Patent ID: 7833256

Claim:
An implantable element for use in a bone anchoring element having a shaft, the implantable element comprising: a multi-part piece with at least a rigid cylindrical section and an elastic section as separate members, the elastic section having a first end, a second end opposite to the first end, and a central axis extending from the first end to the second end, the elastic section being configured to be connected with the rigid cylindrical section at one of the first and second ends, wherein the elastic section forms part of the shaft of the bone anchoring element; the elastic section including at least a first helical coil and a second helical coil, the first and second helical coils being arranged coaxially and extending along a same length of the central axis, an inner radius of the first helical coil less than an outer radius of the second helical coil and an outer radius of the first helical coil greater than an inner radius of the second helical coil, each radius measured from the central axis, so that the first helical coil extends at least in a portion in a helical recess of the second helical coil in a direction of the central axis; wherein the first helical coil and the second helical coil rotate in the same direction relative to the central axis; and wherein the helical recess of the second helical coil is defined by a helical space extending along the central axis between adjacent windings of the second helical coil.