid, or volume flow, and this difference is dependent on a flow direction of a liquid,
• wherein the transition area further comprises at least one segment having at least one area element defining the inner opening diameter and at least one area element defining a dam space, and at least one area element generating a dynamic pressure in blocking direction, wherein the area element is arranged at an angle to a vertical of the central axis between −30° and 30°, said area element being planar, concave or convex curved.